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Special Exposure Cohort Facilities

The Energy Employees Occupational Illness Compensation Program Act (EEOICPA) Special Exposure Cohort (SEC) Facilities

The EEOICPA established a Special Exposure Cohort (SEC) for certain classes of employees. The SEC allows eligible claimants to be compensated without the completion of a NIOSH radiation dose reconstruction or determination of the probability of causation. To qualify for compensation as a member of a SEC class, a covered employee must have at least one of the 22 specified cancers and worked for a specified period at one of the SEC facilities listed below.

The statutory SEC classes describe employees who:
• Worked at gaseous diffusion plants in Paducah, Kentucky, Portsmouth, Ohio, or Oak Ridge, Tennesseefor a total of at least 250 days before February 1, 1992 andwere monitored for radiation exposure with dosimetry badges or had jobs with similar exposures to those monitored

• Worked before January 1, 1974, on Amchitka Island, Alaska and were exposed to radiation related to the Long Shot, Milrow or Cannikin underground nuclear tests

Here is a list of all facilities and the time periods that fall under SEC in order alphabetically:

Allied Chemical Corporation
January 1, 1959 – December 31, 1976
• Atomic Weapons employees who were monitored or should have been monitored for exposure to ionizing radiation while working at the Allied Chemical Corporation Plant in Metropolis, Illinois, from January 1, 1959 through December 31, 1976, and who were employed for a number of work days aggregating at least 250 work days or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

Ames Laboratory
August 13, 1942 – December 31, 1970
• All Department of Energy employee, its predecessor agencies, and its contractors and subcontractors who worked in any area of the Ames Laboratory at Iowa State University, from August 13, 1942 through December 31, 1970, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more classes of employees included in the Special Exposure Cohort.

January 1, 1971 – December 31, 1989
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked in any area of the Ames Laboratory in Ames, Iowa during the period of January 1, 1971 through December 31, 1989, for a number of work days aggregating at least 250 work days, occurring solely under this
employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Area IV of the Santa Susana Field Laboratory
January 1, 1955 – December 31, 1958
• All employees of the Department of Energy (DOE), its predecessor agencies, and its contractors and subcontractors who worked in any area of Area IV of the Santa Susana Field Laboratory for a number of work days aggregating at least 250 work days from January 1, 1955 through December 31, 1958, or in combination with work days within the parameters established for one or more other classes of employees under the SEC.

January 1, 1959 – December 31, 1964
• All employees of the Department of Energy, it predecessor agencies, and their contractors and subcontractors who worked in any area of Area IV of the Santa Susana Field Laboratory from January 1, 1959 through December 31, 1964, for a number of work days aggregating at least 250 work days, occurring either solely this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

January 1, 1965 – December 31, 1988
• All employees of the Department of Energy, its predecessor agencies, and their contractors or subcontractors who worked in any area of Area IV of the Santa Susana Field Laboratory in Ventura County, California from January 1, 1965, through December 31, 1988, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Argonne National Laboratory – West
April 10, 1951 – December 31, 1957
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Argonne National Laboratory-West during the time period from April 10, 1951, through December 31, 1957, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Baker Brothers
June 1, 1943 – December 31, 1944
• All Atomic Weapons Employees who worked at the Baker Brothers site in Toledo, Ohio, during the period from June 1, 1943, through December 31, 1944, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Battelle Laboratories King Avenue
April 16, 1943 – June 30, 1956
• All Atomic Weapons Employees who worked at the King Avenue facility owned by Battelle Laboratories in Columbus, Ohio, during the period from April 16, 1943, through June 30, 1956, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.
July 1, 1956 – December 31, 1970

• All Atomic Weapons Employees who worked at the facility owned by Battelle Laboratories at the King Avenue site in Columbus, OH during the period from July 1, 1956 through December 31, 1970, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Bethlehem Steel Corporation
January 1, 1949 – December 31, 1952
• All Atomic Weapons Employer employees who worked at Bethlehem Steel Corporation facility in Lackawanna, New York from January 1, 1949 through December 31, 1952, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.
Blockson Chemical Company

March 1, 1951 – June 30, 1960
• All Atomic Weapons Employer employees who worked at the Blockson Chemical Company in Joliet, Illinois from March 1, 1951 through June 30, 1960, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees under the Special Exposure Cohort.

Brookhaven National Laboratory
January 1, 1947 – December 31, 1979
• All employees of the Department of Energy, its predecessor agencies, and its contractors or subcontractors who worked at the Brookhaven National Laboratory in Upton, New York, from January 1, 1947 to December 31, 1979, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees under the Special Exposure Cohort.

January 1, 1980 – December 31, 1993
• All employees of the Department of Energy, its predecessor agencies, and its contractors or subcontractors who worked at Brookhaven National Laboratory in Upton, New York, from January 1, 1980 through December 31, 1993, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

BWX Technologies, Inc.
January 1, 1959 – December 31, 1959 and/or January 1, 1968 – December 31, 1972
• All Atomic Weapons Employer employees who worked at the BWX Technologies, Inc., in Lynchburg, Virginia from January 1, 1959 through December 31, 1959; and/or from January 1, 1968 through December 31, 1972, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

January 1, 1985 – November 30, 1994
• All Atomic Weapons Employer employees who worked at the BWX Technologies, Inc., in Lynchburg, Virginia, during the period from January 1, 1985 through November 30, 1994, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Canoga Avenue
January 1, 1955 – December 31, 1960
• All employees of the Department of Energy, its predecessor agencies, and its contractors and subcontractors who worked at the Canoga Avenue Facility in Los Angeles County, California, from January 1, 1955 through December 31, 1960, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Clarksville Modification Center
August 1, 1949 – December 31, 1967
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors, who worked at the Clarksville Modification Center, Ft. Campbell, in Clarksville, Tennessee, from August 1, 1949 through December 31, 1967, for a number of work days aggregating at least 250 work days, either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Clinton Engineer Works
Combustion Engineering
January 1, 1965 – December 31, 1972
• Atomic Weapons Employer (AWE) employees who worked at the Combustion Engineering site in Windsor, Connecticut from January 1, 1965 through December 31, 1972, for a number of work days aggregating at least 250 work days or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Connecticut Aircraft Nuclear Engine Laboratory (CANEL)
January 1, 1958 – December 31, 1965
• All employees of the Department of Energy (DOE), its predecessor agencies, or DOE contractors and subcontractors who worked at the Connecticut Aircraft Nuclear Engine Laboratory in Middletown, Connecticut, from January 1, 1958, through December 31, 1965, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.
DeSoto Avenue

January 1, 1959 – December 31, 1964
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the DeSoto Avenue facility in Los Angeles County, California, from January 1, 1959 through December 31, 1964, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Dow Chemical Company
January 1, 1957 – December 31, 1960
• Atomic Weapons Employer (AWE) employees were monitored or should have been monitored for exposure to thorium radionuclides while working at the Dow Chemical Company in Madison, Illinois for a number of work days aggregating at least 250 work days from January 1, 1957 through December 31, 1960, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

October 1, 1947 – June 30, 1957
• All Atomic Weapons Employees who worked for Dow Chemical Company in Pittsburg, California from October 1, 1947 through June 30, 1957 for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Downey Facility
January 1, 1948 – December 31, 1955
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Downey Facility in Los Angeles County, California from January 1, 1948 through December 31, 1955, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Electro Metallurgical
August 13, 1942 – December 13, 1947
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Electro Metallurgical Site in Niagara Falls, New York, from August 13, 1942 through December 31, 1947 for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more classes of employees included in the Special Exposure Cohort.

Feed Material Production Center (Fernald)
January 1, 1951 – December 31, 1983
• All employees of the Feed Materials Production Center (FMPC) in Fernald, Ohio, who were not employed by National Lead of Ohio, NLO, or the Department of Energy or its
predecessor agencies, who worked at FMPC from January 1, 1951, through December 31, 1983, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

January 1, 1954 – December 31, 1967
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Feed Materials Production Center (FMPC) in Fernald, Ohio, from January 1, 1954 through December 31, 1967, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

January 1, 1968 – December 31, 1978
• All employees of DOE, its predecessor agencies, and their contractors, or subcontractors who worked at the Feed Materials Production Center (FMPC) in Fernald, Ohio, from January 1, 1968 through December 31, 1978, for a number of workdays aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

General Atomics
January 1, 1960 – December 31, 1969
• Atomic Weapons Employer (AWE) employees who were monitored or should have been monitored for exposure to ionizing radiation while working at the General Atomics facility in La Jolla, California, at the following locations: Science Laboratories A,B, and C (Building 2); Experimental Building (Building 9); Maintenance (Building 10); Service Building (Building 11); Buildings 21 and 22: Hot Cell Facility (Building 23; Waste Yard (Buildings 25 and 26); Experimental Area (Building 27 and 27-1); LINAC Complex (Building 30); HTGR-TCF (Building 31); Fusion Building (Building 33); Fusion Doublet III (Building 34: SV-A (Building 37); SV-B (Building 39); and SV-D (no building number) for a number of work days aggregating at least 250 work from January 1, 1960 through December 31, 1969, or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

January 1, 1960 – December 31, 1969
• All Atomic Weapons Employees who worked for General Atomics at its facility in La Jolla, California, during the period from January 1, 1960, through December 31, 1969, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters
established for one or more other classes of employees included in the Special Exposure Cohort.

General Electric Co.
January 1, 1961 – June 30, 1970
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the General Electric Co. in Evendale, Ohio, from January 1, 1961 through June 30, 1970, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Grand Junction Facilities
March 23, 1943 – January 31, 1975
• All employees of the Department of Energy, its predecessor agencies, and its contractors and subcontractors who worked at the Grand Junction Operations Office from March 23, 1943 through January 31, 1975, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees under the SEC.

February 1, 1975 – December 31, 1985
• All employees of the Department of Energy, its predecessor agencies, and its contractors and subcontractors who worked at the Grand Junction Facilities site in Grand Junction, Colorado, during the period from February 1, 1975, through December 31, 1985, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Hanford
October 1, 1943 – June 30, 1972
• All employees of the Department of Energy (DOE), its predecessor agencies, and its contractors and subcontractors who worked at the Hanford site in Richland, Washington, from October 1, 1943 through June 30, 1972, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other class of employees in the Special Exposure Cohort.

July 1, 1972 – December 31, 1983
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Hanford Engineer Works in Richland, Washington, from July 1, 1972 through December 31, 1983, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

January 1, 1984 – December 31, 1990
• All employees of Department of Energy contractors and subcontractors (excluding employees of the following Hanford prime contractors during the specified time periods: Battelle Memorial Institute, January 1, 1984 through December 31, 1990; Rockwell Hanford Operations, January 1, 1984 through June 28, 1987; Boeing Computer Services Richland, January 1, 1984 through June 28, 1987; UNC Nuclear Industries, January 1, 1984 through June 28, 1987; Westinghouse Hanford Company, January 1, 1984 through December 31, 1990; and Hanford Environmental Health Foundation, January 1, 1984 through December 31, 1990) who worked at the Hanford site in Richland, Washington, during the period from January 1, 1984 through December 31, 1990, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Harshaw Harvard-Denison
August 14, 1942 – November 30, 1949
• Atomic Weapons employees who were monitored or should have been monitored while working at the Harshaw Harvard-Denison Plant located at 1000 Harvard Avenue in Cleveland, Ohio from August 14, 1942 through November 30, 1949 and who were employed for a number of work days aggregating at least 250 work days or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

Hood Building
May 9, 1946 – December 31, 1963
• All employees of the DOE, its predecessor agencies, and their contractors and subcontractors who worked in the Hood Building in Cambridge, MA, from May 9, 1946 through December 31, 1963, for a number of work days aggregating at least 250 work days, occurring solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the SEC.

Hooker Electrochemical Corporation
July 1, 1944 – December 31, 1948
• All Atomic Weapons employees who worked at the Hooker Electrochemical Corporation in Niagara Falls, New York during the operational period from July 1, 1944, through December 31, 1948, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Horizons, Inc.
January 1, 1952 – December 31, 1956
• All Atomic Weapons Employer (AWE) employees who worked at the Horizon’s Inc. facility from January 1, 1952 through December 31, 1956 for a number of work days aggregating at least 250 work days occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Idaho National Laboratory
January 1, 1963 – February 28, 1970
• On June 21, 2019, the Secretary of HHS designated the following class for addition to the SEC in a report to Congress: All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Idaho National Laboratory (INL) in Scoville, Idaho, and who were monitored for external radiation at the Idaho Chemical Processing Plant (CPP) (e.g., at least one film badge or TLD dosimeter from CPP) between January 1, 1963, and February 28, 1970, for a number of work days aggregating at least 250 work days, occurring solely under this employment, or in combination with workdays within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

March 1, 1970 – December 31, 1974
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Idaho National Laboratory (INL) in Scoville, Idaho, and were monitored for external radiation at INL (e.g., having at least one film badge or TLD dosimeter) during the period from March 1, 1970 through December 31, 1974, and were employed for a number of work days aggregating at least 250 work days, occurring either solely under employment during the period from March 1, 1970 through December 31, 1974, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

January 1, 1975 – December 31, 1980
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Idaho National Laboratory (INL) in Scoville, Idaho, and who were monitored for external radiation at the Idaho Chemical Processing Plant (CPP) (e.g., at least one film badge or TLD dosimeter from CPP) between January 1, 1975, and December 31, 1980, for a number of work days aggregating at least 250 work days, occurring solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Iowa Ordnance Plant (Iowa Army Ammunition Plant), Line 1
March 1949 – 1974
• Employees of the Department of Energy (DOE) or DOE contractors and subcontractors employed by the Iowa Army Ammunitions Plant, Line 1, during the period from March 1949 through 1974 and who were employed for a number of work days aggregating at least 250 work days either solely under this employment or in combination with work days within the parameters (excluding aggregate work day requirements) established for other classes of employees included in the SEC.

May 1948 – March 1949
• Department of Energy (DOE) employees or DOE contractor or subcontractor employees who worded as radiographers from May 1948 to March 1949 in support of Line 1 operations at the Iowa Army Ammunitions Plant and who were employed for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters (excluding aggregate work day requirements) established for other classes of employees included in the SEC.

Joslyn Manufacturing and Supply Co.
March 1, 1943 – December 31, 1947
• All Atomic Weapons Employees who worked for Joslyn Manufacturing and Supply Company at the covered facility in Fort Wayne, Indiana, from March 1, 1943 through December 31, 1947, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

March 1, 1943 – July 31, 1948
• All Atomic Weapons Employees who worked for Joslyn Manufacturing and Supply Company at the covered facility in Fort Wayne, Indiana, from March 1, 1943 through July 31, 1948, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days
within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Kellex/Pierpont
January 1, 1943 – December 31, 1953
• All Atomic Weapons Employer (AWE) employees who worked at the Kellex/Pierpont facility in Jersey City, New Jersey from January 1, 1943 through December 31, 1953, for a number of work days aggregating at least 250 work days occurring either solely under this employment or in combination with work days within the parameters established for one or more classes of employees in the Special Exposure Cohort.

Lake Ontario Ordnance Works (LOOW)
January 1, 1944 – December31, 1953
• All employees of the Department of Energy (DOE), its predecessor agencies, and DOE contractors and subcontractors who worked at Lake Ontario Ordnance Works for a number of days aggregating at least 250 work days from January 1, 1944 through December 31, 1953, or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

Lawrence Berkeley National Laboratory
August 13, 1942 – December 31, 1961
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Lawrence Berkeley National Laboratory in Berkeley, California, from August 13, 1942 through December 31, 1961, for a number of work days aggregating at least 250 work days, occurring solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Lawrence Livermore National Laboratory
January 1, 1950 – December 31, 1973
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Lawrence Livermore National Laboratory in Livermore, California from January 1, 1950 through December 31, 1973, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

January 1, 1974 – December 31, 1989
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked in any area at the Lawrence Livermore National Laboratory in Livermore, California during the period from January 1, 1974, through December 31, 1989, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Linde Ceramics
October 1, 1942 – October 31, 1947
• Atomic Weapons Employees who worked at the Linde Ceramics Plant from October 1, 1942 through October 31, 1947, and who were employed for a number of work days aggregating at least 250 work days, either solely under this employment or in combination with work days within the parameters (excluding aggregate work day requirements) established for other classes of employees included in the SEC.

November 1, 1947 – December 31, 1953
• All Atomic Weapons Employees who worked in any area at the Linde Ceramics Plant in Tonawanda, New York, from November 1,1947 through December 31, 1953, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the SEC.

January 1, 1954 – December 31, 1969
• All Atomic Weapons Employees who worked at the Linde Ceramics Plant in Tonawanda, New York, from January 1, 1954 through December 31, 1969, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Los Alamos National Laboratory
March 15, 1943 – December 31, 1975
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Los Alamos National Laboratory in Los Alamos, New Mexico from March 15, 1943 through December 31, 1975, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

January 1, 1976 – December 31, 1995
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Los Alamos National Laboratory (LANL) in Los Alamos, New Mexico from January 1, 1976, through December 31, 1995, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Mallinckrodt Chemical Works
1942 – 1948
• Employees of the Department of Energy (DOE) or DOE contractors and subcontractors employed by the Uranium Division of the Mallinckrodt Chemical Works, Destrehan Street Facility during the period from 1942 through 1948 and who were employed for a number of work days aggregating at least 250 work days either solely under this employment or in combination with work days within the parameters (excluding aggregate work day requirements) established for other classes of employees included in the SEC.

1949 – 1957
• Department of Energy (DOE) employees or DOE contractors and subcontractors who worked in the Uranium Division of the Destrehan Street Facility of Mallinckrodt Chemical Works from 1949 to 1957 and who were employed for a number of work days aggregating at least 250 work days, either solely under this employment or in combination with work days within the parameters (excluding aggregate work day requirements) established for other classes of employees included in the SEC.

January 1, 1958 – December 31, 1958
• All employees of DOE, its predecessor agencies, and their contractors and subcontractors who worked in the Uranium Division of the Mallinckrodt Chemical Co., Destrehan Street Plant, in St. Louis, Missouri, from January 1, 1958 to December 31, 1958, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the SEC.

Medina Modification Center
January 1, 1958 – December 31, 1966
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Medina Modification Center in San Antonio, Texas, from January 1, 1958 through December 31, 1966, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Metallurgical Laboratory
August 13, 1942 – June 30, 1946
• All AWE employees who worked at the Metallurgical Laboratory in Chicago, Illinois, from August 13, 1942 through June 30, 1946, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

Metals and Controls Corp.
January 1, 1952 – December 31, 1967
• All Atomic Weapons Employees who worked at Metals and Controls Corp. in Attleboro, MA, from January 1, 1952 to December 31, 1967, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Mound
October 1, 1949 – February 28, 1959
• Employees of the Department of Energy (DOE), its predecessor agencies, and DOE contractors and subcontractors who worked in any areas at the Mound Plant site from October 1, 1949 through February 28, 1959, for a number of work days aggregating at least 250 work days or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

March 1, 1959 – March 5, 1980
• All employees of the Department of Energy (DOE), its predecessor agencies, and its contractors and subcontractors who had at least one tritium bioassay sample and worked at the Mound Plant in Miamisburg, Ohio from March 1, 1959 through March 5, 1980, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

September 1, 1972 – December 31, 1972 or January 1, 1975 – December 31, 1976
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Mound Plant in Miamisburg, Ohio, from September 1, 1972, through December 31, 1972, or from January 1, 1975, through December 31, 1976, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Nevada Test Site
January 27, 1951 – December 31, 1962
• Department of Energy (DOE) employees or DOE contractor and subcontractor employees who worked at the Nevada Test Site from January 27, 1951 through December 31, 1962 for a number of work days aggregating at least 250 work days, either solely under this employment or in combination with work days within the parameters (excluding aggregate work day requirements) established for other classes of employees in the SEC, and who were monitored or should have been monitored.

January 1, 1963 – December 31, 1992
• All employees of the Department of Energy, its predecessor agencies, and its contractors and subcontractors who worked at the Nevada Test Site from January 1, 1963 through December 31, 1992, for a number of work days aggregating at least 250 work days, occurring solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.
Norton Company
January 1, 1945 – December 31, 1957
• All AWE employees who worked at Norton Company in Worcester, Massachusetts, from January 1, 1945 through December 31, 1957, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

January 1, 1958 – October 10, 1962
• All Atomic Weapons employees who worked in any building or area at the facility owned by the Norton Co. (or a subsequent owner) in Worcester, Massachusetts, during the period from January 1, 1958 through October 10, 1962, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Nuclear Materials and Equipment Corporation (NUMEC), Park Township
June 1, 1960 – December 31, 1980
• All Atomic Weapons Employer (AWE) employees who worked at Nuclear Materials and Equipment Corporation (NUMEC) facility in Parks Township, Pennsylvania, from June 1, 1960 through December 31, 1980, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Nuclear Materials and Equipment Corporation (NUMEC), Apollo
January 1, 1957 – December 31, 1983
• Atomic Weapons Employer employees who were monitored or should have been monitored for exposure to ionizing radiation while working at the NUMEC in Apollo, Pennsylvania from January 1, 1957 through December 31, 1983, for a number of work days aggregating at least 250 work days or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

Nuclear Metals, Inc.
October 29, 1958 – December 31, 1979
• All Atomic Weapons Employees who worked at the facility owned by Nuclear Metals, Inc. (or a subsequent owner) in West Concord, Massachusetts, during the period from October 29, 1958, through December 31, 1979, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

January 1, 1980 – December 31, 1990
• All Atomic Weapons Employees who worked at the facility owned by Nuclear Metals, Inc. (or a subsequent owner) in West Concord, Massachusetts, during the period from January 1, 1980, through December 31, 1990, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Oak Ridge Hospital
May 15, 1950 – December 31, 1959
• All employees of the Department of Energy, its predecessor agencies, and its contractors and subcontractors who worked in any location at the Oak Ridge Hospital in Oak Ridge, Tennessee, from May 15, 1950 through December 31, 1959, for a number of work days aggregating at least 250 work days or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

Oak Ridge Institute for Nuclear Studies Cancer Research Hospital (ORINS)
May 15, 1950 – December 31, 1963
• Employees of the Department of Energy predecessor agencies and their contractors and subcontractors who were monitored or should have been monitored while working at the Oak Ridge Institute for Nuclear Studies Research Hospital from May 15, 1950 through December 31, 1963, and who were employed for a number of work days aggregating at least 250 work days, or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

Oak Ridge National Laboratory (X-10)
June 17, 1943 – July 31, 1955
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked in any area at the Oak Ridge National Laboratory (X-10) in Oak Ridge, Tennessee, from June 17, 1943, through July 31, 1955, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Pacific Proving Grounds
1946 – 1962
• Department of Energy (DOE) employees or DOE contractor or subcontractor employees who worked at the Pacific Proving Grounds (PPG) from 1946 through 1962 for a number of work days aggregating at least 250 work days, either solely under this employment or in combination with work days within the parameters (excluding aggregate work day requirements) established for other classes of employees included in the SEC, who were monitored or should have been monitored.

Pantex
January 1, 1951 – December 31, 1957
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Pantex Plant in Amarillo, Texas, during the period from January 1,1951 through December 31, 1957.

January 1, 1958 – December 31, 1983
• All employees of the Department of Energy, its predecessor agencies, and their contractors or subcontractors who worked at the Pantex Plant in Amarillo, Texas, during the period from January 1, 1958 through December 31, 1983, for a number of work days aggregating at least 250 work days, occurring either solely under this
employment or in combination with work days within the parameters established for one or more other classes of employees included in the SEC.

January 1, 1984 – December 31, 1991
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Pantex Plant in Amarillo, Texas, from January 1, 1984 through December 31, 1991, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Piqua Organic Moderated Reactor Site
May 2, 1966 – February 28, 1969
• All employees of the Department of Energy, its predecessor agencies, and its contractors and subcontractors who worked at the Piqua Organic Moderated Reactor Site during the covered period from May 2, 1966 through February 28, 1969, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

Revere Copper and Brass
July 24, 1943 – December 31, 1954
• All Atomic Weapons Employer employees who worked at the Revere Copper and Brass in Detroit, Michigan, from July 24, 1943 through December 31, 1954, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Rocky Flats
April 1, 1952 – December 31, 1958 and/or January 1, 1959 – December 31, 1966
• Employees of the Department of Energy (DOE), its predecessor agencies, or DOE contractors or subcontractors who were monitored or should have been monitored for neutron exposures while working at the Rocky Flats Plant in Golden, Colorado, for a number of work days aggregating at least 250 work days from April 1, 1952 through December 31, 1958 and/or January 1, 1959 through December 31, 1966, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

April 1, 1952 – December 31, 1983
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Rocky Flats Plant in Golden, Colorado, from April 1, 1952, through December 31, 1983, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

S-50 Oak Ridge Thermal Diffusion Plant
July 9, 1944 – December 31, 1951
• Employees of the Department of Energy predecessor agencies and their contractors and subcontractors who were monitored or should have been monitored while working at the S-50 Oak Ridge Thermal Diffusion Plant for a number of work days aggregating at least 250 work days during the period from July 9, 1944 through December 31, 1951, or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

SAM (Special Alloyed or Substitute Alloy Materials) Laboratories of Columbia University
August 13, 1942 – December 31, 1947
• All Employees of the Department of Energy (DOE), its predecessor agencies, and DOE contractors and subcontractors who worked in the Pupin, Schemerhorn, Havenmeyer, Nash, or Prentiss buildings at SAM (Special Alloyed or Substitute Alloy Materials) Laboratories of Columbia University in New York City, New York, from August 13, 1942 through December 31, 1947, for a number of work days aggregating at least 250 work days occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Sandia National Laboratories
January 1, 1949 – December 31, 1962
• All employees of the Department of Energy, its predecessor agencies, and its contractors and subcontractors who worked in any area at Sandia National Laboratories in Albuquerque, New Mexico from January 1, 1949 through December 31, 1962, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

January 1, 1963 – December 31, 1994
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked in any area of the Sandia National
Laboratories in Albuquerque, New Mexico, from January 1, 1963 through December 31, 1994, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

January 1, 1995 – December 31, 1996
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked in any area of the Sandia National Laboratories in Albuquerque, New Mexico, during the period from January 1, 1995 through December 31, 1996, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Sandia National Laboratories-Livermore
October 1, 1957, through December 31, 1994
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked in any area of the Sandia National Laboratories-Livermore in Livermore, California, from October 1, 1957, through December 31, 1994, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Savannah River
January 1, 1953 – September 30, 1972
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Savannah River Site from January 1, 1953 through September 30, 1972 for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Simonds Saw and Steel Company
January 1, 1948 – December 31, 1957
• All Atomic Weapons Employer employees who worked at Simonds Saw and Steel Company from January 1, 1948 through December 31, 1957, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Spencer Chemical Company/Jayhawk Works
January 1, 1956 – December 31, 1961
• All Atomic Weapons Employer (AWE) employees who were at Spencer Chemical Company/Jayhawk Works near Pittsburg, Kansas, from January 1, 1956 through December 31, 1961, for an aggregate of at least 250 work days occurring either solely under this employment or in combination with work days within the parameters established for one or more classes of employees in the Special Exposure Cohort.
Standard Oil Development Company

August 13, 1942 – December 31, 1945
• All employees of Standard Oil Development Company in Linden, New Jersey, during the period from August 13, 1942 through December 31, 1945, and were monitored, or should have been monitored, for exposure to ionizing radiation while working for a number of work days aggregating at least 250 work days, either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

St. Louis Airport Storage
January 3, 1947 – November 2, 1971
• All employees of the Department of Energy, its predecessor agencies, and its contractors and subcontractors who worked in any area and in any job capacity at the St. Louis Airport Storage Site in St. Louis, Missouri from January 3, 1947 through November 2, 1971, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Texas City Chemicals, Inc.
October 5, 1953 – September 30, 1955
• All Atomic Weapons Employer employees who worked at Texas City Chemicals, Inc., from October 5, 1953, through September 30, 1955, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Tyson Valley Powder Farm
February 13, 1946 – June 30, 1948
• All Atomic Weapons Employer (AWE) employees who worked at Tyson Valley Powder Farm near Eureka, Missouri, from February 13, 1946 through June 30, 1948, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

University of Rochester Atomic Energy Project
September 1, 1943 – October 30, 1971
• All employees of the Department of Energy, its predecessor agencies, and its contractors and subcontractors who worked at the University of Rochester Atomic Energy Project in Rochester, New York, from September 1, 1943 through October 30, 1971, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.
Ventron Corporation

November 1, 1942 – December 31, 1948
• All Atomic Weapons Employees who worked for the Ventron Corporation at its facility in Beverly, Massachusetts, from November 1, 1942 through December 31, 1948, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more classes of employees included in the Special Exposure Cohort.

Vitro Manufacturing
August 13, 1942 – December 31, 1957
• All AWE employees who worked at Vitro Manufacturing in Canonsburg, Pennsylvania, from August 13, 1942 through December 31, 1957, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

January 1, 1958 – December 31, 1959
• All Atomic Weapons Employer employees who worked at Vitro Manufacturing in Canonsburg, Pennsylvania, from January 1, 1958 through December 31, 1959, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

January 1, 1960 – September 30, 1965
• All Atomic Weapons Employees who worked at Vitro Manufacturing in Canonsburg, Pennsylvania, from January 1, 1960 through September 30, 1965, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Wah Chang
January 1, 1971 – December 31, 1972
• All Atomic Weapon Employer employees who worked in any building at the Wah Chang facility in Albany, Oregon, for the operational period from January 1, 1971 through December 31, 1972, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

West Valley Demonstration Project
January 1, 1969 – December 31, 1973
• On October 25, 2019, the Secretary of HHS designated the following class for addition to the SEC in a report to Congress: All atomic weapons employees who worked at the West Valley Demonstration Project in West Valley, New York, during the period from January 1, 1969, through December 31, 1973, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Westinghouse Atomic Power Development Plant
August 13, 1942 – December 31, 1944
• All Atomic Weapons Employer (AWE) employees who worked at Westinghouse Atomic Power Development Plant in East Pittsburgh, Pennsylvania, from August 13, 1942 through December 31, 1944, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

Westinghouse Electric Corp.
August 13, 1942 – December 31, 1949
• All Atomic Weapons Employer employees who worked at Westinghouse Electric Corp., Bloomfield, New Jersey, from August 13, 1942 through December 31, 1949, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

February 1, 1958 – May 31, 1958 or June 1, 1959 through June 30, 1959
• All Atomic Weapons Employees who worked at the facility owned by Westinghouse Electric Corp. in Bloomfield, New Jersey, during the period from February 1, 1958 through May 31, 1958, or during the period from June 1, 1959 through June 30, 1959, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Winchester Engineering and Analytical Center
January 1, 1952 – December 31, 1961
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Winchester Engineering and Analytical Center in Winchester, Massachusetts, from January 1, 1952 through December 31, 1961, for a number of work days aggregating at least 250 work days, occurring solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

W.R. Grace, Erwin, Tennessee
January 1, 1958 – December 31, 1970
• Atomic Weapons Employer (AWE) employees who were monitored or should have been monitored for potential exposure to thorium while working in any of the 100 series buildings or Buildings 220, 230, 233, 234, 301 or 310 at the W.R. Grace site at Erwin, Tennessee for a number of work days aggregating at least 250 work days from January 1, 1958 through December 31, 1970, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

W.R. Grace, Curtis Bay, Maryland
May 1, 1956 – January 31, 1958
• All Atomic Weapons Employees who worked in any building or area at the facility owned by W.R. Grace and Co. in Curtis Bay, Maryland, for the operational period from May 1, 1956 through January 31, 1958, for a number of work days aggregating at least 250
work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

Y-12
March 1, 1943 – December 31, 1947
• All employees of the Department of Energy (DOE), its predecessor agencies, and DOE contractors and subcontractors who worked at the Y-12 Plant in Oak Ridge, Tennessee from March 1, 1943 through December 31, 1947 for a number of work days aggregating at least 250 work days occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

January 1, 1948 – December 31, 1957
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Y-12 facility in Oak Ridge, Tennessee, from January 1, 1948 through December 31, 1957, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.

January 1, 1958 – December 31, 1976
• All employees of the Department of Energy, its predecessor agencies, and their contractors and subcontractors who worked at the Y-12 Plant in Oak Ridge, Tennessee, during the period January 1, 1958, through December 31, 1976, for a number of work days aggregating at least 250 work days, occurring either solely under this employment or in combination with work days within the parameters established for one or more other classes of employees in the Special Exposure Cohort.