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S-50 Oak Ridge Thermal Diffusion Plant

(Site Profile/Docket Number 098)

Location: Oak Ridge, Tennessee

Special Exposure Cohort Petition Information

The Special Exposure Cohort (SEC) is a unique category of employees established by The Act (42 CFR Part 83). Claims compensated under the SEC do not have to go through the dose reconstruction process. To qualify for compensation under the SEC, a covered employee must meet specific requirements (e.g., must have at least one of 22 “specified cancers,” and have worked for a specified time period at one of the SEC sites). Classes of employees and work sites can be considered for addition to the SEC through a NIOSH petition process. More information about the Special Exposure Cohort can be found on our Frequently Asked Questions page.

Open/Active SEC Petitions

To date, there are no open/active SEC petitions from S-50 Oak Ridge Thermal Diffusion Plant.

Class(es) Added to the SEC

  • Employees of the DOE 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 working for a number of work days aggregating at least 250 work day 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.

    Note: This class was established from Petition 60

Petitions Qualified for Evaluation

Below is a list of the petitions that qualified for evaluation. Select a petition on the list to view the table for that particular petition.

Petition 60 (Jan 1, 1944 to Dec 31, 1951)

Steps in Petition Process: Petition Details:

Date Received

May 30, 2006

Date Qualified for Evaluation

June 1, 2006

Summary of Information in Petition

Job Titles and/or Job Duties: All workers

Period of Employment: 1944 through 1951

Note: The information above is what qualified for evaluation. During our evaluation of whether dose reconstructions can adequately be completed for the above job titles and period of employment, information may cause NIOSH to change some the dates or job titles/duties. Therefore, as this petition proceeds through the SEC petition process and if an SEC class is proposed, the proposed class may not exactly match the above information.

Copy of the Petition Received

May 30, 2006 [671 KB (1 page)]

Federal Register Notice Announcing that a Revere Copper and Brass SEC Petition has met the Minimum Qualifications for Review and Evaluation

June 26, 2006 [43 KB (1 page)]

SEC Petition Evaluation Report

August 7, 2006 [100 KB (15 pages)]

Evaluation Report Sent to the Advisory Board

August 9, 2006

Petition Discussed by the Advisory Board

The petition was discussed by the Advisory Board on September 21, 2006, during its regular meeting.

Advisory Board Recommendation on SEC Petition

October 11, 2006 [475 KB (2 pages)]

HHS Letters to Congress Regarding the SEC Petition

November 9, 2006 [518 KB (6 pages)]

HHS Designation of Additional Members to the SEC

November 9, 2006 [190 KB (4 pages)]

Federal Register Notice: Designation Regarding a Class of Employees for Addition to the Special Exposure Cohort

December 8, 2006 [645 KB (1 page)]

Note: A “designation” will be published if there is a recommendation to add a class to the SEC. A “determination” will be published if there is a recommendation not to add a class to the SEC.

Effective Date for the SEC Class

December 9, 2006

Federal Register Notice: Final Effect of Determination of a Class of Employees for Addition to the Special Exposure Cohort

December 27, 2006 [43 KB (1 page)]

Letter to DOL Regarding the Addition of a New Class of Employees to the SEC

December 12, 2006 [363 KB (1 page)]

Technical Documents

If the energy employee’s personal radiation information is incomplete, NIOSH will use other sources to estimate the radiation dose. This may involve using technical documents called Site Profiles, Technical Basis Documents, and Technical Information Bulletins.

Site Profile

Public Comments on S-50 Oak Ridge Thermal Diffusion Plant Documents

How to Submit Comments

Comments on S-50 Oak Ridge Thermal Diffusion Plant Documents can be submitted to the NIOSH Docket Officer electronically by email at or printed comments can be mailed to:

NIOSH Docket Office
Robert A. Taft Laboratories, MS-C34
1090 Tusculum Avenue
Cincinnati, OH 45226
Please include the Site Profile/Docket Number (098) on all comments.

Comments Received

At this time, no comments have been submitted on S-50 Oak Ridge Thermal Diffusion Plant documents.