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Medina Modification Center

(Site Profile/Docket Number 097)

Location: San Antonio, Texas

Also known as: Medina Facility

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 Medina Modification Center.

Class(es) Added to the SEC

  • 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.

    Note: This class was established from Petition 203.

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 203 (Jan 1, 1958 to Dec 31, 1966)

Steps in Petition Process: Petition Details:

Date Received

May 30, 2012

Date Qualified for Evaluation

May 31, 2012

Summary of Information in Petition

Job Titles and/or Job Duties: Workers potentially exposed to radioactive materials while working at the Medina Facility

Period of Employment: January 1, 1958 to December 31, 1966

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

Medina Facility Petition [248 KB (2 pages)]

Federal Register Notice Announcing that a Medina Modification Center SEC Petition has met the Minimum Qualifications for Review and Evaluation

June 12, 2012 [60 KB (2 pages)]

SEC Petition Evaluation Report

June 1, 2012 [416 KB (34 pages)]

Evaluation Report Sent to Board

June 1, 2012

Petition Discussed by the Advisory Board

The petition was discussed by the Advisory Board on June 21, 2012, during its regular meeting.

Advisory Board Recommendation on SEC Petition

June 27, 2012 [465 KB (2 pages)]

HHS Letters to Congress Regarding the SEC Petition

August 23, 2012 [523 KB (10 pages)]

HHS Designation of Additional Members to the SEC


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


Effective Date for the SEC Class

September 22, 2012

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

October 3, 2012 [49 KB (1 page)]

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

September 28, 2012 [32 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

Advisory Board and NIOSH Comments and Discussion Papers on Medina Modification Center

The documents listed under this section were prepared by the Advisory Board on Radiation and Worker Health (or their technical support contractor) or NIOSH. Some of the items listed below are working documents and were developed for discussion purposes only. The documents represent preliminary positions taken on technical issues. Draft, preliminary, interim, and white paper documents are not final positions unless specifically marked as such.

The documents below have been reviewed to identify and redact any information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

Program Evaluation Plans (PEPs) and Program Evaluation Reports (PERs)

NIOSH is committed to applying the best available science in dose reconstructions. In keeping with this commitment, completed cases with probabilities of causation less than 50% are reviewed as relevant new information becomes available. The results of these reviews are described in a Program Evaluation Report (PER). The PER details the effect, if any, of the new information on the completed dose reconstruction. If it appears that the new information may result in an increase in dose for a completed dose reconstruction with a probability of causation of less than 50%, NIOSH is committed to working with the Department of Labor to reopen and rework the dose reconstruction, as appropriate. A Program Evaluation Plan (PEP) describes plans for evaluating specific program details or issues.

  • OCAS-PER-027 Rev-00: Program Evaluation Report: Clarksville and Medina Site Profile – ORAU TBKS-0039 [15 KB (1 page)]

    October 30, 2007

    About this Document: New document to determine which previously completed claims require evaluation for the effect of issuing a revision to the Clarksville TBD.

    Summary: Prior to November 4, 2006, there were 65 Clarksville and Medina claims completed which had a probability of causation below 50%. NIOSH will review these dose reconstructions to determine if the dose assigned in consistent or higher than the issued TBD. NIOSH will provide DOL with the list of 65 claims as well as a determination on each claim as to whether a new Dose Estimate is required. Documentation for each claim not requiring a new dose reconstruction will provide the basis for that determination.

Public Comments on Medina Modification Center Documents

How to Submit Comments

Comments on Medina Modification Center 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 (097) on all comments.

Comments Received

At this time, no comments have been submitted on Medina Modification Center documents.

Document Archive for Medina Modification Center