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National Institute for Occupational Safety and Health (NIOSH)
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NIOSH Program Area:

Radiation Dose Reconstruction


Medina Modification Center
(Site Profile/Docket Number 097)

Locations: San Antonio, Texas

Also Known As: Medina Facility

Site Profile

Site Profile for Clarksville Modification Center with Supplementary Guidance for the Medina Modification Center
(Revised April 8, 2013)
this document in PDF PDF 1.8 MB (51 pages)

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Technical Information Bulletins (TIBs)

At the current time, there are no TIBs for the Medina Modification Center.

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

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.

  • PER 27: Clarksville and Medina Site Profile - ORAU TBKS-0039
    this document in PDF PDF 15 KB (1 page)

    Document Number: OCAS-PER-027 Rev-00

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

    Approved: October 30, 2007

    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.

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Worker Outreach Activities

Based on a recommendation from the Advisory Board to provide workers and site experts with opportunities to participate in developing the technical documents used in dose reconstruction, NIOSH established a Worker Outreach Program.

At Worker Outreach Meetings, current and former DOE and AWE employees have opportunities to obtain information about Site Profiles, Technical Basis Documents, and Technical Information Bulletins, and to provide information for consideration and possible use in dose reconstruction. This process is valuable to ensure that the technical documents used in dose reconstruction contain correct and useful information.

Below are the Worker Outreach Activities for the Medina Modification Center:

At the current time, worker outreach activities have not been scheduled.

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Advisory Board and NIOSH Comments and Discussion Papers on the 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.

The most recent documents appear at the top of the list.

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Public Comments on Medina Modification Center Documents

How to Submit Comments

Members of the public can provide comments on Medina Modification Center documents. Comments should be submitted to the NIOSH Docket Officer electronically by e-mail 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.

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Special Exposure Cohort Petition Information for the Medina Modification Center

Open/Active SEC Petitions

There are currently no open/active SEC petition(s) from the 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)

Classes Not Added to the SEC

Not applicable at this time.

SEC Petitions Not Qualifying for Evaluation

Not applicable at this time.

Petitions Qualified for Evaluation

To date, one petition from the Medina Modification Center has qualified for evaluation. The left-hand column of the table below shows the various steps in the SEC petitioning process. The right-hand column of the table contains information related to the Medina Modification Center petition.

Petition 203
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 petitioning 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
this document in PDF PDF 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
this document in PDF PDF 60 KB (2 pages)

SEC Petition Evaluation Report

June 1, 2012
this document in PDF PDF 404 KB (34 pages)

Evaluation Report Sent to the Advisory 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.

Note: the agenda for this meeting is available on the Advisory Board and Public Meetings page.

Advisory Board Recommendation on SEC Petition

June 27, 2012
this document in PDF PDF 595 KB (2 pages)

HHS Letters to Congress Regarding the SEC Petition

August 23, 2012
this document in PDF PDF 679 KB (10 pages)

HHS Designation of Additional Members to the SEC

August 23, 2012
this document in PDF PDF 150 KB (5 pages)

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

September 20, 2012
this document in PDF PDF 79 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

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
this document in PDF PDF 77 KB (1 page)

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

September 28, 2012
this document in PDF PDF 35 KB (1 page)

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Previous Versions of Medina Modification Center Documents

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Page last updated: November 27, 2012
Page last reviewed: August 25, 2014
Content Source: National Institute for Occupational Safety and Health (NIOSH) Division of Compensation Analysis and Support