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Weldon Spring Plant

(Site Profile/Docket Number 53)

Location: Weldon Spring, Missouri

Also known as: Mallinckrodt, Weldon Spring Chemical Co., Weldon Spring Site Remedial Action Project (WSSRAP), WSS

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

There are currently no open/active petitions from Weldon Spring Plant.

Classes Not Added to the SEC

  • All employees of the Department of Energy, Department of Energy contractors, or subcontractors who worked in any area at the Weldon Spring Plant in Weldon Spring, Missouri, during the applicable covered operational period from January 1, 1957, through December 31, 1967

    Note: Note: This class was established from Petition 143

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.

Petitions

Petition 143Jan 1, 1957 to Dec 31, 1966

Petition 143
Steps in Petition Process: Petition Details:

Date Received

April 29, 2009

Date Qualified for Evaluation

September 11, 2009

Summary of Information in Petition

Location: Weldon Spring, Missouri

Job Titles and/or Job Duties: All employees of DOE, DOE contractors, or subcontractors who worked in any area

Period of Employment: January 1, 1957 through 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

April 29, 2009 [5 MB (68 pages)]
(January 1, 1957 through December 31, 1966)

April 29, 2009 [4 MB (72 pages)]
(January 1, 1955 through December 31, 1967)

Federal Register Notice Announcing that a Weldon Spring Plant SEC Petition has met the Minimum Qualifications for Review and Evaluation

September 22, 2009 [40 KB (1 page)]

SEC Petition Evaluation Report

April 21, 2010 [679 KB (92 pages)]

Evaluation Report Sent to the Advisory Board

May 5, 2009

Petition Discussed by the Advisory Board

The Advisory Board discussed the petition on May 20, 2010, May 25, 2011, February 29, 2012, June 19, 2012, and September 19, 2012, during its regular meetings.

Advisory Board Recommendation on SEC Petition

October 31, 2012 [173 KB (1 page)]

HHS Letters to Congress Regarding the SEC Petition

December 7, 2012 [70 KB (9 pages)]

HHS Designation/Determination of Additional Members to the SEC

Determination

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.

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

Determination

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

Not applicable.

Note: this only applies if the class is added to the SEC.

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

Not applicable.

Note: this only applies if the class is added to the SEC.

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

Not applicable.

Note: this only applies if the class is added to the SEC.

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 Weldon Spring Plant:

Advisory Board Work Group on Weldon Spring Plant

This Work Group is responsible for reviewing the Weldon Spring Plant Site Profile, the SEC petition from Weldon Spring Plant petitioners, the NIOSH Evaluation Report of the petition, the SC&A Review of the Weldon Spring Plant Site Profile, considering issues raised by the Board's contractor (SC&A) concerning the Site Profile and the petition Evaluation Report, and for assisting NIOSH and SC&A in the resolution of such issues. The Work Group may recommend to the Board, changes in the Site Profile as appropriate. The Work Group should strive to develop a recommendation to the Board on whether a class should be added to the SEC.

Work Group Members:

  • Richard A. Lemen, Ph.D., M.S.P.H. (Chair)
  • R. William Field, Ph.D., M.S.
  • James Malcolm Melius, M.D., Dr. P.H.

Meeting Information:

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

  • Introduction [99 KB (9 pages)] Revised May 24, 2013

    Revision Includes: Revision implemented according to guidance from ORAUT-PROC-0031, Rev. 04. Section 1.1: Replaced introductory text with updated template language. Added Section 1.1.1, "Purpose," and changed heading from "Site Profile Description" to "Scope" for Section 1.1.2. Minor technical editing conducted for Section 1.2. Deleted repetitious details and results that appear in subsequent sections of the Site Profile from Sections 1.3 through 1.6. Updated the Acronyms and Abbreviations and the References sections. No sections were deleted. No changes occurred as a result of formal internal review. Incorporates formal NIOSH review comments. Constitutes a total rewrite of the document.

  • Site Description [693 KB (44 pages)] Revised May 21, 2013

    Revision Includes: Incorporates data that has been found since the initial draft was issued. Updates description of processed materials and throughputs. No changes occurred as a result of formal internal review. Incorporates formal NIOSH review comments. Constitutes a total rewrite of the document.

  • Occupational Medical Dose [152 KB (12 pages)] Revised January 30, 2013

    Revision Includes: Incorporates historical documents captured since the first revision, to include skin doses for all areas of skin, and to address SC&A comments. Incorporates formal internal and NIOSH review comments. Constitutes a total rewrite of the document.

  • Occupational Environmental Dose [707 KB (35 pages)] Revised May 17, 2013

    Revision Includes: Revises the TBD as a result of completion of Advisory Board Work Group issues. Includes information in Section 4.2.2.1 about the drying of the raffinate pits and its potential for resuspension of pit radionuclide content. Includes factors for calculation of recycled uranium contaminant activity based on ppb or pCi uranium. Revises and implements according to ORAUT-PROC-0031, Rev. 02. Adds a table for maximum sitewide median intake values to comply with PROC-0031, and also adds a table of annual median intake values for the WSCP, WSRP, and WSQ. Replaces introductory text with updated template language in Section 4.1. Revised Section 4.1.1, Purpose, and Section 4.1.2, Scope. Revises Sections 4.2.1 and 4.2.2 to more specifically target the radionuclides of concern and source terms that contribute to 95% of the potential internal dose. Revises the approach to determination of annual intake of radionuclides (Section 4.2.3.1) during the operational period to optimize the use of available site-specific monitoring data. Adds a table of annual median values for occupational external dose to be used as surrogates for onsite ambient dose during the operational period. Adds Section 4.4 as a summary of environmental doses for use by dose reconstructors and provides tabulated inhalation intakes and ambient dose default values. Incorporates formal internal and NIOSH review comments. Constitutes a total rewrite of the document.

  • Occupational Internal Dose [642 KB (60 pages)] Revised May 21, 2013

    Revision Includes: Modifies the indoor radon equilibrium factor from 0.5 to 0.7 to coincide with Advisory Board meeting transcripts from September 19, 2012. This increases the radon intake value from 8.8 WLM/year to 12.4 WLM/year. Changes were made in Section 5.6.1.3 and Table 5-23. No changes occurred as a result of formal internal and NIOSH review.

  • Occupational External Dose [3 MB (45 pages)] Revised February 6, 2013

    Revision Includes: Removes all surrogate data except the data from MCW. Adds new material located since the last revision. Includes a correction factor to account for worker-radiation source geometry to be applied to the measured and missed photon dose for operators, material handlers and trade workers to avoid an underestimate of dose. Organs most affected by this are those in the lower torso (stomach, pancreas, ovaries, etc.). DCAS-TIB-0013 was included as a reference and used to determine this geometric correction factor of 2.1. Incorporates responses and commitments based on SC&A and Advisory Board Working Group issues. Incorporates formal internal and NIOSH review comments. Constitutes a total rewrite of the document.

Advisory Board and NIOSH Comments and Discussion Papers on Weldon Spring Plant

The Weldon Spring Plant discussion papers listed below are working documents prepared by NIOSH or its contractor for use in discussions with the Advisory Board on Radiation and Worker Health or its Working Groups or Subcommittees. Draft, preliminary, interim, and white paper documents are not final NIOSH or Advisory Board (or their technical support and review contractors) positions unless specifically marked as such. These documents represent preliminary positions taken on technical issues prepared by NIOSH or its contractor.

The discussion papers 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.

Public Comments on Weldon Spring Plant Documents

How to Submit Comments

Comments on Weldon Spring Plant Documents can be submitted to the NIOSH Docket Officer electronically by email at nioshdocket@cdc.gov 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 (53) on all comments.

Comments Received

No public comments have been received on Weldon Spring Plant Documents at this time

Document Archive for Weldon Spring Plant

  • Section 1: Introduction section
    • Page Change Revision June 30, 2008 [89 KB (11 pages)]

      Revision Includes: Approves page change revision initiated to eliminate reference to a user's guide on page 10 in Section 1.2, which was never published due to a change in policy. Addsan Attributions and Annotations Section on page 10, updated NIOSH required language on page 5 in Section 1.1, and ORAU team references on pages 8 and 11. Now uses term, "favorable to claimant" on pages 6, 9, and 10 in Sections 1.1 and 1.2. No sections were deleted. Incorporates formal internal review comments. No changes were needed as a result of NIOSH formal review.

    • Approved June 28, 2005 [82 KB (11 pages)]

  • Section 2: Site Description section
  • Section 3: Occupational Medical Dose section
  • Section 4: Occupational Environmental Dose
  • Section 5: Occupational Internal Dose
    • Revised March 15, 2013 [659 KB (60 pages)]

      Revision Includes: Incorporates numerous minor corrections and edits. SRDB numbers and page numbers were added. In Section 5.2.1, the specific activity for slightly enriched (1%) uranium was adjusted to agree with the formula in DOE 2001a. Sections 5.2.2 related to uranium decay products were edited to reflect the fact that the early uranium mills may not have been effective in removing thorium and to increase the amount of Th-230 and daughters to assume in calculations. The maximum concentrations for certain decay products at the WSRP and WSQ were eliminated. A discussion was added in Section 5.2.3 on potential intakes from thoron. Site-specific ratios of Th-230 to other contaminants were developed in Section 5.6.1.1 for use during initial uranium processing. DWA concentrations for thorium dust measurements were added as Attachment A, and these values were used to create a new table of thorium intakes in Section 5.6.1.2. Thoron guidance was also added to this section. A statement was added in Section 5.6.1.1 to use Friday urine sampling data statistics to avoid underestimating intakes. The estimated annual exposure from radon was increased in Section 5.6.1.3, and Section 5.2.4 on recycled uranium was updated in response to issues raised in the Advisory Board Work Group. Thorium-232 intake rates updated to reflect an 8-hour workday normalized to a calendar for each of the years for Th-232 operations, and equations were included in the text regarding calculation of the median and 95th percentiles of the Th-232 intake rates. Incorporates formal internal and NIOSH review comments. Constitutes a total rewrite of the document.

    • Approved June 28, 2005 [506 KB (43 pages)]

  • Section 6: Occupational External Dose section
 
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