ULNRC-06004, Dose Assessment Capability for Multiple Source Release

Dose Assessment Capability for Multiple Source Release

ML13179A037
Person / Time
Site:	Callaway
Issue date:	06/27/2013
From:	Reasoner C Ameren Missouri
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
ULNRC-06004
Download: ML13179A037 (6)

Text

Cleve Reasoner

~'t. Vice President Engineering WAmeren Ameren Missouri Callaway Plant T 573.676.8241 MISSOURI F 573.676.4056 June 27, 2013 ULNRC-06004 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 10 CFR 50.4 Ladies and Gentlemen:

DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.

FACILITY OPERATING LICENSE NPF-30 DOSE ASSESSMENT CAP ABILITY FOR MULTIPLE SOURCE RELEASES

References:

1. US NRC's Fukushima Near-Term Task Force Report, "Recommendations for Enhancing Reactor Safety in the 21st Century,"

dated July 12,2011 (ADAMS Accession No. ML112510271)

2. Letter dated January 28, 2013, from J. E. Pollok, Nuclear Energy Institute, to J. T. Wiggins, USNRC, "Industry Implementation ofMulti-unit Dose Assessment Capability" (ADAMS Accession No. ML13028A200)

3. Letter dated February 27, 2013 from J. T Wiggins, USNRC, to J. E. Pollok, Nuclear Energy Institute, requesting additional details on multi-unit dose assessment capability (ADAMS Accession No. ML13029A632)

4. Letter dated March 14, 2013 from J. E. Pollok, Nuclear Energy Institute, to J.

T. Wiggins, USNRC, "Commitment for Implementation of Multi-Unit Dose Assessment Capability," dated March 14, 2013 (ADAMS Accession No. ML13073A522)

The NRC Fukushima Near-Term Task Force (NTTF) Report (Reference 1) dated July 12,2011, discusses the gap in capability for US commercial nuclear power plants to perform multi-unit dose assessments (including spent fuel pools as release points). In January 2013, the Nuclear Energy Institute (NEI) provided to the NRC (Reference 2) survey results regarding licensees' capabilities to perform multi-unit dose assessments, implementation time frames to obtain multi-unit dose assessment capability, and compensatory measures for the interim period. The NRC requested further detailed PO Box 620, MC CA-460 Fulton, MD 65251 AmerenMissouri.com

ULNRC-06004 June 27, 2013 Page 2 of6 information (Reference 3) regarding the current and anticipated capabilities of sites to perform multi-unit dose assessment. NEI informed the NRC (Reference 4) that the industry had elected to provide the requested details directly to the NRC staff.

In accordance with Reference 4, this letter from Union Electric Company (dba Ameren Missouri) provides the response for Callaway Plant regarding the current and anticipated capabilities to perform offsite dose assessment during an event involving multiple release sources.

1. Summary of Current Multi-Source Dose Assessment Capability Callaway Plant currently has the capability to perform multi-source dose assessment by performing individual dose assessments for each release point and manually summing the results to make estimates, which could be used for Emergency Action Level (EAL) and Protective Action Recommendation (PAR) determinations.

Callaway Plant currently uses the Management Action Guides for Nuclear Emergencies (MAGNEM) computer software version 21.1.6 for dose assessment. MAGNEM is installed on multiple computers, and there is sufficient depth of trained dose assessment personnel in the Emergency Response Organization (ERO) to perform the dose assessments.

Ameren Missouri has evaluated the current procedural guidance and ERO training for performing multi-source dose assessments and has determined that revisions are needed to address combining the multiple dose assessments and generating consistent EAL and PAR decisions for multi-source releases.

2. Anticipated Schedule for Interim and Permanent Multi-Source Dose Assessment Capability Based on the evaluation discussed in Item 1 above, as an interim action, Ameren Missouri will revise procedures and ERO training to perform multi-source dose assessments by summing individual dose assessments. The schedule for completing the procedure revisions and ERO training for these interim measures is shown in the table on page 3.

For the permanent solution, Callaway Plant will change from the MAGNEM dose assessment code to the RASCAL code. Ameren Missouri will implement the next revision of RASCAL that is capable of performing the multiple release point modeling. Procedure revisions and ERO training changes will be completed to incorporate the RASCAL code.

The schedule for completing all actions necessary to have multi-source dose assessment capability is shown in the table on page 3. These dates are contingent upon the NRC's release of the multi-source RASCAL model by November 30,2013.

ULNRC-06004 June 27, 2013 Page 3 of6 Milestone Estimated Completion Date Interim Action Complete procedure revisions and ERO training to perform September 30, 2013 multi-source dose assessments with MAGNEM.

Permanent Solution Complete procedure revisions and initial ERO training for 8 months following NRC RASCAL. release of RASCAL code capable of performing multiple source modeling.

Currently estimated for July 25, 2014 Implement RASCAL. 8 months following NRC release of RASCAL code capable of performing multiple source modeling.

Currently estimated for July31,2014 Ameren Missouri is tracking completion of the milestone activities in Callaway Plant's Corrective Action Program via Callaway Action Request (CAR) number 201303500.

This letter contains a new commitment identified in the List of Commitments on page 6.

If you have any questions concerning the content ofthis letter, please contact Scott Maglio, Regulatory Affairs Manager, at 573-676-8719.

Cleveland 0. Reasoner Vice President, Engineering SJM/nls

ULNRC-06004 June 27,2013 Page 4 of6 cc: Mr. Arthur T. Howell Regional Administrator U. S. Nuclear Regulatory Commission Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. Fred Lyon Project Manager, Callaway Plant Office ofNuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 0-8B 1 Washington, DC 20555-2738

ULNRC-06004 June 27, 2013 Page 5 of6 Index and send hardcopy to QA File A160.0761 Hardcopy:

Certrec Corporation 4150 International Plaza Suite 820 Fort Worth, TX 76109 (Certrec receives ALL attachments as long as they are non-safeguards and may be publicly disclosed.)

Electronic distribution for the following can be made via Other Situations ULNRC Distribution:

A. C. Heflin F. M. Diya C. 0. Reasoner III B. L. Cox L. H. Graessle P. J. McKenna C. D. Smith S. A. Maglio J. L. Fortman J. T. Patterson Corporate Communications NSRB Secretary T. B. Elwood STARS Regulatory Affairs Mr. John O'Neill (Pillsbury Winthrop Shaw Pittman LLP)

Missouri Public Service Commission Sue Perkins-Grew, NEI, spg@nei.org

ULNRC-06004 June 27,2013 Page 6 of6 LIST OF COMMITMENTS The following table identifies those actions committed to by Ameren Missouri in this document. Any other statements in this document are provided for information purposes and are not considered commitments.

COMMITMENT Due Date/Event COMN Callaway Plant will implement the next 8 months following NRC 50263 revision of RASCAL that is capable of release of the next performing the multiple release point modeling. revision of RASCAL that Procedure revisions and ERO training changes is capable of performing will be completed to incorporate the RASCAL multiple release point code. This commitment date is contingent modeling. This is tracked upon the release of the multi-source RASCAL by Callaway Action model by November 30,2013. Request number 201303500.