ULNRC-06100, Path Forward for Resolution of Generic Safety Issue (GSI)- 191

Path Forward for Resolution of Generic Safety Issue (GSI)- 191

ML14090A355
Person / Time
Site:	Callaway
Issue date:	03/31/2014
From:	Neterer D Ameren Missouri
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC-06100
Download: ML14090A355 (5)

Text

David W. Neterer

~rt. Vice President, Engineering Ameren Missouri

'=iWAmeren Callaway Energy Center c 573.544.5402 F 573.676.4056 MISSOURI dneterer@ameren.com March 31, 2014 ULNRC-061 00 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 10 CFR 50.54(f)

Ladies and Gentlemen:

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

FACILITY OPERATING LICENSE NPF-30 PATH FORWARD FOR RESOLUTION OF GENERIC SAFETY ISSUE (GSI) -191

References:

1) Ameren Missouri letter ULNRC-05989, "Path Forward for Resolution ofGSI-191," dated May 16, 2013 (Accession No. ML13136A290)

2) Generic Letter (GL) 2004-02, "Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors," dated September 13, 2004 (Accession No. ML042360586)

3) NRC Policy Issue SECY-12-0093, "Closure Options for Generic Safety Issue - 191, 'Assessment of Debris Accumulation on Pressurized-Water Reactor Sump Performance,"' dated July 9, 2012 (Accession No. ML121310648)

By letter dated May 16, 2013, (Reference 1) Union Electric (dba Ameren Missouri) identified the closure path for resolution of Generic Letter 2004-02 (Reference 2) and GSI -191 (as addressed by Reference 3) for the Callaway Plant.

In the May 16, 2013 letter, Ameren Missouri proposed resolution ofGL 2004-02 by pursuing Option 2b, "Full Risk-Informed Resolution Path," of SECY 0093 (Reference 3), noting that the approach being taken for Callaway Plant would utilize the methodology developed by South Texas Project (STP), whose pilot submittal for GSI-191 closure is currently under review by the NRC staff. Like STP, a license amendment request and proposed regulatory exemption will be submitted to achieve resolution of GL 2004-02 for Callaway Plant.

.......................................................................................................... Junction CC & Hwy 0 Fulton, MD 65251 AmerenMissouri.com

.......................................................................................................... PO Box 620, MC CA-460 STARS* Alliance

ULNRC-061 00 March 31, 2014 Page 2 In Attachment 2 of the May 16, 2013 letter, Ameren Missouri issued a commitment (Commitment No.

50261) to submit the requisite license amendment request and proposed regulatory exemption for resolving GL 2004-02 and GSI-191 at Callaway Plant. This letter is being submitted to revise that commitment. The revised commitment is documented in the attachment (Attachment 1) ofthis letter.

Revision of the submittal commitment is based on consideration that the success path for the risk-informed Option 2b approach is dependent on completion of the NRC staffs review and issuance of a Safety Evaluation (SE) for STP's pilot submittal. Currently, STP is resolving the NRC staffs comments and requests for additional information. The delay in a final submittal by STP has extended the NRC's review of the STP pilot submittal, which in turn will postpone the NRC's issuance of the STP SE beyond the Ameren Missouri projection for that milestone.

The revision of Ameren Missouri's submittal commitment is therefore an extension of the submittal date which will also allow sufficient time for performing the necessary analysis using the STP pilot-plant methodology guidance. Specifically, it is proposed that the date for submitting the GSI-191 closure correspondence for Callaway Plant be extended to September 1, 20 17, or to one year after issuance of the NRC's SE for STP, whichever is later.

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

I declare under penalty of perjury that the foregoing is true and correct.

Sincerely, Executed on: ..5 Ol 0 1'-f David W. Neterer Vice President, Engineering DRB : Revised Commitment

ULNRC-061 00 March 31, 2014 Page 3 cc: Mr. Marc L. Dapas 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 of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop 0-8B 1 Washington, DC 20555-2738

ULNRC-061 00 March 31, 2014 Page 4 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 Responses and Reports ULNRC Distribution:

F. M. Diya C. 0. Reasoner III D. W. Neterer L. H. Graessle B.L.Cox S. G. Kovaleski S. A. Maglio T. B. Elwood B. E. Huhmann R. J. Andreasen Corporate Communications NSRB Secretary STARS Regulatory Affairs Mr. John O'Neill (Pillsbury Winthrop Shaw Pittman LLP)

Attachment 1 to ULNRC-061 00 Attachment 1 Revised Commitment Current Commitment in ULNRC-05989 COMMITMENTS Due Date/Event Commitment Number Ameren Missouri will submit the necessary December 31, 2015 50261 request/correspondence (e.g., regulatory exemption request) for resolving GSI-191 at Callaway Plant pursuant to Option 2b (risk-informed approach).

Proposed Change to Commitment 50261 COMMITMENTS Due Date/Event Commitment Number Ameren Missouri will submit closure September 1, 2017 50261, Rev. 1 correspondence (e.g., License Amendment request and proposed regulatory exemption) for OR resolving GSI-191 at Callaway Plant pursuant One year following issuance to SECY-12-0093 Option 2b (risk-informed of the Safety Evaluation for approach). the STP risk-informed GSI-191 resolution submittal, whichever is later.