ULNRC-06524, Response to March 12, 2012, Information Request, Seismic Probabilistic Risk Assessment for Recommendation 2.1

Response to March 12, 2012, Information Request, Seismic Probabilistic Risk Assessment for Recommendation 2.1

ML19225D322
Person / Time
Site:	Callaway
Issue date:	08/12/2019
From:	Banker S Ameren Missouri, Union Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
Shared Package
ML19225D321	List: ML19225D323 ML19225D324 ULNRC-06524, Response to March 12, 2012, Information Request, Seismic Probabilistic Risk Assessment for Recommendation 2.1
References
ULNRC-06524
Download: ML19225D322 (5)

Text

F:LFI [*4i Aiiie MISSOURI ien Callaway Plant August 12, 2019 ULNRC-06524 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.

RENEWED FACILITY OPERATING LICENSE NPF-30 RESPONSE TO MARCH 12. 2012 INFORMATION REQUEST, SEISMIC PROBABILISTIC RISK ASSESSMENT FOR RECOMMENDATION 2.1 on March 12, 2012, the Nuclear Regulatory Commission (NRC) issued a letter, identified as Reference 1 (in the list ofreferences provided on page 3 ofthis letter), to all power reactor licensees and holders of construction permits in active or deferred status. Enclosure 1 of Reference 1 requested each addressee located in the Central and Eastern United States (CEUS) to submit a Seismic Hazard Evaluation and Screening Report. Reference 2 provided the Seismic Hazard and Screening Report for Callaway Plant. Based on the results ofthe screening evaluation provided in Reference 2, it was determined that Callaway Plant screens in for a required risk evaluation in the form of a Seismic PRA (SPRA), a spent fuel pool evaluation, and a high frequency confirmation (relay chatter) evaluation.

Reference 3 was issued by the NRC and provided the required submittal dates for the SPRAs and remaining high frequency and spent fuel pool seismic evaluations in order for licensees to complete their responses to the March 12, 2012 request for information (Reference 1). In Reference 4, Callaway requested an extension of the submittal date for the SPRA until December 3 1 201 8 In Reference 5, the NRC approved the extension request for submittal of the SPRA and the corresponding seismic Mitigating Strategies Assessment (MSA. In Reference 7, Callaway requested a second extension of the submittal date for the SPRA until September 30, 2019. In Reference 8, the NRC approved the submittal extension request for the SPRA and MSA. (Subsequently, it was determined that an MSA is not required for Callaway. In addition, Arneren Missouri completed the spent fuel pool evaluation for Callaway Unit 1 as reviewed by the NRC per Reference 6).

In addition, within the due date established per Reference 8, the Callaway Plant Unit 1 SPRA Summary Report is hereby provided as Attachment 2 to this letter. The report provides the information requested in Enclosure 1 Item (8)B of Reference 1.

:::::::::::::: 83 15 County Road 459 : Steedinan, Pv1J 65077 : \.rnerenNtissouri.corn I

ULNRC-06524 August 12, 2019 Page 2 of 5 This letter identifies two new commitments for the Callaway Plant. Specifically, Ameren Missouri commits to implementing two plant modifications that are credited in the base model SPRA results described in the attachment to this letter. One of the modifications calls for installing anchorage to the Alternate Emergency Power Supply (AEPS) transformer (XPBO5). The other modification will increase the gap between two fire sprinkler heads and fire proofing insulation in the 1 974 elevation of the Control Building. These commitments are identified in Attachment 1 to this letter.

For any questions regarding this letter or its attachments, please contact Justin Hiller at 314-225-1141 or Bruce Huhmann at 573-694-6741.

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

Sincerely, Executed on: C c2_) 9 Stephanie Banker Vice President, Engineering Attachments:

1 . List of Regulatory Commitments

2. Callaway Plant Unit 1 Seismic Probabilistic Risk Assessment in Response to 1 0 CFR 50.54(f)

Letter with Regard to NTTF 2. 1 : Seismic

ULNRC-06524 August 12, 2019 Page 3 of 5

References:

1 . NRC Letter, Request for Information Pursuant to Title 10 of the Code of federal Regulations

50. 54(f) Regarding Recommendations 2.1, 2.3, and 9.3 ofthe Near-Term Task Force Review of Insights from the Fukushima Daiichi Accident, dated March 12, 2012 (ML12053A340)

2. ULNRC-061 02, Ameren Missouri Seismic Hazard and Screening (CEUS Sites) Response to NRC Request for Information Pursuant to 1 0 CfR 50.54(f) Regarding Recommendation 2. 1 of the Near-Term Task Force Review of Insights from the Fukushima Daiichi Accident, dated March 28, 2014 (ML14090A448) 3 . NRC Letter, Final Determination of Licensee Seismic Probabilistic Risk Assessments Under the Request for Information Pursuant to Title 1 0 of the Code of Federal Regulations 50.54(f)

Regarding Recommendation 2. 1 Seismic of the Near-Term Task Force Review of Insights from the Fukushima Daiichi Accident, dated October 27, 201 5 (ML15194A015)

4. ULNRC-06377, Request For Extension of Seismic Probabilistic Risk Assessment Submittal, dated June 15, 2017 (ML17166A474)

5. NRC Letter, Callaway Plant, Unit 1 NRC Response to Request for Extension of Seismic Probabilistic Risk Assessment Submittal, dated August 22, 2017 (ML17200D113)

6. NRC Letter, Callaway Plant, Unit 1 Staff Review of Spent Fuel Pool Evaluation Associated with Reevaluated Seismic Hazard Implementing Near-Term Task Force Recommendation 2.1:

Seismic, dated January 23, 2018 (ML12003B419)

7. ULNRC-06469, Request for Extension of Seismic Probabilistic Risk Assessment Submittal, datedNovember 14, 2018 (ML18318A059)

8. NRC Letter, Callaway Plant, Unit 1 Response to Request for Extension of Seismic Probabilistic Risk Assessment Submittal, dated January 10, 2019 (ML19004A400)

ULNRC-06524 August 12, 2019 Page 4 of 5 cc: Mr. Scott A. Morris 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. L. John Klos Project Manager, Callaway Plant Office ofNuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop 09E3 Washington, DC 20555-0001

ULNRC-06524 August 12, 2019 Page 5 of 5 Index and send hardcopy to QA file A160.0761 Hardcopy:

Certrec Corporation 6100 Western Place, Suite 1050 fort Worth, TX 76107 (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 T. E. Herrmann B. L. Cox S. P. Banker F. J. Bianco R. C. Wink T. B. Elwood J. W. Hiller B. E. Huhmann NSRB Secretary STARS Regulatory Affairs Mr. Jay Silberg (Pillsbury Winthrop Shaw Pittman LLP)