ULNRC-06551, Supplemental Information for Response to March 12, 2012 Information Request, Seismic Probabilistic Risk Assessment for Recommendation 2.1
| ML19325D668 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 11/21/2019 |
| From: | Banker S Ameren Missouri, Union Electric Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19325D662 | List: |
| References | |
| ULNRC-06551 | |
| Download: ML19325D668 (3) | |
Text
Aiiieien Callaway Plant MISSOURI November 21, 2019 ULNRC-0655 1 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 10 CFR 5054(O Ladies and Gentlemen:
DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT I UNION ELECTRIC CO.
RENEWED FACILITY OPERATING LICENSE NPf-30 SUPPLE11ENTAL INFORMATION FOR RESPONSE TO MARCH l2 2012 INfOR1IATION RJQ1J1SI$EISMIC PROBABILISTIC RISK ASSESSMENT FOR RECOMMENDATION 2.1
References:
1 Ameren Missouri letter ULNRC-06524, Response to March 1 2, 201 2 Information Request, Seismic Probabilistic Risk Assessment For Recommendation 2.1 dated August 12, 2019 (ML19225D321)
On August 12, 2019, Ameren Missouri provided the Callaway Plant Seismic PRA Summary Report to the NRC staffper Reference I above. The provided report was based on the fully quantified Seismic PRA model completed in March of2019 for the Callaway Plant.
Subsequent to submittal of the report, Ameren Missouri has continued to maintain and improve the Seismic PRA. for example, additional refinements were made to the Seismic PRA based on inspections completed during Callaways Spring 201 9 refueling outage. Due to the refinements that have been made, and as supplemental information to the Reference 1 report, a summary of all the refinements/changes and their impact to the Seismic PRA results is hereby provided as Attachment 2 to this letter.
It should also be noted that in parallel with the development ofthe Seismic PRA model, the software platform for the Internal Events PRA model for Callaway was converted from WinNupra to CAFTA.
This conversion included a number of updates and refinements to the model. Currently, additional changes to the Seismic PRA model are in progress in order to incorporate the changes that were made to the Callaway internal Events model. Following completion ofthe Seismic PRA updates to align with 8315 County Road 459 Steedman, MO 65077 AmerenMissouricom
ULNRC-0655 I November 21, 2019 Page 2 of 3 the Internal Events model, a full quantification will be performed on the Seismic PRA. When that is complete, a supplement to the Seismic PRA summary report will be prepared and submitted to the NRC staff. the supplement wili describe the changes made to the Seismic PR\\ modei and its results, including any changes to contributors to seismic risk.
Ameren Missouri expects to complete the ahovedescrihed work and provide the supplemental information to the NRC staff on or before March 6, 2020.
It should be noted that in Reference I, Arneren Missouri committed to implement two modifications to the Callaway Plant. An update regarding these commitments is provided for your information in Attachment I, wlwrein it is noted that the modifications have been completed.
For any questions regarding this letter or its attachments, please contaLI Justin Fuller at 314-22S1 141 or Bruce Huhmann at 573-694-6741.
I declare under penalty ofperjury that the foregoing is true and correct.
Sincerely, Executed on:
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Commasion 0 11253537 O,frrsstoncxpresMarch O52O Attachments:
I Regulatory Commitment Update 2.
Callaway lEnergy Center Seismic Probabilistic Risk Assessment in Response to 50.54(F) Letter with Regard to NEFF 2. 1 Seismic - Supplemental Inibunation
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ULNRC06551 November 21, 2019 Page3of 3 cc:
Mr. Scott A. Morris Regional Administrator U. S. Nuclear Regulatory Commission Region W I600 East Lamar Boulevard ArlingtonTX 760114511 Senior Resident Inspector Caflaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. L. John Kios Project Manager, Callaway Plant Office ofNuclear Reactor Rcgulafion U. S. Nuclear Regulatory Commission Mail Stop O9E3 Washington, DC 20555-0001 Index and send hardcopy to QA File A1600761 Hardcopy:
Cernc Corporation 6100 Western Place, Suite 1050 Fort Worth, TX 76107
. (Ca receives ALL attachments as long as they are non..safepards and may be publicly disclosed.)
Electronic distribuffon for the following can be made via Responses and Reports ULNRC Distribuflon:
F. M. Di T. B. Hemnmm B. L Cox S.P.Banker F. 3. Bianco R. C. Wink T. B. Liwood
- 3. W. Hitler B. E. Huhmann NSRB Secretary STARS Regulatory Affairs Mr. Jay Silberg (Pillsbury Winthrop Shaw Pitbuan LLP) era1nn-e-*
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