ULNRC-06377, Request for Extension of Seismic Probabilistic Risk Assessment Submittal

Request for Extension of Seismic Probabilistic Risk Assessment Submittal

ML17166A474
Person / Time
Site:	Callaway
Issue date:	06/15/2017
From:	Herrmann T Ameren Missouri, Union Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
ULNRC-06377
Download: ML17166A474 (4)

Text

Timothy E. Herrmann, Site Vice President A fflCtI MISSOURI Ameren Missouri Callaway Energy Center T 5736192155 F 5736764056 therrmann@ameren.com June 152017 U LN RC -06377 U.S. Nuclear Reulatorv Commission Attn: Document Control Desk Washington. DC 20555-0001 10 CFR 50.54(f)

Ladies and Gentlemen:

DOCKET NUMBER 50-483 CALLAWAY PLANT tINIT I tIN ION ELECTRIC CO.

RENEWED FACILITY OPERATING LICENSE NPF-30 REQtJEST FOR EXTENSiON OF SEISMIC PROBABILISTIC RISK ASSESSMENT SUBMITTAL

References:

1. NRC Letter. Request for Information Pursuant to Title 1 0 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.]. 2.3, and 9.3 ottbe Near-Term Task Force Review of Insights from the Fukushima Dalichi Accident. dated March 12, 2012 (ML12053A340)

2. ULNRC-06102. Ameren Missouri Seismic Hazard and Screening (CEUS Sites) Response to NRC Request for Information Pursuant to 10 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

3. NRC Letter, final Determination of Licensee Seismic Probabilistic Risk Assessments Under the Request for Inspection Pursuant to Title 10 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 F ukushima Daiichi Accident, dated October 27, 2015 (ML]5194A015)

On March 12. 2012. the Nuclear Regulatory Commission (NRC) issued Reference 1 to all power reactor licensees and holders of construction permits in active or deferred status. Enclosure I of Reference I 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 of the screening evaluation provided in Reference 2, it was determined that Callaway Plant screens in for a risk evaluation (SPRA). a spent Junction CC & Hwy 0 Fulton MO 65251 ArnerenMissour, corn P0 Box 620, MC CA460 STARS Alliance

ULNRC-063 77 June 15, 2017 Page 2 file! 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 seismic evaluations (high frequency and spent fuel pool) in order for licensees to complete their responses to the March 12, 2012 request for iifonnation (Reference 1). Callaways submittal date is identified as December 31. 2017. for Callaway, the SPRA will assess the effects of high frequency exceedance on plant equipment, and is expected to be one submittaL. The spent fuel pool evaluation is anticipated to be a separate submittal.

In order to complete the SPRA evaluation for the Callaway Plant. an extension of 12 months is requested, which would move the implementation date to December 31, 2018. The need for an extension was discussed with NRC staff via telephone in May 2017. As noted in that discussion, the initial results received for Callaways SPRA are not believed to be a realistic representation of the seismic risk at the pLant. Currently. focus is on identifying possible drivers for the results and performing refinements to the SPRA model. This additional time is required to fuily complete seismic PRA modeling and analysis that realistically quantifies the seismic risk at Callaway Plant.

It is anticipated that the spent fuel pool evaluation will still be submitted by the required date of December 31. 2017.

This letter does not contain new commitments. If you have any questions, please contact Justin Ruler at 314-225-1141 or Brtice Huhmann at 573-694-6741.

Sincerely, Timothy Remruann Site Vice President

ULNRC-06377 June 15, 2017 Page 3 cc: Mr. Kriss M. Kennedy 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 of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop O8H4 Washington, DC 20555-000 1

ULNRC-063 77 June 15,2017 Page 4 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 tion-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. Herniiatm

3. L. Cox S. P. Banker R. C. Wink T. B. Elwood J. W. Hiller B. F. Huhrnann Z. Li Corporate Communications NSRB Secretary STARS Regulatory Affairs Mr. Jay Silberg (Pillsbury Winthrop Shaw Pittman LLP)