ML15273A237

Staff Review of Interim Evaluation Associated with Reevaluated Seismic Hazard Implementation Near-Term Task Force Recommendation

ML15273A237
Person / Time
Site:	Davis Besse
Issue date:	10/19/2015
From:	Nicholas Difrancesco Japan Lessons-Learned Division
To:	Boles B FirstEnergy Nuclear Operating Co
Wyman, Stephen NRR/JLD 415-3041
References
TAC MF5238
Download: ML15273A237 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 October 19, 2015 Mr. Brian D. Boles FirstEnergy Nuclear Operating Company clo Davis-Besse NPS 5501 N. State Route 2 Oak Harbor, OH 43449-9760

SUBJECT:

DAVIS-BESSE NUCLEAR POWER STATION. UNIT 1 - STAFF REVIEW OF INTERIM EVALUATION ASSOCIATED WITH REEVALUATED SEISMIC HAZARD IMPLEMENTATING NEAR-TERM TASK FORCE RECOMMENDATION 2.1 (TAC NO. MF5238)

Dear Mr. Boles:

By letter dated March 12, 2012 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML12053A340), the U.S. Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Title 1O of the Code of Federal Regulations Part 50, Section 50.54(f) (hereafter referred to as the 50.54(f) letter) The request was issued as part of implementing lessons-learned from the accident at the Fukushima Dai-ichi nuclear power plant.

Enclosure 1 to the 50.54(f) letter requested that licensees reevaiuate seismic hazards at their sites using present-day methodologies and guidance. Enclosure 1, Item 6, of the 50.54(f) letter requested that li.censees identify "interim evaluation and actions taken or planned to address the higher seismic hazard relative to the design basis as appropriate, prior to completion of the

[seismic] risk evaluation." In addition to the interim evaluation provided in the March 2014 Seismic Screening and Hazard report, the licensees for the Central and Eastern United States committed to providing the Expedited Seismic Evaluation Process (ESEP) report, an interim evaluation, by December 31, 2014.

By letter dated December 19, 20141, FirstEnergy Nuclear Operating Company, (FENOC, the licensee), provided its ESEP report in a response to Enclosure *1, Item (6) of the 50.54(f) letter, for Davis-Besse Nuclear Power Station, Unit 1 (Davis-Besse). The NRC staff assessed the licensee's implementation of the ESEP guidance through the completion of a reviewer checklist2. In support of NRC staff questions, FENOC provided a response dated July 22, 2015 3 , clarifying submittal information. Based on the NRC staft review of the ESEP report and responses to the staff's questions, the NRC staff concludes that the licensee's implementation of the interim evaluation meets the intent of the guidance.

1 The December 19, 2014, letter can be found under ADAMS Accession No. ML14353A058.

2 The Davis-Besse ESEP NRC review checklist can be found under /!DAMS Accession No. ML15245A816.

3 The FENOC response to NRC staff questions can be found ADAMS Accession No. ML15212A713.

B. Boles The NRC staff concludes that, through the implementation of the ESEP guidance, the licensee identified and evaluated the seismic capacity of certain key installed mitigating strategies equipment that is used for core cooling and containment functions to cope with scenarios that involve a loss of all alternating current power and loss of access to the ultimate heat sink to withstand a review level ground motion based on an actual re-evaluated seismic hazard for Davis-Besse. The licensee's ESEP assessment provides additional assurance which supports continued plant safety while the longer-term seismic evaluation is completed to support regulatory decision making. The NRC staff concludes that the licensee responded appropriately to Enclosure 1, Item (6) of the 50.54(f) letter. Application of this review is limited to the interim evaluation as part of the Recommendation 2.1 Seismic review.

If you have any questions, please contact me at (301) 415-1115 or via e-mail at Nicholas.DiFrancesco@nrc.gov.

Nicholas DiFrancesco, Senior Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation Docket No. 50-346 cc: Distribution via Listserv

B. Boles The NRC staff concludes that, through the implementation of the ESEP guidance, the licensee identified and evaluated the seismic capacity of certain key installed mitigating strategies equipment that is used for core cooling and containment functions to cope with scenarios that involve a loss of all alternating current power and loss of access to the ultimate heat sink to withstand a review level ground motion based on an actual re-evaluated seismic hazard for Davis-Besse. The licensee's ESEP assessment provides additional assurance which supports continued plant safety while the longer-term seismic evaluation is completed to support regulatory decision making. The NRC staff concludes that the licensee responded appropriately to Enclosure 1, Item (6) of the 50.54(f) letter. Application of this review is limited to the interim evaluation as part of the Recommendation 2.1 Seismic review.

If you have any questions, please contact me at (301) 415-1115 or via e-mail at Nicholas.DiFrancesco@nrc.gov.

Sincerely, IRA/

Nicholas DiFrancesco, Senior Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation Docket No. 50-346 cc: Distribution via Listserv DISTRIBUTION:

PUBLIC JLD R/F RidsNrrPMDavisBesse Resource RidsNrrDorllp13-2 RidsNrrLASLent RidsRgn3MailCenter RidsNrrOd DJackson, NRO MShams, NRR NDiFrancesco, NRR ADAMS Accession Number: ML15273A237

• via concurrence e-mail OFFICE NRR/JLD/JHMB/PM NRR/JLD/LA DSEA/RGS2 NAME SWyman Slent DJackson*

DATE 9/29/2015 10/1/2015 8/28/2015 OFFICE NRR/JLD/JHMB/BC NRR/JLD/JHMB/PM NAME MS hams NDiFrancesco DATE 10/5/2015 10/19/2015 OFFICIAL RECORD COPY