ML15240A049

Staff Review of Interim Evaluation Associated with Reevaluated Seismic Hazard Implementating Near-Term Task Force Recommendation 2.1

ML15240A049
Person / Time
Site:	Oyster Creek
Issue date:	02/17/2016
From:	Nicholas Difrancesco Japan Lessons-Learned Division
To:	Bryan Hanson Exelon Generation Co
Wyman, Stephen NRR/JLD 415-3041
References
CAC MF5257
Download: ML15240A049 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 February 17, 2016 Mr. Bryan C. Hanson Preisident and Chief Nuclear Officer Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

OYSTER CREEK NUCLEAR GENERATING STATION - STAFF REVIEW OF INTERIM EVALUATION ASSOCIATED WITH REEVALUATED SEISMIC HAZARD IMPLEMENTATING NEAR-TERM TASK FORCE RECOMMENDATION 2.1 (CAC NO. MF5257)

Dear Mr. Hanson:

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 10 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. to the 50.54(f) letter requested that licensees reevaluate seismic hazards at their sites using present-day methodologies and guidance. Enclosure 1, Item 6, of the 50.54(f) letter requested that licensees 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 letters dated December 19, 2014 1, Exelon Generation Company, LLC (Exelon, the licensee),

provided its ESEP report in a response to Enclosure 1, Item (6) of the 50.54(f) letter, for Oyster Creek Nuclear Generating Station (Oyster Creek). 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, Exelon provided a response dated July 24, 20153 , clarifying submittal information. Based on the NRC staff 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. ML14353A332.

2 The Oyster Creek ESEP NRC review checklist can be found under ADAMS Accession No. ML15238A595.

3 The Exelon response to NRC staff questions can be found ADAMS Accession No. ML15212A242.

B. Hanson 2 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 seismic event up to 1.60 times the licensing basis seismic spectrum for Oyster Creek. 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, Nicholas DiFra co, Senior Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation Docket No. 50-219 cc: Distribution via Listserv

B. Hanson 2 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 seismic event up to 1.60 times the licensing basis seismic spectrum for Oyster Creek. 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. 50-219 cc: Distribution via Listserv DISTRIBUTION:

PUBLIC JLD R/F RidsOeMailCenter RidsNrrPMOysterCreek RidsNrrDorllpl1-2 RidsNrrLASLent RidsRgn1 MailCenter RidsNrrOd DJackson, NRO MShams, NRR NDiFrancesco, NRR ADAMS Accession Number: ML15240A049

• via concurrence e-mail OFFICE NRR/JLD/JHMB/PM NRR/JLD/LA NRO/DSEA/RGS2*

NAME SWyman Slent DJackson*

DATE 8/28/2015 8/31/2015 8/25/2015 OFFICE NRR/JLD/JHMB/BC NRR/JLD/JHMB/PM NAME MShams NDiFrancesco DATE 9/3/2015 2/17/2016 OFFICIAL RECORD COPY