ML16072A038

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

ML16072A038
Person / Time
Site:	Mcguire, McGuire
Issue date:	03/17/2016
From:	Nicholas Difrancesco Japan Lessons-Learned Division
To:	Capps S Duke Energy Carolinas
STEVE WYMAN 415-3041
References
CAC MF5249, CAC MF5250
Download: ML16072A038 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 March 17, 2016 Mr. Steven D. Capps Vice President - McGuire Site McGuire Nuclear Station 12700 Hagers Ferry Road Huntersville, NC 28078-8985

SUBJECT:

MCGUIRE NUCLEAR STATION, UNITS 1 AND 2 - STAFF REVIEW OF INTERIM EVALUATION ASSOCIATED WITH REEVALUATED SEISMIC HAZARD IMPLEMENTING NEAR-TERM TASK FORCE RECOMMENDATION 2.1 (CAC NOS. MF5249 AND MF5250)

Dear Mr. Capps:

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 17, 2014, 1 and October 8, 2015, 2 and February 4, 2016, 3 Duke Energy Carolinas, LLC (Duke, the licensee), provided its ESEP report in a response to , Item (6) of the 50.54(f) letter, for McGuire Nuclear Station , Units 1 and 2 (McGuire). The NRC staff assessed the licensee's implementation of the ESEP guidance through the completion of a reviewer checklist4. In support of NRC staff questions, Duke supported an audit held September 15, 2015,5 at NRC headquarters. 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 17, 2014, letter can be found under ADAMS Accession No. ML15005A085.

2 The October 8, 2015, letter can be found under ADAMS Accession No. ML15313A153.

3 The February 4, 2016 , letter can be found under ADAMS Accession No. ML16041A173.

4 The McGuire ESEP NRC review checklist can be found under ADAMS Accession No. ML16069A141.

5 The audit summary report can be found under ADAMS Accession No. ML15344A183.

S. Capps The 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 1. 74 times the safe shutdown earthquake for McGuire. 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.

The NRC staff notes that Section 8.4, Table 8-1 of the ESEP Report, as updated in the October 8, 2015, and February 4, 2016, letters, contains a summary of planned actions to complete ESEP activities. The licensee confirmed in its February 4, 2016, letter that all ESEP modifications are now complete and the revised ESEP Report includes updates for the inaccessible items.

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

Sincerely, Nicholas DiFrancesco, Senior Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation Docket Nos. 50-369 and 50-370 cc: Distribution via Listserv

S. Capps The 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 1. 74 times the safe shutdown earthquake for McGuire. 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.

The NRC staff notes that Section 8.4, Table 8-1 of the ESEP Report, as updated in the October 8, 2015, and February 4, 2016, letters, contains a summary of planned actions to complete ESEP activities. The licensee confirmed in its February 4, 2016, letter that all ESEP modifications are now complete and the revised ESEP Report includes updates for the inaccessible items.

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 Nos. 50-369 and 50-370 cc: Distribution via Listserv DISTRIBUTION :

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