ML15282A019
| ML15282A019 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  (NPF-086) |
| Issue date: | 10/19/2015 |
| From: | Nicholas Difrancesco Japan Lessons-Learned Division |
| To: | Dean Curtland NextEra Energy Seabrook |
| Wyman S, 415-3041, O-13C05M | |
| References | |
| TAC MF5266 | |
| Download: ML15282A019 (2) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Mr. Dean Curtland Site Vice President c/o Michael Ossing Seabrook Station NextEra Energy Seabrook, LLC PO. Box 300 Seabrook, NH 0387 4 October 19, 2015
SUBJECT:
SEABROOK STATION, UNIT 1 - STAFF REVIEW OF INTERIM EVALUATION ASSOCIATED WITH REEVALUATED SEISMIC HAZARD IMPLEMENTING NEAR-TERM TASK FORCE RECOMMENDATION 2.1 (TAC NO. MF5266)
Dear Mr. Curtland:
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 letter dated December 19, 20141, NextEra Energy Seabrook, LLC (NextEra, the licensee),
provided its ESEP report in a response to Enclosure 1, Item (6) of the 50.54{f) letter, for Seabrook Station, Unit 1 (Seabrook). 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, NextEra provided a response dated June 11, 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. ML14360A016.
2 The Seabrook ESEP NRC review checklist can be found under ADAMS Accession No. ML15272A423.
3 The NextEra response to NRC staff questions can be found ADAMS Accession No. ML15162A881.
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 1.30 times the safe shutdown earthquake for Seabrook. 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 no regulatory commitments were made related to modifications listed in Section 8.2 of the Seabrook ESEP report because the licensee confirmed completing the modifications during the fall 2015 refueling outage, prior to the release of this letter.
If you have any questions, please contact me at (301) 415-1115 or via e-mail at Nicholas.DiFrancesco@nrc.gov.
Docket No. 50-443 cc: Distribution via Listserv Sincerely, Nicholas J. Difrancesco, Senior Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation
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 1.30 times the safe shutdown earthquake for Seabrook. 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 no regulatory commitments were made related to modifications listed in Section 8.2 of the Seabrook ESEP report because the licensee confirmed completing the modifications during the fall 2015 refueling outage, prior to the release of this letter.
If you have any questions, please contact me at (301) 415-1115 or via e-mail at Nicholas.DiFrancesco@nrc.gov.
Docket No. 50-443 cc: Distribution via Listserv DISTRIBUTION:
PUBLIC JLD R/F RidsNrrPMSeabrook RidsNrrDorllpl1-2 RidsRgn1 MailCenter DJackson, NRO Sincerely, IRA!
Nicholas J. DiFrancesco, Senior Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation RidsNrrOd RidsNrrLASLent NDiFrancesco, NRR MShams, NRR ADAMS Accession Number: ML15282A019
- via concurrence e-mail OFFICE NRR/JLD/JHMB/PM NRR/JLD/LA DSENRGS2 NAME SWyman Slent DJackson*
DATE 10/8/2015 10/14/2015 9/8/2015 OFFICE NRR/JLD/JHMB/BC NRR/JLD/JHMB/PM NAME MShams NDiFrancesco DATE 10/15/2015 10/19/2015 OFFICIAL RECORD COPY