ML16194A115

Sequoyah Nuclear Plant, Units 1 and 2 - Staff Assessment of the Response to 10 CFR 50.54(f) Information Request - Flood Causing Mechanism Reevaluations(Public)(Cac Nos. MF6032 and MF6033)

ML16194A115
Person / Time
Site:	Sequoyah
Issue date:	07/13/2016
From:	Uribe J F Japan Lessons-Learned Division
To:	James Shea Tennessee Valley Authority
References
CAC MF6032, CAC MF6033
Download: ML16194A115 (3)

Text

OFFICIAL USE ONLY SECURITY RELATED INFORMATION UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 July 13, 2016 Mr. Joseph W. Shea Vice President, Nuclear Licensing Tennessee Valley Authority 1101 Market Street, LP 3R-C Chattanooga, TN 37402-2801 SUBJECT: SEQUOYAH NUCLEAR PLANT, UNITS 1AND2-STAFF ASSESSMENT OF RESPONSE TO 10 CFR 50.54(f) INFORMATION REQUEST-CAUSING MECHANISM REEVALUATION (CAC NOS. MF6032 AND MF6033) Dear Mr. Shea: By letter dated March 12, 2012, the U.S. Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Title 1 O of the Code of Federal Regulations, 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 2 to the 50.54(f) letter requested licensees to reevaluate flood-causing mechanisms using present-day methodologies and guidance. By letter dated March 12, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML 15071 A462), Tennessee Valley Authority (TVA, the licensee) responded to this request for Sequoyah Nuclear Plant, Units 1 and 2 (Sequoyah). By letter dated September 3, 2015 (ADAMS Accession No. ML 15240A 163), the NRC staff sent TVA a summary of the staff's review of the licensee's reevaluated flood-causing mechanisms. The enclosed staff assessment provides the documentation supporting the NRC staff's conclusions summarized in the letter. As stated in the letter, the reevaluated flood hazard results for local intense precipitation and streams and rivers were not bounded by the current design-basis flood hazard. In order to complete its response to Enclosure 2 to the 50.54(f) letter, the licensee is expected to submit a focused evaluation or an integrated assessment, as appropriate, to address these reevaluated flood hazards, as described in the NRC's September 1, 2015, letter (ADAMS Accession No. ML 15174A257). The Enclosure transmitted herewith contains Security-Related Information. When sep arated from the Enclosure, this document is decontrolled. OFFICIAL USE ONLY SECURITY RELATED INFORMATION OFFICIAL USE ONLY SECURITY RELATED INFORMATION J. Shea -2 -If you have any questions, please contact me at (301) 415-3809 or e-mail at Juan.Uribe@nrc.gov. Docket Nos. 50-327 and 50-328 Enclosure: Staff Assessment of Flood Hazard Reevaluation Report cc w/o encl: Distribution via Listserv Ju n Uribe, Pro ct Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation OFFICIAL USE ONLY*SECURITY RELATED INFORMATION OFFICIAL USE ONLY SECURITY RELATED INFORMATION J.Shea -2 -This closes out the NRC's efforts associated with CAC Nos. MF6032 and MF6033. If you have any questions, please contact me at (301) 415-3809 or e-mail at Juan.Uribe@nrc.gov. Docket Nos. 50-327 and 50-328 Enclosure: Staff Assessment of Flood Hazard Reevaluation Report Sincerely, IRA/ Juan Uribe, Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation cc w/encl: Distribution via ListseN DISTRIBUTION: PUBLIC JUribe, NRA GBowman, NRA RidsNrrDorllpl2-2Resource RidsOpaMail Resource ACampbell,NRO MMcBride, NAO MWillingham, NAO ARivera-Varona, NAO JLD R/F MShams, NRA YCheng, NAO RidsNrrDorl Resource RidsNrrLASLent SBreithaupt, NAO RidsNroDsea Resource CCook, NAO RidsNRRJLD Resource JDavis, NRA RidsNrrPMSequoyah Resource RidsRgn2MailCenter RidsOgcMailCenter Resource MBensi, NAO RidsNrrJLD Resource RidsAcrsAcnw_MailCtr Resource ADAMS Accession Nos.: Letter: ML16194A115 (PUBLIC), ML16188A274 NON-PUBLIC) *via email OFFICE NRR/JLD/JHMB/PM NRR/JLD/LA N RO/DSEA/RHM2/BC NAME JUribe SLent CCook DATE 07/07/2016 07/07/2016 06/29/2016 OFFICE NRR/JLD/JHMB/BC(A) NRR/JLD/JHMB/PM NAME GBowman JUribe DATE 07/13/2016 07/13/2016 OFFICIAL RECORD COPY OFFICIAL USE ONLY SECURITY RELATED INFORMATION