ML15294A203

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NRC Report for the Audit of Tennessee Valley Authority'S Flood Hazard Reevaluation Report Submittals Relating to the Near-Term Task Force Recommendation 2.1-Flooding for Browns Ferry, Units 1,2 & 3, Sequoyah, Units 1 & 2, and Watts Bar, Uni
ML15294A203
Person / Time
Site: Browns Ferry, Watts Bar, Sequoyah  Tennessee Valley Authority icon.png
Issue date: 10/30/2015
From: Uribe J F
Japan Lessons-Learned Division
To: Shea J W
Tennessee Valley Authority
Uribe, Jun, NRR/JLD 415-3809
References
TAC MF5857, TAC MF5858, TAC MF6032, TAC MF6033, TAC MF6034, TAC MF6035, TAC MF6036
Download: ML15294A203 (11)
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Text

OFFICIAL USE ONLY*SECURlfY RELATED INFORMATION UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Mr. Joseph W. Shea Vice President, Nuclear Licensing Tennessee Valley Authority 1101 Market Street, LP 3R-C Chattanooga, TN 37402-2801 October 30, 2015

SUBJECT:

NUCLEAR REGULATORY COMMISSION REPORT FOR THE AUDIT OF TENNESSEE VALLEY AUTHORITY'S FLOOD HAZARD REEVALUATION REPORT SUBMITTALS RELATING TO THE NEAR-TERM TASK FORCE RECOMMENDATION 2.1-FLOODING FOR: BROWNS FERRY NUCLEAR PLANT, UNITS 1, 2 AND 3; SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2; AND WATTS BAR NUCLEAR PLANT, UNITS 1 AND 2 (TAC NOS. MF6034, MF6035, MF6036, MF6032, MF6033, MF5857 AND MF5858)

Dear Mr. Shea:

By letter dated April 17, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML 15106A632), the U.S, Nuclear Regulatory Commission (NRC) informed you of the staff's plan to conduct a regulatory audit of Tennessee Valley Authority's (TVA) Flood Hazard Reevaluation Report (FHRR) submittals related to the Near-Term Task Force Recommendation 2.1-Flooding for Browns Ferry Nuclear Plant, Units 1, 2 and 3; Sequoyah Nuclear Plant, Units 1 and 2; and Watts Bar Nuclear Plant, Units 1 and 2. The audit was intended to support staff reviews of FHRRs and the subsequent issuance of a staff assessment. The audit(s) were conducted over multiple sessions from April 2015 to July 2015 and were performed consistent with NRC Office of Nuclear Reactor Regulation, Office Instruction LIC-111, "Regulatory Audits," dated December 29, 2008, (ADAMS Accession No. ML082900195). Therefore, the purpose of this letter is to provide you with the final audit report, which summarizes and documents the NRC's regulatory audit of TVA's FHRR submittals. The details of this audit report have been discussed with Mr. Russell Thompson of your staff. Attachment 2 transmitted herewith contains Security-Related Information. When separated from the Enclosure, this document is decontrolled. OFFICIAL USE ONLY SECURITY RELA:r.E.D-INF-ORMATION

.oi;i;1c1Ab USE! ONbY SECURITY RELATED INFORMATION J. Shea If you have any questions, please contact me at (301) 415-3809 or by e-mail at Juan.Uribe@nrc.gov. Docket Nos. 50-259, 50-260, 50-296, 50-327, 50-328, 50-390 and 50-391

Enclosure:

Audit Report cc w/encl: Distribution via Listserv Sincerely, 0 r* c,****; ' ( uµ"-Juan Uribe, Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation 1 OFFICIAL USE ONLY SECURITY RELATi;D INFORMATION UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 TENNESSEE VALLEY AUTHORITY'S FLOOD HAZARD REEVALUATION REPORT SUBMITTALS RELATING TO THE NEAR-TERM TASK FORCE RECOMMENDATION 2.1-FLOODING FOR: BROWNS FERRY NUCLEAR PLANT. UNITS 1. 2 AND 3; SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2; AND WATTS BAR NUCLEAR PLANT, UNITS 1 AND 2 BACKGROUND AND AUDIT BASIS: By letter dated March 12, 2012, the U.S. Nuclear Regulatory Commission (NRC) issued a request for information to all power reactor licensees and holders of construction permits in active or deferred status, pursuant to Title 10 of the Code of Federal Regulations (1 O CFR), Section 50.54(f) "Conditions of license" (hereafter referred to as the "50.54(f) letter). The request was issued in connection with implementing lessons-learned from the 2011 accident at the Fukushima Dai-ichi nuclear power plant, as documented in The Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident. Recommendation 2.1 in that document recommended that the staff issue orders to all licensees to reevaluate seismic and flooding for their sites against current NRC requirements and guidance. Subsequent Staff Requirements Memoranda (SRM) associated with Commission Papers SECY 11-0124 and SECY-11-0137, instructed the NRC staff to issue requests for information to licensees pursuant to 10 GFR 50.54(f). By letter's dated March 12, 2015, Tennessee Valley Authority (TVA, the licensee) submitted its Flood Hazard Reevaluation Reports (FHRRs) for Browns Ferry Nuclear Plant, Units 1, 2, and 3 (BFNP, Browns Ferry) ( Agencywide Documents Access and Management System (ADAMS) Accession No. ML 15072A 130); Sequoyah Nuclear Plant, Units 1 and 2 (SQN, Sequoyah) (ADAMS Accession No. ML 15071A462); and Watts Bar Nuclear Plant, Units 1 and 2 (WBN, Watts Bar) (ADAMS Accession No. ML 15071A262). The NRG is in the process of reviewing the aforementioned submittals and has completed a regulatory audit of TVA to better understand the development of the submittals, identify any similarities/differences with past work completed and ultimately aid in its review of licensees' FHRRs. This audit summary is being completed in accordance with the guidance set forth in NRG Office of Nuclear Reactor Regulation, Office Instruction LIC-111, "Regulatory Audits," dated December 29, 2008, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML082900195). Enclosure OFFICIAL USE ONLY SECURITY RELATED INt:ORMATION

  • OIBIBICIAL US& ONLY SECURITY RELATED AUDIT LOCATION AND DATES: The audit was completed over multiple sessions over a period of 4 months, as described below:
  • April 22, 2015 from 1 :OOpm to 4:00pm-webinar session
  • May 12, 2015 from 1:00pm to 4:00pm-webinar session
  • June 3-4, 2015 from 8:00am to 4:00pm-TVA Head Quarters Chattanooga, TN
  • July 30, 2015 from 1 :OOpm to 2:00pm-Exit Meeting Conference call. AUDIT TEAMS: Title Team Member Organization Team Leader, NRR/JLD Juan Uribe NRC Branch Chief, NRO/DSEA Christopher Cook NRC Technical Lead Michael Willingham NRC Technical Support Yuan Cheng NRC Technical Support Stephen Breithaupt NRC Licensing Russell Thompson TVA Projects Thomas Spink TVA Engineering Penny Selman TVA Projects Kevin Dutton TVA Projects Kvle Bianco TVA EnQineerinQ Karen Carboni TVA Projects Scott Carter TVA Projects Dennis Lundy TVA Engineering Justin Huber TVA Contractor Trevor Cropp BWSC Contractor Eric KinQ BWSC Contractor Heather Smith BWSC Contractor Stu Henry BWSC
  • OFFICIAb USE ONLY SECURITY RELATED INFORMATION
  • OFFICIAL USE ONLY SECURITY RELATl5Q INFORMATION DOCUMENTS AUDITED: Attachment 1 of this report contains Table 1, which details the documents that were reviewed by the NRC staff, in part or in whole, as part of this audit. The documents were located in an electronic reading room during staff review. AUDIT ACTIVITIES: In general, the audit activities consisted mainly of the following actions:
  • Review background information on site topography and geographical characteristics of the watershed.
  • Review site physical features and plant layout
  • Understand the selection of important assumptions and parameters that would be the basis for evaluating the individual flood causing mechanisms described in the 50.54(f) letter.
  • Review model input/output files to computer analyses, such as the Hydrologic Engineering Center (HEC)-River Analysis System (RAS) and HEC-Hydrologic Modeling System (HMS) to have an understanding of how modeling assumptions were programmed and executed Attachment 2 of this report contains Table 2, which provides more detail and summarizes specific technical topics (and resolution) of important items that were discussed and clarified during the audit. The items discussed in Table 2 may be referenced/mentioned in the staff assessment in more detail. EXIT MEETING/BRIEFING: During the audit exit meeting held on July 30, 2015, the NRC communicated that:
  • No findings or open/unresolved items were found during the audit,
  • TVA did not provide information in its FHRR or during the audit related to certain flood event duration parameters (including warning time and period of inundation) and flood related associated effects. Based on discussions with your staff, these are being developed by TVA and will be evaluated by the NRC during the NRC staff's review of the Mitigating Strategies Assessment (MSA). Additional information related to the MSAs is described in NRC letter, "Coordination of Request for Information Regarding Flooding Hazard Reevaluation and Mitigating Strategies for Design-Basis External Events" (ADAMS Accession No. ML 15174A257). This letter describes the changes in the NRC's approach to the flood hazard reevaluations that were approved by the Commission in its SRM to COMSECY-15-0019, "Closure Plan for the Reevaluation of Flooding Hazards for Operating Nuclear Power Plants" (ADAMS Accession No. ML 15209A682). 1. Attachment 1-List of References Reviewed by the NRC
  • OFFICl.A.L USE ONLY-SECURITY RELATED INFORMATION OFFICIAL USE QNL-¥-SEG.YR-1+¥ RELATED INF-ORMA.+-iTl.....,O'+'IN---4-2. Attachment 2-Information Needs Discussed During Audit-Security Related Information
  • OFFICIAL USE ONLY*SECURITY RELATED INFORMATION OFFICIAl USE ONLY SEGURFr¥--RELATED INFORMATION Table 1: List of References Reviewed by the NRC Calculation Packages Cited TVA (Tennessee Valley Authority), 2008, Calculation CDQ000020080053, Revision 1, PMF Inflows, EDMS #841 120628 004. TVA (Tennessee Valley Authority), 2012, Calculation CDQ0000002012000006, Revision 001, BWSC Calculation TVAGENQ114007, Revision 0, HEC-RAS Model Calibration and Model Set-up-Main Stem, EDMS #841140919 002. TVA (Tennessee Valley Authority), 2013a, Calculation CDQ0000002013000007, Revision 001, BWSC Calculation TVAGENQ 14001, Revision 1, Main Stem Initial Dam Rating Curves. TVA (Tennessee Valley Authority), 2013b, Calculation CDQ0000002014000013, Revision 000, BWSC Calculation TVAGENQ13004, Revision 0, Baseflow. TVA (Tennessee Valley Authority), 2013c, Calculation CDQ0000002013000057, Fukushima NTTF Recommendation 2.1: Sequoyah Local Intense Precipitation Analysis, Revision 1. TVA (Tennessee Valley Authority), 2013d, Calculation CDQ0000002013000163, Fukushima NTIF Recommendation 2.1: Watts Bar Local Intense Precipitation Analysis, Revision 1, EDMS #T71 140606 801. TVA (Tennessee Valley Authority), 2014a, Calculation CDQ0000002014000012, Revision 000, BWSC Calculation TVAGENQ13005, Revision 0, Unit Hydrograph Adjustment. TVA (Tennessee Valley Authority), 2014b, Calculation CDQ0000002014000014, Revision 000, BWSC Calculation TVAGENQ13003, Revision 0, Curve Number Determination. TVA (Tennessee Valley Authority), 2014c, Calculation CDQ0000002014000015, Revision 000, BWSC Calculation TVAGENQ13008, Revision 0, Inflows TVA (Tennessee Valley Authority), 2014d, Calculation CDQ0000002014000016, Revision 001, BWSC Calculation TVAGENQ14001, Revision 1, Tributary Initial Dam Rating Curves. TVA (Tennessee Valley Authority), 2014e, Calculation CDQ0000002014000018, Revision 000, BWSC Calculation TVAGENQ13007, Revision 0, HEC-RAS Tributary Model Calibration, EDMS #841140919 003. OFFICIAL USE 0Nl¥-SECURIT¥ RELATED INFORMATION Attachment 1
  • OFFICIAb USE! ONLY SECURITY RELATED INFORMATION TVA (Tennessee Valley Authority), 2014f, Calculation CDQ0000002014000019, Revision 001, BWSC Calculation TVAGENQ14003, Revision 1, HEC-RAS Tributary Unsteady Flow Rules. TVA (Tennessee Valley Authority), 2014g, Calculation CDQ0000002014000023, Revision 000, BWSC Calculation TVAGENQ14009, Revision 0, Fukushima NTIF Recommendation 2.1: HEC-RAS Probable Maximum Flood Simulations. TVA (Tennessee Valley Authority), 2014h, Calculation CDQ0000002014000024, Revision 000, BWSC Calculation TVAGENQ14010, Revision 0, Fukushima NTIF Recommendation 2.1: Seismic Dam Failure Simulations TVA (Tennessee Valley Authority), 2014i, Calculation CDQ0000002014000025, Revision 000, BWSC Calculation TVAGENQ14011, Revision 0, Fukushima NTIF Recommendation 2.1: Sunny Day Dam Failure Simulations TVA (Tennessee Valley Authority), 2014j, Calculation CDQ0000002014000030, Revision 000, BWSC Calculation TVAGENQ14015, Revision 0, Inflow Hydrograph Development for Seismic Events TVA (Tennessee Valley Authority), 2014k, Calculation CDQ0000002014000032, Revision 000, BWSC Calculation TVAGENQ14018, Revision 0, Fukushima NTIF Recommendation 2.1: Uncertainty Simulations. TVA (Tennessee Valley Authority), 20141, Calculation CDQ0000002014000033, Revision 000, BWSC Calculation TVAGENQ14020, Revision 0, Fukushima NTIF Recommendation 2.1: Wind Waves for Combined -Effect Floods TVA (Tennessee Valley Authority), 2014m, Calculation CDQ00000020140000249, Revision 1, BWSC Calculation TVABFNQ13001, Revision 1 Fukushima NTTF Recommendation 2.1: Browns Ferry Local Intense Precipitation Analysis. Additional Cited Documents from the ERR TVA (Tennessee Valley Authority), 2015a, Technical Memorandum, "National Inventory of Dams Inflows." December 19, 2014, EDMS #W50 150107 001. TVA (Tennessee Valley Authority), 2015b, Multiple Dam Failure Screening Analysis for the Tennessee Valley Authority's Dams, March 31, 2014, EDMS #W50 150108 001. TVA (Tennessee Valley Authority), 2015c, Simplified Volume Analysis for Multiple Dam Failures, November 24, 2014. EDMS #W50 141126 001 TVA (Tennessee Valley Authority), 2015d, From Electronic Reading Room, "NRC Flood HRR Audit Meeting (6-3 4-2015) TVA (Tennessee Valley Authority), 2015e, From Electronic Reading Room, "6_3_2015 Webinar Main Slides 6 1 final R3.pdf'
  • OFFICIAL USE ONLY SECURITY Rl5bATl5D INFORMATIOt>.I OFFICIAL USE ONLY SECURITY RELATED INFORMATION TVA (Tennessee Valley Authority), 2015f, "NRC Flood HRR Audit Meeting (5-12-2015)" TVA (Tennessee Valley Authority), 2015g, "5_12_2015 Webinar Main Slides 5 9 2015 bwsc edits(2)" TVA (Tennessee Valley Authority), 2015h, "21400 PMF SQN Inundation Time" TVA (Tennessee Valley Authority), 2015i, "21400 PMF WBN Inundation Time" TVA (Tennessee Valley Authority), 2015j, "7980 No EAP-BFN.pptx" TVA (Tennessee Valley Authority), 2015k, "Attachment 2-Multiple Seismic Volumes" TVA (Tennessee Valley Authority), 20151, "Sediment WBN (2).pptx" TVA (Tennessee Valley Authority), 2015m, "Seismic Warning Time SQN.pdf" TVA (Tennessee Valley Authority), 2015n, "W50 150309 002 Watts Bar Dam Sediment.pdf' TVA (Tennessee Valley Authority), 20150, "Army Corps of Engineers Engineering Technical Letter (ETL) 1110-2-8 [1966]" TVA (Tennessee Valley Authority), 2015p, "BFN_EAST Storage _and_XS _Stage _comparison. pdf' TVA (Tennessee Valley Authority), 2015q, "BFN East Time of Concentration paths.pdf' TVA (Tennessee Valley Authority), 2015r, "CRH 23W201SR9_SD1.pdf" TVA (Tennessee Valley Authority), 2015s, "CRH 23W203SR4 SD2 & SD3.pdf' TVA (Tennessee Valley Authority), 2015t, "CRH 20020130 TVA Dwg23W202R12 SouthEmbankmentPlansSections (2).pdf' TVA (Tennessee Valley Authority), 2015u, "CRH 20141218 Stantec ExcerptFromPMFModificationsForWBN2byRCC (4).pdf' TVA (Tennessee Valley Authority), 2015v, "CRH 20150604 TVA SaddleEmbankmentWaveEffects" TVA (Tennessee Valley Authority), 2015w, "Douglas Overtopping.pptx" TVA (Tennessee Valley Authority), 2015x, "Rouse number.docx" TVA (Tennessee Valley Authority), 2015y, "W50 150129 001 Breach Selection Memo 20121219 150490258" TVA (Tennessee Valley Authority), 2015z, "W50 150604 001, Wind Wave Methodology Comparison Memo Final" TVA (Tennessee Valley Authority), 2015aa, "WBN Intake Channel Configuration.pdf' TVA (Tennessee Valley Authority), 2015ab, "Wind Gage Height.ootx" TVA (Tennessee Valley Authority), 2015ac, "WBN 7980.pdf' TVA (Tennessee Valley Authority), 2015ad, "Seismic Warning Time WBN" TVA (Tennessee Valley Authority), 2015ae, "Sediment WBN (2)" Other Referenced Documents l OFFICIAL USE ONbY SECURITY RELATED INFORMATION

.. OFFICIAi l !SE Obi! Y-SECI IRITY RELATED INFORMATION ANSI/ANS (American National Standards Institute/American Nuclear Society), 1992, ANSl/ANS-2.8-1992, "Determining Design Basis Flooding at Power Reactor Sites," American Nuclear Society, LaGrange Park, IL, July 1992. [Section 5.5.4.2.3 Earth and Rockfill] Breithaupt, S., R. Prasad, J. Staeheli, C. Lee, T. Kim, and R. Labiosa. 2010. Bellefonte Units 3 and 4, Development of Confirmatory Model of the Tennessee River. Prepared for the U.S. Nuclear Regulatory Commission under an lnteragency Agreement with the U.S. Department of Energy Contract DE-AC05-76RL01830. PNNL-19698. Pacific Northwest National Laboratory, Richland, Washington. Chow, V.T., 1959, Open-Channel Hydraulics, McGraw-Hill, New York. NRC, (U.S. Nuclear Regulatory Commission). 2015. "Watts Bar Nuclear Plant, Unit 1 -Issuance of Amendment to Revise Updated Final Safety Analysis Report Regarding Changes to Hydrology Analysis." January 28, 2015. ADAMS Accession No. ML 15005A314. TVA, (Tennessee Valley Authority). 2014. Supplement to Application to Revise Watts Bar Nuclear Plant Unit I Updated Final Safety Analysis Report Regarding Changes to Hydrologic Analysis (WBN-UFSAR-12-01). September 30, 2014. Page E7-2 of part 6 of 6, Enclosure 7-Dam Modifications. (ML 14289A112 [part of ML 14289A1061). USACE (U.S. Army Corp of Engineers), "Hydraulic Design Criteria", U.S. Army Engineer Waterway Station, Eighteenth Issue, Hydraulic Design Chart 711 (HOC 711 ), Vicksburg, MS, 1998.

  • OFFICIAb USE ONbY SECblRIT.Y REbATEC INFORMATION

Package: ML151294A199; PUBLIC Letter: ML15294A203 :NON PUBLIC: ML 15294A194 *via email OFFICE NRR/JLD/JHMB/PM NRR/JLD/JHMB/LA NRO/DSEA/RHMB1 NRR/JLD/JHMB/BC NRR/JLD/JHMB/PM NAME JUribe SLent CCook* MShams JUribe DATE 10/ 26 /2015 10/ 26 /2015 10/30/2015 10/ 29 /2015 10/ 30 /2015

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