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{{Adams
#REDIRECT [[NOC-AE-14003074, Partial Response to Request for Additional Information Associated with Near-Term Task Force Recommendation 2.1, Flood Hazard Reevaluation]]
| number = ML14041A336
| issue date = 01/22/2014
| title = South Texas Project, Units 1 & 2, Partial Response to Request for Additional Information Associated with Near-Term Task Force Recommendation 2.1, Flood Hazard Reevaluation (TAC Nos. MF1110 and MF1111)
| author name = Powell G T
| author affiliation = South Texas Project Nuclear Operating Co
| addressee name =
| addressee affiliation = NRC/Document Control Desk, NRC/NRR
| docket = 05000498, 05000499
| license number =
| contact person =
| case reference number = NOC-AE-14003074, STI: 33810702, TAC MF1110, TAC MF1111
| document type = Letter
| page count = 6
| project = TAC:MF1110, TAC:MF1111
| stage = Response to RAI
}}
 
=Text=
{{#Wiki_filter:Nuclear Operating CompanySouth Tevas Prolect Electric Generating Station PO. Boa 28,9 Wadsworth, Temas 77483January 22, 2014NOC-AE-1 400307410 CFR 50.54(f)U.S. Nuclear Regulatory CommissionAttention: Document Control DeskWashington, DC 20555-0001South Texas ProjectUnits 1 & 2Docket Nos. STN 50-498, STN 50-499STPNOC Partial Response to Request for Additional InformationAssociated With Near-Term Task Force Recommendation 2.1, Flood Hazard Reevaluation(TAC Nos. MF1110 and MF1111)References:1. Letter from NRC to All Power Reactor Licensees, "Request for InformationPursuant to Title 10 of the Code of Federal Regulations 50.54(f) RegardingRecommendations 2.1, 2.3 and 9.3, of the Near-Term Task Force Review ofthe Insights from the Fukushima Dai-ichi Accident" March 12, 2012(ML12056A046).2. Letter from G.T. Powell, STPNOC, to NRC Document Control Desk,"Response to NRC Request for Information Pursuant to 10 CFR 50.54(f)Regarding Recommendation 2.1 Flooding of the Near-Term Task ForceReview of Insights from the Fukushima Dai-ichi Accident, Enclosure 2,Required Response 2, Flood Hazard Reevaluation Report", March 11, 2013(ML13079A806)3. Letter from B. K. Singal, NRC, to D.L. Koehl, STPNOC, "South Texas Project,Units 1 and 2 -Request for Additional Information Regarding FukushimaLessons Learned -Flooding Hazard Reanalysis Report ", January 14, 2014(ML13358A065)On March 12, 2012 (Reference 1), the U.S. Nuclear Regulatory Commission (NRC) staff issueda letter requesting additional information per Title 10 of the Code of Federal Regulations,Section 50.54(f) (hereafter called the 50.54(f) letter). The 50.54(f) letter requested that licenseesreevaluate the flooding hazards at their sites against present-day regulatory guidance andmethodologies. STPNOC submitted the requested Flood Hazard Reevaluation Report to theNRC on March 11, 2013 (Reference 2)STI: 33810702 NOC-AE-14003074Page 2 of 3By letter dated January 14, 2014 (Reference 3), the NRC requested additional information (RAI)related to the flooding reevaluations. Per an agreement with the NRC, STPNOC will beresponding to the RAls in two parts. The first part of the STPNOC response addresses RAls 1,2, 7, 8 and 9. The second part of the STPNOC response will address RAls 3, 4, 5 and 6 and willbe submitted by February 13, 2014.The requested information for RAls 1, 2, 7, 8 and 9 is included in the attachment and enclosuressubmitted along with this letterThere are no commitments in this letter.If there are any questions regarding.this letter, please contact Ken Taplett at (361) 972-8416 orme at (361) 972-7566.I declare under penalty of perjury that the foregoing is true and correct.Executed on .J, 2-. zd'/VG.T. PowellSite Vice PresidentwebAttachment:1. STPNOC Partial Response to Request for Additional Information Related toFukushima Lessons Learned Flooding Hazard Reevaluation Report1. Input files for RAls 1, 2, 7, 8 and 9 (DVD labeled NOC-AE-14003074 Disc 1)Enclosures:
NOC-AE-14003074Page 3 of 3cc:(papercopy)(electronic copy)Regional Administrator, Region IVU. S. Nuclear Regulatory Commission1600 East Lamar BoulevardArlington, TX 76011-4511Balwant K. Singal *Senior Project ManagerU.S. Nuclear Regulatory CommissionOne White Flint North (MS 8 Bi)11555 Rockville PikeRockville, MD 20852NRC Resident InspectorU. S. Nuclear Regulatory Commission* P. 0. Box 289, Mail Code: MN1 16Wadsworth, TX 77483Jim CollinsCity of AustinElectric Utility Department721 Barton Springs RoadAustin, TX 78704A. H. Gutterman, EsquireMorgan, Lewis & Bockius LLPBalwant K. SingalU. S. Nuclear Regulatory CommissionJohn RaganChris O'HaraJim von SuskilNRG South Texas LPKevin PolioRichard PelaL.D. BlaylockCity Public ServicePeter NemethCrain Caton & James, P.C.C. MeleCity of AustinRichard A. RatliffRobert FreeTexas Department of State Health Services* Digital media enclosure is only being transmitted to the NRC Document Control Desk and toSTPNOC's NRC Project Manager, Balwant K. Singal, for distribution to the NRC staff reviewers
 
==Attachment==
1NOC-AE-14003074Page 1 of 3STPNOC Partial Response to Request for Additional InformationRelated to Fukushima Lessons Learned Flooding Hazard Reevaluation ReportRAI 1: Local Intense Precipitation and Associated Site DrainagePlease provide electronic versions of the input files used for HEC-HMS analysis in the flood hazardreevaluation report (FHRR) related to the local intense precipitation analyses.STPNOC Response:The requested information is provided in the enclosed digital media (Disc 1).RAI 2: Local Intense Precipitation and Associated Site DrainagePlease provide electronic versions of the input files used for HEC-RAS analysis in the FHRR relatedto local intense precipitation analyses.STPNOC Response:The requested information is provided in the enclosed digital media (Disc 1).RAI 3: Local Intense Precipitation and Associated Site DrainagePlease provide descriptions of the sources of elevation data, the methods used to incorporateelevation measurements into local intense precipitation flood analysis, and the likely magnitude ofthe errors associated with these elevations.STPNOC Response:The requested information will be provided by February 13, 2014 as part of the second partial RAIresponse.RAI 4: Local Intense Precipitation and Associated Site DrainagePlease provide a description of the basis used to classify Probable Maximum Flood (PMF) flow asshallow concentrated flow used in the Natural Resources Conservation Service (NRCS) TR-55methodology.STPNOC Response:The requested information will be provided by February 13, 2014 as part of the second partial RAIresponse.
 
==Attachment==
1NOC-AE-14003074Page 2 of 3RAI 5: Failure of Dams and Onsite Water Control/Storage StructuresPlease provide details of the ineffective flow areas and levees that were removed from the HalffAssociates, Inc. HEC-RAS model while developing the HEC-RAS model used to reevaluate theflood hazard from upstream dam failures at the South Texas Project (STP), Units 1 and 2 site. Also,please provide a justification for removal of these features.STPNOC Response:The requested information will be provided by February 13, 2014 as part of the second partial RAIresponse.RAI 6: Failure of Dams and Onsite Water Control/Storage StructuresPlease provide details of the intra-basin flows that were allowed to occur in the HEC-RAS model.Also, because allowing intra-basin flows would reduce the discharge at STP, Units 1 and 2 site, thelicensee is requested to provide a justification how the flood hazard from upstream dam failureswould still be conservative.STPNOC Response:The requested information will be provided by February 13, 2014 as part of the second partial RAIresponse.RAI 7: Failure of Dams and Onsite Water Control/Storage StructuresPlease provide electronic versions of the input files used for HEC-RAS analysis in the FHRR relatedto upstream dam failures.STPNOC Response:The requested information is provided in the enclosed digital media (Disc 1)RAI 8: Failure of Dams and Onsite Water Control/Storage StructuresPlease provide the electronic version of National Weather Service (NWS) BREACH model input filesused in the recent Main Cooling Reservoir (MCR) breach analyses of the three postulated breachlocations described in FHRR Section 2.3.STPNOC Response:The requested information is provided in the enclosed digital media (Disc 1).Note: As described in the FHRR (Reference 2) there were no BREACH model simulationsperformed for the Unit I and 2 flood analysis. Rather, the output hydrograph of the BREACH modelthat had been developed for the Units 3 and 4 analyses was used. Also note that the samehydrograph was used for all three breach locations.
 
==Attachment==
1NOC-AE-1 4003074Page 3 of 3RAI 9: Failure of Dams and Onsite Water Control/Storage StructuresPlease provide a description of model configuration, boundary conditions, and model parameters forthe three RMA2 simulations. Also, Please provide the RMA2 input files, including the computationalgrids, used for the three simulations.STPNOC Response:The requested information is provided in the enclosed digital media (Disc 1).Note: A separate input and grid file is provided for the Unit I BREACH model, the Unit 2 BREACHmodel, and the Office BREACH model.
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