ML14205A014

South Texas Project Unit 1, 10CFR50.46 Thirty-Day Report of Significant ECCS Model Changes

ML14205A014
Person / Time
Site:	South Texas
Issue date:	07/07/2014
From:	Dunn R F South Texas
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
G25, NOC-AE-14003157, STI: 33897028
Download: ML14205A014 (2)

Text

Nuclear Operating CompanySouth Texas Pro/ect Electric Generating Station PO. Box 289 Wadsworth, Texas 77483 -July 7, 2014NOC-AE-14003157File No.: G251 OCFR50.46U. S. Nuclear Regulatory CommissionAttention: Document Control DeskWashington, D.C. 20555-0001South Texas ProjectUnit 1Docket No. STN 50-4981 OCFR50.46 Thirty-Day Report of Siqnificant ECCS Model Chanqes

Reference:

Letter from R.F. Dunn to NRC Document Control Desk, "10CFR 50.46 ECCSEvaluation Model Significant Change/Error Report," dated October 17, 2012,NOC-AE-12002912 (ML12310A383)In accordance with the requirements of 10 CFR 50.46(a)(3)(ii),STP Nuclear Operating Company(STPNOC) is submitting a 30 day report for a significant change in the South Texas Unit 1Emergency Core Cooling Model.The value for the hot assembly average rod Gamma Energy Deposition Model for Unit 1 Cycle19, increased 0.0041 above the analyzed value of 0.984. This resulted in an estimated increasein Peak Clad Temperature (PCT) of 3°F to the value of 2117°F reported in the Reference letter.The new PCT value for Unit 1 Cycle 19 is 2120°F. Since the absolute value of PCT changes tothe Analysis of Record exceeds 50'F, the change is considered significant in accordance with1 OCFR50.46(a)(3)(i).No schedule for reanalysis is proposed since the Unit 1 Cycle 19 PCT remains below the10CFR50.46(b)(1) limit of 2200°F.There are no commitments in this letter.If there are any questions please contact Charlie Albury at (361) 972-8901.Roland F. DunnManagerNuclear Fuel and AnalysiscraSTI: 33897028 NOC-AE-14003157Page 2 of 2cc:(paper copy)(electronic copy)Regional Administrator, Region IVU. S. Nuclear Regulatory Commission1600 East Lamar BoulevardArlington, TX 76011-4511Balwant K. SingalSenior Project ManagerU.S. Nuclear Regulatory CommissionOne White Flint North (MS 8 B1)11555 Rockville PikeRockville, MD 20852NRC Resident InspectorU. S. Nuclear Regulatory CommissionP. 0. Box 289, Mail Code: MNl 16Wadsworth, TX 77483A. H. Gutterman, EsquireMorgan, Lewis & Bockius LLPBalwant K. SingalU. S. Nuclear Regulatory CommissionJohn RaganChris O'HaraJim von SuskilNRG South Texas LPKevin PolioCris EugsterL. D. BlaylockCPS EnergyPeter NemethCrain Caton & James, P.C.C. MeleJohn WesterCity of AustinRichard A. RatliffTexas Department of State HealthServicesRobert FreeTexas Department of State HealthServices