ML14351A073

Turkey Point, Units 3 and 4 - 10 CFR 50.46 Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors, 30 Day Special Report

ML14351A073
Person / Time
Site:	Turkey Point
Issue date:	12/03/2014
From:	Kiley M Florida Power & Light Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-2014-359
Download: ML14351A073 (2)

Text

0 December 3, 2014FPL. L-2014-35910 CFR 50.46U.S. Nuclear Regulatory CommissionAttn: Document Control DeskWashington, D. C. 20555-0001Re: Turkey Point Units 3 and 4Docket Nos. 50-250 and 50-25110 CFR 50.46, "Acceptance Criteria forEmergency Core Cooling Systems in Light WaterNuclear Power Reactors" -30 Day Special Report

References:

1. Florida Power & Light Company (FPL) letter, M. Kiley to U. S. Nuclear RegulatoryCommission, "Turkey Point Unit 3, Docket No. 50-250, 10 CFR 50.46, 'Acceptance Criteria forEmergency Core Cooling Systems in Light Water Nuclear Power Reactors' -30 Day SpecialReport," L-2014-077, March 24, 2014.2. Florida Power & Light Company (FPL) letter, M. Kiley to U. S. Nuclear RegulatoryCommission, "Turkey Point Unit 4, Docket No. 50-251, 10 CFR 50.46, 'Acceptance Criteria forEmergency Core Cooling Systems in Light Water Nuclear Power Reactors' -30 Day SpecialReport," L-2014-302, October 15, 2014.10 CFR 50.46(a)(3)(ii) requires that changes to the Large Break Loss of Coolant Accident(LBLOCA) Evaluation Model (EM) and Small Break LOCA (SBLOCA) EM peak clad temperature(PCT) exceeding 50°F have to be reported to the NRC within 30 days. This letter meets thisrequirement.FPL letters L-2014-077 (Reference 1) and L-2014-302 (Reference 2) submitted the 30 DaySpecial Reports for Turkey Point Units 3 and 4, respectively. The 30 Day Special Reportsdocumented a LBLOCA PCT of 2121OF with a cumulative change of 770F. The LBLOCA PCTreported in the 30 day special reports removed the 120F mixed core penalty no longer applicablefor Unit 3 Cycle 27 and Unit 4 Cycle 28 and future cycles with only 15x1 5 Upgraded fuelassemblies.By letter dated November 19, 2014, Westinghouse identified an error in the LBLOCA EM in thecalculation of decay heat in the WCOBRA/TRAC code. Correction of the errors impacts theapplication of the sampled decay heat uncertainty, which may result in small changes to thedecay heat power. These issues have been evaluated to estimate the impact on AutomatedStatistical Treatment of Uncertainty Method (ASTRUM) Best-Estimate (BE) LBLOCA analysisresults. The correction of these errors resulted in an estimated impact of +3 OF on LBLOCA PCTfor Turkey Point Units 3 and 4. Table 1 below provides a summary of the new LBLOCA PCT forTurkey Point Units 3 and 4. The revised LBLOCA PCT for Units 3 and 4 is 2124 OF with acumulative change of 80°F due to the LBLOCA EM errors. The SBLOCA EM is not affected bythe identified errors.Florida Power & Light Company9760 SW 344 St Homestead, FL 33035 L-2014-359Page 2 of 2Table ITurkey Point Units 3 and 4 LBLOCA Evaluation Model ErrorPeak Cladding CumulativeTemperature ChangeLBLOCA10 CFR 50.46 30-day Special Reports (Refs.1 & 2) 2121 OF 77 OF2014 ECCS Model Assessments 3 OF 3 OFDecay Group Uncertainty Factors ErrorsDecember 2014 30 Day Special Report 2124 OF 80 OF10 CFR 50.46(a)(3)(ii) also requires that a schedule for reanalysis be provided or compliance withthe requirements of the regulation be shown if the error is significant. For the Turkey Point Unitscontinued compliance with 10 CFR 50.46 requirements is demonstrated by the new estimatedLBLOCA PCT of 2124°F remaining below the limit of 22000F.Should there be any questions, please contact Robert Tomonto, Licensing Manager, at305-246-7327.Very truly yours,Michael KileyVice PresidentTurkey Point Nuclear Plantcc: Regional Administrator, Region II, USNRCSenior Resident Inspector, USNRC, Turkey Point Plant