NRC 2009-0100, Annual Report of Changes to, and Errors Discovered in, Emergency Core Cooling System (ECCS) Evaluation Model Changes

Annual Report of Changes to, and Errors Discovered in, Emergency Core Cooling System (ECCS) Evaluation Model Changes

ML092660684
Person / Time
Site:	Point Beach
Issue date:	09/22/2009
From:	Jim Costedio Point Beach
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NRC 2009-0100
Download: ML092660684 (4)

Text

September 22, 2009 NRC 2009-0100 I0 CFR 50.46(a)(3)(ii)

U.S. Nuclear Regulatory Commission AlTN: Document Control Desk Washington, DC 20555 Point Beach Nuclear Plant, Units 1 and 2 Dockets 50-266 and 50-301 Renewed License Nos. DPR-24 and DPR-27 ECCS Evaluation Model Changes NextEra Energy Point Beach (NextEra), LLC, is submitting this annual report of changes to, and errors discovered in, emergency core cooling system (ECCS) evaluation models for Point Beach Nuclear Plant (PBNP), Units 1 and 2. This letter provides a summary of ECCS evaluation model changes and errors identified since the previous annual report dated June 16,2008.

Enclosure 1 describes the ECCS evaluation model changes and errors for the large and small break LOCA. Enclosure 2 provides the large break LOCA margin summary sheet for 2008.

Enclosure 3 provides the small break LOCA margin summary sheet for 2008.

There were no changes or errors to the large break or small break LOCA evaluation models during this reporting period that resulted in a change to the calculated peak clad temperature (PCT) for PBNP.

This submittal contains no new commitments or revisions to existing commitments.

Very truly yours, NextEra Energy Point Beach, LLC R-.-

V James Costedio Licensing Manager Point Beach Nuclear Plant Enclosures cc: Administrator, Region Ill, USNRC Project Manager, Point Beach Nuclear Plant, USNRC Resident Inspector, Point Beach Nuclear Plant, USNRC NextEra Energy Point Beach, LLC, 6610 Nuclear Road, Two Rivers, WI 54241

ENCLOSURE I NEXTERA ENERGY POINT BEACH, LLC POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 ECCS EVALUATION MODEL CHANGES AND ERRORS This is the annual report of changes to, and errors discovered in, emergency core cooling system (ECCS) evaluation models for Point Beach Nuclear Plant (PBNP) Units 1 and 2, for the Year 2008.

The report provides a summary of ECCS evaluation model changes and errors identified since the previous annual report dated June 16, 2008. Westinghouse Electric Company is the analysis of record holder for PBNP Units 1 and 2 large break and small break loss of coolant accident (LOCA) analyses, Large break LOCA analysis is performed using the 1999 Westinghouse Best Estimate Large Break LOCA Evaluation Model, application to PWRs with upper plenum injection. The small break LOCA analysis is performed using the 1985 Westinghouse Small Break LOCA Evaluation Model with NOTRUMP.

LARGE BREAK LOCA ECCS EVALUATION MODEL CHANGES AND ERRORS There were no changes or errors to the large break LOCA evaluation model during this reporting period that resulted in a change to the calculated peak clad temperature (PCT) for PBNP. provides a summary of PCT changes for PBNP Units 1 and 2.

SMALL BREAK LOCA ECCS EVALUATION MODEL CHANGES AND ERRORS There were no changes or errors to the small break LOCA evaluation model during this reporting period that resulted in a change to the calculated PCT for PBNP. Enclosure 3 provides a summary of PCT changes for PBNP Units Iand 2.

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ENCLOSURE 2 NEXTERA ENERGY POINT BEACH, LLC POINT BEACH NUCLEAR PLANT, UNITS I AND 2 LARGE BREAK LOCA MARGIN

SUMMARY

SHEET FOR 2008 Evaluation Model: 1999 Westinghouse Best Estimate Large Break LOCA Evaluation Model, application to PWRs with Upper Plenum Injection Evaluation Model PCT: 2128°F Net PCT

~ffect -

Effect Prior 10 CFR 50.46 Changes or A Error Corrections - up to Year 2007 APCT +3"F Prior 10 CFR 50.46 Changes or APCT +O°F Errors Corrections - Year 2008 10 CFR 50.46 Changes in Year 2008 Since Item B None APCT NIA NIA Absolute Sum of 10 CFR 50.46 APCT + I 21OF Changes The sum of the PCT from the most recent analysis using an acceptable evaluation model and the estimates of PCT impact for changes and errors identified since this analysis Page 1 of 1

ENCLOSURE 3 NEXTERA ENERGY POINT BEACH, LLC POINT BEACH NUCLEAR PLANT, UNITS I AND 2 SMALL BREAK LOCA MARGIN

SUMMARY

SHEET FOR 2008 Evaluation Model: 1985 Westinghouse Small Break LOCA Evaluation Model with NOTRUMP Evaluation Model PCT: 1157°Fl10460F Net Absolute PCT PCT

~ffect ~ffect Prior 10 CFR 50.46 Changes or A APCT +48"F1+48"F +48"F1+48"F Error Corrections - up to Year 2007 Prior 10 CFR 50.46 Changes or APCT +O°FI+OOF Errors Corrections - Year 2008 10 CFR 50.46 Changes in Year 2008 Since Item B None APCT NIA NIA Absolute Sum of 10 CFR 50.46 APCT Changes The sum of the PCT from the most recent analysis using an acceptable evaluation model and the estimates of PCT impact for changes and errors identified since this 1205°Fll094°F : 2200 OF analysis Page 1 of I