NRC 2010-0092, ECCS Evaluation Model Changes
| ML101740064 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 06/21/2010 |
| From: | Jim Costedio Point Beach |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NRC 2010-0092 | |
| Download: ML101740064 (4) | |
Text
June 21,201 0 NRC 201 0-0092 10 CFR 50.46(a)(3)(ii)
U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Point Beach Nuclear Plant, Units I and 2 Dockets 50-266 and 50-301 Renewed License Nos. DPR-24 and DPR-27 ECCS Evaluation Model Changes In accordance with 10 CFR 50.46(a)(3)(iii), NextEra Energy Point Beach, LLC (NextEra) 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 I and 2. This letter provides a summary of ECCS evaluation model changes and errors identified since the previous annual report dated September 22,2009.
Enclosure I 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 2009. provides the small break LOCA margin summary sheet for 2009.
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).
This submittal contains no new commitments or revisions to existing commitments.
Very truly yours, NextEra Energy Point Beach, LLC James Costedio b-Licensing Manager 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, 66 10 Nuclear Road, Two Rivers, WI 5424 1
ENCLOSURE I NEXTERA ENERGY POINT BEACH, LLC POINT BEACH NUCLEAR PLANT, UNITS I AND 2 ECCS EVALUATION MODEL CHANGES AND ERRORS
References:
( 1 NextEra Energy Point Beach, LLC letter to NRC, dated September 22,2009, Annual Report of Changes to, and Errors Discovered in, Emergency Core Cooling System (ECCS) Evaluation Model Changes (ML092660684)
(2)
NRC letter to NextEra Energy Point Beach, LLC, dated October 29,2009, Issuance of Amendment Re: Use of ASTRUM for LBLOCA (ML092931684)
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 2009.
The report provides a summary of ECCS evaluation model changes and errors identified since the previous annual report dated September 22,2009 (Reference I). Westinghouse Electric Company is the analysis of record (AOR) holder for the large break and small break loss of coolant accident (LOCA) analyses for PBNP. Large break LOCA analysis is performed using the 2004 Westinghouse Realistic Large Break LOCA Evaluation Model using ASTRUM. 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 The large break LOCA analysis was reanalyzed using the 2004 Westinghouse Realistic Large Break LOCA Evaluation Model using ASTRUM, as approved by the NRC in Amendments 235 and 239 for Units I and 2 respectively on October 29, 2009 (Reference 2). There were no changes or errors in the new analysis during this reporting period that resulted in a change to the calculated peak cladding temperature (PCT). Enclosure 2 provides a summary of PCT changes for Units I 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 Units 1 and 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 2009 Evaluation Model:
2004 Westinghouse Realistic Large Break LOCA Evaluation Model using ASTRUM.
Evaluation Model PCT (Unit l / ~ n i t 2):
Net PCT Effect Absolute PCT Effect -
Unit l/Unit 2 Unit l/Unit 2 Prior 10 CFR 50.46 Changes or A
Error Corrections - up to Year 2008 APCT N/A*
NIA*
Prior 10 CFR 50.46 Changes or Errors Corrections - Year 2009 10 CFR 50.46 Changes in Year 2009 Since Item B APCT
+O°F/+OOF New Evaluation Model PCT Using ASTRUM Methodology APCT Absolute Sum of 10 CFR 50.46 Changes APCT 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 1975"FM 81 0°F < 2200°F analysis.
- The new Analysis of Record (AOR) was approved October 29, 2009. There were no changes or errors to the previous AOR since the last annual report and prior to the new AOR.
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ENCLOSURE 3 NEXTERA ENERGY POINT BEACH, LLC POINT BEACH NUCLEAR PLANT, UNITS I AND 2 SMALL BREAK LOCA MARGIN
SUMMARY
SHEET FOR 2009 Evaluation Model:
1985 Westinghouse Small Break LOCA Evaluation Model with NOTRUMP Evaluation Model PCT: I 157°F/10460F Net PCT Effect Absolute PCT Effect -
Unit l/Unit 2 Unit 1IUnit 2 Prior 10 CFR 50.46 Changes or A
Error Corrections - up to Year 2008 APCT
+48"F/+48"F
+48"F/+48"F Prior 10 CFR 50.46 Changes or Errors Corrections - Year 2009 10 CFR 50.46 Changes in Year 2009 Since Item B None Absolute Sum of 10 CFR 50.46 Changes APCT
+O°F/+OOF APCT N/A APCT 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"FM 094°F 2200 OF analysis.
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