L-2009-061, Submittal of Annual Report Acceptance Criteria for Emergency Core Cooling System Analyses for Light Water Nuclear Power Reactors

Submittal of Annual Report Acceptance Criteria for Emergency Core Cooling System Analyses for Light Water Nuclear Power Reactors

ML090771088
Person / Time
Site:	Saint Lucie
Issue date:	03/11/2009
From:	Katzman E Florida Power & Light Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-2009-061
Download: ML090771088 (4)

Text

Florida Power & Light Company, 6501 S. Ocean Drive, Jensen Beach, FL 34957 March 11, 2009 F=PL L-2009-061 10 CFR 50.46 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Re: St. Lucie Units 1 and 2 Docket Nos. 50-335 and 50-389 Acceptance Criteria for Emergency Core Cooling Systems for Light Water Nuclear Power Reactors 10 CFR 50.46 Annual Report Pursuant to 10 CFR 50.46(a)(3)(ii), the nature of any change to or error discovered in the evaluation models for emergency core cooling systems (ECCS), or in the application of such models, that affect the fuel cladding temperature calculations for St. Lucie Units 1 and 2 is reported in the attachment to this letter. The estimated effect from any such change or error on the limiting ECCS analysis for each unit is also addressed. The data interval for the report is from January 1, 2008 through December 31, 2008.

Please contact us should you have any questions regarding this submittal.

Sincerely, Eric S. Katzman Licensing Manager St. Lucie Plant ESK/KWF Attachment an FPL Group company

St. Lucie Units 1 and 2 L-2009-061 Docket Nos. 50-335 and 50-389 Attachment 10 CFR 50.46 Annual Report Page 1 of 3 St. Lucie Units I and 2 10 CFR 50.46 Annual Report Emergency core cooling system (ECCS) analyses for St. Lucie Unit I and St. Lucie Unit 2 are performed by AREVA and Westinghouse Electric Company (&), respectively. The following information pertaining to the evaluation models for small break loss of coolant accidents (SBLOCA) and large break loss of coolant accidents (LBLOCA), and the application of such models to each St. Lucie unit, is provided pursuant to 10 CFR 50.46(a)(3)(ii). A summary of calculated peak cladding temperature (PCT) changes is provided in Table 1. The data interval for this report is from January 1, 2008 through December 31, 2008.

1.0 ST LUCIE UNIT 1 1.1 One error was found in the SBLOCA ECCS performance analysis since the previous report of Reference 3.1 and is described below. Table 1 summarizes the estimated impact of this error on the St. Lucie Unit I SBLOCA PCT. The limiting SBLOCA PCT is now 1758°F.

Programming code error in RELAP5 A legacy code error in RELAP5 for the SBLOCA analysis was discovered which resulted in the PCT being lowered by 8 'F. The error was related to incorrect indexing in summations that compute the terms for delayed neutron fractions.

1.2 No errors were found in the LBLOCA ECCS performance analysis since the previous report of Reference 3.2. The limiting LBLOCA PCT remains at 20590 F.

A 30 day 10 CFR 50.46 report was issued in 2008 and is listed in Reference 3.2.

2.0 ST. LUCIE UNIT 2 2.1 No errors were found in the SBLOCA ECCS performance analysis since the previous report of Reference 3.1. The limiting SBLOCA PCT remains at 1943' F.

2.2 No errors were found in the LBLOCA ECCS performance analysis since the previous report of Reference 3.1. The limiting LBLOCA PCT remains at 21300 F.

3.0 REFERENCES

3.1 FPL Letter L-2007-040, Gordon L. Johnston. to USNRC Document Control Desk, St. Lucie Units I and 2, Docket Nos. 50-335 and 50-389, Acceptance Criteria for Emergency Core Cooling Systems for Light Water Nuclear Power Reactors: 10 CFR 50.46 Annual Report, March 22, 2007.

3.2 FPL Letter L-2008-254, Eric Katzman to U.S. Nuclear Regulatory Commission Document Control Desk, "St. Lucie Unit 1 Docket No. 50-335 Acceptance Criteria for Emergency Core Cooling Systems for Light Water Nuclear Power Reactors 10 CFR 50.46 Change Report,"

December 4, 2008.

St. Lucie Units 1 and 2 L-2009-061 Docket Nos. 50-335 and 50-389 Attachment 10 CFR 50.46 Annual Report Page 2 of 3 Table 1: 2008 St. Lucie Units 1 and 2 SBLOCA and LBLOCA PCT Summary Unit I SBLOCA Summary Evaluation Model: EMF-2328(P)(A), Revision 0 Evaluation Model PCT: 1765 OF Absolute PCT Net PCTEffect Effect A Prior 10 CFR 50.46 Changes or Error APCT +1 OF +3 OF Corrections - Previous Years B Prior 10 CFR 50.46 Changes or Errors APCT 0 OF +0 OF Corrections - Year 2008 C C Item B 50.46 Changes in Year 2008 Since 10 CFR APCT (see below) (see below)

RELAP5 Programming Code Error APCT -8 OF +8 °F D Absolute Sum of 10 CFR 50.46 Changes APCT +11 °F The sum of the PCTfrom the most recent analysis using an acceptable evaluationmodel and the estimates of PCT impactfor 1758 OF < 2200 OF changes and errors identifiedsince this analysis Unit 1 LBLOCA Summary Evaluation Model: EMF-2087(P)(A), Revision 0 Evaluation Model PCT: 2005 OF Absolute PCT Net PCT Effect Effect A Prior 10 CFR 50.46 Changes or Error APCT +42 OF +44 OF Corrections - Previous Years B Prior 10 CFR 50.46 Changes or Errors APCT +12 OF +56 OF*

Corrections - Year 2008 C 10 CFR 50.46 Changes in Year 2008 Since APCT 0 °F +56 °F Item B D Absolute Sum of 10 CFR 50.46 Changes APCT +56 OF The sum of the PCTfrom the most recent analysis using an acceptable evaluation model and the estimates of PCT impactfor 2059 OF < 2200 OF changes and errors identified since this analysis

• Reference 3.2 contains a 30 day report related to this cumulative PCT.

St. Lucie Units 1 and 2 L-2009-061 Docket Nos. 50-335 and 50-389 Attachment 10 CFR 50.46 Annual Report Page 3 of 3 Unit 2 SBLOCA Summary Evaluation Model: CENPD-137, Supplement 2-P-A Evaluation Model PCT: 1943 IF Absolute PCT Net PCT Effect Effect Prior 10 CFR 50.46 Changes or Error APCT 0 OF +0 OF Corrections - Previous Years Prior 10 CFR 50.46 Changes or Errors APCT 0 OF +0 OF Corrections - Year 2008 10 CFR 50.46 Changes in Year 2008 Since APCT 0 OF +0 OF Item B D j Absolute Sum of 10 CFR 50.46 Changes I APCT +0 OF The sum of the PCTfrom the most recent analysis using an acceptable evaluation model and the estimates of PCT impactfor 1943 OF < 2200 OF changes and errors identified since this analysis Unit 2 LBLOCA Summary Evaluation Model: CENPD-132, Supplement 4-P-A (from 2001)

Evaluation Model PCT: 2130 IF Absolute PCT Net PCT Effect Effect A Prior 10 CFR 50.46 Changes or Error APCT 0 OF +0 OF Corrections - Previous Years B Prior 10 CFR 50.46 Changes or Errors APCT 0 OF +0 OF Corrections - Year 2008 C 10 CFR 50.46 Changes in Year 2008 Since APCT 0 OF +0 OF Item B D Absolute Sum of 10 CFR 50.46 Changes APCT +0 OF The sum of the PCTfrom the most recent analysis using an acceptableevaluation model and the estimates of PCT impactfor 2130 OF < 2200 OF changes and errors identified since this analysis