ML110970146

Units I and 2, Acceptance Criteria for Emergency Core Cooling Systems for Light Water Nuclear Power Reactors 10 CFR 50.46 Annual Report

ML110970146
Person / Time
Site:	Saint Lucie
Issue date:	03/30/2011
From:	Katzman E Florida Power & Light Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML110970146 (5)

Text

0 Florida Power & Light Company, 6501 S. Ocean Drive, Jensen Beach, FL 34957 March 30, 2011 IFPL L-2011-123 10 CFR 50.46 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Re: 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 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, 2010 through December 31, 2010.

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

Sincerely, Eric S. Katzman Licensing Manager St. Lucie Plant ESK/KWF Attachment 00D-an FPL Group company

L-2011-123 Attachment Page 1 of 4 St. Lucie Units 1 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 (W), 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 1,2010 through December 31, 2010. A discussion of the changes follows.

1.0 ST LUCIE UNIT I 1.1 Changes to SBLOCA 1.1.1 No errors were found in the SBLOCA ECCS performance analysis since the previous report of Reference 3.1. The limiting SBLOCA PCT remains at 1702 'F and is documented in Table I.

1.2 Changes to LBLOCA 1.2. i No errors were found in the LBLOCA ECCS performance analysis since the previous report of Reference 3.1. The limiting LBLOCA PCT remains at 2079 'F and is documented in Table 1.

2.0 ST. LUCIE UNIT 2 2.1 Changes to SBLOCA 2.1 .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 19430 F and is documented in Table 1.

2.2 Changes to LBLOCA 4.1 There was one change to the St. Lucie Unit 2 LBLOCA ECCS performance analysis during the Year 2010, as described below:

Increase in the Maximum Containment Spray Flow The maximum containment spray flow used in the LBLOCA analysis was increased from 3450 gpm/pump to 3650 gpm/pump to cover a higher calculated flow in the analysis. The impact of this flow increase was estimated to be 107F.

L-2011-123 Attachment Page 2 of 4

3.0 REFERENCES

3.1 FPL Letter L-2010-067, Eric Katzman to U.S. Nuclear Regulatory Commission 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 30, 2010 3.2 FPL Letter L-2009-277, Eric Katzman to U.S. Nuclear Regulatory Commission Document Control Desk, "St. Lucie Unit I Docket No. 50-335 Acceptance Criteria for Emergency Core Cooling Systems for Light Water Nuclear Power Reactors 10 CFR 50.46 Change Report," November 30, 2009.

L-2011-123 Attachment Page 3 of 4 Table 1: 2010 St. Lucie Units I and 2 SBLOCA and LBLOCA PCT Summary Unit 1 SBLOCA Summary Evaluation Model: XN-NF-82-49(P)(A), Revision 1, Supplement I Evaluation Model PCT: 1765 0 F Absolute PCT Net PCT Effect Effect A Prior 10 CFR 50.46 Changes or Error APCT -63 OF 83 OF*

Corrections - Previous Years B Prior 10 CFR 50.46 Changes or Errors APCT 0 OF 0 OF Corrections - Year 2010 C 10 CFR 50.46 Changes in Year 2010 APCT 0 OF 0 OF Since Item B D Absolute Sum of 10 CFR 50.46 Changes APCT 83 OF The sum of the PCTfrom the most recent analysis using an acceptable evaluation model and the estimates of PCT impactfor 1702OF < 2200OF changes and errors identified since this analysis Unit 1 LBLOCA Summary Evaluation Model: EMF-2087(P)(A), Revision 0 Evaluation Model PCT: 2005OF Absolute PCT Net PCT Effect EffeCT Effect A Prior 10 CFR 50.46 Changes or Error APCT +74 OF 76 OF*

Corrections - Previous Years B Prior 10 CFR 50.46 Changes or Errors APCT 0 OF 0 0F Corrections - Year 2010 C 10 CFR 50.46 Changes in Year 2010 APCT 0 OF 0 OF Since Item B D Absolute Sum of 10 CFR 50.46 Changes APCT 76 0 F The sum of the PCTfrom the most recent analysis using an acceptable evaluation model and the estimates of PCT impact for 2079OF < 2200OF changes and errorsidentified since this analysis

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

L-2011-123 Attachment Page 4 of 4 Unit 2 SBLOCA Summary Evaluation Model: CENPD-137, Supplement 2-P-A Evaluation Model PCT: 1943 0 F 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 2010 C 10 CFR 50.46 Changes in Year 2010 APCT 0 OF 0 OF Since 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 acceptable evaluation model and the estimates of PCT impactfor 1943 0 F < 2200OF changes and errors identified since this analysis Unit 2 LBLOCA Summary Evaluation Model: CENPD-132, Supplement 4-P-A (1999 EM)

Evaluation Model PCT: 2104OF Absolute PCT Net PCT Effect EffeCT Effect A Prior 10 CFR 50.46 Changes or Error APCT -4 OF 4 OF Corrections - Previous Years B Prior 10 CFR 50.46 Changes or Errors APCT 0 OF 0 OF Corrections - Year 2010 C 10 CFR 50.46 Changes in Year 2010 APCT (see below) (see below)

Since Item B Increase in max containment spray flow APCT +10 OF 10 OF D Absolute Sum of 10 CFR 50.46 Changes APCT 14 OF The sum of the PCTfrom the most recentanalysis using an acceptable evaluation model and the estimates of PCT impactfor 2110OF < 2200OF changes and errors identified since this analysis