L-2014-084, 10 CFR 50.46, Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors - 2013 Annual Report and 30-Day Special Report

10 CFR 50.46, Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors - 2013 Annual Report and 30-Day Special Report

ML14126A785
Person / Time
Site:	Turkey Point
Issue date:	04/16/2014
From:	Kiley M Florida Power & Light Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-2014-084
Download: ML14126A785 (5)

Text

SApril 16, 2014 L-2014-084 FPL. 10 CFR 50.46 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555-0001 Re: Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 10 CFR 50.46, "Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors" - 2013 Annual Report and 30-Day Special Report

References:

1. FPL letter from Michael Kiley to U.S. NRC Document Control Desk, "Turkey Point Units 3 and 4, Docket Nos. 50-250 and 50-251, 10 CFR 50.46, 'Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors' - 2012 Annual Report," L-2013-108, April 29, 2013.

2. FPL letter, Michael Kiley to U. S. Nuclear Regulatory Commission, "Turkey Point Unit 4, Docket No. 50-251, 10 CFR 50.46, 'Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors' - 30 Day Special Report," L-2013-032, February 11, 2013.

3. FPL letter from Michael Kiley to U.S. NRC Document Control Desk, "Turkey Point Units 3 and 4, Docket Nos. 50-250 and 50-251, 10 CFR 50.46, 'Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors' - 30 Day Special Report," L-2013-237, August 20, 2013.

4. FPL letter, M. Kiley to U. S. Nuclear Regulatory Commission, "Turkey Point Units 3 and 4, Dockets Nos. 50-250 and 50-251, 10 CFR 50.46, 'Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors' - 30 Day Special Report,"

L-2014-037 February 18, 2014.

5. Westinghouse letter from E. Malek to R. Klein, "Florida Power and Light Company, Turkey Point Units 3 & 4, 10 CFR 50.46 Report for the HOTSPOT Burst Strain Error Correction," NF-FP-14-9, January 31, 2014.

6. Westinghouse letter from E. Malek to R. Klein, "Florida Power and Light Company, Turkey Point Units 3 & 4, 10 CFR 50.46 Annual Notification and Reporting for 2013,"

NF-FP-14-50, March 18, 2014.

Florida Power & Light Company 9760 SW 344 St Homestead, FL 33035 r

L-2014-084 Page 2 of 3 10 CFR 50.46 2013 Annual Report 10 CFR 50.46(a)(3)(ii) requires that licensees report to the Commission at least annually the nature of changes to, or errors discovered in, the Emergency Core Cooling System (ECCS) evaluation models (EM), or in the application of such models that affect the peak clad temperature calculation and their effect on the limiting ECCS analysis. Table 1 of the attachment to this letter provides the Florida Power and Light Company (FPL) 10 CFR 50.46 Peak Cladding Temperature (PCT) 2013 reports for Turkey Point Units 3 and 4.

FPL letter L-2013-108 (Reference 1), submitted the 2012 10 CFR 50.46 annual report. The 2012 annual report documented the Extended Power Uprate (EPU) LBLOCA PCT of 2164°F and EPU SBLOCA PCT of 1231 OF for Turkey Point Unit 3. The 2012 annual report documented the Pre-EPU LBLOCA PCT of 1917OF and Pre-EPU SBLOCA PCT of 1689 0 F for Turkey Point Unit 4.

FPL letter L-2013-032 (Reference 2), submitted the 30-day special report updating the Turkey Point Unit 4 LBLOCA and SBLOCA PCTs as a result of EPU implementation. The special report documented an EPU LBLOCA PCT of 2164°F and EPU SBLOCA PCT of 1231'F for Turkey Point Unit 4.

FPL letter L-2013-237 (Reference 3) submitted the Turkey Point Units 3 and 4 30-day special report documenting several errors in the LBLOCA EM for 2013. The LBLOCA PCT reported for Turkey Point Units 3 and 4 was 2115°F with a cumulative change of 71°F. The SBLOCA EM was not affected by the identified errors.

Table 1 of the attachment to this letter provides the Turkey Point Units 3 and 4 2013 Annual Summary listing all the changes and errors identified by Westinghouse in 2013 in the LBLOCA and SBLOCA EMs. Based on Table 1 of the attachment to this letter, the 2013 Turkey Point Units 3 and 4 LBLOCA and SBLOCA PCTs are 2115OF and 1231 OF, respectively. The PCT cumulative changes are 71 OF for LBLOCA and 0 OF for SBLOCA, respectively.

10 CFR 50.46(a)(3)(ii) also requires that a schedule for reanalysis be provided or compliance with the requirements of the regulation be shown if the error is significant. Compliance with 10 CFR 50.46 requirements is demonstrated by total estimated LBLOCA and SBLOCA PCTs of 2115'F and 1231 OF, respectively, both remaining below the limit of 2200 0 F.

10 CFR 50.46 30-Day Special Report FPL letter L-2014-037 (Reference 4) submitted the Turkey Point Units 3 and 4 30-day special report documenting the LBLOCA EM error identified by Westinghouse in 2013 and reported to FPL by letter dated January 31, 2014 (Reference 5). The LBLOCA EM error in the calculation of the burst strain performed by the HOTSPOT code resulted in an estimated PCT impact of

+18 0 F. The LBLOCA PCT reported for Turkey Point Units 3 and 4 was 2133°F with a cumulative change of 89°F due to the EM error. The SBLOCA EM was not affected by the identified errors.

On March 18, 2014 (Reference 6), Westinghouse identified several LBLOCA errors not previously reported. The EM errors had a 0 °F impact in the LBLOCA PCT. Table 2 of the attachment to this letter provides the Units 3 and 4 30-day special report for the LBLOCA EM

L-2014-084 Page 3 of 3 errors identified by Reference 6. The LBLOCA PCT reported for Turkey Point Units 3 and 4 is 2133°F with a cumulative change of 89 0 F due to the EM errors.

10 CFR 50.46(a)(3)(ii) requires that changes to the LBLOCA EM and SBLOCA EM PCTs exceeding 50°F be reported to the NRC within 30 days. In accordance with 10 CFR 50.46(a)(3)(ii), Table 2 of the attachment to this letter meets the 30-day reporting requirement for the LBLOCA EM error not previously reported.

10 CFR 50.46(a)(3)(ii) also requires that a schedule for reanalysis be provided or compliance with the requirements of the regulation be shown if the error is significant. Compliance with 10 CFR 50.46 requirements is demonstrated by total estimated LBLOCA PCT of 2133°F remaining below the limit of 22000F.

Should there be any questions, please contact Robert Tomonto, Licensing Manager, at 305-246-7327.

Very truly yours, Michael Kiley Vice President Turkey Point Nuclear Plant Attachment cc: Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, Turkey Point Plant

Attachment 1 to L-2014-084 Page 1 of 2 TABLE 1 TURKEY POINT UNITS 3 AND 4 LBLOCA AND SBLOCA PCT 2013 ANNUAL

SUMMARY

Peak Cladding Cumulative Temperature Change LBLOCA EPU Evaluation Model (A1,A2) 2152 OF 0 OF

- Temporary Mixed Core Penalty(Al. A2) 12 OF 12 OF Evaluations & Assessments Reported for 201 3 (A3)

- Initial Fuel Pellet Tavg Uncertainty Calculation -54 OF 54 OF

- Heat Transfer Model Error Corrections 0 OF 0 OF

- Heat Transfer Node Initialization Correction 0 OF 0 OF

- Mass Conservation Error Fix 0 OF 0°F

- Split Channel Momentum Equation Correction 0 OF 0 OF

- Changes to Vessel Superheated Steam Properties 0 OF 0 OF

- Update to Metal Density Reference Temperatures 0 OF 0 OF

- Decay Heat Model Error Corrections 0 OF 0°F

- Pipe Exit Pressure Drop Error Correction 0 OF 0 OF

- Revised Heat Transfer Multiplier Distributions +5 OF 5 OF 2013 10 CFR 50.46 Annual Report 2115 OF 71 OF Peak Cladding Cumulative Temperature Change SBLOCA EPU New Evaluation Model (A, A2) 1231 OF 0 OF Evaluations & Assessments Reported for 201 3 (A5)

- SBLOCTA Cladding Strain Requirement for Fuel Rod Burst 0 OF 0 OF

- Evaluation of Error in Former Plate Flow Hole Equivalent Diameters and Upper Support Plate Flow Area 0 OF 0 OF 2013 10 CFR 50.46 Annual Report 1231 OF 0 OF

Attachment to L-2014-084 Page 2 of 2 TABLE 2 TURKEY POINT UNITS 3 AND 4 LBLOCA 30-DAY SPECIAL REPORT Peak Cladding Cumulative Temperature Change LBLOCA 2013 10 CFR 50.46 Annual Report (Table 1) 2115 OF* 71 OF Reported Assessment (A4)

- Error in Burst Strain Application +18 OF 18 OF New Evaluations & Assessments/30-Day Report(AS)

- Grid Heat Transfer Enhancement Calculation 0 OF 0 OF

- Changes to Grid Blockage Ratio and Porosity 0 OF 0 OF

- Vessel Section 7 Mid-Level Elevation Modeling 0 OF 0 OF April 2014 10 CFR 50.46 Report 2133 OF 89 OF

• This PCT includes a 12 OF mixed core penalty which will go away for Unit 3 when Cycle 27 starts in late April 2014 and for Unit 4 when Cycle 28 starts in October 2014.

REFERENCES Al. FPL letter, M. Kiley to U. S. Nuclear Regulatory Commission, "Turkey Point Units 3 and 4, Dockets Nos. 50-250 and 50-251, 10 CFR 50.46, 'Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors'- 2012 Annual Report,"

L-2013-108, April 29, 2013.

A2. FPL letter, M. Kiley to U. S. Nuclear Regulatory Commission, "Turkey Point Unit 4, Docket No. 50-251, 10 CFR 50.46, 'Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors'- 30 Day Special Report," L-2013-032, February 11, 2013.

A3. FPL letter, M. Kiley to U. S. Nuclear Regulatory Commission, "Turkey Point Units 3 and 4, Dockets Nos. 50-250 and 50-251, 10 CFR 50.46, 'Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors' - 30 Day Special Report,"

L-2013-237, August 20, 2013.

A4. FPL letter, M. Kiley to U. S. Nuclear Regulatory Commission, "Turkey Point Units 3 and 4, Dockets Nos. 50-250 and 50-251, 10 CFR 50.46, 'Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors' - 30 Day Special Report,"

L-2014-037 February 18, 2014.

A5. Westinghouse letter from E. Malek to R. Klein, "Florida Power and Light Company, Turkey Point Units 3 & 4, 10 CFR 50.46 Annual Notification and Reporting for 2013," NF-FP 50, March 18, 2014.