L-2014-077, CFR 50.46, Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors - 30 Day Special Report

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

ML14098A469
Person / Time
Site:	Turkey Point
Issue date:	03/24/2014
From:	Kiley M Florida Power & Light Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-2014-077
Download: ML14098A469 (3)

Text

0IFPL. March 24, 2014 L-2014-077 10 CFR 50.46 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555-0001 Re: Turkey Point Unit 3 Docket No. 50-250 10 CFR 50.46, "Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors" - 30 Day Special Report

References:

1. FPL letter, M. Kiley to U. S. Nuclear Regulatory Commission, "Turkey Point Unit 3, Docket No. 50-250, 10 CFR 50.46, 'Acceptance Criteria for Emergency Core Cooling Systems in Light Water Nuclear Power Reactors' - 30 Day Special Report," L-2012-263, July 3, 2012.

2. 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.

3. 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.

10 CFR 50.46(a)(3)(ii) requires that changes to the Large Break Loss of Coolant Accident (LBLOCA) Evaluation Model (EM) and Small Break LOCA (SBLOCA) EM peak clad temperature (PCT) exceeding 50"F have to be reported to the NRC within 30 days. This letter meets this requirement.

FPL letter L-2012-263 (Reference 1), submitted the Turkey Point Unit 3 30-day special report documenting implementation of the Extended Power Uprate (EPU) for Unit 3. The revised LBLOCA PCT reported was 2164 OF with a cumulative change of 12 OF. The 12 OF change from the EPU EM LBLOCA PCT of 2152 °F was due to a mixed core penalty affecting the LBLOCA PCT due to the presence of the new 15xl 5 Upgrade fuel assemblies and the old 15x1 5 Debris Resistant Fuel Assemblies (DRFAs). The SBLOCA PCT reported was 1231 OF with a cumulative change of 0 °F. The SBLOCA PCT was not affected by the presence of a mixed core. The mixed core penalty was only applicable to Unit 3 Cycle 26 and any future cycles during which 15x15 DRFAs and 15x15 Upgrade fuel assemblies are both present in the core.

Unit 3 Cycle 27 consists of 15x15 Upgrade fuel assemblies only; therefore, the mixed core penalty does not apply during this cycle. This 30-day special report provides the LBLOCA PCT applicable to Unit 3 Cycle 27 and future cycles with only 15x15 Upgrade fuel assemblies. The SBLOCA PCT is not affected by the mixed core penalty; however, it is included in this report for completeness.

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

L-2014-077 Page 2 of 3 FPL letter L-2013-237 (Reference 2), submitted the Turkey Point Units 3 and 4 30-day special report documenting several errors in the Turkey Point LBLOCA EM regarding erroneous initial fuel pellet average temperature uncertainties and revised heat transfer multiplier distributions.

The initial fuel pellet average temperature uncertainties error correction resulted in a -54 OF change in PCT. The revised heat transfer multiplier distributions correction resulted in a +5 OF penalty. The LBLOCA PCT reported was 2115 OF with a cumulative change of 71 OF. The SBLOCA EM was not affected by this special report..

FPL letter L-2014-037 (Reference 3), submitted the Turkey Point Units 3 and 4 30-day special report documenting several errors in the Turkey Point LBLOCA EM related to calculation of the burst strain perform by the HOTSPOT code. Correction of the burst strain errors resulted in an 18 OF penalty in PCT. The revised LBLOCA PCT reported for Units 3 and 4 was 2133 OF with a cumulative change of 89 0 F due to the EM error. The SBLOCA EM was not affected by the identified error.

Table 1 below provides a summary of the LBLOCA and SBLOCA PCTs for Turkey Point Unit 3 Cycle 27 and future cycles with Upgrade fuel assemblies only. The LBLOCA PCT for Unit 3 is 2121 OF with a cumulative change of 770 F. The SBLOCA PCT is 1231 OF.

Table I Turkey Point Unit 3 LBLOCA and SBLOCA PCT Summary Peak Cladding Cumulative Temperature Change LBLOCA 10 CFR 50.46 30-day Special Report (Ref.1) 2164 OF 12 OF Mixed Core Penalty 10 CFR 50.46 30-day Special Report (Ref.2) 2115 OF 71 OF ECCS Model Assessments 10 CFR 50.46 30-day Special Report (Ref.3) 2133 OF 89 OF ECCS Model Assessments Unit 3 Cycle 27 and future cycles with only 2121 OF 77 OF Upgrade Fuel assemblies - (The 12 OF mixed core penalty no longer applies and has been removed)

Peak Cladding Cumulative Temperature Change SBLOCA EPU EM (Ref. 1) 1231 OF 0 OF

L-2014-077 Page 3 of 3 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. For Turkey Point Unit 3 continued compliance with 10 CFR 50.46 requirements is demonstrated by the new estimated LBLOCA PCT of 2121 OF and SBLOCA PCT of 1231 OF remaining below the limit of 22000 F.

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 cc: Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, Turkey Point Plant