L-2017-102, Submittal of 10 CFR 50.46 - Emergency Core Cooling 30-Day Report

Submittal of 10 CFR 50.46 - Emergency Core Cooling 30-Day Report

ML17158B347
Person / Time
Site:	Seabrook, Turkey Point
Issue date:	06/02/2017
From:	Larry Nicholson Florida Power & Light Co, NextEra Energy Seabrook
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-2017-102
Download: ML17158B347 (4)

Text

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June 2, 2017 L-2017-102 10 CFR 50.46(a)(3)(ii)

U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Florida Power & Light Company Turkey Point Units 3 and 4 Docket Nos. 50-250, 50-251 NextEra Energy Seabrook, LLC Seabrook Station Docket No. 50-443

Reference:

1. Letter NF-NEXT-17-88 from L. Sekkat to W. Rosette, and J. Perryman, dated May 12, 2017, "Turkey Point Units 3 and 4, Seabrook Unit 1, 10 CFR 50.46 Report for the Vessel Average Temperature Uncertainty" 10 CFR 50.46 - Emergency Core Cooling 30-Day Report In accordance with 10 CFR 50.46(a)(3)(ii), Florida Power & Light's Turkey Point Nuclear Plant (FPL), and NextEra Energy Seabrook, LLC (hereby referred to as NextEra), are submitting this 30-day report for the Turkey Point Nuclear Plant (PTN), Units 3 and 4, and Seabrook Station (SBK) for the emergency core cooling system (ECCS) analysis performed by Westinghouse Electric Company, LLC.

Per Reference 1, NextEra was informed of a hysteresis issue for plants with Weed Resistance Temperature Detectors that applies to the Reactor Coolant System (RCS) average temperature accident analysis initial condition uncertainty. This issue was evaluated as having a negligible impact on the Large and Small Break LOCA analysis results, leading to a Peak Clad Temperature (PCT) impact of 0°F.

Although there is no change to the PCT, this information is being submitted within 30 days of Westinghouse notification since both Turkey Point and Seabrook are above a cumulative change of 50°F. Enclosed are the peak cladding temperature "rack up sheets" for Turkey Point Units 3 and 4, and Seabrook showing a PCT impact of 0°F.

Florida Power & Light Company 700 Universe Boulevard, Juno Beach, FL 33408

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L-2017-102 Page 2 of2 This submittal contains no new commitments or revisions to existing commitments.

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Larry N~olson Director, Nuclear Licensing and Regulatory Compliance Enclosures (2) cc: Administrator, Region I, USNRC Administrator, Region II, USNRC Project Manager, Turkey Point Nuclear Plant, USNRC Project Manager, Seabrook Station, USNRC Resident Inspector, Turkey Point Nuclear Plant, USNRC

• Resident Inspector, Seabrook Station, USNRC

L-2017-102 Enclosure Page 1 Enclosure 1 Turkey Point Units 3 and 4 10 CFR 50.46 30-Day Report Peak Clad Cumulative LBLO CA Temperature Change 2016 10 CPR 50.46 Annual Report (I) 2124 °P 80 °F Changes I Errors

- Error in Vessel Average Temperature Uncertainty <2l 0 op Q op 2017 10 CFR 50.46 30-Day Report 2124 °F 80 °F SBLOCA 2016 10 CPR 50.46 Annual Report <1l 1231 °P 0 op Changes I Errors

- Error in Vessel Average Temperature Uncertainty <2l 0 op 0 op 2017 10 CFR 50.46 30-Day Report 1231 °F 0 °F References

1. Letter from L. Nicholson to U.S. Nuclear Regulatory Commission, "10 CPR 50.46 Annual Reporting of Changes to, or Errors in Emergency Core Cooling System Models or Applications," L-2017-014, April 17, 2017.

2. Letter L. Sekatt to W. Rosette, and J. Perryman, "Turkey Point Units 3 and 4, Seabrook Unit 1 10 CPR 50.46 Report for the Vessel Average Temperature Uncertainty," NF-NEXT-17-88, May 12, 2017.

L-2017-102 Enclosure Page 2 Enclosure 2 Seabrook Unit 1 10 CFR 50.46 30-Day Report Peak Clad Cumulative LBLOCA Temperature Change 2016 10 CPR 50.46 Annual Report (I) 1939 °P 155 °P Changes I Errors

- Error in Vessel Average Temperature Uncertainty <2l 0 op 0 op 2017 10 CFR 50.46 30-Day Report 1939 °F 155 °F SBLOCA 2016 10 CPR 50.46 Annual Report <1l 1373 °P 0 op Changes I Errors

- Error in Vessel Average Temperature Uncertainty <2l 0 op 0 op 2017 10 CFR 50.46 30-Day Report 1373 °F 0 °F References

1. Letter from L. Nicholson to U.S. Nuclear Regulatory Commission, "10 CPR 50.46 Annual Reporting of Changes to, or Errors in Emergency Core Cooling System Models or Applications," L-2017-014, April 17, 2017.

2. Letter L. Sekatt to W. Rosette, and J. Perryman, "Turkey Point Units 3 and 4, Seabrook Unit 1 10 CPR 50.46 Report for the Vessel Average Temperature Uncertainty," NF-NEXT-17-88, May 12, 2017.