ML18136A738

Emergency Core Cooling System (ECCS) Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for Calendar Year 2017

ML18136A738
Person / Time
Site:	Palo Verde
Issue date:	05/16/2018
From:	Dilorenzo M Arizona Public Service Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
102-07711-MDD/MSC
Download: ML18136A738 (15)

Text

10 CFR 50.46(a)(3)(ii)

Qaps Palo Verde Nuclear Generating Station 5871 S. Wintersburg Road 102-07711-MDD/MSC Tonopah, AZ 85354 May 16, 2018 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Palo Verde Nuclear Generating Station Units 1, 2, and 3 Docket Nos. STN 50-528/529/530 Emergency Core Cooling System (ECCS) Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for Calendar Year 2017 Pursuant to 10 CFR 50.46(a)(3)(ii), Arizona Public Service Company (APS) is providing a summary of the cumulative effects on calcuiated peak cladding temperature (PCT) for the Palo Verde Nuclear Generating Station (PVNGS) due to changes or errors in ECCS performance evaluation models.

There were no changes or errors that affected PCT in either the large break loss of coolant accident (LOCA) or the small break LOCA calculations for PVNGS Units 1, 2, and 3 for calendar year 2017. Additionally, because PCT is not calculated as part of the post-LOCA long-term cooling (LTC) analysis, there are no changes or errors in the LTC models that affect PCT.

The enclosures provide a more detailed discussion of the absolute PCT effects in the Westinghouse (formerly Combustion Engineering) models for pressurized water reactors ECCS performance analyses in calendar year 2017 for PVNGS.

No commitments are being made to the NRC by this letter. Should you need further information regarding this submittal, please contact, Matthew S. Cox, Licensing Section Leader, at (623) 393-5753.

Sincerely, Michael D. DiLorenzo Department Leader, Regulatory Affairs MDD/MSC/CJS A member of the STARS Alliance LLC Callaway

• Diablo Canyon

• Palo Verde

• Wolf Creek

102-07711-MDD/MSC ATTN; Document Control Desk U. S. Nuclear Regulatory Commission ECCS Performance Evaluation Models, 10 CFR 50.46(a)(3)(ii) Annual Report for 2017 Page 2 : Summary of Cumulative Effects on Calculated Peak Clad Temperature (PCT) for PVNGS Due to Changes/Errors In Emergency Core Cooling System (ECCS) Performance Evaluation Models : Westinghouse Electric Company Letter, Palo Verde Nuclear Generating Station Units 1, 2, and 3, 10 CFR 50.46 Annual Notification and Reporting for 2017, letter number LTR-SATH-18-006, dated May 4, 2018 cc:

K. M. Kennedy NRC Region IV Regional Administrator M. D. Orenak NRC NRR Project Manager for PVNGS M. M. Watford NRC NRR Project Manager C. A. Peabody NRC Senior Resident Inspector for PVNGS

Enclosure 1 Summary of Cumulative Effects on Calculated Peak Clad Temperature (PCT) for PVNGS Due to Changes/Errors in Emergency Core Cooling System (ECCS) Performance Evaluation Models

Enclosure 1 Summary of Cumulative Effects on Calculated PCT for PVNGS Due to Changes/Errors in ECCS Performance Evaluation Models Table 1: Large Break LOCA Margin Summary Sheet for 2017 Plant Name: Palo Verde Nuclear Generating Station Units 1, 2, and 3 Utility Name: Arizona Public Service Company (APS)

Evaluation Model: Westinghouse (formerly Combustion Engineering) 1999 EM Peak Clad Temperature: 2106 °F (analysis of record reported in PVNGS UFSAR Section 6.3.3)

Net PCT Absolute PCT Effect Effect A. Cumulative 10 CFR 50.46 Changes and APCT = + 0 °F + 0 °F Error Corrections - Previously Reported B. 10 CFR 50.46 Changes and Error Corrections - New for CY 2017

1. None Identified for Units 1, 2 and 3 APCT = + 0 °F + 0 °F APCT = + 0 °F Changes and Error Corrections D. Licensing Basis PCT (Reported in UFSAR) 2106 °F

+ Cumulative PCT Assessments (Changes and Error Corrections)

Note: PVNGS reanalyzed the Large Break LOCA event with an NRC approved Evaluation Model in 2009, as reported in Letter No. 102-06113, 30-Day Report Pursuant to 10 CFR 50.46(a)(3)(H) and Submittal of Large Break Loss of Coolant Accident Reanalysis Results, dated December 22, 2009 (NRC ADAMS Accession No. ML100040066). The reanalysis incorporated and corrected previously identified changes and errors, resetting the cumulative changes and error corrections that had previously been reported through the end of CY 2008 (NRC ADAMS Accession No. ML091810703).

The sum of the PCT from the most recent analysis of record (AOR) using an acceptable evaluation model, and the estimated cumulative effects of PCT impacts for changes and error corrections made since that AOR, remains less than 2200 °F.

Enclosure 1 Summary of Cumulative Effects on Calculated PCT for PVNGS Due to Changes/Errors in ECCS Performance Evaluation Models Table 2: Small Break LOCA Margin Summary Sheet for 2017 Plant Name: Palo Verde Nuclear Generating Station Units 1, 2, and 3 Utility Name: Arizona Public Service Company (APS)

Evaluation Model: Westinghouse (formerly Combustion Engineering) S2M Peak Clad Temperature: 1618°F (analysis of record reported in PVNGS UFSAR Section 6.3.3)

Net PCT Absolute PCT Effect Effect A. Cumulative 10 CFR 50.46 Changes and APCT = + 0 °F + 0 °F Error Corrections - Previously Reported B. 10 CFR 50.46 Changes and Error Corrections - New for CY 2017

1. None Identified APCT = + 0 °F + 0 °F C. Absolute Sum of Cumulative 10 CFR 50.46 APCT = + 0 °F Changes and Error Corrections D. Licensing Basis PCT (Reported in UFSAR) + 1618 °F Cumulative PCT Assessments (Changes and Error Corrections)

The sum of the PCT from the most recent AOR using an acceptable evaluation model, and the estimated cumulative effects of PCT impacts for changes and error corrections made since that AOR, remains less than 2200 °F.

Enclosure 2 Westing house Electric Company Letter, Palo Verde Nuclear Generating Station Units 1, 2, and 3, 10 CFR 50.46 Annual Notification and Reporting for 2017, letter number LTR-SATH-18-006, dated May 4, 2018

Westinghouse Non-Proprietary Class 3 Westinghouse Electric Company 20 International Drive Windsor, Connecticut 06095 Westinghouse USA Direct tel: (860)731-6508 e-mail: parikha@westinghouse.com Our ref: LTR-SATH-18-006, Rev.O May 4, 2018 Palo Verde Nuclear Generating Station Units 1, 2, and 3 10 CFR 60.46 Annual Notification and Reporting for 2017

Dear Sir or Madam:

This letter provides 10 CFR 50.46 reporting information pertaining to the Westinghouse Electric Company emergency core cooling system (ECCS) performance evaluation models (EMs) and their application to your plants for calendar year 2017.

There were no 2017 changes, error corrections, or enhancements to the 1999 EM, which is the EM used in your plants large break loss of coolant accident (LBLOCA) ECCS performance analysis. Additionally, there were no 2017 changes, error corrections, or enhancements to the Supplement 2 evaluation model (S2M), which is the EM used in your plants small break loss of coolant accident (SBLOCA) ECCS performance analysis.

The peak cladding temperature (PCT) rackup sheets, along with your plants specific evaluation text, are enclosed in the attachment. The rackup sheets identify the PCTs of the ECCS performance analyses of record (AOR) for your plants and the PCT assessments associated with the AOR through the end of calendar year 2017. There are no PCT changes on the Units 1, 2 and 3 LBLOCA AOR and Units 1, 2 and 3 SBLOCA AOR for 2017.

This letter is provided for your use in making a determination relative to the reporting requirements of 10 CFR 50.46. The information provided in this letter was prepared in accordance with Westinghouse's Quality Management System.

• Electronically approved records are authenticated in the eiectronic document management system.

© 2018 Westinghouse Electric Company LLC All Rights Reserved

• • • This record was final approved on 5/4/2018 3:31:04 PM. (This statement was added by the PRIME system upon Its validation)

Westinghouse Non-Proprietary Class 3 LTR-SATH-18-006, Rev. 0 Page 2 of 2 May 4, 2018 Author; (Electronically Approved)* Verifier: (Electronically Approved)*

Ajal J. Parikh Teresa A. Gancarz Setpoints and Advanced SATH Thermal Hydraulics (SATH)

Approved: (Electronically Approved)*

John Ghergurovich Manager, SATH RACKUP SharePoint Check:

EMs applicable to Palo Verde Nuclear Generating Station Units 1, 2, and 3:

Appendix K Small Break - S2M Appendix K Large Break - 1999 EM 2017 Issues Transmittal Letter Issue Description None N/A

• This record was final approved on 5/4/2018 3:31:04 PM. (This statement was added by the PRIME system upon Its validation)

Westinghouse Non-Proprietary Class 3 Attachment to LTR-SATH-18-006 Rev. 0 Page 1 of 7 May 4, 2018

Attachment:

LBLOCA and SBLOCA Backup Sheets This record was Anal approved on 5/4/2018 3;31:04 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 Attachment to LTR-SATH-18-006 Rev. 0 Page 2 of 7 May 4, 2018 Westinghouse LOCA Peak Clad Temperature Summary for Appendix K Large Break Plant Name: Palo Verde Nuclear Generating Station Unit 1 Utility Name: Arizona Public Service Revision Date: 4/2/2018 Analysis Information EM: 1999 EM Analysis Date: 8/31/2009 Limiting Break Size: 0.6 DEG/PD Fuel: 16x16 System 80 SGTP (%): 10 PLHGR 13.1 Notes: 1. Plant Configuration: Rated Core Power = 3990 MWt, Replacement Steam Generators.

2. Fuel Design: 16x16 System 80 with ZIRLO^'^ cladding, value-added pellets, and erbia burnable absorbers.

Clad Temp (°F) Ref. Notes LICENSING BASIS Analysis-Of-Record PCT 2106 1 PCT ASSESSMENTS (Delta PCT)

A. PRIOR ECCS MODEL ASSESSMENTS

1. None 0 B. PLANNED PLANT MODIFICATION EVALUATIONS

1. None 0 C. 2017 ECCS MODEL ASSESSMENTS

1. None 0 D. OTHER*

1 None 0 LICENSING BASIS PCT + PCT ASSESSMENTS PCT = 2106

• It is recommended that the licensee determine if these PCT allocations should be considered with respect to 10 CFR 50.46 reporting requirements.

References:

1. CVER-09-62, "Analyis of Record for Large Break LOCA ECCS Performance Analysis Including Replacement Steam Generators and Simplified Head Implementation for PVNGS Units 1, 2, and 3." August 2009.

Notes:

None This record was final approved on 5/4/2018 3:31:04 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 Attachment to LTR-SATH-18-006 Rev. 0 Page 3 of 7 May 4, 2018 Westinghouse LOCA Peak Clad Temperature Summary for Appendix K Small Break Plant Name: Palo Verde Nuclear Generating Station Unit 1 Utility Name: Arizona Public Service Revision Date: 4/2/2018 Analysis Information EM: S2M Analysis Date: 3/22/2002 Limiting Break Size: 0.05 sq ft/PD Fuel: 16x16 System 80 SGTP (%): 10 PLUGR 13.5 Notes: 1. Plant Configuration: Rated Core Power = 3990 MWt, Replacement Steam Generators.

2. Fuel Design: 16x16 System 80 with ZIRLO' cladding, value-added pellets, and erbia burnable absorbers.

Clad Temp (°F) Ref. Notes LICENSING BASIS Analysis-Of-Record PCT 1618 1 PCT ASSESSMENTS (Delta PCT)

A. PRIOR ECCS MODEL ASSESSMENTS I. None 0 B. PLANNED PLANT MODIFICATION EVALUATIONS

1. None 0 C. 2017 ECCS MODEL ASSESSMENTS

1. None 0 D. OTHER*

1. None 0 LICENSING BASIS PCT + PCT ASSESSMENTS PCT = 1618

• It is recommended that the licensee determine if these PCT allocations should be considered with respect to 10 CFR 50 46 reporting requirements.

References:

1 A-PV-FE-0149, Rev. 001, Palo Verde Units 1,2 and 3 S2M Bounding SBLOCA ECCS Performance Analysis, March 2002.

Notes:

None This record vras final approved on 5/4/2018 3:31:04 PM. (This statement was added by the PRIME system upon Its validation)

Westinghouse Non-Proprietary Class 3 Attachment to LTR-SATH-18-006 Rev, 0 Page 4 of 7 May 4, 2018 Westinghouse LOCA Peak Clad Temperature Summary for Appendix K Large Break Plant Name: Palo Verde Nuclear Generating Station Unit 2 Utility Name: Arizona Public Service Revision Date: 4/2/2018 Analysis Information EM: 1999 EM Analysis Date: 8/31/2009 Limiting Break Size: 0.6 DEG/PD Fuel: 16x16 System 80 SGTP (%): 10 PLHGR 13.1 Notes: 1. Plant Configuration; Rated Core Power = 3990 MWt, Replacement Steam Generators.

2. Fuel Design; 16x16 System 80 withZIRLO' cladding, value-added pellets, and erbia burnable absorbers.

Clad Temp (°F) Ref. Notes LICENSING BASIS Analysis-Of-Record PCT 2106 1 PCX ASSESSMENTS (Delta PCT)

A. PRIOR ECCS MODEL ASSESSMENTS

1. None B. PLANNED PLANT MODIFICATION EVALUATIONS

1. None C. 2017 ECCS MODEL ASSESSMENTS

1. None 0 D. OTHER*

1. None 0 LICENSING BASIS PCT + PCT ASSESSMENTS PCT = 2106

• It is recommended that the licensee determine if these PCT allocations should be considered with respect to 10 CFR 50.46 reporting requirements.

References:

1. CVER-09-62, "Analysis of Record for Large Break LOCA ECCS Performance Analysis Including Replacement Steam Generators and Simplified Head Implementation for PVNGS Units 1,2, and 3," August 2009.

Notes:

None

• This record was final approved on 5/4/2018 3;31;04 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 Attachment to LTR-SATH-18-006 Rev. 0 Page 5 of 7 May 4, 2018 Westinghouse LOCA Peak Clad Temperature Summary for Appendix K Small Break Plant Name: Palo Verde Nuclear Generating Station Unit 2 Utility Name: Arizona Public Service Revision Date: 4/2/2018 Analysis Information EM: S2M Analysis Date: 3/22/2002 Limiting Break Size: 0.05 sq fl/PD Fuel: 16x16 System 80 SGTP (%): 10 PLHGR 13.5 Notes: 1. Plant Configuration: Rated Core Power = 3990 MWt, Replacement Steam Generators.

2. Fuel Design: 16x16 System 80 with ZIRLO' cladding, value-added pellets, and erbia burnable absorbers.

Clad Temp (°F) Ref. Notes LICENSING BASIS Analysis-Of-Record PCT 1618 1 PCT ASSESSMENTS (Delta PCT)

A. PRIOR ECCS MODEL ASSESSMENTS 1 None 0 B. PLANNED PLANT MODIFICATION EVALUATIONS

1. None 0 C. 2017 ECCS MODEL ASSESSMENTS

1. None 0 D. OTHER*

1. None 0 LICENSING BASIS PCT + PCT ASSESSMENTS PCT = 1618

• It is recommended that the licensee determine if these PCT allocations should be considered with respect to 10 CFR 50.46 reporting requirements.

References:

1. A-PV-FE-0149, Rev. 001, Palo Verde Units 1,2 and 3 S2M Bounding SBLOCA ECCS Performance Analysis, March 2002.

Notes:

None This record was final approved on 5/4/2018 3:31:04 PM. (This statement was added by the PRIME system upon Its validation)

Westinghouse Non-Proprietary Class 3 Attachment to LTR-SATH-18-006 Rev. 0 Page 6 of 7 May 4, 2018 Westinghouse LOCA Peak Clad Temperature Summary for Appendix K Large Break Plant Name: Palo Verde Nuclear Generating Station Unit 3 Utility Name: Arizona Public Service Revision Date: 4/2/2018 Analysis Information EM: 1999 EM Analysis Date: 8/31/2009 Limiting Break Size: 0.6 DEG/PD Fuel: 16x16 System 80 SGTP (%): 10 PLHGR 13.1 Notes: 1. Plant Configuration: Rated Core Power = 3990 MWt, Replacement Steam Generators.

2. Fuel Design: 16x16 System 80 with ZIRLO' cladding, value-added pellets, and erbia burnable absorbers.

Clad Temp (°F) Ref. Notes LICENSING BASIS Analysis-Of-Record PCT 21061 PCT ASSESSMENTS (Delta PCT)

A. PRIOR ECCS MODEL ASSESSMENTS

1. None 0 B. PLANNED PLANT MODIFICATION EVALUATIONS

1. None 0 C. 2017 ECCS MODEL ASSESSMENTS

1. None 0 D. OTHER*

1 None LICENSING BASIS PCT + PCT ASSESSMENTS PCT = 2106 It is recommended that the licensee determine if these PCT allocations should be considered with respect to 10 CFR 50 46 reporting requirements

References:

1. CVER-09-62, "Analysis of Record for Large Break LOCA ECCS Performance Analysis Including Replacement Steam Generators and Simplified Head Implementation for PVNGS Units 1,2, and 3," August 2009.

Notes:

None This record wras final approved on 5/4/2018 3:31:04 PM. (This statement was added by the PRIME system upon its validation)

Westinghouse Non-Proprietary Class 3 Attachment to LTR-SATH-18-006 Rev. 0 Page 7 of 7 May 4. 2018 Westinghouse LOCA Peak Clad Temperature Summary for Appendix K Small Break Plant Name: Palo Verde Nuclear Generating Station Unit 3 Utility Name: Arizona Public Service Revision Date: 4/2/2018 Analysis Information EM: S2M Analysis Date: 3/22/2002 Limiting Break Size: 0.05 sq ft/PD Fuel: 16x16 System 80 SGTP(%): 10 PLHGR 13.5 Notes: 1. Plant Configuration: Rated Core Power = 3990 MWt, Replacement Steam Generators.

2. Fuel Design: 16x16 System 80 with ZIRLC^*^ cladding, value-added pellets, and erbia burnable absorbers.

Clad Temp (°F) Ref. Notes LICENSING BASIS Analysis-Of-Record PCT 1618 PCT ASSESSMENTS (Delta PCT)

A. PRIOR ECCS MODEL ASSESSMENTS

1. None B. PLANNED PLANT MODIFICATION EVALUATIONS

1. None C. 2017 ECCS MODEL ASSESSMENTS 1, None D. OTHER*

1. None LICENSING BASIS PCT + PCT ASSESSMENTS PCT = 1618

• It is recommended that the licensee determine if these PCT allocations should be considered with respect to 10 CFR 50.46 reporting requirements.

References:

1. A-PV-FE-0149, Rev. 001, "Palo Verde Units 1, 2, and 3 S2M Bounding SBLOCA ECCS Performance Analysis," March 2002.

Notes:

None

' This record was final approved on 5/4/2018 3:31:04 PM. (This statement was added by the PRIME system upon Its validation)