ML24086A510
| ML24086A510 | |
| Person / Time | |
|---|---|
| Site: | 05200006 |
| Issue date: | 03/25/2024 |
| From: | Harper Z Westinghouse |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| DCP_NRC_003348 | |
| Download: ML24086A510 (1) | |
Text
Westinghouse Non-Proprietary Class 3
Westinghouse Electric Company 1000 Westinghouse Drive Cranberry Township, Pennsylvania, 16066 USA
U.S. Nuclear Regulatory Commission Direct tel: 412-374-5093 Document Control Desk Direct fax: 724-940-8505 11555 Rockville Pike e-mail: harperzs@westinghouse.com Rockville, MD 20852
Your Ref: Docket No.52-006 Our Ref: DCP_NRC_003348
March 25, 2024
Subject:
10 CFR 50.46 Annual Report for the AP1000 Plant Design
Pursuant to 10 CFR 50.46, Acceptance criteria for emergency core cooling systems for light-water nuclear power reactors, Westinghouse Electric Company, LLC is submitting this report to document emergency core cooling system (ECCS) evaluation model changes or errors for the 2023 Model Year (i.e., 01/01/2023 - 12/31/2023) that affect the peak cladding temperature (PCT) calculations for the AP1000 plant design.
As described below, the following AP1000 analysis of record (AORs) is reported:
AP1000 Design Certification AOR:
On December 30th, 2011, the U.S. Nuclear Regulatory Commission certified an amendment to the Design Certification Rule for the AP1000 plant. As such, AP1000 Design Control Document (DCD)Revision 19 documents the AOR for the AP1000 Design Certification. The limiting transient for the AP1000 Design Certification is the Best Estimate Large Break Loss-of-Coolant Accident (LBLOCA). Westinghouse last provided an annual reporting letter to the NRC in March 2023 (DCP_NRC_003347) which presented an estimated PCT of 2010°F for the LBLOCA evaluation. There are no new ECCS model changes that impact PCT for the 2023 model year.
The estimated PCT for LBLOCA remains at 2010°F and does not exceed the 10 CFR 50.46 (b)(1) acceptance criterion of 2200°F.
The summary of the PCT margin allocations and their bases for the AP1000 Design Certification AOR are provided in the Attachment 1.
By copy of this letter, COL Holders and COL Applicants are hereby notified of any changes or errors in the AP1000 standard plant design PCT calculations as required by 10 CFR 50.46(a)(3)(iii).
AP1000 is a trademark or registered trademark of Westinghouse Electric Company LLC, its affiliates and/or its subsidiaries in the United States of America and may be registered in other countries throughout the world. All rights reserved.
Unauthorized use is strictly prohibited. Other names may be trademarks of their respective owners
© 2024 Westinghouse Electric Company LLC All Rights Reserved Westinghouse Non-Proprietary Class 3
Questions or requests for additional information related to content and preparation of this information should be directed to Westinghouse. Please send copies of such questions or requests to the respective COL Holders and COL Applicants referencing the amended AP1000 Design Certification Rule for the AP1000 nuclear power plant. A representative for each COL Holder and COL Applicant is included on the cc: list of this letter.
Sincerely,
Zachary S. Harper Manager, Licensing Engineering
/Attachments
- 1. 10 CFR 50.46 Annual Report for the AP1000 Design Certification AOR, 2023 Model Year
Cc:
M.Hayes -U.S. NRC J.Douglass -SNC R.Christian -Westinghouse B.Gleaves -U.S. NRC A.Quarles -SNC D.McDevitt - Westinghouse K.Lowery -SNC A.Zaremba -Duke M.Sheaffer -Westinghouse R.Joyce -SNC A.Brown - NextEra M.Barca -Westinghouse A.Chamberlain - SNC C.Zozula -Westinghouse L.Conner -Westinghouse J.Baker -SNC M.Arnold - Westinghouse
© 2024 Westinghouse Electric Company LLC All Rights Reserved DCP_NRC_003348 Westinghouse Non-Proprietary Class 3Page 3 of 6
Attachment 1
10 CFR 50.46 Annual Report for the AP1000 Design Certification AOR, 2023 Model Year
© 2024 Westinghouse Electric Company LLC All Rights Reserved DCP_NRC_003348 Westinghouse Non-Proprietary Class 3Page 4 of 6
GENERAL CO DE M AINTENANCE
Background
Various changes have been made to enhance the usability of codes and to streamline future analyses. Examples of these changes include improving the input diagnostic checks; enhancing the code output; optimizing active coding; and eliminating inactive coding. These changes represent Discretionary Changes that will be implemented on a forward-fit basis in accordance with Section 4.1.1 of WCAP -13451.
Affected Eva luation Model(s) 2004 Westinghouse Realistic Large Break LOCA Evaluation Model Using ASTRUM
Estimated Effect The nature of these changes leads to an estimated peak cladding temperature impact of 0°F.
© 2024 Westinghouse Electric Company LLC All Rights Reserved DCP_NRC_003348 Westinghouse Non-Proprietary Class 3 Page 5 of 6
LOCA Peak Cladding Temperature (PCT) Summary Plant Name: AP1000 EM: ASTRUM (2004)
Description:
Best Estimate Large Break Summary Sheet Status: DCD
AP1000 AP1K_LOCA -50.46_AP1K_DCD_ASTRUM - 1.1 V.V
PCT (°F) Reference # Note #
ANALYSIS-OF-RECORD 1837 1
Delta PCT Reporting ASSESSMENTS* (°F) Reference # Note # Year**
- 1. Evaluation of Pellet Thermal 2012 Conductivity Degradation and 139 2 Peaking Factor Burndown
- 2. Revised Heat Transfer 2013 Multiplier Distributions 11 3
- 3. Error in Burst Strain Application 23 4 2013
AOR + ASSESSMENTS PCT = 2010.0 °F
- The licensee should determine the reportability of these assessments pursuant to 10 CFR 50.46.
- The Reporting Year refers to the annual reporting year in which this assessment was included.
REFERENCES 1 APP-GW-GL-700, Revision 19, AP1000 Design Control Document, June 2011.
2 LTR-LIS 288, Information Regarding the Evaluation of Fuel Pellet Thermal Conductivity Degradation and Peaking Factor Burndown Including Analysis Input Changes for AP1000 Large Break LOCA Analysis, June 2012.
3 LTR-LIS 357, AP1000 Plant 10 CFR 50.46 Report for Revised Heat Transfer Multiplier Distributions, July 2013.
4 LTR-LIS 41, AP1000 Plant 10 CFR 50.46 Report for the HOTSPOT Burst Strain Error Correction, January 2014.
NOTES:
(a) None
© 2024 Westinghouse Electric Company LLC All Rights Reserved DCP_NRC_003348 Westinghouse Non-Proprietary Class 3 Page 6 of 6
LOCA Peak Cladding Temperature (PCT) Summary Plant Name: AP1000 EM: NOTRUMP-AP AOR
Description:
Appendix K Small Break Summary Sheet Status: DCD
AP1000 AP1K_LOCA -50.46_AP1K_DCD_Appendix_K_SBLOCA - 1.1 V.V
PCT (°F) Reference # Note #
ANALYSIS-OF-RECORD 1370 1 (a)
Delta PCT Reporting ASSESSMENTS* (°F) Reference # Note # Year**
- 1. Adiabatic Heat-up Calculation 264 2 (a) 2010
AOR + ASSESSMENTS PCT = 1634.0 °F
- The licensee should determine the reportability of these assessments pursuant to 10 CFR 50.46.
- The Reporting Year refers to the annual reporting year in which this assessment was included.
REFERENCES 1 APP-GW-GL-700, Revision 19, AP1000 Design Control Document, June 2011.
2 LTR-LIS 373, 10 CFR 50.46 Report for the Evaluation of AP1000 SBLOCA 10- inch Transient Adiabatic Heat-up Calculation, June 2010.
NOTES:
(a) This is an adiabatic heat -up calculated PCT.
© 2024 Westinghouse Electric Company LLC All Rights Reserved