ML26028A129
| ML26028A129 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 01/28/2026 |
| From: | Nelson S Nebraska Public Power District (NPPD) |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| N1S2026003 | |
| Download: ML26028A129 (0) | |
Text
N Nebraska Public Power District Alway th.ere whenyou need. us N1S2026003 January 28,2026 50.46(a)(3)(ii)
U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555-0001
Subject:
Annual Report of Changes and Errors in Emergency Core Cooling System Evaluation Models for 2Q25 Cooper Nuclear Station, Docket No. 50-298, Renewed License DPR-46
Reference:
Letter from Linda Dewhirst, Nebraska Public Power District, to U.S. Nuclear Regulatory Commission, dated January 29,2025, "Annual Report of Changes and Errors in Emergency core cooling System Evaluation Models lor 2024" The purpose of this letter is to submit the 2025 annual report of changes and errors in the Emergency Core Cooling System (ECCS) evaluation models pursuant to 10 CFR 50.46(a)(3)(ii) for Cooper Nuclear Station (CNS).
Per the reference letter, Nebraska Public Power District previously reported errors/changes in the ECCS evaluation models for GNF2 fuel. These errors continued to apply to the ECCS evaluation methodologies for 2025. There were no new changes or errors affecting the licensing basis peak clad temperature (PCT) in 2025. CNS continues to comply with the PCT limit of 2200"F specified in 10 CFR 50.46(bX1). to this letter itemizes the changes/errors in the ECCS evaluation models that remained applicable in 2025 and Attachment 2 provides data that demonstrates compliance with the ECCS performance requirements of 10 CFR 50.46.
This letter makes no regulatory commitments.
lf you have any questions regarding this report, please contact Ryan VanderPlas, Fuels Engineer, at (402) 825-5409.
Sincerelv.%
Steve Nelson Regulatory Affairs & Compliance Manager ljo COOPER NUCTEAR STATION P.O. Box 98 / Brownville, NE 68321-0098 Telephone: (402) 82s-3811 / Fax: (402)825-5211 wwwnppd.com
N1S2026003 Page2 of 2 Attachments: 1) Changes/Enors in Emergency Core Cooling System Evaluation Models Applicable in 2025
- 2) 10 CFR 50.46 Criteria in Emergency Core Cooling System Evaluation Models for 2025 cc:
Regional Administrator dattachments, USNRC - Region lV Cooper Project Manager dattachments, USNRC - NRR Plant Licensing Branch lV Senior Resident Inspector w/attachments, USNRC - CNS NPG Distribution w/attachments CNS Records Mattachmerits
N152026003 Page 1 of 1 Changes/Errors in Emergency Core Gooling System Evaluation Models Applicable in 2025 GNF2 Fuel GE Hitachi 10 cFR 50.46 Notification Letter Date Subject PCT lmpact 2017-01 6112t17 GNF2 Lower Tie Plate Leakaqe
-20"F 2017-O2 8t2t17 Fuel Rod Plenum Temperature Update 0'F 2019-05 11t1t19 SAFER Lower Limit on Differential Pressure for Bypass Leakage 0'F 2020-01 4t14t20 PRIME Code Errors for Evaluation Model Fuel Rod Condition lnputs 0"F 2021-01 2t18t21 Fuel Pellet to Plenum Spring Conductance lnput to ECCS LOCA Calculations 0'F 2021-02 2118t21 lnner Cladding Surface Roughness lnput to Gap Conductance Model 0'F Total = -20'F
N152026003 Page 1 of 1 10 CFR 50.46 Criteria in Emergency Gore Gooling System Evaluation Models tor 2O25
/1j Fuel Type Licensing Basis PCT Local Oxidation Core-Wide Metal-Water Reaction GNF2 2130"F
<6.00%
<0.10%