NLS2021002, Annual Report of Changes and Errors in Emergency Core Cooling System Evaluation Models for 2020

Annual Report of Changes and Errors in Emergency Core Cooling System Evaluation Models for 2020

ML21063A248
Person / Time
Site:	Cooper
Issue date:	01/20/2021
From:	Dewhirst L Nebraska Public Power District (NPPD)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NLS2021002
Download: ML21063A248 (4)

Text

H Nebraska Public Power District Al~ thae wh= ::,ou nlld 1t5 NLS2021002 50.46(a)(3)(ii)

January 20, 2021 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 2020 Cooper Nuclear Station, Docket No. 50-298, DPR-46

Reference:

Letter from Linda Dewhirst, Nebraska Public Power District, to U.S. Nuclear Regulatory Commission, dated January 20, 2020, "Annual Report of Changes and Errors in Emergency Core Cooling System Evaluation Models for 2019"

Dear Sir or Madam:

The purpose of this letter is to submit the 2020 annual report of changes and errors in the Emergency Cc::,re 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 2020. There was one zero-degree error for the GNF2 fuel type reported in 2020 applicable to the licensing basis peak clad temperature (PCT). CNS continues to comply with the PCT limit of 2200°F specified in 10 CFR 50.46(b)(l). to this letter itemizes the changes/errors in the ECCS evaluation models that remained applicable in 2020 and Attachment 2 provides data that demonstrates compliance with the ECCS performance requirements of 10 CFR 50.46.

This letter makes no regulatory commitments.

If you have any questions regarding this report, please contact Lome Covington, Engineer, at r

(402) 825-5052.

• ewhirst Regulatory Affairs & Compliance Manager

/tf Attachments: 1) Changes/Errors in Emergency Core Cooling System Evaluation Models Applicable in 2020 COOPER NUCLEAR STATION PO Box 98 / Brownv,//e, NE 68321-0098 Telephone: (402) 825-3811 I Fax: (402) 825-5211 www nppdcom

NLS2021002 Page2 of2

2) 10 CFR 50.46 Criteria in Emergency Core Cooling System Evaluation Models for 2020 cc: Regional Administrator w/attachments USNRC - Region IV Cooper Project Manager w/attachments USNRC - NRR Plant Licensing Branch IV Senior Resident Inspector w/attachments USNRC-CNS NPG Distribution w/attachments CNS Records w/attachments

NLS2021002 Page 1 of 1 Changes/Errors in Emergency Core Cooling System Evaluation Models Applicable in 2020 GNF2 Fuel GE Hitachi Date Subject PCT Impact 10 CFR 50.46 Notification Letter 2017-01 6/12/17 GNF2 Lower Tie -20°F Plate Leakage 2017-02 8/2/17 Fuel Rod Plenum ooF Temperature Update 2019-05 11/1/19 SAFER Lower Limit ooF on Differential Pressure for Bypass Leakage 2020-01 4/14/20 PRIME Code Errors ooF for Evaluation Model Fuel Rod Condition Inputs Total= -20°F

NLS2021002 Page 1 of 1 10 CFR 50.46 Criteria in Emergency Core Cooling System Evaluation Models for 2020 Fuel Type Licensing Basis PCT Local Oxidation Core-Wide Metal-Water Reaction GNF2 2130°F <6.00% <0.10%