ML24086A514

Changes to the Westinghouse and Framatome ECCS Evaluation Models and PCT Penalty Assessments

ML24086A514
Person / Time
Site:	Callaway
Issue date:	03/26/2024
From:	Ameren Missouri, Union Electric Co
To:	Office of Nuclear Reactor Regulation
Shared Package
ML24086A512	List: ML24086A513 ML24086A514 ULNRC-06861, Westinghouse and Framatome, ECCS Evaluation Model Margin Assessments
References
ULNRC-06861
Download: ML24086A514 (1)

Text

Attachment 1 to ULNRC-06861 Page 1of 2

ATTACHMENT 1

CHANGES TO THE WESTINGHOUSE AND FRAMATOME

ECCS EVALUATION MODELS AND PCT PENALTY ASSESSMENTS

to ULNRC-06861 Page 2of 2

1. WESTINGHOUSE

There have been no changes to the Westinghouse ECCS Large Break and Small Break Evaluation Models during the time period from March 2023 to March 2024.

2. FRAMATOME

Background

An error was identified in the default value used for fuel open porosity in the COPERNIC fuel model that is used in the Realistic Large Break LOCA (RLBLOCA) uncertainty analysis performed under Framatome EMF-210P-A Revision 3 methodology. When the fuel performance code COPERNIC was incorporated into the RLBLOCA methodology, the default value specified for the UO2 fuel open porosity was incorrectly selected from a different fuel type. The error in the fuel open porosity impacts the LOCA fuel initial conditio ns determined by COPERNIC and used in the RLBLOCA uncertainty analysis. An evaluation was conducted to determine the impact the error has on the affected RLBLOCA uncertainty analysis.

Estimated Effect

The evaluation determined that fuel model open porosity input error has no impact on Callaway's RLBLOCA peak clad temperature. Also, the Small Break LOCA methodology analysis, which uses EMF -2328, is not impacted as the error is unique to EMF-2103P-A Revision 3 applications.