Exxon Nuclear Company WREM-Based Generic PWR ECCS Evaluation Model Update ENC-WREM-II

The Exxon Nuclear Company's (ENC) WREM-Based PWR ECCS Evaluation Model used in previous LOCA analyses has been updated to consider plants producing low containment back pressure during LOCAs such as would be obtained from ice condenser containment designs. In connection with this expanded capability, the necessary evaluation model (EM) changes, and additional changes of more general applicability, have been made to ENC's-EM. In connection with the WREM-II model development, the ICECON program to compute ice condenser containment response during LOCAs has been developed to provide appropriate containment back pressure for the ENC-WREM-II reflood calculation