A study of heat capacity temperature limit of BWR

Heat capacity temperature limit (HCTL) is an important parameter for operation of BWR. Current version of the HCTL was derived, based on simple model of computation aids (CA) of BWR owners’ group (BWROG). However, some parts of the current HCTL are confusing to the users in reading data. The purpose of this study is to verify the HCTL by applying the MAAP4 code to the field of emergency operating procedure (EOP). The trends of HCTL generated by MAAP4 code are consistent with those obtained from CA. A series of revised HCTL evaluated at various times after scram are provided and the confusing part is eliminated.

► The purpose of this study is to verify the HCTL.
► MAAP4 was used as code to generate a realistic and convenient HCTL.
► The current HCTL curve causes confusing in reading data.
► The revised HCTL curves developed in this study.
► Users can obtain important parameters from the revised HCTL without confusion and interpolation.