Causes of Larger Degraded Core Frequencies in Earlier Safety Studies Compared with Sizewell 'B'

摘要

The degraded core frequency given by the Sizewell 'B' safety study due to internal initiators is lower than that given by earlier safety studies. The results of three safety studies are compared with those for Sizewell and the design features of the Sizewell plant, which giving significant benefits in minimising degraded core frequency are explained. The main contributions to degraded core frequency from the various internal initiating events and subsequent safety system failures in the three studies are compared with the corresponding contributions for Sizewell. (Atomindex citation 15:049945)