Abstract
Increased attention is being given to the analysis of anticipated plant transients and abnormal plant operating conditions. This is in contrast to past regulatory activities devoted primarily to the analysis of design basis accidents (DBA), such as the large-break loss-of-coolant accident (LOCA), which were designed to represent worst or bounding cases. This change has come about due to the realization that anticipated transients with multiple failures (including operator actions) are the major contributors to risk from reactor operations and that the low probability DBAs are relatively small contributors to risk. The accident at Three Mile Island Unit 2 (TMI-2) has shown that anticipated transients, combined with multiple equipment and/or operator failures, can result in significant core damage.
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