Recovery Actions in PRA (Probabilistic Risk Assessment) for the Risk Methods Integration and Evaluation Program (RMIEP). Volume 2. Application of the Data-Based Method.

摘要

In a Probabilistic Risk Assessment (PRA) for a nuclear power plant, the analyst identifies a set of potential core damage events and their estimated probabilities of occurrence. These events include both equipment failures and human errors. If operator recovery from an event within some specified time is considered, the probability of the recovery can be included in the PRA. The report provides PRA analysts with a step-by-step methodology for including recovery actions in a PRA. The recovery action is divided into two distinct phases: a Diagnosis Phase (realizing that there is a problem with a critical parameter and deciding upon the correct course of action) and an Action Phase (physically accomplishing the required action). In the methodology, time-reliability curves, which were developed from simulator data on potentially dominant accident scenarios, are used to provide estimates for the Diagnosis Phase, and other existing methodologies are used to provide estimates for the Action Phase.