PROCEDURE DESIGN OF FB OPERATION AND ITS IMPACT ON THE RISK OF A NUCLEAR POWER PLANT

摘要

A feed and bleed (F&B) operation is an operator's emergency task to remove core heat from a reactor coolant system by bleeding coolant from the pressurizer. and feeding makeup water through safety injection systems under the loss of all feedwater condition. Even though the F&B operation is an important task having a significant impact on the risk of a nuclear power plant, there is a high uncertainty regarding its modeling and analysis in a PSA. This paper introduces a study on the design of an operational strategy for an F&B operation and its impact on the risk of a nuclear power plant in Korea. An intensive support analysis was conducted to understand the plant behavior and revise the success criteria for the HRA of the F&B operation. A human performance analysis on the emergency tasks was also conducted using a training simulator to generate the operator's performance time for the F&B operation. We revised the PSA model and updated the risk of the reference plant, which shows that the risk of the revised model is much higher than that of the existing model.