Operating Experience Feedback Report-Solenoid-Operated Valve Problems: CommercialPower Reactors

摘要

The report highlights significant operating events involving observed orpotential common-mode failures of solenoid-operated valves (SOVs) in U.S. plants. These events resulted in degradation or malfunction of multiple trains of safety systems as well as of multiple safety systems. On the basis of the evaluation of these events, the Office for Analysis and Evaluation of Operational Data (AEOD) of the U.S. Nuclear Regulatory Commission (NRC) concludes that the problems with solenoid-operated valves are an important issue that needs additional NRC and industry attention. The report also provides AEOD's recommendations for actions to reduce the occurrence of SOV common-mode failures.