Advanced Test Reactor Emergency Firewater Injection Valves Failure
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Type:  Lessons Learned

Publisher:  Idaho National Laboratory, Idaho Falls, ID

Published As:  Public

Date: 

Topics:  Nuclear/Nuclear Safety, Engineering, Operations, Maintenance

During time response testing, the bottom head Emergency Firewater Injection System level control valves failed Catastrophically at their yokes. Any air controlled system where the maximum inlet pressure to the regulator exceeds the maximum pressure rating of downstream equipment should have overpressure protection. Pressure regulators should not be set under flow conditions. When abnormal or unplanned conditions occur during component testing, proper work control processes (troubleshooting, document change, work order change) must be used when responding outside the bounds of the procedure being used.

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