NRC CAL – NOV (White)

On April 13, 2017, the NRC issued a Notice of Violation to Exelon Nuclear (Exelon) for a violation of Technical Specification 6.8.1, “Procedures and Programs,” at Oyster Creek associated with a White Significance Determination Process finding. Specifically, Exelon failed to properly implement a procedure for rebuilding and reassembly of an electromagnetic relief valve. The maintenance instruction directed reinstallation of a lever plate with previously removed lock washers. By failing to reinstall the lock washers, the licensee caused excessive friction between the solenoid frame and the cut-out switch lever plate, causing the cut-out switch lever to become bound in the energized position and rendering the valve unable to perform its safety-related function. Additionally, this incorrect reassembly resulted in the relief valve being inoperable for greater than the Technical Specification allowed outage time for the Automatic Depressurization System.