NRC CAL – NOV (White)

On September 16, 2015 the NRC issued a Notice of Violation associated with a White Significance Determination Process finding to Exelon Generation Company, LLC for a violation of 10 CFR Part 50, Appendix B, Criterion III, "Design Control". This violation involved the failure to review the suitability of application of the Automatic Depressurization System electromatic relief valve (ERV) actuators, which are essential to perform the safety-related reactor vessel depressurization and overpressure protection functions. This resulted in a failure of the 2C ERV, and an indeterminate period of inoperability and unavailability greater than allowed by Technical Specifications (TS) during the operating cycle. The 2C ERV inoperability during the operating cycle was identified after the failure of the valve during its first operational test in a mid-cycle outage. Additionally, because the licensee was not aware of the valve's inoperability between 2013 and 2015, the required TS actions were not followed.