NRC CAL – NOV (Yellow)

On April 27, 2015, the NRC issued a Notice of Violation associated with a White Significance Determination Process finding to Exelon Generating Company LLC (the licensee) for a violation of 10 CFR 50, Appendix B, Criterion III, "Design Control," involving the failure to review the suitability of application of a different maintenance process, at its Oyster Creek Nuclear Generating Station that was essential to a safety-related function of the Emergency Diesel Generators (EDGs). Specifically, from May 13, 2005, to September 9, 2014, the licensee failed to verify the adequacy of the acceptance criteria for a new EDG belt maintenance process, which resulted in the EDG's cooling fan shaft being susceptible to fatigue failure, which occurred on July 28, 2014. Additionally, because the licensee was not aware of the EDG's inoperability between 2005 and 2014, the required actions of the Technical Specifications were not followed.