A non-cited violation of
10 CFR 50, Appendix B, Criterion XVI, Corrective Action, was identified for failure to correct the cause of an improper
operability determination on the 3B Reactor Building Cooling Unit. This had originally been identified by the NRC in non-cited violation 50-287/00-02-02. The licensee evaluated this earlier non-cited violation within their corrective action program, but incorrectly concluded the
operability determination had been appropriate and took no related corrective actions. The inspectors discussed this discrepancy with the licensee, who subsequently performed a re-evaluation and implemented appropriate corrective actions
Having a credible impact on safety, this violation was considered more than minor because it involved a previously identified violation of NRC requirements and because prompt determination of operability is important to preserving the validity of the plant safety analysis. However, because it did not directly affect plant equipment or a cornerstone, this issue was determined to have very low safety significance and was not processed through the
Significance Determination Process.
