A Green NRC identified non-cited violation of
10 CFR 50 Appendix B, Criterion XVI, Corrective Action, was identified when the licensee failed to thoroughly identify and correct water intrusion into the
High Pressure Coolant Injection (
HPCI) lubricating oil system (LOS) on two separate occasions. Residual water from these events was not fully removed which resulted in corrosion of the
HPCI turbine controls. This violation was entered into the licensees corrective action program (
CAP) as CR 2008100154. The inspector determined the performance deficiency was the failure to remove all residual water from the
HPCI LOS following water intrusion on two separate occasions. The finding was more than minor because it was associated with the equipment performance attribute and adversely affected the objective of the
Mitigating Systems cornerstone in that unplanned corrective maintenance of the
HPCI pump rendered the system unavailable to respond to
initiating events. This finding was determined to be of very low safety significance because the failure did not represent a loss of safety function of a single train. The inspector determined this finding was related to the thoroughness of evaluations aspect of the Problem Identification and Resolution cross cutting area. (P.1 (c)) (Section 03
