The inspectors identified a Green
NCV of
10 CFR 50, Appendix B, Criterion XI, Test Control, for incorrect test acceptance criteria for Emergency
Service Water (
ESW) pump discharge
check valves 1SW-9 and 10 during test procedure OST- 1214/1215,
ESW System Operability Train A/B Quarterly Interval Modes 1-2-3-4-5-6- Defueled. This finding was entered into the licensees corrective action program as condition report NCR 277362. The procedure was immediately placed on hold and planned corrective actions included revision of the
ESW pump test procedures to directly observe absence of reverse rotation of the
ESW pumps to verify adequate performance of the
ESW pump discharge
check valves. This finding is more than minor because if left uncorrected, it would become a more significant safety concern since the test procedure could have allowed an
inoperable check valve to satisfactorily pass surveillance testing. Specifically, test criteria established would not ensure that the safety objective of preventing pump reverse rotation was achieved. The inspectors assessed the finding using the
SDP and determined that the finding was of very low safety significance (Green) because the deficiency did not result in the
ESW pumps being
inoperable. (Section 1R21.2.2
