The NRC identified a Green non-cited violation of
10 CFR 50, Appendix B, Criterion XVI, Corrective Action, for the licensees failure to identify and correct deficiencies in watertight doors that protect the safety-related
Residual Heat Removal Service Water pumps and
Emergency Equipment Cooling Water pumps from external flooding. The licensee issued work orders to correct the conditions and entered the issue into their corrective action program as Problem Evaluation Reports 133891 and 134346. This finding was more than minor because it affects the External Factors (Flood Hazard) attribute of the
Mitigating Systems Cornerstone. It impacted the cornerstone objective of ensuring the availability, reliability, and operability of safety-related pumps to perform their intended safety function during a design basis flooding event. A
Significance Determination Process Phase 3 analysis determined that the finding was of very low safety significance because of the low likelihood of the design basis flood. The finding was directly related to the cross-cutting aspect of procedural compliance of the work control component of the cross-cutting area of Human Performance. Mechanics were not complying with quarterly work orders and maintenance procedure to assure functionally of the watertight doors (
H.4(b))
