Green: The inspectors identified a non-cited violation of Title
10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to verify or check the adequacy of the design of bulkheads in the recirculation spray
service water motor operated valve pits. Specifically, the design allowed for unsealed
penetrations in bulkheads and the licensee failed to demonstrate that the unsealed
penetrations would not adversely affect the ability of the bulkheads to provide adequate train separation during a postulated pipe rupture. The licensee entered the issue into the
CAP as Condition Report (CR) 1060189 and sealed the
penetrations. This performance deficiency was determined to be more than minor because it was associated with the design control attribute of the
Mitigating Systems Cornerstone and it adversely affected the cornerstone objective to ensure the capability of systems that respond to
initiating events to prevent undesirable consequences. Specifically, the 3 capability to maintain train separation between the Recirculation Spray
Service Water header motor operated valves was adversely affected due to the presence of degraded
penetrations through the flood barriers. The team determined the finding to be of very low safety significance (Green) because the finding was a deficiency affecting the design of a mitigating structure, system, or component (
SSC), and the
SSC maintained its operability or functionality. This finding was not assigned a cross-cutting aspect because the issue did not reflect current licensee performance.
