The team identified a non-cited violation of
10 CFR 50.65(a)(1) for the licensees failure to monitor
service water and decay heat cooling expansion tank level indicator
check valves. In response to this concern, the licensee closed the isolation valves as an interim action, performed an in situ
check valve test with satisfactory results, and entered the deficiency into their corrective action program for resolution. The licensees failure to perform appropriate maintenance on the
check valves was a performance deficiency. This finding is more than minor because it is associated with the equipment performance attribute of the
Mitigating Systems cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability and capability of systems that respond to
initiating events to prevent undesirable consequences. The finding is of very low safety significance (Green) using the
SDP because it did not represent a loss of system or safety function. A cross-cutting aspect was not identified because the finding does not represent current performance.
