An NRC-identified
NCV of
10 CFR Part 50 Appendix B, Criterion XVI, Corrective Action, was identified when the licensee failed to promptly identify a
condition adverse to quality associated with the inadequate sealing for safety related cabinet 1FWPNRWLP (Unit 1 Refueling Water Storage Tank (
RWST) Channel 4 Level Instrumentation loop). Specifically, the licensee did not identify that the seal around a cable bundle entering the top of 1FWPNRWLP had degraded to the point where it would no longer protect against water intrusion into the cabinet. The licensee placed this issue into their
CAP as
PIP M-14-05643 and took corrective action by replacing the seal. The inspectors determined that the failure to promptly identify a
condition adverse to quality associated with the inadequate sealing of 1FWPNRWLP was a performance deficiency. This performance deficiency was more than minor because it was associated with the equipment performance attribute of the Mitigating System Cornerstone and adversely affected the cornerstone objective of ensuring the capability of the automatic
RWST swap over function to respond to
initiating events to prevent undesirable consequences. Using
IMC 0609,
Significance Determination Process, Appendix A, Exhibit 2 -
Mitigating Systems Screening Questions, dated June 19, 2012, the inspectors determined this finding was of very low safety significance (Green) because the finding was not a deficiency affecting the design or qualification and did not represent an actual loss of system and/or function. The finding had a cross-cutting aspect of Procedure Adherence, as described in the Human Performance cross-cutting area because the licensee failed to adequately implement the walkdown process outlined in EDM-203 and promptly identify this degradation.
