The inspectors identified a Green non-cited violation of
10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, because Fitzpatrick staff did not take timely corrective action to verify that a crescent area unit cooler was
operable under postulated conditions of degraded grid voltage. Specifically, Fitzpatrick staff did not schedule first time low voltage pickup testing for unit cooler
66UC-22B until after summer lake temperature had increased to the point that removing the unit cooler from service would have challenged the temperature limit for
ultimate heat sink (
UHS) operability. When the test was later performed, the as-found pickup voltage exceeded the maximum allowed by the procedure and required a case-specific analysis to demonstrate operability. As immediate corrective action, Fitzpatrick electricians cleaned the contact assembly and retested the unit, with satisfactory results. Fitzpatrick staff entered this issue into the corrective action program as condition report (CR)-JAF-2012-04443. The finding was more than minor because it was similar to example 3.i in
Inspection Manual Chapter (IMC) 0612, Appendix E, Examples of Minor Issues, in that a case-specific engineering analysis was required to assure the accident analysis requirements were met. The finding also affected the equipment performance attribute of the
Mitigating Systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to
initiating events to prevent undesirable consequences. The inspectors evaluated the finding in accordance with
IMC 0609, Appendix A, The
Significance Determination Process (
SDP) for Findings At-Power, and determined that the finding was of very low safety significance (Green) because
66UC-22B maintained its functionality. The finding had a cross-cutting aspect in the area of Problem Identification and Resolution, Corrective Action Program, because Fitzpatrick staff did not take appropriate corrective actions to address a safety issue in a timely manner, commensurate with its safety significance
