A self-revealing finding of very low safety significance that constituted a non-cited violation (
NCV) of
Technical Specification 6.4.D was identified. Licensee personnel failed to follow procedure 2-IPM-CC-F-207A and caused cooling water flow to the thermal barrier of the Unit 2
Reactor Coolant Pump (
RCP) 1A to be isolated for approximately 15 minutes. The finding was entered into the corrective action program as Condition Report 093555. Licensee corrective actions included re-opening the valve, restoring cooling flow to the thermal barrier, and providing training station wide on procedure adherence. The failure to follow procedure 2-IPM-CC-F-207A was a performance deficiency. The finding is more than minor because it is associated with the human performance attribute of the Initiating Event Cornerstone, and adversely affected the cornerstones objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions. The finding, evaluated per the
SDP in
IMC 0609, Appendix A, is of very low safety significance (Green) because the finding would not have resulted in exceeding the Technical Specification limit for
RCS leakage, due to operation of the
RCP seal injection system. This finding has a cross-cutting aspect in the area of human performance work practices (
H.4.b) because personnel failed to follow a written and approved procedure. (Section 1R22
