Technical Specification 3.6.1, Containment, requires that containment operability be maintained in Mode 1, restored within one hour, or the reactor be shutdown to Mode 3 within six hours. Contrary to this requirement,
FENOC failed to maintain containment operability or restore containment operability in the allowed time. Specifically,
FENOC did not ensure containment isolation valves MOV-1RS-155B and MOV-1RS-156B were closed and de-energized prior to opening the
1RS-P-2B pump casing drain valve. The issue was entered into
FENOCs corrective action program as CR 09-56250. The finding was more than minor because it is associated with the configuration control attribute of the
barrier integrity cornerstone and affects the cornerstone objective of ensuring containment boundary preservation under postulated design-basis accident scenarios. The inspectors determined that the finding was of very low safety significance (Green), based on
IMC 0609, Appendix H, Table 4.1 because this is a Type B finding and the affected pipe size is less than 2 inches in diameter