At 0114 EDT on 10/7/07, Fermi 2 feed water line
check valves, B2100-F010B and B2100-F076B, failed their local leak rate tests. The leakage rate of the inboard
check valve (B2100-F010B) was 297.3 SCFH and the leakage rate of the outboard
check valve (B2100-F076B) was indeterminate due to leakage exceeding the capability of the leak rate monitor. Thus, the minimum path leakage through penetration X-9B is 297.3 SCFH. This leak rate exceeds the
Primary Containment allowable leakage rate (1.0 La) of 296.3 SCFH per Tech. Spec. 5.5.12. The NRC Resident Inspector has been notified of this event.
The licensee is reporting a degraded safety function associated with the
primary containment barrier. The licensee intends to repair the leaking valve and retest it prior to any mode change. There is no LCO associated with this condition because the licensee is in mode 5.
