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On November 27, 2013 at 1001 (EST), Susque … On November 27, 2013 at 1001 (EST), Susquehanna Steam Electric Station operators observed secondary containment differential pressure was at 0.04 inches water gauge for Zone I (Unit 1 Reactor Building). Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 inches water gauge. Zone II (Unit 2 Reactor Building) and III (Common Refuel Floor Area) ventilation remained in service and stable.</br>Zone I differential pressure was impacted due to equipment malfunction. The inservice reactor building exhaust fan discharge damper developed an air leak at the solenoid operator. Zone 1 Building D/P was restored to within the required band at 1111 (EST) by placing the standby train exhaust fan, which was out of service for maintenance, in operation and verified to be stable. LCO 3.6.4.1 was entered for both units at 1001 (EST) and exited at 1131 (EST).</br>This event is being reported under 10 CFR 50.72(b)(3)(v) and per the guidance of NUREG 1022 Rev 3 section 3.2.7 as a loss of a Safety Function. There is no redundant Susquehanna Secondary Containment System.</br>The NRC Resident Inspector has been informed. NRC Resident Inspector has been informed. +
15:01:00, 27 November 2013 +
49,588 +
14:58:00, 27 November 2013 +
15:01:00, 27 November 2013 +
On November 27, 2013 at 1001 (EST), Susque … On November 27, 2013 at 1001 (EST), Susquehanna Steam Electric Station operators observed secondary containment differential pressure was at 0.04 inches water gauge for Zone I (Unit 1 Reactor Building). Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 inches water gauge. Zone II (Unit 2 Reactor Building) and III (Common Refuel Floor Area) ventilation remained in service and stable.</br>Zone I differential pressure was impacted due to equipment malfunction. The inservice reactor building exhaust fan discharge damper developed an air leak at the solenoid operator. Zone 1 Building D/P was restored to within the required band at 1111 (EST) by placing the standby train exhaust fan, which was out of service for maintenance, in operation and verified to be stable. LCO 3.6.4.1 was entered for both units at 1001 (EST) and exited at 1131 (EST).</br>This event is being reported under 10 CFR 50.72(b)(3)(v) and per the guidance of NUREG 1022 Rev 3 section 3.2.7 as a loss of a Safety Function. There is no redundant Susquehanna Secondary Containment System.</br>The NRC Resident Inspector has been informed. NRC Resident Inspector has been informed. +
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00:00:00, 27 November 2013 +
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