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On November 1, 2013 at 0309 EDT, Secondary … On November 1, 2013 at 0309 EDT, Secondary Containment Zone I (Unit 1 Reactor Building) differential pressure was lost following a routine transfer of Reactor Protection System Power supplies. Upon restoration from the power supply transfer, one of the Reactor Building Exhaust Fans tripped. There were no obvious malfunctions associated with the equipment and fan was able to be restarted. Zone II (Unit 2 Reactor Building) and III (Common Refuel Floor Area) ventilation remained in service and stable.</br>Zone I differential pressure recovered within a few minutes and was verified to be stable. LCO 3.6.4.1 was entered for both units at 0309 EDT and exited at 0315 EDT. Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 inches water gauge. </br>There have been no further perturbations in differential pressure and secondary containment remains operable.</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 licensee notified the NRC Resident Inspector. See similar event number #49489.spector. See similar event number #49489. +
07:09:00, 1 November 2013 +
09:51:00, 1 November 2013 +
07:09:00, 1 November 2013 +
On November 1, 2013 at 0309 EDT, Secondary … On November 1, 2013 at 0309 EDT, Secondary Containment Zone I (Unit 1 Reactor Building) differential pressure was lost following a routine transfer of Reactor Protection System Power supplies. Upon restoration from the power supply transfer, one of the Reactor Building Exhaust Fans tripped. There were no obvious malfunctions associated with the equipment and fan was able to be restarted. Zone II (Unit 2 Reactor Building) and III (Common Refuel Floor Area) ventilation remained in service and stable.</br>Zone I differential pressure recovered within a few minutes and was verified to be stable. LCO 3.6.4.1 was entered for both units at 0309 EDT and exited at 0315 EDT. Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 inches water gauge. </br>There have been no further perturbations in differential pressure and secondary containment remains operable.</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 licensee notified the NRC Resident Inspector. See similar event number #49489.spector. See similar event number #49489. +
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Unit 1 +, 05000387/LER-2013-006-01, 1 for Susquehanna Steam Electric Station, Unit 1, Regarding Loss of Secondary Containment Due to Differential Pressure Not Meeting Technical Specification 3.6.4.1 +, 1 for Susquehanna Steam Electric Station + and Regarding Loss of Secondary Containment Due to Differential Pressure Not Meeting Technical Specification 3.6.4.1 +
00:00:00, 1 November 2013 +
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01:52:47, 2 March 2018 +
09:51:00, 1 November 2013 +
true +
false +
0.113 d (2.7 hours, 0.0161 weeks, 0.0037 months) +
07:09:00, 1 November 2013 +
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