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On October 31, 2013 at 0251, Secondary Con … On October 31, 2013 at 0251, 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 Equipment Compartment 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 0251 and exited at 0255. 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 has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
06:51:00, 31 October 2013 +
49,489 +
05:00:00, 31 October 2013 +
06:51:00, 31 October 2013 +
On October 31, 2013 at 0251, Secondary Con … On October 31, 2013 at 0251, 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 Equipment Compartment 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 0251 and exited at 0255. 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 has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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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, 31 October 2013 +
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01:52:48, 2 March 2018 +
05:00:00, 31 October 2013 +
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-0.0771 d (-1.85 hours, -0.011 weeks, -0.00253 months) +
06:51:00, 31 October 2013 +
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