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On April 17, 2014 at 0335 EDT, Secondary C … On April 17, 2014 at 0335 EDT, Secondary Containment Zone 3 (Unit 1&2 Reactor Building) differential pressure went to 0.15 inches WG (negative) following securing Unit 1 Zone 3 HVAC in preparation for a LOCA/LOOP test. Zone 3 HVAC was restored at 0420 EDT. Zone I (Unit 1 Reactor Building) ventilation is isolated with secondary containment relaxed for refuel outage on Unit 1. Zone II (Unit 2 Reactor Building) ventilation remained in service and stable.</br>Zone 3 differential pressure recovered to SR 3.6.4.1.1 requirements of 0.25 inches WG (negative) at 0420 EDT and was verified to be stable. LCO 3.6.4.1 was entered at 0335 EDT and exited at 0420 EDT. Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 inches water gauge (WG) for all three Reactor Building Ventilation Zones. </br>This event is being reported under 10 CFR 50.72(b)(3)(v)(C) 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 informed the NRC Resident Inspector. licensee informed the NRC Resident Inspector. +
07:35:00, 17 April 2014 +
50,040 +
06:00:00, 17 April 2014 +
07:35:00, 17 April 2014 +
On April 17, 2014 at 0335 EDT, Secondary C … On April 17, 2014 at 0335 EDT, Secondary Containment Zone 3 (Unit 1&2 Reactor Building) differential pressure went to 0.15 inches WG (negative) following securing Unit 1 Zone 3 HVAC in preparation for a LOCA/LOOP test. Zone 3 HVAC was restored at 0420 EDT. Zone I (Unit 1 Reactor Building) ventilation is isolated with secondary containment relaxed for refuel outage on Unit 1. Zone II (Unit 2 Reactor Building) ventilation remained in service and stable.</br>Zone 3 differential pressure recovered to SR 3.6.4.1.1 requirements of 0.25 inches WG (negative) at 0420 EDT and was verified to be stable. LCO 3.6.4.1 was entered at 0335 EDT and exited at 0420 EDT. Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 inches water gauge (WG) for all three Reactor Building Ventilation Zones. </br>This event is being reported under 10 CFR 50.72(b)(3)(v)(C) 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 informed the NRC Resident Inspector. licensee informed the NRC Resident Inspector. +
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