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On April 24, 2014 at 0230 (EDT), Secondary … On April 24, 2014 at 0230 (EDT), Secondary Containment Zone 3 (Unit 1&2 Reactor Building) differential pressure lowered to 0.10 (negative inches) WG (Water Gauge) when restoring Unit 1 Zone 3 HVAC during a routine swap of RPS power supplies, due to a trip of the Unit 1 Zone 3 Supply fan. Zone 3 differential pressure was restored to > 0.25 (negative inches) WG at 0243 hours. 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 WG (negative inches) at 0243 hours and was verified to be stable. LCO 3.6.4.1 was entered at 0230 hours and exited at 0313 hours. Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 (negative inches) WG for all three Reactor Building Ventilation Zones when secondary containment is required. </br>This event is being reported under 10CFR50.72(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 notified the NRC Resident Inspector.The licensee notified the NRC Resident Inspector. +
06:30:00, 24 April 2014 +
07:50:00, 24 April 2014 +
06:30:00, 24 April 2014 +
On April 24, 2014 at 0230 (EDT), Secondary … On April 24, 2014 at 0230 (EDT), Secondary Containment Zone 3 (Unit 1&2 Reactor Building) differential pressure lowered to 0.10 (negative inches) WG (Water Gauge) when restoring Unit 1 Zone 3 HVAC during a routine swap of RPS power supplies, due to a trip of the Unit 1 Zone 3 Supply fan. Zone 3 differential pressure was restored to > 0.25 (negative inches) WG at 0243 hours. 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 WG (negative inches) at 0243 hours and was verified to be stable. LCO 3.6.4.1 was entered at 0230 hours and exited at 0313 hours. Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 (negative inches) WG for all three Reactor Building Ventilation Zones when secondary containment is required. </br>This event is being reported under 10CFR50.72(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 notified the NRC Resident Inspector.The licensee notified the NRC Resident Inspector. +
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00:00:00, 24 April 2014 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
01:50:59, 2 March 2018 +
07:50:00, 24 April 2014 +
false +
0.0554 d (1.33 hours, 0.00792 weeks, 0.00182 months) +
06:30:00, 24 April 2014 +
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