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On December 06, 2015 at 0350 (EST), Reacto … On December 06, 2015 at 0350 (EST), Reactor Building Zone 1 Secondary Containment differential pressure lowered to less than 0.25 inch Water Column (WC) (degrading vacuum) when the intake supply plenum screens were found to be iced over. This required a TS 3.6.4.1 entry for failure to meet SR 3.6.4.1.1 on Unit 1 and Unit 2.</br> </br>Snow melt heaters were manually started to melt the ice allowing restoration of Reactor Building Zone 1 Secondary Containment differential pressure to greater than 0.25 inch WC at 0434 on December 06, 2015.</br>This event is being reported under 10 CFR 50.72 (b)(3)(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 has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
08:50:00, 6 December 2015 +
51,587 +
05:28:00, 6 December 2015 +
08:50:00, 6 December 2015 +
On December 06, 2015 at 0350 (EST), Reacto … On December 06, 2015 at 0350 (EST), Reactor Building Zone 1 Secondary Containment differential pressure lowered to less than 0.25 inch Water Column (WC) (degrading vacuum) when the intake supply plenum screens were found to be iced over. This required a TS 3.6.4.1 entry for failure to meet SR 3.6.4.1.1 on Unit 1 and Unit 2.</br> </br>Snow melt heaters were manually started to melt the ice allowing restoration of Reactor Building Zone 1 Secondary Containment differential pressure to greater than 0.25 inch WC at 0434 on December 06, 2015.</br>This event is being reported under 10 CFR 50.72 (b)(3)(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 has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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00:00:00, 6 December 2015 +
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>.
01:46:12, 2 March 2018 +
05:28:00, 6 December 2015 +
true +
false +
-0.14 d (-3.37 hours, -0.0201 weeks, -0.00462 months) +
08:50:00, 6 December 2015 +
Loss of Secondary Containment Differential Pressure Due to Icing of Intake Supply Plenum Screens +
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