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On April 14, 2017, at approximately 0015 E … On April 14, 2017, at approximately 0015 Eastern Daylight Time (EDT), during a control board walk-down, it was discovered that the drywell and the suppression chamber were simultaneously aligned for venting. This alignment created a flow path from the drywell to the suppression chamber, which would have bypassed the pressure suppression function of the suppression chamber water volume during a Loss of Coolant Accident (LOCA). This condition existed tor approximately 43 minutes, from 2347 EDT on April 13, 2017, when Unit 2 transitioned from Mode 4 to Mode 2, until 0030 on April 14, 2017, when the proper alignment was restored. This condition is reportable in accordance with 10 CFR 50.72(b)(3)(v)(D) as a condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident. Additionally, the change from Mode 4 to Mode 2 with primary containment inoperable constitutes operation prohibited by Technical Specifications (i.e., reportable in accordance with 10 CFR 50.73(a)(2)(i)(B)).</br>The condition did not impact public health and safety. The NRC Resident Inspector has been notified.</br>Unit 2 entered Technical Specification 3.6.1.1, Primary Containment, Condition A, which requires Primary Containment to be restored to operable within 2 hours. Unit 2 exited Condition A within 43 minutes when the proper alignment was restored.es when the proper alignment was restored. +
04:15:00, 14 April 2017 +
52,679 +
07:37:00, 14 April 2017 +
04:15:00, 14 April 2017 +
On April 14, 2017, at approximately 0015 E … On April 14, 2017, at approximately 0015 Eastern Daylight Time (EDT), during a control board walk-down, it was discovered that the drywell and the suppression chamber were simultaneously aligned for venting. This alignment created a flow path from the drywell to the suppression chamber, which would have bypassed the pressure suppression function of the suppression chamber water volume during a Loss of Coolant Accident (LOCA). This condition existed tor approximately 43 minutes, from 2347 EDT on April 13, 2017, when Unit 2 transitioned from Mode 4 to Mode 2, until 0030 on April 14, 2017, when the proper alignment was restored. This condition is reportable in accordance with 10 CFR 50.72(b)(3)(v)(D) as a condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident. Additionally, the change from Mode 4 to Mode 2 with primary containment inoperable constitutes operation prohibited by Technical Specifications (i.e., reportable in accordance with 10 CFR 50.73(a)(2)(i)(B)).</br>The condition did not impact public health and safety. The NRC Resident Inspector has been notified.</br>Unit 2 entered Technical Specification 3.6.1.1, Primary Containment, Condition A, which requires Primary Containment to be restored to operable within 2 hours. Unit 2 exited Condition A within 43 minutes when the proper alignment was restored.es when the proper alignment was restored. +
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00:00:00, 14 April 2017 +
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>.
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