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At 0449 CDT on July 26, 2015, the station' … At 0449 CDT on July 26, 2015, the station's Seismic Instrumentation generated a seismic event alarm that was determined to be invalid based upon no seismic activity being felt on site, and no activity detected in the area by either the National Earthquake Information Center, or nearby Exelon plants. The instrumentation that actuated recorded a value of 0.0449 g on a single axis of one instrument, which is greater than the 0.02 g threshold value in the Emergency Action Level in the station's emergency procedures; however, no other instrument channel or axis indicated a valid event exceeding the 0.02 g threshold. Since the event alarm was determined to be invalid as described above, no EAL thresholds were met. </br>The seismic instrumentation was declared non-functional since it would not generate a seismic event alarm during an actual event until the invalid event was reset. The alarm was reset through the alarm reset process. The seismic instrumentation was declared functional and returned to service at 0520.</br>This resulted in a Loss of Emergency Assessment Capability while the Seismic Instrumentation was out of service. This is a reportable condition in accordance with 10 CFR 50.72(b)(3)(xiii). </br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
09:49:00, 26 July 2015 +
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11:50:00, 26 July 2015 +
09:49:00, 26 July 2015 +
At 0449 CDT on July 26, 2015, the station' … At 0449 CDT on July 26, 2015, the station's Seismic Instrumentation generated a seismic event alarm that was determined to be invalid based upon no seismic activity being felt on site, and no activity detected in the area by either the National Earthquake Information Center, or nearby Exelon plants. The instrumentation that actuated recorded a value of 0.0449 g on a single axis of one instrument, which is greater than the 0.02 g threshold value in the Emergency Action Level in the station's emergency procedures; however, no other instrument channel or axis indicated a valid event exceeding the 0.02 g threshold. Since the event alarm was determined to be invalid as described above, no EAL thresholds were met. </br>The seismic instrumentation was declared non-functional since it would not generate a seismic event alarm during an actual event until the invalid event was reset. The alarm was reset through the alarm reset process. The seismic instrumentation was declared functional and returned to service at 0520.</br>This resulted in a Loss of Emergency Assessment Capability while the Seismic Instrumentation was out of service. This is a reportable condition in accordance with 10 CFR 50.72(b)(3)(xiii). </br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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99 +
00:00:00, 26 July 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>.
22:17:27, 24 September 2017 +
11:50:00, 26 July 2015 +
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0.0842 d (2.02 hours, 0.012 weeks, 0.00277 months) +
09:49:00, 26 July 2015 +
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