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The following information was provided by … The following information was provided by the licensee via phone and email:</br>On 08/20/2025 at 2308 EDT, the Fermi 2 active seismic monitoring system provided indication of a potential seismic activity event. Plant abnormal procedures were entered, and compensatory measures were met and remain in place. Neither the United States Geological Survey (USGS) nor the next closest nuclear power plant could confirm/validate the readings obtained at Fermi. The seismic monitoring system was declared inoperable to validate the calibration of the system. Fermi 2 has two active seismic monitors: one on the reactor pressure vessel pedestal and one in the high pressure core injection (HPCI) room. Only the HPCI room seismic monitor was declared inoperable. The HPCI room accelerometer is the sole trigger for the seismic recording system (which outputs peak accelerations experienced during a seismic event) and the associated control room alarm. This is used in assessment of the magnitude of an earthquake for emergency action level HU 2.1.</br>The loss of the active seismic monitoring system is reportable within 8 hours of discovery in accordance with 10 CFR 50.72(b)(3)(xiii).</br>No seismic activity has been felt on-site, and the USGS recorded no seismic activity in the area.</br>The NRC Resident Inspector has been notified.</br>An alternative means of monitoring seismic event entry is still available per the emergency plan via USGS.available per the emergency plan via USGS. +
03:08:00, 21 August 2025 +
02:23:00, 21 August 2025 +
03:08:00, 21 August 2025 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>On 08/20/2025 at 2308 EDT, the Fermi 2 active seismic monitoring system provided indication of a potential seismic activity event. Plant abnormal procedures were entered, and compensatory measures were met and remain in place. Neither the United States Geological Survey (USGS) nor the next closest nuclear power plant could confirm/validate the readings obtained at Fermi. The seismic monitoring system was declared inoperable to validate the calibration of the system. Fermi 2 has two active seismic monitors: one on the reactor pressure vessel pedestal and one in the high pressure core injection (HPCI) room. Only the HPCI room seismic monitor was declared inoperable. The HPCI room accelerometer is the sole trigger for the seismic recording system (which outputs peak accelerations experienced during a seismic event) and the associated control room alarm. This is used in assessment of the magnitude of an earthquake for emergency action level HU 2.1.</br>The loss of the active seismic monitoring system is reportable within 8 hours of discovery in accordance with 10 CFR 50.72(b)(3)(xiii).</br>No seismic activity has been felt on-site, and the USGS recorded no seismic activity in the area.</br>The NRC Resident Inspector has been notified.</br>An alternative means of monitoring seismic event entry is still available per the emergency plan via USGS.available per the emergency plan via USGS. +
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
100 +
00:00:00, 21 August 2025 +
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>.
11:20:03, 25 August 2025 +
02:23:00, 21 August 2025 +
true +
false +
-0.0313 d (-0.75 hours, -0.00446 weeks, -0.00103 months) +
03:08:00, 21 August 2025 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.