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At 1240 CDT on 9/20/2012, Operations perso … At 1240 CDT on 9/20/2012, Operations personnel determined that Browns Ferry Nuclear Plant had experienced a loss of assessment capability. The loss of assessment capability identified was due to not having functional seismic monitoring instrumentation during performance of a modification. The loss of seismic monitoring capability was determined to have existed from 8/17/2012 until 9/15/2012.</br>The ability to declare an Unusual Event per Emergency Action Level 7.1-U or an Alert per Emergency Action Level 7.1-A could potentially be hampered by the unavailability of the seismic monitoring instrumentation, because the declarations would be based on personnel feeling an earthquake. In addition, the unavailability of the seismic monitoring instrumentation could potentially hamper the operators in determining the magnitude of an earthquake in order to determine if it reached Operating Basis Earthquake levels or Safe Shutdown Earthquake levels. Therefore, this event is being considered reportable as it results in a loss of emergency assessment capability. Compensatory measures were established on 9/15/2012 which restored assessment capability.</br>This condition is reportable per 10CFR50.72(b)(3)(xiii). The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
17:40:00, 20 September 2012 +
48,327 +
20:47:00, 20 September 2012 +
17:40:00, 20 September 2012 +
At 1240 CDT on 9/20/2012, Operations perso … At 1240 CDT on 9/20/2012, Operations personnel determined that Browns Ferry Nuclear Plant had experienced a loss of assessment capability. The loss of assessment capability identified was due to not having functional seismic monitoring instrumentation during performance of a modification. The loss of seismic monitoring capability was determined to have existed from 8/17/2012 until 9/15/2012.</br>The ability to declare an Unusual Event per Emergency Action Level 7.1-U or an Alert per Emergency Action Level 7.1-A could potentially be hampered by the unavailability of the seismic monitoring instrumentation, because the declarations would be based on personnel feeling an earthquake. In addition, the unavailability of the seismic monitoring instrumentation could potentially hamper the operators in determining the magnitude of an earthquake in order to determine if it reached Operating Basis Earthquake levels or Safe Shutdown Earthquake levels. Therefore, this event is being considered reportable as it results in a loss of emergency assessment capability. Compensatory measures were established on 9/15/2012 which restored assessment capability.</br>This condition is reportable per 10CFR50.72(b)(3)(xiii). The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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, 20 September 2012 +
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>.
02:03:01, 2 March 2018 +
20:47:00, 20 September 2012 +
true +
false +
0.13 d (3.12 hours, 0.0186 weeks, 0.00427 months) +
17:40:00, 20 September 2012 +
Loss of Emergency Assessment Capability Due to Inoperable Seismic Monitoring Instrumentation +
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.