Browse wiki
Jump to navigation
Jump to search
85 +
The following event description is based o … The following event description is based on information currently available. If through subsequent reviews of this event, additional information is identified that is pertinent to this event or alters the information being provided at this time, a follow-up notification will be made via the ENS or under the reporting requirements of 10CFR50.73.</br>On February 9, 2005, at approximately 01:04 MST, Palo Verde Nuclear Generating Station (PVNGS) Unit 1 commenced a reactor shutdown required by Technical Specification 3.8.1.</br>Limiting Condition for Operability (LCO) 3.8.1 requires two independent AC sources be available. On February 6, 2005, at approximately 22:19 Mountain Standard Time (MST) a valid actuation of the Palo Verde Nuclear Generating Station Unit 1 Train 'B' Emergency Diesel Generator (EDG) occurred as a result of under-voltage on its respective safety bus (PBB-S04). EDG 'B' started and loaded as designed to energize PBB-S04. (Reference EN #41379 reported on 02/06/2005).</br>The loss of power to the safety bus was the result of a fault associated with 13.8KV breaker NAN-SO6J which caused breakers NAN-S06H (normal power supply), NAN-S06K (alternate power supply), and NAN-S06J (EOF & TSC Bldg power supply) to all trip open on over-current. This action resulted in the de-energization of NAN-SO6, NAN-S04, and PBB-S04. PVNGS will be unable to make repairs and restore the required second independent AC power source with the allowed 72 hour required action time frame.</br>The event did not result in the release of radioactivity to the environment and did not adversely affect the safe operation of the plant or health and safety of the public.</br>The NRC Resident Inspector has been notified.
The NRC Resident Inspector has been notified. +
08:04:00, 9 February 2005 +
03:31:00, 9 February 2005 +
08:04:00, 9 February 2005 +
The following event description is based o … The following event description is based on information currently available. If through subsequent reviews of this event, additional information is identified that is pertinent to this event or alters the information being provided at this time, a follow-up notification will be made via the ENS or under the reporting requirements of 10CFR50.73.</br>On February 9, 2005, at approximately 01:04 MST, Palo Verde Nuclear Generating Station (PVNGS) Unit 1 commenced a reactor shutdown required by Technical Specification 3.8.1.</br>Limiting Condition for Operability (LCO) 3.8.1 requires two independent AC sources be available. On February 6, 2005, at approximately 22:19 Mountain Standard Time (MST) a valid actuation of the Palo Verde Nuclear Generating Station Unit 1 Train 'B' Emergency Diesel Generator (EDG) occurred as a result of under-voltage on its respective safety bus (PBB-S04). EDG 'B' started and loaded as designed to energize PBB-S04. (Reference EN #41379 reported on 02/06/2005).</br>The loss of power to the safety bus was the result of a fault associated with 13.8KV breaker NAN-SO6J which caused breakers NAN-S06H (normal power supply), NAN-S06K (alternate power supply), and NAN-S06J (EOF & TSC Bldg power supply) to all trip open on over-current. This action resulted in the de-energization of NAN-SO6, NAN-S04, and PBB-S04. PVNGS will be unable to make repairs and restore the required second independent AC power source with the allowed 72 hour required action time frame.</br>The event did not result in the release of radioactivity to the environment and did not adversely affect the safe operation of the plant or health and safety of the public.</br>The NRC Resident Inspector has been notified.
The 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, 9 February 2005 +
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>.
02:21:49, 2 March 2018 +
03:31:00, 9 February 2005 +
true +
false +
-0.19 d (-4.55 hours, -0.0271 weeks, -0.00623 months) +
08:04:00, 9 February 2005 +
Technical Specifications Required Shutdown Due to Loss of Normal and Alternate Power to Safety Bus +
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.