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On December 31, 2004, at approximately 10: … On December 31, 2004, at approximately 10:42 Mountain Standard Time (MST) a valid actuation of the Palo Verde Nuclear Generating Station Unit 2 Train A Emergency Diesel Generator (EDG) and Unit 3 Train B EDG occurred as a result of undervoltage on their respective safety buses. Both EDGs started and loaded as designed. </br>The loss of power to the two safety buses was the result of the deenergization of Startup Transformer X01 when Westwing transmission line #2, one of seven 525 kV transmission lines at the Palo Verde switchyard, relayed off. Prior to the event, maintenance and testing were in progress on Westwing Line #1. The apparent cause of the event was inadvertent operation of an adjacent Line #2 protective relay while testing Line #1.</br>Both Units 2 and 3 entered Technical Specification LCO 3.8.1 Condition A for one (of two) required offsite circuits inoperable. Normal offsite power was restored to each safety bus in Units 2 and 3 (at 11:45 MST), the LCO exited and the Unit 3 EDG returned to standby. During shutdown of the Unit 2 A EDG following successful loading of the Safety bus, the EDG was declared inoperable due to a Jacket Water leak and LCO 3.8.1 Condition B was entered. No Emergency Plan declaration was made and none was required.</br>Both units were at approximately 100% power, at normal operating temperature and pressure prior to and following the EDG actuations. No other ESF actuations occurred and none were required. No major equipment was inoperable prior to the event that contributed to the event. The event did not result in any challenges to fission product barriers and there were no adverse safety consequences as a result of this event. The event did not adversely affect the safe operation of the plant or the health and safety of the public.</br>The NRC Resident Inspector has been notified of the ESF actuation and this ENS notification.e ESF actuation and this ENS notification. +
17:42:00, 31 December 2004 +
41,304 +
15:15:00, 31 December 2004 +
17:42:00, 31 December 2004 +
On December 31, 2004, at approximately 10: … On December 31, 2004, at approximately 10:42 Mountain Standard Time (MST) a valid actuation of the Palo Verde Nuclear Generating Station Unit 2 Train A Emergency Diesel Generator (EDG) and Unit 3 Train B EDG occurred as a result of undervoltage on their respective safety buses. Both EDGs started and loaded as designed. </br>The loss of power to the two safety buses was the result of the deenergization of Startup Transformer X01 when Westwing transmission line #2, one of seven 525 kV transmission lines at the Palo Verde switchyard, relayed off. Prior to the event, maintenance and testing were in progress on Westwing Line #1. The apparent cause of the event was inadvertent operation of an adjacent Line #2 protective relay while testing Line #1.</br>Both Units 2 and 3 entered Technical Specification LCO 3.8.1 Condition A for one (of two) required offsite circuits inoperable. Normal offsite power was restored to each safety bus in Units 2 and 3 (at 11:45 MST), the LCO exited and the Unit 3 EDG returned to standby. During shutdown of the Unit 2 A EDG following successful loading of the Safety bus, the EDG was declared inoperable due to a Jacket Water leak and LCO 3.8.1 Condition B was entered. No Emergency Plan declaration was made and none was required.</br>Both units were at approximately 100% power, at normal operating temperature and pressure prior to and following the EDG actuations. No other ESF actuations occurred and none were required. No major equipment was inoperable prior to the event that contributed to the event. The event did not result in any challenges to fission product barriers and there were no adverse safety consequences as a result of this event. The event did not adversely affect the safe operation of the plant or the health and safety of the public.</br>The NRC Resident Inspector has been notified of the ESF actuation and this ENS notification.e ESF actuation and this ENS notification. +
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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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17:42:00, 31 December 2004 +
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