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The following event description is based o … The following event description is based on information currently available. If through subsequent reviews of this</br>event, additional information is identified that is pertinent to this event or alters the information being provided at this</br>time, a follow-up notification will be made via the ENS or under the reporting requirements of 10CFR50.73.</br>On June 18, 2006, at approximately 1455 Mountain Standard Time (MST), Palo Verde Nuclear Generating Station</br>Unit 1 was operating at 0% power in Mode 6 with the 'A' Emergency Diesel Generator (EDG) inoperable for troubleshooting of the train 'A' load sequencer, The 'B' EDG failed to start during a test run resulting in a loss of the onsite emergency power safety function required by General Design Criterion (GDC) 17. The offsite power source safety function remains available to the plant.</br>The unit entered Technical Specification 3.8.2, AC Sources - Shutdown Condition B for one required DG inoperable.</br>There was no movement of irradiated fuel assemblies, therefore the unit remained in compliance with the Required</br>Actions. The offsite electrical grid is stable.</br>At 1810 MST the 'A' EDG was declared operable, exiting Technical Specification 3.8.2. With the 'A' EDG operable,</br>the safety function for the onsite emergency power was also restored.</br>There were no structures, systems or components that were inoperable at the start of event that contributed to the</br>event. This condition did not result in any challenges to the fission product barrier or result in any releases of</br>radioactive materials. There were no adverse safety consequences or implications as a result of this event. This</br>condition 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 of this condition and this ENS notification.</br>* * * RETRACTION RECEIVED VIA E-MAIL FROM DAN HAUTALA TO JOE O'HARA AT 1702 ON 7/5/06 * * * </br> Further evaluation has determined that this event is not reportable. In the 'test' mode, an 'Incomplete Sequence' trip is enabled and functions on an engine start to trip the engine if starting air is not terminated within 15 seconds. Due to a delay in opening the engine fuel racks by the test mode pneumatic control valve loop, the 'Incomplete Sequence' trip actuated. During an emergency start, the electrically operated emergency fuel solenoids control the operation of the engine fuel racks and the 'Incomplete Sequence' trip function is bypassed. Engineering evaluation found none of the equipment required to operate the 'B' EDG in the emergency mode degraded or malfunctioning. The 'B' EDG was still capable of performing its design function and was 'OPERABLE'. Additionally, it was determined that the 'A' EDG was fully functional and in a standby condition, capable of performing its design function at the time the 'B' EDG test run trip occurred.</br>Therefore, this condition is not reportable per 10CFR50.72(2)(b)(v)(B) or (2)(b)(v)(D)." </br>The licensee notified the NRC Resident Inspector. R4DO(Pick) has been notified. Inspector. R4DO(Pick) has been notified.
21:55:00, 18 June 2006 +
42,651 +
00:29:00, 19 June 2006 +
21:55:00, 18 June 2006 +
The following event description is based o … The following event description is based on information currently available. If through subsequent reviews of this</br>event, additional information is identified that is pertinent to this event or alters the information being provided at this</br>time, a follow-up notification will be made via the ENS or under the reporting requirements of 10CFR50.73.</br>On June 18, 2006, at approximately 1455 Mountain Standard Time (MST), Palo Verde Nuclear Generating Station</br>Unit 1 was operating at 0% power in Mode 6 with the 'A' Emergency Diesel Generator (EDG) inoperable for troubleshooting of the train 'A' load sequencer, The 'B' EDG failed to start during a test run resulting in a loss of the onsite emergency power safety function required by General Design Criterion (GDC) 17. The offsite power source safety function remains available to the plant.</br>The unit entered Technical Specification 3.8.2, AC Sources - Shutdown Condition B for one required DG inoperable.</br>There was no movement of irradiated fuel assemblies, therefore the unit remained in compliance with the Required</br>Actions. The offsite electrical grid is stable.</br>At 1810 MST the 'A' EDG was declared operable, exiting Technical Specification 3.8.2. With the 'A' EDG operable,</br>the safety function for the onsite emergency power was also restored.</br>There were no structures, systems or components that were inoperable at the start of event that contributed to the</br>event. This condition did not result in any challenges to the fission product barrier or result in any releases of</br>radioactive materials. There were no adverse safety consequences or implications as a result of this event. This</br>condition 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 of this condition and this ENS notification.</br>* * * RETRACTION RECEIVED VIA E-MAIL FROM DAN HAUTALA TO JOE O'HARA AT 1702 ON 7/5/06 * * * </br> Further evaluation has determined that this event is not reportable. In the 'test' mode, an 'Incomplete Sequence' trip is enabled and functions on an engine start to trip the engine if starting air is not terminated within 15 seconds. Due to a delay in opening the engine fuel racks by the test mode pneumatic control valve loop, the 'Incomplete Sequence' trip actuated. During an emergency start, the electrically operated emergency fuel solenoids control the operation of the engine fuel racks and the 'Incomplete Sequence' trip function is bypassed. Engineering evaluation found none of the equipment required to operate the 'B' EDG in the emergency mode degraded or malfunctioning. The 'B' EDG was still capable of performing its design function and was 'OPERABLE'. Additionally, it was determined that the 'A' EDG was fully functional and in a standby condition, capable of performing its design function at the time the 'B' EDG test run trip occurred.</br>Therefore, this condition is not reportable per 10CFR50.72(2)(b)(v)(B) or (2)(b)(v)(D)." </br>The licensee notified the NRC Resident Inspector. R4DO(Pick) has been notified. Inspector. R4DO(Pick) has been notified.
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00:00:00, 5 July 2006 +
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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21:55:00, 18 June 2006 +
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.