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On August 12, 2005, at approximately 00:19 … On August 12, 2005, at approximately 00:19 hours Mountain Standard Time (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 diesel generators (DGs) each capable of supplying one train of the onsite Class 1E AC Electrical Power Distribution System be available. On August 9, 2005, at approximately 04:20 MST, Unit 1 Diesel Generator 'B' failed to maintain the proper steady state output voltage (4080-4300 VAC) during monthly operability surveillance testing per '40ST-9DG02'. Diesel Generator 'B' was declared inoperable and the Unit entered LCO 3.8.1 action 'B'. An engineering action plan was initiated in an attempt to identify the cause of the generator output voltage fluctuation and correct the problem. To date, troubleshooting efforts have unable to isolate the problem. On August 12 at 0420 MST the 72 hour Completion Time associated with LCO 3.8.1 Action 'B' will expire and at 00:19 MST Unit 1 commenced a reactor shutdown in compliance with LCO 3.8.1 Action 'H'.</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. The required offsite power sources are operable and the electrical grid is stable.</br>The NRC Resident Inspector will be notified.e NRC Resident Inspector will be notified. +
07:19:00, 12 August 2005 +
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03:26:00, 12 August 2005 +
07:19:00, 12 August 2005 +
On August 12, 2005, at approximately 00:19 … On August 12, 2005, at approximately 00:19 hours Mountain Standard Time (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 diesel generators (DGs) each capable of supplying one train of the onsite Class 1E AC Electrical Power Distribution System be available. On August 9, 2005, at approximately 04:20 MST, Unit 1 Diesel Generator 'B' failed to maintain the proper steady state output voltage (4080-4300 VAC) during monthly operability surveillance testing per '40ST-9DG02'. Diesel Generator 'B' was declared inoperable and the Unit entered LCO 3.8.1 action 'B'. An engineering action plan was initiated in an attempt to identify the cause of the generator output voltage fluctuation and correct the problem. To date, troubleshooting efforts have unable to isolate the problem. On August 12 at 0420 MST the 72 hour Completion Time associated with LCO 3.8.1 Action 'B' will expire and at 00:19 MST Unit 1 commenced a reactor shutdown in compliance with LCO 3.8.1 Action 'H'.</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. The required offsite power sources are operable and the electrical grid is stable.</br>The NRC Resident Inspector will be notified.e NRC Resident Inspector will be notified. +
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94 +
00:00:00, 12 August 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>.
02:20:26, 2 March 2018 +
03:26:00, 12 August 2005 +
true +
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-0.162 d (-3.88 hours, -0.0231 weeks, -0.00531 months) +
07:19:00, 12 August 2005 +
Plant Entered Lco Action Statement 3.8.1 to Be in Mode 5 Due to Unit 1 "B" Diesel Gen. Being Declared Inoperable +
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