Browse wiki
Jump to navigation
Jump to search
The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 1924 MST on April 8, 2025, a loss of power (LOP) occurred to 'Train-A' 4.16 kV class 1E electrical bus while re-energizing 'Train-A' balance of plant (BOP) engineered safety features actuation system (ESFAS) from pre-planned maintenance. The LOP occurred when the circuit breaker supplying off-site power to the 'Train-A' 4.16 kV class 1E bus tripped when 'Train-A' BOP ESFAS system was re-energized. Operators restored power to 'Train-A' 4.16 kV class 1E bus with 'EDG-A' (emergency diesel generator for 'Train-A') at 1934 MST. Operators restored all necessary plant loads which had lost power. Per the Palo Verde emergency plan, no emergency classification was required.</br>At the time of the LOP, the reactor was defueled with the core offloaded to the spent fuel pool.</br>Unit 2 and Unit 3 are not impacted by this event and remain in mode 1, 100 percent power.</br>The cause of the circuit breaker supplying off-site power to the 'Train-A' 4.16 kV class 1E bus tripping is under investigation. NRC Resident Inspector has been notified.</br>This event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that resulted in a valid actuation of emergency AC electrical power systems. of emergency AC electrical power systems. +
02:24:00, 9 April 2025 +
57,656 +
03:26:00, 9 April 2025 +
02:24:00, 9 April 2025 +
The following information was provided by … The following information was provided by the licensee via phone and email:</br>At 1924 MST on April 8, 2025, a loss of power (LOP) occurred to 'Train-A' 4.16 kV class 1E electrical bus while re-energizing 'Train-A' balance of plant (BOP) engineered safety features actuation system (ESFAS) from pre-planned maintenance. The LOP occurred when the circuit breaker supplying off-site power to the 'Train-A' 4.16 kV class 1E bus tripped when 'Train-A' BOP ESFAS system was re-energized. Operators restored power to 'Train-A' 4.16 kV class 1E bus with 'EDG-A' (emergency diesel generator for 'Train-A') at 1934 MST. Operators restored all necessary plant loads which had lost power. Per the Palo Verde emergency plan, no emergency classification was required.</br>At the time of the LOP, the reactor was defueled with the core offloaded to the spent fuel pool.</br>Unit 2 and Unit 3 are not impacted by this event and remain in mode 1, 100 percent power.</br>The cause of the circuit breaker supplying off-site power to the 'Train-A' 4.16 kV class 1E bus tripping is under investigation. NRC Resident Inspector has been notified.</br>This event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that resulted in a valid actuation of emergency AC electrical power systems. of emergency AC electrical power systems. +
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>.
00:00:00, 9 April 2025 +
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>.
11:20:07, 11 April 2025 +
03:26:00, 9 April 2025 +
false +
false +
0.0429 d (1.03 hours, 0.00613 weeks, 0.00141 months) +
02:24:00, 9 April 2025 +
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.