ENS 47333
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ENS Event | |
|---|---|
23:19 Oct 8, 2011 | |
| Title | Notification of Unusual Event Due to Severe Electrical Fault in Rcp Junction Box |
| Event Description | Reactor Coolant Pump 2A tripped at approximately 1535 MST, resulting in numerous simultaneous electrical distribution alarms. A walkdown of containment was performed and at 1609 MST it was determined that a junction box, supplying power to the 2A Reactor Coolant Pump, had failed, resulting in the pump tripping on overcurrent protection and an 86 lockout. The plant was operating in forced circulation and had one train of shutdown cooling in service. As a result, an Emergency Classification of HU2.2, Explosion was declared due to the junction box failure and noise that had been heard in containment.
The plant is currently stable with one train of shutdown cooling in service, the opposite train of shutdown cooling is available to be placed in service. The Unit 1 Reactor Coolant System is currently at 160 degrees Fahrenheit and 375 psia with the 1A Reactor coolant pump in service for forced circulation. 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 NRC Resident Inspector has been notified. The licensee has notified appropriate state and local agencies.
The Notification of Unusual Event at Palo Verde Unit 1 was terminated at 1916 MST on 10/8/2011. The termination was based on conducting inspections which did not reveal any additional damage or plant impact as a result of this event. Unit 1 remains stable in Mode 5 with RCPs 1A and 1B in service along with one train of RHR in service. The licensee notified the NRC Resident Inspector and appropriate state and local agencies. Notified R1DO (Gray), NRR EO (Hiland), IRD (Grant), DHS (Flinter), and FEMA (Castro). |
| Where | |
|---|---|
Palo Verde  Arizona (NRC Region 4) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-3.17 h-0.132 days <br />-0.0189 weeks <br />-0.00434 months <br />) | |
| Opened: | Boris Bolf 20:09 Oct 8, 2011 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Oct 8, 2011 |
| 47333 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
Palo Verde with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | |
WEEKMONTHYEARENS 564872023-04-26T06:15:00026 April 2023 06:15:00
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Alarm ENS 514032015-09-17T06:01:00017 September 2015 06:01:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Due to Rapid Combustion of a Load Center Breaker ENS 509842015-04-15T02:20:00015 April 2015 02:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Sodium Hydroxide Spill Onsite Exceeding Reportable Quantity ENS 502372014-06-29T05:06:00029 June 2014 05:06:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - Earthquake Felt on Site ENS 494822013-10-29T13:05:00029 October 2013 13:05:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Employee Fatality ENS 493172013-09-03T02:26:0003 September 2013 02:26:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Fire in the Turbine Building ENS 491692013-07-03T07:00:0003 July 2013 07:00:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notice of Unusual Event Due to Explosion in a Non-Safety Related Load Center ENS 483472012-09-26T20:36:00026 September 2012 20:36:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Attempted Entry Onto the Site by an Illegal Alien with False Identification ENS 476882012-02-23T01:45:00023 February 2012 01:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Suspicious Package Discovered on Site ENS 473332011-10-08T23:19:0008 October 2011 23:19:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Due to Severe Electrical Fault in Rcp Junction Box ENS 470502011-07-14T21:11:00014 July 2011 21:11:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release News Release Regarding Arrest of Illegal Immigrant Working at Palo Verde ENS 466342011-02-22T16:09:00022 February 2011 16:09:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Loss of Potable Water Supply ENS 460252010-06-18T15:08:00018 June 2010 15:08:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Damaged Energized Equipment ENS 458232010-04-08T17:15:0008 April 2010 17:15:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Earthquake ENS 458112010-04-04T22:42:0004 April 2010 22:42:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to an Earthquake ENS 457842010-03-23T01:11:00023 March 2010 01:11:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Due to Unidentified Leakage Greater than 10 Gpm ENS 457482010-03-07T18:24:0007 March 2010 18:24:00 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Due to Electrical Fault Causing Damage to Equipment ENS 444012008-08-08T22:20:0008 August 2008 22:20:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification to Maricopa County Environmental Services ENS 438762007-12-31T15:40:00031 December 2007 15:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Death of an Employee Outside the Protected Area ENS 437642007-11-02T14:44:0002 November 2007 14:44:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Suspicious Explosive Device Discovered in Vehicle at Oca Access Checkpoint ENS 423812006-03-02T21:30:0002 March 2006 21:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification ENS 421012005-10-31T19:02:00031 October 2005 19:02:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Media Interest ENS 419602005-08-29T17:30:00029 August 2005 17:30:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Off Site Notifications Due to Loss of Inoperable Emergency Evacuation Siren ENS 419412005-08-23T20:49:00023 August 2005 20:49:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Two Emergency Sirens Inoperable ENS 419122005-08-11T15:45:00011 August 2005 15:45:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness One Emergency Preparedness Siren Out of Service ENS 418102005-06-29T11:43:00029 June 2005 11:43:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Evacuation Siren Inoperable ENS 414972005-03-16T01:51:00016 March 2005 01:51:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notifications Due to Caustic Spill ENS 412682004-12-17T17:53:00017 December 2004 17:53:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notifications Made Due to Spill of Approximately 1400 Pounds of Sulfuric Acid ENS 408162004-06-14T14:44:00014 June 2004 14:44:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Due to Reactor Trip Due to Loss of Off Site Power ENS 408152004-06-14T14:44:00014 June 2004 14:44:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Unusual Event Declared Due to Reactor Trip Due to Loss of Off Site Power ENS 408142004-06-14T14:44:00014 June 2004 14:44:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation Alert Declared - Reactor Trip Due to Loss of Off Site Power ENS 406802004-04-17T14:26:00017 April 2004 14:26:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Small Fire at Palo Verde 1: Two Employees Injured, No Plant Equipment Damage ENS 405612004-03-01T23:49:0001 March 2004 23:49:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Press Release Regarding Boron Residue ENS 405332004-02-20T17:33:00020 February 2004 17:33:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to a Press Release Concerning the Unit 2 Shutdown 2023-04-26T06:15:00 | |
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