ENS 41304: Difference between revisions
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| event date = 12/31/2004 10:42 MST | | event date = 12/31/2004 10:42 MST | ||
| last update date = 12/31/2004 | | last update date = 12/31/2004 | ||
| title = Plant Had Auto Start | | title = Plant Had Auto Start and Loading of Two Emergency Diesel Gererators | ||
| event text = 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. | | event text = 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. | ||
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. | 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. | ||
Latest revision as of 21:22, 1 March 2018
| Where | |
|---|---|
Palo Verde  Arizona (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| LER: | 05000529/LER-2004-003 Regarding Actuation of Plant Emergency Diesel Generators |
| Time - Person (Reporting Time:+-2.45 h-0.102 days <br />-0.0146 weeks <br />-0.00336 months <br />) | |
| Opened: | Brad Robinson 15:15 Dec 31, 2004 |
| NRC Officer: | Chauncey Gould |
| Last Updated: | Dec 31, 2004 |
| 41304 - NRC Website
| |