ENS 40899: Difference between revisions
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| event date = 05/30/2004 10:40 EDT | | event date = 05/30/2004 10:40 EDT | ||
| last update date = 07/27/2004 | | last update date = 07/27/2004 | ||
| title = Invalid Actuation | | title = Invalid Actuation of Containment Isolation Valves Due to Partial Loss of 120 Vac Modular Power Unit 2 Loads | ||
| event text = This 60-day optional verbal report, as allowed by 10 CFR 50.73(a)(1), is being made to describe an unplanned, invalid actuation of specified systems, specifically the Primary Containment Isolation System. Since this event meets the definition of an invalid actuation, this notification is being made in accordance with 10CFR50.73(a)(2)(iv)(A) in lieu of a Licensee Event Report. | | event text = This 60-day optional verbal report, as allowed by 10 CFR 50.73(a)(1), is being made to describe an unplanned, invalid actuation of specified systems, specifically the Primary Containment Isolation System. Since this event meets the definition of an invalid actuation, this notification is being made in accordance with 10CFR50.73(a)(2)(iv)(A) in lieu of a Licensee Event Report. | ||
On May 30, 2004, at approximately 10:40 am EDT, while the plant was operating at 100% power, a voltage regulator failed on Division 2 120 VAC Modular Power Unit No. 2 (MPU-2) which resulted in blown fuses and the loss of a number of loads from one of the three MPU-2 distribution cabinets. Since only one of the three distribution cabinets was lost, the isolations that occurred were only a portion of the isolations that would have occurred if all of the MPU-2 loads had been lost. | On May 30, 2004, at approximately 10:40 am EDT, while the plant was operating at 100% power, a voltage regulator failed on Division 2 120 VAC Modular Power Unit No. 2 (MPU-2) which resulted in blown fuses and the loss of a number of loads from one of the three MPU-2 distribution cabinets. Since only one of the three distribution cabinets was lost, the isolations that occurred were only a portion of the isolations that would have occurred if all of the MPU-2 loads had been lost. | ||
Latest revision as of 22:23, 1 March 2018
| Where | |
|---|---|
Fermi  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1391.95 h57.998 days <br />8.285 weeks <br />1.907 months <br />) | |
| Opened: | Jeff Yeager 14:37 Jul 27, 2004 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Jul 27, 2004 |
| 40899 - NRC Website
| |