ENS 40648: Difference between revisions
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| event date = 04/05/2004 20:30 EDT | | event date = 04/05/2004 20:30 EDT | ||
| last update date = 04/06/2004 | | last update date = 04/06/2004 | ||
| title = Offsite Electrical Power Sources | | title = Offsite Electrical Power Sources and 1E 4Kv Distribution Buses Inoperable | ||
| event text = On 04/05/04 at 2030 hours, Engineering personnel informed Operations personnel of an issue affecting the ability of the offsite power sources to provide adequate 1E bus voltage consistent with the design basis. Operating procedures currently contain non-conservative values for minimum voltage on 1E 4 kV buses. In addition, the transformer auto load tap changer (LTC) is currently set to regulate at approximately 4200 VAC, a value that is below the required 1E 4 kV bus lower voltage design limit. Adequate voltage from the offsite power sources is required IAW General Design Criteria 17 to ensure that vital buses remain connected to their preferred power source and adequate terminal voltage exists at the load end device during accident conditions. The ability of the Emergency Diesel Generators to perform their design function is not affected by this condition. This event is being reported in accordance with 10CFR50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of a safety function because it affects the ability of both offsite power sources to provide adequate voltage to all 1E buses to properly mitigate the consequences of an accident. | | event text = On 04/05/04 at 2030 hours, Engineering personnel informed Operations personnel of an issue affecting the ability of the offsite power sources to provide adequate 1E bus voltage consistent with the design basis. Operating procedures currently contain non-conservative values for minimum voltage on 1E 4 kV buses. In addition, the transformer auto load tap changer (LTC) is currently set to regulate at approximately 4200 VAC, a value that is below the required 1E 4 kV bus lower voltage design limit. Adequate voltage from the offsite power sources is required IAW General Design Criteria 17 to ensure that vital buses remain connected to their preferred power source and adequate terminal voltage exists at the load end device during accident conditions. The ability of the Emergency Diesel Generators to perform their design function is not affected by this condition. This event is being reported in accordance with 10CFR50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of a safety function because it affects the ability of both offsite power sources to provide adequate voltage to all 1E buses to properly mitigate the consequences of an accident. | ||
Both offsite electrical power sources and all four 4 kV distribution buses have been declared inoperable and the appropriate Technical Specification Actions have been entered. The current voltage readings for all 1E 4 kV buses are between 4204 and 4263 VAC. The plant will remain in Operational Condition 4 until this condition is corrected. Engineering and Operations personnel are evaluating this condition to determine required corrective actions. All other plant systems are available to support Operational Condition change and reactor startup. | Both offsite electrical power sources and all four 4 kV distribution buses have been declared inoperable and the appropriate Technical Specification Actions have been entered. The current voltage readings for all 1E 4 kV buses are between 4204 and 4263 VAC. The plant will remain in Operational Condition 4 until this condition is corrected. Engineering and Operations personnel are evaluating this condition to determine required corrective actions. All other plant systems are available to support Operational Condition change and reactor startup. | ||
Latest revision as of 21:23, 1 March 2018
| Where | |
|---|---|
Hope Creek  New Jersey (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+1.78 h0.0742 days <br />0.0106 weeks <br />0.00244 months <br />) | |
| Opened: | Art Bready 02:17 Apr 6, 2004 |
| NRC Officer: | Mike Ripley |
| Last Updated: | Apr 6, 2004 |
| 40648 - NRC Website
| |
Hope Creek with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |