ENS 43817: Difference between revisions
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| event date = 12/01/2007 14:35 CST | | event date = 12/01/2007 14:35 CST | ||
| last update date = 12/01/2007 | | last update date = 12/01/2007 | ||
| title = Automatic Edg Starts | | title = Automatic Edg Starts on 161 Kv Line Transient | ||
| event text = This report is being made under 10CFR50.72(b)(3)(iv)(A), 'Any event or condition that results in valid actuation of any of the systems listed in paragraph (b)(3)(iv)(B) of this section' due to the Auto Start of the 'A' and 'B' Standby Diesel Generators. | | event text = This report is being made under 10CFR50.72(b)(3)(iv)(A), 'Any event or condition that results in valid actuation of any of the systems listed in paragraph (b)(3)(iv)(B) of this section' due to the Auto Start of the 'A' and 'B' Standby Diesel Generators. | ||
The Auto start of the 'A' and 'B' Standby Diesel Generators occurred on a valid bus undervoltage condition caused by a transient on the 161 kV Fairfax line. The Standby Diesel Generator Feeder Breakers did not close onto their respective Essential buses. The Essential buses were not required to load onto either diesel as they remained powered from the 1X003 Start-up Transformer during and after the event. Offsite power remained fully operable during and following the event. The Standby Diesel Generators have been returned to the standby/ready condition. | The Auto start of the 'A' and 'B' Standby Diesel Generators occurred on a valid bus undervoltage condition caused by a transient on the 161 kV Fairfax line. The Standby Diesel Generator Feeder Breakers did not close onto their respective Essential buses. The Essential buses were not required to load onto either diesel as they remained powered from the 1X003 Start-up Transformer during and after the event. Offsite power remained fully operable during and following the event. The Standby Diesel Generators have been returned to the standby/ready condition. | ||
Latest revision as of 22:15, 1 March 2018
| Where | |
|---|---|
Duane Arnold  Iowa (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| LER: | 05000331/LER-2007-011 |
| Time - Person (Reporting Time:+-2.17 h-0.0904 days <br />-0.0129 weeks <br />-0.00297 months <br />) | |
| Opened: | Hans Olson 18:25 Dec 1, 2007 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Dec 1, 2007 |
| 43817 - NRC Website
| |