ENS 50586: Difference between revisions
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| event date = 10/31/2014 17:40 PDT | | event date = 10/31/2014 17:40 PDT | ||
| last update date = 11/01/2014 | | last update date = 11/01/2014 | ||
| title = Automatic Emergency Diesel Generator Start Due | | title = Automatic Emergency Diesel Generator Start Due to Loss of Offsite 230Kv Startup Power Supply | ||
| event text = At 1740 PDT, Diablo Canyon Power Plant experienced a loss of the offsite 230 kV startup power source. This was due to a 230 kV switchyard bus differential relay actuation during a rainstorm, resulting in valid anticipatory starts of each unit's three emergency diesel generators. All diesels successfully started but were not loaded. All systems operated as designed with no problems observed. | | event text = At 1740 PDT, Diablo Canyon Power Plant experienced a loss of the offsite 230 kV startup power source. This was due to a 230 kV switchyard bus differential relay actuation during a rainstorm, resulting in valid anticipatory starts of each unit's three emergency diesel generators. All diesels successfully started but were not loaded. All systems operated as designed with no problems observed. | ||
The 230 kV startup power source is the offsite power system designed to be immediately available following an accident. However, the safety related onsite emergency diesel system would have provided power to mitigate the consequences of an accident while the 230 kV [supply] was unavailable. | The 230 kV startup power source is the offsite power system designed to be immediately available following an accident. However, the safety related onsite emergency diesel system would have provided power to mitigate the consequences of an accident while the 230 kV [supply] was unavailable. | ||
Latest revision as of 21:49, 1 March 2018
| Where | |
|---|---|
Diablo Canyon  California (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+1.45 h0.0604 days <br />0.00863 weeks <br />0.00199 months <br />) | |
| Opened: | Wes Fiant 02:07 Nov 1, 2014 |
| NRC Officer: | Daniel Mills |
| Last Updated: | Nov 1, 2014 |
| 50586 - NRC Website
| |