ENS 43393: Difference between revisions
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StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
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| event date = 05/28/2007 22:50 PDT | | event date = 05/28/2007 22:50 PDT | ||
| last update date = 05/29/2007 | | last update date = 05/29/2007 | ||
| title = Emergency Diesel Generator Actuation Due | | title = Emergency Diesel Generator Actuation Due to Momentary Undervoltage Condition | ||
| event text = Unit 1 was making preparations to parallel to the grid on 5/28/07. All busses had been transferred to the Startup power supply (230 KV System). Operations then started a large 12KV motor, Circulating Water pump 1-2. Starting this large motor caused a momentary dip in startup voltage. This voltage dip was sufficient to pick up the undervoltage relay on vital bus G, causing a start of that bus's Emergency Diesel Generator (EDG). The bus remained supplied by the startup power supply, the EDG did not load. This valid start of EDG 1-2 is being reported per 10CFR50.72(b)(3)(iv)(A). | | event text = Unit 1 was making preparations to parallel to the grid on 5/28/07. All busses had been transferred to the Startup power supply (230 KV System). Operations then started a large 12KV motor, Circulating Water pump 1-2. Starting this large motor caused a momentary dip in startup voltage. This voltage dip was sufficient to pick up the undervoltage relay on vital bus G, causing a start of that bus's Emergency Diesel Generator (EDG). The bus remained supplied by the startup power supply, the EDG did not load. This valid start of EDG 1-2 is being reported per 10CFR50.72(b)(3)(iv)(A). | ||
The EDG was subsequently shut down and returned to it's normal standby condition. | The EDG was subsequently shut down and returned to it's normal standby condition. | ||
Latest revision as of 21:16, 1 March 2018
| Where | |
|---|---|
Diablo Canyon  California (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| LER: | 05000275/LER-2007-003 Emergency Diesel Generator Actuation Due to a Transient Undervoltage Condition |
| Time - Person (Reporting Time:+-0.82 h-0.0342 days <br />-0.00488 weeks <br />-0.00112 months <br />) | |
| Opened: | Gary Anderson 05:01 May 29, 2007 |
| NRC Officer: | Bill Huffman |
| Last Updated: | May 29, 2007 |
| 43393 - NRC Website
| |