ENS 40349: Difference between revisions
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StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
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| event date = 11/21/2003 22:53 MST | | event date = 11/21/2003 22:53 MST | ||
| last update date = 11/22/2003 | | last update date = 11/22/2003 | ||
| title = Valid Actuation | | title = Valid Actuation of the "a" Emergency Diesel Generator During Testing | ||
| event text = The following event description is based on information currently available. If through subsequent reviews of this event, additional information is identified that is pertinent to this event or alters the information being provided at this time, a follow-up notification will be made via the ENS or under the reporting requirements of 10CFR50.73. | | event text = The following event description is based on information currently available. If through subsequent reviews of this event, additional information is identified that is pertinent to this event or alters the information being provided at this time, a follow-up notification will be made via the ENS or under the reporting requirements of 10CFR50.73. | ||
On November 21, 2003, at approximately 22:53 Mountain Standard Time, Palo Verde Nuclear Generating Station Unit 2 experienced a valid actuation (start) of the 'A' Emergency Diesel Generator (EDG). Unit 2 had been performing testing of the capability to parallel the EDG 'A' with the Gas Turbine Generator #1 (alternate AC Power source for station blackout.) The Train 'A' 4.16 Kv bus had been successfully transferred to the EDG and loads carried by the EDG for approximately 5 minutes. When the EDG speed control was taken from 'droop' mode (load sharing) to 'isochronous' mode (fixed frequency,) the EDG output breaker tripped opened, resulting in a valid Loss of Power (LOP) signal based on undervoltage on the Train 'A' bus. The EDG resupplied the bus in the LOP mode. | On November 21, 2003, at approximately 22:53 Mountain Standard Time, Palo Verde Nuclear Generating Station Unit 2 experienced a valid actuation (start) of the 'A' Emergency Diesel Generator (EDG). Unit 2 had been performing testing of the capability to parallel the EDG 'A' with the Gas Turbine Generator #1 (alternate AC Power source for station blackout.) The Train 'A' 4.16 Kv bus had been successfully transferred to the EDG and loads carried by the EDG for approximately 5 minutes. When the EDG speed control was taken from 'droop' mode (load sharing) to 'isochronous' mode (fixed frequency,) the EDG output breaker tripped opened, resulting in a valid Loss of Power (LOP) signal based on undervoltage on the Train 'A' bus. The EDG resupplied the bus in the LOP mode. | ||
Latest revision as of 21:24, 1 March 2018
| Where | |
|---|---|
Palo Verde  Arizona (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| LER: | 05000529/LER-2003-002 |
| Time - Person (Reporting Time:+-1.38 h-0.0575 days <br />-0.00821 weeks <br />-0.00189 months <br />) | |
| Opened: | John Gunn 04:30 Nov 22, 2003 |
| NRC Officer: | Gerry Waig |
| Last Updated: | Nov 22, 2003 |
| 40349 - NRC Website
| |