ENS 42621
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ENS Event | |
|---|---|
18:39 Jun 6, 2006 | |
| Title | Loss of "a" Train of Offsite Vital Power Due to Relay Testing |
| Event Description | Callaway plant was in mode 1 at 100 percent power. Work was in progress on calibrating lockout devices on the B switchyard buss. At approximately 1339 CDT during performance of this work, Callaway plant experienced a loss of switchyard buss B. This resulted in loss of A train offsite power, load shed on A train vital 4160 volt buss (NB01), shutdown sequencer actuation for buss NBO1, start on the A train emergency diesel generator, turbine driven auxiliary feedwater pump actuations, [and] steam generator blowdown and sample isolations. B train offsite vital power and both emergency diesel generators were available. These actuations were consistent with loss of 1 vital AC train. Emergency systems responded as expected.
As of 1630 CDT, the plant is at 100 percent power. Power has been restored to the B switchyard buss. The normal offsite supply to bus NBO1 has been restored and the diesel generator secured. Determination of the cause of the lockout device actuation is in progress. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Callaway  Missouri (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+1.02 h0.0425 days <br />0.00607 weeks <br />0.0014 months <br />) | |
| Opened: | Gary Olmstead 19:40 Jun 6, 2006 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Jun 6, 2006 |
| 42621 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 569682024-02-15T08:47:00015 February 2024 08:47:00
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