ENS 42621: Difference between revisions
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| event date = 06/06/2006 13:39 CDT | | event date = 06/06/2006 13:39 CDT | ||
| last update date = 06/06/2006 | | last update date = 06/06/2006 | ||
| title = Loss | | title = Loss of "a" Train of Offsite Vital Power Due to Relay Testing | ||
| event text = 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. | | event text = 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. | 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. | ||
Latest revision as of 22:18, 1 March 2018
| 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
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