ENS 45715
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ENS Event | |
|---|---|
03:45 Feb 20, 2010 | |
| Title | Specified System Actuations Due to Loss of the 'A' Safeguards Transformer |
| Event Description | At 2145 CST on 2/19/2010, the Callaway Plant experienced a loss of switchyard bus 'A'. This resulted in a loss of off site power to 'B' train vital 4160 volt bus NB02. Technical specification LCO 3.8.1 was entered. The 'B' train emergency diesel generator started and the shutdown sequencer actuated for bus NB02. 'B' motor driven auxiliary feed water pump, 'B' centrifugal charging pump, and both 'A' and 'B' essential service water pumps started. The turbine driven auxiliary feed water pump actuated, and steam generator blowdown and sample isolation occurred. 'A' train offsite vital power and emergency diesel generator were available. The actuations that occurred were consistent with the loss of one vital AC train. All emergency systems responded as expected with the exception of steam generator blowdown valve BMHV0002 which was manually isolated when it failed to fully close.
The loss of switchyard bus 'A' was due to a fault on the 'A' safeguards transformer. The faulted transformer has been isolated, and switchyard bus 'A' was reenergized at 0132 on 2/20/2010. The 'B' train vital 4160 volt bus NB02 was tied to offsite power at 0222 on 2/20/2010, and the 'B' emergency diesel generator was secured at 0233 on 2/20/2010. Technical specification LCO 3.8.1 was exited. Currently the plant is at 100% power. The licensee has 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:+0.07 h0.00292 days <br />4.166667e-4 weeks <br />9.5886e-5 months <br />) | |
| Opened: | Tim Holland 03:49 Feb 20, 2010 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Feb 20, 2010 |
| 45715 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 570432024-03-22T01:56:00022 March 2024 01:56:00
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