ENS 57982: Difference between revisions
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ENS Event | |
|---|---|
00:05 Oct 13, 2025 | |
| Title | Loss of Safety Function |
| Event Description | The following information was provided by the licensee via phone and email:
On October 12, 2025, Columbia Generating Station (CGS) was performing a reactor building emergency cooling test. At 1428 [PDT], an air damper associated with the division 1 motor control center (MCC) room cooling failed to perform its intended function to close. This MCC supports the operation of one subsystem of the standby gas treatment system (SGT). At 1440, a second air damper, associated with the division 2 MCC room cooling, also failed. This MCC supports the operation of the other SGT subsystem. Field operators were dispatched to investigate the potential cause. At 1627, the first air damper that had failed was observed to have closed on its own without further operator action. Operators subsequently determined that failure of the air damper to close rendered the associated emergency room coolers inoperable. At 1705, [the division 2 MCC] was declared inoperable and technical specification action statement 3.8.7.A was entered. From 1440 to 1627, CGS was in a condition that required both SGT subsystems to be declared inoperable due to the loss of emergency room cooling to their associated MCCs. This condition constitutes a loss of safety function of SGT and secondary containment. It could have challenged the station's ability to control a radioactive release had one occurred during that time. This notification is being made pursuant to 10 CFR 50.72(b)(3)(v)(C) and (D) due to the loss of safety function of both trains of SGT and secondary containment for approximately 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. The Resident Inspector was notified. The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: At the time of notification, the licensee had exited all technical specification action statements. |
| Where | |
|---|---|
Columbia  Washington (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+0.78 h0.0325 days <br />0.00464 weeks <br />0.00107 months <br />) | |
| Opened: | Justin Gerg 00:52 Oct 13, 2025 |
| NRC Officer: | Ernest West |
| Last Updated: | Oct 13, 2025 |
| 57982 - NRC Website
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