ENS 57982: Difference between revisions
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| emergency class = Non Emergency | | emergency class = Non Emergency | ||
| notification date = 10/13/2025 00:52 | | notification date = 10/13/2025 00:52 | ||
| retracted = Yes | |||
| notification by = Justin Gerg | | notification by = Justin Gerg | ||
| NRC officer = Ernest West | | NRC officer = Ernest West | ||
| event date = 10/12/2025 17:05 PDT | | event date = 10/12/2025 17:05 PDT | ||
| last update date = | | last update date = 11/05/2025 | ||
| title = Loss of Safety Function | | title = Loss of Safety Function | ||
| event text = The following information was provided by the licensee via phone and email: | | event text = The following information was provided by the licensee via phone and email: | ||
| Line 26: | Line 27: | ||
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: | 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. | At the time of notification, the licensee had exited all technical specification action statements. | ||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/ | * * * RETRACTION ON 11/5/2025 AT 1925 EST FROM JERRY AINSWORTH TO ERNEST WEST * * * | ||
On October 12, 2025, at 2152 PDT, Columbia Generating Station notified the NRC pursuant to 10 CFR 50. 72(b)(3)(v)(C) and (D) due to the loss of safety function of both trains of standby gas treatment (SGT) and secondary containment for approximately 2 hours under Event Notification 57982. | |||
The notification was made due to the failure of two dampers to close during testing of the Reactor Building Emergency Cooling System. The dampers that failed to close were cross-divisional and affected rooms with equipment necessary for both trains of the SGT system which supports the safety function of secondary containment. | |||
Following the event, engineering conducted an evaluation to determine if both air dampers remaining open during a loss of cooling accident would have put any safety-related equipment at risk due to potential changes in radiological and environmental conditions within the associated motor control center (MCC) rooms. | |||
The engineering evaluation determined temperatures and humidities would not have exceeded limits in the MCC rooms due to the dampers being left open. Additionally, any increase in radiation would be considered negligible and would not affect the ability of the equipment to perform their design functions. Therefore, the safety-related equipment within the MCC rooms would have been available and operable to perform their design function were an accident to occur. Consequently, the failure of two dampers to close during testing is not considered to be an event or condition that could have prevented fulfillment of the safety function of SGT and secondary containment and did not impact the ability to mitigate the consequences of an accident or control the release of radioactive material, therefore, event notification 57982 is retracted. | |||
The Resident Inspector has been notified. | |||
Notified R4DO (Vossmar) | |||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20251106en.html#en57982 | |||
}}{{unit info | }}{{unit info | ||
| Unit = 2 | | Unit = 2 | ||
Latest revision as of 07:20, 6 November 2025
| 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: | Nov 5, 2025 |
| 57982 - NRC Website
| |
Columbia with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |