ENS 58068: Difference between revisions
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At 0913 CDT, on October 6, 2025, a partial actuation of the division 1 emergency diesel generator (DG1) occurred during the performance of the 4160-volt bus 1F undervoltage relay channel functional test. The DG1 automatic start in the emergency mode was the result of the inadvertent contact between a jumper and another component. However, due to the test configuration, the output breaker for DG 1 did not close and pick up the load of the 4160-volt bus 1F since no actual undervoltage condition was present. DG1 components functioned as expected in response. Following the actuation, DG1 was restored to a standby lineup in accordance with plant procedures. | At 0913 CDT, on October 6, 2025, a partial actuation of the division 1 emergency diesel generator (DG1) occurred during the performance of the 4160-volt bus 1F undervoltage relay channel functional test. The DG1 automatic start in the emergency mode was the result of the inadvertent contact between a jumper and another component. However, due to the test configuration, the output breaker for DG 1 did not close and pick up the load of the 4160-volt bus 1F since no actual undervoltage condition was present. DG1 components functioned as expected in response. Following the actuation, DG1 was restored to a standby lineup in accordance with plant procedures. | ||
This event is considered an invalid system actuation reportable under 10 CFR 50.73(a)(2)(iv)(A). The actuation was not initiated in response to actual plant conditions or parameters and was not a manual initiation. Therefore, in accordance with 10 CFR 50.73(a)(1), this telephone notification is provided within 60 days after discovery of the event instead of submitting a written licensee event report. The NRC Resident lnspector has been notified. | This event is considered an invalid system actuation reportable under 10 CFR 50.73(a)(2)(iv)(A). The actuation was not initiated in response to actual plant conditions or parameters and was not a manual initiation. Therefore, in accordance with 10 CFR 50.73(a)(1), this telephone notification is provided within 60 days after discovery of the event instead of submitting a written licensee event report. The NRC Resident lnspector has been notified. | ||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/ | | URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20251204en.html#en58068 | ||
}}{{unit info | }}{{unit info | ||
| Unit = 1 | | Unit = 1 | ||
Latest revision as of 07:20, 4 December 2025
| Where | |
|---|---|
Cooper  Nebraska (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1368.7 h57.029 days <br />8.147 weeks <br />1.875 months <br />) | |
| Opened: | Brian Stander 16:55 Dec 2, 2025 |
| NRC Officer: | Kerby Scales |
| Last Updated: | Dec 2, 2025 |
| 58068 - NRC Website
| |