ENS 57338
ENS Event | |
|---|---|
03:04 Sep 25, 2024 | |
| Title | |
| Event Description | The following information was provided by the licensee via phone or email:
On September 24, 2024, at 2204 CDT, Grand Gulf Nuclear Station (GGNS) was conducting surveillance testing on the high pressure core spray (HPCS) division III diesel generator. During testing, the HPCS pump breaker unexpectedly tripped after the HPCS diesel generator started and powered the safety bus. The breaker performed its motor protection function and tripped due to an over-frequency indication. The event is being reported in accordance with 10 CFR 50.72(b)(3)(v)(D) as an event or condition which could have prevented the fulfillment of a safety function. Troubleshooting is in progress. HPCS, a single-train system, will remain inoperable until the condition is corrected. All sources of offsite power are available. No other safety systems are inoperable. Reactor core isolation cooling was verified to be operable per GGNS Technical Specification 3.5.1.B.1. The NRC Senior Resident has been notified. |
| Where | |
|---|---|
| Grand Gulf Mississippi (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:+-0.97 h-0.0404 days <br />-0.00577 weeks <br />-0.00133 months <br />) | |
| Opened: | Joshua Hubbard 02:06 Sep 25, 2024 |
| NRC Officer: | Bill Nytko |
| Last Updated: | Sep 25, 2024 |
| 57338 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |