ENS 58142
ENS Event | |
|---|---|
02:09 Feb 2, 2026 | |
| Title | HIGH-PRESSURE Core Spray Inoperable |
| Event Description | The following information was provided by the licensee via phone and email:
At 2009 CST on February 1, 2026, Grand Gulf Nuclear Sation (GGNS) was conducting surveillance testing on the high-pressure core spray (HPCS) division III diesel generator. Following the start of the HPCS division III diesel generator, the HPCS standby service water (SSW) pump immediately tripped. As a result, HPCS SSW and HPCS were declared inoperable. The cause of the HPCS SSW pump trip is being investigated. 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. HPCS, a single-train safety 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 (RCIC) was verified to be operable per GGNS technical specification 3.5.1.B.1. The NRC 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:+-2.48 h-0.103 days <br />-0.0148 weeks <br />-0.0034 months <br />) | |
| Opened: | Mike Riehl 23:40 Feb 1, 2026 |
| NRC Officer: | Robert A. Thompson |
| Last Updated: | Feb 1, 2026 |
| 58142 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (97 %) |
| After | Power Operation (97 %) |