ENS 53227
ENS Event | |
|---|---|
06:06 Feb 18, 2018 | |
| Title | |
| Event Description | On February 18, 2018, Grand Gulf Nuclear Station experienced the concurrent inoperability of two Emergency Diesel Generators [DG]. This event is being reported as a late 8-hour non-emergency notification per 10 CFR 50.72(b)(3)(v)(D) as an 'Event or Condition that Could Have Prevented Fulfillment of a Safety Function (Accident Mitigation).'
On February 14, 2018 at 0100 [CST], the Division 2 Diesel Generator was declared inoperable, and subsequently removed from service for maintenance. On February 18, 2018 at 0006 [CST], the Division 3 Diesel Generator Jacket Water temperature exceeded the trip setpoint and Division 3 Diesel Generator was declared inoperable. The Division 2 Diesel Generator was restored and declared operable on February 18, 2018 at 0355 [CST], and the Division 3 Diesel Generator was restored and declared operable on February 18, 2018 at 1240 [CST]. As a result, Technical Specification Condition 3.8.1.E was entered at 0006 [CST] on February 18, 2018 and exited at 0355 [CST] on February 18, 2018. Technical Specification Bases 3.8.1.E.1 states 'With two DGs inoperable, there is one remaining standby AC source. Thus, with an assumed loss of offsite electrical power, insufficient standby AC sources are available to power the minimum required ESF functions.' Offsite power was available throughout this event and there was no impact to the health and safety of the public or plant personnel. The NRC Resident Inspector 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:+131.97 h5.499 days <br />0.786 weeks <br />0.181 months <br />) | |
| Opened: | Jay Comfort 18:04 Feb 23, 2018 |
| NRC Officer: | Steven Vitto |
| Last Updated: | Feb 23, 2018 |
| 53227 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (97 %) |
| After | Power Operation (97 %) |