ENS 53115
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ENS Event | |
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15:18 Dec 12, 2017 | |
Title | Automatic Start Of Edg Due To Loss Of Esf Transformer |
Event Description | At approximately 0918 CST on Tuesday, December 12, 2017, the Grand Gulf Nuclear Station experienced a loss of the Engineered Safety Features (ESF) Transformer 11 which was powering the Division 1 ESF bus. Subsequently, the station experienced an automatic start of the Division 1 Emergency Diesel Generator [EDG], partial isolation of the primary and secondary containment buildings and the isolation of the Reactor Core Isolation Cooling System [RCIC].
It is not currently understood why the RCIC system isolated during this event. A team is investigating this issue separately from the loss of the ESF 11 transformer. The cause of the event is under investigation at this time. No other issues or unexpected events occurred. The NRC Resident Inspector has been notified of the event. |
Where | |
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Grand Gulf ![]() Mississippi (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
Time - Person (Reporting Time:+2.37 h0.0988 days <br />0.0141 weeks <br />0.00325 months <br />) | |
Opened: | Ryan Meyer 17:40 Dec 12, 2017 |
NRC Officer: | Steven Vitto |
Last Updated: | Dec 12, 2017 |
53115 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (16 %) |
After | Power Operation (16 %) |
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