ENS 53399
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ENS Event | |
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04:27 May 12, 2018 | |
Title | Inadvertent Actuation of the Emergency Diesel Generator |
Event Description | On 5/11/2018, at 2327 hours0.0269 days <br />0.646 hours <br />0.00385 weeks <br />8.854235e-4 months <br /> CDT, with the plant in Mode 5, Grand Gulf Nuclear Station was making preparations for surveillance test 06-OP-1P75-R-0003, Standby Diesel Generator 1 Functional Test. The Grand Gulf Nuclear Station experienced an auto-start of the Division 1 [Emergency] Diesel Generator [EDG] when the 15AA Bus Potential Transformer (PT) fuse drawer was racked out instead of the line PT fuse drawer for Bus 15AA feeder breaker 152-1514. This resulted in the 15AA Incoming Feeder Breaker 152-1511 from Engineered Safety Features Transformer 12 opening, de-energizing the 15AA Bus. The Division 1 EDG started and energized Bus 15AA. The Division 1 LSS SYSTEM FAIL annunciator was received and Standby Service Water A failed to start due to the 15AA Bus PT fuse drawer being racked out. Standby Gas Treatment Train B was manually initiated per the Loss Of AC Power Off Normal Emergency Procedure. Station equipment operated as expected based on the PT fuse drawer that was racked out.
The Division 1 EDG was manually tripped from the Control Room because cooling from the Standby Service Water A was not available. RHR [residual heat removal] B was in Shutdown Cooling [mode] and was verified not affected The licensee has notified the NRC Resident Inspector. |
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:+2.52 h0.105 days <br />0.015 weeks <br />0.00345 months <br />) | |
Opened: | Wesley Marshall 06:58 May 12, 2018 |
NRC Officer: | Ossy Font |
Last Updated: | May 12, 2018 |
53399 - NRC Website
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