ENS 45044
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ENS Event | |
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04:27 May 6, 2009 | |
Title | Valid Auto-Start and Loading of Emergency Diesel Generator to Safety Bus Due to Undervoltage Condition |
Event Description | A valid Engineering Safety Feature (ESF) actuation for emergency A/C power for the 15AA bus occurred at 2327 on 5/5/09 due to degraded voltage on ESF Transformer 12. ESF Transformer 12 was supplying power to the 15M bus due to Service Transformer 21 being out of service for maintenance. A fault occurred on the site power loop at switch 389-2901S causing breaker J3872 and breaker 5X01 to open de-energizing the site power loop and degrading the offsite power circuit 115kv voltage to the point that Division 1 Load Shedding and Sequencing (LSS) sensed a degraded voltage condition and performed a Load Shedding and Sequencing on the 15AA bus and started Division 1 Emergency Diesel Generator to power the 15AA bus. Division 1 Diesel Generator is now supplying power to the 15M bus. Operators implemented appropriate off normal event procedures to mitigate the transient. All systems responded as designed.
The exact cause of the fault to switch 2109S is not known at this time. The licensee 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:+1.92 h0.08 days <br />0.0114 weeks <br />0.00263 months <br />) | |
Opened: | Mike Larson 06:22 May 6, 2009 |
NRC Officer: | Pete Snyder |
Last Updated: | May 6, 2009 |
45044 - NRC Website
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Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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