ENS 52812
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ENS Event | |
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20:35 Jun 16, 2017 | |
Title | Loss of Safety Function Due to Keowee Dam Units Being Declared Inoperable |
Event Description | Keowee Hydro Units [KHU] 1 and 2 were both declared inoperable at 1635 [EDT] on 6-16-17 due to discovery of breaker 1GSC-1 (KHU-1) in the intermediate position, and breaker 2GSC-1 (KHU-2) in the open position. Keowee Hydro Units are required to be operable per TS [Technical Specification] 3.8.1 (AC Sources - Operating), TS 3.8.2 (AC Sources - Shutdown), and TS 3.7.10 (Protected Service Water, applies only to KHU aligned to the Overhead Power Path). All Tech Spec required conditions were entered, and all required actions completed. Both Standby Buses were energized from a Lee Combustion Turbine via an isolated power path at 1715 [EDT] on 6-16-17 in accordance with TS 3.8.1 Condition (I), Required Action (I.1).
It has been determined by station personnel that a loss of safety function did occur between 1635 [EDT] (when the Keowee Hydro Units were declared inoperable) and 1715 [EDT] (when the Standby Buses were energized from a Lee Combustion Turbine via an isolated power path). Investigation has determined the cause of breakers 1GSC-1 and 2GSC-1 being out of their required closed position to be inadvertent bumping while performing station work activities. Breakers 1GSC-1 and 2GSC-1 have been reclosed, and both Keowee Hydro Units have been declared operable as of 2351 [EDT] on 6-16-17. The licensee notified the NRC Resident Inspector. |
Where | |
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Oconee ![]() South Carolina (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000269/LER-2017-001 |
Time - Person (Reporting Time:+3.95 h0.165 days <br />0.0235 weeks <br />0.00541 months <br />) | |
Opened: | Jeremy Galloway 00:32 Jun 17, 2017 |
NRC Officer: | Bethany Cecere |
Last Updated: | Jun 17, 2017 |
52812 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 3 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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