ENS 57126
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ENS Event | |
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13:17 May 13, 2024 | |
Title | Inoperability of Both Trains of Unit 2 Low Head Safety Injection |
Event Description | The following information was provided by the licensee via phone and email:
At 0917 EDT on May 13, 2024, a control room operator erroneously rendered the `B train of the Unit 2 residual heat removal (RHR) system inoperable. This occurred while the `A train of the Unit 2 RHR system was out of service for preplanned maintenance. RHR serves as the low head safety injection (LHSI) subsystem for the emergency core cooling system (ECCS) and because of this, Unit 2 was without a required train of ECCS from 0917 EDT to 0921 EDT. No other equipment issues were identified. The LHSI subsystem is credited by the analysis for a large break loss of coolant accident at full power. This event is being reported pursuant to 10 CFR 50.72(b)(3)(v)(D). The NRC resident inspector has been notified. There is no release of radioactive material associated with this event. |
Where | |
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Watts Bar Tennessee (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000391/LER-2024-003 Inoperability of Both Trains of Unit 2 Low Head Safety Injection |
Time - Person (Reporting Time:+3.38 h0.141 days <br />0.0201 weeks <br />0.00463 months <br />) | |
Opened: | Paul Blakely 16:40 May 13, 2024 |
NRC Officer: | Thomas Herrity |
Last Updated: | May 13, 2024 |
57126 - NRC Website
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Unit 2 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
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