ENS 57279
ENS Event | |
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01:10 Aug 21, 2024 | |
Title | Control Room Filtration Systems Inoperable |
Event Description | The following information was provided by the licensee via fax or email:
At 2010 CDT on 08/20/2024, with Unit 2 in Mode 1 at 100% power, Train B Essential Chiller was unable to maintain the Chilled Water Outlet Temperature in the required band. Train B Essential Chilled Water and the associated cooled components were declared inoperable. Train B Control Room Makeup and Cleanup Filtration System was declared inoperable due to the unavailability of cooling. Train C Control Room Makeup and Cleanup Filtration System was previously inoperable for planned maintenance for reasons other than loss of cooling. This resulted in the inoperability of two of the three 50-percent capacity safety trains required for accident mitigation. This event is reportable under 10 CFR 50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: Train C has been placed back in service and is awaiting testing to verify its ability to perform its safety function. Testing is expected to be completed by 1500 CDT on 08/21/2024. Plant is on a 72 hr S/D clock until restoration is verified. |
Where | |
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South Texas Texas (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000499/LER-2024-002 Two Control Room Envelope HVAC Trains Inoperable Resulting in a Condition That Could Have Prevented Fulfillment of a Safety Function |
Time - Person (Reporting Time:+0.4 h0.0167 days <br />0.00238 weeks <br />5.4792e-4 months <br />) | |
Opened: | Chris Van Fleet 01:34 Aug 21, 2024 |
NRC Officer: | Jordan Wingate |
Last Updated: | Aug 21, 2024 |
57279 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |