ENS 57146
ENS Event | |
|---|---|
12:20 May 26, 2024 | |
| Title | Two of Three Essential Chilled Water Trains Declared Inoperable |
| Event Description | The following information was provided by the licensee by phone and email:
At 0210 CDT 5/24/24, essential chiller A train and cascading equipment was declared inoperable for maintenance to correct a temperature control malfunction. At 0720 CDT 5/26/24, essential cooling water B train and cascading equipment (including B train essential chiller) was declared inoperable due to a through wall leak discovered on the essential cooling water return header temperature element thermal well. This condition resulted in an inoperable condition on two out of three safety trains for the accident mitigating function, including the train A and train B high head safety injection, low head safety injection, containment spray, electrical auxiliary building heating ventilation and air conditioning (HVAC), and essential chilled water. All C train safety related equipment remains operable. This was determined to be reportable within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> as required by 10CFR50.72(b)(3)(v)(D). NRC Resident Inspector has been notified. |
| Where | |
|---|---|
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 | |
| Time - Person (Reporting Time:+1.53 h0.0638 days <br />0.00911 weeks <br />0.0021 months <br />) | |
| Opened: | Randall Maus 13:52 May 26, 2024 |
| NRC Officer: | Natalie Starfish |
| Last Updated: | May 26, 2024 |
| 57146 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |