The following information was provided by the licensee via phone or email:
On January 28, 2025 at 0832 EST, a technical specification (TS) required shutdown was initiated at Catawba Unit 1. TS action 3.4.13, condition 'B', was entered on January 28, 2025 at 0430 when operators detected a 1.4 gpm unidentified reactor coolant system leak. TS action 3.4.13, condition 'B' has a 'required action' to reduce leakage to within limits within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. This 'required action' was not completed within the completion time; therefore, a TS required shutdown was initiated per TS 3.4.13 condition 'C'.
This event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(i) for `the initiation of any nuclear plant shutdown required by the plant's technical specifications.'
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:
Based on elevated temperature readings on the pressurizer cavity in their lower containment, the licensee anticipates that the leak is in that location. The investigation is ongoing and they will ascertain more information when they reach Mode 3 and enter containment.
In addition, all safety systems are
operable for Unit 1. Unit 2 was unaffected.
