The following information was provided by the licensee via phone and email:
At 1621 EDT on 8/12/2025, a technical specification required shutdown was initiated at Davis-Besse Nuclear Power Station Unit 1. Technical specification limiting condition for operation 3.3.11 for steam generator (SG) low level instrumentation channel requirements was not met, and condition 'B' was entered on 8/12/2025 at 1600 with required actions to be in mode 3 with a completion time of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and be in mode 4 with a completion time of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. This event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(i). 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:
The affected
SG level instrumentation is for emergency
feedwater automatic initiation. The instruments were declared
inoperable due to a reference leg leak in containment.
