Planned Reactor Start-up and Commencement of Adjustment Operation for Mihama Unit 3 (Water Dripping from Around the Air Vent Valve at the Outlet Pipe of the 6A High-Pressure Feedwater Heater Continuous Level Control Valve)

Business Operations Update

The Kansai Electric Power Company, Incorporated announced the planned reactor start-up and commencement of adjustment operation for Mihama Unit 3. As a result of the cause investigation, a penetration hole caused by incompatible mounting between insulation material and the exterior plate was identified, and a measure to clarify the mounting direction of the exterior plate will be implemented. Reactor start-up is scheduled for October 10, 2026, and the start of adjustment operation is also planned for the same day, with full commercial operation targeted for November 4, 2026.

Schedule and Impact

Start-up and reaching criticality are scheduled for October 10, and completion of the comprehensive load performance test is scheduled for November 4. The implemented measure aims to improve the reliability of the feedwater system and is expected to contribute to the safety and stable operation of the equipment. Specific financial impacts have not been disclosed, but the resumption of operations and recovery of generation capacity will contribute to business operations.