• Kansai Electric Power shut Mihama nuclear plant Unit 3 reactor on Sept. 17 during power-up from its 29th refueling outage.
• Water dripping was detected near an air vent valve on outlet piping tied to the No. 6A high-pressure feedwater heater drain system.
• Section could not be isolated, prompting a manual shutdown to inspect equipment despite no immediate operational impact.
• Decision made at 5:45 p.m.; load reduction started at 8:30 p.m. on Sept. 17.
• No radiological impact reported on the surrounding environment.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. KEPCO - Kansai Electric Power Co. Inc. published the original content used to generate this news brief on September 18, 2026, and is solely responsible for the information contained therein.