Kansai Electric Power Revises Nuclear Emergency Disaster Prevention Business Plans for Three Nuclear Power Plants

Kansai Electric Power Co., Inc. announced on August 27 that it has revised the nuclear operator disaster prevention business plans for the Mihama, Takahama, and Oi nuclear power plants in accordance with Japan's Act on Special Measures Concerning Nuclear Emergency Preparedness, and filed them with the Prime Minister and the Nuclear Regulation Authority on the same day.

The revisions pertain to nuclear emergency disaster prevention arrangements at the three nuclear power plants. Kansai Electric Power stated that it will continue to ensure the safety of the nuclear power plants and enhance nuclear emergency disaster prevention measures in accordance with the relevant plans.

According to the documents, the consultation period prior to the revisions was from May 13 to July 30, 2026, totaling 79 days. The consultation parties included the local governments where the nuclear power plants are located and related neighboring local governments. Specifically, the Mihama Nuclear Power Plant involves Fukui Prefecture, Mihama Town, as well as Shiga Prefecture, Gifu Prefecture, and Kyoto Prefecture; the Takahama Nuclear Power Plant involves Fukui Prefecture, Takahama Town, as well as Shiga Prefecture and Kyoto Prefecture; and the Oi Nuclear Power Plant involves Fukui Prefecture, Oi Town, as well as Shiga Prefecture.

In this revision, Chapter 1 "General Provisions" of the plans remained unchanged; Chapter 2 "Implementation of Nuclear Disaster Prevention Measures" primarily involved standardization adjustments to the main text, notification and reporting formats, and the content of application forms; Chapters 3 "Implementation of Emergency Response Measures for Nuclear Emergencies," 4 "Implementation of Post-Nuclear Disaster Measures," and 5 "Miscellaneous" primarily involved standardization adjustments to quantities related to the borrowing of equipment and materials.

The Act on Special Measures Concerning Nuclear Emergency Preparedness requires nuclear facility operators to formulate disaster prevention business plans, review them annually, and revise them as necessary. Prior to revision, operators are required to consult with the governors of the prefectures and mayors of the municipalities where the facilities are located, as well as the governors of related neighboring prefectures. Disaster prevention business plans typically cover matters related to nuclear emergency response, including rapid notification, prevention of disaster escalation, and environmental radiation monitoring.