New cooling system for boiling water reactors



Japan’s nuclear watchdog decided recently to require operators of boiling water reactors to install new emergency cooling systems which would activate in the event of a serious accident. The Nuclear Regulation Authority approved the revision of safety regulations to make mandatory the installation of cooling systems to circulate water inside reactor containers. Such systems are designed to prevent temperature rises that could damage containers. Boiling water reactors are housed in containers that are smaller than those for pressurised water reactors, making it easier for internal temperatures and pressure to rise when conventional cooling systems are damaged. Due to the rule change, emergency cooling systems will need to be installed for a number of boiling water reactors that have been undergoing checks in preparation to resume operations.

Contact Japan Nuclear Regulations, qainfo@nsr.go.jp

 

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