Jōyō, Nuclear research reactor in Oarai, Japan
The Jōyō is a research reactor in Oarai that uses liquid sodium as a coolant and operates at 140 megawatts of thermal power. The facility conducts materials testing and fuel research to improve the performance of nuclear reactor systems.
The reactor began operations in 1977 and later underwent three major core redesigns to enhance its research capabilities. These upgrades from MK-I through MK-III represented important steps in improving the facility's performance.
The facility's name comes from an old designation for the Ibaraki region, connecting modern science with local heritage. This naming choice shows how places honor their past while moving forward technologically.
The reactor operates under strict oversight from the Japan Atomic Energy Agency, with all work following rigorous safety protocols. Access to this research facility is limited, and visitors must follow required safety procedures.
The reactor generates exceptionally high neutron flux rates needed for specialized research on new nuclear fuels. This capability makes it an important tool for scientists developing improved fuel designs.
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