Modification and utilization of JRR-2

Japan Research Reactor No.2 (JRR-2) is a heavy water moderated and cooled reactor with MTR-type and cylindrical type 93 % enriched uranium fuel elements. It provides a maximum thermal neutron flux of about 2 x 1014 n/cm2 · sec at the power level of 10 MW. The reactor reached to its initial criticality in October 1960, and since that time it has been used for various research and development work satisfactorily, except for about two years shutdown for repair and maintenance. In accordance with the non-proliferation policy of the United States, the core of JRR-2 will be converted to 45 % enriched uranium in 1987. (author)