Decommissioning plan of JRR-4

Ishikuro, Yasuhiro ; Hirane, Nobuhiko; Kato, Tomoaki

Japan Research Reactor No.4 (JRR-4) is a swimming pool type reactor moderated and cooled with light-water. The maximum thermal power of JRR-4 is 3,500 kW. Since its initial criticality in January 1965, JRR-4 had been operated about 45 years until in December 2010. Subsequently, the Great East Japan Earthquake occurred on March 11, 2011. Although JRR-4 was no severe damage, we have determined to decommission JRR-4 in consideration of various things, and will submit the decommissioning plan of JRR-4 to the nuclear regulatory body in the near future.