[en] In FY 1993 (April 1993 to March 1994), the JMTR was operated from the 106th cycle to the former half of the 109th cycle, and the JMTR was fully converted to the LEU fuels in the 108th cycle. Various capsules and rabbits were irradiated for nuclear fuels and materials research and for radioisotope production, and the related PIEs were carried out. R and D works on irradiation technology and PIE technology have been extensively continued as follows:Capsules have been developed for fusion materials irradiation experiments and fundamental research ; Re-instrumentation technique, remote control crack propagation testing machine, examination technique with miniaturized specimens and underwater cutting machine for high radioactive components have been developed;Irradiation tests on blanket materials has been intensively carried out. (author)