JMTR focus on the activation method. By carrying out the preliminary tests using irradiation facilities existing, and verification tests using the irradiation facility that has developed in the cutting-edge research and development strategic strengthening business, as irradiation tests towards the production of $^{99}$Mo, we have been conducting research and development that can contribute to supply about 25\% for $^{99}$Mo demand in Japan and the stable supply of radiopharmaceutical. This report describes a summary of the status of the preliminary tests for the production of $^{99}$Mo: Maintenance of test equipment in the facility in JMTR Hot Laboratory in preparation for research and development for the production of $^{99}$Mo in JMTR and using MoO$_{3}$ pellet irradiated at Kyoto University Research Reactor Institute (KUR).