Radiation environment account before dismantling the conversion facilities; Evaluation of the uranium inventory and air dose rate in the dismantling facilities

Shimaike, Masamitsu; Yokoyama, Kaoru; Ikegami, Sohei; Takahashi, Nobuo; Sugitsue, Noritake

At the conversion facility, 48Y homogenization treatment equipment (cylinder processing room), UO pneumatic dispatch equipment (fluoride precipitation process room), gas trapping and filling equipment (cold trap room and UF filling room) and the second grade UF drying equipment (UF feed chamber and UF treatment room) are scheduled to be dismantled, in 2008 fiscal year. The -ray measurement intended for the equipment was done before dismantlement and the radioactivity inventory was evaluated. As a result, the part that the uranium recovery had to be executed was forecast for reasonable dismantlement. Additionally, the reprocessed uranium was used at the conversion facility, so the feature nuclide affecting the air dose was evaluated. In addition, -ray analysis results are organized for using as the waste data and the radionuclide distribution data in the process.