Criticality safety evaluation of multiple units in Tokai Reprocessing Plant

As a part of the safety confirmation work of Tokai Reprocessing Plant, an assessment of the basic data for criticality safety and shielding design has already been reported. In that report, two plutonium solution storage cells were evaluated to be safe enough from a viewpoint of multiple unit criticality safety. In this report, an additional evaluation of multiple unit criticality safety was made for the main plant and the UO3 storage which were designed in 1960's and constructed in 1970's. The evaluated cells and rooms are the enriched uranium dissolution cell, the adjustment and feeding cell, two second extraction cycle cells, the third uranium cycle cell, the uranium concentration and denitration rooms, the third plutonium cycle cell, the plutonium concentration cell, two plutonium solution storage cells, the rework cell, and the UO3 storage room. As a result, it was confirmed that these cells and rooms were safe enough from a viewpoint of multiple unit criticality safety. (author)