A criticality accident with limited off site release of both radiation (gamma and neutron) and a very small release of radioactivity occurred at Tokaimura in 1999 during the production of enriched uranium fuel.
Kritična nesreća s ograničenim vanjskim otpuštanjem obje radijacije (gama i neutron) i s malim otpuštanjem radioaktivnosti dogodila se u Tokaimuri u 1999.g. tokom proizvodnje obogačenog uranijskog goriva.