LOCATION@1 's worst nuclear radiation accident took place at a uranium reprocessing facility in MISC@1 , LOCATION@2 prefecture , northeast of LOCATION@3 , LOCATION@1 , on NUMBER@1 September , NUMBER@2 .

LOCATION@1 's worst nuclear radiation accident took place at a uranium reprocessing facility in LOCATION@4 , northeast of LOCATION@3 , LOCATION@1 , on NUMBER@1 September , NUMBER@2 .
