PURPOSE: To prevent volume expansion and maintain the healthiness of a solidified body for a long period by adding NaCl, NaOH or NaNO3 to prevent when a radioactive waste liquid containing Na2SO4 is solidified.
CONSTITUTION: Cement is filled into a kneading tank 7 from a solidifying tank 1, and water is added from an additive water tank 2 for kneading 7. CaCl, NaOH or NaNO3 is filled into the tank 7 from a tank 3 to be mixed with cement, and mixed cement is poured into a drum 9 filled with pellets 8 in advance from the tank 7 to form a solidified body. The Na2SO4 in the pellets 8 is prevented from becoming brine by the NaCl, NaOH or NaNO3 in the mixed cement, thus the cement solidified body is prevented from generating cracks and being deteriorated by volume expansion.
FUNABASHI KIYOMI
CHINO KOICHI
