METHOD FOR MEASURING VOLUME OF AIR GAP IN RADIOACTIVE SOLID WASTE CONTAINER AND METHOD FOR FIXING RADIOACTIVE SOLID WASTE

摘要

PURPOSE:To prevent the generation of the excess or shortage of the solidifying material to be injected into the air gaps in drum cans by measuring the pressures and temps. in the drum cans and an auxiliary container of a known volume, making prescribed computation, and thereby quantitatively measuring the air gap quantity before and after the injection of the solidifying material. CONSTITUTION:The drum can 4 contg. radioactive waste 3 is first placed on a weight meter 1 and the weight thereof is measured and is stored in an arithmetic circuit. The drum can 4 is then imposed on a base 2 in the position for injecting concrete mortar. A cap 12 is set on this drum. An air pipe 23, a thermometer 7, a vacuum gage 8, and a concrete mortar injecting pipe 13 are fixed thereto. The air pipe 23 is connected via a valve 20 to the auxiliary container 17 of the known volume. The pressure P1 and temp. T1 of the air gap 30 existing in the drum can 4 are measured and the pressure P2 and temp. T2 in the auxiliary container 17 having the pressure different from the pressure in the air gap 30 are measured. The air gap 30 and the auxiliary container 17 are then connected and thereafter, the pressure P3 and temp. T3 are measured. The volume of the air gap 30 is determined by computation in accordance with prescribed equation.