Method of dismantling and withdrawing equipment containing radioactive oil waste

In a case of dismantling and withdrawing an equipment containing radioactive oil wastes, not dischargeably, at the inside thereof, the equipment is dismantled into each of constituent components and, after the removal of radioactive oil wastes, arranged or discarded. The procedures not only have a risk of prevailing radioactive contaminations but also make the operation time lower in a radiation administration region. In view of the above, upon dismantling and withdrawing an equipment containing radioactive oil wastes and solvent wastes, an oil coagulant comprising polynorbornane is charged into the equipment to solidify the oil wastes and solvent wastes in the equipment and then the equipment is dismantled and withdrawn. This can prevent the radioactive oil wastes that are difficult to be discharged from leaking out of the dismantled and equipment to result in the scattering of radioactive contamination and can shorten the operation time and reduce the exposure dose. (T.M.)