Radioactive waste processing method

A sealed vessel containing radioactive wastes is contained in an other sealed vessel in which powdery raw material for glass is filled surrounding the circumference of the former, and the sealed vessel is pressed by a high temperature isotropic pressing device. Alternatively, after heating a sealed vessel containing a mixture of radioactive liquid wastes and a powdery raw material for glass to calcine the radioactive liquid wastes, it is pressed by a high temperature isotropic pressing device. With such procedures, the powdery raw material for glass or powdery starting material for glass in the mixture are softened to a high viscous state, and cooled and solidified by taking the sealed vessel out of the high temperature isotropic pressing device, to form a stable glass solidification product. Accordingly, radioactive wastes can be kept stably for a long period of time, and since a furnace is not necessary, troubles of surrounding contamination caused by using a furnace can be avoided. (T.M.)