this is exactly the technology that scientists from tomsk polytechnic university offer. we clean the surface. in order for the remaining block to be used somewhere in industry, the removed layer, which is heavily contaminated, can be buried. all this is done in order to reduce the volume of buried material. according to scientists, it is enough to remove only 1.5-2 cm of the top layer to reuse a clean concrete block , while the costs become lower, than with the already familiar methods of decommissioning nuclear power plants. in general, the layer can be removed mechanically. and this is being done now, problems with tool wear, and the same thing as you said, you can completely bury everything, which is what we actually did here in seversk, for example, the advantage of the new technology is obvious - the absence of radioactive dust, the environmental cleanliness of the process, comparatively low energy consumption. the development will be in demand at nuclear industry enterprises for the decommissioning of nuclear and radiation hazardous facilities, both in russia, and