Abstract: A method for chopping a body consisting of explosives is described, by which a high-pressure water jet emerging from a nozzle is directed against the body of solid explosive and in which the nozzle and the body carry out a movement relative to each other during the chopping. Preferred fields of use are composite rocket fuels. There is also described a device for carrying out the process, in which the body of composite rocket fuel to be decomposed or divided into portions is secured on a chopping bench, and a nozzle fastened to a nozzle holder for the high-pressure water jet as well as at least one means for producing a relative movement serving as chopping advance movement between the nozzle and the body of composite rocket fuel are provided.

Abstract: A nuclear reactor installation includes a core catching apparatus for containing the components of a nuclear reactor core during a core melt-down accident which comprises a container provided with means for preventing the mixing of the metallic portion of the core melt with water thereby to avoid formation of explosive gases and spreading of radioactive compounds by an explosion following such core-melt-down-accident.