Patent Number: 042833671
Section: claims

1. A system for removing xenon and krypton from a gas mixture which includes an inert carrier gas comprising: first, nitrogen cooled container means in a first freezing stage for first cooling the gas mixture to the temperature of boiling nitrogen to separate solid xenon from the gas mixture, compressor means to increase the pressure of the gas mixture after separation of xenon, and nitrogen cooled separator means in a second freezing stage to separate solid krypton from the gas mixture after pressure increase by said compressor means, so that the xenon and krypton are solidified sequentially for separate collection. 2. A gas-separating plant for removing xenon and krypton from irradiated nuclear fuel particles; said plant comprising: A. first means for removing oxygen, carbon dioxide, nitrous oxides, hydrocarbons and steam from the waste gas to produce a scrubbed waste gas; and  B. xenon separating means comprising a first container;  C. a compressor adapted to receive the xenon-free scrubbed waste gas from the first container, compress it and discharge it to a second container; and  D. krypton separating means comprising the second container: 3. A plant according to claim 2, in which said krypton separating means further comprises a subsequent adsorber which has means for nitrogen cooling same and is filled with active carbon. 4. A plant according to claim 2, further comprising a second compressor with a high and low pressure side, and which includes a bypass line interconnecting said high and low pressure side of said compressor, a control member being interposed in said bypass line said second compressor adapted to receive waste gas from the waste gas outlet of the dissolver; and adapted to discharge to the waste gas purifying means. 5. A plant according to claim 2, which includes heat exchanger means adapted to transfer heat between gases entering and exiting the xenon separating means. 6. A plant according to claim 2, which includes a heat exchanger means adapted to transfer heat between gases entering and exiting the krypton separating means. 7. A plant according to claim 6, which includes at least two additional xenon separating means arranged in parallel. 8. A plant according to claim 7, which includes another krypton separating means arranged in parallel. 9. A plant according to claim 7, which includes heat insulated container means for krypton common to and housing both the xenon separating means and the krypton separating means. 10. A plant according to claim 9, in which said heat insulating container means is formed by a vacuum container.