A new chromium-nickel alloy has been developed CHS 129 (Cr-34-37%; Mo-1-2%; Fe-0.2-5%; and, the rest is Ni) for radiochemical equipment operating in nitrogen-fluoride media in the nuclear-cycle technology. From dissolution of spent fuel from fuel elements to storage of radioactive wastes, including gas-steam flows containing dust. The chemical composition of the alloy and the smelting method are protected by inventor's certificates.Comparing with the world and Russian analogs of alloys employed in the technology for reprocessing corrosive radioactive solutions shows that the alloy CHS 129 is at least as corrosion resistant but it is easier to process.The technology was perfected and the production of sheets and pipes was assimilated first at Russian plants.A series of investigations of the corrosion, mechanical, strength, technological, metallographic, and radiation properties of the alloy CHS 129 was performed according to the program of the Gosatomnadzor of Russia. The results of the tests make it possible to recommend the alloy for fabrication of radiochemical equipment. The alloy is included in the radiochemical standards. Technical conditions for the sheets and pipes made of CHS 129 alloy have been developed.The alloy is used to fabricate equipment operating at the Industrial Association "Chepetskii Mechanical Plant" and the Pridneprov Chemical Combine. Equipment for the main technology for reprocessing radioactive wastes at the industrial association "Mayak" and the Sverdlovsk Scientific-Research Institute of Chemical Machines has been manufactured and is currently being manufactured.The use of the alloy CHS 129 makes it possible to increase the service life of equipment used in the reprocessing of highly corrosive media, as compared to stainless steel, from 1-3 up to 10-15 yr.

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