Many combinations of cladding and core materials which are difficult to dissolve are, or will be, used in power reactor fuels. Processes developed for decladding or total dissolution of these fuels use nitric acid, nitric acid-ferric nitrate, neutral and acidic fluoride, sulfuric acid, dilute aqua regia, sodium hydroxide, and sodium hydroxide-sodium nitrate solutions. No commercially available material was found which had desirable corrosion resistance in a wide variety of these environments and which could be used without post-welding heat treatment. An alloy development study, involving primarily nickel-base alloys, disclosed some compositions which have good corrosion resistance in most of the environments concerned and which do not require post-welding heat treatment. ^pHE dissolution' of power reactor fuels with corrosion re-* sistant claddings requires solvents quite corrosive to the common materials of chemical plant construction. Fuel claddings include zirconium alloys, stainless steel, and aluminum.Common core compositions include metallic uranium,
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