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Published: 1982

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Irradiated uranium aluminide fuel plates of 40% U-235 enrichment were heated for the determination of fission products released under flowing helium gas at temperatures up to and higher than the melting point of fuel-cladding material. The release of fission products from the fuel plate at temperature below 500°C was found negligible. The firist rapid release of fission products was observed with the occurrence of blistering at 561 +- 1°C on the plates. The next release at 585°C might be caused by melting of the cladding material of 6061-Al alloy. The last release of fission product gases was occurred at the eutectic temperature of 640°C of U-Al(subscript x). The released material was mostly xenon, but small amounts of iodine and cesium were observed.