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One of the fuel types transient tested in the Third Riso Fission Gas Project released 5-7% of its fission gas in the power range 3.6 to 17 kW/m during the ramp. Isotopic analysis revealed that compared with fission gas released at powers above 30 kW/m, this gas contained lower concentrations of 83Kr and 131Xe. This suggests that it had left the UO(2) matrix during the base irradiation and had been for a long period isolated from the rest of the gas generated. It is proposed here, therefore, that the gas released at low power had emanated from large pores, which were vented when the fuel cracked during the ramp.

Additional information

Authors: MOGENSEN M, Riso National Laboratory, Roskilde (DK);BAGGER C, Riso National Laboratory, Roskilde (DK);TOFTEGAARD H, Riso National Laboratory, Roskilde (DK);KNUDSEN P, Riso National Laboratory, Roskilde (DK);WALKER C T, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: IAEA Meeting on Fission Gas Release and Fuel Rod Chemistry Related to Extended Burn-up, Chalk River (CA), April 28 - May 1, 1992
Availability: Available from (1) as Paper EN 36845 ORA
Record Number: 199210802 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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