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The Risoe National Laboratory in Denmark have carried out three irradiation programs of slow ramp and hold tests, so called 'bump tests' to investigate fission gas release and fuel microstructural changes. The third and final project which took place between 1986 and 1990 bump tested fuel re-instrumented with both pressure transducers and fuel centreline thermocouples. The innovative technique employed for re-fabrication involved freezing the fuel rod to hold the fuel fragments in position before cutting and drilling away the centre part of the solid pellets to accommodate the new thermocouple.
The fuel used in the project was from: IFA-161 irradiated in the Halden BWR (irradiation history provided) 13 to 46 MWd/kgUO2, GE BWR fuel irradiated in Quad Cities 1 and Millstone 1 20 to 40 MWd/kgUO2 and ANF PWR fuel irradiated in Biblis A to 38 MWd/kgUO2.
The data from the project are particularly valuable because of the in-pile data on fuel temperatures and pressures as well as extensive post irradiation examination (PIE).
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Keywords: experimental data, fission gas release, fission products, fuel elements, fuel pellets, fuel rods, fuel-cladding interaction, fuel-coolant interactions, helium, xenon.