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Plutonium-uranium mixed oxide (MOX) fuel rods of instrumental rig IFA-591 were ramped in HBWR to study the Advanced Thermal Reactor (ATR) MOX fuel behaviour during transient operation and to determine a failure threshold of the MOX fuel rods. Eleven segments were base-irradiated in ATR "FUGEN" up to 18.4 GWd/t. Zirconium liner claddings were adopted for four segments of them. As the results of non-destructive post irradiation examinations (PIEs) after the base-irradiation and before the ramp tests, no remarkable behaviour affecting the integrity of fuel assembly and fuel rod was confirmed.
Keywords: MOX, fuel behaviour, plutonium, power ramp, uranium.