Quantitative analysis of the fission product distribution in a damaged fuel assembly using gamma-spectrometry and computed tomography for the Phébus FPT3 test

The method was validated over the pre-test examination of the fuel bundle, through a comparison with the classical gamma analysis method used at the laboratory for objects of known geometry. The final results, given with acceptable uncertainties, gave for all FPs identified (mainly 137Cs, 131I, 132Te, 140Ba, 95Zr, 103Ru, etc.) their quantitative activity profile along the bundle, their retained and released fractions in the bundle, and also some information about their relocation inside the bundle. The results are in very good agreement with other Phébus FPT3 measurements and inventory calculations.