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Neutron/Gamma Ray Source Measurement and Analyses of High Burnup UO2/MOX Fuel Rods

Axial directional neutron and gamma ray source measurement of fuel rods and radial directional gamma ray source measurement of fuel pellets were carried out for LWR high burn-up UO2 and MOX spent fuels. C/E values with ORIGEN-2 code are discussed for axial neutron and gamma ray source distributions of fuel rods. The radial gamma ray source distribution of a fuel pellet shows Cs migration/vaporization phenomena during irradiation. Using the radial gamma ray source distribution data of Cs-134 and Cs-137, the Cs migration/vaporization time during irradiation can be estimated.