Abstract
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.
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