Enhanced diffusion under alpha selfirradiation in spent nuclear fuel: Theoretical approaches
Abstract
Various theoretical approaches have been developed in order to estimate the enhanced diffusion coefficient of fission products under alpha selfirradiation in spent nuclear fuel. These simplified models calculate the effects of alpha particles and recoil atoms on mobility of uranium atoms in UO _{2}. They lead to a diffusion coefficient which is proportional to the volume alpha activity with a proportionality factor of about 10 ^{44} (m ^{5}). However, the same models applied for fission lead to a radiationenhanced diffusion coefficient which is approximately two orders of magnitude lower than values reported in literature for U and Pu. Other models are based on an extrapolation of radiationenhanced diffusion measured either in reactors or under heavy ion bombardment. These models lead to a proportionality factor between the alpha selfirradiation enhanced diffusion coefficient and the volume alpha activity of 2 × 10 ^{41} (m ^{5}).
 Publication:

Journal of Nuclear Materials
 Pub Date:
 November 2005
 DOI:
 10.1016/j.jnucmat.2005.04.072
 Bibcode:
 2005JNuM..346...48F
 Keywords:

 28.41.K;
 66.30;
 61.80