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Rim Instant Release Radionuclide Inventory From French High Burnup Spent UOX Fuel

  • D. Roudil (a1), C. Jegou (a1), V. Broudic (a1) and M. Tribet (a1)

Abstract

To assess the long-term behavior of spent fuel in a nuclear waste repository, the chemical reactions between the fuel and possible intruding water must be understood and the resulting radionuclide release must be quantified. The instant release fraction (IRF) source term assumed to be instantaneously accessible to water after the failure of the waste container. Some IRF values for different kinds of spent fuel are available in the literature. However, the possible contribution the rim restructured zone for high-burnup UOX fuels, was not necessary taken into account. A specific study of the leaching behavior of the rim zone has been carried out on a UOX fuel sample with a burnup of 60 GWd·t-1 and 2.8% FGR. The 134/137Cs and 90Sr rim IRF are effectively higher than the gap and grain boundary inventories (respectively 4.4 wt% and 0.3 wt% of the total Cs and Sr inventories). Nevertheless because of the relative small volume of this zone in the pellet, the impact of the rim inventory appears to be limited and the complete Cs and Sr IRF (gap, grain boundaries and rim), were estimated at 1.85 and 0.3 wt%, respectively

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1 Johhson, L., Ferry, C., Poinssot, C. and Lovera, P., J. Nucl. Mater. 346 p 56
2 Roudil, D., Jegou, C., Broudic, V., Muzeau, B., Peuget, S., J. Nucl. Mater. 362 p 411
3 Lovera, P., Ferry, C., Poinssot, C., Johnson, L., Synthesis report on the relevant diffusion coefficients of fission products and helium in spent nuclear fuels, CEA-Report CEA-R-6039 (2003)
4 Gray, W.J. and Strachah, D.M., Mat. Res. Soc. Symp. Proc. 212 p.205

Rim Instant Release Radionuclide Inventory From French High Burnup Spent UOX Fuel

  • D. Roudil (a1), C. Jegou (a1), V. Broudic (a1) and M. Tribet (a1)

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