EXTENSION OF THE TRANSURANUS BURNUP MODEL TO HEAVY-WATER REACTOR CONDITIONS

The extension of the light water reactor burnup equations of the TRANS URANUS code to heavy water reactor conditions is described. Existing m odels for the fission of U-235 and the buildup of plutonium in a heavy water reactor are evaluated. In order to overcome the limitations of the frequently used RADAR model at high burnup, a new model is present ed. After verification against data for the radial distributions of Xe , Cs, Nd and Pu from electron probe microanalysis, the model is used t o analyse the formation of the high burnup structure in a heavy water reactor. The new model allows the analysis of light water reactor fuel rod designs at high burnup in the OECD Halden Heavy Water Reactor. (C ) 1998 Elsevier Science B.V. All rights reserved.