Author(s)

G.H. Yeoh & G.J. Storr

Abstract

A three-dimensional study of the heat and mass transfer within the irradiation space of the HIFAR fuel element G. H. Yeoh & G. J. Storr Australian Nuclear Science & Technology Organisation (ANSTO), Lucas Heights, Australia. Abstract A three-dimensional mathematical model for the HIFAR fuel element is described. The thermal-hydraulics behaviour within the irradiation space in the fuel element has been investigated. Effective cooling of the target cans could be obtained from the current operational settings. Complex flow structures were observed in the liner and support tube nose cones area. Large temperature gradients were found across the UO] pellets and MgO powder. The predicted central temperature in the UO] pellets was 2550 K. Maximum surface temperatures on the outer wall of the target cans were found to be 370 K for the first can and 380 K for the second can respectively. These values were comparable with experimental measurements and within the normal ope

Keywords