The Convenient Monte Carlo Code MULTI-KENO for Criticality Safety Analysis of Transport Casks

In criticality safety analysis of transport casks, an infinite array of fuel rods using a homogeneous cell is normally assumed, since the calculation configurations of transport casks are, in many cases, complicated. Criticality calculations are performed with the homogeneous cell. In the case of a transport cask, using the homogeneous cell is not adequate, since there are many fuel rods contacting reflectors in comparison with the total number of fuel rods. We developed a Monte Carlo code MULTI-KENO (Naito et al. 1983) at Japan Atomic Energy Research Institute (JAERI) in 1983. MULTI-KENO was developed to express a configuration exactly without performing the cell calculation by introducing the concept of'SUPER BOX'. In this paper, we show some features of MULTI-KENO and an example of calculations by MULTI-KENO.