Abstract
The pressurized heavy-water reactors (PHWRs) use rod clustered fuel assemblies. This paper discusses a new approach for solving multigroup integral transport equation in cylindricalized cells containing fuel in the form of clusters. The method, based on a combination of interface currents formalism and first-flight collision probabilities ( P ij method), is essentially an extension of an earlier reported work of the author. A computer code club was written incorporating this calculational procedure. The validity of the physical formulation was established through extensive analyses of 7–19- and 28-rod cluster experiments with D 2O or air as coolant. The results from this approach were also compared with those from a more sophisticated code cop also developed here using complete P ij method for the cluster lattice cells. There is a very good agreement between the calculated results of the two formalisms. It is also observed that the results of club agree well with the measured values of experiments analysed.
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