Development of radiation transport code in three-dimensional (X, Y, Z) geometry for shielding analyses by direct integration method.

概要

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A three-dimensional radiation transport code TRISTAN has been developed by applying the method of direct integration to the group-flux calculation in order to enhance the accuracy of shielding analysis. It uses group-angle transfer matrices derived from the double-differential cross section data instead of the Legendre polynomial expansion.<BR>In order to improve the numerical accuracy, a technique to separate radiation into two components (the scattered and the unscattered) is adopted and the balance equation of radiation flux is applied to the solution method. Two new techniques, a stratification of the angular mesh and a kind of the forward-adjoint coupling, are introduced to enhance its applicability to the practical shielding analysis.<BR>The validity of the TRISTAN is verified by making comparison with the results of the Monte Carlo code MCNP, and with the experimental values in the JRR-4 streaming experiments.
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