Abstract

A new computer code PREC was developed to solve neutron and nuclide density distributions at the equilibrium cycle of pebble bed reactors. The PREC code has the following special advantages. 1. To provide a direct solution of the equilibrium cycle2. To fix the effective multiplication factor as an input3. To treat continuous fuel movement4. To treat r-z two-dimensional geometry, leading in turn to the following special advantages: (4-1) Ability to treat the cavity at the top of the core (4-2) Ability to treat the curved fuel stream-line.

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