The code does not contain built- in or internal chains. The isotopic chains, which can contain any number of isotopes are formed by the user. The burnup rate is determined by the zone and energy-averaged cross sections which are recomputed after each time-step. Adjoint solutions are obtained by inverting the input data and redefining the source terms. Group re-balancing and successive over-relaxation with line inversion are used to accelerate convergence. 2 - Method of solution: Eigenvalues are computed by standard source- iteration techniques. The code can be used to - (a) compute k eff and perform criticality searches on time absorption, reactor composition, and reactor dimensions by means of either a flux or an adjoint model, (b) compute material burnup using a flexible material shuffling scheme, and (c) compute flux distributions for an arbitrary extraneous source. International Nuclear Information System (INIS)ฤก - Description of problem or function: 3DB is a three-dimensional ( x-y-z, r-theta-z, triangular-z) multigroup diffusion code for use in detailed fast-reactor criticality and burnup analysis. 3-DB, 3-D Multigroup Diffusion, X-Y-Z, R-Theta-Z, Triangular-Z Geometry, Fast Reactor Burnup
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