ANL-CANDID, A Two-Dimensional, Diffusion-Theory Code Based on CANDID2D
ARGONNE NATIONAL LAB IL
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ANL-CANDID is an extension and modification of the two-dimensional diffusion-theory code CANDID2D developed by Computer Applications Incorporated for use on the Control Data Corporation 3600 computer. The code, as delivered, was capable of performing a reactivity calculation as well as geometry, composition, and buckling searches. These calculations were limited to rz geometry. In addition, the code could perform an up-scattering calculation. The present code is the result of extending and modifying the C.A.I. code. The extensions include the capability of performing calculations in xy and r theta geometry, including the full periodic case. Adjoint and source calculations were added with an acceleration procedure for the source calculation. In addition, an alpha calculation was added. The use of two-term Chebyshev extrapolation was retained however, the strategy for employing it was changed. In addition, the strategy employed in the search procedure was completely changed. Mesh refinement and restart capability have been provided.
- Numerical Mathematics