SPACE-ENERGY CELL HOMOGENIZATION
Fine-structure nuclear analysis program S was extended to provide properly averaged nuclear data for gross-structure analysis work. The input extension consists of the gross-structure space-energy lattice. Cell honiogenization is performed by dircct space-energy integration of each of the reaction-rate terms in the transport equation, with preservation of the detailed balance of leakage, collision, scatter-transfer, fission production, and fixed- source production. On a flexible fluxor-adjoint weighted space-energy cell basis, the extended output includess cell-homogenized cross sections for collision, absorption, scatter, scatter-transfer, and fission multiplication; field depression or accentuation; leakage; surface albedo; and field diffusion coefficient, with inclusion of lumped-void leakage enhancement and other fine- structure heterogeneity effects. Specific areas of immediate engineering applicability in GEANPD fuel loading and gross power shaping work on epithermal reactors includes (1) two-energy albedo input to program K with inclusion of the effects of complex control rod cell structure and of energy degradation within a control rod cell, (2) complete three-energy input to program CURE and to program F/sub 3/ with inclusion of the effects of fine-stnacture void channels and strong absorbers and of three-energy control-rod cell albedos, and (3) nineteen-energy flux depression factors and control-rod cell albedos for input to program G/sub 2/ . (auth)
- Research Organization:
- General Electric Co. Aircraft Nuclear Propulsion Dept., Cincinnati
- DOE Contract Number:
- AF33(600)-38062; AND AT(11-1)-171
- NSA Number:
- NSA-13-019427
- OSTI ID:
- 4211530
- Report Number(s):
- APEX-489
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- United States
- Language:
- English
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