A collision probability analysis of the double-heterogeneity problem
- Commissariat a l'Energie Atomique, Yvette (France)
A practical collision probability model is presented for the description of geometries with many levels of heterogeneity. Regular regions of the macrogeometry are assumed to contain a stochastic mixture of spherical grains or cylindrical tubes. Simple expressions for the collision probabilities in the global geometry are obtained as a function of the collision probabilities in the macro- and microgeometries. This model was successfully implemented in the collision probability kernel of the APOLLO-1, APOLLO-2, and DRAGON lattice codes for the description of a broad range of reactor physics problems. Resonance self-shielding and depletion calculations in the microgeometries are possible because each microregion is explicitly represented.
- OSTI ID:
- 6011741
- Journal Information:
- Nuclear Science and Engineering; (United States), Vol. 115:2; ISSN 0029-5639
- Country of Publication:
- United States
- Language:
- English
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