Abstract
The change in reactivity due to the change in transport cross section in an inclusion in the form of a cylinder or a plain layer is expressed as a perturbation of the neutron ftux at some distance from the inclusion, where the diffusion approximation holds. By using the results of flux calculations in the layer mediunh and in the cylinder, a relation may be found between the change in reactivity and the characteristics of the inclusion (such as transport cross section, volume, shape, where it is located, etc.). The effect of shape shows up in the coefficients B‖ and B⊥ being different from unity. These same coefficients are what determine the average diffusion coefficients D⊥ and D‖, An interpolation formula is constructed for B⊥ based on the various limiting expressions.
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Additional information
Translated from Atomnaya Énergiya, Vol. 14, No. 4, pp. 364–370, April, 1963.
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Shevelev, Y.V. Effect of single channels and slits on reactivity. At Energy 14, 369–376 (1964). https://doi.org/10.1007/BF01114507
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DOI: https://doi.org/10.1007/BF01114507