Nuclear Science and Engineering / Volume 8 / Number 3 / September 1960 / Pages 254-259
Technical Paper / dx.doi.org/10.13182/NSE60-A25807
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Criticality conditions suitable for hand calculations are derived for reactor control rod configurations of practical interest. Two-group diffusion theory is applied to (a) arrays of several control rods of different materials, sizes, shapes, radial, and angular location; (b) reflected cores containing a symmetric ring of similar rods, with or without an axial rod. The reduction to elementary cases is demonstrated.