A method· of computing resonance absorption in either slab or circularized reactor cells is developed and used to write a FORTRAN program, RABBLE, for the CDC-3600. Since the method uses space-and lethargydependent slowing-down sources, the ·program is well suited for the computation of resonance absorption when the effects of overlapping between resonances is significant. The cell is divided into regions, and the energy range of interest is divided into extremely narrow groups. Regional reaction rates are obtained from the slowing-down sources, first-flight transmission and escape probabilities, and interface currents. These regional reaction rates are accumulated over specified.numbers of groups to yield effective cross sections.

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