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A. sethod of coupling two-dimensional discrete oriinates calculations with Mcnte Carlo calculations is incorpcr&ted in •Uie MEiO code. In particular, DOT, a tvo-dimensional discrete ordinates code, has been coupled with MORSE, a Monte Carlo code. The discrete ordinates calculation is limited to an r-z geceetry. Either the DOT boundary angular fivxec or the angular fluxes at internal surfaces say be input to DOMINO. Any amount of su.-face inay be used in DOMINO; i.e., frori all aesh intervals down to a portion of one interval. The radii/ axes, and quadrature set nust be read into DOMINO. Appropriate cumulative probability distributions ais calculated free the angular fluxes and written on a DOMINO tape. Four different types of DOMINO tapes may be written for use in Monte Carlo codes-upward from a disk, downward from a disk, inward from a cylindrical surface, and outward from a cylindrical surface. The DOMINO tape contains all necessary coupling information for use by the Monte Carlo code. The MORSE cal culation may utilize this data in four ways: (1) as a source foi a forward MORSE case; (2) as a scoring function for an adjoint MORSE case; (3) as a source for an adjoint MORSE case; or (4) as a scoring function for a forward MORSE case. A detailed discussion of the coupling operation as well as a sample problem are included in the appendices. Logical flow charts of the routines are also presented.

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