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This report discusses various aspects related to the use and validity of the general purpose Monte Carlo code MCNP for multigroup/adjoint calculations. The increased desire to perform comparisons between Monte Carlo and deterministic codes, along with the ever-presem desire to increase the efficiency of large MCNP calculations has produced a greater user demand for the multigroup/adjoint capabilities. To more fully utilize these capabilities, we review the applications of the Monte Carlo multigroup/adjoint method, describe how to generate multigroup cross sections for M CNP with the auxiliary CRSRD code, describe how to use the multigroup/adjoint capability in MCNP, and provide examples and results indicating the effectiveness and validity of the MCNP multigroup/adjoint treatment. This information should assist users in taking advantage of the MCNP multigroup/adjoint capabilities.

Development of the v4.2m5 and v5.0m0 MG Cross Section Libraries for MPACT CASL-U-2017-1280-000 v Consortium for Advanced Simulation of LWRs Development of the v4.2m5 and v5.0m0 MG Cross Section Libraries for MPACT CASL-U-2017-1280-000 1 Consortium for Advanced Simulation of LWRs Development of the v4.2m5 and v5.0m0 MG Cross Section Libraries for MPACT Consortium for Advanced Simulation of LWRs 2 CASL-U-2017-1280-000 2. ACCURACY GOALS Development of the v4.2m5 and v5.0m0 MG Cross Section Libraries for MPACT CASL-U-2017-1280-000 5 Consortium for Advanced Simulation of LWRs Development of the v4.2m5 and v5.0m0 MG Cross Section Libraries for MPACT Consortium for Advanced Simulation of LWRs 10 CASL-U-2017-1280-000 Development of the v4.2m5 and v5.0m0 MG Cross Section Libraries for MPACT CASL-U-2017-1280-000 13 Consortium for Advanced Simulation of LWRs Development of the v4.2m5 and v5.0m0 MG Cross Section Libraries for MPACT

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