A user-simplified version of MORSE/BREESE-II for use in the design of shielded cells for gamma ray sources

A preprocessor, PLMBOB, has been written to prepare the input for the MORSE/BREESE-II code for labyrinth/source room geometries. The gamma ray source configuration can be any cylindrical object, such as a pipe, tank, valve, pump, etc. In addition, a post-processor, POST, was written to combine runs consisting of the same source and detector configuration. In addition, POST has the ability to combine the individual responses from multiple sources. To improve the computational efficiency, albedos were employed to avoid tedious and time-consuming tracking of particles in concrete. PLMBOB was tested for two applications typical of a nuclear power plant. The first application was to test a PLMBOB input against a full transport calculation for the spent resin tank labyrinth at Tennessee Valley Authority s Sequoyah nuclear power plant. The second application was to test PLMBOB's geometry input with a problem having a few geometric enhancements - the "panoramic irradiator" experiment performed in the diesel generator building at Watts Bar nuclear power plant. The results for the spent resin tank labyrinth albedo problem agreed favorably with those of the full transport calculations. The comparison of the measured dose rates to the calculated dose rates also showed a good agreement. The consistency in the results for the spent resin tank labyrinth demon strated that the albedo information and albedo processing routines cor rectly estimate the reflection of particles from concrete walls. The panoramic irradiator experiment led to essentially the same conclusions as well as showing that the PLMBOB package is ready for most in-the-field applications at a nuclear power plant.