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Recent Developments to the Monte Carlo Code MCBEND

P. Cowan, G. Dobson, G. A. Wright, A. Cooper

Nuclear Technology / Volume 168 / Number 3 / Pages 780-784

December 2009


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MCBEND is a well-established Monte Carlo code from The ANSWERS Software Service in the United Kingdom. It is being continually developed to meet the needs of its users. Recent developments to MCBEND are described here. These cover improvements to the underlying physics and data libraries, improvements in calculation efficiency, and improvements to the usability of the code.

Recent developments include a Unified Tally option for scoring, including enhanced methods for scoring by material; extension of point energy adjoint calculations to include detailed thermal treatment; incorporation of a covariance library for detector cross sections; a number of new "hole" geometries in which Woodcock tracking takes place, including a tetrahedral mesh hole that imports a converted computer-aided design file; a new collision processor; and automatic meshing for acceleration of gamma-ray calculations.

These developments have resulted in more flexibility in scoring, for example, the ability to score by material in regions incorporating Woodcock tracking; potentially more accurate adjoint calculations utilizing thermal detectors; automatic calculation of uncertainty due to detector cross sections; greater flexibility in geometry modeling; improved collision processing, for example, the ability to utilize bound data for thermal neutron transport in graphite; and less user input for efficient calculation acceleration.

Some recent developments of MCBEND are described and examples of their use given.

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