Monte Carlo simulation of additional safety control rod for commercial MNSR to enhance safety

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Date

2012-06

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Annals of Nuclear Energy

Abstract

A Monte Carlo simulation of additional safety rods for NIRR-1 HEU and LEU cores was carried out using the MCNP5 version 1.6 code. Two additional safety control rods having the same material composition as the main central control rod except for the surface area were studied. The following reactor core physics parameters were determined; neutron flux distribution within the core with safety rods withdrawn, control rod (CR) worth for each rod, core excess reactivity, shutdown margin and some kinetic parameters. Results obtained indicate that it would be feasible to include two additional safety control rods to improve safety level of the MNSR with little or no modification to the existing core configuration. © 2012 Elsevier Ltd. All rights reserved.

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Keywords

Control rod worth, Excess reactivity, HEU, LEU, MNSR, Shutdown margin

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