Neutron Reflector Analysis for the Beam-Port of the Missouri S&T Reactor


A preliminary neutron reflector material selection and feasibility study of an inexpensive reflector replacement for the neutron beam-port at the 200 kW Missouri University of Science and Technology Research Reactor (MSTR) was conducted using Monte-Carlo techniques. The Monte-Carlo N-Particle transport code (MCNP6.1) was used to model the neutron beam-port of the Missouri S&T Reactor in order to study the effects of adding different reflector materials, in terms of the neutron flux reaching the radiography/tomography facility in front of MSTR's neutron beam-port. Aluminum, beryllium, titanium, nickel, nickel-58, lead, bismuth, tungsten and stainless steel reflectors were modeled to find the best neutron reflector for the beam-port. After examining reflector materials, it was concluded that none of them were an improvement over the current design. Experimental thermal flux was measured to be 1.0 x 107 ± 3.16 x 103 cm-2 s-1 at the exit of beam port for current version of beam-port. The current ratio of beam port inlet and outlet obtained from simulations was found to be 3.37 x 104. The flux of beam port inlet was determined on the order of 1.0 x 1011 cm-2 s-1 which is consistent with previous findings.


Nuclear Engineering and Radiation Science

Research Center/Lab(s)

Center for Research in Energy and Environment (CREE)


This study was supported by Marmara University, Scientific Research Commission (BAPKO) under the research Project FEN-A-131016-0466.

Keywords and Phrases

Inexpensive Neutron Reflector; Monte Carlo N-Particle (MCNP); Neutron Beam-Port

International Standard Serial Number (ISSN)

0236-5731; 1588-2780

Document Type

Article - Journal

Document Version


File Type





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Publication Date

01 Nov 2019