Design of a permanent epithermal neutron irradiation site in the Syrian MNSR |
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| Authors: | Ismail Shaaban |
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| Affiliation: | 1. Nuclear Science and Engineering Department, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;2. Nuclear Engineering Department, University of California, Berkeley, Berkeley, CA 94720-1730, USA;1. Key Laboratory of Neutronics and Radiation Safety, Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China;2. University of Science and Technology of China, Hefei, Anhui 230027, China;3. National Nuclear Reactors Research Centre, National Nuclear Research Institute, Ghana Atomic Energy Commission, Box LG 80, Legon-Accra, Ghana;4. Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Su Zhou 215006, China;1. Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, Japan;2. Nuclear Professional School, School of Engineering, The University of Tokyo, Japan;3. Hitachi-GE Nuclear Energy, Ltd., Japan |
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| Abstract: | A permanent epithermal neutron irradiation site was designed in the Syrian Miniature Neutron Source Reactor (MNSR) by using cadmium as a thermal neutron shielding material. This site was designed by Cd-shielding the internal surface of the outer aluminum tube of the FOIS (First Outer Irradiation Site) in the MNSR. The MCNP-4C calculations showed that, to have a permanent epithermal neutron irradiation site for the ENAA using the cadmium, it is necessary to add the top beryllium shims of the reactor to compensate for the reactivity losses due to the neutrons absorption in the cylindrical cadmium shell. The activation detectors were used to measure the thermal and epithermal neutron fluxes in the FOIS. Distribution of the thermal neutron flux along the vertical direction of the outer irradiation capsule used in the FOIS has been found using MCNP-4C code, and experimentally by irradiating five copper wires. Good agreements were obtained between the calculated and the measured results. |
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