GFR Sub-Assembly Shielding Design Studies Page: 4 of 16
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Abstract
This report presents the methodology and results for a preliminary study for Gas-
Cooled Fast Reactor (GFR) subassembly fast neutron shielding configurations. The
purpose of the shielding in the subassembly is to protect reactor components from fast
(E>0.1 MeV) neutrons. The subassembly is modeled in MCNP version 5 release 1.30.
Parametric studies were performed varying the thickness of the shielding and calculating
the fast neutron flux at the vessel head and the core grid plate. This data was used to
determine the minimum thickness needed to protect the vessel head and the core grid
plate. These thicknesses were used to analyze different shielding configurations
incorporating coolant passages and also to estimate the neutron and photon energy
deposition in the shielding material.iii
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Parry, J. R. GFR Sub-Assembly Shielding Design Studies, report, January 1, 2006; [Idaho Falls, Idaho]. (https://digital.library.unt.edu/ark:/67531/metadc881174/m1/4/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.