Graduate Thesis Or Dissertation
 

External Coupling of Computational Fluid Dynamics Modeling of the Density Evolution Inside of the Helium-3 Enhanced Negative Reactivity Insertion (HENRI) System with the Monte-Carlo Neutronics code Serpent 2

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6m311w950

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  • The testing of nuclear fuel under reactivity-initiated accident (RIA) conditions is paramount for the better understanding of the fuel’s behavior during these transient accident events. The Transient Reactor Test (TREAT) facility is a nuclear reactor that will be capable of recreating the thermal-hydraulic and neutronic boundary conditions representative of RIA events for light water reactors (LWRs). However, one of the engineering challenges to perform such fuel tests is to increase the energy deposition on the fuel sample by reducing the current TREAT’s pulse width of 89 milliseconds down to 40 milliseconds. Idaho National Laboratory (INL) proposed to clip the pulse by inserting helium-3, a strong neutron absorber, into an annular control rod using a gas injection system known as the Helium-3 Enhanced Negative Reactivity (HENRI) facility. This study outlines the process of the coupling of the computational fluid dynamics (CFD) model of HENRI built in STAR CCM+, with the reactor physics code, Serpent 2. The coupling of these two codes is pursued in order to provide a more representative analysis of the TREAT reactor reactivity transient when the HENRI cartridge system is deployed. Specifically, to outline the effectiveness of the HENRI cartridges capability of inserting 5% negative reactivity in 5 msec in order to “clip” TREAT. Using the coupling of STAR-CCM+ and Serpent 2 it can be shown that the activation of 4 HENRI cartridges with an initial pressure of 3.45 MPa leads to an insertion of 13% negative reactivity within 4 milliseconds.
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