Abstract
The High-Resolution Gamma Tomography System (HRGTS) facility is under development at the University of Michigan. This system is planned generally for application to two-phase flow loops representing nuclear fuel bundles. These measurements should provide insight into fluid dynamics phenomena and high resolution data for validation of computational fluid dynamics (CFD) codes. The HRGTS is planned to be deployed in the Michigan Advanced Rod Bundle fLow Experiment (MARBLE). an adiabatic test loop consisting of an 8x8 square lattice arrangement. Simulations modeling MARBLE were performed to study how the counting statistics of the imaging process propagate into void fraction uncertainty. The simulation results showed that an accuracy of around 1% is expected with imaging times of 1 min. Computed tomography measurements were performed on partial mockups of the bundle geometry, which confirmed that the technique can be used to obtain accurate subchannel void fraction data in complicated and challenging measurement scenarios.
Highlights
In recent years, significant research effort has been dedicated to the development of advanced two-phase models implemented in computational fluid dynamics (CFD) and subchannel codes, for applications in nuclear reactor systems
The High-Resolution Gamma Tomography System (HRGTS) is planned to be deployed in the Michigan Advanced Rod Bundle fLow Experiment (MARBLE). an adiabatic test loop consisting of an 8x8 square lattice arrangement
Computed tomography measurements were performed on partial mockups of the bundle geometry, which confirmed that the technique can be used to obtain accurate subchannel void fraction data in complicated and challenging measurement scenarios
Summary
Significant research effort has been dedicated to the development of advanced two-phase models implemented in computational fluid dynamics (CFD) and subchannel codes, for applications in nuclear reactor systems. Gamma sources allow relatively convenient access to higher energies compared to standard medical X-ray tubes This can be employed in a computed tomography arrangement in order to get localized information, it is more commonly applied in a densitometry-style setup where information is obtained in specific regions or along specific lines (Wang, 2015). The source and detector array are mounted on a rotary table with a large hole to accommodate tall objects to be imaged, and moves vertically on a gantry to allow layer-by-layer scanning to combine 2D images into 3D images This system is planned to be deployed to perform measurements of the Michigan Advanced Rod Bundle fLow Experiments (MARBLE) facility, which is currently being constructed. Tests were made assuming thicker-walled fuel pins in the mock-up, which represent experimental arrangements typical of high-pressure systems, to illustrate the system potential in future applications beyond the MARBLE facility
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