Abstract
The Small, Modular Advanced High Temperature Reactor (SmAHTR) is a preconceptual design for a fluoride salt-cooled small modular reactor (SMR) [1]. In this paper, a stylized 2D benchmark problem set has been created based on SmAHTR. Certain gaps and considerations in burnable poison and control rod content were unspecified/undetermined in the preconceptual design, but those gaps were filled for the stylized problem set. With those features, this problem set could then be used for benchmarking neutron transport methods as well as its low order methods in 2D single assembly and full core configurations. For this benchmark set, continuous energy Monte Carlo calculations were performed. Those calculations provided keff values of 0.9459 (± 11 pcm) and 1.1436 (± 12 pcm) in the full core configuration with all the control rods fully inserted and withdrawn, respectively. The single assembly calculations yielded an eigenvalue, kinf, of 0.9987 (± 15 pcm) and 1.2117 (± 15 pcm) with all of the control rods either inserted or removed, respectively. In the full core configuration, the worth of all the control rods and burnable poison particles were determined to be 197.6 (± 0.16) mk and 311.6 (± 0.23) mk, respectively. The corresponding results in the single assembly configurations are 213 (± 0.21) mk and 337.4 (± 0.20) mk, respectively. A near-critical configuration was also determined for the reactor by inserting control rods in some assemblies, thus providing a case with a keff value of 0.9909 (± 12 pcm).
Highlights
The Oak Ridge National Laboratory report on the preconceptual SmAHTR discusses parameters and specifications essential to the design, such as the fuel type, coolant, and core configuration
All of these options for assembly configuration were discussed in the paper, the cylindrical pin fuel type is of consideration for this set of stylized benchmark problems
The worth was calculated for the control rods and burnable poison rods in the assembly: 213 (± 0.21) mk and 337.4 (± 0.20) mk, respectively
Summary
The Oak Ridge National Laboratory report on the preconceptual SmAHTR discusses parameters and specifications essential to the design, such as the fuel type, coolant, and core configuration. The fuel choices discussed in the report are different forms of graphite-suspended TRISO particles including plank fuel type, annular pin fuel type, and cylindrical pin fuel type. All of these options for assembly configuration were discussed in the paper, the cylindrical pin fuel type is of consideration for this set of stylized benchmark problems. This design did not specify any control mechanisms for the core in either the form of burnable poison or control rods. To create a complete set of benchmark problems containing controlled and critical cases, the addition of control mechanisms was necessary and discussed below
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