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Your search keyword '"Feng, B."' showing total 99 results
Start Over Author "Feng, B." Publication Type Conference Materials
99 results on '"Feng, B."'

25. MSRE TRANSIENT BENCHMARKS USING SAM.

Author

Margulis, M., Blaise, P., Fei, T., Hua, T., Feng, B., Heidet, F., and Hu, R.

Subjects
MOLTEN salt reactors, HEAT convection, NUCLEAR reactor reactivity, NEUTRON transport theory, NUCLEAR reactor cores
Abstract

In recent years, there has been renewed interest in Molten Salter Reactors (MSRs) for their potential advantages compared to reactors that rely on solid fuel. In response to such interest, the System Analysis Module (SAM) was enhanced to include MSR-specific modeling features including a delayed neutron precursor drift model and a modified point kinetics model. This paper discusses the validation of these features using the experiments conducted in the Molten Salt Reactor Experiment (MSRE). These experiments include the pump start-up and coast-down tests at zero power and a thermal convection test. For the zero power tests, the change in pump speeds induces flow rate changes in the core that impact the precursor concentrations. This introduces a neutron imbalance and requires the adjustment of the control rods to counter-balance this effect. SAM was used to evaluate the precursor concentration in the core as a function of time, and the resulting changes in reactivity were evaluated through the modified point kinetics equation. The results show good agreement with the experimental data. It should be noted that the pump performance curve used in this analysis was re-constructed based on the initial water test data of the fuel pump. The steady-state pump curve is assumed to be applicable to transient flow operations. The thermal convection test was conducted by shutting off the pumps, reducing the inlet core temperature for 360 minutes, and allowing the power to be adjusted by the inherent feedbacks of the system. The power level during this transient was evaluated by SAM as a function of time. [ABSTRACT FROM AUTHOR]

Published
2021
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26. MULTIPHYSICS MODELING OF PRECURSORS IN MOLTEN SALT FAST REACTORS USING PROTEUS AND Nek5000.

Author

Margulis, M., Blaise, P., Feng, B., Fei, T., Shaver, D., Jung, Y., Fang, J., Rahaman, R., Lee, C., Smith, M., and Shemon, E.

Subjects
MOLTEN salt reactors, NUCLEAR reactors, COMPUTATIONAL fluid dynamics, NUCLEAR fission, NEUTRON transport theory
Abstract

The goal of this work was to calculate the impact of the delayed neutron precursor drift in fast spectrum Molten Salt Reactors (MSRs) using coupled solutions from the neutronics code PROTEUS and the computational fluid dynamics code Nek5000. Specifically, using a multiphysics approach to solve the effective delayed neutron fraction (βeff) or delayed neutron precursor distribution for reactors with flowing fuel salts would provide valuable information for transient simulations and safety assessments. Given the multiple options for the flux solution and geometric resolution/fidelity in PROTEUS, two approaches were developed and applied to various test cases: PROTEUS-NODAL/Nek5000 and PROTEUS-SN/Nek5000. For the former, the precursors are tracked in the built-in precursor drift model in PROTEUS-NODAL, whereas in the latter, Nek5000 directly tracks the precursors. Both approaches were used to solve a single test channel problem and showed excellent agreement in the calculated βeff. Separately, a 3D hourglass-shaped core was modeled using the PROTEUS-SN/Nek5000 approach. This problem was designed to demonstrate the capability of the discrete ordinates (SN) solver and Nek5000 to model complex core designs with axially varying geometries and the ability for Nek5000 to track the precursors and calculate the resulting βeff. In addition, the Nek5000 calculations revealed the presence of recirculation zones in the hourglass design, which could lead to significant temperatures in the fuel salt and surrounding materials. These first coupled solutions show why these approaches may be necessary for not only predicting the precursor drift effect in fast MSRs but also for reactor design and performance assessments. [ABSTRACT FROM AUTHOR]

Published
2021
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47. Recent Experiment Results during Electron Cyclotron Heating on HL-2A

Author

Dong, Y. B., primary, Liu, Yi, additional, Sun, H. J., additional, Zhou, Jun, additional, Xiao, W. W., additional, Chen, W., additional, Deng, W., additional, Yao, L. H., additional, Feng, B. B., additional, Rao, J., additional, Yang, Q. W., additional, Ding, X. T., additional, Liu, Yong, additional, Pan, C. H., additional, Varandas, Carlos, additional, and Sliva, Carlos, additional

Published
2008
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