https://doi.org/10.1051/epjconf/202430212002
Time Dependent Energy Deposition Model in RMC Kinetics Calculation
1 Institute of Nuclear and New Energy Technology, Tsinghua University
2 Department of Engineering Physics, Tsinghua University
* Corresponding author: luo-hao@mail.tsinghua.edu.cn
Published online: 15 October 2024
Calculating or predicting the energy deposition in the reactor is an important task for reactor design and safety analysis. Rigorous energy deposition estimation is a difficult task because of the energy dependence, spatial dependence, and time dependence of in-core nuclear heating. This paper develops a time-dependent energy deposition model in the RMC kinetics calculation to explicitly account for the time-delay effect of delayed in-core nuclear heating. An explicit sampling method (ESM) is proposed to sample the decay time of the delayed photon and beta precursors based on a new precursor library processed from the ENDF/B-VIII.0 library. The new model is verified by comparing it with the typical equilibrium model using the Godiva experiment and the C5G7- TD benchmark. Maximum 2.5% and 5.4% relative deviations are observed in GODIVA and C5G7-TD cases respectively, which indicates that the equilibrium model underestimates the energy deposition over the transient time. The analysis of the energy deposition results demonstrates that the new model can provide more precise energy deposition estimation in the transient calculation.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
