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Development of a displacement-reactivity feedback model for dynamic behavior simulation in fast burst reactor

Nuclear Science and Techniques 2019年第5期30卷 82-91页

作者： Jiang-Meng Wang Hui Gao Qi-Lin Xie Xiao-Qiang Fan Da-Zhi Qian Key Laboratory of Neutron Physics China Academy of Engineering Physics Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics

In this study, a displacement-reactivity feedback model, which can directly represent the inherent ‘‘thermal expansion extinction effect'' of fast burst reactors(FBRs),was developed with the aid of the static neutron transport component of the FBR-MPC code. Dynamic behaviors of bursts in the Godiva I reactor were simulated by coupling the simplified multiphysics models consisting of the point kinetic equations for neutronics, adiabatic equation for temperature, and thermoelastic equations for displacement/stress with the developed model. The results were compared with the corresponding experimental data and those obtained using the traditional fission yield(temperature rise)-reactivity feedback models. It was found that the developed model can provide good results for the bursts with no or a small inertia effect. For the bursts with a prominent inertia effect, the smaller burst width and asymmetric distribution of the fission rate curve, noticed in the experiments but not evident using the traditional models, can be reproduced. In addition, the realistic oscillations in reactivity and fission rate caused by the core vibration, as well as the deeper sub-prompt criticality in the plateau following the burst, can be observed. Therefore, the developed displacement-reactivity feedback model can be expected to be an effective tool for calculating the dynamic behaviors of bursts.

关键词： displacement-reactivity feedback model Prompt supercritical Coupled calculation Fast burst reactor

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