Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (5): 79 doi: 10.1007/s41365-019-0607-1

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Development of a displacement–reactivity feedback model for dynamic behavior simulation in Fast Burst Reactor

Jiang-Meng Wang1,2 • Hui Gao1,2 • Qi-Lin Xie1,2 • Xiao-Qiang Fan1,2 • Da-Zhi Qian1,2   

  1. 1 Key Laboratory of Neutron Physics, China Academy of Engineering Physics, Mianyang 621900, China
    2 Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2018-09-30 Revised:2018-12-17 Accepted:2018-12-22
  • Contact: Da-Zhi Qian E-mail:qdz1968@vip.sina.com
  • Supported by:
    This work was supported by a General Financial Grant from the China Postdoctoral Science Foundation (No. 2017M623313XB) and Key Laboratory of Neutron Physics, CAEP (No. 2018BA02).
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Jiang-Meng Wang, Hui Gao, Qi-Lin Xie, Xiao-Qiang Fan, Da-Zhi Qian. Development of a displacement–reactivity feedback model for dynamic behavior simulation in Fast Burst Reactor.Nuclear Science and Techniques, 2019, 30(5): 79     doi: 10.1007/s41365-019-0607-1
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Abstract: 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.

Key words: Displacement-reactivity feedback model, Prompt supercritical, Coupled calculation, Fast burst reactor