Seismic behavior analysis of control rod dropping by vector form Intrinsic Finite-Element method

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Design Pub Date : 2024-11-06 DOI:10.1016/j.nucengdes.2024.113660

Han Wu , Qing Peng , Fenglei Jin , Jingru Song , Xiaoming Liu

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引用次数: 0

Abstract

Control rod drive mechanism (CDRM) play a major role in ensuring safe operation of nuclear reactor during the earthquake, under which the dropping time of control rod is crucial for safe shutdown. Under the earthquake, Rod Cluster Control Assembly (RCCA) has contact collision with the guide tube, resulting in an increase of friction and a decrease of the speed of the falling rod. In addition, in view of the slender structure of the falling rod, the flexible deformation vibration will occur under the impact excitation, which will aggravate the collision and friction. In order to solve the nonlinear problem caused by contact collision between control rod and guide tube, we proposed a dynamic behavior analysis program of rod dropping based on vector finite element method. In order to simulate contact collision force more accurately, we proposed a conformal contact law to simulate the contact force between control rod and guide tube. The vector finite element model and simulation program are validated by comparing with a rod drop experiment. Based on the developed program, the rod dropping behavior, including rod dropping time, contact force, friction force and control rod deformation under several earthquake condition were discussed in this work.

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用矢量形式本构有限元法分析控制棒垂落的地震行为

控制棒驱动机构（CDRM）在地震中对确保核反应堆的安全运行起着重要作用，在地震中控制棒的下落时间对安全关堆至关重要。地震时，控制棒簇控制组件（RCCA）与导向管发生接触碰撞，导致摩擦力增大，控制棒下降速度降低。此外，由于落杆结构细长，在冲击激励下会产生柔性变形振动，加剧碰撞和摩擦。为了解决控制杆与导向管接触碰撞引起的非线性问题，我们提出了基于矢量有限元法的落杆动态行为分析程序。为了更精确地模拟接触碰撞力，我们提出了保角接触定律来模拟控制杆和导向管之间的接触力。我们将矢量有限元模型和模拟程序与落杆实验进行了对比验证。基于所开发的程序，本文讨论了几种地震条件下的控制棒下落行为，包括控制棒下落时间、接触力、摩擦力和控制棒变形。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.