摘要：
The helical-coiled once-through steam generator (H-OTSG) has the advantages of compact structure and strong heat transfer ability, and is appropriate for lead-cooled fast reactor. The two-phase flow instability may cause mechanical vibration and thermal fatigue of heat transfer tube bundles, posing a serious threat to the safe operation of the H-OTSG. In this work, the secondary side of the H-OTSG characterized as multi-parallel channels is modeled by RELAP5/MOD3.4 code, and the oscillation behavior during start-up and the influence of structural and operating parameters on system stability are studied based on time-domain method. The results indicate that the pressure, flow rate, and temperature of the secondary fluid exhibit density wave oscillations at the heating section in a (n-2,2) pattern. In addition, increasing inlet throttling, reducing outlet throttling, controlling subcooling within an appropriate range and avoiding operation under low loads are all beneficial for improving the system stability of the helical-coiled once-through steam generator.
摘要：
Space nuclear power reactors have the advantages of small size, long service lives and high-power densities. As these characteristics, space nuclear power reactors can meet the high-power demands of spacecraft. To safely and reliably perform tasks in space with a space nuclear reactor, the control technology of the space nuclear reactor is significant. To study the core power control of a space nuclear reactor, a nonlinear model for the TOPAZ-II core is established by the lumped parameter method and principle of point reactor modeling. Then, directly based on the core nonlinear model, a fuzzy-PID controller is used to control the core power. Finally, the core power control system is built, and dynamic simulations are carried out with multiple transient conditions. The results show that the fuzzy-PID controller can realize core power control well, and its control effect is better than that of PID controller.
作者机构：
[徐士坤; 于涛; 谢金森; 刘金聚] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;Hunan Engineering & Technology Research Center for Virtual Nuclear Reactor, University of South China, Hengyang;[徐士坤; 于涛; 谢金森; 刘金聚] 421001, China <&wdkj&> Hunan Engineering & Technology Research Center for Virtual Nuclear Reactor, University of South China, Hengyang;[徐士坤; 于涛; 谢金森; 刘金聚] 421001, China
摘要：
不同可燃毒物的布置方式可以控制整个燃耗寿期下的反应性波动并且可以提高燃耗深度.本工作在不同富集度下分析可燃毒物的布置方式对堆芯反应性的影响.并对堆芯kef在整个燃耗寿期下的变化趋势进行分析.结果表明:1)含可燃毒物B和Gd的堆芯,采用16根可燃毒物棒的布置方式;含可燃毒物Er和Eu的堆芯,采用28根可燃毒物棒的布置方式;含可燃毒物231 P a、240 P u和241 Am的堆芯,采用组件燃料棒中均含可燃毒物的布置方式.2)在14％富集度下选用240 P u作为可燃毒物;在40％、70％和97％富集度下选用B作为可燃毒物.
作者机构：
[陈珍平; 于涛; 张震宇; 马辉强; 谢金森] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;[郭倩] School of Resource Environment and Safety Engineering, University of South China, Hengyang;Hunan Engineering and Technology Research Center for Virtual Nuclear Reactor, Hengyang;[陈珍平; 郭倩; 于涛; 张震宇; 马辉强; 谢金森] 421001, China<&wdkj&>Hunan Engineering and Technology Research Center for Virtual Nuclear Reactor, Hengyang
通讯机构：
School of Resource Environment and Safety Engineering, University of South China, Hengyang, China
期刊：
Nuclear Engineering and Design,2020年360:110513 ISSN：0029-5493
通讯作者：
Yu, Tao
作者机构：
[Zhu, Weicong; Hui, Tianyu; Zeng, Wenjie; Xie, Jinsen; Chen, Lezhi; Yu, Tao] Univ South China, Dept Nucl Sci & Technol, Hengyang City 421001, Peoples R China.
通讯机构：
[Yu, Tao] U;Univ South China, Dept Nucl Sci & Technol, Hengyang City 421001, Peoples R China.
关键词：
Electric control equipment;Fused salts;Model predictive control;Molten salt reactor;Particle swarm optimization (PSO);Power control;Proportional control systems;Three term control systems;Control strategies;IMC-PID;Internal model control;Molten salt breeder reactors;MSBR;Nuclear reactor control;Particle swarm optimization algorithm;Reactivity disturbance;Controllers
期刊：
Progress in Nuclear Energy,2020年121:103214 ISSN：0149-1970
通讯作者：
Yu, Tao
作者机构：
[Jiang, Qingfeng; Zeng, Wenjie; Xie, Jinsen; Yu, Tao] Univ South China, Dept Nucl Sci & Technol, Hengyang City 421001, Peoples R China.
通讯机构：
[Yu, Tao] U;Univ South China, Dept Nucl Sci & Technol, Hengyang City 421001, Peoples R China.
关键词：
Core outlet fuel temperature;Liquid molten salt reactor;Fuzzy PID controller;Load following operation
摘要：
As the molten salt fuel flows in the primary loop system of Liquid Molten Salt Reactor (LMSR), the core outlet fuel temperature can effectively characterize the core operation state. In this paper, a control strategy of the core outlet fuel temperature is designed based on the load power required. First, a nonlinear model of LMSR core is built by the lumped parameter method. Then, according to the relationship between the core outlet fuel temperature and the load power required, the control strategy of LMSR core outlet fuel temperature is established. The PID controller and the fuzzy PID controller are respectively used to design the core outlet fuel temperature control system. The simulation system is directly established by using the core nonlinear model. The simulation of LMSR core load following is carried out. The results show that the core outlet fuel temperature can be controlled well by using either PID controller or fuzzy PID controller.
作者机构：
[赵鹏程; 刘紫静; 于涛; 刘佩琪; 谢金森; 陈珍平] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu;610213, China;Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment, University of South China, Hengyang
作者机构：
[Zeng, Wenjie; 姜庆丰; 谢金森; 于涛] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment, University of South China, Hengyang;[Zeng, Wenjie; 谢金森; 于涛] 421001, China <&wdkj&> Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment, University of South China, Hengyang;[Zeng, Wenjie; 姜庆丰; 谢金森; 于涛] 421001, China
通讯机构：
School of Nuclear Science and Technology, University of South China, Hengyang, China
通讯机构：
[Yu, T.] S;School of Nuclear Science and Technology, China
关键词：
环形燃料芯块;温度场;稳态导热
摘要：
环形燃料芯块(Annular Fuel Pellets)具有较低的运行温度,能够实现更高的功率密度,已成为先进核反应堆燃料元件的发展方向之一。由于双面冷却环形元件存在流量分配和热量分配问题,实心圆柱燃料芯块的温度场求解方法无法求解环形燃料芯块温度场。建立了环形燃料芯块一维稳态温度场计算模型,开发了环形燃料芯块温度场计算程序PTFA(Program of Temperature Field of Annular Fuel Pellets),并计算了不同功率密度、不同芯块厚度下的绝热面位置、最高温度以及芯块的温度场分布。最后用有限元程序COMSOL5.4验证了不同芯块厚度下不同功率密度的环形燃料芯块的绝热面位置、最高温度以及芯块温度场分布。结果表明:环形燃料芯块一维稳态温度场计算模型计算的结果与有限元方法计算的结果吻合很好,相对偏差小于0.2%,该模型可以用于环形燃料元件的热工水力计算分析。
期刊：
Progress in Nuclear Energy,2020年125:103390 ISSN：0149-1970
通讯作者：
Yu, Tao
作者机构：
[Hui, Tianyu; Zeng, Wenjie; Xie, Jinsen; Yu, Tao] Univ South China, Sch Nucl Sci & Technol, Hengyang City 421001, Peoples R China.
通讯机构：
[Yu, Tao] U;Univ South China, Sch Nucl Sci & Technol, Hengyang City 421001, Peoples R China.
关键词：
China Initiative accelerator driven system;Core power control;Duty ratio of a proton beam;Dynamic simulation
摘要：
The China Initiative Accelerator Driven System (CIADS) subcritical reactor uses a superconducting proton linear accelerator to form a periodic pulsed proton beam, which excites the periodic external neutron source to realize core operation. To study the influence of the periodic pulsed proton beam on the power control of the core, a lumped parameter method is used to establish a nonlinear model of the reactor core, which is then transformed into a linear model. Considering the periodic nature of the pulsed proton beam, the duty ratio of the proton beam is introduced to represent the duration of excitation of the pulsed neutron source in a single period. To study the influence of the periodic proton beam on the core power and propose a control strategy, a CIADS core power simulation system is designed and established based on a proportional-integral-derivative (PID) controller. The results show that the duty ratio and amplitude play an important role in the changes in the core power. Under regulation by the PID controller, different duty ratios and amplitudes of the periodic beam can be used to achieve core power control.
