Study of Control rod worth in the TMSR
ZHOU Xuemei* LIU Guimin
【摘 要】Abstract Control rod is a primary control part of emergency control and power regulation in nuclear reactor. The main application of it is to control fast change of the reactivity. The theoretical analysis for the worth of control rod is necessary in the stage of design. Based on design requirements, some results are calculated. Firstly, control rod worth with different density of neutron absorber is calculated by MCNP here. Secondly, the study of integral and differential control rod worth is presented in this paper while the control rod is inserted into reactor core and total worth of three rods with different positions are also calculated. Finally, the effect of the axial and radial neutron flux in reactor core which is caused by the control rods is simulated. The simulation results of the control rods meet design requirements for TMSR.【期刊名称】核技术（英文版）【年(卷),期】2013(024)001【总页数】5
【关键词】Key words Neutron absorber, Reactivity, Control rod worth, Neutron flux
1 Introduction
The abbreviation of thorium molten salt reactor is TMSR. The TMSR is the first start implementing strategic guide for technology special in the Chinese Academy of Sciences. Control rod is an important control part of the reactivity in TMSR. Due to the high
importance of the control rods’ reactivity worth, methods for its measurement have been proposed by Shimazu[1]. Many efforts have been made for the choice of the right absorber materials by Saji[2], tested also with calculations. Control rod worth calculations have also been reported by Bretscher[3] for best simulation method. The features of control rod are summarized: fast movement speed, reliable operation, flexible use and high accuracy for the control of reactivity[4]. The worth of one and multiple control rods for the TMSR is calculated in this paper, and that the control rod worth with different density of neutron absorber is shown. In addition, the integral and differential control rod worth is presented, finally, the effect of the axial and radial neutron flux in reactor core which is induced by control rods is also analyzed.
2 Position, structure and size of control rod in the TMSR
Study of Control rod worth in the TMSR
