CARR寿期对控制棒价值的影响研究  

Study on the Influence of Cycle-life on the Control Rod Worth of China Advanced Research Reactor

作　　者：冉怀昌 朱吉印[1] 甄建霄 乔雅馨 RAN Huaichang;ZHU Jiyin;ZHEN Jianxiao;QIAO Yaxin(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《核科学与工程》2021年第2期236-240,共5页Nuclear Science and Engineering

摘　　要：以铪为吸收体的研究堆中,控制棒价值随着燃耗加深而减小。使用蒙特卡罗软件MVP-BURN建模计算在寿期内堆芯燃料组件的组成、控制棒中铪的成分随燃耗变化,使用MCNP计算程序计算不同寿期棒栅效率曲线。计算得到,控制棒价值与燃耗呈线性关系,在一个换料周期内吸收能力减少大约为1.4%。在同一个换料周期内,随着寿期进行,控制棒总价值逐渐增加。在寿期初,反应堆由于裂变毒物的影响,堆芯的剩余价值快速降低,控制棒总价值快速上升。中毒平衡后,随着燃耗加深,控制棒总价值随燃耗线性增加。控制棒价值的积分曲线随着寿期进行而趋于平缓,微分价值趋于更均匀。In the research reactor with Hf as the absorber,the control rod worth decreases with the increase of burnup.The composition of the fuel assembly in the core and hafnium in the control rod with burnup were calculated by Monte Carlo software MVPBURN.MCNP is used to calculate the control rod worth curves at different stages of cycle-life.There is a linear relationship between the loss of the control rod worth and burnup,and it is approximately 1.4%reduction in the absorption capacity in one refueling cycle.During the same refueling cycle,the total worth of the control rods increases gradually with the cycle-life.At the beginning of the cycle,the excess reactivity of the core decreases quickly because of the fission poison accumulation,which results in a sharp increase of the control rod worth.Then,the total worth of the control rods increases linearly with the burnup.The integral worth curve of the control rods becomes gentler with the development of its cycle-life and the differential worth is more uniform.

关 键 词：CARR 控制棒价值 寿期 蒙特卡罗方法 

分 类 号：TL345[核科学技术—核技术及应用]