"华龙一号"中子源位置设计研究
Study on the Neutron Source Location in HPR1000
林俊 1李先俊 1李志军 1包鹏飞 1何明涛 1王鑫1
作者信息
- 1. 中广核研究院有限公司,广东深圳 518026
- 折叠
摘要
反应堆启动中子源布置位置设计在关注堆外源量程探测器计数率大小的同时,也需要关注其对达临界过程中的倒计数率曲线变化特性的影响.本文通过OpenMC程序建立了精确的"华龙一号"首循环堆芯及堆外探测器响应计算模型,并通过防城港3号机组、某CPR1000机组首循环的实测数据对计算模型的精度进行了验证,而后计算了中子源布置在不同组件位置时,冷停堆状态下的探测器计数率的差异以及达临界过程中倒计数率曲线的变化特点.结果表明,当中子源布置在堆芯外围时,探测器的计数率会相对更大,同时达临界过程中的倒计数率曲线呈现出明显的外凸形状,随着中子源的布置逐步靠近堆芯中部,探测器的计数率逐步减小,达临界过程中的倒计数率曲线的形状会逐步由外凸向内凹转变.对于"华龙一号",在中子源强相对较高的情况下,将中子源布置在C12位置可以使得倒计数率曲线呈现出较好的线性度.本文中的计算模型可应用于各堆型的中子源位置设计,为工程设计中中子源位置的选择提供参考.
Abstract
The source range channel counting rate and the characteristic of inverse counting rate during initial criticality are two main factors concerned in the design of neutron source location.In this paper,the accurate core model for the calculation of source range detector response is built using the code OpenMC and is verified using measured data of the first cycle of Fangchenggang Unit 3 and the first cycle of CPR1000.The counting rate at cold shutdown and the characteristic of inverse counting rate with neutron source at diverse position are compared.The result shows that the counting rate increases as the neutron source approaches to the detector and the inverse counting rate curve tends to be more convex.When the neutron source approaches to the center of the core,the counting rate decreases and the inverse counting rate curve tends to be more concave.For HPR1000,with a relative high neutron source intensity,the neutron source can be placed at the C12 position for a better linearity of the inverse counting rate curve.The model described in this paper can be applied in simulation of source range channel response and provide reference for the neutron source location design of the diverse reactor.
关键词
HPR1000/达临界/源量程探测器/倒计数率Key words
HPR1000/Reach criticality/Source range detector/Inverse counting rate引用本文复制引用
出版年
2023
NETL
NSTL
万方数据