核燃料元件中子照相无损检测专用转移容器的优化设计  

Optimized design of the nuclear fuel rod transport container used for non-destructive testing with neutron radiography

作　　者：魏国海[1] 韩松柏[1] 贺林峰[1] 王雨[1] 王洪立[1] 刘蕴韬[1] 陈东风[1] 赵志祥[1] 

机构地区：[1]中国原子能科学研究院中子散射实验室,北京102413

出　　处：《核技术》2014年第6期77-81,共5页Nuclear Techniques

基　　金：国家重点基础研究发展(973)计划(No.2010CB833106);国家自然基金委面上项目(No.11375271);中国原子能科学研究院院长基金-青年英才培育基金(No.16YC-201302;No.16YC-201303)资助

摘　　要：核燃料元件作为反应堆的核心部件,在极端的条件下服役会发生破损,导致核泄漏。为了保障反应堆安全运行,核燃料元件从加工、生产到服役的过程中必须进行检测,以确保安全。中子照相是对具有放射性的核燃料元件进行无损检测的独特技术。进行测试时,核燃料元件必须放置于转移容器中,实现运输及检测过程中对核燃料元件的屏蔽和运动控制。本文以核电站绿色监督区剂量要求为标准,利用蒙特卡罗程序优化计算了适合于中国先进研究堆(Chinese Advanced Research Reactor,CARR)热中子照相设备的转移容器的材料及尺寸,同时设计了用于控制元件运动的机械装置,确定了最优化的方案。该装置可满足CARR中子照相设备对长2 m核燃料元件进行无损检测的要求。Background： Working under extreme conditions, nuclear fuel rods, the key component of nuclear plants and reactors, are easy to be broken. In order to be safe in operation, lots of testing methods on the fuel rods have to be carried out from fabrication to operation. Purpose： Neutron radiography is a unique non-destructive testing technique which can be used to test samples with radioactivity. As the essential equipment, the nuclear fuel rod transport container has to shield the radioactivity of fuel rod and control its movement during testing and transporting. Methods： The shielding simulation of the transport container was performed using the MCNP4C code, which is a general purpose Monte Carlo code for calculating the time dependent multi-group energy transport equation for neutrons, photons and electrons in three dimensional geometries. Results： The material and dimension of the transport container used for neutron radiography testing fuel rods at Chinese Advanced Research Reactor （CARR） were optimally designed by MCNP, and the mechanical devices used to control fuel rods＇ movement were also described. Conclusion： The 2-m long fuel rod can be tested at CARR＇s neutron radiography facility （under construction） with this transport container.

关 键 词：无损检测 中子照相 核燃料元件 转移容器 

分 类 号：TL37[核科学技术—核技术及应用]