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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。
As a core component of a nuclear reactor, nuclear fuel components can break down in service under extreme conditions and lead to nuclear leaks. In order to ensure the safe operation of the reactor, nuclear fuel elements must be inspected during processing, production and service to ensure safety. Neutron photography is a unique technique for non-destructive testing of radioactive nuclear fuel elements. For testing, the nuclear fuel element must be placed in a transfer vessel to provide shielding and movement control of the nuclear fuel element during transport and inspection. In this paper, based on the dose requirements of the green supervision area of nuclear power station, the material and the size of the transfer vessel suitable for the Chinese Advanced Research Reactor (CARR) thermal neutron photographic equipment are optimized and calculated by using the Monte Carlo program. At the same time, The mechanical device that controls the movement of the element determines the optimum solution. The device meets the requirements of CARR neutron radiographic equipment for non-destructive testing of long 2 m nuclear fuel elements.