研究堆内材料释热率测量装置研制

为了探究材料释热率在研究堆孔道内的轴向分布规律，以高通量工程试验堆（HFETR）G7孔道为例，设计一种材料释热率测量装置。通过数值模拟方法得到释热率测量装置及试验段在载荷作用下的应变分布云图，采用物理计算得到量热计校对桥和测量桥的温度参数，并利用本装置在G7孔道开展释热率测量试验。结果表明，该装置整体结构满足强度要求，试验段量热计之间需加装保护管；计算得出样品、校对桥和测量桥的温度低于材料熔点，装置满足热工要求；试验测得的释热率值随堆功率变化规律性强，且不同材料在不同能量等级的γ射线环境下，对γ的吸收性是有区别的。因此，本装置可以作为HFETR释热率测量工具，为确定不同材料在堆内释热率分布情况提供保障。 

Development of Device for Measuring the Heat Generation Rate of Materials in Research Reactor

To explore the axial distribution of the heat generation rate of the materials in the channels of the test reactor, a heat generation rate measuring device was designed, by taking the G7 channel of the high flux engineering test reactor (HFETR) as an example. The strain distribution contours of the device and test section under load are obtained by numerical simulation method, and the temperatures of the calorimeter to calibrate the bridge and the measurement bridge are obtained by physical calculation. The heat generation rate measurement is carried out in the G7 channel using this test device. The results show that the overall structure of the device meets the strength requirements, and a protective tube needs to be installed between the calorimeters in the test section. The calculated temperature of the sample and the bridge is lower than the melting point of the material, and the device meets the thermal requirements. The heat generation rate measured by the test varies with the reactor power changes regularly. Different materials have different γ absorption properties under different energy levels of γ-ray environment. The device can be used as a heat generation rate measurement tool to provide a guarantee for determining the heat generation rate distribution of different materials in the nuclear reactor.