燃料试样堆内辐照温度设计与实验研究  

Design and Experimental Study of Irradiation Temperature in Fuel Specimen

作　　者：杨文华[1] 张亮[1] 斯俊平 聂良兵[1] 童明炎[1] Yang Wenhua;Zhang Liang;Si Junping;Nie Liangbing;Tong Mingyan(Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]中国核动力研究设计院

出　　处：《核动力工程》2018年第6期43-48,共6页Nuclear Power Engineering

摘　　要：为使燃料尽可能在最恶劣设计工况下进行辐照实验,开展基于高通量工程试验堆(HFETR)的燃料试样堆内辐照温度设计与实验研究。按照铀装量设计燃料试样在辐照装置内的位置,能够改善轴向燃料试样热流密度的不均匀性。HFETR主冷却剂低温状态下,在燃料试样外包覆液态铅铋合金和不锈钢能够实现燃料芯体及燃料包壳的高辐照温度指标。设计和实验结果表明,稳态和短期瞬态运行工况下,不锈钢盒表面辐照温度始终低于HFETR燃料元件包壳表面最高温度限值,满足反应堆运行和燃料辐照实验安全要求。为提高稳态运行工况下燃料试样的辐照温度,堆芯设计时应避免或降低由于反应性扰动造成的辐照装置内燃料试样短期瞬态功率影响,减小辐照孔道内燃料试样的热点因子。An investigation on the irradiation temperature and irradiation test of fuel specimens was performed in the High Flux Engineering Test Reactor(HFETR), for conducting fuel irradiation test in the worst design condition. The test results show that the axial factor of heat flux density on fuel specimen surface can be decreased by adjusting the fuel specimen locations in the irradiation rig with its uranium content. A high irradiation temperature level of fuel meat and fuel cladding in the fuel specimens was obtained by coating the fuel specimens with a layer of liquid lead-bismuth alloy and a stainless steel container, while the specimens were cooled with a rather low temperature coolant of HFETR. The test results show that the stainless steel surface temperature is lower than the limit of maximum cladding surface temperature of the HFETR fuel element under the steady state condition or a short-term transient operation condition, satisfying the requirements of reactor operation and fuel irradiation test. To decrease the peak factor of fuel specimen temperature in the irradiation channel and then to increase its irradiation temperature under the steady state operation condition, the short-term transient power variation of fuel specimens caused by the reactivity disturbance in the irradiation rig should be avoided or reduced by optimizing the core arrangement design and reactor operation plan.

关 键 词：燃料试样 辐照实验 辐照温度 高通量工程试验堆(HFETR) 

分 类 号：TL333[核科学技术—核技术及应用]