摘要
为检测燃料棒内的氦气压力值,目前采用的破坏性穿刺法经济性不佳,且无法对每根燃料棒进行检测。为此,引入无损检测设备实现燃料棒内氦压无损测量。为验证无损检测设备的可靠性,进行了以下实验:选择三种不同氦压值的标准棒,先用实验燃料棒分别做传热法与穿刺测压法的结果对比,然后使用控制变量法,分别控制燃料棒自身温度、单次测量的时间间隔、环境温度,确定无损检测方法有无其他影响因素。实验结果表明:无损检测设备测量标准棒时,在24~30℃下与穿刺测压法的所得结果基本一致,测量值的偏差不超过0.05 MPa,满足氦压测量的精度要求。同一支标准棒或燃料棒重复测量的时间间隔需≥2 min。燃料棒氦压无损检方法具有可靠性,不同环境下测量结果也具有稳定性。
[Background]Currently,the destructive puncture manometry method is used to measure helium pressure inside fuel rods.However,this method is expensive and does not guarantee 100%coverage.Hence the non-destructive testing(NDT)equipment is introduced for non-destructive measurement of helium pressure inside fuel rods.[Purpose]This study aims to analyze the reliability of NDT testing method for the measurement of helium pressure inside fuel rods.[Methods]Three standard rods with helium pressure values of 0.98 MPa,1.76 MPa,2.45 MPa,respectively,were selected for experimental test.The experimental fuel rods were first used to obtain the results comparison of heat transfer method and puncture manometry,then the control variates were employed to control the fuel rod temperature,the time interval of a single measurement,and the ambient temperature respectively,so as to determine influencing factors in the NDT method.Finally,reliability analysis of NDT method was performed according to experimental results.[Results]The results of the NDT method are consistent with that of the puncture manometry method at a temperature range of 24~30ºC with less than 0.05 MPa deviation.Minimum repeat measurement time interval for NDT measuring helium pressure of the same standard rod or fuel rod is 2 min.[Conclusions]The NDT method for measuring the helium pressure of fuel rods is reliable,and the measurement results are stable in different environmental conditions.
作者
黄帆
朱浙楠
曹晖
于文昕
蒙笑缘
HUANG Fan;ZHU Zhenan;CAO Hui;YU Wenxin;MENG Xiaoyuan(CNNC Nuclear Fuel Components Co.,Ltd.,Yibin 644000,China)
出处
《核技术》
CAS
CSCD
北大核心
2023年第7期136-144,共9页
Nuclear Techniques
关键词
燃料棒
氦压
无损检测
穿刺测压
可靠性
Fuel rods
Helium pressure
Non-destructive testing
Puncture manometry
Reliability
