Decay heat power in nuclear fuels of high - temperature reactors with spherical fuel elements ; documentation and illustration 带球状燃料元件的高温反应堆的核燃料衰变热力的计算
So it is very important for safety evaluation of in - pile fuel elements that we explore the thermal stability of fuel plates 因此，研究燃料元件的热稳定性，对掌握燃料元件的堆内行为和安全评价具有很重要的意义。
Deformation of fuel elements will change temperature field and the microstructures of material , which in turn will produce larger deformation and swelling than before , even damage fuel elements 芯体温度升高会导致材料组织结构的变化，以至产生更大的变形及肿胀，甚至会导致燃料元件失效。
In practical application , it is subjected to local plastic strain cycles due to the power fluctuations during reactor operation ; extremely , this power fluctuations could lead fatigue failure 在反应堆运行过程中，堆功率的波动和水冷却介质的流动会导致燃料元件包壳局部承受反复的循环变形，极端情况下会导致疲劳失效。
The effect of meat exposure on fuel element plates was small under normal conditions , but could not be neglected under off - normal conditions . fuel element plates should be thermally stable and could be used safely if operation temperature was below 250 实验结果表明，在400以下热循环，对燃料芯体及燃料板的性能没有显著影响，芯体暴露对燃料元件在正常运行温度下影响不大，但对事故工况下的影响不可忽视。
The paper describes the heat treatment at the temperature of 160 , 250 , 350 , 400 , 450 and 500 , the dimension change and microstructural evolution of miniature fuel element plates after heat treatment . the result reveals that : the fuel plates did not deform after 60 days at 160 and 250 , slightly curved after 60 days at 350 and 400 , and heavily curved after 20 days at 450 and so did after 1 day at 500 本论文介绍了微型燃料元件板(芯体u _ 3si _ 2 - al ，包壳为6061铝)的热稳定性实验研究，在160 、 250 、 350 、 400 、 450 、 500温度下经过一定的热循环，测定燃料板的变形，进行微观组织分析，结果表明：在160 400范围四个温度循环热处理60天后，燃料板厚度变化均小于0 . 03mm ，在前两个温度下，基本没有变形；在后两个温度下，燃料板稍有卷曲。
During the next decade , criticality safety is faced with many problems , such as storage of fissile material waste , depleted uranium application for criticality safety , regulatory improvement , experiments and benchmarks , burnup credit , dry storage of spent fuels , criticality safety calculations development , consensus on subcritical margins , etc 未来十年临界安全将面临含易裂变材料废物贮存、长期地质处置、系统临界安全分析、贫铀在临界安全中的利用、法规改进、临界安全实验与基准、燃耗信用的应用、乏燃料元件干法贮存、计算方法改进、次临界裕度的统一标准等问题。
