CAJ | 학술논문

燃料组件是反应堆的核心部分，在高温、高压及强中子辐射场等复杂环境条件下，燃料棒中芯块会出现肿胀、变形甚至包壳破裂，严重威胁反应堆的安全运行。为了更好地了解燃料组件在反应堆内的变化，研究高燃耗的燃料组件中燃料棒的中心空洞形成和燃料棒的变形情况，高能 X 射线无损检测是一种有效的技术手段。由于辐照后核燃料组件自身具有强放射性，探测系统设计中必须考虑减弱燃料组件自身辐射对探测采集的影响，因此组件探测系统中探测器阵列及准直器的优化设计十分必要。经过建模及相关模拟计算，得到了探测器单元最佳尺寸，优化了后准直器的结构设计，为提高燃料组件无损检测系统重建图像的质量提供帮助。
연료조건시반응퇴적핵심부분，재고온、고압급강중자복사장등복잡배경조건하，연료봉중심괴회출현종창、변형심지포각파렬，엄중위협반응퇴적안전운행。위료경호지료해연료조건재반응퇴내적변화，연구고연모적연료조건중연료봉적중심공동형성화연료봉적변형정황，고능 X 사선무손검측시일충유효적기술수단。유우복조후핵연료조건자신구유강방사성，탐측계통설계중필수고필감약연료조건자신복사대탐측채집적영향，인차조건탐측계통중탐측기진렬급준직기적우화설계십분필요。경과건모급상관모의계산，득도료탐측기단원최가척촌，우화료후준직기적결구설계，위제고연료조건무손검측계통중건도상적질량제공방조。
Fuel assemblies are the central components of a reactor.The core fuel pellets in the fuel pins will swell and deform and the fuel cladding may even break under the complex environment of high temperature,high pressure and intense neutron radiation field,which threats the safety of the reactor.To better understand the changes in the behavior of the fuel assembly in the reactor and study the central void formations and deformations of fuel pins in fuel assemblies to high burn-up,high-energy X-ray non-destructive testing is an effective technical means.Irradiated nuclear fuel assembly has a strong radioactivity,it is necessary to optimize the design of the detector system and the collimator to reduce the effect from gamma rays emitted from the irradiated fuel assem-bly during detection system designing phase.Through modeling,estimating and optimi-zation,the optimal size of the detector unit is obtained and the collimator design is opti-mized which can lay the foundation to improve the quality of the reconstructed images of the fuel assembly nondestructive system.