核电厂金属放射性表面激光去污数值模拟研究  

Numerical simulation study on laser decontamination of radioactive metal surface in nuclear power plants

作　　者：刘忠凯 李磊 阎丽静 LIU Zhong-kai;LI Lei;YAN Li-jing(China Nuclear Power Engineering Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]深圳中广核工程设计有限公司,广东深圳518000

出　　处：《激光与红外》2025年第1期52-59,共8页Laser & Infrared

摘　　要：本文对核电厂常用的不锈钢金属放射性表面的激光去污效果了数值模拟分析,研究结果显示,放射性部件去污是通过去除材料表面致密氧化层实现的。通过模拟金属材料双层结构和激光去污高斯热源,建立了激光去污有限元模型。分析结果表明,连续激光由于热累积效应明显,不适用于放射性表面去污。为评估去污有效性和适用性提出去污阈值和损伤阈值指标,在考虑去污效果的同时需保证基材不发生熔融。根据脉冲激光去污数值模拟研究,激光功率和扫描速度对烧蚀深度和基材温度影响基本呈线性关系,但在热累积效应增强过程中温度变化速率会上升,不同搭接率对去污表面形貌影响较大。In this paper,the effect of laser decontamination of the oxidized layer on the surface of stainless-steel metals commonly used in nuclear power plants is analyzed by numerical simulation,and the results show that decontamination of radioactive components is achieved by removing the dense oxidized layer on the surface of the material.A finite element model of laser decontamination is established by simulating the double-layer structure of the metal material and the Gaussian heat source of laser decontamination.The analytical results show that the continuous laser is not applicable to radioactive surface decontamination due to the obvious thermal accumulation effect.In order to evaluate the effectiveness and applicability of decontamination,the decontamination threshold and damage threshold indicators are proposed,and it is necessary to ensure that the substrate does not melt while considering the decontamination effect.According to the simulation study of pulsed laser decontamination,the effects of laser power and scanning speed on the ablation depth and substrate temperature are basically have a linear relationship on the ablation depth and temperature of the substrate,but the rate of temperature change increases during the enhancement of thermal cumulative effect,and the different lap rates have a greater impact on the decontamination surface morphology.

关 键 词：激光技术 放射性去污 数值模拟 激光参数 表面形貌 

分 类 号：TN249[电子电信—物理电子学] TL944[核科学技术—辐射防护及环境保护]