基于欧拉方法的核素近海迁移计算  

Research on Radionuclide Migration in CoastalWaters Based on Euler Method

作　　者：李子超[1] 周涛 司广成[3] 秦雪猛 LI Zichao;ZHOU Tao;SI Guangcheng;QIN Xuemeng(School of Nuclear Science and Engineering,North China Electric Power University,Beijing,102206,China;Southeast University School of Energy and Environment,Nanjing of Jiangsu Prov.211096,China;Institute of Oceanology,Chinese Academy of Sciences,Qingdao of Shuandong Prow.266071,China)

机构地区：[1]华北电力大学核科学与工程学院,北京102206 [2]东南大学能源与环境学院,江苏南京211096 [3]中国科学院海洋研究所,山东青岛266071

出　　处：《核科学与工程》2020年第2期256-263,共8页Nuclear Science and Engineering

基　　金：国家重点研发计划:核电站泄漏放射性核素在邻近海域的动态迁移和衰减规律研究(2016YFC1402501)。

摘　　要：研究放射性核素在近海的迁移扩散规律,对核电厂事故条件下应急决策及事故缓解有重要作用。基于AP1000机组,选择气候态平均的边界条件,建立了中国近海水动力模型;然后基于六小时预报的气象数据,建立了核电厂近海域水动力模型;最后基于欧拉的方法,建立了核素扩散模型;对模型进行了验证,分析了核泄漏事故后,核素在核电厂近海域的迁移规律。结果表明:核电厂近海域的水动力模型较好地刻画了核电厂附近海域的流场,模拟水位与海床基实测水位差控制在10 cm之内;131 I在核电站近海域的迁移方向与137 Cs基本一致,都是沿着海岸线向东迁移,同时向南扩散;对于核事故应急响应,半衰期较长的核素137 Cs可以不考虑衰变对其放射性活度的影响;半衰期较短的核素131 I,衰变对其放射性活度的影响很大。The study of radionuclide migration and diffusion in coastal waters plays an important role in emergency decision and accident mitigation under accident conditions of nuclear power plants.According to AP1000,the hydrodynamic model in coastal waters of China was established by choosing the average condition of climate.Then the hydrodynamic model in coastal waters of the nuclear power plant was established based on the six-hour forecast meteorological data.Finally,a radionuclide diffusion model was established based on Euler method.The model is validated and the radionuclide migration in coastal waters of nuclear power plant under nuclear leakage accident was analyzed.The results show that the hydrodynamic model in coastal waters of the nuclear power plant can well depict the flow field,and the difference between the simulated and measured water level is within 10 cm.Both 131 I and 137 Cs migrate from nuclear power plant to northeast along the coastline and spread to the south region at the same time.With emergency response to nuclear accidents,the decay effect to radioactivity can be neglected for 137 Cs with its long half-life.The decay of 131 I has a great influence on radioactivity for its short half-life.

关 键 词：核泄漏事故 欧拉方法 核素 近海域 扩散 

分 类 号：TL732[核科学技术—辐射防护及环境保护]