浅层模型(SLAB)用于UF_6泄漏事故后果评价适用性初步研究

Preliminarily Study on Applicability of UF_6 Leakage Accident Assessment by Shallow Model

根据重气扩散模型中的浅层模型(SLAB)理论,结合HGSYSTEM/UF6模型中UF6及其产物在空气中的化学反应和热动力学特性的相关处理方法,构建UF6泄漏近源场扩散模型,并利用法国波尔多国家试验基地的两次UF6释放试验数据,对构建模型做初步研究和验证。结论为:构建模型的模拟结果接近真实测量值,模拟值与测量值的比值(P/O)在1.0~2.4范围内,模拟结果的误差在可接受范围内;初步证明构建模型能较好的模拟UF6泄漏后在近源场扩散迁移情况,是UF6泄漏事故近源场后果评价可供改进的模型。

The purpose of this article is to use SLAB model and HGSYSTEM / UF6 model,to build the near source field evaluation model after UF6 leakage accidents. And based on the data of three UF6 release experiments carried by the French Bordeaux National Experimental Base,it tested the model preliminarily. It turned out that the model can simulate atmospheric diffusion and migration in the near source field after UF6 leakage very well( P / O = 1. 0—2. 4),the simulation results errors are acceptable.It also aims to provide theory basis for the later large model program development,and offer help for more precision simulation of contaminants transfer after UF6 leakage accidents.