安全壳整体性试验过程壳内气体状态仿真分析

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中图分类号：TM623；TU317 文献标志码：A DOI： 10.15935/j.cnki.jggcs.20250627.001

AbstractRegarding the evaluationof physical state change of the gas inside the containment vessel caused by theincrease in the pressurization rate during the integrity test of the containment vessel，based on the computational fluid dynamics analysis method，a detailed simulation analysis model of the fluid domain inside thecontainment vessel was first established.Then，thereliability of the model was verified using historical data from the integrity testof the containment vessel.Based on the validated model，an analysis is conducted on the gas movement inside the containment after increasing the pressurization rate to 45kPa/h . The results show that the gas inside the containment generally flows slowly，with a maximum average gas velocity of only （20 0.245m/s . The temperature of the gas inside the containment exhibits a non-linear change.The average temperature of the gas inside the containment is increased by 12.85K .During the pressurization process， the gas pressure inside the containment is generally evenly distributed，and except for a range of 1.8 meters near the pressurization port， the pressure gradient in all other areas does not exceed 5Pa

Keywordscontainment，pressurization rate，state of gases，computational fluid dynamics （CFD）

0 引言

安全壳结构是核反应堆的最后一道物理屏障，由预应力混凝土结构与多重密封系统组成，在核电厂全生命周期内起着包容放射性物质外泄的核心防护作用，其完整性直接决定了整个核能发电系统的安全性[1。（剩余7865字）