A loss of vacuum accident is one of the possible phenomena that may be triggered by off-normal events in nuclear fusion reactors, such as disruptions. After a break of the isolation system and the formation of a penetration line, the air flows inside the Tokamak due to the large pressure gradient, resuspending toxic and radioactive dust. At the end of the event, an over pressurisation of the vacuum vessel may occur due to inertia effects and the heating of the air through the first wall, that may have still high temperatures. Thus, air will flow from the inside to the outside, dragging the dust particles and involving a radiological and toxic release. This work aims to provide, by numerical simulations, an analysis of particle release as a function of main parameters that characterise the release: diameter of the penetration line, wall temperature and particle sizes. The numerical simulation is based in a one-way coupling. Starting from the simulation of the velocity, pressure and density fields of the continuous phase(air) by a monophasic compressible CFD model, the motion of the particles inside the vessel is simulated.

真空损失事故是核聚变反应堆中异常事件（例如中断）可能触发的可能现象之一。在隔离系统破裂并形成穿透线后，由于压力梯度大，空气在托卡马克内部流动，重新悬浮有毒和放射性尘埃。在事件结束时，由于惯性效应和通过第一壁的空气的加热，真空容器可能会过压，而第一壁的温度可能仍然很高。因此，空气将从内部流到外部，从而拖曳灰尘颗粒并涉及放射和有毒物质的释放。这项工作旨在通过数值模拟提供对颗粒释放的分析，该分析是表征释放的主要参数的函数：穿透线的直径，壁温和粒径。数值模拟基于单向耦合。从通过单相可压缩CFD模型模拟连续相（空气）的速度，压力和密度场开始，对容器内部粒子的运动进行了模拟。