On the nature of aerosols produced during a severe accident of a water-cooled nuclear reactor
On the nature of aerosols produced during a severe accident of a water-cooled nuclear reactor
复制标题
DOI：
10.1016/j.nucengdes.2008.06.003
复制
发表时间：
2008-10-01
影响因子：
1.7
通讯作者：
Kissane, M. P.
中科院分区：
文献类型：
--
作者：
Kissane, M. P.
粒子行为强烈依赖于经典特性，例如，尺寸，以及涉及结构和组成的不太宏观的因素，这些因素在颗粒上的强差外力的情况下特别重要，即，表面冲击或强烈剪切流。前一种情况可能导致颗粒沉积或破碎和再次夹带（具有潜在的事故管理影响）。本文回顾了气溶胶的原型实验，确定共同的特点和典型的变化的信息。由此可见，由三分之一的金属、三分之一的金属氧化物和三分之一的裂变产物混合物组成的粒子在任何潜在的反应堆事故序列中都不会出现。颗粒形状看起来相对紧凑，没有分支链状结构。在尺寸和结构上，在初级回路的上游部分的气溶胶将包括一个近似对数正态分布的群体，AMMD不超过2 μ m，几何标准偏差约为2，颗粒包括小至0.1 μ m的高度协调的簇的聚集体。在安全壳中，气溶胶通常可以由一次回路颗粒及其团聚物表示，尽管特定情况（堆芯-混凝土相互作用、热段事故序列）可能会改变这一简单的画面。(C)2008 Elsevier B. V.保留所有权利。
Particle behaviour depends strongly on classic characteristics, e.g., size, and less macroscopic ones involving structure and composition these being especially important in situations of strong differential forces on a particle, i.e., surface impact or intensely-shearing flows. The former situation may lead to particle deposition or break-up and re-entrainment (with potential accident-management implications). This paper reviews information on aerosols from prototypical experiments identifying common features and typical variations. It emerges that a particle comprising one-third metal, one-third metal oxide and one-third a mixture of fission-product species would not be out of place in any potential reactor-accident sequence. Particle shapes appear relatively compact without branching chain-like structures. On size and structure, aerosols in the upstream part of the primary circuit would comprise a near-lognormal population with AMMD no more than 2 mu m and geometric standard deviation around 2, particles comprising agglomerates of highly-coordinated clusters as small as 0.1 mu m. In the containment, aerosols can typically be represented by primary-circuit particles and their agglomerates though particular circumstances (core-concrete interaction, hot-leg accident sequence) can alter this simple picture. (C) 2008 Elsevier B.V. All rights reserved.