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Development and validation of an agglomeration model for CFD simulations of aerosol dispersion in the frame of Fukushima fuel debris retrieval
Journal of Nuclear Science and Technology ( IF 1.2 ) Pub Date : 2021-01-18 , DOI: 10.1080/00223131.2020.1862717
Thomas Gélain 1 , Emmanuel Porcheron 1 , Christophe Chagnot 2 , Ioana Doyen 2 , Christophe Journeau 3 , Damien Roulet 4
Affiliation  

ABSTRACT

This article is devoted to demonstrate the feasibility of laser cutting technique for the fuel debris retrieval into the Fukushima Daiichi damaged reactors. IRSN is involved in a project led by ONET Technologies, in collaboration with CEA, to evaluate the risk occurred by the dispersion of aerosols emitted by the dismantling operations [4]. During the laser cutting operations of fuel debris in air condition, particles will be produced, inducing a potential risk of dispersion into the environment. Hence, evaluating the fate of these particles after their emission is one of the safety key issues for these dismantling operations. In this objective, IRSN performed CFD simulations of dispersion of particles representative of inactive fuel debris simulants (1)(2)(3)(4). The first numerical results (5) showed a quite good agreement but some improvements were needed to take into account complex particle size distributions (PSD). Consequently, this article proposes an alternative method to better initialize the agglomeration calculation, in order to take account for different kinds of particle size distribution in the CFD simulations and to better evaluate the fate of aerosols produced by the debris cutting in the damaged reactors of Fukushima-Daiichi pedestal.



中文翻译:

福岛燃料碎片回收框架内CFD模拟气溶胶弥散的集聚模型的开发和验证

摘要

本文致力于展示激光切割技术将燃料碎片回收到福岛第一核电站受损反应堆中的可行性。IRSN参与了由ONET Technologies与CEA合作领导的一个项目,以评估拆除操作所散发的气溶胶扩散所产生的风险[4]。在空气条件下对燃料残渣进行激光切割操作期间,会产生颗粒,从而导致散布到环境中的潜在风险。因此,评估这些颗粒排放后的命运是这些拆卸操作的安全关键问题之一。为此,IRSN对代表惰性燃料残渣模拟物(1)(2)(3)(4)的颗粒分散进行了CFD模拟。最初的数值结果(5)显示出很好的一致性,但是需要一些改进来考虑复杂的粒度分布(PSD)。因此,本文提出了另一种方法,以更好地初始化团聚计算,以便在CFD模拟中考虑不同种类的粒径分布,并更好地评估由福岛受损反应堆中的碎屑切割产生的气溶胶的去向​​。 -Daiichi基座。

更新日期:2021-01-18
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