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Measurement of Type 304L Stainless Steel and 16MND5 Ferritic Steel Density and Surface Tension: Possible Impact for Stratified Molten Pool

机译:304L不锈钢和16MND5铁素体钢的密度和表面张力的测量:对分层熔池的可能影响

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摘要

In-vessel retention (IVR) is an attractive strategy to mitigate a severe accident. However, because of low margins, it remains questionable for reactors of power of 1000 MW(electric) and higher. The success of the IVR strategy mainly depends on the mechanical behavior of the vessel after being ablated and on the inner thermal load, i.e., the heat flux transferred by the molten pool to the vessel, which has to remain lower than the critical heat flux. In some configurations, the stratification of the molten pool may lead to heat flux concentration in the thermal conductive metallic layer. An understanding of the metal layer behavior is fundamental in order to estimate the inner thermal load and requires knowing the liquid-metal physical properties, such as density and surface tension. In the present paper, original data of vessel thermophysical properties are proposed for the first time. Measurements of Type 304L stainless steel and 16MND5 ferritic steel density and surface tension have been made using the sessile drop method. Samples have been melted to form a drop on a yttria-stabilized zirconia substrate and heated up to 200 degrees C above the melting point. Low Bond Axisymmetric Drop Shape Analysis has been used to estimate the sample density and surface tension and to propose correlations for the density and surface tension as a function of temperature. The influence of steel properties on metal layer cooling has been discussed. Especially, the sign of the metal temperature surface tension coefficient d sigma/dT was found to be most likely positive. In this case, the Benard-Marangoni flow is opposite to the Rayleigh-Benard convection flow.
机译:船内滞留(IVR)是减轻严重事故的一种有吸引力的策略。但是,由于利润率低,对于功率为1000兆瓦(电)或更高的电抗器仍然存在疑问。 IVR策略的成功主要取决于烧蚀后容器的机械性能以及内部热负荷,即由熔池传递至容器的热通量,其必须保持低于临界热通量。在一些配置中,熔池的分层可导致导热金属层中的热通量集中。为了估计内部热负荷,必须了解金属层的行为,并且需要了解液体金属的物理特性,例如密度和表面张力。本文首次提出了容器热物理性质的原始数据。 304L不锈钢和16MND5铁素体钢的密度和表面张力的测量是使用无滴法进行的。样品已经熔化,在氧化钇稳定的氧化锆衬底上形成液滴,并加热到熔点以上200摄氏度。低键轴对称液滴形状分析已用于估算样品密度和表面张力,并提出密度和表面张力随温度变化的相关性。讨论了钢性能对金属层冷却的影响。特别地,发现金属温度表面张力系数d sigma / dT的符号最有可能为正。在这种情况下,Benard-Marangoni流与Rayleigh-Benard对流流相反。

著录项

  • 来源
    《Nuclear Technology》 |2019年第2期|200-212|共13页
  • 作者单位

    CEA, French Atom Energy Commiss, Severe Accid Modeling & Phys Lab, F-13115 St Paul Les Durance, France;

    CEA, French Atom Energy Commiss, Severe Accid Modeling & Phys Lab, F-13115 St Paul Les Durance, France;

    CEA, French Atom Energy Commiss, Severe Accid Modeling & Phys Lab, F-13115 St Paul Les Durance, France;

    CEA, French Atom Energy Commiss, Severe Accid Modeling & Phys Lab, F-13115 St Paul Les Durance, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Severe accident; in-vessel retention; focusing effect; steel and stainless steel properties; surface tension;

    机译:严重事故;血管内滞留;聚焦作用;钢和不锈钢性能;表面张力;
  • 入库时间 2022-08-18 04:14:00

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