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Experimental investigation of gas transport induced by containment spray activation during a scaled severe accident scenario

机译：大规模严重事故场景下安全壳喷淋活化引起的气体传输的实验研究

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摘要

We present the results of an experimental study on the activation of sprays representative of those used in a generic light water reactor containment for severe accident mitigation. Depending on the initial conditions, the spray nozzle type and the spray water flow rates, the spray may cause higher hydrogen concentration during depressurization due to steam condensation, or it may erode the hydrogen stratification by enhanced mixing. To investigate these phenomena, the tests were performed in the PANDA facility at Paul Scherrer Institut, Switzerland in the frame of the ERCOSAM-SAMARA project. The experiments followed a test sequence based on a postulated severe accident scenario scaled from a nuclear power plant design. The scaled scenario consisted of the formation of a stratified helium-rich (substitute for hydrogen) atmosphere in one of the PANDA vessels followed by the activation of a spray. Temporal evolution and spatial distribution of the gas temperature and the gas concentrations at selected positions were measured using thermocouples and mass spectrometers. Four tests were performed with two different spray nozzle types, two spray flow rates and two initial vessel wall temperatures of 105 degrees C and 135 degrees C, which created condensing and non-condensing environments, respectively. The different initial conditions lead to different density stratification. The effect of these different initial and boundary conditions on the transport and mixing of gases in the vessels due to the activation of the spray is revealed by these tests. The spray causes a fast breakup of the stratification and a complete mixing in the vessel in which it was injected. The concentration measurements in the adjacent connected vessel showed the presence of helium at the bottom of the vessel suggesting the possibility of hydrogen transport to the lower parts of the containment in a three gas mixture environment.
机译：我们介绍了代表普通轻水反应堆安全壳中用于严重事故缓解的喷雾活化的实验研究结果。根据初始条件，喷嘴类型和喷雾水流量，喷雾可能会在减压过程中由于蒸汽凝结而导致较高的氢浓度，或者可能会由于增强混合而腐蚀氢分层。为了调查这些现象，在ERCOSAM-SAMARA项目的框架下，在瑞士Paul Scherrer Institut的PANDA设施中进行了测试。实验遵循的是基于假设的严重事故情景的测试序列，该情景是根据核电站设计缩放的。缩放的方案包括在一个PANDA容器中形成分层的富氦（代替氢）气氛，然后激活喷雾。使用热电偶和质谱仪测量气体温度和选定位置处气体浓度的时间演变和空间分布。使用两种不同的喷嘴类型，两种喷雾流量和两种初始容器壁温度分别为105摄氏度和135摄氏度进行了四项测试，分别创建了冷凝和非冷凝环境。不同的初始条件导致不同的密度分层。这些测试表明，由于喷雾的激活，这些不同的初始条件和边界条件对容器中气体的运输和混合的影响。喷雾会导致分层迅速破裂，并在注入它的容器中完全混合。在相邻连接容器中的浓度测量结果表明，在容器底部存在氦气，这表明在三种气体混合环境中，氢可能会传输到安全壳的下部。

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  • 来源
    《Nuclear Engineering and Design》 |2019年第2期|88-98|共11页
  • 作者

    Paranjape Sidharth; Mignot Guillaume; Kapulla Ralf; Paladino Domenico;

  • 作者单位

    Oregon State Univ, 1500 SW Jefferson St, Corvallis, OR 97331 USA;

    Paul Scherrer Inst, Lab Reactor Phys & Thermal Hydraul, CH-5232 Villigen, Switzerland;

  • 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
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