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Some Aspects of LWR's Water Chemistry

机译:轻水堆水化学的某些方面

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The hypothesis laid down in this paper offers an alternative to the current interpretation of the processes: hideout (hideout-return), crud deposition and change of the coolants activity level in the nuclear power reactors under different operating conditions. This alternative is based on the supposition that the heat flux has not a direct effect on the processes mentioned above, but acts through the heat transfer mechanism in the boundary, caused by itself. The boundary influenced by heat flow is in non-equilibrium state and in such system states (at adequate heat flux) non-equilibrium structures called dissipative structures arise which are closely connected with heat transfer mechanism. The transport and the location of the colloidal corrosion products dispersed in steam generators-or reactor water during the units operation are strongly influenced by the existence of dissipative structures. The transport and location of the main part of ion species depend also on the existence of these structures because the colloidal particles act like collectors of the ions dissolved in the water (The ions are inserted in the colloidal particles double layer). The hideout and hideout-return phenomena are interpreted as closely connected with the existence of the above mentioned dissipative structures. It was attempted to consider the changes in nuclide concentrations in the LWR coolant upon start-up and shutdown as hideout respectively hideout-return processes. The recent shutdown chemistry aspects are discussed also.
机译:本文提出的假设为当前的过程解释提供了一种替代方法:在不同的运行条件下,藏匿(隐藏返回),残渣沉积和冷却剂活性水平的变化。该替代方案基于这样的假设,即热通量对上述过程没有直接影响,而是通过边界自身的传热机制起作用。受热流影响的边界处于非平衡状态,并且在这种系统状态下(在足够的热通量下)会出现称为耗散结构的非平衡结构,该结构与传热机制密切相关。在单元运行过程中,分散在蒸汽发生器或反应堆水中的胶体腐蚀产物的运输和位置受到耗散结构的强烈影响。离子种类的主要部分的迁移和位置还取决于这些结构的存在,因为胶体粒子的作用就像溶解在水中的离子的收集器一样(离子被插入到胶体粒子的双层中)。隐藏和隐藏返回现象被解释为与上述耗散结构的存在紧密相关。试图将LWR冷却液中启动和关闭时核素浓度的变化分别视为隐藏物和隐藏物返回过程。还讨论了最近的关机化学方面。

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