Security in nuclear power plants demands severe limitations of the maximal drop time of rod cluster control assemblies. In February 1995, several assemblies of the Chinese plant in DAYA BAY failed to comply with these requirements. Electricite De France undertook a research program to get a better insight of this problem since the plant has been built by French and also because the French new 4 loops N4 reactor was equipped with the same guide tubes. This paper is limited to a numerical study of the influence of the pressure ofrces applied to contro lrods and due to flow circulation through the guide tubes.
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机译：核电厂的安全性要求严格限制棒束控制组件的最大跌落时间。 1995年2月，在大亚湾的中国工厂的几个装配不符合这些要求。法兰西电力公司（Electricite De France）进行了一项研究计划，以更好地了解这一问题，因为该厂是由法国人建造的，并且因为法国新的4回路N4反应堆配备了相同的导管。本文仅限于数值研究施加于控制杆上的钢筋的压力影响以及由于流经导管的循环而产生的影响。
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