浅析防硼误稀释保护在650 MW压水堆型中的应用

Analysis of the application of boron error dilution protection in 650 MW pressurized water reactor

自1979年,美国三哩岛发生核电史上第一起堆芯熔化的核事故,在此之后的切尔诺贝利核事故,直至2011年的日本福岛核事故,每一次重大核事故的背后,都与堆芯的反应性控制息息相关。在所有的反应性事故当中,硼误稀释作为一种易出现的事故诱因,引起了核电领域的重视。按照核安全法规的要求,秦山二期扩建工程在设计之中,增加了该保护的应用,减小了硼误稀释造成严重事故的几率。以秦山二期扩建项目中防硼误稀释保护的应用为基础,分析涉及该保护的改造内容、逻辑控制,并对该保护应用过程中存在的问题进行分析并提出应对方案。

The year 1979 witnessed the first nuclear meltdown accident on the Three Mile Island, U.S. Afterward,it was followed by the Chernobyl nuclear accident and the 2011 Fukushima nuclear accident in Japan. Every major nuclear accident is closely related to the control core reactivity. In all the reactive accidents, erroneous boron dilution is a common cause, which has aroused the attention of the nuclear power scholar circle. As per the requirements of nuclear safety regulations, the application of such protection has been added to the expansion project of Qinshan Nuclear Power Station Phase Ⅱ, which reduces the chances of erroneous boron dilution causing serious accidents. In this paper, based on the application of anti-dilution protection of boron in the expansion project of Qinshan Nuclear Power Station Phase Ⅱ, this paper analyzes the transformation content and logic control of the protection. On top of that, this paper also conducts an analysis of the existing problems during the application of the anti-dilution protection and proposes solutions accordingly.