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首页> 外文期刊>Annals of nuclear energy >Assessment of the MDNBR enhancement methodologies for the SMART control rods banks withdrawal event
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Assessment of the MDNBR enhancement methodologies for the SMART control rods banks withdrawal event

机译：评估SMART控制棒库撤回事件的MDNBR增强方法

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摘要

For an electricity generation and seawater desalination, a 330 MW System-integrated Modular Advanced ReacTor (SMART) was developed by KAERI. The safety level of the SMART is enhanced when compared to that of the typical commercial reactors, with the aid of an elimination of a large break loss of coolant accident by placing the major components of the primary system in a reactor vessel and the adoption of a new technology and a passive design concept into the safety system. However, the events related to reactivity and power distribution anomalies have been evaluated as vulnerable points when compared to the other initiating events in the SMART, since the reactivity worth of the control rods (CR) banks is quite large due to the boron free core concept. Especially, safety margins, i.e., minimum departure from nucleate boiling ratio (MDNBR), are significantly threatened during the CR banks withdrawal event. Therefore, MDNBR enhancement methodology for the CR banks withdrawal event should be considered to further enhance the safety level of the SMART design. Two methodologies have been suggested to enhance the MDNBR during the CR banks withdrawal event: the application of a DNBR trip function into a core protection system and a turbine trip delay methodology. Sensitivity studies are performed to evaluate the two MDNBR enhancement methodologies and show that the suggested methodologies could enhance the MDNBR during the CR banks withdrawal event of the SMART.
机译：为了发电和海水淡化，KAERI开发了330 MW系统集成模块化先进反应堆（SMART）。与典型的商用反应堆相比，SMART的安全等级得到了提高，这是通过将一次系统的主要部件放置在反应堆容器中并采用了一个新技术和被动设计概念被纳入安全系统。但是，与反应和功率分布异常有关的事件与SMART中的其他起始事件相比，已被视为易受攻击的点，因为由于无硼堆芯的概念，控制棒（CR）库的反应性价值相当大。特别是，在CR银行提款事件中，安全裕度（即最小偏离核沸腾比（MDNBR））受到严重威胁。因此，应考虑针对CR银行提款事件的MDNBR增强方法，以进一步提高SMART设计的安全级别。已经提出了两种方法来增强CR组退出事件期间的MDNBR：将DNBR跳闸功能应用到堆芯保护系统中以及涡轮机跳闸延迟方法。进行了敏感性研究，以评估两种MDNBR增强方法，并表明所建议的方法可以在SMART的CR银行提款事件期间增强MDNBR。

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