所谓非能动安全（passive safety），就是不需要外动力，既不需要人员的干预，又无移动或转动的机械部件，当核电站发生事故时仅仅依靠自然力，如流体的重力、自然循...
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实验研究表明：三大非能动安全系统的设计是合理、可行的，基本能满足其赋与的功能要求。
These experiments proved the design of these passive systems are feasible and reliable and can meet basically the required safety functions.
RELAP5程序是目前大型的热工水力瞬态分析程序，本文把它作为非能动安全研究的工具。
The RELAP5 code is a great thermal-hydraulic transient analysis code at present, and it is as the tool of studying passive safety in this thesis.
从理论上分析了密度锁在核反应堆非能动安全中的作用及特点，介绍了密度锁的工作原理和结构形式。
The action, work principle and characteristics of density locks used in nuclear reactor passive safety are analyzed theoretically.
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