Meanwhile, the four corners are respectively and symmetrically provided with positioning pin holes, so that the assembly of the pressure water reactor fuel element can be more flexible and convenient.
同时，在四角位置分别对称布置定位销孔，从而使压水 堆燃料组件的安装更加灵活方便。
They had been interested in thorium — a radioactive element that can fuel nuclear reactors but not be processed into weapons.
他们当时对一种放射性元素钍很感兴趣，这种元素能驱动核反应堆，却不能制造生产成武器。
As a new type of research reactor with new fuel element and core structure, no experience can be used for the design and implementation of the power regulating system.
某新型研究堆采用新型燃料元件和堆芯结构，反应堆的控制特性缺乏基本数据，功率调节系统的设计无可借鉴经验。
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