NHR-200Ⅱ型低温供热堆安全特性

为提高低温供热堆的经济性，实现其供电、供气、海水淡化以及供暖的多用途目标，其主要热工参数须大幅提升。因此，提出一种新的低温供热堆堆型NHR-200Ⅱ，相比于NHR-200，其热工参数须大幅提升，同时又必须保持低温供热堆系统简化、固有安全性好的特性。为达到这一目标，沿用了低温供热堆一体化、全功率自然循环、自稳压以及非能动安全系统的设计特点，通过挖掘潜力、合理匹配系统参数来提高效率。对两种设计扩展工况的分析表明非能动安全系统的设计是有效的，反应堆堆芯不会发生裸露。本研究成果也可为其他小型水冷堆的设计提供借鉴。

Safety Characteristic of NHR-200Ⅱ

To improve the economics of nuclear heating reactor and achieve multi-purpose targets for electric and steam supply, desalination and heating, the main thermal parameters should be greatly improved. Therefore, a new nuclear heating reactor type NHR-200Ⅱ was proposed. Compared with previous NHR-200, the thermal parameters of NHR-200Ⅱ should be greatly increased. At the same time, the characteristics of system simplified and inherent safe should be kept. To achieve this goal, the design features of nuclear heating reactor, such as integrated arrangement, full power natural circulation, self-pressurized performance and passive safety were employed. The efficiency was improved by exploiting potential and reasonably matching system parameters. The simulation results of two design extension conditions show that the passive safety system is effective and the core uncover will not occur on loss of coolant accident condition. This research can also provide reference for the design of other small water cooled reactors.