模块式小型堆稳压器除气系统设计研究

Research on Design of Pressurizer Degassing System for Small Module Reactors

为克服采用传统的化容系统下泄除气法所带来的耗时较长和操作复杂的问题,提出了利用稳压器进行热力除气的稳压器除气系统设计方案。该方案基于稳压器的稳态除气模型和优化算法,研制了稳压器除气优化专用程序,同时开展了停堆期间全范围工况下模块式小型堆稳压器除气优化计算和分析,获得了最优的除气限流孔尺寸以及除气运行影响因素。通过实际的除气效果计算评估表明,本文所设计的稳压器除气系统理论上最快可以在4.13 h内完成除气,相比传统化容下泄除气法具有明显的时间优势。

In order to overcome the problems of time-consuming and complex operation caused by the traditional degassing method of chemical and volume control system, a design scheme of pressurizer degassing system using the pressurizer for thermal degassing is proposed. A dedicated computer program is developed based on pressurizer steady degassing model and optimization algorithm, by which the pressurizer degassing optimization calculation and analysis for the small module reactor is carried out in full range of shutdown operation conditions, and the size of the optimized flow limiting orifice and influence factors are obtained. The evaluation with the practical degassing effects shows that, the degassing system proposed in this paper can complete the hydrogen removing task in 4.13 hours theoretically, which is with obvious advantages over the traditional degassing method of the chemical and volume control system.