Reliability Analysis of Off-Plant Power for Multi-Units

Chen Honghao, Ren Cheng, Wu Jian, Liu Deyi, Luo Yang, Zou Shengjia, Wang Zilong
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引用次数: 1

Abstract

Globally, multi-units are located at the same nuclear power plant site. After several serious nuclear accidents, the overall risk assessment of a nuclear power plant with multiple reactors has attracted much attention. Combined with the concept of PSA (probabilistic safety analysis) for multi-units, this paper analyzes the off-plant power supply configuration of 9 units in Qinshan Nuclear Power Base. In view of the 6KV emergency busbar directly affected by the instability of the off-site power grid, the correlation among several units is fully considered, and the exploratory research and analysis of off-site power grid reliability is carried out in Qinshan Nuclear Power Base. Taking the reliability of external power grid of Qinshan Nuclear Power Base as an example, the reliability of emergency bus and the influence range and contribution of various analysis factors to the evaluation results are quantitatively analyzed through fault tree modeling. The results of model analysis are in line with the actual situation. The analysis concept based on the multi-unit PSA methodology should be used in a wider range. For example, thematic analysis should be carried out for other highly correlated originating events (common cold source, equipment common cause failure, etc.), and the development and progress of multi-unit PSA should be promoted through practice with a point-to-surface approach. In the follow-up research, we should improve the model system, take the actual situation into full consideration, and develop a set of overall risk assessment system that can reflect the real-time risk level of multiple unit site.
多机组离厂电源可靠性分析
在全球范围内,多台机组位于同一核电站厂址。在发生多起严重核事故后,多堆核电站的整体风险评估受到了广泛关注。结合多机组概率安全分析(PSA)的概念,对秦山核电基地9台机组的厂外供电配置进行了分析。针对6KV应急母线直接受到场外电网失稳的影响,充分考虑多台机组之间的相关性,在秦山核电基地开展了场外电网可靠性的探索性研究与分析。以秦山核电基地外网可靠性为例,通过故障树建模,定量分析了应急母线可靠性以及各分析因素对评估结果的影响范围和贡献。模型分析的结果符合实际情况。基于多单元PSA方法的分析概念应在更广泛的范围内应用。例如,对其他高度相关的起源事件(常见冷源、设备共因故障等)进行专题分析,以点对面的方式,通过实践推动多单元PSA的发展和进步。在后续研究中,应完善模型体系,充分考虑实际情况,制定一套能够反映多单元现场实时风险水平的整体风险评估体系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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