核安全级架空高密度聚乙烯材料管道设计方法的研究和应用

Research and Application of Design and Evaluation Methods for Above Ground Safety Related HDPE Piping

由于高密度聚乙烯(HDPE)优异的抗腐蚀和抗微生物材料特性,作为彻底解决核电站海水系统生物附着和腐蚀问题的替代方案之一,HDPE管道已引起了核电站业主的广泛关注。由于HDPE管道力学性能和承载能力与钢管的极大差异,传统的金属设计规范和力学分析评价方法无法证明HDPE管道能满足系统的功能设计要求。基于HDPE材料的力学特性,从压力设计、支撑设计、柔性设计、抗震设计、特殊载荷考虑和力学分析评价6个方面说明了核级架空HDPE管道设计中的要点,提出了适用于核级架空HDPE管道的设计评价方法,并成功应用于国内首个示范工程中。

Due to excellent corrosion resistance and resistance of the high density polyethylene pipe （HDPE） piping at nuclear facilities to microbial materials, as one of the thorough ahernative solutions to biofouling and corrosion problem of sea water system for nuclear power stations, HDPE piping has attracted wide attention of nuclear power station owners. Due to the great differences between HDPE piping and steel piping in mechanical proprieties and bearing capacity, conventional design codes and mechanical analysis and evaluation methods used in steel piping cannot prove that HDPE piping can meet the function- al design requirements of the system. Based on the mechanical proprieties of HDPE, the essential points in the design of nuclear grade above ground piping were presented from six aspects as pressure design, support design, flexibility design, seismic design, considerations of special loads and mechanical analysis and evaluation, the design and evaluation methods for nuclear grade above ground HDPE piping were proposed and were successfully applied in the first demonstration project in China.