针对核电厂安全壳喷淋系统(EAS)出现的强烈管道振动问题,采用现场振动试验和数值计算相结合的方法进行研究。研究发现,管道节流孔板过度节流,导致在孔板下游出现汽蚀是诱发管道强烈振动的根本原因;通过数值计算方法对孔板压降、级数、孔径和结构形式等进行一系列优化设计,给出采用三级孔板消除气蚀的减振改造方案,并对改造方案开展完整性评估。通过对改造后的管道进行再鉴定试验表明,采用本文的优化设计分析方法设计的工程改造方案很好地解决了孔板汽蚀诱发的管道强烈振动问题,管道振动和噪声均大幅降低,可以确保EAS管道系统的长期安全运行。 Aiming at the strong pipeline vibration of the containment sprinkler system (EAS) in nuclear power plant, the method of on-site vibration test and numerical calculation are combined. It is found that the excessive throttling of the pipe orifice leads to the cavitation downstream of the orifice plate as the root cause of the strong vibration of the pipe. A series of numerical calculations are performed on the pressure drop, series, aperture and structure of the orifice plate. The design of optimization is given. The scheme of vibration reduction with three-level orifice to eliminate cavitation is given and the integrity assessment of the scheme is carried out. The re-qualification tests on the reconstructed pipeline show that the engineering reconstruction scheme designed by the optimized design and analysis method of the paper can well solve the problem of strong vibration of the pipeline induced by orifice cavitation, greatly reduce the vibration and noise of the pipeline, and can ensure Long-term safe operation of EAS piping systems.