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Seismic Analysis Report for Air Intake Silencer

All internal combustion engines produce noise, the intensity and magnitude of the noise will vary greatly depending upon engine type naturally aspirated or turbocharged, horse power developed, means of scavenging, type of fuel used, number of cycles whether 2 cycle or 4 cycle engine etc. Among the pre-dominant source that makes up the engine noise are the engine intake and exhaust. The silencer plays a very crucial role in these devices for noise controlling which causes vibration in these devices. In this paper we are study about qualification of the intake air silencer for the Emergency Diesel Generator (EDG) of the Shin-Ulchin 1 & 2 (henceforth referred to as SUN12) nuclear power plant. The silencer is of double cylindrical shell construction with absorber material (mineral wool + glass cloth) filling the insulating regions in-between in order to dampen the noise transmission. The finite element method has been relied on in order to evaluate the seismic qualification of the equipment involved. For this purpose, the Finite Element Codes embedded in ANSYS Release 12.1 have been employed.