Abstract
Generally the piping system of a nuclear power plant (NPP) has to be designed for normal loads such as dead weight, internal pressure, temperature, and accidental loads such as earthquake. In the proposed paper, effect of Stockbridge damper to mitigate the response of piping system of NPP subjected to earthquake is studied. Finite element analysis of piping system with and without Stockbridge damper using commercial software SAP2000 is performed. Vertical and horizontal components of earthquakes such as El Centro, California, and Northridge are used in the piping analysis. A sine sweep wave is also used to investigate the control effects on the piping system under wide frequency range. It is found that the proposed Stockbridge damper can reduce the seismic response of piping system subjected to earthquake loading.
Highlights
Nuclear power plant (NPP) piping system needs to be designed for various loads such as dead weight, internal pressure, temperature, and accidental loads as well as for seismic loads
Fujita et al [7] proposed a method of nonlinear seismic response analysis for a piping system using a combination of the Finite Element Method (FEM) and the Differential Algebraic Equations (DAE)
From the results of the sine sweep wave, it is confirmed that the proposed Stockbridge damper (SBD) can reduce the vibration in all frequency domains (0.1 Hz to 20 Hz)
Summary
Nuclear power plant (NPP) piping system needs to be designed for various loads such as dead weight, internal pressure, temperature, and accidental loads as well as for seismic loads. These loads can occur inside the nuclear power plant piping system and affect the operation of the plant. Shimuzu et al [3] developed a seismic response analysis procedure of the piping system and performed an evaluation of the piping response by comparing simulated results and tested results. Parulekar et al [5] performed analytical and experimental research to reduce the vibration of the piping and equipment of a nuclear power plant using elastoplastic dampers (EPD). Bakre et al [9] attempted to optimize x-plate dampers and the seismic effectiveness of these dampers for a piping system in industrial installations
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