Seismic Qualification of Bubbler at WWER-1000 MW Type NPP

摘要

The objective of the study is seismic qualification of already installed bubbler in operating WWER-1000 MW type NPP. The criteria of ASME code are applied. A series of finite element models are developed to simulate the operating parameters and as-built conditions of the equipment. The plant specific floor response spectra are used in the analysis. The seismic adequacy of the bubbler is clarified on the basis of the results from the study. It is estimated that these conclusions are also valid for similar equipment at another unit of the same NPP.