Finite element-based vibration Analysis of WWER-440 reactors

摘要

A finite element model describing the mechanical vibrations of the whole WWER-440 primary circuit was established to support the early detection of mechanical component faults. A special fluid-structure module was developed to consider the reaction forces of the fluid in the downcomer upon the moving core barrel and the reactor pressure vessel (RPV). This fluid-structure in- teraction (FSI) module is based on an approximated an- alytical two-dimensional solution of the coupled system of three-dimensional fluid equations and the structural equations of motions.