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Research of LMFBR Core Assemblies Aseismic Model

Author: LiHaiLong
Tutor: LuDaoGang
School: China Institute of Atomic Energy
Course: Nuclear Energy Science and Engineering
Keywords: Fast Reactor Finite Element Gap element model Core seismic
CLC: TL327
Type: Master's thesis
Year: 2006
Downloads: 76
Quote: 1
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Abstract


The safety assessment of the reactor core is an important issue in fast breeder reactor seismic design . When an earthquake occurs , it should be to ensure that the structural integrity of the core components and nuclear power plant scram required . Fast reactor core dynamics problems is the novel also difficult . The gap between the hundreds of root core components , sometimes some of the components will be exposed , which brought on the nonlinear contact problem . Necessary in order to predict the seismic response of the core components , the core component of the nonlinear impact analysis . Therefore , the need to establish the component collision model to predict the seismic response of the component group . Hope to establish a relatively simplified calculation model, the degree of freedom of the model is relatively small, the number of degrees of freedom is limited in correct response to the collision between components scope of the phenomenon . Listed in France, Japan , Italy and other countries in recent years for the fast breeder reactor did a series of experiments and theoretical studies , comprehensive introduction to the kinetic analysis method used in the nuclear industry . Beam element in the finite element eigenvalue of the completion of the single components and the free vibration analysis , using two finite element program ANSYS and CASTEM2000 ( France CEA / DMT Development) , and the results were compared . Using the two methods (modal method and the direct integration method ) to complete the seismic analysis of single components . Spring elements and gap elements to simulate the impact between components analysis , further complete the seismic model of a single row of components in the air , the core component of the single row of horizontal earthquake displacement time histories , acceleration time and collision force . Part of the calculation results and SYMPHONY ( France and Japan to complete the experiment ) experimental results are compared both fit better , and further validate the rationality of the finite element model . After completion of the seismic model of fast reactor core of the single row of components in the air , it can proceed to the seismic model of fast reactor core single row component in water , thereby completing the entire fast reactor core seismic model .

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CLC: > Industrial Technology > Nuclear technology > Engineering of Nuclear Reactors > Reactor physics and design, calculation > Reactor dynamics
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