NUMERICAL INVESTIGATION OF THE LEAKAGE BEHAVIOUR OFREINFORCED CONCRETE WALLS

摘要

For the verification of nuclear power plant safety, the leakage behaviour of the containment walls is ofdecisive importance. In order to improve the knowledge of the leakage behaviour through cracks during a severeaccident an experimental setup was developed at IfMB and several tests with different parameters wereperformed. To improve the understanding of the behaviour of the wall elements during the tests numericalsimulations of the performed leakage experiments are necessary. Reliable numerical tools provide a basis for thetransfer of the leakage behaviour from the tested specimens to the behaviour of whole containment structures. Toaddress the task of developing tools for the numerical simulation of the leakage behaviour of reinforcedcontainment structures, EDF and IfMB decided to cooperate. During this cooperation two different numericalapproaches had been made basing on existing tools and models of EDF and IfMB. In the following sections ashort overview about the two different models will be given. For the numerical investigation of the leakagephenomena IfMB used the commercial Finite-Element-Program ADINA with its capability to solve coupledfluid-structure-interaction (FSI) problems. EDF used two of their self-developed tools for the numericalsimulation in a chained calculation: CODE ASTER? for the mechanical calculation of the specimen andECREVISSE for the air/steam/water leakage flow calculation. The calculated leakage rates and temperatureprofiles of both models will be compared to the experimentally determined leakage rates and the results will bediscussed.