EXPERIMENTAL INVESTIGATION OF THE LEAKAGE BEHAVIOUR OFREINFORCED CONCRETE WALLS

摘要

Information about the leakage behaviour of the containment wall of nuclear power plants is of decisiveimportance for the verification of nuclear power plant safety. In order to study the leakage behaviour of the innerwall of a double walled containment structure under air-steam loads, a model wall section was tested. The wallsection is 1,8 m wide 2,7 m long and 1,2 m thick.The aim of the project was to examine the thermo-hydraulic process of air-steam leakage with possiblecondensation through known crack patterns. The tests simulate a section of a containment wall and allow tomodify the crack width independent from the temperature and internal pressure. Therefore tests at varying crackopenings could be performed while using the same load scenario. Additionally to the tests with air steam mixturespure air tests were performed before, in between and after steam tests in order to compare the leakage rates for thegiven crack pattern.A significant reduction of leakage was observed during the course of the tests. This leads to the conclusion thata deterioration of the cracks is occurring. But instead of washing out, the cracks actually get clogged and the flowis reduced.