Aerosol instrumentation for the Marviken aerosol transport tests

The primary purpose of the Marviken ATT (Aerosol Transport Tests) project is to create a data base from large scale facilities on the behaviour of vapours and aerosols produced from overheated core materials within typical Pressurized Water Reactor (PWR) primary systems and Boiling Water Reactor (BWR) pressure vessels. The data base is needed to verify theoretical methods which can be and are being used to predict results of postulated core melt accidents for a wide range of geometries and fluid conditions. The existing Marviken test facility has been modified to meet these objectives. The program has a second objective which is to provide a large-scale demonstration of the behaviour of aerosols in primary systems. Headings: system design; test conditions; aerosol sampling; sampling operations; observations from the first fissium test. (author)