The Interfaculty Reactor Institute (IRI) is part of Delft University of Technology. The InstituteŽs principal scientific activities are materials research involving neutrons, electrons and positrons, as well as other nuclear techniques, physical aspects of nuclear reactors, research in radiation physics, radiation technology, radiochemistry, radiation chemistry and environmental research. The Institute has unique expertise in the area of nuclear reactors and associated scientific research. It is the Dutch national centre for training and research in this field.