1. Kernforschungszentrum Karlsruhe GmbH Laboratorium fur Aerosolphysik und Filtertechnik I, Postfach 3640 D-7500 Karlsruhe, Federal Republic of Germany
2. IPSN Centre d’Etudes Nucleaires, Cadarache, France
3. Power Reactor and Nuclear Fuel Development Corporation Oarai Engineering Center, 4002 Oarai-machi, Ibaraki-ken, Japan