1. Japan Nuclear Cycle Development Institute, ATD/OEC, 4002 Narita O-arai, Ibaraki, 311-1393 Japan
2. Kyusyu University, Institute of Enviromental Systems 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
3. Forschungszentrum Karlsruhe, IKET, Postfach 3640 D-76021, Karlsruhe, Germany
4. CEA, DRN/DTP/SMTH, CE de Grenoble 38054 Grenoble CEDEX 9, France
5. CEA, DENCAD/DER/SERI, CE de Cadarache 13108 Saint Paul lez Durance CEDEX, France