HWR-827 ____________________________________OECD HALDEN REACTOR PROJECT______________ CLUSTERING TECHNIQUES AND THEIR APPLICATION TO THE CLASSIFICATION OF TRANSIENTS IN NUCLEAR POWER PLANTS by Piero Baraldi*, Enrico Zio*, Paolo Fantoni, Davide Roverso February 2007 *Politecnico di Milano NOTICE THIS REPORT IS FOR USE BY HALDEN PROJECT PARTICIPANTS ONLY The right to utilise information originating from the research work of the Halden Project is limited to persons and undertakings specifically given the right by one of the Project member organisa- tions in accordance with the Project's rules for "Communication of Results of Scientific Research and Information". The content of this report should thus neither be disclosed to others nor be reproduced, wholly or partially, unless written permission to do so has been obtained from the appropriate Project member organisation.