New trends in vibration and acoustic monitoring in nuclear components in EDF

Main points of feed back experience obtained by EDF since 1984, in the area of 900 MW and 1300 MW units pressurised water reactors surveillance, are firstly commented. The monitoring programs objective evolution is presented from projects, concerning sensors maintenance conditions upgrading and new monitoring systems development. Current R and D programs are then presented. They concern new digital techniques application for plant operator assistance and for automatic monitoring. Some future R and D programs are lastly proposed to improve reactors critical components surveillance. (author)