Belgian reactor 3 (BR3) Dismantling System. Two main mechanical cutting techniques were selected: the circular saw and the band saw in association with a turntable. The goal was to cut the highly active internals into segments compatible with the final disposal waste package (400 l waste drum). All cutting operations were carried out underwater in the refuelling pool. The decommissioning project for the BR3 pressurized water reactor was also important as a test bench for different dismantling tools and decontamination techniques. After the dismantling of the reactor pressure vessel and its internals, using different mechanical and thermal cutting tools, a new tool, water jet cutting, was used for the dismantling of some large contaminated components inside the reactor building. The equipment was supplied by the consortium CYBERNETIX - AQUARESE.