[en] This report is a summary of the results obtained during the five-year programme 'Plutonium recycle in LWRs' (1975-79) which has been made possible after the completion of the synthesis studies on 'Control and Safety' and on the 'Environmental impact'. The work performed during the programme is reported; the contracts concluded and their main results and conclusions are summarized. The activity was devoted to studies of general interest and to R and D in order to improve the scientific and technical knowledge of plutonium recycling. General studies included an assessment of the environmental impact of plutonium recycling in the EC as well as research aimed at reducing this impact. Improvements were achieved on neutron-physics parameters of the actinides, on neutron computer codes for plutonium-fuelled LWRs, on control and safety and on the in-pile behaviour of mixed-oxide fuels. The conclusions state that, while fostering a fruitful exchange of information in the Community, the programme has contributed to demonstrating the feasibility of plutonium recycling in LWRs