[en] The Spanish Nuclear Power Plant Vandellos I was a gas-cooled natural uranium reactor located in Tarragona, which was stopped on 1989 after 17 years of operation. Furthermore, the Spanish National Radioactive Waste Management Company (ENRESA) was en charged of its dismantling. The plan proposed by ENRESA consisted of disassembling and demolishing the plant buildings and systems, with the exception of the concrete reactor should, which remained confined. From the radiological point of view the dismantling of any installation has several important characteristics as for example, the continuos variations of the kind and level of the radiological and conventional risks or the interventions on equipment and systems on which the workers have never worked before. In addition, some of the protection systems, available during the operation are put out of service, and some of the workers are not accustomed to work on dismantling tasks. Finally the volume of residual materials to be managed, both conventional and radioactive is notably greater. In this paper, the characteristics of the dismantling tasks from the radiological point of view are described together, with the radiological programme implemented during the dismantling of Vandellos I. (Author) 3 refs