The decommissioning is the last stage in the shelf-life period of any nuclear or radioactive facility. The goal is the controlled removal of the source term in a way that the future use of the buildings decommissioned does not entail any radiological risk for both people and environmental according to a radiological criteria regulator approved. MARSSIM is the methodology followed by many countries to demonstrate compliance with these radiological criteria.

This paper describes the adaptation of the MARSSIM methodology to demonstrate compliance of radiological criteria established by European Commisión recommendation (trivial dose equal to 10 µSv·y⁻¹, (Comision for European Communities, Radiation Protection 113. Recommended radiological protection criteria for the clearance of buildings and building rubble from the dismantling of nuclear installations, Luxembourg: Office for Official Publications on the European Communities, 2000). Particularly, it has been applied to a former U concentrate facility located in the heart of Madrid (Spain), at the site known today as CIEMAT. The obtained results guarantee that demolition rubbles can managed as non-radiactive waste and that there are not any radiological risk for people in case of building reuse.

退役是任何核设施或放射性设施保质期的最后阶段。目标是按照监管机构批准的放射标准，以受控方式删除源术语，以使将来退役建筑物的使用不会对人员和环境造成任何放射风险。MARSSIM是许多国家用来证明符合这些放射学标准的方法。

本文介绍了MARSSIM方法的适应性，以证明符合欧洲Commisión建议（小剂量等于10  µSv·y ^-1，（欧洲共同体委员会，辐射防护113）。拆除核装置的建筑物和建筑瓦砾，卢森堡：欧洲共同体官方出版物办公室，2000年），尤其是已应用于位于马德里市中心（西班牙）的原U精矿设施如今获得的结果保证了拆除后的瓦砾可以作为非放射性废物进行管理，并且在建筑物重复使用的情况下也不会对人们造成任何放射风险。