PAULO ERNESTO DE OLIVEIRA LAINETTI
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Artigo IPEN-doc 23509 Decommissioning of uranium pilot plants at IPEN-CNEN/SP: facilities dismantling, decontamination and reuse as new laboratories for strategic programs2016 - LAINETTI, PAULO E. de O.; FREITAS, ANTONIO A. de; VASQUES, FRANCISCO M.F.; FERREIRA, ROBSON de J.; COTRIM, MARYCEL E.B.; PIRES, MARIA A.F.From beginning of 90’s, the Brazilian nuclear policy has been changed radically. This determined the interruption of most R&D fuel cycle activities and the facilities shutdown at Nuclear and Energetic Research Institute (IPEN). The existence of those facilities also implicated in the need of constant surveillance, representing additional obligations, costs and problems. The reasons to promote the dismantling of the IPEN’s Nuclear Fuel Cycle Pilot Plants elapsed mainly from the need of physical space for new activities, since the R&D in the nuclear fuel cycle area were interrupted. In the last decade, IPEN has changed its “nuclear profile” to a “comprehensive and multidisciplinary profile”. With the end of most nuclear fuel cycle activities, the former facilities were distributed in four different centers. Each center has adopted a different strategy and priority to face the D&D problem. The available resources depend on the specific program in each area’s development (resources available from other sources, not only from Brazilian National Nuclear Energy Commission (CNEN). One of those new activities is the IPEN’s Environmental Program. This paper describes the procedures, problems faced and results related to the reintegration of the former pilot plant areas as new laboratories of the Chemical and Environmental Technology CenterCQMA of the IPEN.Artigo IPEN-doc 23510 Molten salts as stripping media for radioactive superficial decontamination2016 - LAINETTI, PAULO E. de O.The main practical difficulty associated to the task of the dismantling and decommissioning of the IPEN’s old nuclear fuel cycle facilities has been the big amount of radioactive waste generated in the dismantling operations. The waste is mainly in the form of contaminated carbon steel structures. In the IPEN, the presence of contamination in the equipments, structures and buildings, although restricted to low and medium activity levels, constituted an important concern due, on one hand, to the great volume of radioactive wastes generated during the operations. On the other hand, it should be outstanding that the capacity of radioactive wastes stockpiling in IPEN found been exhausted. In function of the large waste volume generated in the dismantling operations, the main concerns and focuses of research and technological development in the IPEN’s Chemical and Environmental Center—CQMA have been the effluent and waste treatment subjects, besides the development of some special decontamination techniques, since most old nuclear fuel cycle facilities are installed in the CQMA’s area. The reduction of the radioactive waste volume has a significant impact in the decommissioning costs and in the amount of material to be stored. The mentioned steel structures, during the operations and after ten or twelve years after the facilities shut down, have presented severe corrosion. In the past, to protect them, several layers of paint were applied. Traditional decontamination methods were tried, such as acid pickling, alkaline washing and ultrasonic baths. Nevertheless, these methods have failed to reach effective decontamination. In this paper, we described some aspects and problems in decommissioning of IPEN’s nuclear fuel cycle facilities and it is presented an innovative method for radioactive superficial decontamination of steel structures using different molten salt compositions and temperatures as stripping media.Artigo IPEN-doc 20899 Use o thorium in the generation IV monten salt reactors and perspectives for Brazil2014 - SENEDA, JOSE A.; LAINETTI, PAULO E.O.Capítulo IPEN-doc 13901 Decommissioning of nuclear fuel cycle facilities in the IPEN-CNEN/SP2008 - LAINETTI, P.E. de O.; FREITAS, A.A. de; MINDRISZ, A.C.; CAMILO, R.L.Artigo IPEN-doc 15590 Molten Salts as stripping media for radioactive superficial decontamination2010 - LAINETTI, PAULO E. de O.Artigo IPEN-doc 10730 Decommissioning of nucler fuel cycle facilities - IPEN's experience2005 - LAINETTI, P.E.O.Artigo IPEN-doc 19347 Use pf thorium in the generation IV Molten Salt reactors and perspectives for Brazil2013 - SENEDA, JOSE A.; LAINETTI, PAULO E.O.Artigo IPEN-doc 15093 Artigo IPEN-doc 12163 Reintegration of areas of the IPEN´S dismantled nuclear fuel cycle pilot plants as new laboratories of the CQMA2007 - LAINETTI, PAULO E.O.; COTRIM, MARYCEL E.B.; VASQUES, FRANCISCO M.F.; FERREIRA, ROBSON de J.; PIRES, MARIA A.F.Artigo IPEN-doc 17121 The importance of thorium in the context of the generation IV advanced reactors and the IPEN's experience2011 - LAINETTI, PAULO E.O.; MINDRISZ, ANA C.; FREITAS, ANTONIO A.