A New Concept of Decommissioning Planning for Nuclear Research Reactor as Part of Life Cycle Management

摘要

This work will analyze the possibility to reutilize the RR structures, systems and components (SSCs) after decontamination and partial dismantling. In the RR will be developed a cleanup plan as part of decommissioning plan and release of site from initial destination to a new destination. Dose limits for release of site are in the range of 10 Sv/a~(-1) -mSv/a except the Reactor Block, basement of Reactor Block and Hot Cells, where the dose limit for the workers in the newly authorized practice will be of max. 20 mSv/a.rnWe propose the utilization of the reactor block as wet storage for Co-60 sources (30 kCi) recycled from decommissioning of medical installations. This storrage space is highly needed as currently there are in storage in IFIN-HH and the Research Nuclear Centre in Pitesti aprox. 18 kCi. In the technological spaces of the actual primary circuit will be placed the conveyor-transport system for varrious materials radiation processing. Hot cells, nuclear chemistry laboratories, workshop for depleted uranium, cranes, and sanitary ventilation could all be used after decontamination. Other items, like stack, technological ventilation, cooling pond for SNF, electrical and automatization systems will be removed by dismantling. In conclusion, RR as nuclear facility will be released from regulatory control as terminated practice and in the same sitting will be placed an irradiation facility with Co-60 source and electron accelerator (max. 10 MeV) for radiation processing and technologies as well as research in material sciences.rnAs a result, after 40 years (1947-1997) of functioning, 10 years (1997-2007) in transitional phase, 5 years (2008-2013) in D&D phase, there will be other 50 years of utilisation with the new destination, also closely related with the nuclear field.rnThis concept is based on lessons learned and experienced during the commissioning of the irradiation facility with Co-60 (15 kCi) placed in the basement of Subcritical Assembly HELEN in IFIN-HH.