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IBQN (Brazilian Institute for Nuclear Quality) is the Independent Technical Supervisory Agency (OSTI), accredited by CNEN (Comissão Nacional de Energia Nuclear), the Brazilian Nuclear Licensing Authority perform Independent Technical Supervision (STI) of nuclear facilities.

The OSTI acts with impartiality and independence, closely supervising activities involving safety related components and installations from the design stage to commissioning and in-service inspection, including the manufacturing, construction and erection stages.