Regulatory experience since 1995 in the field of instrumentation and control and support Systems of Nuclear Power Plants in Brazil

This paper presents licensing and regulatory control experiences in the field of instrumentation and control (I and C), electrical and computer-based support systems of the Brazilian nuclear power plants (NPP), since the issuance of Authorization for Permanent Operation (AOP) of ANGRA 1 NPP, in December 1994, covering licensing activities of ANGRA 2 from 1996 to 2006. The reports of the first PSR are under discussion and evaluation by CNEN, since 2005, including an evaluation of AOP's Improvement Programs closer related to electrical and I and C systems discussed in this report. ANGRA 1 is also implemented major modifications, as the steam generators replacement, the use of advanced nuclear fuel and the plant power uprate, which will required many design changes and/or modernization of I and C and related support systems. With respect to the Construction License of ANGRA 3, it is briefly presented the licensing status and preparation activities for the review and assessment of digital I and C systems, which will have similar functions of the analog I and C systems in operation at ANGRA 2 NPP. (author)