Avaliação probabilística de segurança de projetos de sistemas elétricos de instalações nucleares

Abstract

This work presents a methodology for safety assessing of electric power systems design in nuclear installations. The methodology adopts core damage frequency as the main risk measure to evaluate distinct configurations of electric power systems of a nuclear installation, subsidizing design selection and installation licensing. One of the motivations of this work is the lack of a normative basis specific to the design of nuclear facilities that differ from conventional nuclear power plants design basis. Functional and operational particularities of non-conventional nuclear facilities tend not to be considered when conventional standards are adopted in the normative basis, leading to the application of criteria that are often overestimated and resulting in an increase in the financial risk of project deployment. In these cases, probabilistic safety analyses may be essential tools for the design and licensing of nuclear facilities. As a case study, the analysis of a non-conventional nuclear installation with naval applications was performed using CAFTA software, and modeling and quantification of safety systems failures in plant shutdown mode during the refueling outage were carried out. This study highlights the comparative analysis of possible configurations of electrical systems and their impact on the overall installation risk. As a result, it is recommended to review the normative basis in terms of the functional particularities of non-conventional nuclear installations with naval applications.