RELIABILITY STUDY OF THE AUXILIARY FEED-WATER SYSTEM OF A PRESSURIZED WATER REACTOR BY FAULTS TREE AND BAYESIAN NETWORK

• Autor(a) principal: LAVA, Deise Diana
• Data de Publicação: 2017
• Outros Autores: BORGES, Diogo da Silva, GUIMARÃES, Antonio Cesar Ferreira, MOREIRA, Maria de Lourdes, Instituto de Engenharia Nuclear (IEN)
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional do IEN
• Texto Completo: http://carpedien.ien.gov.br:8080/handle/ien/2157
• topic: BAYESIAN NETWORK

This paper aims to present a study of the reliability of the Auxiliary Feed-water System (AFWS) through the methods of Fault Tree and Bayesian Network. Therefore, the paper consists of a literature review of the history of nuclear energy and the methodologies used. The AFWS is responsible for providing water system to cool the secondary circuit of nuclear reactors of the PWR type when normal feeding water system failure. How this system operates only when the primary system fails, it is expected that the AFWS failure probability is very low. The AFWS failure probability is divided into two cases: the first is the probability of failure in the first eight hours of operation and the second is the probability of failure after eight hours of operation, considering that the system has not failed within the first eight hours. The calculation of the probability of failure of the second case was made through the use of Fault Tree and Bayesian Network, that it was constructed from the Fault Tree. The results of the failure probability obtained were very close, on the order of 10-3.