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Doctoral Thesis
DOI
https://doi.org/10.11606/T.85.2010.tde-30082011-105219
Document
Author
Full name
Valdir Maciel Lopes
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2010
Supervisor
Committee
Sordi, Gian Maria Agostino Angelo (President)
Deboni, José Eduardo Zindel
Madi Filho, Tufic
Perez, Clarice de Freitas Acosta
Rodrigues, Demerval Leônidas
Title in Portuguese
Incidentes em reatores nucleares de pesquisa examinados por análise de probabilidade determinística e análise  probabilística de  segurança
Keywords in Portuguese
APS
incidentes
IRSRR
pesquisa
reatores
Abstract in Portuguese
O presente trabalho tem o objetivo de avaliar os riscos potenciais apresentados pelos incidentes em reatores nucleares de pesquisa. Para o desenvolvimento do trabalho, duas bases de dados do Organismo Internacional de Energia Atômica, OIEA, foram usadas, o Incident Report System for Research Reactor e Research Reactor Data Base. Para este tipo de avaliação fez-se uso de Análise Probabilística de Segurança (APS), dentro de um limite de confiança de 90% e, Análise de Probabilidades determinística (APD). Para obtenção dos resultados dos cálculos de probabilidades por APS, utilizou-se a teoria e as equações sugeridas em documento da IAEA TECDOC - 636. O desenvolvimento dos cálculos das probabilidades por APS utilizou-se o Programa Scilab versão 5.1.1, de livre acesso, executável nas plataformas do Windows, Linux. Um programa específico para obter os resultados das probabilidades foi desenvolvido dentro do programa principal Scilab 5.1.1., para duas distribuições Fischer e Chi-quadrado, ambas no limite de confiança de 90%. Fazendo uso das equações de Sordi e do programa Origin 6.0, foram obtidas as doses máximas admissíveis relacionadas às probabilidades que satisfazem os limites de riscos estabelecidos pela Comissão Internacional de Proteção Radiológica, CIPR e, pode-se também obter estas doses máximas graficamente com a figura 1 resultante dos cálculos de probabilidades x doses máximas admissíveis. Verificou-se que a confiabilidade nos resultados das probabilidades está relacionada com a experiência operacional (reator x ano e fração) e, que quanto maior ela for, maior é a confiabilidade no resultado. Finalizando, sugere-se uma lista de futuros trabalhos que complementam este.
Title in English
Incidents in nuclear research reactor examined by deterministic probability and probabilistic safety analysis
Keywords in English
APS
incidents
IRSRR
reactors
research
Abstract in English
This study aims to evaluate the potential risks submitted by the incidents in nuclear research reactors. For its development, two databases of the International Atomic Energy Agency, IAEA, were used, the Incident Report System for Research Reactor and Research Reactor Data Base. For this type of assessment was used the Probabilistic Safety Analysis (PSA), within a confidence level of 90% and the Deterministic Probability Analysis (DPA). To obtain the results of calculations of probabilities for PSA, were used the theory and equations in the paper IAEA TECDOC - 636. The development of the calculations of probabilities for PSA was used the program Scilab version 5.1.1, free access, executable on Windows and Linux platforms. A specific program to get the results of probability was developed within the main program Scilab 5.1.1., for two distributions Fischer and Chi-square, both with the confidence level of 90%. Using the Sordi equations and Origin 6.0 program, were obtained the maximum admissible doses related to satisfy the risk limits established by the International Commission on Radiological Protection, ICRP, and were also obtained these maximum doses graphically figure1 resulting from the calculations of probabilities x maximum admissible doses. It was found that the reliability of the results of probability is related to the operational experience (reactor x year and fractions) and that the larger it is, greater the confidence in the outcome. Finally, a suggested list of future work to complement this paper was gathered.
 
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Publishing Date
2011-08-31
 
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