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ST 4.1 –
Seguridad nuclear
METHODOLOGY TO ANALYSIS OF AGING PROCESSES OF
CONTAINMENT SPRAY SYSTEM
da Silva Borges, Diogo; Lava, Deise Diana; Moreira, Maria de Lourdes;
Ferreira Guimarães, Antonio Cesar;
Instituto de Engenharia Nuclear. Brasil.
* Responsible author, email: diogofisica@ymail.com
This paper presents a contribution to the study of aging process of components in commercial
plants of Pressurized Water Reactors (PWRs). The motivation for write this work emerged from
the current perspective nuclear. Numerous nuclear power plants worldwide have an advanced
operating time. This problem requires a process to ensure the confiability of the operative
systems of these plants, because of this, it is necessary a methodologies capable of estimate
the failure probability of the components and systems. In addition to the safety factors involved,
such methodologies can to be used to search ways to ensure the extension of the life cycle of
nuclear plants, which inevitably will pass by the decommissioning process after the operating
time of 40 years. This process negatively affects the power generation, besides demanding an
enormous investment for such. Thus, this paper aims to present modeling techniques and
sensitivity analysis, which together can generate an estimate of how components, which are
more sensitive to the aging process, will behave during the normal operation cycle of a nuclear
power plant.