Resumo

RIVERO OLIVA, José de Jesús  e  PERDOMO OJEDA, Manuel. Influence of the periodic tests policy on the reliability of technological systems. Energética [online]. 2019, vol.40, n.2, pp. 148-157. ISSN 1815-5901.

The paper proposes a methodology for the construction and evaluation of fault trees for stand-by redundant systems, periodically tested, evaluating the influence of the periodic tests policy on the system unavailability, through a mean unavailability model. The comparison with the instantaneous unavailability analysis shows that the model adequately reflects the periodic tests policies, based on data usually recorded in nuclear power plants. The formula for calculating the components mean unavailability was generalized with the inclusion of test efficiency and test-caused degradation. The model was applied to the analysis of a simplified system, showing its effectiveness to evaluate policies and test intervals, with recommendations for the optimization of the latter. Its importance lies in the possibility of its integration into the general PSA model of the facility, instead of remaining as a separate and complementary evaluation.

Palavras-chave : periodic tests; fault trees; mean unavailability; instantaneous unavailability.

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