Title: A Quasi-Independence Model to Estimate Failure Rates
Authors: IHM P.
Citation: Reliability Engineering and System Safety vol. 21 p. 309-318
Publisher: Elsevier Publ.
Publication Year: 1988
JRC Publication N°: JRC5881
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC5881
Type: Articles in Journals
Abstract: GATE VALVES OF NUCLEAR PLANTS ARE CONSIDERED, AND TWO QUALITATIVE COVARIATES ARE TAKEN INTO ACCOUNT: PLANT LOCATION AND REACTOR SYSTEM. INDEPENDENCE BETWEEN THE TWO COVARIATES AND AN EXPONENTIAL FAILURE MODEL ARE ASSUMED. THE FAILURE RATE OF THE COMPONENTS OF A GIVEN SYSTEM AND PLANT IS ASSUMED TO BE A CONSTANT, BUT IT MAY VARY FROM ONE SYSTEM TO ANOTHER AND FROM ONE PLANT TO ANOTHER. THIS LEADS TO THE ANALYSIS OF A CONTINGENCY TABLE. A PARTICULAR FEATURE OF THE MODEL IS THE DIFFERENT OPERATING TIME OF THE COMPONENTS IN THE VARIOUS CELLS WHICH CAN ALSO BE EQUAL TO ZERO. THE CONCEPT OF INDEPENDENCE OF THE COVARIATES IS THEN REPLACED BY THAT OF QUASI-INDEPENDENCE. THE LATTER DEFINITION IS USED IN A BROADER SENSE THAN USUALLY. SUITABLE STATISTICAL TESTS ARE DISCUSSED AND A NUMERICAL EXAMPLE ILLUSTRATES THE USE OF THE METHOD.
JRC Institute:Joint Research Centre Historical Collection

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