Optimization of test and maintenance of ageing components consisting of multiple items and addressing effectiveness

There are many models in the literature that have been proposed in the last decades aimed at assessing the reliability, availability and maintainability (RAM) of safety equipment, many of them with a focus on their use to assess the risk level of a technological system or to search for appropriate design and/or surveillance and maintenance policies in order to assure that an optimum level of RAM of safety systems is kept during all the plant operational life. This paper proposes a new approach for RAM modelling that accounts for equipment ageing and maintenance and testing effectiveness of equipment consisting of multiple items in an integrated manner. This model is then used to perform the simultaneous optimization of testing and maintenance for ageing equipment consisting of multiple items. An example of application is provided, which considers a simplified High Pressure Injection System (HPIS) of a typical Power Water Reactor (PWR). Basically, this system consists of motor driven pumps (MDP) and motor operated valves (MOV), where both types of components consists of two items each. These components present different failure and cause modes and behaviours, and they also undertake complex test and maintenance activities depending on the item involved. The results of the example of application demonstrate that the optimization algorithm provide the best solutions when the optimization problem is formulated and solved considering full flexibility in the implementation of testing and maintenance activities taking part of such an integrated RAM model.

Effectiveness of soil and water conservation practices for pollution control /

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Bulletin - Department of Agricultural Technical Services.

Contains numbered sub-series of various institutes and stations.

Report of the Minister of Agriculture.

Report year ends June 30.

British breeds of live stock.

1st-2d ed. issued by the Board of Agriculture and Fisheries.

New York State agriculture and markets law. 1922-1962.

Kept up to date by Amendments, 1936-60; 1962, looseleaf.

Bulletin of the College of Agriculture, Tokyo Imperial University.

Volume for 1887-1890 issued by college under an earlier name: Imperial College of Agriculture and Dendrology.

Annual reports of the Department of Agriculture.

Also cited with sectional title: Report of the Secretary of Agriculture. Report of chiefs.

Biennial report - Wisconsin Department of Agriculture.

Report for 1954/55-1955/56 issued as Special bulletin no. 64.

Agricultural statistics, England and Wales /

Description based on: Pt. 1 (1939/44).

Annual report of the Department of Agriculture of the Province of New Brunswick for the year ended 31st October .

Title varies slightly.

The Journal of agriculture of the University of Puerto Rico.

Mode of access: Internet.

Demand-price-trade model of KASM3: technical documentation /

On cover: Korean Agricultural Sector Study.

The food products of Canada and names of some exporters.

Report by Jas. W. Robertson, Commissioner of Agriculture and Dairying.

Biennial report of the Department of Agriculture of the state of Washington to the Governor.

Issue for Sept. 30, 1932 has title: Tenth biennial report of the Department of Agriculture and fifth biennial report of the Department of Conservation and Development to the Governor.