RBI and probabilistic life assessment for components of coal and co-fired power plants

Pertti Auerkari, Rami Pohja, Sanni Yli-Olli, Satu Tuurna, Pekka Pohjanne, Ulla McNiven

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific


    Risk-based inspection (RBI) is not always applied in power plants that are generally not seen to carry similar safety and other hazards as e.g. some branches of the chemical industry. Hence the supporting standardization, industrial guidelines and available services for RBI activities have not been as well established in the power industry. Such support has been addressed for example in the European projects RIMAP, iNTeg-Risk and SafeLife-X, with results that include recommendations towards the evolving European standardization on risk-based assessments. This paper aims to explore the benefits of probabilistic life assessment in supporting RBI and related maintenance planning. The details in the input information, including the progression rates of the active damage mechanisms, will affect the associated uncertainty in the probability of failure, predicted minimum life, and the resulting conclusions on next inspections. However, successful probabilistic treatment of the input information can allow realistic treatments of the models for the indicated or postulated damage mechanisms, and by using for example Monte Carlo approach, the outcome prediction is not sensitive to the mathematical formulation of the individual or combined damage mechanism models. The examples have been selected from components subjected to high temperature service in applications where one can expect unavoidable damage accumulation in long term operation, and/or multiple mechanisms affecting the component life. Implications are discussed in terms of implementation in RBI and other aspects of managing the assets.
    Original languageEnglish
    Title of host publicationProceedings of the 41st MPA-Seminar
    PublisherMaterials Testing Institute University of Stuttgart MPA
    Number of pages11
    Publication statusPublished - 2015
    MoE publication typeB3 Non-refereed article in conference proceedings
    Event41st MPA-Seminar: Fit for Future - Material Qualification, Lifetime Assessment evolving from New Energy Supply Concepts - Stuttgart, Germany
    Duration: 5 Oct 20156 Oct 2015
    Conference number: 41


    Seminar41st MPA-Seminar


    • risk-based inspection (RBI)
    • life assessment
    • power plant


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