A thermal hydraulic modelling for leak-before break applications

Jaakko Miettinen, Kari Ikonen, Rauli Keskinen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    A computer code named CRAFLO has been developed at VTT Energy for realistic leak rate analysis of leak-before-break applications. The code offers several alternative models and correlations to study the associated thermal hydraulic two-phase phenomena. Among them are energy nonequilibrium models with velocity slip between the phases. The leak rate is obtained via parallel solution of equations for conservation of mass, momentum and energy as integrated over the flow path through the wall thickness. A discretized formulation is provided as an option to yield detailed distributions of pressure and steam quality. Validation is going on and has shown fairly good comparison with the SQUIRT2 code and benchmark test results. The code has been linked with in-house made fracture mechanics analysis modules to enable automated leakage crack size evaluation by means of an integrated analysis system LBBCAL. An illustrative application is made to a BWR plant primary circuit piping with a postulated circumferential through wall crack.
    Original languageEnglish
    Title of host publicationFatigue and Fracture 1996
    Subtitle of host publicationPresented at the 1996 ASME Pressure Vessels and Piping Conference
    EditorsK. Yoon
    Place of PublicationNew York
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Print)978-0-7918-1770-4
    Publication statusPublished - 1996
    MoE publication typeA4 Article in a conference publication
    Event1996 ASME Pressure Vessels and Piping Conference - Montreal, Canada
    Duration: 21 Jul 199626 Jul 1996

    Publication series

    SeriesAmerican Society of Mechanical Engineers. Pressure Vessels and Piping Division. Publication PVP


    Conference1996 ASME Pressure Vessels and Piping Conference


    Dive into the research topics of 'A thermal hydraulic modelling for leak-before break applications'. Together they form a unique fingerprint.

    Cite this