Assessment of APROS against the Loviisa-2 stuck-open turbine by-pass valve transient

Eija-Karita Puska, Markku Hänninen, Kari Porkholm, Harri Kontio

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


    The goal of this paper is to present the capability of APROS plant analyzer to simulate real plant thermal hydraulic transients and to discuss the factors affecting the speed and accuracy of the analysis. The Loviisa-2 stuck-open turbine by-pass valve transient, also known as the primary circuit overcooling transient, is one of the very few unplanned real plant transients that have taken place in the Loviisa units. It took place on September 1, 1981. The emphasis in this transient is on the thermal hydraulic behavior. The plant measurement data has been previously used in the assessment of RELAP5/MOD2 code. This transient has been used also in an earlier assessment of APROS that has less extensive and resulted in some discrepancies between data and code predictions. Now the transient has been analyzed with various model combinations of APROS and good results in comparison with measurement data have been obtained.
    Original languageEnglish
    Title of host publicationPower plant transients 1994
    Subtitle of host publicationCONF-941142-
    VolumeFED-Volume 204
    Publication statusPublished - 1994
    MoE publication typeA4 Article in a conference publication
    EventAmerican Society of Mechanical Engineers` winter annual meeting - Chicago, United States
    Duration: 6 Nov 199411 Nov 1994


    ConferenceAmerican Society of Mechanical Engineers` winter annual meeting
    Country/TerritoryUnited States


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