Simulation of the primary circuit breaks in the training simulator

Markku Hänninen, Jaakko Miettinen

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


    The pressurized water reactors (PWR) have been designed to operate in the way that normally there is only one-phase liquid in the primary circuit. In the primary break accidents, however, the primary pressure decreases as a consequence of the coolant discharge and a two-phase condition may occur. Large computer codes like RELAP5 and TRAC, which consume lots of computer time, are used for the simulation of reactor systems in small break loss of coolant accidents (SBLOCA). The full-scope training simulator of the Loviisa pressurized water reactor has been improved by backfitting a two-phase model SMABRE to the simulator. The two-phase model is necessarily needed when the primary circuit breaks are simulated. The basic physical models in the SMABRE are similar to those in the large simulation codes, but making some simplifications the real time simulation on a PDP-11/70 computer is possible. Two nodalization models, one with 26 volumes and the other with 61 volumes, have been applied in the training simulator. The main reason for the use of the more detailed model is the need to take into account the variations of primary loop elevations.
    Original languageEnglish
    Title of host publicationSimulation for nuclear reactor technology
    Subtitle of host publicationProceedings of the international conference
    EditorsD.G. Walton
    PublisherCambridge University Press
    ISBN (Print)978-0-521-26785-4
    Publication statusPublished - 1984
    MoE publication typeA4 Article in a conference publication
    EventInternational Conference on Simulation for Nuclear Reactor Technology - Cambridge, United Kingdom
    Duration: 9 Apr 198411 Apr 1984


    ConferenceInternational Conference on Simulation for Nuclear Reactor Technology
    Country/TerritoryUnited Kingdom


    Dive into the research topics of 'Simulation of the primary circuit breaks in the training simulator'. Together they form a unique fingerprint.

    Cite this