Determination of thermal-hydraulic loads on reactor internals in a DBA-situation

Ville Lestinen, Timo Toppila, Antti Timperi, Timo Pättikangas, Markku Hänninen

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

    3 Citations (Scopus)


    According to Finnish regulatory requirements, reactor internals have to stay intact in design basis accident (DBA) situations, so that control rods can always penetrate into the core. This is the basic motivation to study and develop more detailed methods for analyses of thermal-hydraulic loads on reactor internals during the DBA situation. In this work, the studied accident situation is Large Break Loss of Coolant Accident (LBLOCA). The objective of this work is to connect thermal-hydraulic and mechanical analysis methods with the goal to produce a reliable method for determination of thermal-hydraulic and mechanical loads on reactor internals in the accident situation. In the present model, the downcomer of a PWR is only included and the reactor internals will be added later. The tools studied are thermal-hydraulic system codes, computational fluid dynamics (CFD) codes and finite element analysis (FEA) codes. Both thermal-hydraulic and mechanical aspects are discussed in this paper. Firstly, the pressure boundary condition in the pipe break point was calculated with the system code. In the second step, CFD analyses were made. Finally, the full fluid-structure interaction coupling between the CFD and FEA codes was used.
    Original languageEnglish
    Title of host publicationASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference Proceedings
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Print)0-7918-4755-1
    Publication statusPublished - 2006
    MoE publication typeA4 Article in a conference publication
    EventASME Pressure Vessels and Piping Conference, PVP 2006: Held jointly with the 11th International Conference on Pressure Vessel Technology, ICPVT-11 - Vancouver, Canada
    Duration: 23 Jul 200627 Jul 2006


    ConferenceASME Pressure Vessels and Piping Conference, PVP 2006


    • Large-Break LOCA
    • LBLOCA
    • loss of coolant accident
    • PWR
    • fluid-structure interaction
    • FSI


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