Experimental investigation of natural-circulation flow behavior under low-power/low-pressure conditions in the large-scale panda facility

Olivier Auban, Domenico Paladino, Robert Zboray

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    Twenty-five tests have been carried out in the largescale thermal-hydraulic facility PANDA to investigate natural-circulation and stability behavior under low-pressure/low-power conditions, when void flashing might play an important role. This work, which extends the current experimental database to a large geometric scale, is of interest notably with regard to the start-up procedures in natural-circulation-cooled boiling water reactors. It should help the understanding of the physical phenomena that may cause flow instability in such conditions and can be used for validation of thermal-hydraulics system codes. The tests were performed at a constant power, balanced by a specific condenser heat removal capacity. The test matrix allowed the reactor pressure vessel power and pressure to be varied, as well as other parameters influencing the natural-circulation flow. The power spectra of flow oscillations showed in a few tests a major and unique resonance peak, and decay ratios between 0.5 and 0.9 have been found. The remainder of the tests showed an even more pronounced stable behavior. A classification of the tests is presented according to the circulation modes (from single-phase to two-phase flow) that could be assumed and particularly to the importance and the localization of the flashing phenomenon.

    Original languageEnglish (US)
    Pages (from-to)294-312
    Number of pages19
    JournalNuclear Technology
    Volume148
    Issue number3
    DOIs
    StatePublished - Jan 1 2004

    Fingerprint

    low pressure
    Hydraulics
    Boiling water reactors
    Power spectrum
    Pressure vessels
    Two phase flow
    boiling water reactors
    hydraulic equipment
    pressure vessels
    condensers
    two phase flow
    hydraulics
    Hot Temperature
    power spectra
    voids
    reactors
    heat
    oscillations
    causes
    decay

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • Nuclear Energy and Engineering
    • Condensed Matter Physics

    Cite this

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    Experimental investigation of natural-circulation flow behavior under low-power/low-pressure conditions in the large-scale panda facility. / Auban, Olivier; Paladino, Domenico; Zboray, Robert.

    In: Nuclear Technology, Vol. 148, No. 3, 01.01.2004, p. 294-312.

    Research output: Contribution to journalArticle

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