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  • 1. Le Corre, J. -M
    et al.
    Bergmann, U. C.
    Westinghouse Elect Sweden AB, Vasteras, Sweden..
    Hallehn, A.
    Westinghouse Elect Sweden AB, Vasteras, Sweden..
    Tejne, H.
    Westinghouse Elect Sweden AB, Vasteras, Sweden..
    Waldemarsson, F.
    Westinghouse Elect Sweden AB, Vasteras, Sweden..
    Morenius, Boel
    KTH, School of Engineering Sciences (SCI), Physics, Reactor physics and technology. SKB Swedish Nucl Fuel & Waste Management Co, Stockholm, Sweden..
    Baghai, R.
    RBI Instrumentat, Meylan, France..
    Measurements of local two-phase flow parameters in fuel bundle under BWR operating conditions2018In: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 336, p. 15-23Article in journal (Refereed)
    Abstract [en]

    The Westinghouse FRIGG facility, in Vasteras/Sweden, is dedicated to the measurement of critical power, stability and pressure drop in fuel rod bundles under BWR operating conditions (steady-state and transient). The facility is particularly relevant to test modern BWR fuel designs which typically have complex features, such as part-length rods and mixing vanes that make the flow heterogeneous and challenging to accurately simulate (e.g. using sub-channel analysis codes or CFD tools). In order to support the validation of advanced thermal-hydraulics codes for detailed BWR fuel assembly simulation, new local instrumentation techniques have been tested at the FRIGG facility for the measurement of two-phase dynamic pressure (Pitot tubes) and high time resolution phase detection (optical sensor). The optical sensors were custom-made by RBI Instrumentation for the FRIGG facility and optimized for annular two-phase flow (drop/steam) under BWR operating conditions. This new instrumentation was successfully tested and allows the first-time measurement, under BWR operating conditions, of relevant two-phase flow parameters such as the local void fraction in the steam core, the local drop/steam velocity, the volumetric interfacial area, the drop collision frequency and the assessment of drop size distribution during BWR steady-state and transient operations.

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