TAILIEUCHUNG - Development of a new method to determine the axial void velocity profile in BWRs from measurements of the in-core neutron noise

Determination of the local void fraction in BWRs from in-core neutron noise measurements requires the knowledge of the axial velocity of the void. The purpose of this paper is to revisit the problem of determining the axial void velocity profile from the transit times of the void between axially placed detectors, determined from in-core neutron noise measurements. | Progress in Nuclear Energy 138 2021 103805 Contents lists available at ScienceDirect Progress in Nuclear Energy journal homepage locate pnucene Development of a new method to determine the axial void velocity profile in BWRs from measurements of the in-core neutron noise Imre Pázsit a Luis Alejandro Torres b Mathieu Hursin c d Henrik Nylén e Victor Dykin a Cristina Montalvo b a Division of Subatomic High Energy and Plasma Physics Chalmers University of Technology SE 412 96 Göteborg Sweden b Universidad Politécnica de Madrid Energy and Fuels Department Ríos Rosas 21 28003 Madrid Spain c Paul Scherrer Institut Nukleare Energie und Sicherheit PSI Villigen 5232 Switzerland d Ecole Polytechnique Fédérale de Lausanne EPFL Switzerland e Ringhals AB SE-432 85 Väröbacka Sweden ARTICLE INFO ABSTRACT Keywords Determination of the local void fraction in BWRs from in-core neutron noise measurements requires the Void velocity profile knowledge of the axial velocity of the void. The purpose of this paper is to revisit the problem of determining Void fraction the axial void velocity profile from the transit times of the void between axially placed detectors determined BWR from in-core neutron noise measurements. In order to determine a realistic velocity profile which shows an Neutron noise inflection point and hence has to be at least a third order polynomial one needs four transit times and hence Transit time Local component five in-core detectors at various axial elevations whereas the standard instrumentation usually consists only Break frequency method of four in-core detectors. Attempts to determine a fourth transit time by adding a TIP detector to the existing four LPRMs and cross-correlate it with any of the LPRMs have been unsuccessful so far. In this paper we thus propose another approach where the TIP detector is only used for the determination of the axial position of the onset of boiling. By this approach it is sufficient to use only three transit .

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