Počet záznamů: 1  

Material effect in the nuclear fuel-coolant interaction: Analyses of prototypic melt fragmentation and solidification in the KROTOS facility

  1. 1.
    0434503 - ÚACH 2015 RIV US eng J - Článek v odborném periodiku
    Tyrpekl, V. - Piluso, P. - Bakardjieva, Snejana - Dugne, O.
    Material effect in the nuclear fuel-coolant interaction: Analyses of prototypic melt fragmentation and solidification in the KROTOS facility.
    Nuclear Technology. Roč. 186, č. 2 (2014), s. 229-240. ISSN 0029-5450. E-ISSN 1943-7471
    Institucionální podpora: RVO:61388980
    Klíčová slova: fuel-coolant interaction * melt fragmentation * KROTOS facility
    Kód oboru RIV: CA - Anorganická chemie
    Impakt faktor: 0.725, rok: 2014

    During a severe accident sequence in a pressurized light water reactor, the hot ( similar to 3000 K) molten materials (corium) coming from the degraded reactor core may generate a violent interaction if they come in contact with water. This melt-water interaction, called fuel-coolant interaction (FCI), may damage the structures and threaten the reactor integrity if there is a steam explosion. FCI occurs generally in two phases: a premixing phase, during which the molten corium jet is fragmented into large droplets and mixed with the water, and the explosion phase, during which the vapor film that has developed around the fuel droplets is destabilized and the droplets are finely fragmented. The presented work covers a set of experimental studies describing the morphology and nature of the solidified materials after interaction with water. Debris from experiments performed in the KROTOS (Commissariat a l' Energie Atomique, Cadarache, France); PREMIX, ECO (Karlsruhe Institute of Technology, Karlsruhe, Germany); and MISTEE (Royal Institute of Technology, Stockholm, Sweden) facilities have been characterized by metallographic, analytical, and microscopic techniques. These post-test analyses are able to provide important information on the solidification path and other main phenomena involved during FCI It was found that the behavior of metallic and oxide melts differs significantly from the standpoint of debris morphology. Oxide melts that underwent simple coarse fragmentation showed spherical or angular rocklike shape, unlike metallic melts. A statistical analysis was performed on the debris from the KROTOS tests; a data set of particles was described by the circularity, solidity, and porosity. The mechanism of water ingression (Kim and Corradini) inside the melt droplet was observed to be the key mechanism of fine (secondary) fragmentation.
    Trvalý link: http://hdl.handle.net/11104/0238524

     
     
Počet záznamů: 1  

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