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Tomographic reconstruction of subchannel void measurements of nuclear fuel geometries
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Tillämpad kärnfysik.
2015 (Engelska)Självständigt arbete på avancerad nivå (yrkesexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
Abstract [en]

The Westinghouse FRIGG loop in Västerås, Sweden, has been used to study the distribution of steam in the coolant flow of nuclear fuel elements, which is known as the void distribution. For this purpose, electrically heated mock-ups of a quarter BWR fuel bundles in the SVEA-96 geometry were studied by means of gamma tomography in the late 1990s. Several test campaigns were conducted, with good results, but not all the collected data was evaluated at the time. In this work, tomographic raw data of SVEA-96 geometry is evaluated using two different tomographic reconstruction methods, an algebraic (iterative) method and filtered back-projection. Reference objects of known composition (liquid water) are used to quantify the decrease in attenuation arising from the presence of the void, which is used to create a map of the void in the horizontal cross sections of the fuel at various axial locations. The resulting detailed void distributions are averaged over subchannels and the subchannel steam core for comparison with simulations. The focus of this work is on the void distribution at high axial locations in the fuel, in fuel bundles with part-length fuel-rods. Measurements in the region above the part-length rods are compared with simulations and the reliability of each method is discussed. The algebraic method is found to be more reliable than the filtered back-projection method for this setup. A reasonable agreement between measurements and predictions is shown. The void, in both cases, appears to be slightly lower in the corner downstream the part-length rods.

Ort, förlag, år, upplaga, sidor
2015. , s. 30
Serie
UPTEC F, ISSN 1401-5757 ; 15 007
Nyckelord [en]
tomography, void, nucler power, bwr
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:uu:diva-246288OAI: oai:DiVA.org:uu-246288DiVA, id: diva2:792706
Externt samarbete
Westinghouse Electric Sweden AB
Utbildningsprogram
Civilingenjörsprogrammet i teknisk fysik
Handledare
Examinatorer
Tillgänglig från: 2015-03-10 Skapad: 2015-03-04 Senast uppdaterad: 2015-03-10Bibliografiskt granskad

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