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Investigation on the effect of eccentricity for fuel disc irradiation tests
Scolaro, A.,Van Uffelen, P.,Fiorina, C.,Schubert, A.,Clifford, I.,Pautz, A. Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.5
A varying degree of eccentricity always exists in the initial configuration of a nuclear fuel rod. Its impact on traditional LWR fuel is limited as the radial gap closes relatively early during irradiation. However, the effect of misalignment is expected to be more relevant in rods with highly conductive fuels, large initial gaps and low conductivity filling gases. In this paper, we study similar characteristics in the experimental setup of two fuel disc irradiation campaigns carried out in the OECD Halden Boiling Water Reactor. Using the multi-dimensional fuel performance code OFFBEAT, we combine 2-D axisymmetric and 3-D simulations to investigate the effect of eccentricity on the fuel temperature distribution. At the same time, we illustrate how the advent of modern tools with multi-dimensional capabilities might further improve the design and interpretation of in-pile separate-effect tests and we outline the potential of such an analysis for upcoming experiments.
Pietro Quaretti,Franco Galli,Lorenzo Paolo Moramarco,Riccardo Corti,Giovanni Leati,Ilaria Fiorina,Marcello Maestri 대한영상의학회 2014 Korean Journal of Radiology Vol.15 No.3
Central venous catheters are the most frequent causes of benign central vein stenosis. We report the case of a 79-yearold woman on hemodialysis through a twin catheter in the right internal jugular vein, presenting with superior vena cava (SVC) syndrome with patent SVC. The clinically driven endovascular therapy was conducted to treat the venous syndrome with a unilateral left brachiocephalic stent-graft without manipulation of the well-functioning catheter. The follow-up was uneventful until death 94 months later.