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MULTIPHASE FLOW IN EX-VESSEL COOLABILITY: DEVELOPMENT OF AN INNOVATIVE CONCEPT
CORRADINI MICHAEL L. Korean Nuclear Society 2006 Nuclear Engineering and Technology Vol.38 No.1
The interaction and mixing of high-temperature melt and water is the important technical issue in the safety assessment of water-cooled reactors to achieve ultimate core coolability. For specific advanced light water reactor (ALWR) designs, deliberate mixing of the core-melt and water is being considered as a mitigative measure, to assure ex-vessel core coolability. The paper provides the background of past experiments as well as key fundamentals that are needed for melt-water interfacial transport phenomena, thus enabling the development of innovative safety technologies for advanced LWRs that will assure ex-vessel core coolability.
Master formulas for the dressed scalar propagator in a constant field
Ahmad, A.,Ahmadiniaz, N.,Corradini, O.,Kim, S.P.,Schubert, C. North Holland 2017 Nuclear Physics, Section B Vol.919 No.-
The worldline formalism has previously been used for deriving compact master formulas for the one-loop N-photon amplitudes in both scalar and spinor QED, and in the vacuum as well as in a constant external field. For scalar QED, there is also an analogous master formula for the propagator dressed with N photons in the vacuum. Here, we extend this master formula to include a constant field. The two-photon case is worked out explicitly, yielding an integral representation for the Compton scattering cross section in the field suitable for numerical integration in the full range of electric and magnetic field strengths.
One-particle reducible contribution to the one-loop spinor propagator in a constant field
Ahmadiniaz, N.,Bastianelli, F.,Corradini, O.,Edwards, J.P.,Schubert, C. North Holland 2017 Nuclear physics, B Vol.924 No.-
Extending work by Gies and Karbstein on the Euler-Heisenberg Lagrangian, it has recently been shown that the one-loop propagator of a charged scalar particle in a constant electromagnetic field has a one-particle reducible contribution in addition to the well-studied irreducible one. Here we further generalize this result to the spinor case, and find the same relation between the reducible term, the tree-level propagator and the one-loop Euler-Heisenberg Lagrangian as in the scalar case. Our demonstration uses a novel worldline path integral representation of the photon-dressed spinor propagator in a constant electromagnetic field background.
CRITICAL FLOW EXPERIMENT AND ANALYSIS FOR SUPERCRITICAL FLUID
Mignot, Guillaume,Anderson, Mark,Corradini, Michael Korean Nuclear Society 2008 Nuclear Engineering and Technology Vol.40 No.2
The use of Supercritical Fluids(SCF) has been proposed for numerous power cycle designs as part of the Generation IV advanced reactor designs, and can provide for higher thermal efficiency. One particular area of interest involves the behavior of SCF during a blowdown or depressurization process. Currently, no data are available in the open literature at supercritical conditions to characterize this phenomenon. A preliminary computational analysis, using a homogeneous equilibrium model when a second phase appears in the process, has shown the complexity of behavior that can occur. Depending on the initial thermodynamic state of the SCF, critical flow phenomena can be characterized in three different ways; the flow can remain in single phase(high temperature), a second phase can appear through vaporization(high pressure low temperature) or condensation(high pressure, intermediate temperature). An experimental facility has been built at the University of Wisconsin to study SCF depressurization through several diameter breaks. The preliminary results obtained show that the experimental data can be predicted with good agreement by the model for all the different initial conditions.
Stratified Steam Explosion Energetics
HangJin Jo,Jun Wang,Michael Corradini 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.1
Vapor explosions can be classified in terms of modes of contact between the hot molten fuel and thecoolant, since different contact modes may affect fuel-coolant mixing and subsequent vapor explosionenergetics. It is generally accepted that most vapor explosion phenomena fall into three different modesof contact; fuel pouring into coolant, coolant injection into fuel and stratified fuel-coolant layers. In thisstudy, we review previous stratified steam explosion experiments as well as recent experiments performedat the KTH in Sweden. While experiments with prototypic reactor materials are minimal, we donote that generally the energetics is limited for the stratified mode of contact. When the fuel massinvolved in a steam explosion in a stratified geometry is compared to a pool geometry based ongeometrical aspects, one can conclude that there is a very limited set of conditions (when melt jetdiameter is small) under which a steam explosion is more energetic in a stratified geometry. However,under these limited conditions the absolute energetic explosion output would still be small because thetotal fuel mass involved would be limited
Francesca Bresciani,Marco Pietra,Sara Corradini,Massimo Giunti,Federico Fracassi 대한수의학회 2014 Journal of Veterinary Science Vol.15 No.2
In human medicine, diagnosis of diabetic ketoacidosis(DKA) is usually based on measurement of capillary3-β-hydroxybutyrate (3-HB) with a hand held ketonesensor. This study was conducted to determine ifmeasurement of capillary 3-HB could be useful for thediagnosis and monitoring of canine DKA. Fifteen dogs withdiabetic ketosis and 10 with DKA were evaluated. Pairedmeasurements of 3-HB of capillary and venous bloodsamples were analysed by the electrochemical sensor andreference method. Use of capillary 3-HB measurementduring DKA management was then evaluated throughsimultaneous measurements of capillary 3-HB, urinaryAcAc and venous blood gas analysis. Good agreementbetween capillary and venous 3-HB measurement wasdetected by the electrochemical sensor and referencemethod. Monitoring treatment of DKA revealed asignificant correlation between capillary 3-HB and acidosismarkers, while no significant correlation was observedbetween AcAc and acidosis markers. A cut-off value ofcapillary blood 3-HB >3.8 mmol/L for diagnosis of DKAresulted in 70% and 92% sensitivity and specificity. Theelectrochemical sensor accurately measures 3-HBconcentration in both capillary and venous blood samples, isaccurate in diagnosing canine DKA, and appears to reflectthe patient’s metabolic status during DKA treatment.
Evaluation of critical heat flux of ATF candidate coating materials in pool boiling
Jo, HangJin,Yeom, Hwasung,Gutierrez, Emilio,Sridharan, Kumar,Corradini, Michael North-Holland Pub. Co 2019 Nuclear engineering and design Vol.354 No.-
<P><B>Abstract</B></P> <P>The critical heat flux (CHF) of potential accident tolerant fuel (ATF) cladding materials and concepts, Cr and FeCrAl coatings on zirconium-alloy substrates, was investigated experimentally. A cold spray process, which involves the propulsion of high velocity powder particles on to the substrate surface to form a coating upon impact, was used to create the coatings. Surface parameters such as contact angle, surface roughness, and morphology that are associated with CHF in pool boiling were characterized. Non-hydrodynamic effects of newly developed ATF candidate coating materials on CHF were also evaluated. The effects of thermal properties and coating thickness and expected challenges for evaluation of CHF for new ATF cladding materials development are discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Evaluating critical heat flux (CHF) on accident tolerant fuel cladding designs. </LI> <LI> Analyzing CHF with surface characteristics. </LI> <LI> Discussing non-hydrodynamic effects on CHF for nuclear cladding designs. </LI> </UL> </P>