Showing papers in "Nuclear Engineering and Design in 2004"

TL;DR: In this article, a literature survey is devoted to the problem of heat transfer of fluids at supercritical pressures including near critical region, and a discussion on the general trends of various thermophysical properties at near critical and pseudocritical points is also included.

TL;DR: The International Reactor Innovative and Secure (IRIS) as discussed by the authors is an integral, modular, medium size (335 MWe) PWR, which has been under development since the turn of the century by an international consortium led by Westinghouse and including over 20 organizations from nine countries.

TL;DR: The temperature dependence of graphite IG-11, used in the HTR-10, was investigated by thermogravimetric analysis in the temperature range of 400-1200°C.

TL;DR: In this article, an experimental facility made of glass and fluorine resin for a closed-loop continuous hydrogen production has been operated, and hydrogen production at the rate of 32 l/h for 20h was successfully accomplished.

TL;DR: The reduction in turbulent, convective heat transfer parameters observed in some supercritical data and in experiments with common gases can be due to radial property variation, acceleration, buoyancy or combinations of these phenomena, depending on the conditions of the applications.

TL;DR: In this article, the authors presented the modeling of bubble interaction mechanisms in the two-group interfacial area transport equation (IATE) for confined gas-liquid two-phase flow.

TL;DR: In this paper, a self-supporting planar electrolysis cell with a practical size (80mm × 80mm of electrolysis area) was fabricated to improve hydrogen production performance.

TL;DR: In this paper, a mathematical and computational model for predicting changes in temperature, moisture content and pore pressure in concrete at elevated temperatures is presented, where a pair of differential equations for one-dimensional heat and moisture transfer in concrete are derived from the conservation of energy and mass.

TL;DR: In this paper, a carbon dioxide (CO 2 ) gas turbine with a partial pre-cooling cycle attains comparable cycle efficiencies of 45.8% at medium temperature of 650°C and pressure of 7MPa with a typical helium (He) gas turbine reactor of GT-MHR (47.7%) at high temperature of 850°C.

TL;DR: In this paper, the authors provide biaxial failure behavior characteristics of concrete of a standard Korean nuclear containment building, the concrete specimens with the dimensions of 200 mm ×200 mm ×60 mm were tested under different baoxial load combinations.

TL;DR: In this article, a literature survey is devoted to hydraulic resistance of water and carbon dioxide flows at supercritical pressures, where the authors assess previous studies that were done in the area of hydraulic resistance and understand the specifics of pressure drop at these conditions.

TL;DR: In this article, the authors described the derivation of the equation for evaluating the strength of steel plate reinforced concrete structure and the experimental results of SC panels subjected to in-plane shear.

TL;DR: The first criticality was attained on November 10, 1998 and the rated power operation with the reactor outlet coolant temperature of 850 °C was achieved on December 7, 2001 as mentioned in this paper.

TL;DR: The European Pressurized Water Reactor (EPR) has adopted and improved the defense-in-depth approaches of its predecessors, the French “N4” and the German “Konvoi” plants Beyond the corresponding evolutionary changes, the EPR includes a new, 4th level of defense in depth that is aimed at limiting the consequences of a postulated severe accident with core melting as discussed by the authors.

TL;DR: In this paper, a two-group IATE was proposed to dynamically solve the interfacial area concentration in the two-fluid model, which was evaluated in steady-state, one-dimensional (1D) form.

TL;DR: In this article, the high-temperature oxidation kinetics of zircaloy (Zry) are evaluated and a reasonable base of combined data is identified, for a moment with certain uncertainty, which is not suitable for direct application.

TL;DR: In this paper, the design originalities of the GTHTR300 are a horizontally mounted highly efficient gas turbine system and an ultimately simplified safety system such as no containment building and no active emergency core cooling.

TL;DR: In this paper, a theoretical model has been developed to study the local heat transfer coefficient of a condensing vapour in the presence of a non-condensable gas, where the gas/vapour mixture is flowing downward inside a vertical tube.

TL;DR: In this paper, a hydrogen production system using high-temperature gas-cooled reactors (HTGRs) is presented. But the authors focus on the hydrogen production cycle, the IS (iodine-sulfur) process, in which heat supplied by HTGRs can be consumed for the thermal driving load.

TL;DR: In this article, the authors provide experiences and current status of research and development works for the high temperature gas-cooled reactors (HTGRs) fuel in the HTTR Project, and for upgrading of HTGR technologies, an extended burnup TRISO-coated fuel particle and an advanced type of coated fuel particle in order to keep the integrity at higher operating temperatures has been developed.

TL;DR: In this paper, the mechanisms of the thermal behavior of catalytic plate-type recombiners are analyzed and experimental results on existing and innovative devices for hydrogen removal introducing the modular recombiner concept.

TL;DR: In this article, the axial variation of film flow rate in annular regime was analyzed to predict the critical heat flux in water saturated flow boiling in various vertical channels, and the predicted results were compared with extensive data of critical heat flow flux in flow boiling.

TL;DR: In this article, a finite element formulation for the fully coupled dynamic equations of motion to include the effect of fluid-structure interaction (FSI) is introduced and applied to a pipeline system used in nuclear reactors.

TL;DR: In this paper, the authors presented an improved method for calculating the time histories of torsional and rocking components of ground motion corresponding to a set of three recorded orthogonal translational components.

TL;DR: In this paper, an innovative laser joining technology that allows the firm vacuum gas tight binding between any shaped bodies made of these ceramic materials is described, based on a solder that is specially made from Al 2O3, Y2O3 and SiO2 and melted locally in the joining zone by use of laser radiation.

TL;DR: In this article, a methodological and structured procedure to address the uncertainties related to passive safety functions is presented, where two hazard identification used qualitative methods, as failure mode and effect analysis (FMEA) and hazard and operability study (HAZOP), are utilized and the relative results compared in order to assess the main sources of physical failure.

TL;DR: The three leading severe accident codes used in the U.S., MELCOR, MAAP4 and SCDAP/RELAP5, are compared in this paper as part of an evaluation of the relative state of severe accident modeling in each of the codes.

TL;DR: In this article, an extensive experimental study of the mechanical properties and fracture properties of heavy concrete used mostly in the construction of radiation shielding structures is presented; the mixtures considered herein are developed according to the one adapted in the Kuosheng nuclear power plant in Taiwan; tests of the basic mechanical characteristics properties conform to the ASTM and the fracture properties are determined by the method proposed by Karihaloo and Nallathambi.

TL;DR: In this paper, a high-speed video camera was used to obtain the visualized information of the fragmentation and boiling phenomena during a core disruptive accident (CDA) in a Fast Breeder Reactor.