Showing papers in "Progress in Nuclear Energy in 2012"

TL;DR: In this article, the authors focus more strongly on evaluating Gen IV cladding materials, e.g., SiCf/SiCm composites, for Gen III fuel, and show that the cost of electricity will be higher than for a Gen III LWR operating on a once-through fuel cycle, comparing the true, unsubsidized economic bottom line.

TL;DR: In this article, the authors used the Monte Carlo method to calculate the photon detection efficiency and energy resolution curves for a 1.5″ × 1.1″ NaI(Tl) scintillator detector (crystal+housing+photomultiplier tube material equivalent) exposed to gamma rays in the energy range from 20-kV to 662kV.

TL;DR: Simulation results show that the proposed controller for the load-following operation is quite effective while the constraints are robustly kept satisfied, and the controller imposes restricted state constraints on the predicted trajectory during optimization.

TL;DR: In this paper, a computer model is developed to simulate the diffusion of reactants through the fiber preform, and SiC deposition on the fiber surfaces, in order to better understand the densification of the composites.

TL;DR: In this article, an APT was employed to study the precipitation of solutes, primarily copper, nickel, manganese and silicon within the matrix and at grain boundaries, in irradiated RPV steels.

TL;DR: In this article, the authors investigated the influence of the MOD3.3 code on the two-phase flow instability in the RELAP5/MOD3.5 code and concluded that the influence on stability of the bypass area is examined.

TL;DR: In this paper, the spatial distribution, morphology, structure and chemical composition of different precipitates and inclusions in 9%Cr reduce activation ferritic-martensitic steel known as EUROFER 97 has been studied using transmission electron microscopy (TEM).

TL;DR: In this article, the authors used the best estimate code RELAP5/MOD3.2 to predict the transient natural circulation characteristics under single-phase and two-phase conditions, thresholds of flow instability, amplitude and frequency of flow oscillations for different operating conditions of the loops.

TL;DR: In this paper, the mass changes of Alloy 625 samples were analyzed in supercritical water (SCW) environments with 8.3ppm dissolved oxygen at 400 and 600°C and 24.8MPa (3600psi) for various periods of time up to 1000h.

TL;DR: In this paper, the energy conversion in magnetically confined plasma reactors is addressed and the chamber wall surrounding the plasma is built from the plasma facing components and from the blanket and divertor modules where the fusion energy is converted into the thermal energy, tritium is produced, and the external components of the chamber are shielded from radiation.

TL;DR: In this paper, a multiphysics framework that tightly couples the various physical models using the Jacobian-free Newton-Krylov technique (JFNK) is presented.

TL;DR: In this article, experimental studies on water film falling and spreading on a large vertical flat plate are carried out, and the experiments aim at investigating the flow characteristics of a falling film.

TL;DR: This modelling is performed in two volumes method in AP1000 reactor which is one of the most sophisticated safe reactors that has ever been built and the results are compared with the AP1000 safety, security and environmental reports.

TL;DR: In this article, the effect of irradiation on the deformation mechanism of zirconium alloys cladding tubes containing the fuel of pressurized water nuclear reactors was studied.

TL;DR: In this article, the preparation of a synthetic uranothorite with desired formula Th 0.5 U 0.43 SiO 4 was performed under hydrothermal conditions from a mixture of tetravalent thorium and uranium in hydrochloric solution with sodium metasilicate.

TL;DR: In this article, the authors considered the loss of flow accident (LOFA) in a typical MTR reactor undergoing partial and full blockage under the average channel condition and showed that boiling is inevitable for even small blockage ratios.

TL;DR: In this paper, the authors present a framework of the two-group interfacial drag, which models spherical/distorted bubbles (group-1) and cap/slug/churn-turbulent bubbles separately, is presented.

TL;DR: In this article, a 2D analysis of the fast loss-of-flow accident in the IAEA 10MW generic research reactor is conducted under the hot channel condition with one channel subject to a sequence of area contractions up to 80%.

TL;DR: In this article, an improved model based on microscopic mechanism of bubble dynamics is developed with the liquid sublayer dryout mechanism which has been well investigated by the previous researchers, and the effects of accelerations induced by channel motions in both the flow direction and the normal direction to the heated wall are investigated.

TL;DR: In this article, the use of thorium in pressurized water reactor fuel assemblies is investigated, and a fuel design primarily intended to control the excess of reactivity at beginning of life, and flatten the intra-assembly power distribution is presented.

TL;DR: In this article, the RELAP5/MOD3.3 code is modified by adding a module calculating the effect of rolling motion and introducing new flow and heat transfer models to simulate the natural circulation in rolling motion.

TL;DR: An adaptive estimator-based dynamic sliding mode control method is developed for the level control problem of steam generators and exhibits the desired dynamic properties during the entire output tracking process independent of perturbations.

TL;DR: In this paper, a method to quantify the helium distribution in the SiC f /SiC composites, which are used as the first-wall materials of fusion reactor, was reported.

TL;DR: A new and reasonable model for the passive residual heat removal heat exchanger (PRHR HX) was proposed based on basic equations of mass, momentum and energy and compared with that by Westinghouse-developed LOFTRAN code.

TL;DR: Human error analysis (HEA) procedures for a predictive analysis of human error potentials when maintenance personnel perform test or maintenance actions based on a work procedure or work plan are presented in this paper.

TL;DR: In this paper, the authors examined the long-term environmental performance of a geological repository that houses all of the final PyroGreen-produced wastes while describing the feasibility of PyroGreen partitioning and transmutation.

TL;DR: In this article, a numerical analysis of the neutron density behavior when the nuclear reactor power is increased during startup of a PWR was presented, where the fractional neutron point kinetic (FNPK) equation with one-group delayed neutron precursor and external neutron source was used for this analysis.

TL;DR: In this article, the authors describe key aspects of the Lithuania's national policy and strategy in radioactive waste management, legislative and financing systems, and the main emphasis is given to the progress in the progress of radioactive waste waste management practices.

TL;DR: TACOS (Transient Analysis Code Of SCWR) code has been developed to analyze the safety characteristics of SCWR-M for present work as mentioned in this paper, and preliminary analysis of loss of flow accident (LOFA) has been performed.

TL;DR: In this paper, a matlab model is developed to study the thermal behavior of a droplet during processing inside a microwave resonant cavity, taking into account the most relevant parameters (size of droplet, thermal properties of the solution, heat and mass transfer) and calculates the temperature profile inside the droplet.