Showing papers in "Nuclear Engineering and Design in 1979"

TL;DR: In this article, a general and effective finite element formulation for analysis of nonlinear steady-state and transient heat transfer is presented, and the solutions of the incremental heat transfer equations are achieved using Newton-Raphson iteration, and in transient analysis using a one-step α-family time integration scheme.

TL;DR: In this article, the authors used a three-dimensional displacement-hybrid finite element method to determine the stress intensity factors for external and internal unpressurized and pressurized surface cracks in internally pressurized thick-walled reactor pressure vessels.

TL;DR: In this paper, a nonlinear finite element analysis of concrete structures is presented, including triaxial nonlinear stress-strain behavior, tensile cracking, compression crushing and strain-softening.

TL;DR: In this article, the degree of thermodynamic non-equilibrium, denoted by the ratio of actual quality to equilibrium quality, is correlated in terms of a dimensionless temperature difference which includes the superheated vapor temperature.

TL;DR: In this paper, a simple theory for the large deformation of a tube compressed diametrically between rigid plates is described, which enables the load-deflection curve, maximum tensile strain in the tube wall and other features of the deformation to be deduced.

TL;DR: An exact analysis of the effects of mass transfer and free convection currents on MHD Stokes' (Rayleigh's) problem for the flow of an electrically conducting, incompressible, viscous fluid past an impulsively started vertical plate, under the action of a transversely applied magnetic field is made in this article.

TL;DR: In this paper, the authors investigated the inter-subchannel mixing by turbulent diffusion and secondary flow between the parallel subchannels of ducts simulating smooth, bare rod bundles and reported experimental results.

TL;DR: In this article, an exact analysis of MHD Stokes problem for the flow of an electrically conducting, incompressible, viscous fluid past an impulsively started vertical plate, under the action of transversely applied magnetic field, is carried out.

TL;DR: In this paper, some criteria for comparing methods of solution of the inverse heat conduction problem were presented for comparing the accuracy when using exact data, insensitivity to measurement errors, and stability for small time steps.

TL;DR: In this paper, a new empirical formula is presented for the determination of projectile penetration into steel barriers, which can be used to determine the residual velocity of a projectile as it penetrates a barrier.

TL;DR: In this article, the authors used the Gosman integration procedure to predict the turbulent flow in three duct configurations simulating pitch to diameter ratios of 1.833, 1.375 and 1.1.

TL;DR: In this paper, a general set of integral equations and solutions have been obtained for the unavailability of standby components using general failure time, test duration and repair time distributions, and optimal testing/inspection intervals for practical inspection policies.

TL;DR: In this article, liquid slosh and tank wall flexural vibrations are studied in a flexible model storage tank subject to simulated earthquake environments, and an approximate analytical model for prediction of seismically induced stress is presented.

TL;DR: In this paper, a probabilistic three-degree-of-freedom trajectory model which includes drag, lift, and side forces has been developed to simulate rigid body dynamics in turbulent tornado flow fields.

TL;DR: In this paper, the authors formulated a simple model of a lithium-fall ICF and calculated the fall disassembly and the subsequent fluid-wall interaction resulting from the energy deposition by a laser-imploded fusion pellet.

TL;DR: In this article, an experimental study of subcooled and low quality film boiling for water in a vertical tube covering a mass flux range of 50−500 kg m−2 s−1 and an inlet subcooling range of 5−70°C is described.

TL;DR: In this paper, a conservative method is formulated to use this warm prestressing effect in the fracture mechanics analysis of nuclear pressure vessels under thermal shock, based on the assumption that a crack will not initiate when the stress intensity factor is dropping with time, whether or not the temperature is dropping.

TL;DR: In this article, a 61-tube wire-wrapped hexagonal bundle in a water flow loop was analyzed for both laminar and turbulent regions and the results showed that the increase in heat and momentum transfer resulting from the wire-wrap was more pronounced in the laminara region than in the turbulent region.

TL;DR: In this article, the impact of human errors on plant operation and safety is examined through the use of proper taxonomies of error, tasks and failures, including operator, maintenance, installation and administrative.

TL;DR: In this article, the effect of transient (non-steady) creep and orthotropic material on stress and strain distributions in rotating disks of orthotropic materials has been discussed and depicted graphically.

TL;DR: In this article, the effects of pulsed irradiation on point defect and void behavior at elevated temperatures were studied and it was found that point defects in pulsed tokamaks, θ-pinchs and inertial confinement fusion reactors (ICFR) display non-steady state behavior.

TL;DR: In this paper, the adsorption of Co 2+ on titanium oxide (TiO 2 ) has been experimentally evaluated as a function of temperatures in the range 20-280°C.

TL;DR: In this article, a solution of the optimization problem for longitudinal convective fins of constant thickness, triangular or parabolic profile, and uniform internal heat generation is presented. But the results are set forth in a non-dimensional form, which are presented graphically.

TL;DR: An analytical method for predicting the behavior of a prismatic high-temperature gas-cooled reactor (HTGR) core under seismic excitation has been developed in this paper, where blocks are treated as rigid bodies, are constrained by dowel pins which restrict relative horizontal movement but allow vertical and rocking motions.

TL;DR: In this paper, a mixed three dimensional formulation is presented for the analysis of thermally loaded thick plates, in which the three dimensional governing equations are derived from the elasticity equations by using a MacLaurin series approach and expressions for the components of displacement, stress, and heat flux as well as the temperature are obtained in a series form in terms of the linear partial differential operators operating on a set of initial functions, which are the solutions to the governing equations.

TL;DR: In this article, an experimental facility to simulate two-phase high-pressure flow phenomena using low-pressure Freon-113 has been built, commissioned, and employed to investigate the rewetting process of hot surfaces in a Freon 113 environment at pressures up to 5.43 bar.

TL;DR: In this paper, a temperature noise technique for the detection of local blockages in fast reactor subassemblies is discussed and the main factors involved in an assessment of the technique are outlined and the experimental and theoretical work that has been carried out at BNL on various aspects of the problem is described.

TL;DR: In this paper, the experimental and theoretical evidence on the behavior of spray fires in closed vessels is reviewed for applicability to LMFBR containment, and the experimental pressure and temperature increases approach those predicted from thermodynamic considerations alone.

TL;DR: In this paper, fast/epithermal neutron scattering techniques are used for void fraction measurement in two-phase flow and Monte Carlo neutron transport calculations are used to predict results in agreement with the measurements.

TL;DR: In this article, local velocity and turbulence intensity measurements were obtained with a laser Doppler anemometer near flow blockages in an unheated 7 × 7 rod bundle, and the experimental velocity results obtained with blockage clusters located midway between grid spacers were successfully predicted using the COBRA subchannel computer program.