Showing papers in "Nuclear Engineering and Design in 1972"

TL;DR: In this paper, a semi-empirical model was developed that can accurately predict pressure losses in a hexagonal array of fuel pins utilizing a wire-wrap spacer system, which is able to predict pressure drop to within ± 14 % over a wide range of geometries in the turbulent flow regime.

TL;DR: In this article, a mathematical model is proposed to describe the phenomena of parallel-flow-induced vibrations of a flexible rod, and a solution is obtained for a rod with arbitrary end conditions; the solution can be used for fixed, hinged, cantilevered and other elastically supported end conditions.

TL;DR: In this paper, a consistent formulation of the above mechanism based on surface thermodynamics is presented and the isotropic macroscopic stress-strain relations are derived, indicating the form of the dependence of material parameters on pore humidity and temperature, and restrict considerably the number of possible forms of constitutive equation that would have to be assumed on a purely phenomenological basis.

TL;DR: Simultaneous measurements of flow and enthalpy were made at the exits of two subchannels in a sixteen rod electrically heated full-scale model of a typical LWR fuel rod geometry.

TL;DR: In this article, a fifteen-step "Design by Reliability" methodology is presented and illustrated for synthesizing failure governing stress and strength distributions, and for calculating the associated reliability, and a method for determining the lower, one-sided confidence limit of the calculated reliability is given and illustrated.

TL;DR: In this article, an analysis of aircraft accidents is presented to establish the probability of an aircraft hitting a nuclear power plant, based on United States data, and new formulas are proposed to cover the range of parameters encountered in aircraft engine impact.

TL;DR: In this paper, a physical model for the rewetting of a hot dry patch is proposed, where the mechanisms governing the rate of resorption of the dry area are the conduction of heat from the dry to the wet area and the removal of this heat by a large local heat-transfer coefficient.

TL;DR: LIFE-II as mentioned in this paper provides a detailed thermal, radiation, and mechanical analysis of cylindrical fast-reactor fuel-element behavior as a function of actual reactor operating history.

TL;DR: In this paper, the fracture criterion of critical COD was verified by using the results of the burst tests in titanium and aluminum alloy cryogenic pressure vessels, and the model was applied to the analysis of experimental data obtained from flat plates and cylindrical shells under axial tension, internal pressure, and torsion.

TL;DR: In this paper, the basic UO 2 property data are presented and the effect of important variables such as density, temperature, stoichiometry, etc., are discussed in the context of their role in various fuel life-limiting mechanisms.

TL;DR: In this article, the authors calculated the stress, force and strain distributions produced in collapsed cladding by the expansion of cracked pellets during a power increase and showed that the tendency for the cladding to stretch preferentially over them is reduced by frictional sliding at the pellet/clad interface.

TL;DR: In this paper, the critical flow velocity at which the pipe loses stability has been computed for four end conditions, and it is shown that when the flow velocity exceeds a certain value, the conservative system becomes subject to buckling-type instability and the non-conservative system becoming subject to fluttering-type and buckling type instabilities.

TL;DR: In this article, a review of the developments of the last few years in both the fields of heat conduction in solids and of thermo-elasticity are reviewed, with comparatively less emphasis on those of primarily theoretical interest.

TL;DR: In this paper, the effect of collision-protective side structures installed in nuclear powered ships was analyzed. And the influence of the strength of a stem of a striking ship with strength ratio of stem to side structure and semi-experimental formulae of the energy absorption were obtained.

TL;DR: In this paper, a variational functional for the finite element method is derived by using the Lagrange multiplier method, which is a very general one and almost all the functionals ever used in finite element analysis are included as its special cases.

TL;DR: In this article, the application of the finite element method to linear and non-linear problems in pressure vessel technology is presented and new developments for dealing with components such as liners, prestressing cables and reinforcement are outlined.

TL;DR: In this paper, the general nature of the principles upon which earthquake resistant design is based is described with particular reference to components and elements of nuclear reactor facilities, and the response and design criteria of items of equipment or of components that are mounted on or attached to responding elements are developed to bound the dynamic response of such items.

TL;DR: A statistical approach to two-phase inertia forces leads to a mixing length theory in which different flow structures correspond to different flow regimes as discussed by the authors, which is used in conjunction with void and velocity profile data to examine developing and developed flow profiles for bubble and dispersed annular flows.

TL;DR: In this paper, the simplified hybrid displacement method for plate bending is given systematically with some extension made to allow for the discontinuity of deflection field, and eight types of finite elements are developed utilizing this principle.

TL;DR: In this paper, a procedure for determining the bubble-size distribution in an operating natural circulation BWR utilizing a digital type void meter and a bubble speed meter is described in detail.

TL;DR: Niobium and its alloys have been evaluated for a number of terrestrial and space nuclear powered system as discussed by the authors, and they have been developed which meet many of the requirements of long time, high temperature service.

TL;DR: In this paper, the analytical determination of stresses near cylinder-to-cylinder intersections is dealt with, and a survey of relevant literature is given, aimed at giving the reader an insight into existing possibilities and difficulties.

TL;DR: In this article, a model of the stress and deformation state in a high-temperature gas-cooled nuclear power plant is presented, which is based on the linear theory of elasticity.

TL;DR: In this paper, a three-dimensional matrix is used to represent the core, and the behavior of the hot assembly is determined by superimposing the power distribution among the assemblies upon the flow distribution while allowing for flow mixing between assemblies.

TL;DR: In this paper, the mechanical aspects of fuel cladding, especially the zircaloys' performance requirements under BWR and PWR conditions, are discussed, which are not greatly dissimilar.

TL;DR: In this paper, the authors proposed a model for the description of the processes occurring when molten fuel and coolant interact, where the reaction has been assumed to occur in two successive phases, which have been called respectively phase A and phase B.

TL;DR: In this paper, the authors discuss the effects of UO 2 on the integrity of the zircaloy cladding tube, particularly since the properties of this material are so adversely affected by irradiation.

TL;DR: In this paper, the authors describe boiling mechanisms at various flow conditions and provide verified heat-transfer correlations for water, focusing on the prediction of nucleate boiling, effect of surface fouling, and transient cooling.