Showing papers in "Nuclear Engineering and Design in 1977"

TL;DR: In this article, a constitutive law for plastic material response under stress reversals is shown to apply to materials with a vanishing elastic region, and the concept of the bounding surface introduced earlier, replaces the vanished yield and loading surfaces in defining loading-unloading criteria.

TL;DR: In this article, the influence of test section orientation on boiling crisis occurring in a tube has been studied experimentally, and the same tube was tested with both water and Freon-12 to determine the effects of fluid properties and the applicability of vertical fluid-to-fluid modelling criteria to horizontal flow.

TL;DR: In this paper, the effects of varying the friction, damping, tube/annulus stiffness and clearance on the r.m.s. contact forces were studied with two-dimensional sinusoidal excitation in air.

TL;DR: In this paper, the importance of component reliability prediction and its impact on management decision making has increased dramatically with the advent of new technologies, legal considerations, and design and economic factors, and these ideas and circumstances have contributed significantly to the development of such reliability-oriented concepts as "Retirement-for-Cause" (RFC).

TL;DR: Computational algorithms for the analysis of fluid and structural dynamics are reviewed, with particular emphasis on methods that are employed or of potential benefit in reactor safety analysis, where coupled fluid-structure analyses are of interest.

TL;DR: In this article, a computer-oriented analytical method for predicting the rewetting rate of a hot dry wall is proposed, which is modeled as a thin flat plate with internal heat generation, receives a variable heat flux from one side while it is cooled from the other side.

TL;DR: In this paper, the first two moments of the top event existence probability are used to estimate confidence bounds by several approaches which are based on standard inequalities (e.g. Tchebycheff, Cantelli, etc.) or on empirical distributions (the Johnson family).

TL;DR: In this paper, the design of the HDR-experiments and the accompanying program of computer code development is discussed, and the feedback of the structural deformations on the blowdown loading is taken into account.

TL;DR: In this article, a finite element displacement formulation based on Reissner's thick plate theory is presented for the bending analysis of annular and sector plates, and an annular element with six and twenty degrees of freedom, respectively, are developed.

TL;DR: In this paper, an influence function method for calculating stress intensity factors and residual fatigue life for two-and three-dimensional structures with complex stress fields and geometries is presented.

TL;DR: In this article, an electrolytic tracer was employed in conjunction with an isokinetic sampling technique which permitted mixed mean subchannel concentrations and flowrates to be measured without incurring errors resulting from local subchannel gradients.

TL;DR: In this paper, a method to determine floor response sepctra is proposed which is based on the modal analysis of a support structure with interaction-free, one-degree-of-freedom system attached.

TL;DR: In this paper, a number of new sodium fire and aerosol experiments were undertaken to provide data for LMFBR safety analyses: (1) Experiments on the burning of single drops of liquid sodium falling in air have been performed to aid in model development for sodium spray fire codes.

TL;DR: In this article, a procedure for the seismic design of column sections subjected to combinations of axial force and moments which probalistically can occur simultaneously is presented, and the procedure is extended to column sections.

TL;DR: In this paper, the stable explicit algorithm of Saul'ev is extended to the finite element heat conduction transient analysis, which can be applied to both finite difference and finite element analysis in any number of spatial dimensions.

TL;DR: In this paper, a comprehensive and standarized set of equations to calculate component unavailability and component failure intensity has been obtained in the case of the repair and inspection policies which are usually not in practice.

TL;DR: Comparisons show that the more approximate methods underpredict the dynamic buckling loads for this problem, and some basic assumptions of the simpler solutions are found to be invalid.

TL;DR: The Direction Centrale du Genie has been red to carry out perforation tests on slabs, at the scale of one-half as mentioned in this paper, with the help of the national Navy equipment (guneery base and gun).

TL;DR: In this paper, a state-of-the-art review identifies and discusses existing methods of flow-induced vibration analysis applicable to steam generators, their limitations and base-technology needs.

TL;DR: A 14 500 gal/min (3300 m3/hr) axial annular linear induction pump with center return (ALIP-CR) was designed to satisfy the requirements of Section III and Code Case 1592 of the ASME Boiler and Pressure Vessel Code.

TL;DR: In this paper, the authors performed heat transfer calibration tests on helium cooled bundles of 12 artificially roughened rods with the purpose of obtaining information for the thermo-hydraulic design of the 12-rod bundle fuel element to be irradiated in BR2.

TL;DR: In this paper, an axisymmetric shell with a torispherical head is considered and the criterion for optimization is to minimize the maximum shearing stress occurring in the structure.

TL;DR: In this paper, a representation of a sodium-heated steam generator was formulated to study density-wave oscillation of the flow, which facilitates prediction of flow instability by examining movements of unstable eigenvalues of the system matrix.

TL;DR: In this article, boundary-layer solutions for the velocity and temperature profiles for flow of an electrically conducting fluid over a semi-infinite flat plate in the presence of a transverse magnetic field and taking into account the heat due to viscous dissipation and stress-work were found.

TL;DR: The relation between deflection and load during the ring compression test used to study mechanical properties of a fuel cladding tube is examined by a computer program which deals with the elasto-plastic deformation by the two-dimensional finite element method.

TL;DR: In this paper, it was shown that the probability of core disruptive accidents caused by local failure propagation is very low in liquid metal fast breeder reactors (LMFBRs), and that there are three important inherent or engineered barriers to prevent this type of accident: early detection of local blockages, low probability of subassembly boiling and dryout, and the inherent ability to withstand the pressure pulses caused by molten fuel-sodium interactions.

TL;DR: In this article, the existing irradiation growth measurements for both annealed and cold-worked Zircaloy are critically reviewed with the aim of presenting the most reliable data for use in reactor design.

TL;DR: Most gas-cooled fast breeder Reactor (GCFR) programs in Europe and the US are now coordinated and focused on a 300 MW(e) GCFR demonstration plant program.

TL;DR: In this paper, an overview of the analysis of core-disruptive accidents is given, for the purpose of understanding and predicting fast reactor behavior in severe low probability accident conditions, to establish the consequences of such conditions and provide a basis for evaluating consequence limiting design features.

TL;DR: In this paper, a series of tests were performed to outline the behaviour of reinforced concrete slabs impinged by rigid missiles, and prediction of results was tried by means of finite element computation with elastic-plastic constitutive law for the concrete.