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Showing papers in "Nuclear Engineering and Design in 1980"


Journal ArticleDOI
TL;DR: In this article, the authors present a methodology for estimating the ground motion capacity of a structure, component, etc., given by A = A ϵ R ϵ U, where A is the best estimate of the median ground acceleration capacity, ϵR and ϵU are lognormal random variables with unit median and logarithmic standard deviation βR and βU, respectively.

312 citations


Journal ArticleDOI
TL;DR: A simplified algorithm for the calculation of the base of a coherent function is described, which can be used to reduce the size of the normal disjunctive form of the function in the case that the function is not coherent, and eases the application of the Nelson algorithm.

118 citations


Journal ArticleDOI
TL;DR: In this paper, the overall problem of nuclear power plant safety against an accidental aircraft impact is discussed in relation with its structural analysis and design, and the feasibility of resorting to a static analysis is also discussed.

90 citations


Journal ArticleDOI
TL;DR: In this paper, the seismic response of a structure which, in addition to earthquake loading, is subjected to the impact force resulting from pounding by an adjacent building, is determined, and different types of running devices which reduce the response of pounding are examined.

66 citations


Journal ArticleDOI
TL;DR: In this paper, the authors used Bayes' theorem to derive plant specific distributions for the failure rates of components and used these distributions as prior distributions in BOW and modified them using plant specific data.

62 citations


Journal ArticleDOI
TL;DR: In this article, the damping data available in the open literature applicable to nuclear power plant structures and equipment is summarized and statistically analyzed, and the results of this analysis are used to develop damping trend curves which predict applicable damping values to be used in design at various levels of stress or deformation.

56 citations


Journal ArticleDOI
TL;DR: In this article, experimental data and analysis of the pressure drop of turbulent flow through rod bundles is presented. But the authors focus on laminar flow and do not consider the effect of spacer grids on the velocity distribution.

54 citations


Journal ArticleDOI
TL;DR: In this article, an experimental study of developed single phase turbulent flow through a square pitched array of rod bundles is described, where measurements were made at two spacings (p d = 1.194, 1.107 ) of the mean velocity distribution and wall shear stress variation, together with the six terms of the symmetrical Reynolds tensor.

46 citations


Journal ArticleDOI
TL;DR: In this article, the authors used a probabilistic model to generate the power spectral density of an equivalent stationary Gaussian process having the design spectrum as expected maximum response, and a subsequent iterative process refines the solution to match the target spectrum.

43 citations


Journal ArticleDOI
TL;DR: In this paper, a method for calculating the thermal stresses in a finite rectangular plate with a Griffith crack under a steady state temperature field is presented, based on the complex variable method for determining the stationary two-dimensional thermal stresses, the analytic continuation and the modified mapping-collocation methods are effectively employed.

43 citations


Journal ArticleDOI
TL;DR: In this paper, the effect of the strain rate (from 10 −2 to 10 3 s −1 ) on the uniaxial flow curves of the steels AISI 304L, A ISI 316L, and AisI 321, virgin, welded and irradiated up to 2.2 dpa, at temperatures up to 950°C, is discussed.

Journal ArticleDOI
TL;DR: In this paper, three methods used in rod-bundle thermal-hydraulic analysis are summarized: subchannel analysis, porous medium formulation with volume porosity, surface permeability, distributed resistance and distributed heat source (sink).

Journal ArticleDOI
TL;DR: In this paper, a comprehensive test program was carried out to investigate the dependence of longitudinal and transversal crack sizes upon load (bending and internal pressure), pressure medium and temperature.

Journal ArticleDOI
TL;DR: An attempt is made to classify material data and models, and the state of the art of accident analysis by means of fuel element codes is outlined, a completion of code ranking already carried out in the past.

Journal ArticleDOI
TL;DR: In this paper, a model for the release of fission gas from irradiated UO 2 fuel is presented, which incorporates the relevant physical processes, such as gas diffusion, bubble and grain boundary movement, intergranular bubble formation and interlinkage.

Journal ArticleDOI
TL;DR: Better accuracy and faster running times are obtained than using the finite-difference method and the difficulties associated with using the Booth approximation when irradiation conditions change are overcome.

Journal ArticleDOI
TL;DR: In this article, the drift-flux parameters (C0 and Vgj) were used to automatically predict CCFL conditions in the special case of simulated inlet flow blockage.

Journal ArticleDOI
TL;DR: In this article, the unavailability model for individual components includes separate downtime contributions due to testing, repair, hardware failures, human testing and repair errors as well as failures caused by true demands.

Journal ArticleDOI
TL;DR: In this article, the derivation of cyclic constitutive relations during inelastic regime where hardening, softening and creep can occur, and the development of the eventual periodical state in the structure during cyclic thermodynamical loadings are considered.

Journal ArticleDOI
TL;DR: The steady-state and transient gas release and swelling subroutine (GRASS-SST) as discussed by the authors is a mechanistic code for the prediction of fission gas behavior in UO 2 -base fuels.

Journal ArticleDOI
TL;DR: In this paper, an analytical method is developed whereby a simple estimate can be obtained of the maximum dynamic response of light equipment attached to a structure subjected to ground motion, based on the transient analysis of lightly damped tuned or slightly nontuned equipment-structure systems in which the mass of the equipment is much smaller than that of the structure.

Journal ArticleDOI
TL;DR: In this article, the dynamic pressure in the downcomer of a PWR was measured in a dynamic scale flow model and also in a commercial plant during pre-operational tests, where pressure transducers were installed in closely spaced groups of 3 to 7 in order to measure both the amplitude as a function of position and the coherence of the forcing function between two spatial points.

Journal ArticleDOI
TL;DR: A survey of recent progress in computerized structural analysis can be found in this article, where the focus is on new transient algorithms, fluid-structure interaction, finite elements for nearly-incompressible solids, and beam, plate and shell structures based upon theories which include transverse shear deformations.

Journal ArticleDOI
TL;DR: This article reviews the CM/CC failure phenomenon and the defenses against such failures and their weaknesses are surveyed, and some regulatory considerations, operating experiences, and reliability analysis methodology are touched upon.

Journal ArticleDOI
TL;DR: In this article, the authors describe results of an experimental program to reduce uncertainties associated with the thermal-hydraulic design and analysis of LMFBR blanket assemblies, which can vary from 20 kW to ∼ 2 MW.

Journal ArticleDOI
TL;DR: The first International Seminar on Fluid-Structure Interaction in Light Water Reactors as discussed by the authors was held in Berlin, August 20-21, 1979 in conjunction with the 5th International Conference on Structural Mechanics in Reactor Technology (SmiRT).

Journal ArticleDOI
TL;DR: In this article, an investigation of the hydraulic behavior of wire-wrapped fuel and blanket assemblies was conducted in an air flow test facility and the role of these tests on the core thermal-hydraulic design through calibration and verification of the analytical codes employed in the design.

Journal ArticleDOI
TL;DR: In this article, an analysis on the relevance of fuzzy sets and systems theory to the reactor plant failure analysis and diagnosis is presented, and two inequalities for estimating the bounds on the components of the failure vector are then combined to obtain a single inequality for failure diagnosis.

Journal ArticleDOI
TL;DR: In this paper, a considerable number of analytical and numerical models have been developed in order to solve the heat condition problem in the fuel pin and predict the rewetting velocity, and a comparison among the existing models has been performed.

Journal ArticleDOI
TL;DR: In this article, the responses of a massless basemat, a mass-spring system connected to a basemata with mass, and a mass spring system connected with a base with mass are parametrically analyzed for harmonic and transient excitations for all wave forms (SH-, P-, SV- and Rayleigh waves) compared with the same structures, calculated for the standard vertically incident body waves of the same amplitudes.