Showing papers in "Nuclear Engineering and Design in 1989"

TL;DR: In this article, a method of generating multiple support inputs for any given set of n surface locations having space coordinates xi and yi which are compatible with the main wave propagation properties observed in the Strong Motion Array Taiwan (SMART-1).

TL;DR: One theoretical and experimental method is depicted to take into account the energy phenomena, associated with the elasto—plastic deformation process, during the elaboration of behaviour laws, in the case of isotropic or kinematical hardening.

TL;DR: In this paper, the experimental behavior of a 316 stainless steel and a 2024 aluminium alloy at room temperature and under complex nonproportional strainings in tension-torsion was investigated.

TL;DR: In this article, a physically-based theory of damage for ductile metals is outlined, which rests upon a direct extension of the authors recently proposed viscoplastic model for finite deformations to include the effects of dislocation, void interactions as they manifest themselves in void nucleation, growth and coalescence.

TL;DR: In this paper, a large amount of rod bundle data was obtained and it was found from the results that the cross-sectional averaged void fraction data for a rod bundle can be correlated by the Drift-Flux model and that the Zuber-Findlay correlation underestimates the data in a void fraction area of 80% or more.

TL;DR: In this article, the authors present constitutive equations able to account for time independent plasticity together with creep and creep-plasticity interaction, and the practical applicability of the model is tested, mainly using test results from the literature, but also specific data including creep, relaxation and tensile tests with various loading rates.

TL;DR: In this paper, a fundamental inequality which generalizes Hill's maximal work principle on the general class of mechanical systems with an elastic range which contains plastic, damaged and cracked media was obtained.

TL;DR: In this article, the penetration, scabbing and perforation processes in concrete structures hit by solid missiles are discussed and the influence of the missile slenderness and crushing strength is evaluated.

TL;DR: This paper reviewed the probabilistic modeling of fatigue crack growth from 1980 to the present, focusing on evolutionary models that start with the randomization of a deterministic differential equation by the introduction of random variables or random functions, and directly generate the evolution of distributions.

TL;DR: In this paper, ten types of constitutive models were utilized to compare analytical predictions to sixteen benchmark experiments which are grouped into four categories: tensile and creep tests under monotonic loading, mixed mode tests under plastic and creep loading, ratcheting deformation tests under program loads, and cyclic deformation under the combination of different strain rates.

TL;DR: In this article, the authors present a range of non-linear analytic functions to generate light water thermodynamic properties, from 0.085 MPa to 21.3 MPa, and from 90°C to 450°C.

TL;DR: In this paper, the basic philosophical framework for the analysis and presentation of uncertainties in probabilistic safety assessments is presented, and state-of-knowledge and stochastic uncertainties are discussed, as well as the analysis of new evidence.

TL;DR: In this article, a model was developed to predict the droplet size distribution of a two-phase jet with high-enthalpy coolant discharging into the containment building as a two phase jet.

TL;DR: In this article, wear and hairline cracking have been observed in the cladding of rod cluster control assemblies (RCCAs) in several pressurized water reactors (PWRs) and the cracks are typically about 10 cm long, oriented longitudinally, and located in the high-fluence region of the rods.

TL;DR: In this paper, a simple linear relationship between average h and the slope of the resistance curve was proposed for the case of a part-through crack in a plate under tension, which yielded improved prediction of the crack front development due to stable crack extension.

TL;DR: In this paper, a non-linear digital predictor is used to estimate shrink and swell effects in the level measurement for thermal shrink and swells effects, which causes complications in level control during low power operation.

TL;DR: In this paper, a cylindrical shell with a semi-elliptical inner surface crack is considered and the authors discuss the reasons for different crack resistance behavior in dependence on specimen size and geometry as well as conditions for the transferability of test results from specimens to structures.

TL;DR: In this article, a statistical characterization of the fracture toughness data has been carried out using the computer data bank and an approach using the tanh function to model the transition behaviors of the toughness of each has been applied.

TL;DR: In this article, the CAI system was used for the evaluation of the dynamic elastic-fracture toughness parameters, i.e., the dynamic crack initiation toughness (K Id, J Id ) and growth toughness (J R curve, tearing modulus: T mat ) in various materials such as steel, aluminum alloy, titanium alloy, cast iron and so on.

TL;DR: In this paper, the leakage-before-break (LBB) behavior prediction based on analyses could be further developed and substantiated on the basis of numerous tests which were performed to demonstrate the "Leak-Before-Break" behaviour predictions.

TL;DR: In this article, the second part of the Benchmark Project by the Subcommittee on the Inelastic Analysis and Life Prediction of High Temperature Materials, JSMS, concerning the life prediction methods under fatigue and creep interaction by taking into account the plasticity-creep interaction described by the constitutive models treated in the first part.

TL;DR: In this article, a model including an R- ratio factor is fitted to the data, and the quality of the fit is verified by several sets of data that were not used for fitting.

TL;DR: In this article, a new transformed parameter Y linked to both the local material behaviour and structural coupling is introduced to find limit loads or stabilized cyclic response to cyclic loads, which leads to an easy solution.

TL;DR: In this paper, a mechanistic model of critical heat flux (CHF) in upflow boiling at low qualities is performed based on a physical criterion of CHF occurrence and a mechanism limiting the thermal transport between a stagnant bubbly layer and bulk stream.

TL;DR: In this paper, a series of tests has been conducted followed by numerical analysis to find the best models for the observed behaviour, which can be assumed that such accidents will involve the fall of a body which may possibly be extremely massive, on the reactor structures.

TL;DR: In this article, a human-factors analysis is performed on generic emergency operating procedures for three strategies of control; manual, semi-automatic and automatic, using standard operating procedures.

TL;DR: In this article, the results of the research done at the Institute for Concrete Structures in Karlsruhe are presented in order to furnish new ideas for the material research due to dynamic loading.

TL;DR: In this article, a method of classifying the transient critical heat flux (CHF) mechanisms has been proposed based on a novel transient CHF map which considers upstream and local effects.

TL;DR: In this paper, a leak-before-breach (LBB) approach for large diameter heat transport piping for Darlington NGS A as an alternative to the provision of pipewhip restraints is presented.