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Showing papers in "Nuclear Engineering and Design in 1999"


Journal ArticleDOI
TL;DR: In this article, it was shown that the water depletion in the mixing zone suppresses steam explosions with corium melts at ambient pressure and in the present pour geometry, however, propagating low energy (about twice the energy of the trigger pulse) events were observed.

132 citations


Journal ArticleDOI
TL;DR: In this article, a moving particle semi-implicit (MPS) method based on moving particles and their interactions has been developed for numerical simulation of the fragmentation process in vapor explosions, and a numerical model to calculate boiling from water to steam is developed.

116 citations


Journal ArticleDOI
TL;DR: The PHEBUS FP program as discussed by the authors is the centrepiece of an international co-operation investigating, through a series of integral in-pile experiments, keyphenomena involved in the progression of a postulated severe accident in a light water reactor (LWR).

107 citations


Journal ArticleDOI
TL;DR: In this article, the degradation of steam generator tubes in pressurized water nuclear reactors, and, in particular, the stress corrosion cracking (SCC) of Alloy 600 tubes, continues to be a serious problem.

101 citations


Journal ArticleDOI
S Gondrom1, J. Zhou1, M. Maisl1, H. Reiter1, Michael Kröning1, Walter Arnold1 
TL;DR: Computed laminography (CL) as mentioned in this paper is an image forming method of X-ray testing that yields images of object slices by a simple linear translation of the object relative to the tube-detector system.

92 citations


Journal ArticleDOI
TL;DR: In this paper, the influence of melt quantity and composition, water depth and initial pressure on quenching was assessed on the basis of seven tests performed under various conditions in the TERMOS vessel of the FARO facility at JRC-Ispra.

91 citations


Journal ArticleDOI
TL;DR: In this paper, a review of the seismic response of buried pipelines is presented, which includes modeling of soil-pipe system and seismic excitation, methods of response analysis of buried pipeline, seismic behavior of underground pipelines under different parametric variations, seismic stresses at the bends and intersections of network of pipelines.

90 citations


Journal ArticleDOI
TL;DR: In this paper, the structural integrity of power plant piping was evaluated using monotonic bending tests on 4 and 3.5-in. diameter full-scale carbon steel pipe specimens with local wall thinning.

89 citations


Journal ArticleDOI
TL;DR: In this paper, a three-dimensional finite element analysis of bolted joints with finite sliding deformable contact has been studied, and the helical and friction effect on the load distribution of each thread is analyzed.

83 citations


Journal ArticleDOI
TL;DR: In this article, the effects of melt physical properties, and the thermal hydraulics of the mixing zone, on jet fragmentation were investigated, and two innovative approaches to computational fluid dynamics (CFD) modeling of jet fragmentation are developed and employed for analysis.

81 citations


Journal ArticleDOI
TL;DR: In this article, the authors investigated the nonlinear dynamics of multiple parallel boiling channels with forced flows by using the Galerkin nodal approximation method and constructed stability maps for multiple-channel systems subject to a constant total mass flow rate on the parameter plane of the subcooling and phase change numbers.

Journal ArticleDOI
TL;DR: In this article, a comparison of some void fraction relationships for co-current gas-liquid flow is presented, and the measured average void fractions for the two test sections were compared with predictions of several empirical correlations.

Journal ArticleDOI
TL;DR: In this article, the authors investigated the dynamic interaction between buildings during an earthquake through the soil, termed as dynamic cross interaction (DCI) in nuclear power plants, where adjacent buildings are considered to influence each other through soil during earthquakes and to exhibit dynamic behaviour different from that of separate buildings.

Journal ArticleDOI
TL;DR: In this article, an experimental investigation on the thermal mixing phenomena of three quasi-planar vertical jets, with the central jet at a lower relative temperature than the two adjacent jets, was conducted.

Journal ArticleDOI
TL;DR: In this paper, a life assessment technique for aged components made of modified 9Cr-1Mo steel was developed to evaluate the effect of aging on the microstructure and mechanical properties of the components.

Journal ArticleDOI
TL;DR: In this article, the intercritical heat treatment (IHT) was applied to SA508 Cl.3 steels to produce a composite structure of hard tempered martensite and soft double-tempered bainite.

Journal ArticleDOI
TL;DR: In this article, the authors compared the results of the conventional creep tests with those of small punch creep tests, i.e. miniaturized disc bending tests performed on 14 MoV 6 3 and X20 CrMoV 12 1 steels, in different laboratories.

Journal ArticleDOI
A. Rossoll1, Clotilde Berdin1, P. Forget, C. Prioul1, B. Marini 
TL;DR: In this article, a comparative experimental and FEM study has been carried out, in order to investigate dynamic and constraint aspects of the Charpy test, in which standard V-notch Charpy specimens were tested under dynamic and static loading conditions.

Journal ArticleDOI
TL;DR: In this article, a technology to determine shallow-flaw fracture toughness of reactor pressure vessel (RPV) steels is developed for application to the safety assessment of RPVs containing postulated shallow surface flaws.

Journal ArticleDOI
TL;DR: In this paper, a creep rupture model for predicting failure was developed and validated by tests on unflawed and flawed specimens containing axial and circumferential flaws and loaded by constant as well as ramped temperature and pressure loadings.

Journal ArticleDOI
TL;DR: In this article, a new method is proposed for evaluating accurate incabinet response spectra for seismic qualification of electrical instruments, where only few (often one) modes contribute significantly to the spectral accelerations at critical instrument locations inside the cabinet.

Journal ArticleDOI
G. Sengler, F. Forêt1, G. Schlosser2, R. Lisdat, S. Stelletta 
TL;DR: In this article, the potentials of the EPR under the boundary conditions prevailing at the end of the Basic Design Phase are illustrated for illustrating the potential of the EEPR under different power level boundary conditions, and some representative results of basic design neutronic and thermal hydraulic studies are described.

Journal ArticleDOI
TL;DR: In this article, the authors analyzed the counter-current flow limit (CCFL) in the surge line and found that the vertical section of surge line is the most limiting section.

Journal ArticleDOI
TL;DR: It is shown that SIMMER-III can reproduce the premixing phase both in water and sodium systems as well as the propagation of steam explosion and is basically capable of simulating integral multiphase thermal-hydraulic problems included in FCI experiments.

Journal ArticleDOI
TL;DR: In this article, the authors implemented measurements of the wall thinning of the carbon steel piping under the request of regulation authority to prevent the events due to erosion/corrosion since 1989.

Journal ArticleDOI
TL;DR: In this paper, a thermal hydraulics computer code was developed to simulate the geysering instability in a natural circulation system starting from subcooled conditions and to assess the impact of the system pressure and channel inlet subcooling on the inception of instability.

Journal ArticleDOI
TL;DR: In this paper, some of the available leak rate evaluation formulae are reviewed, and an application to the prediction of the leak rate of either dry air or air+steam mixture through a cracked concrete panel is presented.

Journal ArticleDOI
TL;DR: In this article, the Oak Ridge National Laboratory developed a Structural Materials Information Center that contains data and information on the time variation of material properties under the influence of pertinent environmental stressors and aging factors for 144 materials.

Journal ArticleDOI
TL;DR: In this article, the fluid structure interaction (FSI) has been used to calculate the effective structural damping in a pipe system with pump shutdown and valve closing in the nuclear power plant KRB II.

Journal ArticleDOI
TL;DR: In this article, the effect of water subcooling, high-temperature steam properties, the radiation heat transfer and mixing zone boiling dynamics on the vapor film characteristics was investigated using a novel CFD modelling concept named as the local homogeneous slip model (LHSM).