Elastic anisotropy of zirconium alloy fuel cladding

Nakatsuka, Masafurni

doi:10.1016/0029-5493(81)90124-2

Cited by 8 publications

(2 citation statements)

References 9 publications

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“…The increase of Á f with increased hydrogen concentration implies that two stiffness constants, which are related to the two shear components 7) to the thickness direction on the specimen cross sections, out of nine constants in the specimens with anisotropic elasticity 7) have different sensitivity to the increased hydrogen concentration. Details of the mechanism for the change in Á f with increased hydrogen are being investigated and are to be reported in the separate paper.…”

Section: Acoustic Properties Obtained By Emar Methodsmentioning

confidence: 99%

A New Non-destructive Technique for Hydrogen Level Assessment in Zirconium Alloys using EMAR Method

Nakatsuka¹,

Ishimoto²,

Ishii

et al. 2006

Journal of Nuclear Science and Technology

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In order to study the applicability of EMAR (electromagnetic acoustic resonance) method to non-destructive hydrogen level assessment in fuel spacer bands at pool side, an ultrasonic transmitter and receiver together with an EMAT (electromagnetic transducer) were used. Unirradiated Zircaloy-2 thin plates were hydrogen charged for the measurements. An irradiated fuel cladding tube was also used to examine the detection sensitivity of the resonance spectrum of the irradiated material. The following results were obtained. Acoustic anisotropy Á f , defined by using two resonance frequencies for shear waves with different polarization, was adopted as a parameter to express the ultrasonic resonance property. A hydrogen concentration dependence of Á f was observed in the range up to 1,200 ppm. Specimen thickness and oxide thickness were found to have negligible effect, on Á f , and liftoff of the sensor up to 1 mm did not affect the Á f value. The acoustic anisotropy proposed in this paper was not sensitive to any of specimen dimension, surface condition, or sensor liftoff.

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Section: Acoustic Properties Obtained By Emar Methodsmentioning

confidence: 99%

A New Non-destructive Technique for Hydrogen Level Assessment in Zirconium Alloys using EMAR Method

Nakatsuka¹,

Ishimoto²,

Ishii

et al. 2006

Journal of Nuclear Science and Technology

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“…They were calculated according to the properties measured in the crystallographic orientations of the ! -Zr monocrystal [7] and related to the global system using the Kearns parameters [8], which enable to take into account the anisotropic properties and the texture of the metal. These Kearns parameters are given in normal, tangential and longitudinal directions: f n = 0.613 , f t = 0.328 and f l = 0.074 .…”

Section: Physical Datamentioning

confidence: 99%

Coupled Modelling of ZrO2/α-Zr(O) Layers Growth under Thermal and Mechanical Gradients

Minne

Optasanu

Montésin

2019

J. Mater. Sci. Technol. Res.

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The oxidation process of a nuclear reactor fuel rod clad made of zirconium is simulated. It is assumed that the oxygen is transported by anionic diffusion in the zirconia layer (ZrO2). Part of this oxygen reacts at the interface between the zirconia layer and the metal, while the rest diffuses in the oxygen-enriched metal volume (a-Zr(O)) to the core of the metal by an interstitial mechanism. The model is based on the thermodynamics of irreversible processes and takes into account the influence of driving forces on the oxygen migration in the metal such as the oxygen concentration gradient, the temperature gradient [1] and the mechanical stress gradient [2]. The growth of both ZrO2 and a-Zr(O) layers are simulated using the finite element software CAST3M. This model has been applied on an axisymmetric geometry by imposing a heat flow on the fuel side and a constant temperature on the waterside of the clad. The differences obtained in the inner and outer sides of the nuclear clad concerning the oxidation kinetics and oxygen distribution are related to some coupling parameters. Several values of those parameters are used in the simulations to highlight their influence on the oxidation behavior. Thus, we show that negative values for the heat of transport, which relates the gradient of ocncentration and the gradient of temperature, give coherent results with experimental observations on oxidation kinetics for both sides of the clad.

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A fractographic study of iodine-induced stress corrosion cracking in irradiated Zircaloy-2 cladding

Shimada¹,

Nagai²

1983

Journal of Nuclear Materials

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Elastic anisotropy of zirconium alloy fuel cladding

Cited by 8 publications

References 9 publications

A New Non-destructive Technique for Hydrogen Level Assessment in Zirconium Alloys using EMAR Method

A New Non-destructive Technique for Hydrogen Level Assessment in Zirconium Alloys using EMAR Method

Coupled Modelling of ZrO2/α-Zr(O) Layers Growth under Thermal and Mechanical Gradients

A fractographic study of iodine-induced stress corrosion cracking in irradiated Zircaloy-2 cladding

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