AREVA Fatigue Concept - A Three Stage Approach to the Fatigue Assessment of Power Plant Components

Rudolph, Jürgen; Bergholz, Steffen; Heinz, Benedikt; Jouan, Benoît

doi:10.5772/37029

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…This rule is widely used in the nuclear industry to design and evaluate the life of nuclear power plants [11][12][13][14]. According to this rule, damage can be calculated through using Equation (6), and the engineering structure fails when D equals 1.…”

Section: The Linear Damage Rulementioning

confidence: 99%

The Unified Creep-Fatigue Equation for Stainless Steel 316

Liú

Pons

Wong

2016

Metals

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Background-The creep-fatigue properties of stainless steel 316 are of interest because of the wide use of this material in demanding service environments, such as the nuclear industry. Need-A number of models exist to describe creep-fatigue behaviours, but they are limited by the need to obtain specialized coefficients from a large number of experiments, which are time-consuming and expensive. Also, they do not generalise to other situations of temperature and frequency. There is a need for improved formulations for creep-fatigue, with coefficients that determinable directly from the existing and simple creep-fatigue tests and creep rupture tests. Outcomes-A unified creep-fatigue equation is proposed, based on an extension of the Coffin-Manson equation, to introduce dependencies on temperature and frequency. The equation may be formulated for strain as ε p = C 0 c T, t, ε p N −β 0 , or as a power-law ε p = C 0 c (T, t) N −β 0 b(T,t) . These were then validated against existing experimental data. The equations provide an excellent fit to data (r 2 = 0.97 or better). Originality-This work develops a novel formulation for creep-fatigue that accommodates temperature and frequency. The coefficients can be obtained with minimum experimental effort, being based on standard rather than specialized tests.

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Section: The Linear Damage Rulementioning

confidence: 99%

The Unified Creep-Fatigue Equation for Stainless Steel 316

Liú

Pons

Wong

2016

Metals

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“…A more detailed discretization of the transients (right column) results in decreasing CUF's around 0.003. The difference between peak-valley and rain flow is not detectable but can be more significant for long loadtime histories (see [1]). Note that CUF's are calculated for the transition region (position C) in case of the analytical approach of 2a) while the thick walled section (position A) is the reference for the finite element calculations.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…As regards fatigue monitoring, generally two possible basic approaches are practiced: global and local concepts. The first mentioned relies on signals from the standard plant instrumentation (in connection with transfer functions for the consideration of remote locations) whereas the second one requires additional measurement sections at fatigue relevant locations (see reference [1] for a more detailed discussion of the local concept). In the absence of additional measurement sections fatigue monitoring is principally based on fluid temperature and pressure, determined using information from the plant instrumentation such as thermocouples, pressure transducers, and flow meters.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Assessment of NPP Piping and Components Using Realistic Thermal-Mechanical Load Histories

Rudolph¹,

Maneschy

Cisternas

et al. 2014

Volume 1: Codes and Standards

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Modern state-of-the-art fatigue monitoring approaches gain in importance as part of the ageing management of conventional and nuclear power plant components (NPP) and particularly in the context of lifetime extension projects and new plants. A key feature of qualified fatigue monitoring is the measurement of realistic loads based on plant instrumentation and/or local temperature measurement. The major prerequisites for any subsequent fatigue assessment are the accurate component stress analysis and the identification of relevant cycles, using highly qualified and efficient cycle counting methods. component). Conventional and more advanced methodologies are subsequently applied for comparison purpose. The influence of the cycle counting method applied on the resulting partial fatigue usage factors are elaborated based on the given realistic plant data.

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“…For a more detailed discussion reference [1] is recommended to the interested reader. The concept provides for a multiple step and multidisciplinary process (process engineering, fatigue monitoring, fatigue analyses etc.)…”

Section: Overview Of the Areva Fatigue Concept (Afc)mentioning

confidence: 99%

Fatigue Monitoring Approaches for Power Plants

Jouan¹,

Bergholz²,

Rudolph³

2014

Volume 1: Codes and Standards

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Modern state-of-the-art fatigue monitoring approaches gain in importance not only as part of the ageing management of nuclear power plant components but also in the context of conventional power plants and renewables such as wind power plants. Consequently, lots of operators have to deal with demanding security requirements to ensure the safe operation of power plants and to cope with plant lifetime extension (PLEX) related issues.AREVA disposes of a long tradition in the development of fatigue and structural health monitoring solutions. Nuclear and conventional power plant applications require the qualified assessment of measured thermo-mechanical loads. The methodology is transferable to mechanical loading conditions such as those of wind energy plants. The core challenge is the identification and qualified processing of realistic load-time histories. The related methodological requirements will be explained in detail. This paper mainly describes the fatigue and structural health methodologies developed within the AREVA Fatigue Concept (AFC).

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AREVA Fatigue Concept - A Three Stage Approach to the Fatigue Assessment of Power Plant Components

Cited by 5 publications

References 4 publications

The Unified Creep-Fatigue Equation for Stainless Steel 316

The Unified Creep-Fatigue Equation for Stainless Steel 316

Fatigue Assessment of NPP Piping and Components Using Realistic Thermal-Mechanical Load Histories

Fatigue Monitoring Approaches for Power Plants

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