Statistical Analyses of High Cycle Fatigue French Data for Austenitic SS

Blatman, Géraud; Métais, Thomas; Roux, Jean‐Christophe Le; Cambier, S.

doi:10.1115/pvp2014-28409

Cited by 2 publications

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“…Concerning the factor on strain amplitude, as in NUREG/CR -6909, it is recognised that the combination of the aggravating effect is not applicable and that the greatest aggravating effect is applicable. In this case, the largest value is the one associated with data scatter and calculated through the application of four statistical evaluations [25]. It is finally fixed as 1.4.…”

Section: Rcc-m Approachmentioning

confidence: 99%

Environmental Fatigue Analysis of Nuclear Structural Components: Assessment Procedures, Loads, and a Case Study

Cicero

Métais

Voloshyna³

et al. 2020

Metals

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Nowadays, environmental fatigue assessment is mandatory in many countries, in the design and operational stages of nuclear structural components. The analysis of environmental fatigue can be a complex engineering process that is generally performed following national or international procedures. Such procedures are not always based on the same assumptions, and novel analysts may find a confusing variety of documents. Moreover, once a specific procedure has been chosen for the analysis, it is possible to complete the fatigue assessment by using design transients (and loads) or, alternatively, real loads provided by monitoring systems. In this context, this paper provides a comprehensive review of the different environmental fatigue assessment procedures and a brief description of the different types of load inputs (design vs. real data). The work is completed with a case study, in which the (fatigue) cumulative usage factor is estimated in a particular nuclear component by using one of the abovementioned assessment procedures (NUREG/CR-6909) and two options for the load inputs.

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Section: Rcc-m Approachmentioning

confidence: 99%

Environmental Fatigue Analysis of Nuclear Structural Components: Assessment Procedures, Loads, and a Case Study

Cicero

Métais

Voloshyna³

et al. 2020

Metals

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“…These four methods are: the prediction intervals [26] the Wilks percentiles or order statistics, the maximum likelihood [27] and the quantile regression [28]. This work is summarized in the Reference [25] and will not be detailed here. The Table 2 summarizes the coefficients obtained through the application of these four methods.…”

Section: ) Coefficient On the Number Of Cyclesmentioning

confidence: 99%

Overview of French Proposal of Updated Austenitic SS Fatigue Curves and of a Methodology to Account for EAF

Métais

Courtin

Genette

et al. 2015

Volume 1A: Codes and Standards

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Environmentally Assisted Fatigue is receiving nowadays an increased level of attention not only for new builds but also for the installed bases which are currently having their lives extended to 60 years in various countries. To formally integrate these effects, some international codes have already proposed code cases. More specifically, the ASME code has used the NUREG/CR-6909 [1] as the basis for Code Case N-792 [2] and suggests a modification of the austenitic stainless steels fatigue curve combined with a calculation of an environmental penalty factor, namely Fen, which is to be multiplied by the usual fatigue usage factor. The various methodologies proposed are not finalized and there is still a significant level of discussion as can be illustrated by the recent update of NUREG/CR-6909 [3]. In this context, EDF, AREVA and the CEA have also submitted two RCC-M Rules in Probatory Phase (RPP) (equivalent to ASME code-cases) to AFCEN to propose respectively an update of the fatigue curve for austenitic stainless steels and a methodology to incorporate EAF in fatigue evaluations. The approach is globally similar to the one in the ASME code: it consists in an update of the mean air and design fatigue curves as well as the calculation of an environmental penalty factor. Nevertheless, the methodologies differ in their detailed implementation by especially introducing the Fen-integrated which accounts for the environmental effects already covered by the fatigue curves. This paper is the sequel to the proposal already described in [4] [6].

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Statistical Analyses of High Cycle Fatigue French Data for Austenitic SS

Cited by 2 publications

References 0 publications

Environmental Fatigue Analysis of Nuclear Structural Components: Assessment Procedures, Loads, and a Case Study

Environmental Fatigue Analysis of Nuclear Structural Components: Assessment Procedures, Loads, and a Case Study

Overview of French Proposal of Updated Austenitic SS Fatigue Curves and of a Methodology to Account for EAF

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