Estimation of master curve based RTto reference temperature from CVN data

Kim Wallin, G. Nagel, E. Keim, D. Siegele

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The ASME code cases N-629 and N-631 permit the use of a master curve-based index temperature (RTTo≡T0+19.4°C) as an alternative to traditional RTNDT-based methods of positioning the ASME KIC and KIR curves.
This approach was adopted to enable the use of master curve technology without requiring the wholesale changes to the structure of the ASME code that would be needed to use all aspects of master curve technology. For the brittle failure analysis considering irradiation embrittlement an additional procedure to predict the adjustment of fracture toughness for end of life (EOL) from irradiation surveillance results must be available as by NRC R.G. 1.99 Rev. 2, e.g., the adjusted reference temperature is defined as ART=initialRTNDT+ΔRTNDT+margin.
The conservatism of this procedure when RTNDT is replaced by RTTo is investigated for western nuclear grade pressure vessel steels and their welds. Based on a systematic evaluation of nearly 100 different irradiated material data sets, a simple relation between RTToirr, RTToref, and ΔT41JRG is proposed.
The relation makes use of the R.G. 1.99 Rev. 2 and enables the minimizing of margins, necessary for conventional correlations based on temperature shifts.
As an example, the method is used to assess the RTTo as a function of fluence for several German pressure vessel steels and corresponding welds. It is shown that the method is robust and well suited for codification.
Original languageEnglish
Pages (from-to)420-425
JournalJournal of Pressure Vessel Technology
Volume129
Issue number3
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

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Steel structures
Welds
Irradiation
Embrittlement
Temperature
Failure analysis
Fracture toughness

Keywords

  • Charpy-V shift
  • Code cases N-629 and N-631
  • KIC
  • Master curve

Cite this

Wallin, Kim ; Nagel, G. ; Keim, E. ; Siegele, D. / Estimation of master curve based RTto reference temperature from CVN data. In: Journal of Pressure Vessel Technology. 2007 ; Vol. 129, No. 3. pp. 420-425.
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abstract = "The ASME code cases N-629 and N-631 permit the use of a master curve-based index temperature (RTTo≡T0+19.4°C) as an alternative to traditional RTNDT-based methods of positioning the ASME KIC and KIR curves. This approach was adopted to enable the use of master curve technology without requiring the wholesale changes to the structure of the ASME code that would be needed to use all aspects of master curve technology. For the brittle failure analysis considering irradiation embrittlement an additional procedure to predict the adjustment of fracture toughness for end of life (EOL) from irradiation surveillance results must be available as by NRC R.G. 1.99 Rev. 2, e.g., the adjusted reference temperature is defined as ART=initialRTNDT+ΔRTNDT+margin. The conservatism of this procedure when RTNDT is replaced by RTTo is investigated for western nuclear grade pressure vessel steels and their welds. Based on a systematic evaluation of nearly 100 different irradiated material data sets, a simple relation between RTToirr, RTToref, and ΔT41JRG is proposed. The relation makes use of the R.G. 1.99 Rev. 2 and enables the minimizing of margins, necessary for conventional correlations based on temperature shifts. As an example, the method is used to assess the RTTo as a function of fluence for several German pressure vessel steels and corresponding welds. It is shown that the method is robust and well suited for codification.",
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Estimation of master curve based RTto reference temperature from CVN data. / Wallin, Kim; Nagel, G.; Keim, E.; Siegele, D.

In: Journal of Pressure Vessel Technology, Vol. 129, No. 3, 2007, p. 420-425.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Siegele, D.

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