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RESEARCH PAPERS

Estimation of Master Curve Based RTTO Reference Temperature From CVN Data

[+] Author and Article Information
Kim R. Wallin

 VTT Industrial Systems, P.O. Box 1704, FIN-02044 VTT, Finlandkim.wallin@vtt.fi

Gerhard Nagel

 E.ON Kernkraft GmbH, Tresckowstrasse 5, 30457 Hannover, Germanygerhard.nagel@eon-energie.com

Elisabeth Keim

 AREVA NP GmbH, Freyeslebonstrasse 1, 91058 Erlangen, Germanyelisabeth.keim@areva.com

Dieter Siegele

 Fraunhofer IWM, Woehlerstrasse 11, 79108 Freiburg, Germanysi@iwm.fhg.de

J. Pressure Vessel Technol 129(3), 420-425 (Jun 08, 2006) (6 pages) doi:10.1115/1.2748823 History: Received September 12, 2005; Revised June 08, 2006

The ASME code cases N-629 and N-631 permit the use of a master curve-based index temperature (RTToT0+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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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Original uncorrected data used to establish ASME KIC reference curve (1)

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Figure 2

Justification for ASME code cases N-629 and N-631

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Figure 3

Irradiated size corrected fracture toughness data for A302 type plates, compared to code cases N‐629∕631 prediction

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Figure 4

Irradiated size corrected fracture toughness data for A508 type forgings, compared to code cases N‐629∕631 prediction

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Figure 5

Irradiated size corrected fracture toughness data for A533B type plates, compared to code cases N‐629∕631 prediction

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Figure 6

Irradiated size corrected fracture toughness data for welds, compared to code cases N‐629∕631 prediction

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Figure 7

Irradiated size corrected fracture toughness data from German database (5), compared to code cases N‐629∕631 prediction

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Figure 8

Comparison of R.G. 1.99 fluence function with data from German database (5)

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Figure 9

Irradiated size corrected fracture toughness data, for welds and base materials, from German database (5), with valid T0ref values and ΔT41JRG determined according to R. G. 1.99, compared to code cases N‐629∕631 prediction

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Figure 10

Irradiated size corrected fracture toughness data from German database (5), with valid T0ref values and ΔT41J determined according to R. G. 1.99, compared to code cases N‐629∕631 prediction, without a margin term

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