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Research Papers: Materials and Fabrication

Validation of RTT0 for German Reactor Pressure Vessel Steels

[+] Author and Article Information
Dieter Siegele

 Fraunhofer Institut für Werkstoffmechanik, 79108 Freiburg, Germany

Elisabeth Keim

 AREVA NP GmbH, 91052 Erlangen, Germany

Gerhard Nagel

 EON Kernkraft GmbH, 30457 Hannover, Germany

J. Pressure Vessel Technol 130(3), 031405 (Jun 12, 2008) (6 pages) doi:10.1115/1.2937737 History: Received January 27, 2006; Revised December 02, 2006; Published June 12, 2008

For the introduction of the new reference temperature RTT0 of the ASME Code Cases N-629 and N-631 into the German Standard KTA 3201.2, the applicability of RTT0 was validated by the reevaluation of the existing fracture toughness database of German reactor pressure vessel. (RPV) steels including unirradiated and irradiated base materials and weld metal data. The test temperatures of the database were standardized to the reference temperature T0 of the master curve of the data sets and the database was compared with the ASME KIC-curve as adjusted by RTT0. The KIC-curve adjusted by RTT0 enveloped both the 1T-size adjusted database and also the as-measured database, corresponding to the definition of RTT0. Thus, the results also prove the validity of the KIC(RTT0)-curve for allowable flaw sizes and up to the crack length spectrum of the ASME KIC-database without size adjustment of T0. The results of both investigations confirmed the validity of RTT0 for German RPV steels. The majority of existing fracture toughness data are based on KIC-values. More recent data are (KJC) related to the issuing of ASTM E 1921 in 1997 and to the success of the master curve-based T0 approach. Therefore, the possible difference between T0 determined from KJC and from KIC was investigated with available databases for RPV steels. The comparison of T0(KJC) and T0(KIC) showed a 1:1 correlation proving the equivalence of KJC and KIC in the determination of T0.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Fracture surfaces of a C(T)50 specimen failed at KIC=102MPa∕m (Material 22 NiMoCr 37 (A 508 Cl 2) forging, initiation sites marked by arrows)

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Figure 2

Fracture surfaces of a SE(B) specimen failed at KJC=106MPa∕m (Material 22 NiMoCr 37 (A 508 Cl 2) forging, initiation sites marked by arrows)

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Figure 3

HSST 02 database, T0 from KIC (ASTM E 399)

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Figure 4

HSST 02 database, T0 from KJC (ASTM E1921)

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Figure 5

Presentation of the German RPV database fracture toughness values KJC

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Figure 6

Evaluation of base material KS05 in three different irradiation conditions

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Figure 7

Material data set KS05 at the fluence level of Φ=2.5×1019n∕cm2(E>1MeV)

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Figure 8

Reevaluated data sets KS05 applying a bimodal analysis for data set with a fluence Φ=2.5×1019n∕cm2(E>1MeV)

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Figure 9

Reevaluation of the base material KS05 for all three irradiation conditions normalized versus T-T0; data set with a fluence Φ=2.5×1019n∕cm−2(E>1MeV) has been evaluated using a bimodal analysis

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Figure 10

Euro curve database, T0 from KJC data

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Figure 11

Euro curve database T0 from KIC data

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Figure 12

WPS1 database, T0 from KJC data, and C(T) and SE(B) specimens

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Figure 13

WPS1 database, T0 from KIC data, and C(T) and SE(B) specimens

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Figure 14

WPS1 database, specimen type effect, and T0 from C(T) specimens

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Figure 15

WPS1 database, specimen type effect, and T0 from SE(B) specimens

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Figure 16

22 NiMoCr 3 7 (A 508, Cl 2) plate database, and T0 from KJC (all data, Q&T property profile effect not eliminated)

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Figure 17

22 NiMoCr 3 7 (A 508, Cl 2) plate database, and T0 from KIC (all data, Q&T property profile effect not eliminated)

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Figure 18

22 NiMoCr 3 7 (A 508, Cl 2) plate database, T0 from KJC, and 25mm and 50mm data only (Q&T property profile effect eliminated)

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Figure 19

22 NiMoCr 3 7 (A 508, Cl 2) plate database, T0 from KIC, and 25mm and 50mm data only (Q&T property profile effect eliminated)

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Figure 20

T0(KJC) and T0(KIC) for all data bases investigated with straight equality line and 5°C scatter band

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