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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

## Abstract

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 $T0$.

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## Figures

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)

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)

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)

Figure 11

Euro curve database T0 from KIC data

Figure 10

Euro curve database, T0 from KJC data

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

Figure 8

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

Figure 7

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

Figure 6

Evaluation of base material KS05 in three different irradiation conditions

Figure 5

Presentation of the German RPV database fracture toughness values KJC

Figure 4

HSST 02 database, T0 from KJC (ASTM E1921)

Figure 3

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

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)

Figure 20

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

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)

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)

Figure 15

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

Figure 14

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

Figure 13

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

Figure 12

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

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