IAEA coordinated research project on master curve approach to monitor fracture toughness of RPV steels

Final results of the experimental exercise to support constraint effects

R.K. Nanstad, M. Brumovský, R.H. Callejas, F. Gillemot, M. Korshunov, B.S. Lee, E. Lucon, M. Scibetta, P. Minnebo, K.-F. Nilsson, N. Miura, K. Onizawa, T. Planman, W. Server, B. Burgos, M. Serrano, H.-W. Viehrig

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

4 Citations (Scopus)

Abstract

The precracked Charpy single-edge notched bend, SE(B), specimen (PCC) is the most likely specimen type to be used for determination of the reference temperature, T0, with reactor pressure vessel (RPV) surveillance specimens. Unfortunately, for many RPV steels, significant differences have been observed between the T0 temperature for the PCC specimen and that obtained from the 25-mm thick compact specimen [1TC(T)], generally considered the standard reference specimen for T0. This difference in T0 has often been designated a specimen bias effect, and the primary focus for explaining this effect is loss of constraint in the PCC specimen. The International Atomic Energy Agency (IAEA) has developed a coordinated research project (CRP) to evaluate various issues associated with the fracture toughness Master Curve for application to light-water RPVs. Topic Area 1 of the CRP is focused on the issue of test specimen geometry effects, with emphasis on determination of T0 with the PCC specimen and the bias effect. Topic Area 1 has an experimental part and an analytical part. Participating organizations for the experimental part of the CRP performed fracture toughness testing of various steels, including the reference steel JRQ (A533-B-1) often used for IAEA studies, with various types of specimens under various conditions. Additionally, many of the participants took part in a round robin exercise on finite element modeling of the PCVN specimen, discussed in a separate paper. Results from fracture toughness tests are compared with regard to effects of specimen size and type on the reference temperature T0. It is apparent from the results presented that the bias observed between the PCC specimen and larger specimens for Plate JRQ is not nearly as large as that obtained for Plate 13B (−11°C vs −37°C) and for some of the results in the literature (bias values as much as −45°C). This observation is consistent with observations in the literature that show significant variations in the bias that are dependent on the specific materials being tested. There are various methods for constraint adjustments and two methods were used that reduced the bias for Plate 13B from −37°C to −13°C in one case and to − 11°C in the second case. Unfortunately, there is not a consensus methodology available that accounts for the differences observed with different materials. Increasing the Mlim value in the ASTM E-1921 to ensure no loss of constraint for the PCC specimen is not a practicable solution because the PCC specimen is derived from CVN specimens in RPV surveillance capsules and larger specimens are normally not available. Resolution of these differences are needed for application of the master curve procedure to operating RPVs, but the research needed for such resolution is beyond the scope of this CRP.
Original languageEnglish
Title of host publicationASME 2009 Pressure Vessels and Piping Conference
PublisherAmerican Society of Mechanical Engineers ASME
Pages573-585
Volume3: Design and Analysis
ISBN (Print)978-0-7918-4366-6
DOIs
Publication statusPublished - 2010
MoE publication typeA4 Article in a conference publication
EventASME 2009 Pressure Vessels and Piping Conference, PVP 2009 - Prague, Czech Republic
Duration: 26 Jul 200930 Jul 2009

Publication series

Name
Volume3

Conference

ConferenceASME 2009 Pressure Vessels and Piping Conference, PVP 2009
CountryCzech Republic
CityPrague
Period26/07/0930/07/09

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fracture toughness
vessel
steel
energy
temperature
type specimen
research project
reactor
effect
geometry
methodology
modeling
water

Cite this

Nanstad, R. K., Brumovský, M., Callejas, R. H., Gillemot, F., Korshunov, M., Lee, B. S., ... Viehrig, H-W. (2010). IAEA coordinated research project on master curve approach to monitor fracture toughness of RPV steels: Final results of the experimental exercise to support constraint effects. In ASME 2009 Pressure Vessels and Piping Conference (Vol. 3: Design and Analysis, pp. 573-585). American Society of Mechanical Engineers ASME. American Society of Mechanical Engineers. Pressure Vessels and Piping Division. Publication PVP, Vol.. 2009 https://doi.org/10.1115/PVP2009-78022
Nanstad, R.K. ; Brumovský, M. ; Callejas, R.H. ; Gillemot, F. ; Korshunov, M. ; Lee, B.S. ; Lucon, E. ; Scibetta, M. ; Minnebo, P. ; Nilsson, K.-F. ; Miura, N. ; Onizawa, K. ; Planman, T. ; Server, W. ; Burgos, B. ; Serrano, M. ; Viehrig, H.-W. / IAEA coordinated research project on master curve approach to monitor fracture toughness of RPV steels : Final results of the experimental exercise to support constraint effects. ASME 2009 Pressure Vessels and Piping Conference. Vol. 3: Design and Analysis American Society of Mechanical Engineers ASME, 2010. pp. 573-585 (American Society of Mechanical Engineers. Pressure Vessels and Piping Division. Publication PVP, Vol. 2009).
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title = "IAEA coordinated research project on master curve approach to monitor fracture toughness of RPV steels: Final results of the experimental exercise to support constraint effects",
abstract = "The precracked Charpy single-edge notched bend, SE(B), specimen (PCC) is the most likely specimen type to be used for determination of the reference temperature, T0, with reactor pressure vessel (RPV) surveillance specimens. Unfortunately, for many RPV steels, significant differences have been observed between the T0 temperature for the PCC specimen and that obtained from the 25-mm thick compact specimen [1TC(T)], generally considered the standard reference specimen for T0. This difference in T0 has often been designated a specimen bias effect, and the primary focus for explaining this effect is loss of constraint in the PCC specimen. The International Atomic Energy Agency (IAEA) has developed a coordinated research project (CRP) to evaluate various issues associated with the fracture toughness Master Curve for application to light-water RPVs. Topic Area 1 of the CRP is focused on the issue of test specimen geometry effects, with emphasis on determination of T0 with the PCC specimen and the bias effect. Topic Area 1 has an experimental part and an analytical part. Participating organizations for the experimental part of the CRP performed fracture toughness testing of various steels, including the reference steel JRQ (A533-B-1) often used for IAEA studies, with various types of specimens under various conditions. Additionally, many of the participants took part in a round robin exercise on finite element modeling of the PCVN specimen, discussed in a separate paper. Results from fracture toughness tests are compared with regard to effects of specimen size and type on the reference temperature T0. It is apparent from the results presented that the bias observed between the PCC specimen and larger specimens for Plate JRQ is not nearly as large as that obtained for Plate 13B (−11°C vs −37°C) and for some of the results in the literature (bias values as much as −45°C). This observation is consistent with observations in the literature that show significant variations in the bias that are dependent on the specific materials being tested. There are various methods for constraint adjustments and two methods were used that reduced the bias for Plate 13B from −37°C to −13°C in one case and to − 11°C in the second case. Unfortunately, there is not a consensus methodology available that accounts for the differences observed with different materials. Increasing the Mlim value in the ASTM E-1921 to ensure no loss of constraint for the PCC specimen is not a practicable solution because the PCC specimen is derived from CVN specimens in RPV surveillance capsules and larger specimens are normally not available. Resolution of these differences are needed for application of the master curve procedure to operating RPVs, but the research needed for such resolution is beyond the scope of this CRP.",
author = "R.K. Nanstad and M. Brumovsk{\'y} and R.H. Callejas and F. Gillemot and M. Korshunov and B.S. Lee and E. Lucon and M. Scibetta and P. Minnebo and K.-F. Nilsson and N. Miura and K. Onizawa and T. Planman and W. Server and B. Burgos and M. Serrano and H.-W. Viehrig",
year = "2010",
doi = "10.1115/PVP2009-78022",
language = "English",
isbn = "978-0-7918-4366-6",
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publisher = "American Society of Mechanical Engineers ASME",
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Nanstad, RK, Brumovský, M, Callejas, RH, Gillemot, F, Korshunov, M, Lee, BS, Lucon, E, Scibetta, M, Minnebo, P, Nilsson, K-F, Miura, N, Onizawa, K, Planman, T, Server, W, Burgos, B, Serrano, M & Viehrig, H-W 2010, IAEA coordinated research project on master curve approach to monitor fracture toughness of RPV steels: Final results of the experimental exercise to support constraint effects. in ASME 2009 Pressure Vessels and Piping Conference. vol. 3: Design and Analysis, American Society of Mechanical Engineers ASME, American Society of Mechanical Engineers. Pressure Vessels and Piping Division. Publication PVP, vol. 2009, pp. 573-585, ASME 2009 Pressure Vessels and Piping Conference, PVP 2009, Prague, Czech Republic, 26/07/09. https://doi.org/10.1115/PVP2009-78022

IAEA coordinated research project on master curve approach to monitor fracture toughness of RPV steels : Final results of the experimental exercise to support constraint effects. / Nanstad, R.K.; Brumovský, M.; Callejas, R.H.; Gillemot, F.; Korshunov, M.; Lee, B.S.; Lucon, E.; Scibetta, M.; Minnebo, P.; Nilsson, K.-F.; Miura, N.; Onizawa, K.; Planman, T.; Server, W.; Burgos, B.; Serrano, M.; Viehrig, H.-W.

ASME 2009 Pressure Vessels and Piping Conference. Vol. 3: Design and Analysis American Society of Mechanical Engineers ASME, 2010. p. 573-585 (American Society of Mechanical Engineers. Pressure Vessels and Piping Division. Publication PVP, Vol. 2009).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - IAEA coordinated research project on master curve approach to monitor fracture toughness of RPV steels

T2 - Final results of the experimental exercise to support constraint effects

AU - Nanstad, R.K.

AU - Brumovský, M.

AU - Callejas, R.H.

AU - Gillemot, F.

AU - Korshunov, M.

AU - Lee, B.S.

AU - Lucon, E.

AU - Scibetta, M.

AU - Minnebo, P.

AU - Nilsson, K.-F.

AU - Miura, N.

AU - Onizawa, K.

AU - Planman, T.

AU - Server, W.

AU - Burgos, B.

AU - Serrano, M.

AU - Viehrig, H.-W.

PY - 2010

Y1 - 2010

N2 - The precracked Charpy single-edge notched bend, SE(B), specimen (PCC) is the most likely specimen type to be used for determination of the reference temperature, T0, with reactor pressure vessel (RPV) surveillance specimens. Unfortunately, for many RPV steels, significant differences have been observed between the T0 temperature for the PCC specimen and that obtained from the 25-mm thick compact specimen [1TC(T)], generally considered the standard reference specimen for T0. This difference in T0 has often been designated a specimen bias effect, and the primary focus for explaining this effect is loss of constraint in the PCC specimen. The International Atomic Energy Agency (IAEA) has developed a coordinated research project (CRP) to evaluate various issues associated with the fracture toughness Master Curve for application to light-water RPVs. Topic Area 1 of the CRP is focused on the issue of test specimen geometry effects, with emphasis on determination of T0 with the PCC specimen and the bias effect. Topic Area 1 has an experimental part and an analytical part. Participating organizations for the experimental part of the CRP performed fracture toughness testing of various steels, including the reference steel JRQ (A533-B-1) often used for IAEA studies, with various types of specimens under various conditions. Additionally, many of the participants took part in a round robin exercise on finite element modeling of the PCVN specimen, discussed in a separate paper. Results from fracture toughness tests are compared with regard to effects of specimen size and type on the reference temperature T0. It is apparent from the results presented that the bias observed between the PCC specimen and larger specimens for Plate JRQ is not nearly as large as that obtained for Plate 13B (−11°C vs −37°C) and for some of the results in the literature (bias values as much as −45°C). This observation is consistent with observations in the literature that show significant variations in the bias that are dependent on the specific materials being tested. There are various methods for constraint adjustments and two methods were used that reduced the bias for Plate 13B from −37°C to −13°C in one case and to − 11°C in the second case. Unfortunately, there is not a consensus methodology available that accounts for the differences observed with different materials. Increasing the Mlim value in the ASTM E-1921 to ensure no loss of constraint for the PCC specimen is not a practicable solution because the PCC specimen is derived from CVN specimens in RPV surveillance capsules and larger specimens are normally not available. Resolution of these differences are needed for application of the master curve procedure to operating RPVs, but the research needed for such resolution is beyond the scope of this CRP.

AB - The precracked Charpy single-edge notched bend, SE(B), specimen (PCC) is the most likely specimen type to be used for determination of the reference temperature, T0, with reactor pressure vessel (RPV) surveillance specimens. Unfortunately, for many RPV steels, significant differences have been observed between the T0 temperature for the PCC specimen and that obtained from the 25-mm thick compact specimen [1TC(T)], generally considered the standard reference specimen for T0. This difference in T0 has often been designated a specimen bias effect, and the primary focus for explaining this effect is loss of constraint in the PCC specimen. The International Atomic Energy Agency (IAEA) has developed a coordinated research project (CRP) to evaluate various issues associated with the fracture toughness Master Curve for application to light-water RPVs. Topic Area 1 of the CRP is focused on the issue of test specimen geometry effects, with emphasis on determination of T0 with the PCC specimen and the bias effect. Topic Area 1 has an experimental part and an analytical part. Participating organizations for the experimental part of the CRP performed fracture toughness testing of various steels, including the reference steel JRQ (A533-B-1) often used for IAEA studies, with various types of specimens under various conditions. Additionally, many of the participants took part in a round robin exercise on finite element modeling of the PCVN specimen, discussed in a separate paper. Results from fracture toughness tests are compared with regard to effects of specimen size and type on the reference temperature T0. It is apparent from the results presented that the bias observed between the PCC specimen and larger specimens for Plate JRQ is not nearly as large as that obtained for Plate 13B (−11°C vs −37°C) and for some of the results in the literature (bias values as much as −45°C). This observation is consistent with observations in the literature that show significant variations in the bias that are dependent on the specific materials being tested. There are various methods for constraint adjustments and two methods were used that reduced the bias for Plate 13B from −37°C to −13°C in one case and to − 11°C in the second case. Unfortunately, there is not a consensus methodology available that accounts for the differences observed with different materials. Increasing the Mlim value in the ASTM E-1921 to ensure no loss of constraint for the PCC specimen is not a practicable solution because the PCC specimen is derived from CVN specimens in RPV surveillance capsules and larger specimens are normally not available. Resolution of these differences are needed for application of the master curve procedure to operating RPVs, but the research needed for such resolution is beyond the scope of this CRP.

U2 - 10.1115/PVP2009-78022

DO - 10.1115/PVP2009-78022

M3 - Conference article in proceedings

SN - 978-0-7918-4366-6

VL - 3: Design and Analysis

SP - 573

EP - 585

BT - ASME 2009 Pressure Vessels and Piping Conference

PB - American Society of Mechanical Engineers ASME

ER -

Nanstad RK, Brumovský M, Callejas RH, Gillemot F, Korshunov M, Lee BS et al. IAEA coordinated research project on master curve approach to monitor fracture toughness of RPV steels: Final results of the experimental exercise to support constraint effects. In ASME 2009 Pressure Vessels and Piping Conference. Vol. 3: Design and Analysis. American Society of Mechanical Engineers ASME. 2010. p. 573-585. (American Society of Mechanical Engineers. Pressure Vessels and Piping Division. Publication PVP, Vol. 2009). https://doi.org/10.1115/PVP2009-78022