Material characterisation and selection for the international research project “PRIMAVERA”

A. Chernobaeva, J. Shtrombah, A. Krjukov, D. Erak, P. Platonov, J. Nikolaev, E. Krasikov, L. Debarberis, Yu. Kohopaa, Matti Valo, Vodenicharov

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

The international research project “PRIMAVERA” aims to develop a physically validated prediction model for the transition temperature shift dependence (ΔTK) of VVER-400 weld metals versus neutron fluence after reactor pressure vessel annealing. The reactor pressure vessel of VVER type has several ring welds between the forgings, characterised by large overall dimensions, structural heterogeneity and mechanical properties variations.
The weld metal is a mild low-alloy steel with rather complex structure depending on chemical composition, manufacturing technology and heat treatment and the selection of the weld sample is crucial for the success of the project.
A weld with high phosphorus content manufactured following standard VVER-440/230 weld technology, has been identified and selected for the project. The detailed characterisation of the selected weld in the un-irradiated condition is the first phase of the research programme and is presented in this paper.
Significant phosphorus content variations through the weld could be identified; from 0.022 to 0.044 wt%. Only small variations in mechanical properties were identified; a maximum of 13 °C difference in ductile to brittle transition temperature, mainly related to the distance to the fusion boundary and the base metal.
The study also showed that testing of 14 Charpy specimens is sufficient for a correct evaluation of transition temperature. A larger number of tests are required for base metal compared with the weld metal.
Original languageEnglish
Pages (from-to)151-158
JournalInternational Journal of Pressure Vessels and Piping
Volume84
Issue number3
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

Fingerprint

Welds
Metals
Superconducting transition temperature
Pressure vessels
Phosphorus
Mechanical properties
Forgings
High strength steel
Structural properties
Neutrons
Fusion reactions
Heat treatment
Annealing
Testing
Chemical analysis

Keywords

  • RPV
  • embrittlement
  • reactor pressure vessel embrittlement
  • annealing
  • reactor pressure vessel
  • welding
  • welds
  • WWER-440 weld
  • PRIMAVERA
  • phosphorus

Cite this

Chernobaeva, A., Shtrombah, J., Krjukov, A., Erak, D., Platonov, P., Nikolaev, J., ... Vodenicharov (2007). Material characterisation and selection for the international research project “PRIMAVERA”. International Journal of Pressure Vessels and Piping, 84(3), 151-158. https://doi.org/10.1016/j.ijpvp.2006.09.016
Chernobaeva, A. ; Shtrombah, J. ; Krjukov, A. ; Erak, D. ; Platonov, P. ; Nikolaev, J. ; Krasikov, E. ; Debarberis, L. ; Kohopaa, Yu. ; Valo, Matti ; Vodenicharov. / Material characterisation and selection for the international research project “PRIMAVERA”. In: International Journal of Pressure Vessels and Piping. 2007 ; Vol. 84, No. 3. pp. 151-158.
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author = "A. Chernobaeva and J. Shtrombah and A. Krjukov and D. Erak and P. Platonov and J. Nikolaev and E. Krasikov and L. Debarberis and Yu. Kohopaa and Matti Valo and Vodenicharov",
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Chernobaeva, A, Shtrombah, J, Krjukov, A, Erak, D, Platonov, P, Nikolaev, J, Krasikov, E, Debarberis, L, Kohopaa, Y, Valo, M & Vodenicharov 2007, 'Material characterisation and selection for the international research project “PRIMAVERA”', International Journal of Pressure Vessels and Piping, vol. 84, no. 3, pp. 151-158. https://doi.org/10.1016/j.ijpvp.2006.09.016

Material characterisation and selection for the international research project “PRIMAVERA”. / Chernobaeva, A.; Shtrombah, J.; Krjukov, A.; Erak, D.; Platonov, P.; Nikolaev, J.; Krasikov, E.; Debarberis, L.; Kohopaa, Yu.; Valo, Matti; Vodenicharov.

In: International Journal of Pressure Vessels and Piping, Vol. 84, No. 3, 2007, p. 151-158.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Material characterisation and selection for the international research project “PRIMAVERA”

AU - Chernobaeva, A.

AU - Shtrombah, J.

AU - Krjukov, A.

AU - Erak, D.

AU - Platonov, P.

AU - Nikolaev, J.

AU - Krasikov, E.

AU - Debarberis, L.

AU - Kohopaa, Yu.

AU - Valo, Matti

AU - Vodenicharov, null

PY - 2007

Y1 - 2007

N2 - The international research project “PRIMAVERA” aims to develop a physically validated prediction model for the transition temperature shift dependence (ΔTK) of VVER-400 weld metals versus neutron fluence after reactor pressure vessel annealing. The reactor pressure vessel of VVER type has several ring welds between the forgings, characterised by large overall dimensions, structural heterogeneity and mechanical properties variations. The weld metal is a mild low-alloy steel with rather complex structure depending on chemical composition, manufacturing technology and heat treatment and the selection of the weld sample is crucial for the success of the project. A weld with high phosphorus content manufactured following standard VVER-440/230 weld technology, has been identified and selected for the project. The detailed characterisation of the selected weld in the un-irradiated condition is the first phase of the research programme and is presented in this paper.Significant phosphorus content variations through the weld could be identified; from 0.022 to 0.044 wt%. Only small variations in mechanical properties were identified; a maximum of 13 °C difference in ductile to brittle transition temperature, mainly related to the distance to the fusion boundary and the base metal. The study also showed that testing of 14 Charpy specimens is sufficient for a correct evaluation of transition temperature. A larger number of tests are required for base metal compared with the weld metal.

AB - The international research project “PRIMAVERA” aims to develop a physically validated prediction model for the transition temperature shift dependence (ΔTK) of VVER-400 weld metals versus neutron fluence after reactor pressure vessel annealing. The reactor pressure vessel of VVER type has several ring welds between the forgings, characterised by large overall dimensions, structural heterogeneity and mechanical properties variations. The weld metal is a mild low-alloy steel with rather complex structure depending on chemical composition, manufacturing technology and heat treatment and the selection of the weld sample is crucial for the success of the project. A weld with high phosphorus content manufactured following standard VVER-440/230 weld technology, has been identified and selected for the project. The detailed characterisation of the selected weld in the un-irradiated condition is the first phase of the research programme and is presented in this paper.Significant phosphorus content variations through the weld could be identified; from 0.022 to 0.044 wt%. Only small variations in mechanical properties were identified; a maximum of 13 °C difference in ductile to brittle transition temperature, mainly related to the distance to the fusion boundary and the base metal. The study also showed that testing of 14 Charpy specimens is sufficient for a correct evaluation of transition temperature. A larger number of tests are required for base metal compared with the weld metal.

KW - RPV

KW - embrittlement

KW - reactor pressure vessel embrittlement

KW - annealing

KW - reactor pressure vessel

KW - welding

KW - welds

KW - WWER-440 weld

KW - PRIMAVERA

KW - phosphorus

U2 - 10.1016/j.ijpvp.2006.09.016

DO - 10.1016/j.ijpvp.2006.09.016

M3 - Article

VL - 84

SP - 151

EP - 158

JO - International Journal of Pressure Vessels and Piping

JF - International Journal of Pressure Vessels and Piping

SN - 0308-0161

IS - 3

ER -