SANS response of VVER440-type weld material after neutron irradiation, post-irradiation annealing and reirradiation

Ulbricht, F. Bergner, J. Böhmert, Matti Valo, M.-H. Mathon, A. Heinemann

Research output: Contribution to journalArticleScientificpeer-review

28 Citations (Scopus)

Abstract

It is well accepted that the reirradiation behaviour of reactor pressure vessel (RPV) steel after annealing can be different from the original irradiation behaviour. We present the first small-angle neutron scattering (SANS) study of neutron irradiated, annealed and reirradiated VVER440-type RPV weld material.
The SANS results are analyzed both in terms of the size distribution of irradiation-induced defect/solute atom clusters and in terms of the ratio of total and nuclear scattering intensity in a saturation magnetic field (A ratio). The measured A ratio is compared with calculations performed on the basis of the cluster composition reported for a similar weld material investigated by means of three-dimensional atom probe field ion microscopy.
The observed deviation between both estimates and possible reasons for the discrepancy are discussed.
Special emphasis is placed on the differences between the materials response to the original irradiation and to reirradiation after annealing.
The results indicate that reirradiation-induced clusters are slightly different in their average composition and their formation saturates at a lower volume fraction than in the case of the original irradiation.
Original languageEnglish
Pages (from-to)1855-1870
JournalPhilosophical Magazine
Volume87
Issue number12
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

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neutron irradiation
neutron scattering
irradiation
annealing
pressure vessels
reactors
nuclear scattering
atoms
solutes
steels
microscopy
deviation
saturation
neutrons
probes
defects
estimates
scattering
magnetic fields
ions

Cite this

Ulbricht ; Bergner, F. ; Böhmert, J. ; Valo, Matti ; Mathon, M.-H. ; Heinemann, A. / SANS response of VVER440-type weld material after neutron irradiation, post-irradiation annealing and reirradiation. In: Philosophical Magazine. 2007 ; Vol. 87, No. 12. pp. 1855-1870.
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title = "SANS response of VVER440-type weld material after neutron irradiation, post-irradiation annealing and reirradiation",
abstract = "It is well accepted that the reirradiation behaviour of reactor pressure vessel (RPV) steel after annealing can be different from the original irradiation behaviour. We present the first small-angle neutron scattering (SANS) study of neutron irradiated, annealed and reirradiated VVER440-type RPV weld material. The SANS results are analyzed both in terms of the size distribution of irradiation-induced defect/solute atom clusters and in terms of the ratio of total and nuclear scattering intensity in a saturation magnetic field (A ratio). The measured A ratio is compared with calculations performed on the basis of the cluster composition reported for a similar weld material investigated by means of three-dimensional atom probe field ion microscopy. The observed deviation between both estimates and possible reasons for the discrepancy are discussed. Special emphasis is placed on the differences between the materials response to the original irradiation and to reirradiation after annealing. The results indicate that reirradiation-induced clusters are slightly different in their average composition and their formation saturates at a lower volume fraction than in the case of the original irradiation.",
author = "Ulbricht and F. Bergner and J. B{\"o}hmert and Matti Valo and M.-H. Mathon and A. Heinemann",
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SANS response of VVER440-type weld material after neutron irradiation, post-irradiation annealing and reirradiation. / Ulbricht; Bergner, F.; Böhmert, J.; Valo, Matti; Mathon, M.-H.; Heinemann, A.

In: Philosophical Magazine, Vol. 87, No. 12, 2007, p. 1855-1870.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - SANS response of VVER440-type weld material after neutron irradiation, post-irradiation annealing and reirradiation

AU - Ulbricht, null

AU - Bergner, F.

AU - Böhmert, J.

AU - Valo, Matti

AU - Mathon, M.-H.

AU - Heinemann, A.

PY - 2007

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N2 - It is well accepted that the reirradiation behaviour of reactor pressure vessel (RPV) steel after annealing can be different from the original irradiation behaviour. We present the first small-angle neutron scattering (SANS) study of neutron irradiated, annealed and reirradiated VVER440-type RPV weld material. The SANS results are analyzed both in terms of the size distribution of irradiation-induced defect/solute atom clusters and in terms of the ratio of total and nuclear scattering intensity in a saturation magnetic field (A ratio). The measured A ratio is compared with calculations performed on the basis of the cluster composition reported for a similar weld material investigated by means of three-dimensional atom probe field ion microscopy. The observed deviation between both estimates and possible reasons for the discrepancy are discussed. Special emphasis is placed on the differences between the materials response to the original irradiation and to reirradiation after annealing. The results indicate that reirradiation-induced clusters are slightly different in their average composition and their formation saturates at a lower volume fraction than in the case of the original irradiation.

AB - It is well accepted that the reirradiation behaviour of reactor pressure vessel (RPV) steel after annealing can be different from the original irradiation behaviour. We present the first small-angle neutron scattering (SANS) study of neutron irradiated, annealed and reirradiated VVER440-type RPV weld material. The SANS results are analyzed both in terms of the size distribution of irradiation-induced defect/solute atom clusters and in terms of the ratio of total and nuclear scattering intensity in a saturation magnetic field (A ratio). The measured A ratio is compared with calculations performed on the basis of the cluster composition reported for a similar weld material investigated by means of three-dimensional atom probe field ion microscopy. The observed deviation between both estimates and possible reasons for the discrepancy are discussed. Special emphasis is placed on the differences between the materials response to the original irradiation and to reirradiation after annealing. The results indicate that reirradiation-induced clusters are slightly different in their average composition and their formation saturates at a lower volume fraction than in the case of the original irradiation.

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VL - 87

SP - 1855

EP - 1870

JO - Philosophical Magazine

JF - Philosophical Magazine

SN - 1478-6435

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