Moessbauer and Positron Annihilation Spectroscopy Applied to WWER-1000 RPV Steels

Journal Article · Tue Apr 26 04:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1923676· OSTI ID:20722152

Slugen, V; Lipka, J ^[1]; Zeman, A ^[1]; Debarberis, L ^[2]

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1. Department of Nuclear Physics and Technology, Slovak University of Technology, Ilkovicova 3, 81219 Bratislava (Slovakia)
2. Institute for Energy, Joint Research Centre of the European Commission, P.O. Box 2, 1755ZG Petten (Netherlands)

Moessbauer spectroscopy (MS) and Positron annihilation spectroscopy (PAS) were applied in the evaluation of the microstructure parameters and degradation processes of nuclear reactor pressure vessel (RPV) steel surveillance specimens. Study was oriented to the material investigation of Russian WWER-1000 steels (15Kh2MNFAA and 12Kh2N2MAA) with higher Ni content (1.26 wt.% in base metal and 1.7 wt.% in weld). For comparison, the WWER-440 weld metal (Sv10KhMFT) without Ni was measured too. Specimens were studied in as received form, after irradiation in LVR-15 experimental reactor to the neutron fluence F(E>0.5 MeV) = 1.47x1024 m-2s-1 and after annealing process in vacuum at 475 deg. C/2h. Changes due to different chemical composition and due to irradiation were registered using MS. Post-irradiation thermal treatment and annealing of defects was well detected by different PAS techniques. Results confirm the hypothesis that Ni affects size (decrease) and distribution (more homogeneous) of the Cu- and P-rich clusters and MxCx carbides.

• OSTI ID: 20722152
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 765; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
ANNIHILATION
CARBIDES
CHEMICAL COMPOSITION
COPPER ALLOYS
CRYSTAL STRUCTURE
KEV RANGE 100-1000
LVR-15 REACTOR
MICROSTRUCTURE
MOESSBAUER EFFECT
NEUTRON FLUENCE
NICKEL ALLOYS
PHOSPHORUS ADDITIONS
PHYSICAL RADIATION EFFECTS
POSITRONS
PRESSURE VESSELS
REACTOR MATERIALS
SPECTROSCOPY
STEELS
WELDED JOINTS