Influence of high fluence irradiation on reference temperature of VVER-440 RPV surveillance specimens
Source abstract
Abstract
Master curve (MC) testing of VVER-440 RPV surveillance specimens treated for 27 years (∼200,000 h) in a surveillance channel of Metsamor-NPP was performed to investigate the influence of long term high fluence irradiation on RPV embrittlement. The surveillance chain consisted of both thermal aged specimens (above the core level) and irradiated specimens (inside the core). The reference temperature ( To) values obtained from irradiated specimens are compared with the results from thermal aged specimens to characterize irradiation induced shifts in To values for both base and weld metal specimens. It was found that the high fluence irradiation up to a nominal fluence of 3.2 × 10 25 n.m -2 at E > 0.5 MeV resulted large embrittlement with To shift values greater than 300 °C for both base and weld metal specimens. The obtained shifts in To values at these high fluence values were used to compare with the predictions from PNAE procedure in the Russian regulatory guide outside its validity range. It was found that the measured shift in reference temperature for the weld metal was well below the predicted value while, the shift in reference temperature for base metal was largely under-predicted at these high fluence values.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fusion materials and technologies · Nuclear Materials and Properties · Nuclear reactor physics and engineering
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
Show source-provided references
1. TEM and PAS study of neutron irradiated VVER-type RPV steels10.1016/S0022-3115(02)00800-0 ↗
2. Contribution of irradiation-induced defects to hardening of a low-copper reactor pressure vessel steel10.1016/j.actamat.2018.06.015 ↗
3. Atom probe tomography of 15Kh2MFA Cr-Mo-V steel surveillance specimens10.1016/S0968-4328(00)00082-2 ↗
4. Analysis of embrittlement of WWER-1000 RPV materials10.1016/j.ijpvp.2011.11.003 ↗
5. Thermal aging effects of VVER-1000 weld metal under operation temperature
6. H. Gunawardane, B. Hall and S. Rosinski, "Mechanical property changes in reactor vessel materials thermally aged for 209000 H at 282°C", in 22nd Symp. Eff. Radiat. Mater., ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, n.d.: pp. 236–236–9..10.1520/STP37581S ↗
7. Investigation of thermal ageing in long term operated RPV materials
8. Thermal ageing mechanizms of WWER-1000 reactor pressure vessel steels10.1016/j.jnucmat.2014.05.059 ↗
9. Characterization of phosphorus segregation in neutron-irradiated Russian pressure vessel steel weld10.1016/0022-3115(94)00667-9 ↗
10. Embrittlement of low copper VVER 440 surveillance samples neutron-irradiated to high fluences10.1016/S0022-3115(00)00240-3 ↗
11. Mechanical Properties and microstructure of long term aged WWER 440 RPV steel10.1016/j.jnucmat.2017.01.007 ↗
12. Mechanical properties and microstructure of VVER 440 RPV steels irradiated to extremely high fluences and the effect of recovery annealing10.1016/j.jnucmat.2021.152951 ↗
13. Contributions of Cu-rich clusters, dislocation loops and nanovoids to the irradiation-induced hardening of Cu-bearing low-Ni reactor pressure vessel steels10.1016/j.jnucmat.2015.02.031 ↗
14. Influence of different chemical elements on irradiation-induced hardening embrittlement of RPV steels10.1016/j.jnucmat.2008.06.030 ↗
15. Effects of chemical composition and dose on microstructure evolution and hardening of neutron-irradiated reactor pressure vessel steels10.1016/j.jnucmat.2010.04.008 ↗
16. Evolution of manganese–nickel–silicon-dominated phases in highly irradiated reactor pressure vessel steels10.1016/j.actamat.2014.07.040 ↗
17. Non-hardening embrittlement mechanism of pressure vessel steel Ni-Cr-Mo-V welds during thermal aging
18. Irradiation embrittlement assessment and prediction of Armenian NPP reactor pressure vessel steels10.1016/j.nucengdes.2013.12.065 ↗
19. Check of Master Curve application to embrittled RPVs of WWER type reactors10.1016/S0308-0161(02)00074-1 ↗
20. The master curve method: a new concept for brittle fracture10.1504/IJMPT.1999.036276 ↗
21. Critical assessment of the Rolfe-Novak CVN-KIC upper shelf correlation10.1016/j.engfracmech.2021.108117 ↗
22. The quantitative relationship between fracture toughness and impact toughness in high-strength steels10.1016/j.engfracmech.2019.03.003 ↗
23. CVN–KJC correlation model for API X65 gas pipeline10.1016/j.engfailanal.2017.04.007 ↗
24. Regression-based CVN–KIC Models for hot work tool steels10.1016/j.msea.2006.05.103 ↗
25. A modified correlation between KJIC and Charpy V-notch impact energy of Chinese SA508-III steel at the upper shelf10.1016/j.jnucmat.2018.03.056 ↗
26. Structural MATerias research on parameters influencing the material properties of RPV steels for safe long-term operation of PWR NPPs10.1016/j.nucengdes.2023.112236 ↗
27. "PNAE-G0002-86 Standard for Strength Calculations of Components and Piping in NPPs," PN AE G-7 002-86m Energoatomizdat, Moscow, 1989.
28. Development of reconstitution technique and testing of reconstituted bending bars in hot cell
29. "E1921 − 20, Standard test method for determination of reference temperature, to, for ferritic steels in the transition range," ASTM, 2020.
30. "FRACTESUS H2020 project".
31. Radiation induced microstructural evolution in reactor pressure vessel steels
32. Embrittlement of Nuclear Reactor Pressure Vessels10.1007/s11837-001-0081-0 ↗
33. E.D. Eason, G.R. Odette, R.K. Nanstad and T.A. Yamamoto, "Physicallybasedcorrelationofirradiation-inducedtransition temperature shifts for RPV steels.," ORNL/TM2006/530; ORNL;, 2006.10.2172/941022 ↗
34. Structural characterization of nanoscale intermetallic precipitates in highly neutron irradiated reactor pressure vessel steels10.1016/j.scriptamat.2015.10.019 ↗
35. Microstructural aspects of irradiation damage in A508 Gr 4N forging steel: composition and flux effects
36. Post-irradiation annealing of Ni-Mn-Si-enriched clusters in a neutron-irradiated RPV steel weld using Atom Probe Tomography