scholarly journals Three Dimensional Atom Probe Observations of Reactor Pressure Vessel Model Alloys Irradiated by Neutrons and Heavy Ions

2010 ◽  
Vol 74 (3) ◽  
pp. 191-198 ◽  
Author(s):  
Kenji Dohi ◽  
Kenji Nishida ◽  
Akiyoshi Nomoto ◽  
Naoki Soneda ◽  
Hideo Watanabe
Keyword(s):  
Pressure Vessel ◽  
Heavy Ions ◽  
Three Dimensional ◽  
Atom Probe ◽  
Reactor Pressure Vessel ◽  
Reactor Pressure

scholarly journals 3-D Atom Probe Observation of Solute Atom Clusters in Reactor Pressure Vessel Steels

Materia Japan ◽  
2008 ◽  
Vol 47 (12) ◽  
pp. 619-619
Author(s):  
Kenji Nishida ◽  
Kenji Dohi ◽  
Akiyoshi Nomoto ◽  
Naoki Soneda
Keyword(s):  
Pressure Vessel ◽  
Solute Atom ◽  
Atom Probe ◽  
Reactor Pressure Vessel ◽  
Atom Clusters ◽  
Pressure Vessel Steels ◽  
Reactor Pressure

701 Surveillance Test Specimens of Nuclear Reactor Pressure Vessel Steels analyzed by 3D Atom Probe and Positron Annihilation

2006 ◽  
Vol 2006 (0) ◽  
pp. 379-380
Author(s):  
Yasuyoshi NAGAI ◽  
Takeshi TOYAMA ◽  
Zheng TANG ◽  
Masayuki HASEGAWA ◽  
Abderrahim Almazouzi ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Pressure Vessel ◽  
Nuclear Reactor ◽  
Atom Probe ◽  
Reactor Pressure Vessel ◽  
Pressure Vessel Steels ◽  
Reactor Pressure

Development of a Three-Dimensional Green’s Function and Its Application to the Fatigue Evaluation of Reactor Pressure Vessel

2006 ◽  
Author(s):  
M. Y. Ahn ◽  
J. C. Kim ◽  
Y. S. Chang ◽  
J. B. Choi ◽  
Y. J. Kim ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Green’S Function ◽  
Green's Function ◽  
Pressure Vessel ◽  
Three Dimensional ◽  
Reactor Pressure Vessel ◽  
Element Analysis ◽  
Reactor Pressure

The design of major nuclear components for the prevention of fatigue failure has been achieved on the basis of ASME codes, which are usually very conservative. However, it is necessary to make it more accurate for the continued operation beyond the design life. In this paper, 3-dimensional stress and fatigue analyses reflecting entire geometry have been carried out. The number of operating transient data obtained from a monitoring system were filtered and analyzed. Then, Green’s function which transfers temperature gradient into the corresponding thermal stress is proposed and applied to critical locations of a reactor pressure vessel. The validity of proposed Green’s function is approved by comparing the result with corresponding 3-D finite element analysis results. Also, the amount of conservatism included in design transients in comparison with real transients is analyzed. The results for 3-D finite element analysis are also compared with corresponding 2-D finite element analysis results, and a considerable amount of difference was observed in terms of fatigue life. Therefore, it is expected that the proposed evaluation scheme adopting real operating data and Green’s function can provide more accurate fatigue life evaluation for a reactor pressure vessel.

Atom Probe Tomography characterization of the microstructural evolution of a low copper reactor pressure vessel steel under neutron irradiation

2010 ◽  
Vol 1264 ◽  
Author(s):  
Hefei Huang ◽  
Bertrand Radiguet ◽  
Patrick Todeschini ◽  
Guillaume Chas ◽  
Philippe Pareige
Keyword(s):  
Neutron Irradiation ◽  
Pressure Vessel ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Reactor Pressure Vessel ◽  
Surveillance Program ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Reactor Pressure Vessel Steel ◽  
Reactor Pressure

AbstractA low copper reactor pressure vessel steel was characterised by atom probe tomography after neutron irradiation at different fluences. The specimens were irradiated within the frame of the Surveillance Program of a production reactor. Roughly spherical clusters enriched in nickel, manganese, silicon and, in a lesser extent, phosphorus and copper were observed at all fluences. The chemical composition of these clusters shows no evolution with fluence, as well as their diameter, close to 3 nm. Their number density increases linearly with the neutron fluence. A continuous segregation of the elements found in the clusters is also observed along dislocation lines, with similar enrichments.

scholarly journals Diffusivity and Solubility of Cu in a Reactor Pressure Vessel Steel Studied by Atom Probe Tomography

2015 ◽  
Vol 56 (9) ◽  
pp. 1513-1516 ◽  
Author(s):  
Masaki Shimodaira ◽  
Takeshi Toyama ◽  
Fumihiko Takahama ◽  
Naoki Ebisawa ◽  
Yasuko Nozawa ◽  
...  
Keyword(s):  
Pressure Vessel ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Reactor Pressure Vessel ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Reactor Pressure Vessel Steel ◽  
Reactor Pressure

Atom probe tomography of reactor pressure vessel steels: An analysis of data integrity

2011 ◽  
Vol 111 (6) ◽  
pp. 676-682 ◽  
Author(s):  
J.M. Hyde ◽  
M.G. Burke ◽  
B. Gault ◽  
D.Wf. Saxey ◽  
P. Styman ◽  
...  
Keyword(s):  
Pressure Vessel ◽  
Atom Probe Tomography ◽  
Data Integrity ◽  
Atom Probe ◽  
Reactor Pressure Vessel ◽  
Pressure Vessel Steels ◽  
Reactor Pressure
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