scholarly journals Investigation of effects of long-term thermal aging on magnetization process in low-alloy pressure vessel steels using first-order-reversal-curves

AIP Advances ◽  
2016 ◽  
Vol 7 (5) ◽  
pp. 056002 ◽  
Author(s):  
Satoru Kobayashi ◽  
Ferenc Gillemot ◽  
Ákos Horváth ◽  
Márta Horváth ◽  
László Almásy ◽  
...  
Keyword(s):  
Thermal Aging ◽  
Pressure Vessel ◽  
Magnetization Process ◽  
First Order ◽  
Pressure Vessel Steels

Effect of long-term thermal aging on magnetic property in reactor pressure vessel steels

2013 ◽  
Vol 439 (1-3) ◽  
pp. 131-136 ◽  
Author(s):  
S. Kobayashi ◽  
H. Sato ◽  
T. Iwawaki ◽  
T. Yamamoto ◽  
D. Klingensmith ◽  
...  
Keyword(s):  
Magnetic Property ◽  
Thermal Aging ◽  
Pressure Vessel ◽  
Reactor Pressure Vessel ◽  
Pressure Vessel Steels ◽  
Reactor Pressure

Assessment of segregation kinetics in water-moderated reactors pressure vessel steels under long-term operation

2016 ◽  
Vol 477 ◽  
pp. 110-122 ◽  
Author(s):  
E.A. Kuleshova ◽  
B.A. Gurovich ◽  
Z.V. Lavrukhina ◽  
M.A. Saltykov ◽  
S.V. Fedotova ◽  
...  
Keyword(s):  
Pressure Vessel ◽  
Term Operation ◽  
Pressure Vessel Steels

scholarly journals Effect of long-term thermal aging on magnetic hysteresis for low-alloy pressure vessel steel

2017 ◽  
Vol 903 ◽  
pp. 012049
Author(s):  
Satoru Kobayashi ◽  
Ferenc Gillemot ◽  
Ákos Horváth ◽  
Marta Horváth ◽  
Almásy László
Keyword(s):  
Thermal Aging ◽  
Pressure Vessel ◽  
Magnetic Hysteresis ◽  
Pressure Vessel Steel ◽  
Vessel Steel

Industry Practice for the Neutron Irradiation Embrittlement of Reactor Pressure Vessel Steels in Japan

2009 ◽  
Author(s):  
Norimichi Yamashita ◽  
Masanobu Iwasaki ◽  
Koji Dozaki ◽  
Naoki Soneda
Keyword(s):  
Neutron Irradiation ◽  
Pressure Vessel ◽  
Correlation Method ◽  
Surveillance Data ◽  
Surveillance Program ◽  
Irradiation Embrittlement ◽  
Term Operation ◽  
Pressure Vessel Steels ◽  
Reactor Pressure

Neutron irradiation embrittlement of reactor pressure vessel steels (RPVs) is one of the important material ageing issues. In Japan, almost 40 years have past since the first plant started its commercial operation, and several plants are expected to become beyond 40 years old in the near future. Thus, the safe operation based on the appropriate recognition of the neutron irradiation embrittlement is inevitable to ensure the structural integrity of RPVs. The amount of the neutron irradiation embrittlement of RPV steels has been monitored and predicted by the complementally use of surveillance program and embrittlement correlation method. Recent surveillance data suggest some discrepancies between the measurements and predictions of the embrittlement in some old BWR RPV steels with high impurity content. Some discrepancies of PWR RPV surveillance data from the predictions have also been recognized in the embrittlement trend. Although such discrepancies are basically within a scatter band, the increasing necessity of the improvement of the predictive capability of the embrittlement correlation method has been emphasized to be prepared for the future long term operation. Regarding the surveillance program, on the other hand, only one original surveillance capsule, except for the reloaded capsules containing Charpy broken halves, is available in some BWR plants. This situation strongly pushed establishing a new code for a new surveillance program, where the use of the reloading and reconstitution of the tested specimens is specified. The Japan Electric Association Code, JEAC 4201–2007 “Method of Surveillance Tests for Structural Materials of Nuclear Reactors,” was revised in December, 2007, in order to address these issues. A new mechanism-guided embrittlement correlation method was adopted. The surveillance program was modified for the long term operation of nuclear plants by introducing the “long-term surveillance program”, which is to be applied for the operation beyond 40 years. The use of the reloading, re-irradiation and reconstitution of the tested Charpy/fracture toughness specimens is also specified in the new revision. This paper reports the application and practice of the JEAC4201–2007 in terms of the prediction of embrittlement and the use of tested surveillance specimens in Japan.

Magnetic investigations on irradiation-induced nanoscale precipitation in reactor pressure vessel steels: A first-order reversal curve study

2021 ◽  
Vol 552 ◽  
pp. 152973
Author(s):  
Satoru Kobayashi ◽  
Hiroaki Murakami ◽  
Takuya Yamamoto ◽  
G. Robert Odette ◽  
Ákos Horváth ◽  
...  
Keyword(s):  
Pressure Vessel ◽  
Reactor Pressure Vessel ◽  
First Order ◽  
Pressure Vessel Steels ◽  
Reactor Pressure
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