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Uwaba, Tomoyuki
JNC TN9420 2000-005, 28 Pages, 2000/03
JNC-TN9420-2000-005.pdf:0.94MB
In the first phase of the feasibility study, their basic objectives are presentating the feasible image and scenario of development of the FBR cycle system, which is composed of the fast reactor, spent fuel reprocessing and fuel manufacturing facility. In the development of the FBR system in this phase, various ideas of plants are to be studied, which include coolant types such as sodium, heavy metals, gases(CO
, He), wator, and middle or small size of the reactor, and fuel types (MOX, metal and nitride). In this report, as a part of this study, materials used for the core of the helium gas cooled reactor and their integrity (corrosion, mechanical and irradiation property) under high temperature helium atmosphere were investigated from open literatures.
Satmoko, A.*;
JNC TN9400 99-035, 37 Pages, 1999/04
In sodium environment, materia1 316FR stainless steel risks to suffer from carburization. In this study, an analysis using a Fortran program is conducted to evaluate the carbon influence on the creep behavior of 316FR based on experimental results from uni-axial creep test that had been performed at temperature 550
C in sodium environment simulating Fast Breeder Reactor condition. As performed in experiments, two parts are distinguished. At first, elastic-plastic behavior is used to simulate the fact that just before the beginning of creep test, specimen suffers from load or stress much higher than initial yield stress. In second part, creep condition occurs in which the applied load is kept constant. The plastic component should be included, since stresses increase due to section area reduction. For this reason, elastic-plastic-creep behavior is considered. Through time carbon penetration occurs and its concentration is evaluated empirically. This carburization phenomena are assumed to affect in increasing yield stress, decreasing creep strain rate, and increasing creep rupture strength of material. The model is capable of simulating creep test in sodium environment. Material near from surface risks to be carburized. Its material properties change leading to non-uniform distribution of stresses. Those layers of material suffer from stress concentration, and are subject to damage. By introducing a damage criteria, crack initialization can thus be predicted. And even, crack growth can be evaluated. For high stress levels, tensile strength criterion is more important than creep damage criterion. But in low stress levels, the latter gives more influence in fracture. Under high stress, time to rupture of a specimen in sodium environment is shorter than in air. But for stresses lower than 26 kgfmm
, the time to rupture of creep in sodium environment is the same or little longer than in air. Quantitatively, the carburization effect at ...
Iwai, Takashi; Arai, Yasuo; Maeda, Atsushi; ; ; ;
JAERI-M 94-036, 81 Pages, 1994/03
no abstracts in English
Iwai, Takashi; ; Maeda, Atsushi; ; Handa, Nuneo
Nihon Genshiryoku Gakkai-Shi, 34(5), p.455 - 467, 1992/05
Times Cited Count：1 Percentile：17.26(Nuclear Science & Technology)no abstracts in English
Tsuji, Hirokazu; ; Tsukada, Takashi; Nakajima, Hajime
JAERI-M 91-136, 42 Pages, 1991/09
no abstracts in English
C*
PNC TN9410 90-086, 47 Pages, 1990/05
Since stainless steels like SUS 304 and SUS 316 tend to be carburized in sodiun, the grain boundary near surface may be degraded due to carbides precipitation. In order to clarify the effect of the grain boundary degradation upon creep fatigue strength, long term creep fatigue tests of SUS304 stainless steel were performed in carburized sodium, 0btained results are summarized as follows: (1)Creep fatigue life in carburized sodium was nearly equal to that in air, in spite of the fact that severe carburization and carbides precipitation on grain boundary were observed on tested specimen surface. (2)Creep fatigue life calculated using usual linear damage summation rule showed good agreement with experimental results, (3)It was revealed that crack initiation life in carburized sodium was almost the same as that in air, although crack initiated on degraded grain boundary in carburized sodium. (4)The above fact supplies an evidence to justify the concept that creep fatigue crack initiation life in sodium is longer than 1/20 of failure life obtained using small specimens in air, which is basic assumption of our creep fatigue evaluation method. It is conjectured from this study that FBR grade SUS316 stainless steel will show almost the same creep fatigue life as that in air, however, a few creep fatigue tests of FBR grade SUS316 in carburized sudium will be necessary to clarify this conjecture.
Shindo, Masami; Nakajima, Hajime
Journal of Nuclear Materials, 166, p.278 - 286, 1989/00
Times Cited Count：3 Percentile：41.87(Materials Science, Multidisciplinary)no abstracts in English
Shindo, Masami
JAERI-M 86-053, 23 Pages, 1986/03
no abstracts in English
Shindo, Masami; W.J.Quadakkers*; H.Schuster*
Journal of Nuclear Materials, 140, p.94 - 105, 1986/00
Times Cited Count：19 Percentile：85.86(Materials Science, Multidisciplinary)no abstracts in English
; Kondo, Tatsuo
JAERI-M 85-053, 36 Pages, 1985/04
no abstracts in English
Shindo, Masami; Kondo, Tatsuo
JAERI-M 83-118, 18 Pages, 1983/07
no abstracts in English
Shindo, Masami; ; Kondo, Tatsuo
JAERI-M 83-108, 17 Pages, 1983/07
no abstracts in English
Shindo, Masami; ; ; Kondo, Tatsuo
JAERI-M 83-107, 20 Pages, 1983/07
no abstracts in English
*; Ogawa, Yutaka; ; Kondo, Tatsuo
JAERI-M 82-032, 16 Pages, 1982/04
no abstracts in English
Tamura, Manabu*; Kondo, Tatsuo
JAERI-M 9948, 27 Pages, 1982/02
Influence of mechanical surface finishing on corrosion was studied with some austenitic heat resisting alloys exposed to the simulated HTGR helium environment. The exposure tests were made at 900 and 1000C for 500 and 1500h. Contrary to the prediction based on the trend of some conventional experimental results on the oxidation of cold worked material at comparatively low temperatures, severe cold working, e.g. shot-blasting, was found to accelerate oxidation and carburization. Although, in some cases, moderate surface grinding showed results almost comparable to the surface abraded with fine emery papers, most mechanical surface finishing were recognized as to promote oxidation and carburization at 900 and 1000 C in the simulated HTGR helium. The oxide film formed on the ground or shot-blasted specimen tended to spall more easily during cooling after isothermal exposure at 1000C. Based on the metallographic observation mechanisms of the acceleration of oxidation and carburization was discussed. The surface cold work was considered to cause not only enhanced chromium diffusion to the surface but also considerable degree of inhomogeneity of the degree of working in the microscopic scale, resulting in rather rapid oxide build-up and spallation. Some of the surface finishing in practice with severe cold working, thus, were concluded to be harmful to the integrity of HTGR structural components.
; Kondo, Tatsuo
Boshoku Gijutsu, 31(3), p.125 - 132, 1982/00
no abstracts in English
; Kondo, Tatsuo
JAERI-M 8788, 21 Pages, 1980/03
no abstracts in English
JAERI 1258, 45 Pages, 1979/02
no abstracts in English
JAERI-M 6851, 59 Pages, 1976/12
no abstracts in English
; ;
JAERI-M 6088, 22 Pages, 1975/03
no abstracts in English
