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JAEA Reports

Investigation of the properties of high temperature resistance alloys used in the helium gas cooled high temperature reactor

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$$_{2}$$, 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.

JAEA Reports

Simulation of creep test on 316FR stainless steel in sodium environment at 550$$^{circ}C$$

Satmoko, A.*;

JNC-TN9400 99-035, 37 Pages, 1999/04

JNC-TN9400-99-035.pdf:1.54MB

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$$^{circ}$$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$$^{2}$$, the time to rupture of creep in sodium environment is the same or little longer than in air. Quantitatively, the carburization effect at ...

JAEA Reports

Post irradiation examination of 84F-12A capsule containing uranium-plutonium mixed carbide fuels

Iwai, Takashi; Arai, Yasuo; Maeda, Atsushi; ; ; ;

JAERI-M 94-036, 81 Pages, 1994/03

JAERI-M-94-036.pdf:3.81MB

no abstracts in English

Journal Articles

Performance of uranium-plutonium mixed carbide fuel irradiated to low burnup

Iwai, Takashi; ; Maeda, Atsushi; ; Handa, Nuneo

Nippon Genshiryoku Gakkai-Shi, 34(5), p.455 - 467, 1992/05

 Times Cited Count:1 Percentile:81.96(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Effect of minor elements on corrosion behavior of Ni-Cr-W superalloys in HTGR helium

Tsuji, Hirokazu; ; Tsukada, Takashi; Nakajima, Hajime

JAERI-M 91-136, 42 Pages, 1991/09

JAERI-M-91-136.pdf:3.23MB

no abstracts in English

JAEA Reports

Creep fatigue behavior of SUS 304 Stainless steel tested in sodium at 550$$^{circ}$$C

*

PNC-TN9410 90-086, 47 Pages, 1990/05

PNC-TN9410-90-086.pdf:1.76MB

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.

Journal Articles

Carburization behaviour of high temperature alloys in carburizing environment

Shindo, Masami; Nakajima, Hajime

Journal of Nuclear Materials, 166, p.278 - 286, 1989/00

 Times Cited Count:3 Percentile:56.93

no abstracts in English

JAEA Reports

Carburization Behaviour of High Temperature Aalloys in Carburizing Environment

Shindo, Masami

JAERI-M 86-053, 23 Pages, 1986/03

JAERI-M-86-053.pdf:0.94MB

no abstracts in English

Journal Articles

Corrosion behaviour of high temperature alloys in impure helium environments

Shindo, Masami; W.J.Quadakkers*; H.Schuster*

J.Nucl.Mater., 140, p.94 - 105, 1986/00

 Times Cited Count:14 Percentile:18.08

no abstracts in English

JAEA Reports

JAEA Reports

Influence of Mn Content on Corrosion Behavior Ni-Cr-W Alloys in Simulated VHTR Helium Environment

Shindo, Masami; Kondo, Tatsuo

JAERI-M 83-118, 18 Pages, 1983/07

JAERI-M-83-118.pdf:0.78MB

no abstracts in English

JAEA Reports

Effect of Temperature on Corrosion of Hastelloy XR Exposed to Simulated VHTR Environments

Shindo, Masami; ; ; Kondo, Tatsuo

JAERI-M 83-107, 20 Pages, 1983/07

JAERI-M-83-107.pdf:0.9MB

no abstracts in English

JAEA Reports

On the Estimation of Long Term Creep Rupture Strength of Hastelloy XR in HTGR Helium Environment

*; Ogawa, Yutaka; ; Kondo, Tatsuo

JAERI-M 82-032, 16 Pages, 1982/04

JAERI-M-82-032.pdf:0.97MB

no abstracts in English

JAEA Reports

Effect of Mechanical Surface Treatment on Oxidation and Carburization of some Austenitic Heat Resisting Alloys in the Simulated HTGR Helium Environment

Tamura, Manabu*; Kondo, Tatsuo

JAERI-M 9948, 27 Pages, 1982/02

JAERI-M-9948.pdf:1.49MB

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 1000$$^{circ}$$C 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 $$^{circ}$$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 1000$$^{circ}$$C. 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.

Journal Articles

JAEA Reports

JAEA Reports

JAEA Reports

The Strategy for Development of Advanced Fuel for LMFBR

JAERI-M 6851, 59 Pages, 1976/12

JAERI-M-6851.pdf:2.05MB

no abstracts in English

JAEA Reports

Compatibility of Heat Resistant Materials for HTGR,I; Adhesion Test

; ;

JAERI-M 6088, 22 Pages, 1975/03

JAERI-M-6088.pdf:1.63MB

no abstracts in English

22 (Records 1-20 displayed on this page)