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Furuya, Kazuyuki*; Ida, Mizuho; Miyashita, Makoto; Nakamura, Hiroo
Journal of Nuclear Materials, 386-388, p.963 - 966, 2009/04
Times Cited Count：19 Percentile：75.92(Materials Science, Multidisciplinary)The current material design of the IFMIF back wall in Japan consists of a stainless steel type-316L and F82H steel. The 316L and F82H are welded each other. The 316L region of the back wall is also welded with the target assembly made of 316L. Since the back-wall is operating under severe neutron irradiation condition (50 dpa/year), it is therefore important to perform metallurgical and mechanical tests for these welds. In result of the tests, significant issues were not found in the F82H/316L TIG-weld. On the other hand, although the 316L/316L YAG-weld offered the weld without any harmful weld defect, the hardness decreased somewhat in the fusion metal. The rupture occurred in the fusion metal, and the strength and elongation decreased somewhat. Furthermore, small dimples include several number of large voids were also seen in the fracture surface.
Ida, Mizuho; Chida, Teruo; Furuya, Kazuyuki*; Wakai, Eiichi; Nakamura, Hiroo; Sugimoto, Masayoshi
Journal of Nuclear Materials, 386-388, p.987 - 990, 2009/04
Times Cited Count：6 Percentile：40.80(Materials Science, Multidisciplinary)To clarify IFMIF target back-wall structures and materials with acceptable thermal-stress and deformation due to nuclear heating during the accelerator operation, thermal-stress analysis was done using a code ABAQUS and data of nuclear heating. Two types of back-wall were estimated. One is made of only 316L, and the other is made of 316L at its circumference and F82H a RAF steel at center. Effects of stress-mitigation structure with thickness 2-8 mm, and beam heat loads of 10-100% were estimated. As a result, thermal-stress in the latter back-wall is acceptable level less than 328 MPa for 316L and 455 MPa for F82H even under full heat load, if thickness of the stress-mitigation part is more than 5 mm. On the contrary, thermal-stress in the former is not acceptable. In preliminary tensile tests on dissimilar welding (316L-F82H) specimen, the fracture was occurred in base metal of 316L. Therefore, this welding is expected to be employed as the back-wall.
Nakai, Hisaaki*; Temma, Tsuyoshi*; Tamada, Masao; Sawamura, Toshihiro*; Saito, Takayuki*; Homma, Tetsuo*; Sato, Yasushi*
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 47, 2007/02
Removal technology for cadmium ion (Cd
) from the mid-gut gland in the scallop processing was developed by combining the Cd leaching process with malic acid solution and Cd adsorption with iminodiacetic acid adsorbent synthesized with radiation-induced graft polymerization. Experimental equipment was assembled for removal of the Cd from 20-40 kg of mid-gut gland. The Cd in the mid-gut gland was reduced from 25 mg/kg to 1 mg/kg after 24 h treatment.
Nakai, Hisaaki*; Temma, Tsuyoshi*; Tamada, Masao; Sawamura, Toshihiro*; Saito, Takayuki*; Homma, Tetsuo*; Sato, Yasushi*
no journal, ,
Waste mid-gut glands of scallop processing was incinerate as industrial wastes since they contained toxic cadmium. However, mid-gut glands is valuable sources for proteins, a fatty substance, docosahexaenoic acid (DHA), and eicosapentaenoic acid (EPA). Apparatus of cadmium removal from 20 kg mid-gut glands were assembled by combining the elution of cadmium with malic acid and the adsorption of cadmium with graft adsorbent. After the treatment of 15 kg waste mid-gut glands for 24 hours by the apparatus, the initial cadmium concentration of 25 mg/kg was reduced to 1.0 mg/kg.
Nakai, Hisaaki*; Temma, Tsuyoshi*; Tamada, Masao; Sawamura, Toshihiro*; Saito, Takayuki*; Homma, Tetsuo*; Sato, Yasushi*
no journal, ,
Removal technology for cadmium ion (Cd) from the mid-gut gland in the scallop processing was developed by combining the Cd leaching process with malic acid solution and Cdadsorption with graft adsorbent. Experimental equipment was assembled for removal of the Cd from 30 kg of mid-gut gland. The concentration of Cd in the mid-gut gland was reduced from 25 mg/kg to 1mg/kg after 24h treatment. The treated mid-gut gland can be used for fertilizer, animal food, food additives, and supplement.
Furuya, Kazuyuki*; Miyashita, Makoto; Ida, Mizuho; Wakai, Eiichi; Nakamura, Hiroo
no journal, ,
The IFMIF is an accelerator-based intense neutron source for testing candidate materials for fusion reactors. Intense neutrons are emitted inside the Li flow through a backplate. Since the backplate will be operated under a severe neutron irradiation of 50 dpa / year, application of RAF/Ms such as F82H steel is selected. In Japanese design option, F82H is welded with a lip seal made of an austenitic stainless steel type-316L, by TIG-welding. Purpose of this study is to investigate metallurgical and mechanical property of dissimilar welding joint applied for different type of welding rod (SMW82), and to select the optimum welding rod material.
Tamada, Masao
no journal, ,
Scallop mid-gut gland which contains protein and unsaturated aliphatic acid was incinerated as waste of the scallop processing since it is contaminated by 10-40 ppm cadmium. Effective removal of cadmium from the mid-gut gland was developed by combining the extraction of cadmium with malic acid and the adsorption of cadmium with adsorbent synthesized by radiation-induced graft polymerization. The apparatus for the removal of cadmium from 20kg mid-gut gland was assembled. The cadmium concentration could be reduced to 1ppm. This result implies the mid-gut gland can be utilized as feed.
Nakai, Hisaaki*; Temma, Tsuyoshi*; Tamada, Masao; Sawamura, Toshihiro*; Saito, Takayuki*; Homma, Tetsuo*; Sato, Yasushi*
no journal, ,
Waste mid-gut glands of scallop processing was incinerate as industrial wastes since they contained toxic cadmium. However, mid-gut glands is valuable sources for proteins, a fatty substance, docosahexaenoic acid (DHA), and eicosapentaenoic acid (EPA). Apparatus of cadmium removal from 20 kg mid-gut glands were assembled by combining the elution of cadmium with malic acid and the adsorption of cadmium with graft adsorbent. After the treatment of 15kg waste mid-gut glands for 24hours by the apparatus, the initial cadmium concentration of 25mg/kg was reduced to 1.0mg/kg.
