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Usui, Takahiro*; Sawada, Akihiko; Amaya, Masaki; Suzuki, Akihiro*; Chikada, Takumi*; Terai, Takayuki*
Journal of Nuclear Science and Technology, 52(10), p.1318 - 1322, 2015/10
Times Cited Count：62 Percentile：97.40(Nuclear Science & Technology)SiC coating is one of countermeasures for the prevention of oxidation and hydrogen embrittlement of fuel claddings because SiC has high resistance of oxidation and hydrogen permeation. Hydrogen permeation and oxidation experiments for the cladding materials with SiC coatings were conducted in unirradiated conditions. The sputtering method was employed to make SiC coatings. In the hydrogen permeation experiment, SUS316 was used as a base material of the coating. SUS316 with SiC coatings showed hydrogen permeation reduction by one order of magnitude. In the oxidation experiments, Zry-4 and SUS316 were used as base materials of the coatings. The weight gain of the Zry-4 specimens with a SiC coating decreased by about one-fifth compared to the uncoated ones. This phenomenon was observed for SUS316 at 750 
C as well. The peel-off of the coating was observed in some experiments, and it is considered that the peel-off was caused by the difference of the thermal expansions between coatings and base materials. Thicker coatings showed better oxidation resistance, but thinner coatings showed more tolerance of peel-off.
Takebe, Shinichi; Kimura, Hideo; Matsuzuru, Hideo; Takahashi, Tomoyuki*; Yasuda, Hiroshi*; Uchida, Shigeo*; Mahara, Yasunori*; Saeki, Akiyoshi*; Sasaki, Noriyuki*; Ashikawa, Nobuo*; et al.
JAERI-Review 2001-015, 81 Pages, 2001/05
JAERI-Review-2001-015.pdf:5.94MB
no abstracts in English
Takahashi, Tomoyuki*; Takebe, Shinichi; Kimura, Hideo; Matsuzuru, Hideo; Yasuda, Hiroshi*; Uchida, Shigeo*; Saeki, Akiyoshi*; Mahara, Yasunori*; Sasaki, Noriyuki*; Ashikawa, Nobuo*; et al.
KURRI-KR-44, p.169 - 176, 2000/02
no abstracts in English
Oda, Chie; Amaya, Takayuki*
JNC TN8400 98-001, 14 Pages, 1998/11
Solubilities of amorphous stannic oxide, SnO
(am) in Na-ClO
-Cl-SO aqueous systems were measured to quantitatively investigate the influences of the ligands OH
, Cl and SO
on solubilities. They were also measured in bentonite equilibrated solutions to discuss the behavior of tin under a repository condition of a high-revel radioactive waste. The solubility data in sodium perchlorate media in the range of pH from 6 to 11 showed pH dependency, and the hydrolysis constants of tin (IV) were determined (Amaya, et al., 1997). No significant changes in solubilities with the variation in Cl, SO concentrations were observed in Na-ClO-Cl-SO aqueous systems, so this indicates that chloride and sulfate species were less effective than hydroxide complexes. On the other hand, solubilities in bentonite equilibrated solutions were higher than solubilities of other experiments in simple systems. These results suggest that (1) other complexes of tin except hydroxide, chloride or sulfate complexes of tin (IV) may dominantly exist in aqueous phase, (2)solid phase other than SnO (am) may limit the solubility of tin under repository conditions.
Ikeda, Takao*; Amaya, Takayuki*; Chiba, Tamotsu*
PNC TJ1281 97-004, 42 Pages, 1997/03
It is very important to explain the sorption mechanisms of relevant radionuclides, for the performance assessment of geological disposal and for the technical development of engineering barrier system. In the previous studies 1993-1996, these tests were carried out to understand sorption mechanism of SN; -solubility tests -sorption tests onto bentonite, pure montmorillonite, A-FEO(OH) -extraction tests from these minerals -sorption tests onto tuff as a next step, these tests were carried out ragarding SN in this study; -diffusion tests (in-diffusion) -tests for effect of SN concentration and ionic strength on sorption -sorption tests onto granite -tests for effect of coexistent ions on solubility
Amaya, Takayuki*; Suzuki, Kazunori*; Oda, Chie; Yoshikawa, Hideki; Yui, Mikazu
Materials Research Society Symposium Proceedings, p.819 - 826, 1997/00
None
solution at ambient temperatureAmaya, Takayuki*; Suzuki, Kazunori*; Chiba, Tamotsu*; Oda, Chie; Yoshikawa, Hideki; Yui, Mikazu
Materials Research Society Symposium Proceedings, Vol.465, p.751 - 758, 1997/00
None
Usui, Takahiro; Sawada, Akihiko; Amaya, Masaki; Suzuki, Akihiro*; Terai, Takayuki*
no journal, ,
Coating on cladding material is one of the candidate as "Accident Toralent Fuel". In this study, SiC coating was fabricated on SUS316 substrate and performed oxdation experiment under LOCA condition. Oxidation of iron decreased in the specimen with coating. The specimen coated for 1 hour showed the best integrity of oxidation.
Usui, Takahiro*; Sawada, Akihiko; Amaya, Masaki; Suzuki, Akihiro*; Chikada, Takumi*; Terai, Takayuki*
no journal, ,
SiC coatings were fabricated on SUS316 and Zircaloy-4 substrate. Hydrogen permeation experiment and oxidation experiment were performed. From hydrogen permeation experiment to SiC coated specimen on SUS316 subsrate, permeability of specimen was smaller in one order in magnitude than that of uncoated. From oxidation experiment on Zircaloy-4 substrate, weight gain and thickness of oxide film decreased. Specimens with thicker coating has less weight gain than that with thinner coating, however, thicker coating was peeled off more than thinner coating after oxidized in 1200C.
Usui, Takahiro; Komiyama, Daisuke; Amaya, Masaki; Suzuki, Akihiro*; Terai, Takayuki*
no journal, ,
Oxidation experiments of the SiC coating on the Zry-4 plates were conducted. It was observed that the SiC coating on the Zry-4 specimens has oxidation resistance at 1200C for 30 min. The peel-off of the coating were observed at 1000C and more. It is possible that the peel-off of the coating was affected by the reaction between SiC coating and Zry-4 substrates.
Iwasaki, Maho; Tanaka, Kosuke; Sato, Isamu; Miwa, Shuhei; Osaka, Masahiko; Amaya, Masaki; Koyama, Shinichi; Seki, Takayuki*; Tokoro, Daishiro*; Ishigamori, Toshio*
no journal, ,
no abstracts in English
