1987 Fiscal Year Final Research Report Summary
Synthesis and Assement of Immofilization-Rock for Simulated HLLW
| Project/Area Number |
60880025
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear engineering
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| Research Institution | Okayama University |
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Principal Investigator |
TETSUO YOSHIO School of Engineering, Okayama Univeristy, Associate Prof., 工学部, 助教授 (70032943)
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| Co-Investigator(Kenkyū-buntansha) |
寺井 良平 大阪工業技術試験所, カ゛ラス・セラミック材料部, 研究室長
KIICHI ODA School of Engineering,Okayama University, Research Assistant, 工学部, 助手 (50033410)
RYOHEI TETAI Government Industriacl Research Institute, oSaka Manager, Glass and Ceramics Gro
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| Project Period (FY) |
1985 – 1987
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| Keywords | SYNROC rechnology / HLLW / Simulated waste / Pressureless-sintering / Immobilization / Leach-testing / Borosilicate glass / 水熱腐食 |
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| Research Abstract |
SYNROC technology has been inversitgated as an alternative method for borosilicate glass to immobilize HLLW (high level radioactive liquid waster). We payed particular attertion to rhe following resewarch subjects;1) Synthesizing waste forms immobilizing high-alkali containing waste in Japan (simulated waste were used), 2) applying the pressureless-sintering metrhod to synthesize the waste forms in order to develop conventional and financial process. In addition, the leaching characteristics of SYNROC were compared with that of borosilicate glass. Optimum preparation conditions were derermined ad follows; firing rermperatures were 1200, 1170 and 1130 C for waste loading 10,20 and 30 wt%, respectively, in Ar and H_2 mixed gas. The waste-form specimens were characterized by X-ray diffraction analysis and SEM. and their stability assessed by leach-testing. The waste-form specimens have desitable characteristice,i.e., fairly high density ( 3.8 g/cm^3), high waste loading ( 30 wt%), and leach resistance. Component leach rate in SYNROC specimens except for alkali component, Cs_2O and Na_2O, showed significantly low value compared to that of borosilicate glass. However, alkali-component leach rate in SYNROC showed nearly the same value for similat waste-loading borosilicate glass. SEM observation revealed that the leaching from SYNROC were mainly originated from depostted alkali in grain boundary. This finding suggests that improving the grain boundary of SYNROC should result in a further improved waste-form procuct.
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