방사성폐기물학회지 (Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT))
- 제5권2호
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- Pages.145-154
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- 2007
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- 1738-1894(pISSN)
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- 2288-5471(eISSN)
벤토나이트 완충재의 열수거동 및 장기건전성 연구
Hydrothermal Behaviors and Long-term Stability of Bentonitic Buffer Material
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Lee, Jae-Owan
(Korea Atomic Energy Research Institute) ;
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Cho, Won-Jin
(Korea Atomic Energy Research Institute)
- 발행 : 2007.06.30
초록
벤토나이트 완충재의 열수거동 실험에서는 고준위폐기물처분장 완충재로 유력하게 고려되고 있는 국산 벤토나이트를 대상으로 열수특성을 규명하고, 또 그 결과를 바탕으로 KRS 처분환경에서 벤토나이트 완충재의 장기건전성을 평가하였다. 실험결과, 벤토나이트 완충재의 열수반응은 주 구성광물인 스멕타이트의 일라이트화를 통해 진행되었으며, 온도,
In hydrothermal reaction tests, smectite-to-illite conversion was identified using a domestic bentonite which is favorably considered as a buffer material, and its dependency on various hydrothermal conditions was investigated. The analysis results of the XRD and Si concentration indicated that the smectite-to-illite conversion was a major process of bentonite alteration under the hydrothermal conditions. The temperature, potassium concentration in solution, and pH were observed to significantly affect the smectite-to illite conversion. A model of conversion reaction rate was suggested to evaluate the long-term stability of smectite composing a major constituent of bentonitic buffer. It was expected from the evaluation results that the smectite would keep its integrity for very long disposal time under a normal condition, whitens it might be converted to illite by 50 percent after over