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http://dx.doi.org/10.7733/jnfcwt.2018.16.2.183

Characterization of Cement Solidification for Enhancement of Cesium Leaching Resistance  

Kim, Gi Yong (Korea Atomic Energy Research Institute)
Jang, Won-Hyuk (Korea Atomic Energy Research Institute)
Jang, Sung-Chan (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
Im, Junhyuck (Korea Atomic Energy Research Institute)
Hong, Dae Seok (Korea Atomic Energy Research Institute)
Seo, Chel Gyo (Korea Atomic Energy Research Institute)
Shon, Jong Sik (Korea Atomic Energy Research Institute)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.16, no.2, 2018 , pp. 183-193 More about this Journal
Abstract
Currently, the Korea Atomic Energy Research Institute (KAERI) is planning to build the Ki-Jang Research Reactor (KJRR) in Ki-Jang, Busan. It is important to safely dispose of low-level radioactive waste from the operation of the reactor. The most efficient way to treat radioactive waste is cement solidification. For a radioactive waste disposal facility, cement solidification is performed based on specific waste acceptance criteria such as compressive strength, free-standing water, immersion and leaching tests. Above all, the leaching test is important to final disposal. The leakage of radioactive waste such as $^{137}Cs$ causes not only regional problems but also serious global ones. The cement solidification method is simple, and cheaper than other solidification methods, but has a lower leaching resistance. Thus, this study was focused on the development of cement solidification for an enhancement of cesium leaching resistance. We used Zeolite and Loess to improve the cesium leaching resistance of KJRR cement solidification containing simulated KJRR liquid waste. Based on an SEM-EDS spectrum analysis, we confirmed that Zeolite and Loess successfully isolated KJRR cement solidification. A leaching test was carried out according to the ANS 16.1 test method. The ANS 16.1 test is performed to analyze cesium ion concentration in leachate of KJRR cement for 90 days. Thus, a leaching test was carried out using simulated KJRR liquid waste containing $3000mg{\cdot}L^{-1}$ of cesium for 90 days. KJRR cement solidification with Zeolite and Loess led to cesium leaching resistance values that were 27.90% and 21.08% higher than the control values. In addition, in several tests such as free-standing water, compressive strength, immersion, and leaching tests, all KJRR cement solidification met the waste acceptance or satisfied the waste acceptance criteria for final disposal.
Keywords
Ki-Jang Research Reactor; KJRR; Cement solidification; Acceptance criteria. Zeolite; Loess;
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Times Cited By KSCI : 1  (Citation Analysis)
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