Journal of Radiation Protection and Research
- Volume 24 Issue 2
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- Pages.73-86
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- 1999
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- 2508-1888(pISSN)
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- 2466-2461(eISSN)
A Study on Electrodeionization for Purification of Primary Coolant of a Nuclear Power Plant
원자력 발전소의 일차 냉각수 정화를 위한 전기탈이온법의 기초연구
- Yeon, Kyeong-Ho (Department of Environmental Science and Engineering & Environmental Research Center) ;
- Moon, Seung-Hyeon (Department of Environmental Science and Engineering & Environmental Research Center) ;
- Jeong, Cheorl-Young (Korea Electric Power Corporation) ;
- Seo, One-Sun (Korea Electric Power Corporation) ;
- Chong, Sung-Tai (Korea Electric Power Corporation)
- 연경호 (광주과학기술원 환경공학과 및 에너지 환경연구센터) ;
- 문승현 (광주과학기술원 환경공학과 및 에너지 환경연구센터) ;
- 정철영 (한국전력공사) ;
- 서원선 (한국전력공사) ;
- 정성태 (한국전력공사)
- Published : 1999.06.30
Abstract
The ion-exchange method for the purification of primary coolant has been used broadly in PWR(pressurized water reactor)-type nuclear power plants due to its high decontamination efficiency, simple system, and easy operation. However, its non-selective removal of metal and non-radionuclides shortens its life, resulting in the generation of a large amount of waste ion-exchange resin. In this study, the feasibility of electrodeionization (EDI) was investigated for the purification of primary cooling water using synthetic solutions under various experimental conditions as an alternative method for the ion exchange. The results shows that as the feed flow-rate increased, the removal efficiency increased and the power consumption decreased. The removal rate was observed as a 1000 decontamination factor(DF) at a nearly constant level. For the synthetic solution of 3 ppm TDS (Total Dissolved Solid), the power consumption was 40.3 mWh/L at 2.0 L/min of feed flow rate. The higher removal rate of metal species and lower power consumption were obtained with greater resin volume per diluting compartment. However, the flow rate of the EDI process decreased with the elapsed time because of the hydrodynamic resistivity of resin itself and resin fouling by suspended solids. Thus, the ion-exchange resin was replaced by an ion-conducting spacer in order to overcome the drawback. The system equipped with the ion-conducting spacer resolved the problem of the decreasing flow rate but showed a lower efficiency in terms of the power consumption, the removal rate of metal species and current efficiency. In the repeated batch operation, it was found that the removal efficiency of metal species was stably maintained at DF 1000.
현재 경수로형 원자력발전소의 일차계통 냉각수 정화를 위해 사용되는 이온교환방법은 제염효과가 우수하고 공정이 단순하며 조작이 간편하기 때문에 광범위하게 활용되고 있으나 비금속성분도 함께 제거하여 수지의 수명이 단축되고 폐이온교환수지가 발생되는 단점이 있다. 본 연구에서는 일차계통 냉각수 정화를 위해 사용되는 이온교환수지의 대체공정으로서 전기투석과 이온교환이 결합된 전기탈이온법의 사용가능성을 조사하기 위해 모의 용액을 이용하여 다양한 실험조건하에서 수행하였다. 실험결과 유입유량이 증가할수록 제거율은 증가하고 전력소모는 감소하였다. 금속성분 제거율에서 제염계수 1000으로 일정한 경향을 나타내었으며 전력소모 면에서는 TDS 3 ppm이하를 기준으로 유입유량이
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