지하처분장에서의 고준위폐기물 처분공정 개념

이종열(J. Y. Lee),김성기(S. K. Kim),조동건(D. K. Cho),최희주(H. J. Choi),최종원(J. W. Choi) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월

High level radioactive wastes, such as spent fuels generated from nuclear power plant, will be disposed in a deep geological repository. To maintain the integrity of the disposal canister and to carry out the process effectively, the emplacement process for the canister system in borehole of disposal tunnel should be well defined. In this study, the concept of the disposal canister emplacement process for deep geological disposal was established. To do this, the spent fuel arisings and disposal rate were reviewed. Also, not only design requirements, such canister and disposal depth but also preliminary repository layout concept were reviewed. Based on the requirements and the other bases, the canister emplacement process in the borehole of the disposal tunnel was established. The established concept of the disposal canister emplacement process will be improved continuously with the future studies. And this concept can be effectively used in implementing the reference repository system of our own case.

심지층 처분을 위한 사용후핵연료 포장공정 장비개념 설정

이종열(J. Y. Le),최희주(H. J. Choi),조동건(D. K. Cho),김성기(S. K. Kim),최종원(J. W. Choi),한필수(P. S. Hahn) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월

Spent nuclear fuels are regarded as a high level radioactive waste and they will be disposed in a deep geological repository. To maintain the safety of the repository for hundreds of thousands of years, the spent fuels are encapsulated in a disposal canister and the canister containing spent fuels should have the structural integrity and the corrosion resistance below the several hundreds meters from the ground surface. In this study, the concept of the spent fuel encapsulation process and the process equipment for deep geological disposal were established. To do this, the design requirements, such as the functions and the spent fuel accumulations, were reviewed. Also, the design principles and the bases were established. Based on the requirements and the bases, the encapsulation process and the equipment from spent fuel receiving process to transferring canister into the underground repository including hot cell processes was established. The established concept of the spent fuel encapsulation process and the process equipment will be improved continuously with the future studies. And this concept can be effectively used in implementing the reference repository system of our own case.

ArcView를 이용한 고리 원전 주변 육상생태계 평가를 위한 GIS 구축

강희석,최희주,유동한,금동권,최용호,임광묵,이한수,이창우,Kang, H.S.,Choi, H.J.,Yu, D.H.,Keum, D.K.,Choi, Y.H.,Lim, K.M.,Lee, H.S.,Lee, C.W. 대한방사선방어학회 2005 방사선방어학회지 Vol.30 No.3

고리 원전 주변 지역에서 가상사고 시에 발생하는 핵종 방출 후 토양 또는 농작물에서 시간 경과에 따라 변화하는 핵종 농도분포를 도식적으로 표현하기 위한 GIS를 구축하였다. 이를 위해 ESRI 사의 GIS 구축용 상용 프로그램인 ArcView를 도입하였다. 미리 고리원전 주변의 북서방향 $20km{\times}20km$ 구역에 대한 1:5000 축적의 지도 데이터를 구축하였다. 표현 대상 농작물 및 방출핵종은 주민의 주식인 쌀과 $^{131}I$로 정하였다. 총 100개의 cell에서 $^{131}I$의 침적량으로부터 토양 및 농작물 부분에 대한 $^{131}I$의 시간에 따른 양을 ECOREA-II코드를 통해 계산하였다. 계산결과를 ArcView에서 미리 준비된 polygon cell의 속성 자료에 각각의 cell id와 일치시켜 데이터 병합(join) 작업을 수행하였다. 시간이 경과됨에 따라 낮아지는 $^{131}I$ 농도값을 일관성있는 색상 변화로 나타내기 위해 ArcView의 color lamp에 대한 RGB 값을 조절하였다. 이 방법을 이용하여 고리주변의 북서방향 $10km{\times}10km$ 지역에서 $^{131}I$의 침적 후 쌀에서 시간에 따라 변하는 $^{131}I$ 농도분포를 일관성있는 색상 변화로 쉽게 구분이 되도록 나타낼 수 있었다. Geographical Information System(GIS) was established to display the calculation results which show the concentration change with time and regions in case of an accidental release of radionuclides from Kori Nuclear Power Plants. GIS included the commercial program, ArcView(ESRI), and a basic digital map of 1:5000 scale lot 20km by 20km around Kori area. The object for the presentation was $^{131}I$ concentration in rice which is one of staple foodstuffs. Provided by deposited $^{131}I$ concentrations, ECOREA-II code computed the $^{131}I$ concentration of the soil and the plant in the area divided by In unit cells in total, in which the concentrations also varied with time. The results were introduced into the attributed data of previously designed polygon cells in ArcView. In order to display the concentration change with time by monotonic color, the RGB value for ArcView color lamp was controlled. This display definitely helped the concentration change around Kori area be acceptable to public.

벼에 대한 원소상 요오드 증기$(I_2)$의 직접오염경로 해석 실험

최용호,임광묵,이창민,박효국,박두원,최근식,최희주,이한수,이창우,Choi, Y.H.,Lim, K.M.,Lee, C.M.,Park, H.G.,Park, D.W.,Choi, G.S.,Choi, H.J.,Lee, H.S.,Lee, C.W. 대한방사선방어학회 2004 방사선방어학회지 Vol.29 No.3

피폭상자 내에서 벼를 생육단계별로 80 분 간 $I_2$ 증기에 피폭시키고 작물체 직접오염 관련 인자를 조사하였다. $I_2$ 증기의 경엽부 침적속도$(m\;s^{-1})$는 피폭시기에 따라 $1.4{\times}10^{-5}-1.3{\times}10^{-4}$의 범위로 생육 전반기 피폭시 비교적 낮았다. 이삭 침적속도는 $2.5{\times}10^{-5}-6.7{\times}10^{-5}$의 범위였다. 전체 작물체에 대한 침적속도는 $1.4{\times}10^{-5}-1.8{\times}10^{-4}$의 범위로 8월 18일(출수 시작후 7일) 피폭시 가장 높았다. 침적속도를 생육밀도 기준으로 나타내면 시기에 따른 변이 정도가 대체로 감소하였다. 기온, 일광 및 습도에 대한 이렇다할 침적속도의 경향성은 관찰되지 않았다. 요오드의 현미 전류계수는 $3.3{\times}10^{-5}-4.7{\times}10^{-4}$의 범위로 8월 23일 피폭에서 가장 높았다. 출수전 경엽부에 침적한 요오드도 상당량 현미로 전류하는 것으로 나타났다. Rice plants were exposed to $I_2$ vapor for 80 min at different growth stages in an exposure box to investigate the parameters concerning direct plant contamination. Deposition velocity $(m\;s^{-1})$ of the $I_2$ vapor for the straws was in the range of $1.4{\times}10^{-5}-1.3{\times}10^{-4}$ depending on the exposure time, being comparatively low during the earlier part of the plant growth. Ear deposition velocity was in the range of $2.5{\times}10^{-5}-6.7{\times}10^{-5}$. Whole-plant deposition velocity was in the range of $1.4{\times}10^{-5}-1.8{\times}10^{-4}$ with the highest from the exposure performed on Aug. 18 (7 d after the start of heading). The time-dependent variation generally decreased when the deposition velocity was normalized to the biomass density No noteworthy tendency in the deposition velocity was observed with regard to the temperature, sunlight and humidity. Translocation factor for the hulled seeds was $3.3{\times}10^{-5}-4.7{\times}10^{-4}$ with the highest from the Aug. 23 exposure. It was found that a leaf deposition even before the ear emergence resulted in a considerable seed translocation.

수소동위원소 교환반응 촉매 지지체의 경도에 대한 용매의 효과

이성호,김광락,안도희,이한수,정흥석,강희석,백승우,최희주 한국공업화학회 2000 응용화학 Vol.4 No.1

Polymeric catalyst supports for hydrogen isotope exchange reaction were prepared by using the various good and poor solvents. Effect of solvent was investigated experimentally on the hardness of these polymeric supports. P55OE1 showed the highest hardness and low ratio of micro pore area to total pore area. P55TE2 showed high hardness and ratio of micro pore area to total pore area. Therefore P55TE2 was expected to be the best polymeric support with regard to the performance and the hardness of the catalyst.

비활성 알루미나 고정상을 이용한 수소동위원소 분리 특성

이성호,김광락,안도희,이한수,정흥석,손종식,최희주 한국공업화학회 2000 응용화학 Vol.4 No.1

Gas chromatography has been used as one of the practical methods for separation and enrichment of hydrogen isotopes in fields of operation or handling a hydrogen isotope facility. Chromatographic separation experiments of a mixture of hydrogen isotopes including with hydrogen(H₂), hydrogen deutride(HD) and deuterium(D₂) were carried out. The complete separation of hydrogen isotopes was observed with an alumina adsorbent partially deactivated by coating with 10% manganese chloride(Mn-Cl₂), which could be available for the practical applications of the hydrogen isotope separation and enrichment.

폐사과 껍질을 이용한 폐수중 구리 및 납이온 제거 특성

이성호,정흥석,김인태,손종식,최희주 한국공업화학회 2000 응용화학 Vol.4 No.1

Apple residues(AR) from apple-juice processing was used to remove the copper and lead ions from aqueous solution. This residues contains acidic functional groups with cation exchange properties which can be enhanced by means of chemical modification. The removal characteristics of copper and lead ions onto the original residues(AR) as well as onto phosphated apple residues(P-AR) was investigated for evaluating the cation exchange capacities. The effects of pH, co-ion, ionic strength and chemical treatment were studied.