• 제목/요약/키워드: Aerosol analysis

검색결과 444건 처리시간 0.03초

DEVELOPMENT AND VALIDATION OF THE AEROSOL TRANSPORT MODULE GAMMA-FP FOR EVALUATING RADIOACTIVE FISSION PRODUCT SOURCE TERMS IN A VHTR

  • Yoon, Churl;Lim, Hong Sik
    • Nuclear Engineering and Technology
    • /
    • 제46권6호
    • /
    • pp.825-836
    • /
    • 2014
  • Predicting radioactive fission product (FP) behaviors in the reactor coolant system and the containment of a nuclear power plant (NPP) is one of the major concerns in the field of reactor safety, since the amount of radioactive FP released into the environment during the postulated accident sequences is one of the major regulatory issues. Radioactive FPs circulating in the primary coolant loop and released into the containment are basically in the form of gas or aerosol. In this study, a multi-component and multi-sectional analysis module for aerosol fission products has been developed based on the MAEROS model [1,2], and the aerosol transport model has been developed and verified against an analytic solution. The deposition of aerosol FPs to the surrounding structural surfaces is modeled with recent research achievements. The developed aerosol analysis model has been successfully validated against the STORM SR-11 experimental data [3], which is International Standard Problem No. 40. Future studies include the development of the resuspension, growth, and chemical reaction models of aerosol fission products.

PIXE 분석법을 이용한 대기분진 중 함유원소 분석 (PIXE Analysis for Elemental Analysis in Aerosol)

  • 김덕경;최한우;우형주;김영석;홍완;김낙배;이진홍
    • 한국대기환경학회지
    • /
    • 제10권2호
    • /
    • pp.90-97
    • /
    • 1994
  • PIXE( Proton Induced X- ray Emission ) analysis has been applied to the analysis of aerosol for the Purpose of pollution monitoring. Coarse and fine Particle fractions were sampled selectively, using Nuclepore filter in stacked filter units, once a month from February to September in 1993 at urban and rural sites. Concentration of 9 elements, Si, S, K, Ca, Mn, Fe, Cu, Zn and Pb was determined without Pretreatment of Samples. Comparison of data between urban and rural site revealed higher elemental concentration level in urban aerosol. From April to May aerosol sampling was carried out daily to observe the effect of Yellow Sand on the composition of aerosol in the Korean Peninsula. During the Yellow Sand period, Si, Ca, Fe content level in aerosol became more than 5 times higher than normal. The elemental concentration of the aerosol samples of Daejeon City was compared with that of two foreign cities. S and Pb( which are fuel- derived elements) levels in Daejeon City aerosol appeared to be lower than those of foreign cities. And it may be due to the leaded-fuel restriction policy of Korean government since 1987.

  • PDF

Validation of the correlation-based aerosol model in the ISFRA sodium-cooled fast reactor safety analysis code

  • Yoon, Churl;Kim, Sung Il;Lee, Sung Jin;Kang, Seok Hun;Paik, Chan Y.
    • Nuclear Engineering and Technology
    • /
    • 제53권12호
    • /
    • pp.3966-3978
    • /
    • 2021
  • ISFRA (Integrated SFR Analysis Program for PSA) computer program has been developed for simulating the response of the PGSFR pool design with metal fuel during a severe accident. This paper describes validation of the ISFRA aerosol model against the Aerosol Behavior Code Validation and Evaluation (ABCOVE) experiments undertaken in 1980s for radionuclide transport within a SFR containment. ABCOVE AB5, AB6, and AB7 tests are simulated using the ISFRA aerosol model and the results are compared against the measured data as well as with the simulation results of the MELCOR severe accident code. It is revealed that the ISFRA prediction of single-component aerosols inside a vessel (AB5) is in good agreement with the experimental data as well as with the results of the aerosol model in MELCOR. Moreover, the ISFRA aerosol model can predict the "washout" phenomenon due to the interaction between two aerosol species (AB6) and two-component aerosols without strong mutual interference (AB7). Based on the theory review of the aerosol correlation technique, it is concluded that the ISFRA aerosol model can provide fast, stable calculations with reasonable accuracy for most of the cases unless the aerosol size distribution is strongly deformed from log-normal distribution.

연삭가공에서 절삭유 에어로졸 측정평가에 관한 연구 (A Study on the Analysis of Cutting Fluid Aerosol in Grinding Process)

  • 황준;황덕철;우창기;정의식
    • 한국공작기계학회논문집
    • /
    • 제14권5호
    • /
    • pp.1-6
    • /
    • 2005
  • Machining is a one of the broadly used manufacturing process to produce the parts, products and various molds and dies. The environmental impact due to aerosol generation via atomization process is a major concern associated with environmental consciousness. This paper presents the experimental results to analyze the characteristics of cutting fluid aerosol generation in grinding process. Experimental results show that the generated fine aerosol which particle size less than 10micron appears near worker's breath zone under given operational conditions. The aerosol concentration is much higher enough to affect human health risk with its generated aerosol quantities. This quantitative analysis can be provided the basic knowledge f3r further research for environmentally conscious machining technology developments.

연삭가공에서 절삭유 에어로졸 측정평가에 관한 연구 (A Study on the Analysis of Cutting Fluid Aerosol in Grinding Process)

  • 황준;황덕철;우창기;정의식
    • 한국공작기계학회:학술대회논문집
    • /
    • 한국공작기계학회 2005년도 춘계학술대회 논문집
    • /
    • pp.282-287
    • /
    • 2005
  • This paper presents the experimental results to analyze the characteristics of cutting fluid aerosol generation in grinding process. Machining is a one of the broad manufacturing process to produce the parts, products and various molds and dies. The environmental impact due to aerosol generation via atomization process is a major concern associated with environmental consciousness. Experimental results show that the generated fine aerosol which particle size less than 10 micron appears near worker's breath zone under given operational conditions. The aerosol concentration is much higher enough to affect human health risk with its generated aerosol quantities. This qualitative analysis can be provided the basic knowledge for further research for environmentally conscious machining technology developments.

  • PDF

시간대별 관측에 기초한 황사기간 중 분진의 분포특성연구 도출 (Aerosol distribution characteristics of the Asian Dust on the basis of the concurrent analysis of different PM fractions at hourly intervals)

  • 김민영;신재영;최규훈;강창희;김기현
    • 한국대기환경학회:학술대회논문집
    • /
    • 한국대기환경학회 2002년도 춘계학술대회 논문집
    • /
    • pp.259-260
    • /
    • 2002
  • 한, 중, 일을 위시한 동아시아 권역을 주무대로 aerosol의 순환, aerosol의 배출 및 침적규모, aerosol이 대기환경 또는 기후환경에 미치는 영향 등을 위시하여 aerosol과 지구환경의 관계를 체계적으로 규명하기 위한 여러 가지 연구가 Aerosol Characterization Experiment in ASIA (이하 ACE-ASIA)라는 연구사업으로 부각되었다. 본 연구사업은 국내에서 대기환경을 연구하는 다수의 과학자들뿐만이 아니라 범 아시아적 규모의 연구진, 미주 및 유럽지역을 위시한 국제적 규모의 연구진도 동시에 참여하는 형태로 자리잡게 되었다. (중략)

  • PDF

MODIS 위성 자료를 이용한 동아시아 에어로졸-구름의 통계적 특성 (Investigating Statistical Characteristics of Aerosol-Cloud Interactions over East Asia retrieved from MODIS Satellite Data)

  • 정운선;성현민;이동인;차주완;장기호;이철규
    • 한국환경과학회지
    • /
    • 제29권11호
    • /
    • pp.1065-1078
    • /
    • 2020
  • The statistical characteristics of aerosol-cloud interactions over East Asia were investigated using Moderate Resolution Imaging Spectroradiometer satellite data. The long-term relationship between various aerosol and cloud parameters was estimated using correlation analysis, principle component analysis, and Aerosol Indirect Effect (AIE) estimation. In correlation analysis, Aerosol Optical Depth (AOD) was positively Correlated with Cloud Condensation Nuclei (CCN) and Cloud Fraction (CF), but negatively correlated with Cloud Top Temperature (CTT) and Cloud Top Pressure (CTP). Fine Mode Fraction (FMF) and CCN were positively correlated over the ocean because of sea spray. In principle component analysis, AOD and FMF were influenced by water vapor. In particular, AOD was positively influenced by CF, and negatively by CTT and CTP over the ocean. In AIE estimation, the AIE value in each cloud layer and type was mostly negative (Twomey effect) but sometimes positive (anti-Twomey effect). This is related to regional, environmental, seasonal, and meteorological effects. Rigorous and extensive studies on aerosol-cloud interactions over East Asia should be conducted via micro- and macro-scale investigations, to determine chemical characteristics using various meteorological instruments.

도심 내 버스정류장 부근의 에어로졸 입자 크기 및 형상 관찰 (A Study on the Shapes of Aerosol Particles at a Bus Stop in the Eastern Part of Seoul)

  • 정상빈;허기준;신창훈;조원경;이병욱
    • 한국입자에어로졸학회지
    • /
    • 제12권4호
    • /
    • pp.109-114
    • /
    • 2016
  • People in metropolitan cities can be exposed to particulate air pollutants at public transportation systems such as bus stops. In this study, we sampled aerosol particles with an impactor at a bus stop. We analyzed the shapes of these particles with an optical microscope. It was estimated that fibers, silicons, byproducts of combustion, and pollens existed in the air environments at the bus stop with analysis of shapes of sampled particles.

Dual-PDA를 이용한 절삭유 에어로졸 특성분석에 관한 연구(II) - 선삭공정의 절삭유 에어로졸 예측 (A Study on the Characteristics Analysis of Cutting Fluid Aerosol Using Dual-PDA System(II) - for Cutting Fluid Aerosol Prediction in Turning Process)

  • 정의식;황덕철;우창기;황준
    • 한국분무공학회지
    • /
    • 제10권2호
    • /
    • pp.32-40
    • /
    • 2005
  • This paper presents the analytical approaches to predict cutting fluid aerosol formation characteristics in machining process. The prediction model which is based on the rotary atomization theory analyzes aerosol behaviors in terms of size and concentration. Experiments were tarried out to verify the aerosol formation prediction model under various operational conditions. The experimental results which are obtained by Dual-PDA measurement show resonable agreement with prediction results of aerosol concentration. This study can be provided as a basis to estimate and control the hazardous cutting fluid aerosol in machining process in view of environmental consciousness.

  • PDF

Low-Z Particle Electron Probe X-ray Microanalysis를 이용한 2001년 서울시 대기 중 입자상 물질 분석 (Single Particle Analysis of Atmospheric Aerosol Particles Collected in Seoul, 2001, Using Low-Z Particle Electron Probe X-ray Microanalysis)

  • 구희준;김혜경;노철언
    • 한국대기환경학회지
    • /
    • 제20권6호
    • /
    • pp.823-832
    • /
    • 2004
  • Atmospheric aerosol particles collected in Seoul on four single days, each in every seasons of 2001, were characterized and classified on the basis of their chemical species using low-Z particle electron probe X-ray microanalysis (low-Z particle EPMA). Low-Z particle EPMA technique can analyze both the size and the chemical species of individual aerosol particles of micrometer size and provide detailed information on the size distribution of each chemical species. The major chemical species observed in Seoul aerosol were aluminosilicate, silicon dioxide, calcium carbonate, organic, carbon-rich, marine originated, and ammonium sulfate particles, etc. The soil originated species, such as aluminosilicate, silicon dioxide, and calcium carbonate were the most popular in the coarse fraction, meanwhile, carbonaceous and ammonium sulfate were the dominant species found in the fine fraction. Marine originated species such as sodium nitrate was frequently encountered, up to 30% of the analyzed aerosol particles.