초록 ▼

1. 연구개발 목표 및 내용
o 원전 주변 방사능 오염 및 축적경향 종합평가 기술 확보
- 단위 모듈별 코드 확립
- 삼중수소 환경 방사능 농도 예측 모델 확립
- 종합평가 코드 구축 및 입력변수 확립
2. 연구결과
o 삼중수소 건/습침적 계산용 컴퓨터 프로그램 (DEPOS) 개발
o 동적 격실 모델 입력변수의 전달계수 생성용 프로그램 개발
o 발전소 주변 환경의 전달계수 도출물 위한 해석 프로그램 구출
o 국내 환경 중 삼중수소 농도 예측의 위

1. 연구개발 목표 및 내용
o 원전 주변 방사능 오염 및 축적경향 종합평가 기술 확보
- 단위 모듈별 코드 확립
- 삼중수소 환경 방사능 농도 예측 모델 확립
- 종합평가 코드 구축 및 입력변수 확립
2. 연구결과
o 삼중수소 건/습침적 계산용 컴퓨터 프로그램 (DEPOS) 개발
o 동적 격실 모델 입력변수의 전달계수 생성용 프로그램 개발
o 발전소 주변 환경의 전달계수 도출물 위한 해석 프로그램 구출
o 국내 환경 중 삼중수소 농도 예측의 위한 최적의 모델 선정
o 월성 발전소 주변을 대상으로 개발된 종합평가 체계에 대한 검증
3. 기대효과 및 활용바안
o 고리 3,4호기 및 영광 1,2호기 등 주기적 안전성 평가에 활용 예정
o 원전주변 방사성물질 축적경향 평가 종합모드 체계는 발전소 방출 핵종들의 축적경향 계산에 직접 활용 예정

Abstract ▼

1. Development of unit models
The task was performed with five items required in the RFP of the project to develop the unit models. The five work scope include he followings. The tritium concentration in the atmosphere was obtained. A computer program to calcu;ate the atmospheric tritium concen

1. Development of unit models
The task was performed with five items required in the RFP of the project to develop the unit models. The five work scope include he followings. The tritium concentration in the atmosphere was obtained. A computer program to calcu;ate the atmospheric tritium concentration around the Kori and Wolsong nuclear power plants was developed. The computer program was developed to compute the deposition of tritium. The dry and wet deposition models were reviewed and programmed in the program. The computer program, Visual HELP was used to prefict the precipitation and evaporation rate around the nuclear pwer plants. The groundwater flow model was set up to model the tritium behavior inthe environment. A lot of transfer coefficients were needed to get solution using a dynamic compartment model. A computer programm was developed using Visual FORTRAN program.
2. Development of a model for background concentration
We reviewed the reports issued by KINS and KHNP to get information on the tritium concentration in the environmental samples. Espocially, the change of natural background tritium concentration of the whole country was our mai interest.
The global tritium cycling model menioned in the UNSCEAR report was reviwed. We programmed three different models. NCRP world model, NCRP northern hemisphere model, and Killough and Kocher model to calculate the natural background concentration. The best model was selected compact with the measurement data.
3. Development and validation of an assessment tool
The literature survey n the Monte Carlo method was conducted to help understand the uncertainty analysis. The statistical method for the result of undertainty analysis was reviewed. The preliminary calculation using the AMBER computer program with a dynamic compartment model that was developed for simulate the tritium behavior around the nuclear power plants was conducted. We comparedthe importance of the probability distribution functions with the program.
We collected and analyzed the past records of tritium concentration at the Wolsong site to validate the dynamic compartment model developed in this study. The new samples of surface water and groundwater were taken and measured to compare with the past records. The atmospheric tritium concentration was calculated with the model developed in this study and compared with the measurement data. The wet deposition by the precipitation was calculated with the washout ratio approach, and the results were compared with the measurement. The source term was derived using the dry and wet deposition calculation.
The hydrological model for Wolsog site set up usig a digital map. Goundwater flow for the model was analyzed with the computer program, FEMWATER. The transfer coeddicients for the evaporation and runoff were obtained using a Visual HELP program.
A numerical solution of the dynamic compartment model developed in this study was obtained for Kigury-town using the source term and the transfer coefficients. The solution including the natural background concerntration was conducted for the dynamic compartment model to enhance the confidence of the results.
A region of interest was selected from three dimensional geography of the site generated using a digital map. The transfer coefficients including groundwater flow were derived with unit models. We showed how to derive the transfer coefficientsneeded for the dynamic compartment model using an example.

목차 Contents

• 제1장 서론 ... 38
• 제2장 국내.외 기술개발 현황 ... 44
• 제3장 연구개발수행 내용 및 결과 ... 48
• 제1절 단위 모듈별 코드 확립 ... 48
• 1. 침적량 계산 프로그램 개발 ... 48
• 2. 발전소 주변 강수량 및 증발량 예측 ... 62
• 3. 지하수 해석 모델 ... 68
• 4. 전달계수 도출 프로그램 개발 ... 75
• 5. 환경 중 삼중수소 거동 해석 ... 82
• 제2절 삼중수소 환경 방사능 농도 예측 ... 93
• 1. 고리 주변 삼중수소 농동 변화 추이 ... 93
• 2. 삼중수소 지구순환 모델 ... 95
• 3. 삼중수소 선원항 및 계산 결과 ... 98
• 제3절 종합 평가 코드 구축 및 입력변수 확인 ... 123
• 1. 불확실성 평가 체계 구축 ... 123
• 2. 원성 발전소 주변 환경 모델링 ... 140
• 3. 입력변수 확보 방안 ... 174
• 제4장 연구개발 목표 달성도 및 대외 기여도 ... 177
• 제5장 연구개발결과의 활용계획 ... 179
• 제6장 연구개발과정에서 수집한 해외 과학기술정보 ... 180