UO2 Pellet의 대용량 산화장치 설계개선에 관한연구

다국어 초록 (Multilingual Abstract)

This study propose a improved design for vol-oxidizer which is united two process into one.
This vol-oxidation device is combined type of the vol-oxidation and the decladding process. The device should have radiation-resistance to operate in intense radiation area, and should proceed the overall process quickly.
Above all we analyzed mechanical properties(slitting, ball mill, roller straightening) and chemical properties(muffle furnace, rotary kiln) of the device. As a analysis step, ball drop method, rotary type mesh, vibrators, mixing blades were selected. Also, the vacuum system is adopted for fission products.
Property analysis is made by using reactor which consist with rotary mesh. Simulating experiment with the device include powder recovery rate, oxidation time, temperature control of exothermic, scattering of powder and so on. To find the heat transfer characteristics, the experiment used the simulated fuel, and the heat loss appeared according to an interval of reactor and heating line is analysed. To examine the condition of the oxidized powder, the dry and wet particle analyse carried out.
The experimental results showed that the mesh permeability and collection rate of simulated powder improved than old vol-oxidation device, and because of the vol-oxidation is all in one structure the work time and the process is reduced. The oxidation and recovery mechanisms of cut fuel rod in this device carry out simultaneously, and the hull and powder could independently recovered.

목차 (Table of Contents)

• 1. 서론 1
• 1.1 연구배경 1
• 1.2 연구 동향 및 목적 3
• 1.2.1 국내기술개발현황 3
• 1.2.2 국외 기술개발현황 7
• 2. 이론적 배경 13
• 2.1 차세대관리 공정기술(ACPF) 13
• 2.2 탈피복(Slitting)공정기술 15
• 2.3 분말화 공정기술 17
• 2.4 UO₂ 소결체의 산화/환원의 특성 18
• 2.5 조사선량(Exposure Dose) 18
• 2.6 방사선의 영향 19
• 2.6.1 방사선이 금속에 미치는 영향 19
• 2.6.2 방사선이 세라믹에 미치는 영향 21
• 2.6.3 방사선이 윤활제에 미치는 영향 21
• 3. 실험장치 및 방법 25
• 3.1 대용량 산화장치 25
• 3.1.1 일체형 장치 25
• 3.1.2 최대 산화속도, 산화속도, 산화요건 27
• 3.1.3 메시형 반응기의 외부 블레이드에 의한 산화속도 증대 27
• 3.1.4 핵분열성 가스포집/회수 시스템 29
• 3.1.5 연료 산화와 피복관/분말회수 메커니즘 설계 31
• 3.1.6 반응부와 히터의 간격 고정변수에 따른 외기 공급온도 결정 31
• 3.2 구성장치 32
• 3.2.1 O2분석기(Zirox) 32
• 3.2.2 유량조절기(MFC) 33
• 3.2.3 온도제어기 34
• 3.3 실험재료 35
• 3.3.1 모의분말산화 35
• 3.3.2 모의펠릿제조 37
• 3.3.3 모의연료제조 39
• 4. 실험결과 및 고찰 40
• 4.1 길이에 따른 모의연료 산화 40
• 4.2 산소농도에 따르는 모의연료의 산화시간 43
• 5. 결론 49
• References 51
• ABSTRACT 54