고온가스로용 핵연료 제조에서 열처리 조건이 우라늄산화물 입자 특성에 미치는 영향
Effects of Thermal Treatment Conditions on the Powder Characteristics of Uranium Oxide in HTGR Fuel Preparation
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The effects of thermal treatment conditions on ADU (ammonium diuranate) prepared by SOL-GEL method, so-called GSP (Gel supported precipitation) process, were investigated for UO2 kernel preparation. In this study, ADU compound particles were calcined to UO3 particles in air and Ar atmospheres, and these UO3 particles were reduced and sintered in 4%-H2/Ar. During the thermal calcining treatment in air, ADU compound was slightly decomposed, and then converted to UO3 phases at 500℃. At 600℃, the U3O8 phase appeared together with UO3. After sintering of theses particles, the uranium oxide phases were reduced to a stoichiometric UO2. As a result of the calcining treatment in Ar, more reduced-form of uranium oxide was observed than that treated in air atmosphere by XRD analysis. The final phases of these particles were estimated as a mixture of U3O7 and U4O9.
Abstract
The effects of thermal treatment conditions on ADU (ammonium diuranate) prepared by SOL-GEL method, so-called GSP (Gel supported precipitation) process, were investigated for UO2 kernel preparation. In this study, ADU compound particles were calcined to UO3 particles in air and Ar atmospheres, and these UO3 particles were reduced and sintered in 4%-H2/Ar. During the thermal calcining treatment in air, ADU compound was slightly decomposed, and then converted to UO3 phases at 500℃. At 600℃, the U3O8 phase appeared together with UO3. After sintering of theses particles, the uranium oxide phases were reduced to a stoichiometric UO2. As a result of the calcining treatment in Ar, more reduced-form of uranium oxide was observed than that treated in air atmosphere by XRD analysis. The final phases of these particles were estimated as a mixture of U3O7 and U4O9.
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