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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제38권 제1호
발행연도
2006.1
수록면
99 - 108 (10page)

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SNU-RCCS is a water pool type RCCS (Reactor Cavity Cooling System) developed for VHTR (Very High TemperatureReactor) application by SNU (Seoul National University). Since radiation heat transfer is the major process of passive heatremoval in a RCCS, it is important to determine the precise emissivity of the reactor vessel. Review studies have used a constantemissivity in the passive heat removal analysis, even though the emissivity depends on many factors such as temperature, surfaceroughness, oxidation level, wavelength, direction, atmosphere conditions, etc. Therefore, information on the emissivity of agiven material in a real RCCS is essential in order to properly analyze the radiation heat transfer in a VHTR. The objectives of this study are to develop a method for compensation of the factors affecting the emissivity measurementusing an infrared thermometer and to estimate the true emissivity from the measured emissivity via the developed method,especially in the SNU-RCCS environment. From this viewpoint, we investigated factors such as the attenuation effect of thewindow, filling gas, and the effect of background radiation on the emissivity measurements. The emissivity of the vessel surfaceof the SNU-RCCS facility was then measured using a sight tube. The background radiation was subsequently removed fromthe measured emissivity by solving a simultaneous equation. Finally, the calculated emissivity was compared with the measuredemissivity in a separate emissivity measurement device, yielding good agreement with the emissivity increase with vesseltemperature in a range of 0.82 to 0.88.

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