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박용철(Y. C. Park),우종섭(J. S. Wu) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The HANARO, a multi-purpose research reactor of 30 MWth, open-tank-in-poot type, has been under normal operation since its initial criticality in February, 1995. The HANARO is composed of inlet plenum, grid plate, core channel with now tubes and chimney. The reactor core channel is located at about twelve meters (12 m) depth of the reactor pool and cooled by the upward now that the coolant enters the lower Inter of the plenum, rises up through the grid plate and the core channel and comes oul from the outlet of chimney. A guide lube is extended from the reactor core to the top of the reactor chimney for easily un/loading a target under the reactor normal operation. Bur active coolant through the core can be quickly raised up to the rep of the chimney through the guide tube by a jet now This paper describes an analytical analysis that is the study of the now behavior through the guide tube under reactor normal operation and unloading the target. As results, it was conformed through the analysis results that the guide jet is suppressed under the rep of the chimney after modifying the orifice diameter of 37.5 ㎜ 10 31 ㎜.