P21-10 改良沸騰水型原子炉内インターナルポンプの厚肉スリーブノズルの開発

概要

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The larger diameter nozzle with the thicker sleeve for the reactor internal pump (RIP) in the Advanced Boiling Water Reactor (ABWR) has been studied. The appropriate nozzle diameter was investigated through experiments and calculations, taking hydraulic performance and flow characteristics into consideration. The RIP with the large diameter nozzle of 492mm maintained good hydraulic performance and flow characteristics of the current nozzle (445mm) RIP. Increase of hydraulic losses for the 492mm nozzle was within 1 meter (2.5%) of the head from that for the 445mm nozzle. As this variation was within the allowable level of the current RIP, the RIP with the nozzle diameter of 492mm can be used in the next ABWR. Moreover, the flow pattern of the 492mm nozzle in the RPV was almost the same as that of the 445mm nozzle.
2002-06-14