2441 ABWR インターナルポンプ下流の流動特性に及ぼすノズル径の影響

概要

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The RIP has been studied to use the larger diameter nozzle with the thicker sleeve in the advanced boiling water reactor (ABWR). The optimum nozzle diameter was investigated through experiments and calculations, taking hydraulic performance and flow characteristics into consideration. The large diameter nozzle of 492mm did not affect the hydraulic performance or the flow characteristics in the reactor pressure vessel (RPV) significantly, compared with the current nozzle (445mm). Increase of hydraulic losses for the 492mm nozzle was within 1 meter (2.5%) of the head from that for the 445mm nozzle in the RPV. 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.
社団法人日本機械学会の論文
2000-07-31