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Recently, many concepts, in which passive and simplified functions are actively adopted, have been proposed for next-generation LWRs. Natural-circulation BWR, which uses natural-circulation to induce ...flow to the reactor core, is one such proposal. However, it is pointed out that flow instability may occur in a natural-circulation flow loop that includes two-phase flow, depending on structural and thermal-hydraulic conditions of the loop during a start-up process. This greatly influences the feasibility of the concept because the instability makes output power increase difficult. In this work, the effects of system pressure and non-heated riser on boiling flow instability are experimentally investigated in order to understand the mechanism of flow instability at low pressure and low heat flux conditions during the start-up process of a natura1-circulation BWR. The interaction between channels is also investigated.続きを見る
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