P21-13 多段蒸気インジェクタの BWR 給水加熱系への適用

概要

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In order to realize the simplified BOP (balance of plant) system of BWR plant, the authors developed the basic designs of feedwater system simplified by application of steam injector. Basic specification of simplified steam injector feedwater heater system (SI-FWH) was developed based on system designs and thermal efficiency evaluation. Test facility was constructed based on system specification selected in accordance with analysis results of plant thermal efficiency. The steam pressures used in the selected best system for low pressure feed water heaters are 0.05MPa, 0.10MPa, 0.21MPa and 0.40MPa are almost the same pressures as the current ABWR's. Improved steam injectors for feedwater heater system were studied by thermal hydraulic analyses and the test model attained the 4-stage specifications. The 4-stage injectors succeeded in raising the water temperature to 144℃. The parallel multistage steam injectors rationalize the feedwater system by eliminating the twelve neck-heaters, and prevent the chrome ion, which is dissolved from the stainless steel heater trbe, introducing into the RPV (reactor pressure vessel).
2002-06-14