| 摘要 |
PROBLEM TO BE SOLVED: To provide a reactor coolant recirculation system capable of improving workability and accessibility of a lower drywell by simplifying the cooling water system of the internal pumps and reducing the number of internal pumps without largely reducing core flow than a conventional plant even in failure and the like of power source sections. SOLUTION: A plurality of internal pumps 3 and an internal pump heat exchanger 11 are connected with a coolant pipe 10, and inside the internal pump heat exchanger 11, a flow path for cooling water supply separated in accordance with every internal pump 3 is provided. The placing positions of the internal pump 3 are set at the position equally separated into ten circumferentially as viewed from the bottom center of a reactor pressure vessel. At the positions almost equally separated into ten, less or equal to 9 and more or equal to 4 internal pumps are placed. COPYRIGHT: (C)2006,JPO&NCIPI
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