| 摘要 |
A nuclear reactor coolant recirculation equipment includes a plurality of internal pumps which are installed around a bottom portion of a reactor pressure vessel of a boiling-light-water reactor, power-supply sections for supplying current to the internal pumps, an internal pump cooling system, for cooling the internal pumps, including cooling water pipes and heat exchangers connected to the cooling water pipes, and auxiliary cooling water pumps for supplying the cooling water to the heat exchangers, respectively. The positions are set as internal pump installation positions at substantially same interval in a circumferential direction around a central portion of the bottom portion of the reactor pressure vessel, and nine or less and four or more numbers of the internal pumps are installed at the ten internal pump installation positions.
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