| 摘要 |
<p>A double tank type fast breeder reactor including a reactor vessel (1), and a tank (11) of a secondary cooling system located outside the reactor vessel. The reactor vessel contains a core (3) and installations of a primary cooling system (4, 8), and the tank contains circulation pumps (13) of the secondary cooling system and steam generators (15) alternately located in the tank, and a body of sodium (12) serving as a secondary coolant located at outer peripheries of the circulation pumps and steam generators. The tank includes an annular portion defined in the tank between walls of the tank and reactor vessel serving as a path of circulation of the secondary coolant. Each steam generator is small in width and has a shroud (21) surrounding heat transfer tubes (20) defining a narrow annulus between one side wall thereof and the reactor vessel and another narrow annulus between an opposite side wall thereof and the tank, and each circulation pump of the secondary cooling system has a shroud (22) defining a narrow annulus between one side wall thereof and the reactor vessel and another narrow annulus between an opposite side wall thereof and the tank.</p> |
