| 摘要 |
PROBLEM TO BE SOLVED: To simplify structure, and to increase the degree of freedom of arrangement in a reactor by installing a primary main circulation pump at the middle part of in-pile piping being opened in a high-pressure plenum. SOLUTION: In-pile piping 5 that is connected to inlet piping 2 and at the same time is opened in a high-pressure plenum 4 is provided, and one portion of the in-pile piping 5 is formed by a pump casing 7 passing through a reactor shielding plug 6. Then, a primary main circulation pump 3 is installed in the pump casing 7. The primary main circulation pump 3 is, for example, an annular linear induction pump, is installed in the casing pump 7 from the outside of the reactor shielding plug 6, and can be removed from the outside of the reactor shielding plug 6. The part between the pump casing 7 and the primary main circulation pump 3 is sealed by a sealing member 9, and the member 9 is set to bellows for surrounding the entire circumference of the primary main circulation pump 3, thus eliminating the need for independently arranging the inlet piping 2 and the primary main circulation pump 3 at separate positions.
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