| 摘要 |
PURPOSE:To set liquid level difference of the inner and the outer parts of an overflow part in a previously proper range by providing a cylindrical middle weir in an inclination on the halfway of a cylindrical reactor wall cooling structural wall whose side wall is set inclined. CONSTITUTION:Cold sodium introduced through a sodium introducing piping 1 from a high pressure plenum is agitated in a reactor wall cooling plenum 2 and flowed in a cooling passage formed of a reactor vessel 5 and a reactor wall cooling structural wall. Flowed-in sodium overflows the upper end part of the reactor wall cooling structural wall 3 as it is cooling the reactor vessel 5 to rise. Overflowing sodium is once stored in the middle weir 4 provided on the halfway of the reactor wall cooling structural wall 3 and further overflows to flow down to a cold pool 6. Either side wall of the reactor wall cooling structural wall 3 and the middle weir 4 is set inclined and the overflow is flowed down along the inclined wall. Therefore, the splash of the liquid can be prevented because the overflow is flowed down along the inclined wall without being directly flowed down on the liquid surface of the downstream. |
