| 摘要 |
PURPOSE:To facilitate the access to a connecting position of a coupling of an in-pipe structure side and a coupling of a nuclear reactor container side by forming a nuclear reactor reactivity control use piping structure which has been constituted so that a part for passing through the nuclear reactor container is positioned in the upper part of the reactor core. CONSTITUTION:The upper end opening part of a nuclear reactor container 2 of a nuclear reactor 1 is closed by a container cover 3. In the nuclear reactor container 2, the upper reactor core supporting plate 4 and a reactor core tank 5 are supported. The upper reactor core plate 8 is positioned on the top part of a reactor core 7. In a fuel aggregate, a structure material is formed by the upper nozzle 13, the lower nozzle 14, a supporting grating 15 and a control rod guide thimble 16. Since an inlet pipe 35 has been drawn to the upper plenum part 41 by using a dead base between a baffle board 31 ad a reactor core tank 5, a connecting position to the inlet pipe 35 of the nuclear reactor container side can be placed on the upper side of the reactor core 7. In such a way, by removing the upper structure 42, an access can be executed simply to the connecting position. |
