| 摘要 |
PURPOSE:To relieve thermal stresses by a method wherein temperature differences between a tube plate and a tube plate support and between the interior of the tube plate and the outer peripheral part of the tube plate are rendered to be small. CONSTITUTION:The tube plate support 2 is shifted to an outer shroud part 9 in order to realize the structure so as to bring sodium of secondary side or in tubes into contact with the outer peripheral part 8 of the tube plate. Furthermore, through holes 6 to communicate the outer peripheral part 8 of the tube plate with the tube hole 10 at the outermost layer are provided. Because the structure mentioned above renders to bring the sodium liquid of secondary side into contact with the outer peripheral part 8 of the tube plate or the part B and the sodium liquid of secondary side contacting to the outer peripheral part 8 of the tube plate can be circulated with the sodium liquid passing through the through holes 6 and, in addition, the tube plate support 2 is connected with the outer shroud at the position apart from the upper tube plate 3, the temperature differences between the upper tube plate 3 and the tube plate support 2 and between the interior 7 of the tube plate and the outer peripheral part 8 of the tube plate can be reduced, resulting in relieving the thermal stresses in the tube plate support structure and in the outer peripheral structure of the tube plate. |
