| 摘要 |
PURPOSE:To lower the manufacturing cost, as well as to further facilitate drainage in the titled device, by uniformizing the periphery of a gap between a press part holding the foot of a bellows (a ring fitted to the inside of an outer shell) and a part which is made of metallic sponge. CONSTITUTION:When sodium is injected into an outer shell 1 from the primary sodium nozzle, a ring 20 on the outer surface of an inner shell is depressed by the fluid force. Then a mass of metallic fiber 22 having very large elastic range, being filled between the ring 20 on the outer surface of an inner shell and a ring 21 on the inner surface of an outer shell, is pressed into dense state. Accordingly, the fluid resistance is increased, and a bypass flow can be shut off. At that time, evenly depressed gap can be obtained, because the effect received by the rings 20 and 21 from the mass of metallic fiber is nearly equal, being supported by the whole surfaces of these rings. On the other hand, when sodium is drained at the regular inspection or the like, the supply of sodium is shut off. Then the fluid force received by the ring 20 is decreased, and the mass of metallic fiber is turned into thin state, so that the fluid resistance is decreased, and sodium can be drained automatically. |
