| 摘要 |
852,957. Nuclear reactors. UNITED KING- DOM ATOMIC ENERGY AUTHORITY. June 13, 1958 [June 24, 1957], No. 19897/57. Class 39(4). In a nuclear reactor having a re-entrant coolant circuit comprising two concentric tubes tho inner tube can be rotated about its axis to restrict the flow of coolant. Fig. 1 shows part of a graphite moderated sodium cooled reactor having hot and cold sodium headers 350 and 351. A structural tube 353 passes through the headers into the core and is closed at its lower end. An inner tube 357 has a flange 358 with a skirt 359 in which are ports complementary to ports in the outer tube ; the inner tube also has ports connecting with the hot sodium header. Coolant flows as shown by the arrows ; the inner tube contains fuel elements (not shown). Rotation of the inner tube controls the coolant flow by altering the overlap between the ports in the skirt and outer tube. In another form, the upper end of the outer tube may have an integral internal flange through which pass ports complementary to ports in the inner tube, while the ports in the outer tube connecting with the cold header are unobstructed ; alternatively the upper end of the inner tube may have an integral external flange. |
