| 摘要 |
1427217 Nuclear reactors SIEMENS AG 26 Nov 1973 [28 Nov 1972] 54821/73 Heading G6C In a nuclear reactor installation, at least one component of the coolant circuit has a generally cylindrical external shape and is surrounded by an envelope comprising annular members of pressure, flame and explosion-proof thermallyinsulating material, axial and circumferential elements being provided to resist bursting of the envelope. As shown in Figs. 3 and 4, a steam generator 9 is surrounded by an envelope made up of rings 14 each comprising part-annular segments 15. The rings are stepped so as to nest together. The material of the segments 15 is concrete with gas inclusions. Each segment 15 includes a sheet-metal envelope 12, and outer tensile cylinders 17 are provided. As particularly shown, the latter comprise steel rings 18. The envelope is completed by upper and lower steel plates 20, 21, the latter of which is penetrated by a port stub 26 affording an access manhole. Axial bracing wires 22 extending through the rings 14 are of such length as to be placed under suitable stress when the steam generator expands upon heating to operative conditions. The steam generator 9 is connected to the reactor vessel 2 by a coolant duct 6 (Fig. 6) surrounded by part-annular segments 30 of insulating concrete and a tensile reinforcement 31. Tension elements 32 extend in the longitudinal direction of duct 6 and thermal expansion and contraction movements are permitted by mounting the steam generator on a support platform 34, there being an intermediate layer 33 to facilitate sliding. In the case of a coolant circuit component whose outer shape deviates substantially from cylindrical, the envelope is supplemented by metal shells 36, 37 (Fig. 7) shown here as surrounding pump 8. The shells are secured together at co-operating flanges 41 by bolts 42. End flanges 45 may locate ends of tensioned bracing elements extending to adjacent portions of the envelope. |
