| 摘要 |
<p>The invention relates to a sealing device for sealing a leak inside a reactor pressure vessel in which the output of the reactor is controlled by means of control rods (2). The control rods are operated by means of control rod drives which are connected to the control rod by means of rods (3) positioned in tubes (4) extending through openings (5) in the reactor wall (1). Around each tube (4), on the inside of the wall (1), there is arranged a stub tube (6) which communicates with said opening (5) and one end of which is joined to the tube (4) by means of a weld (8). To prevent leakages from a possible crack 9 which may easily occur close to the weld (8) and may develop into a leak, an inner sealing sleeve (10) of a soft metallic material and with an outer conical surface is fitted over the tube (4) and the stub tube (6), and an outer sealing sleeve (12) of a hard metallic material and with an inner conical surface is fitted over the inner sealing sleeve (10). On each side of the crack (9) special contact surfaces are formed between the inner sealing sleeve (10) and the tube (4) or the CRD stub tube (6). As the outer sealing sleeve (12) is pressed in over the inner sealing sleeve (10), the latter is pressed by the conical surfaces, moving against each other, against the tube (4) and the stub tube (6), thus providing sealing at the contact surfaces.</p> |
