| 摘要 |
<p>A steam generator upper support arrangement provides restraint to the steam generator during operating and non-operating conditions, for loading forces resulting from seismic and postulated accident conditions, while allowing for free thermal expansion of the steam generator in the radial, lateral, and vertical directions. Four embodiments of the present invention are described, all of which maintain a nominal gap between the steam generator and the containment building structure to provide adequate restraint. In one embodiment, inclined bumpers (63) are placed at predetermined angles (69) with respect to the load path (47), such that as the steam generator is thermally displaced and incline angles of the bumpers will compensate for the expansion and maintain a nominal gap (61) therebetween.</p> |
