| 摘要 |
<p>An integrated head package (41) for a nuclear reactor has a pressure vessel closure head (43) with control rod drive mechanisms (45) thereon enclosed in a shroud (51), and a plurality of vertical lift rods (55) secured to the vessel head (43) with a missile shield plate (69) extending between the lift rods (55) and vertically slidably retained between spaced stop members (73, 73 min ) adjacent the upper ends (65) of the lift rods (55). A lift ring (105) is secured to the missile shield plate (69), preferably through attachment to support blocks (81) secured to the upper surface of the plate (79). Impact forces of a missile against the lower surface of the missile shield plate (97) are transferred to a lifting force and are not transferred to the lifting rods (55), head lugs (21), closure stud (25) and pressure vessel supports.</p> |
