| 摘要 |
<p>An integrated head assembly (14) for a nuclear reactor pressure vessel (10) includes a closure head (20) with CRDM assemblies (22) extending upwardly from the head. A CRDM seismic support (24) disposed above the closure head provides lateral support for the CRDM assemblies. The seismic support also has air flow holes which communicate with the interior of a shroud (32) enclosing the CRDMs and extending upwardly from the closure head to the seismic. The shroud has an air port (96) in direct air flow communication with the surrounding atmosphere so that the closure head, shroud and seismic support define an air flow passageway directly communicating with the surrounding atmosphere via the air port and without the extensive ductwork and, therefore, with substantially less power. A missile shield (26) disposed above and in air flow communication with the seismic support provides a lightweight, compact physical barrier for removing energy from dislocated objects such as CRDM drive rods.</p> |
