Patent ID: 6546066
Filing Date: 2003-04-08
Classification: G21C,Y02E

Abstract:
An integrated head assembly for a nuclear reactor having a reactor vessel closure head with a dome-shaped portion and three lifting lugs, wherein the reactor vessel closure head supports a plurality of control rod drive mechanisms, the integrated head assembly comprising:(a) a lifting assembly attached to the reactor vessel closure head lifting lugs, the lifting assembly comprising i) a ring beam having a generally upright cylindrical lower portion having a top edge and an upper flange portion that extends outwardly from the top edge of the cylindrical lower portion, the ring beam coaxially disposed on top of the reactor vessel closure head; ii) three vertical lift rods, each lift rod having a proximal end comprising a connecting member that engages one of the lifting lugs and the ring beam, and a distal end; iii) a spreader plate attached to the distal end of the lift rods; and iv) a tripod releasably attached to the spreader plate; (b) a cylindrical support structure extending upwardly from the ring beam; (c) a shroud assembly attached to the support structure, the shroud assembly encircling the control rod drive mechanisms; (d) a baffle assembly attached to the support structure and disposed between the shroud assembly and the control rod drive mechanisms; (e) a control rod drive mechanism cooling system comprising a plurality of fans and a plurality of vertically extending ducts, the ducts each having an air inlet end disposed near the reactor vessel closure head and an outlet end disposed above the inlet end and fluidly connected with at least one of the fans; and (f) a missile shield disposed above the control rod drive mechanisms.