Inventors:
Louis J. Malandra - Elizabeth Township, Allegheny County PA
Robert J. Leduc - Columbia MD
Michael F. Hankinson - Monroeville PA
Edward F. Kowalski - Pittsburgh PA
Assignee:
Westinghouse Electric Corp. - Pittsburgh PA
International Classification:
G21C 1900
G21C 101
Abstract:
A modular head assembly (110) for a nuclear reactor pressure vessel includes a closure head (112) having control rod drive mechanisms (116) mounted therein and projecting thereabove. Cooling baffles (118) provide air paths for cooling air for the CRDMs (116), and a lower air manifold (120) is fluidically connected to the cooling baffles (118) as well as to vertically upwardly extending air ducts and manifolds (136, 138, 140). Axial flow exhaust fans (126) are fluidically connected to the ducts (140) through means of plenum chambers (162) with the latter mounted upon a missile shield plate (134). The missile shield plate (134) is fixedly mounted upon closure head lift rods (144) as is a seismic support platform (128). The air ducts (140) pass through the seismic support platform (128) and the missile shield plate (134), and a centralized cable connector plate (164), to which all electrical cables from the CRDMS, thermocouples, and control-rod rod-position-indicator coils are routed and connected, is mounted upon the seismic support platform (128) and is interposed between the seismic support platform (128) and the missile shield plate (134). By means of the modular head assembly (110) of the present invention, all of the aforenoted components may be lifted or lowered along with the closure head (112) as one integral unit, all components are physically located within the peripheral envelope of the closure head (112), and existing facilities can be accordingly modified.
