Patent Number: 
Section: claims

1. A modular reactor head area assembly installed on a reactor head, the modular reactor head area assembly comprising;a seismic support structure comprising a seismic cap plate that supports an upper portion of a control rod driving apparatus inserted thereinto, and a seismic support ring beam coupled to and surrounding an outer circumference surface of the seismic cap plate;an upper module that is an assembly of components located at an upper portion of the seismic support structure and comprises an upper shroud shell detachably coupled to the seismic support ring beam, a plenum disposed on an upper portion of the upper shroud shell, a cooling fan disposed on the plenum, a shackle coupled to the plenum, and a tripod coupled to the shackle;a lower module that is an assembly of components located at a lower portion of the seismic support structure and of which an upper portion is coupled to the seismic support structure; anda main column accommodated in the upper module and lower module, and of which a first end is detachably coupled to the reactor head and a second end is detachably coupled to the tripod. 2. The modular reactor head area assembly of claim 1, wherein the upper module comprises:an upper baffle that is disposed in the upper shroud shell, forms an air path along with the upper shroud shell, and is coupled to the seismic support ring beam. 3. The modular reactor head area assembly of claim 1, wherein the lower module comprises:a lower shroud shell formed as a cylinder with open upper and lower ends;a lower baffle disposed in the lower shroud shell and forming an air path along with lower shroud shell; anda plurality of control rod driving apparatuses coupled to the reactor head. 4. The modular reactor head area assembly of claim 1, wherein a flange is disposed on a lower end portion of the upper shroud shell to protrude outwards, and is coupled to the seismic support ring beam via a bolt. 5. The modular reactor head area assembly of claim 1, further comprising:a cable support ring beam coupled to an external side of the upper shroud shell; anda plurality of cable support wires coupled to the cable support ring beam, wherein a first end of each of the cable support wires is coupled to the cable support ring beam, and a second end is coupled to the cable support ring beam through the upper shroud shell. 6. The modular reactor head area assembly of claim 1, further comprising a cable connection plate disposed on an external side of the upper shroud shell and coupled to a cable extending from the control rod driving apparatus.