Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors

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Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors ( advanced-nuclear-power-technology-program-supercritical-carb )

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After the blower the primary fluid is brought to the reactor vessel through the outer annulus space of the coaxial pipe. In the vessel it is directed downward in the downcomer and after turning the flow it enters the distribution plate. Following the distribution plate the primary fluid flows through the bottom reflector, core and upper reflector, which are all made of hexagonal blocks with cylindrical holes that serve as fuel cooling channels. Above the upper reflector the primary fluid enters the chimney above the core from which it is directed out from the reactor vessel to the outlet piping, which brings the primary coolant to the intermediate heat exchanger. After leaving the intermediate heat exchanger the primary coolant enters the pump or the blower. An alternative design (not used in this analysis) under investigation considers placing the intermediate heat exchangers inside the vessel, which would further decrease the required blower power. Outlet Duct Inlet Duct Outlet Plenum Top Reflector Downcomer Core Inlet Plenum Bottom Reflector Distribution Plate Figure 7.1 Primary loop geometry of a helium cooled gas fast reactor (GFR) [from Francois, 2003] 7.3.2 Lead Bismuth Alloy Primary System In the case of lead bismuth cooling the pumping power is significantly reduced. Therefore the detailed modeling that was used for the helium primary system is not 160

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