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ultimately be more cost effective to maintain as simple a power conversion system as possible, even though a lower efficiency is found. Trade-off studies comparing efficiency, complexity, and viability with cost are needed to help establish the payoff potential for more complicated systems. Further analyses must be completed to determine the penalties associated with lowering the pressure in the reactor vessel by lowering the pressure ratio or including a turbine- generator unit before to the reactor vessel inlet. Thermal Hydraulics Analysis at Full Power Scoping analyses have shown the range for the pin size and pitch. Further, more sophisticated analysis is required to determine the optimized configuration in relation to the maximum fuel temperature, cladding temperature, and core pressure drop. Analyses are necessary to determine if the core should have ducted assemblies to better control the flow in the core. Additional study is also essential in determining the most appropriate mechanism for flow distribution in the core, either by flow orifices in the lower grid structure or a varied pitch configuration. Natural Circulation Flow Modeling Natural circulation flow analyses require further modeling development of the code CD3-SC to determine both steady-state and transient flow conditions and optimization for decay heat removal without the compressor operating. Continued investigation to determine the flow through the power conversion system and optimization of the heat exchanger elevation is necessary. Analyses are required to determine the potential for an auxiliary cooling system design. Validation work should continue on the SNL S-CO2 flow loops to develop validation experiments and results. Auxiliary Systems Analyses and development of auxiliary systems need ongoing study. Development of a volume control system using a pressurizer/accumulator, as well as the gas makeup and cleanup system is required. An auxiliary decay cooling system requires further development. The features for an emergency core cooling system need study and development. The pressure vessel vault design and core refueling system must be developed. The seismic and operating requirements for the containment structure and ventilation system need to be established and incorporated into the design effort. Accident Analysis Development of the safety case for accident analysis must begin. Once the CD3-SC code is finalized with a baseline configuration, anticipated transients, ATWS, and LOCAs can be evaluated from a plant thermal hydraulics perspective. Other accident analyses codes need to be identified and modified for the SC-GFR concept. Economic Analysis An economic analysis is essential as the cycle, plant, and reactor are optimized to determine if this type of reactor concept and fuel cycle would be economically viable. This report has identified that the initial core loading, the PCHE recuperators, and the heat rejection system could be significant drivers in the plant’s capital cost. The use of stainless steels to minimize corrosion will also have a significant impact in the plant’s capital cost. More rigorous corrosion testing needs to be performed to determine where low cost materials can be used in the plant. 50PDF Image | Supercritical CO2 Direct Cycle Gas Fast Reactor (SC-GFR)
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