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PRECOOLER COMPRESSORS FLOW MERGE HIGH TEMPERATURE RECUPERATOR FLOW SPLIT TURBINES PRECOOLER COMPRESSORS FLOW SPLIT GENERATOR REACTOR TURBINES GENERATOR REACTOR LOW TEMPERATURE RECUPERATOR LOW TEMPERATURE RECUPERATOR FLOW MERGE HIGH TEMPERATURE RECUPERATOR Figure 13.15 Recompression cycle with one and two stages of re-heat Figure 13.13 and Figure 13.14 show the optimum designs for different core outlet temperatures for both the PbBi and helium primary systems with and without reheat (for re-heat cycle layouts see Figure 13.15). The difference between the two fluids is apparent as PbBi primary system pumping power is so low that the effect of increasing the core outlet temperature and thus reducing the mass flow rate is negligible. This is not true for the helium primary system where high reactor core outlet temperatures are required. The calculated data show that there is only about 0.7% saving between the single and double re-heat cases, which leaves, for a 300 MWBeB plant, costing about 1000 $/kWBeB, only about 2.2 million for the additional investments associated with the second stage of re-heat. Hence one cannot draw any conclusion other than that the use of more than one stage of re-heat is not attractive. On the other hand using one re- heat stage at 660oP PC introduces ~ 2.3% savings, which again for a 300 MWBeB plant costing 1000 $/kWBeB means about 7 million dollars. Even that might not be sufficient to justify the additional investment of the re-heat loop with another turbine and additional piping. The whole turbomachinery with generator cost is 46,000K$. Thus it is reasonable to expect that additional turbine body cost will be on the order of 10,000K$. In the case of lead alloy cooled reactors the intermediate heat exchangers are located inside the vessel. Re-heat increases the number of penetrations through the vessel and the additional volume of re-heaters may not fit inside the reactor vessel. Placing them outside would introduce a significant capital cost increase. A final answer would require detailed economic analysis and a mature layout of the primary system and re-heaters (which may require an intermediate loop if they do not fit inside the reactor vessel). The reason why 287PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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