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Dostal (Ref. 2.1) evaluates the difference between helium and S-CO2 direct cycle power plants, and finds their busbar costs virtually identical: i.e. S-CO2 / He = 1.004, which is well within the attendant imprecision of such estimates. From this we can infer the S-CO2 indirect cycle value shown in row (9) at the bottom of the table, by also equating it to the corresponding entry in row (3) for its helium counterpart. Table 2.2: Summary of Projected Generation Costs * Busbar Cost System Mills/kWhre 1. Steam Cycle MHTGR (Ref. Case) 51.0 2. He Gas Turbine MHTGR, Direct 40.4 Cycle 3. He GT MHTGR, Indirect Cycle 49.0 4. Advanced LWR 44.2 5. Coal, Pulverized 48.9 6. Coal, IGCC 49.1 7. Gas, CCGT 48.9 8. S-CO2 ,Direct Cycle (Dostal) 42.3 9. S-CO2 : Gas Turbine, He to S-CO2 49.0 Indirect Cycle (inferred) 10. * Entries 1-7 are from Ref (2.2) The final entry in the table, row (10) displays an cycle employing “LPC”, a liquid (Na, LBE, FLIBE) as observation made earlier that it would incur roughly half to-gas indirect cycle. Reference (2.8), currently in press, provides relevant comparisons between ALMR Rankine and Brayton cycle units. Based on these results several observations are of interest: a. The S-CO2 LPC version generates electricity about 10% cheaper than the reference case Rankine cycle MHTGR. b. It is competitive with the fossil options cited. c. It is more expensive than direct cycle GT concepts. d. At this juncture it is not yet certifiably less expensive than an advanced LWR. Point (a) is also supported by Dostal’s plant efficiency comparisons for LBE cooled indirect cycle reactors reported in Ref (2.3) and reproduced here as table 2.3. The S-CO2 version delivers about 5% more electricity than the Rankine option, with a further Ratio 1.00 0.79 0.96 0.87 0.96 0.96 0.96 0.83 0.96 S-CO2: Gas Turbine, liquid primary coolant (LPC) to S-CO2 Indirect Cycle (estimated) ≈ 46 ≈ 0.90 estimate for an indirect S-CO2 primary coolant, based on the the efficiency penalty of a gas- 14PDF Image | Report No: MIT-GFR-014 Topical Report 300 MWe Supercritical CO2 Plant Layout and Design
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