1. ARIES Study L. M. Waganer, 9 August 1999 1 Power Cycle Modeling and Cost Validation L. M. Waganer The Boeing Company 7 October 1999 E-meeting

2. ARIES Study L. M. Waganer, 9 August 1999 2 Design Basis for Large Cogeneration Plant Use the ARIES-AT power core as the basis for the large hydrogen/electricity cogeneration plant –Scale plant size to 3 and 4 GWe (two cases) –Use best ARIES blanket and power cycle configuration –Add heat exchanger downstream of helium turbine for low temperature heat for hydrogen electrolyzer

3. ARIES Study L. M. Waganer, 9 August 1999 3 Assess Impact to ARIES-AT Power Cycle to Remove Electrolyzer Heat Rene Raffray conducted an analysis of latest and highest efficiency power cycle Scaled results to 4 GWe (net) regime Cycle efficency impact assessed Modes of operation –Nominally 4 GWe operation (no hydrogen) –Same thermal output with 2 GWe to grid plus 2 GWe and 375 MWt to electrolyzer

4. ARIES Study L. M. Waganer, 9 August 1999 4 Modified Power Cycle Schematic All electric operation would bypass electrolyzer HX - Cycle efficiency is 60.2% Extracting 375 MWt from HX lowers efficiency to 57.3% - Maximum helium temperature is maintained at 1100°C with same thermal power input - Less heat is recovered in recuperator - Lower temperature coolant to divertor and blanket - Reduced coolant flow rate 1100°C/1100°C 704°C/ 687°C

5. ARIES Study L. M. Waganer, 9 August 1999 5 Power Cycle Data ParameterW/o ElectrolyzerW/Electrolyzer Thermal Power, MWt80308030 Electrolyzer Thermal Power, MWt 0 375 Electrical Power to Grid, MWe42022000 Elect. Power to Electrolyzer, MWe 02000 Brayton Cycle Efficiency, %60.257.3 Carnot Efficiency, %77.677.6 The bottom line is that the same plant can generate 202 MWe more in all electric mode. In the cogeneration mode, 375 MWt and 2000 MWe is used in the electrolyzer to generate 2220 MW H 2 (enough hydrogen for 2.5 million fuel cell powered cars.)

6. ARIES Study L. M. Waganer, 9 August 1999 6 Material Cost Validation - Stainless Steel Basic Structure - PPPL asked Boeing (L. Waganer) to develop a preconceptual design and cost estimate for the FIRE tokamak support structure Support structure system includes flexible gravity supports, assembly structures, and radial and vertical restraint structures Material is mostly 304 or 316 stainless steel Radial compression rings and center tierod column are laminated structures to reduce eddy currents

7. ARIES Study L. M. Waganer, 9 August 1999 7 Schematic of FIRE Support Structure

8. ARIES Study L. M. Waganer, 9 August 1999 8 Structure Cost Results Data has not been accepted by PPPL, so handle data as preliminary and proprietary Structure is large and heavy Average unit cost (from Boeing) ~ $42/kg –First of a kind –10th of a kind @ 85%LC ~ $24.5/kg –Assembly and testing costs not included –Integrating contractor fees not included These data seem to correlate well with ASC costing algorithms