Needful Systems Code Modifications

1. Needful Systems Code Modifications Lane Carlson, Charles Kessel Mark Tillack, Farrokh Najmabadi ARIES-Pathways Project Meeting San Diego, CA Jan 26-27, 2011

2. Overview • ASC has undergone many error corrections and modifications. • Laila’s comments on Oct. 2010 strawmen addressed. • Verification of internal algorithms, hardwired numbers, power fractions, comments to code nearly complete. • Continuing to update documentation and track changes. Last meeting’s actions items completed: • Output formatting cleaned up, included radial builds • Included He systems, costing for DCLL blanket • New pumping power models implementation Note: all comments on costing, volumes, etc. are comparing the aggressive strawman case, ACT

3. Input Needed, Received

4. Needful error corrections & modifications to the systems code • Mod #, date, • Error correction or modification • Lines of code affected • Person responsible for input • Status - complete, in progress, or pending • Notes

5. Laila’s comments on strawmen from last meeting have been addressed • Radial build now included • Volumes were missing 16x factor • VVx16 = 269 m^3 (was 16.8) • BCyl = 39.8, OK, confirmed by hand calc from CAD • PF coils total = 53 (was 3.3) • Cryodome = 1088 (65) … • ARIES-ACT volumes for 1/16th of torus? Yes Masses? Yes, OK • VV volume includes side walls of ports? Yes • Shield volume includes penetration shield? No, TBD • PF coil volume includes spares? Not in vol, only in cost, 14 spares

6. Addressing Laila’s comments continued • Costs: • Account 22 power core equipment now 1.46 B$ (was 2.1) • Bucking cylinder was erroneously multiplied by 16. Cost is now 30.7 M$ (538) aggr case • Uppercap = 3.5 M$ (was 59) • lowercap = 2.1 M$ (35) • cryodome = 9 M$ (144) • VV ok = 232 M$ • Plasma confinement, acct 22.2.0 = 497 (1040) • Cryostat, acct 22.2.1.4 = 144 (158) • Special materials: • Code now incorporates the 2.5x factor to account for Pb-Li in plumbing and outer loop outside fusion power core • With correction, 27.0 account now = 144M$ACT (was 58) • Total Mass of Liquid Coolant (DCLL, none in divertor) = 2596.7 (AT was 5269 tonnes)

7. Addressing Laila’s comments continued • Recirculating Power: • Code now incorporates 63 MW Paux (50) • Cryo is still separate. Using 2 MW for low temp SC. • Current drive power (unchanged) • We are working on refining pumping powers for divertor and blanket designs. • COE: • ACT aggr = 62.0 mills/kWh (2009$), (was 70.28)

8. Check P_recirculation (aggressive case) MW 105 63 26 23 13 2 * P_recirc = 232 MW * Blanket and divertor pumping powers have been refined (DCLL).

9. LCC comments on some volumes and costs 16x multiplier is currently used to break all the components into slices between the 16 TF coils - difficult to track!

10. Vacuum Vessel Volume • Where is the split between “main” and “outboard” volume? • VacuumVesselMain = 129.679 • VacuumVesselOutboard = 138.93 • Total Vacuum Vessel: 268.608

11. Plasma surface area erroneously included divertor surface areas Plasma surface area was FW + div surface area = 696 m2 Now, plasma surface area is plasma surface area = 497 m2 NWL becomes more realistic = 3.1 MW/m2 (2.2)

12. Neutron power distribution, power balance • Old f_geo_div overestimated power flow into divertor (~27%) • From Laila, 10% Pn deposited in divertor, 25% in IB blanket, 65% in OB blanket (A=4) • Power balance sanity check and visualization underway (Tillack) 10% 25% Pn 65%

13. Pumping Powers - Divertors • Prior pumping power was divided 50:50 between blanket and divertors for SiC. • Now we are implementing more fidelity (Wang, Burke). • Ppower for divertor designs now include: • Plate, no fins • T-tube • Finger • Capability • > 5 MW/m2 • ASC limits use to data range given

14. Pumping Powers - DCLL Blanket • Includes: • He pumping power in FW/blanket • Detailed MHD pumping power for Pb-Li in blanket (details Tillack) • Blanket thermal = Pn*M+FW Prad • ASC limits use to data range given

15. Les’s new costing, GDP, algorithms • Modified inflation factors after new GDP effective Nov. 2010 with 2005 year basis. • Costing algorithm updates mainly in: • 21.0 Structures and site facilities • 22.06 Main heat transfer and transport • 23.0 New turbine generator plant equipment costs • OLD c_23[0] = 243.34e6*(P_elec_gross/1200)0.83 • NEW c_23[0] = 360e6*(P_thermal_gross/2000)0.8 *(eta_brayton/0.6) • Some material costing questions updated and gaps in data cleared up. • New costing for high-purity Helium added, $70/kg. • Lower cost of LiPb (90% enriched) is significant $8.8/kg (22.6) 2009$

16. P_thermal • Code erroneously used P_thermal total (FWBS + div) in pumping power calculations without distinction. • Working to implement recoverable thermal heat from MHD liquid-metal and He pumps. • Different pump efficiencies for He (90%) & LM MHD pump (40%). • LM MHD pumps have low pumping efficiency (~40%) but up to 80% of thermal heat imparted to fluid through pumping and pressure drop can be recovered (Tillack, Morley). • For aggr case, P_pump_blanket = 13.3 MW, 33.3 MW wall-plug req’d, 26.6 MW recoverable. With thermal-to-elec efficiency ~50%, overall P_pump_blanket = 19.95 MW. • Helps P_net_electric = 1023.4 MW (was 1003.5)

17. Systems Code Flow Chart (medium detail) Working on detailed flow chart of engineering module

18. Summary & Future Work • Multiple errors corrected, modifications implemented. • Fixed errors revealed in Oct. 2010 strawmen. • Continuing documentation. • Finish correcting known errors still requiring attention. • Once final corrections have been made, “lock” the revision number and run physics cases. • Provide final strawmen after ASC overhaul.

19. Systems Code Modifications NOTE: See “ASC Legend 18.xls”