Finalized Systems Code Modifications & New Aggressive Strawmen Suggestions

1

Lane Carlson, Charles Kessel,Stephen Efthyvoulos

ARIES-Pathways Project MeetingBethesday, MD April 4-5 , 2011

Finalized Systems Code Modifications

& New Aggressive Strawmen

Suggestions

2

ASC Overview

• ASC has undergone many error corrections and modifications.• Laila’s comments from Jan. 2011 presentation addressed

• Laila and Les’ comments on Feb. 2011 interim printouts addressed

major errors and discrepancies have been corrected, believability

of code improved

• Refined strawmen suggested for ARIES Technology & Physics

Assessment of Advanced and Conservative Tokamaks (ACT)

• ARIES-ACT-I (aggressive technology, aggressive physics)

• ARIES-ACT-II (aggressive technology, conservative physics)

• Continuing to update documentation and track changes.

• New multi-filtering capability in VASST GUI.

• Working on converting DCLL module to generic build structure.

3

Action Items Completed from Jan. 26 2011 meeting

• Fix radial builds discrepancies. Done• Adopt SOL = 10 cm. Done• Adopt 50 MW aux power from 63 MW. Done• Correct FW and divertor surface areas per Laila’s pres. Plasma SA used

to include divertor SA. Now, plasma SA ~547 m3 w/ 10 cm SOL. IB FW

~133 m2, OB FW ~375 m2, total ~508 m2, Div SA ~191 m2 (all 6)• Printout all parameters, costing algorithms, material properties. Done• Check number, volume, cost of PF modules including spares.

• 50 PF coils total accounted for in volume & costing• 36 “active” (14 top, 14 bottom, 8 central solenoid)• 14 “spares” below bottom coils

• Theoretical plasma facing surface better defined (plasma SA + 10cm

SOL). Done• Separate pumping powers for He and PbLi in blanket. Working• Clarify in output that heating and CD powers are steady-state. Done

4

Input Needed, Received for ASC

Waganer New fabrications costs, algorithms, updated GDP

El-Guebaly ASC output formatting, NWL distribution, core radiation

Tillack MHD pumping power correlations for SiC, DCLL blankets

Rognlien Edge power flows

Kessel Revised physics module. Aspect ratio scans

Wang

All

Divertor pumping power correlations.

Consensus on April 2011 strawmen

5

Generic radial build proposed

• Fixed: IB FW/B = 35 cm, OB FW/B = 30 cm • Need to remove customized naming designations.• Generic radial build will allow true modularity of blankets.• Leave room for possible future layers.

Work

in progre

ss

6

Laila’s comments from interim printout were addressed

• LiPb includes 2.5x BOP factor, discrepancy is due to new lower cost, eutectic mixing. To be discussed

• Ppumpdiv ~ 20-25 MW using plate divertor

• Ppumpblanket ~ 5-10 MW using SiC blanket with dual-coolant

blanket and mechanical LM pump, 90% efficient• Accounts 21.2 Power core building (vol ~ 141,000 m3), 21.7 Hot

cell building were zero, now corrected. 21.7 = 21.1*0.34 M$• Power core support structure is now 20% FPC vol (783 m3) = 156

m3 * 0.2 M$/m3 = 31 M$. Refine?• NWL_ave fixed, now uses 10cm SOL + plasma SA ~= 2.8 MW/m2

• Dual-coolant costing algorithm implemented for Heat Transfer and Transport for Accnt 22.6.

7

Laila’s comments from interim printout were addressed

• Penetration shielding = 25%• Shield thickness vs NWL scale with correct NWL_ave• Updated part compositions and costing.• To do: separate IB and div shield.

+ MANY others, documented in “Laila validation re interim strawmen, LCC ed 2.doc” and “ASC Legend 23.xls”

OB bl

VV

HT shield

IB bl

Divertor

Sepatrix

Repl HT shield

FW IB

Plasma

FW OB

8

Les’ comments from interim printout were addressed

• System of checks and balances - caught

many minor errors and discrepancies.

• Part compositions and volumes verified

by hand vs. computer calculations.

• Changed VV composition to composite

structure, $43.44/kg, among others.

+ MANY others, documented in “Validation of 2_11 ASC Strawman (2_23_11) LW, LCC ed 2.doc” and “ASC Legend 23.xls”

9

Mark contributed SiC blanket pumping power

• No He-pumping

• MHD pumping power for PbLi in IB FW/B only, OB is expected

to be much lower

• Blanket thermal = Pn*M+FW Prad

• ASC limits use to data range given

10

Items to address

• Support structure volume and mass algorithms.

• Main Heat Transfer and Transport (MHTT) - power core and primary loop.

• Power conversion system for MHTT - Brayton cycle?

• He mass in Brayton cycle?

• Direct cycle heat exchanger to turbine? Or IHX for PbLi to He. IHX He

volume? Turbine cycle working fluid volume?

• Nuclear-grade materials and safety-related components cost factors, PbLi

costing details - TBD Laila

11

Chronicle of error corrections,

modifications

• Major discrepancies have been resolved such that we are confident issuing strawman results.

• Minor work is still ongoing, will be available in subsequent revisions.

• Revision # locked at 30• All above are implemented.• All below are for future work.

12

VASST plots - compare with Kessel Jan ‘11 pres

• Same scanning range as Kessel except betaN down to 0.0275

13

Bt vs betaN, CC A

• The operating space for aspect ratio scans: A = 4.0, 3.0, 2.5, 2.0

14

fBS vs betaN, CC A

15

R vs Qdivoutb, CC A

Qdivoutb < 15 MW/m2

16

R vs Xnwall, CC A

Xnwall 2-4 MW/m2

17

n/nGW vs H98, CC A

18

qMHD vs betaN, CC A

19

Conclusions from aspect ratio scans

• Effect of aspect ratio scans: A = 4.0, 3.0, 2.5, 2.01. as A is reduced the major radius is dropping2. as A is reduced the toroidal field at the plasma drops3. as A decreases Ip increases4. as A decreases the max field at the TF coil is rising5. how does the engineering solution change??? magnets, build...

1. 2.

20

Aspect ratio scans builds

A = 4.0 A = 3.0 A = 2.5

• Drawn by systems code

21

April 2011 Strawmen proposed

• ARIES-ACT-I (aggressive technology, aggressive physics)

• SiC blanket, ηth ~ 58%, βN = 0.04 - 0.06

• ARIES-ACT-II (aggressive technology, conservative physics)

• SiC blanket, ηth ~ 58%, βN = 0.0275 - 0.04

22

Systems code scanning parameters used

SiC blanket only Range, aggressiveaggressive

Resolution

R (m) 4.0 - 8.0 0.5

BT (T) 4.0 - 9.0 0.5

βN 0.0275 - 0.06 0.0025

Qcyl (q95) 3.5 - 5.4 0.2

Q gain 15 - 40 5

n/nGr 0.5 - 1.1 0.05

Impurity fraction 0.001 - 0.003 0.001

Kappa plasma elong. 2.0 - 2.2 0.2

Aspect ratio 4.0, 3.0, 2.5, 2.0 -

Output is ~6.2M points

23

Hardwired systems code parameters

SiC blanket Value

Eta_CD 0.27

tau_p/tau_e 5

Plasma triangularity 0.6

• Divertor is He-cooled since heat flux was routinely > 5 MW/m^2 and liquid-metal cannot provide adequate cooling.

• SiC blanket is use.• All costing is 2009$

NOTES:

24

Filtering the data

SiC blanket Value

Pnelec 1000 ± 25 MW

Q_Divertor (in/outboard)

< 15, < 12.5, < 10, < 7.5 MW/m2

Bt max 6-18 T

H98 < 1.9 aggr, < 1.6 cons

n/nGr < 1

fBS < 1

Output is ~25k points To find strawmen:

apply additional filters - or -

visualize in VASST

25

ARIES-ACT-I possible aggr strawmen

* All costing is 2009$ ** H98 is based on total power including radiation

βN R (m) BT (T) n/nGr H98 ** fBS Paux (MW) COE (mills)*

ACT-I: SiC blanket / aggr physics

0.045 5.25 5.5 0.95 1.393 0.856 44.29 54.15

0.045 5.5 5.5 0.8 1.494 0.818 51.15 54.85

0.045 5.5 5.5 0.85 1.468 0.859 59.57 55.71

0.045 5.5 5.5 0.85 1.5 0.859 43.7 55.01

0.045 5.75 5.0 0.95 1.341 0.818 59.79 55.38

Q gain Qdivoutb (MW/m2)

Qdivinb (MW/m2)

Ip (MA) q95kappa Precir

(MWe)Pthermal (MWth)

Ave neut wall flux (MW/m2)

40 7.15 3.12 10.58 4.2 2.2 168.3 2028 2.84

35 7.14 3.07 11.64 4.0 2.2 181.1 2057 2.62

30 7.25 3.13 11.08 4.2 2.2 205.2 2061 2.61

40 6.64 2.88 11.08 4.2 2.2 166.4 2004 2.56

30 6.43 2.80 11.06 4.0 2.2 199.3 2073 2.41

26* All costing is 2009$ ** H98 is based on total power including radiation

Q gain Qdivoutb (MW/m2)

Qdivinb (MW/m2)

Ip (MA) q95kappa Precir

(MWe)Pthermal (MWth)

Ave neut wall flux (MW/m2)

15 7.24 2.93 13.2 5 2.0 349 2344 2.1

15 7.30 2.96 13.3 4.8 2.0 344 2332 2.08

16.5 7.0 2.85 12.8 5.1 2.0 327 2296 2.13

βN R (m) BT (T) n/nGr H98 ** fBS Paux (MW) COE (mills)*

ACT-II: SiC blanket / aggr physics

0.0275 6.75 7.5 0.85 1.211 0.632 131.1 63.02

0.0275 6.75 7.5 0.85 1.169 0.607 130.3 62.82

0.0287 6.63 7.56 0.867 1.277 0.673 120.1 62.5

Average values of ~20 points

ARIES-ACT-II possible cons strawmen

27

ARIES Tec hnology and Physics Assessment – Aggressive and Conservative Tokamaks (ACT) ACT-I: Aggressive technology (SiC blanket) and aggressive physics ARIES Systems Code Outputs V. 30 (SVN version control) Printed by LCC 3/29/11 Input data: Builds Costing Magnets Power Flow Output data: Engineering summary

Plasma parameters Ver tical build IB/OB builds Geometric data – volumes Geometric data – surface areas Liquid metal mass Material-based component costs

Powers Costing Accounts Costing Algorithms Part Compositions Cost Base Material Densities Unit Cost Inflation Factor 2D CAD drawing from systems code – PNG, TIF

http://aries.ucsd.edu/ARIES/WDOCS/ACT-I.htm

Full engineering analysis printouts available online

28

Radial build examples

ARIES-ACT-IR ~5.5m, a ~1.25m, NWL_ave

~2.4-2.8 MW/m2, Elongation = 2.2

ARIES-ACT-IIR ~6.75m, a ~1.69m, NWL_ave ~2.1 MW/m2, Elongation = 2.0

29

Effect of filtering Qdivoutb < 15, 10, 7.5 MW/m2

βN R (m) BT (T) n/nGr H98 ** fBS Paux (MW) COE (mills)*

Qdivoutb < 15 MW/m2

0.046 4.88 5.73 0.903 1.38 0.854 52.07 53.98

Qdivoutb < 10 MW/m2

0.0425 4.96 6.34 0.881 1.43 0.868 49.62 54.37

Qdivoutb < 7.5 MW/m2

0.045 5.5 5.67 0.871 1.46 0.848 51.74 55.1

All average values

Q gain Qdivoutb (MW/m2)

Qdivinb (MW/m2)

Ip (MA) q95kappa Precir

(MWe)Pthermal (MWth)

Ave neut wall flux (MW/m2)

Qdivoutb < 15 MW/m2

35.8 9.5 4.1 10.5 4.1 2.2 197 2094 3.40

Qdivoutb < 10 MW/m2

36.9 8.7 3.8 10.7 4.5 2.2 187 2071 3.26

Qdivoutb < 7.5 MW/m2

35.3 6.9 3.0 11.2 4.2 2.2 185 2054 2.63

30

High betaN cases at A < 4, low COE

R vs Qdivoutb, CC A

R vs Qdivoutb, CC COE R vs Qdivoutb, CC BetaN

31

High betaN cases lower Bt

BetaN vs Bt, CC COE

32

Higher fGW allows lower H98

33

R vs COE, CC: Asp, Bt

Database name: ACT-I (aggr phys & aggr tech)

Filters: Bt 6-18 TQdiv (in, out) < 7.5 MW/m2

Pnelec = 1000 ± 15 MWn/nGr < 1H98 < 1.9

Smallest machines have low COE, A < 4,

low Bt

34

Qdivoub vs COE, CC: R

Database name: ACT-I (aggr phys & aggr tech)

Filters: Bt 6-18 TQdiv (in, out) < 7.5 MW/m2

Pnelec = 1000 ± 15 MWn/nGr < 1H98 < 1.9

35

VASST GUI v.7(Visual ARIES Systems Scanning Tool)

NEW multi-filtering functionality

36

Screen sharing for VASST demo

• Propose use of Skype or iChat screen sharing feature for

personalized VASST demo on your own computer• Simply need a free account.

37

Summary & Future Work

Multiple errors corrected and modifications implemented

from feedback, presentations, meeting actions items, interim

printouts comments.

Revision locked at # 30 (SVN).

Scans of aggressive and conservative physics, including

asp scans, were run and visualized.

Choose strawmen points then issue ACT-I, II detailed

engineering analysis for SiC blanket. Once DCLL module is converted with generic build

structure, issue ACT-III, IV.