EVOLVE ConfigurationEVOLVE ConfigurationEVOLVE ConfigurationEVOLVE Configuration

S. Malang, I. Sviatoslovsky, B. Merrill, P. Fogarty

Presented by B. Nelson

13th APEX meeting November 15-17, 2000

SNL, Albuquerque

• Most effort expended in FY99

• FY-00 work included:– Report figures and new flow schematic provided in FY-00– Tradeoff study of tube/tray/FW configuration

• Primary emphasis on boiling tray design, lessemphasis on transpiration cooled design

Status of configuration studies Status of configuration studies Status of configuration studies Status of configuration studies

EVOLVE ConfigurationEVOLVE ConfigurationEVOLVE ConfigurationEVOLVE Configuration

Power– Average neutron wall load: 10 MW/m2

– Average first wall load: 2 MW/m2

Coolant– Li liquid temperature 900 - 1100 C– Li vapor temperature 1200 C– Li pressure <0.5 atm

Materials– FW material Tungsten– Tube, tray, structure material Tungsten– Condensor material, tubes Niobium

Configuration– First Wall Nested tubes, toroidal flow– Blanket / Shield Horizontal trays, vertical flow

EVOLVE Baseline conceptEVOLVE Baseline conceptEVOLVE Baseline conceptEVOLVE Baseline concept

Outboard plan schematic of moduleOutboard plan schematic of moduleOutboard plan schematic of moduleOutboard plan schematic of module

Note: Some details have changed

*From FY-99 APEX design report

Inboard Outboard

FW 5 cm 5 cm

Li tray 40 cm 50 cm

Back wall of tray 0.5 cm 0.5 cm

Li vapor manifold 15 cm 20 cm

Manifold backplate 1 cm 1 cm

Clearance 2 cm 2 cm

Secondary blanket 0 cm 40 cm

Clearance 0 cm 2 cm

Shield 60 cm 50 cm

Clearance 2 cm 2 cm

VV front sheet 5 cm 5 cm

VV shielding zone 30 cm 30 cm

VV rear sheet 5 cm 5 cm

Total 165.5 cm 212.5 cm

Recommended radial build*Recommended radial build*Recommended radial build*Recommended radial build*

Outboard ModuleOutboard ModuleOutboard ModuleOutboard Module

Flow / Temperature SchematicFlow / Temperature SchematicFlow / Temperature SchematicFlow / Temperature SchematicWith multiple natural convection loops

for passive heat removal

Cycle efficiency 57.7%

Integrated FW / tray design

Separated FW / tray design

FW / tray design

Sector maintenance conceptSector maintenance conceptSector maintenance conceptSector maintenance concept

Blanket

Stream FormingNozzles

Plasma X-Point

FirstWall

Blanket

VacuumPump

LiquidLi Stream

Liquid StreamCollectors

Li Supply Lines

Side View Cutaway of Divertor Cassette

Divertor Cassette ConceptDivertor Cassette ConceptDivertor Cassette ConceptDivertor Cassette Concept

3-D View of Divertor Cassette

Divertor Cassette ConceptDivertor Cassette ConceptDivertor Cassette ConceptDivertor Cassette Concept

Desirable design featuresDesirable design featuresDesirable design featuresDesirable design features

• Low pressure, low primary stress structure (not includingdisruption loads)

• Nearly uniform temperature structure

• Low velocity lithium liquid (~1 m/s)

• Small leaks may not be fatal to plasma operation

• Small heat exchangers, integral with blanket shield system, allrefractory piping is inside plasma chamber

• Two-pronged maintenance approach:

- High maintenance items are contained in cassettes (diagnostics, divertor, heating systems) - Everything else in sector module is replaced as a unit

• Vapor formation and motion in magnetic field

• Fabrication of large tungsten structures

• Disruption loads

• Safety, LOCA

Configuration IssuesConfiguration IssuesConfiguration IssuesConfiguration Issues

PlanPlanPlanPlan

Depending on resource allocations,

• Proceed with second iteration of mechanical design, including CAD models– Tray supply / circulation concept, vapor manifold configuration– Integration of divertor, diagnostic, and midplane maintenance cassettes– Integration of heat exchangers

• Examine fabrication techniques for large tungsten structures

• Assist with development of alternative concepts, or adaptation to otherreactor configurations