1. NSTX NSTX Center Stack Upgrade Ensure fatigue resistant Welds: minimum # of locations shown, could be more. Various Weld Reinforcements & Hardware Replacement Hardware replaced on pf2 clamps Hardware replaced on pf3 clamps Pf2 mount Pf3 mount Umbrella foot mount Weld reinforcement required for pf3 mount Weld reinforcement for umbrella mount (front and back) Weld reinforcement for (2) dome rib tabs.

2. NSTX NSTX Center Stack Upgrade VV Support Legs: Foot Reinforcement Epoxy anchor bolted to the floor.

3. NSTX NSTX Center Stack Upgrade VV Support Legs Modified Existing VV Leg Support Plates added to side form box beam. Welds need capacity to match upgrade loads. As-built welds need to match analysis. Most likely, welds need to be reinforced. Create cut out to provide clearance for TFOL connecting rod. Add reinforcing gussets.

4. NSTX NSTX Center Stack Upgrade Pedestal Upgrade 4 Base Plate Lower Pedestal Section Upper Pedestal Section Remove and Replace Pedestal

5. NSTX NSTX Center Stack Upgrade Umbrella Reinforcements 1 & 2 5 Welded Bolted Reinforcement

6. NSTX NSTX Center Stack Upgrade Upper Umbrella Lid 6 New Upper Lid (1 water jet part) For installation, Upper Lid Reinforcement Ring is sectional. Upper Lid bolts to ring. Welded Reinforcement Rings and gussets.

7. NSTX NSTX Center Stack Upgrade Lower Umbrella Lid 7 New Lower Lid (sectional & bolted) Lower lid and Pedestal attachment (bolted) 1 water jet part welded bolted

8. NSTX NSTX Center Stack Upgrade Umbrella Upgrades 8 Replacement Leg (1 machined part) Upper & Lower Umbrella Legs removed and replaced (welded). Replace foot hardware, capture and slide with Inconel parts. Arch Reinforcement Ring (sectional & welded)

9. NSTX NSTX Center Stack Upgrade New (additional) PF4/5 Supports Modified Existing PF4/5 Supports PF4/5 Support

10. NSTX NSTX Center Stack Upgrade New PF4/5 Support 10 New (additional) PF4/5 Support

11. NSTX NSTX Center Stack Upgrade Replace Hardware with ASTM A193 B8M Class2 Material Remove Clevis Replace Column Modifications to Existing PF4/5 Support

12. NSTX NSTX Center Stack Upgrade TF Outer Leg Support Upgrades 12 Remove and replace clevis. Remove and replace existing TFO Leg support turnbuckles. Remove and replace connecting rods. welded Shimmed around existing TFO leg clamp.

13. NSTX NSTX Center Stack Upgrade TF Outer Leg Support Upgrades 13 In718 bushing In718 rod end housing Spherical bearing In718 pipe TFOL Weldment TFOL Weldment Joint TFOL Weldment Clevis (x2) VV Clevis

14. NSTX NSTX Center Stack Upgrade Additional Parts/Upgrade Components Additional pf2 clamps Torque Plate 1Torque Plate 2

15. NSTX NSTX Center Stack Upgrade Installation Layout 15 Bus Tower Pedestal OH Bus CHI Ring Bus TF Bus Upper PF1 Bus Lower PF1 Bus

16. NSTX NSTX Center Stack Upgrade CHI Ring Bus 16 G10 spacer Support/mount Clamp Water cooled.

17. NSTX NSTX Center Stack Upgrade PF 1a, b, c Bus 17 Support/mount Clamp Upper PF1 Bus Runs Bus Tower

18. NSTX NSTX Center Stack Upgrade PF 1a, b, c Bus 18 Clamp Lower PF1 Bus Runs Bus Tower

19. NSTX NSTX Center Stack Upgrade OH Coaxial Bus 19 G10 spacer Support/mount Water cooled rectangular bus section. Air cooled Coaxial Bus section. Connection to OH coil.

20. NSTX NSTX Center Stack Upgrade TF Bus 20 G10 spacer Support/mount Water cooled section. Bus Tower Support/mount G10 spacer