1. US ITER TBM DCLL TBM Design, Analysis and Development C. Wong, M. Dagher, S. Smolentsev and S. Malang FNS/TBM Meeting UCLA, September 19-20, 2007

2. US ITER TBM Objectives: A design that has minimum credibility issues, mainly on configuration and fabrication, with design flexibility and support from MHD analysis A design should be suitable for the DEMO application A design that is simple enough and the design team members feel comfortable with A design approach that can aid IO’s goal of ancillary equipment standardization but not given up our DCLL design features and objectives A design flexible enough to accommodate the look-a-like and act-a-like approaches via the use of sub-modules Base-line DCLL design

3. US ITER TBM DCLL presented at TBWG-18

4. US ITER TBM PbLi Inlet Manifold PbLi Outlet Manifold PbLi Inlet Flow Channel PbLi Outlet Flow Channel DCLL TBM Design Pb-Li Flow Channels

5. US ITER TBM Helium Flow Circuit START: Into 1 st Pass (Includes Bottom Plate) From 1 st Pass Second Pass From Third Pass Fourth Pass From Fourth Pass Fifth Pass From Fifth Pass Sixth Pass From Sixth Pass Seventh Pass From Seventh Pass To Top Plate Top Plate Grid Plates Divider Plates Back Plate FW pass 1 FW pass 2 Bottom Plate He out He in FW He circuit 1TBM He circuit Third Pass From Second Pass

6. US ITER TBM Top Plate He Flow Channels Flow path: circuit 1, pass 7, channels 1-3 (of 4 total) Flow path: circuit 1, pass 7, channel 4 (of 4 total) Flow path: circuit 2, pass 7, channels 1-4 (of 4 total) NOTICE THE COUNTERFLOW OF THE HELIUM CIRCUITS He Flow Into Grid Plate I am very un-easy with this top plate design and fabrication, which will have to handle all the He coolant and properly distribute the coolant through separation and grid plates. It will be more difficult for DEMO and it could create void space.

7. US ITER TBM Possible modifications for the base-line DCLL 1.Review PbLi routing to minimize power loss to colder Helium streams, decoupled impact from FCI 2.To accommodate IO standardization direction change concentric PbLi pipes to two separate inlet and outlet pipes 3.Review helium routing scheme to the separation and grid plates 4.Intention of applying second backplate to accommodate act-a-like tests and sub-modules

8. US ITER TBM Item 1. PbLi routing to minimize power loss to colder Helium streams, decoupling impacts from FCI 2 nd estimate by Sergey’s modeling: In terms of heat leakage into He, the case 2: Down up up option has advantages over the Case 1: up down down scheme. DEMO energy loss: 1 st estimate by Wong: With Q’’’ input and looked at T differences between channels: Case x: Front/middle/back channels Case 1: Up down down…531 Case 2: Down up up…….319 Case 3: Up down Up…….520 Case 4: Up up down…….572 Case 5: Up down up…….285 no leakage in zone 2 Case 2 seems to have lower leakage Recommendation: To assess the following in coordination with the coordination with the FCI design 1. For TBM change the PbLi to back-up front-down configuration. 2. But to avoid counter flow at the front wall, go back-down and front up configuration. Implying re-location of the PbLi inlet outlet pipes to the top TBM Ref as of April 2007 TBM Base-line Sept 2007 PbLi In and out at bottom PbLi In and out at top DCLL DEMO FW He should still be moving from bottom to Top.

9. US ITER TBM Item 2. We may or may not evolve our design similar to the HCLL back plate design, but with separate inlet and outlet PbLi pipes design would be easier to adjust than the concentric pipes design for IO connection standardization. With the second back plate design we can test concentric pipes in future test modules. HCLL Back plate design

10. US ITER TBM Item 3: Should we consider radial flow in the radial plate, and use the separation plate as helium plenum?

11. US ITER TBM HCLL TBM Design: Updated geometry

12. US ITER TBM

14. We will keep the first wall helium cooling configuration and Mo and Ed will assess the possibility of radial flow to cool the radial and separation plates similar to the EU HCLL approach

15. US ITER TBM Item 4: Second back plate First back plate 1 We could add second back plate to adjust to our specific tests for future modules. There is room here to move the shield back to accommodate a scond back plate.

16. US ITER TBM Possibility of adding a second back plate

17. US ITER TBM Possibility of adding a second back plate

18. US ITER TBM Proposed Modifications for base-line DCLL TBM 1.PbLi flow back down front up with coordination with FCI design 2.Replace concentric PbLi pipes with two inlet and outlet pipes 3.Utilize radial flow in radial plates and use separation plate as plenum 4.Consider the possibility of 2 nd back plate option to be implemented in the future* *The 2 nd back plate mostly likely will need to be fabricated from non-ferromagnetic material, and the amount of RAFM piping should also Be checked. We need to check the possible need of reducing the PbLi Tout<420 C when the compatibility of PbLi/SS becomes important. As the design evolves, design details should include improved FCI design, minimum impacts from PbLi reversed flow and meeting of material compatibility limits with minimum amount of RAFM steel