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Frame design Status TB-SWG 30-31 May 2005 Presented by K. Ioki Prepared by M. Morimoto VV and Blanket Division, ITER Garching ITER.

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Presentation on theme: "Frame design Status TB-SWG 30-31 May 2005 Presented by K. Ioki Prepared by M. Morimoto VV and Blanket Division, ITER Garching ITER."— Presentation transcript:

1 Frame design Status TB-SWG May 2005 Presented by K. Ioki Prepared by M. Morimoto VV and Blanket Division, ITER Garching ITER

2 Definitions of names for “Frame” First Walls TBM Flexible supports Keys Electrical Strap Box (Partition) Backside Shields Stainless Steel Cross sectional view of the First Wall on the frame 200 First wall structure Port plug = Frame + TBMs Frame=FW structure + Box structure + Backside shields

3 Frame Thickness and Nuclear Shielding Efficiency - Nuclear analysis for different thickness of the frame box structure - Result: The maximum nuclear heating rate: 0.075, and 0.17 MW/m 3 for the reference plug, 20cm and 10cm thick frame cases, respectively. 20 cm thick frame can achieve the similar level of nuclear shielding efficiency as the reference port plug case. Nuclear Heating Rate in the VV port TBM Box walls (10cm case) Backside Shield distance TBM: 20% Eurofer % PbLi + 30% Helium, Reference port plug: 60% SS316L(N)IG + 20% Water + 20 % Void Analysis model for vertical type of the frame with TBM

4 Frame Thickness 200 mm - Flexibility of operation - The main reason of 20 cm frame thickness is “effect of ferromagnetic materials on the plasma performance”. In addition; nuclear shielding efficiency is also important. Even in case when installation of one of TBMs or sub-modules is unexpectedly cancelled, ITER can start the operation with 20 cm thick frame. Increase flexibility of the operation. Can we prepare “dammy plug(s) or dammy TBM”? Nuclear Heating Rate in the VV port TBM Box walls (10cm case) Backside Shield distance Analysis model for vertical type of the frame with TBM

5 TBM support and attachments TBM is supported from the backside shields with flexible supports and keys. (Similar to the support of the shield blanket, which has been demonstrated through R&D during EDA.) An electrical strap is equipped at the centre area of the TBM to reduce electromagnetic force on the pipes. Key Flexible support Electrical Strap Key Flexible support Electrical Strap

6 Replacement methods of TBM D.. Front Access with bore tool Cutting/re-welding (with hands-on in the port cell) C.. Side Access with side hatch Cutting/re-welding (with hands-on in the port cell) Hatch (To be opened with RH in the hot cell. Including cutting/re-welding of water pipes) Cutting/re-welding (with RH in the hot cell) A. Back Access with bore tool A. Back Access with bore tool (reference ) Cutting/re-welding (with hands-on in the port cell) Cutting/re-welding (with bore tool (RH) in the hot cell) B. Back Access without bore tool Cutting/re-welding (with hands-on in the port cell) Chamber (To be replaced with TBM)

7 Comparison of the replacing methods Replacement method A. Back Access with bore tool (reference) B. Back Access without bore tool C. Side Access with hatch D. Front Access with bore tool Frame“Chamber“ is required at the back.. Removal parts “hatch” with cooling pipes are required. RH operation and Pipe welding/cutting Hand-on assisted RH is possible from the back- side. Need to establish reliability of the bore-tool welding/ cutting. (Good alignment for many pipe joints and guide structures for self- adjustment of pipes). Hand-on assisted RH is possible from the back-side. Handling of the many “chambers” including pipes is required. (Good alignment for many “chambers”) Welding/cutting at many locations. Accessibility to some of the pipes from the “side” is very limited. Opening/closing operation of "hatch" on the frame is required. Impact on the current TBM design (Pipe layout) Front access penetrations for pipe cutting/re- welding in the TBM are required. Possible number of pipes Limited numberLimited number of the pipes acceptable The number of pipes depends on the TBM design.

8 An example of possible pipe layout with Concept A From plasma side viewFrom port cell side view Keys TBM region (vertical type) Flexible supports 35 mm O.D. pipe Flange (interface with bellows) 65 mm O.D. pipe with bend 85 mm O.D. pipe with bend Flange (interface with bellows) Closure plate for flexible support Pipe layout is to be determined reflecting each design of TBM. Electrical Connection 2 x 85 mm pipes + 2 x 65 mm pipes + more than 13 x 35 mm pipes maybe able to be allocated

9 An example of possible pipe layout with Concept B From plasma side viewFrom port cell side view Keys TBM region (vertical type) Flexible supports 35 mm O.D. pipe Flange (interface with bellows) Chamber 65 mm O.D. pipe with bend 85 mm O.D. pipe with bend Chamber Flange (interface with bellows) Closure plate for flexible support Pipe layout is to be determined reflecting each design of TBM. Electrical Connection 1 x 85 mm pipes + 2 x 65 mm pipes + about 11 x 35 mm pipes maybe able to be allocated

10 An example of possible pipe layout for TBM sub-modules with bore tool (Concept A) From plasma side viewFrom port cell side view Keys TBM region (vertical type) Flexible supports 35 mm O.D. pipe Flange (interface with bellows) 65 mm O.D. pipe with bend Flange (interface with bellows) Closure plate for flexible support Pipe layout is to be determined reflecting each design of TBM. Electrical Connection 1 x 65 mm pipes + 7 x 35 mm pipes maybe able to be allocated for each TBM There is no space for chamber in this case

11 ITER Summary The Test Blanket Frame design is to be continued. More detail design is planned to be performed. Regarding “design code” and QA/NDT criteria, future activities are expected in couple with preparation for the shield blanket TSD and acceptance criteria.


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