Frame design Status

TB-SWG30-31 May 2005

Presented by K. IokiPrepared by M. Morimoto

VV and Blanket Division, ITER Garching

ITER

Definitions of names for “Frame”

First Walls

TBM

TBM

Flexible supports

Keys

Electrical Strap

BoxBox(Partition)

Backside ShieldsStainless 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

Frame Thickness and Nuclear Shielding Efficiency- Nuclear analysis for different thickness of the frame box structure -

Result: The maximum nuclear heating rate: 0.075 , 0.097 and 0.17 MW/m3 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

TBMBox walls(10cm case)

BacksideShield

distance

TBM: 20% Eurofer97 + 50% PbLi + 30% Helium,Reference port plug: 60% SS316L(N)IG + 20% Water + 20 % Void

Analysis model for vertical type of the frame with TBM

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

TBMBox walls(10cm case)

BacksideShield

distance

Analysis model for vertical type of the frame with TBM

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

Replacement methods of TBM

D.. Front Access with bore toolD.. Front Access with bore tool

Cutting/re-welding (with hands-on in the port cell)

C.. Side Access with side hatchC.. 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 toolA. 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)

Cutting/re-welding (with bore tool (RH) in the hot cell)

B. Back Access without bore toolB. Back Access without bore tool

Cutting/re-welding (with hands-on in the port cell)

Chamber(To be replaced with TBM)

Comparison of the replacing methodsReplacement 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 andPipe 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 number Limited number of the pipes acceptable

The number of pipes depends on the TBM design.

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

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

An example of possible pipe layout forTBM 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

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

ITER

SummaryThe 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.