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Need for Damage Resistant Blanket and First Wall

By Margaret Reed,2014-02-10 03:02
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Need for Damage Resistant Blanket and First Wall

    Need for Damage Resistant Blanket and First Wall

; Goals for First Wall and Blanket design include:

- High power density

    - High tritium breeding ratio

    - High temperature for good power conversion efficiency - High availability (tolerant of some failures, long life, quick repair times, etc. )

    - Low activation

    ; Conventional designs using solid walls do not presently meet all goals

- Power density too low or

    - Walls too thin or

    - Refractory materials are not low activation

”Bag” concept with thin liquid layer addresses most issues

First Wall:

     Thin layer of fast moving Flibe (~ 2cm thick at 10 m/s)

     Temperature ~ 450C to minimize vapor pressure

Blanket

     Thick zone of slower moving Flibe

     Flibe contained in flexible structure woven from SiC fibers (“bags”)

     Temperature ~ 600C, with multiple zones for better flow control

     Bags fed from bottom

     Any hot liquid that leaks from bag is cooled by fast liquid layer

     Extra beryllium included in first 10 cm of bag to improve breeding

    SiC “bag” is damage resistant and low activation

    ; Bag is woven from SiC fibers

    - Structure remains flexible, even

    though material is very brittle - No or very minimal thermal stress - SiC fabric is commercially

    available

    ; Small leaks from bag should not be

    a fatal problem, since vapor

    pressure is suppressed by cooler

    flow over surface

    Original “Bag” layout illustrating key features

    Film former

    Divertor

    Cassette

The blanket piping fits at about 5 m/s flow velocity in pipes

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