Japan considerations on design and qualification of PFC's for near term machines (ITER) Satoshi Suzuki 1, Satoshi Konishi 2 1 Japan Atomic Energy Agency 2 Kyoto University

Contents Development / provisional procurement activity of the ITER divertor outer vertical target Development / provisional procurement activity of the ITER divertor outer vertical target Small divertor mock-ups Small divertor mock-ups Non-destructive examination by using infrared thermography Non-destructive examination by using infrared thermography Development of the first wall of the ITER test blanket module (TBM) Development of the first wall of the ITER test blanket module (TBM) Provisional high heat flux test of the full-poloidal length TBM first wall mock-up Provisional high heat flux test of the full-poloidal length TBM first wall mock-up Development of the DEMO divertor Development of the DEMO divertor Small divertor mock-ups made of ferritic steel with tungsten armor Small divertor mock-ups made of ferritic steel with tungsten armor

Development / provisional procurement activity of the ITER divertor outer vertical target Development / provisional procurement activity of the ITER divertor outer vertical target Small divertor mock-ups Small divertor mock-ups Non-destructive examination by using infrared thermography Non-destructive examination by using infrared thermography Development of the first wall of the ITER test blanket module (TBM) Development of the first wall of the ITER test blanket module (TBM) Provisional high heat flux test of the full-poloidal length TBM first wall mock-up Provisional high heat flux test of the full-poloidal length TBM first wall mock-up Development of the DEMO divertor Development of the DEMO divertor Small divertor mock-ups made of ferritic steel with tungsten armor Small divertor mock-ups made of ferritic steel with tungsten armorContents

ITER Plasma Facing Components Among the divertor high heat flux components, JAEA is going to procure all of the outer vertical target Among the divertor high heat flux components, JAEA is going to procure all of the outer vertical target 22 plasma facing units / 1 cassette 22 plasma facing units / 1 cassette 54 cassettes + 6 spares 54 cassettes + 6 spares --> 1320 plasma facing units Outer vertical target (JA) Inner vertical target (EU) Dome(RF) Cassette body (EU) Cross sectional view of ITER ITER divertor

Outer vertical target Design heat flux Design heat flux Tungsten part : 5MW/m 2 Tungsten part : 5MW/m 2 CFC (Carbon Fiber Composite) part : MW/m 2 CFC (Carbon Fiber Composite) part : MW/m 2 Coolant condition Coolant condition Water, 4MPa, 100 o C Water, 4MPa, 100 o C Swirl flow by twisted tape (CFC part) Swirl flow by twisted tape (CFC part) Bonding of armor materials Bonding of armor materials Braze Braze HIP (Hot Isostatic Pressing) HIP (Hot Isostatic Pressing) Prior to the procurement of the vertical target components, the manufacturing process and the thermal performance of the components should be validated/demonstrated by using small mock-ups. ("Prequalification" activity) Prior to the procurement of the vertical target components, the manufacturing process and the thermal performance of the components should be validated/demonstrated by using small mock-ups. ("Prequalification" activity) Outer vertical target (1 cassette) with "Monoblock" geometry

Optimization of the manufacturing process by using small mock-ups Armor : CFC (CX-2002U) Armor : CFC (CX-2002U) Tube : CuCrZr Tube : CuCrZr Bonding : Brazing (T braze =980 o C) Bonding : Brazing (T braze =980 o C) Ni-Cu-Mn Ni-Cu-Mn Ti-Cu-Ni Ti-Cu-Ni Metalizing of CFC Metalizing of CFC Present : Ti-Cu (5 - 10%-Ti) Present : Ti-Cu (5 - 10%-Ti) Accuracy of machining of CFC hole Accuracy of machining of CFC hole +/- 5 microns to the target value +/- 5 microns to the target value High heat flux test has been performed to check the soundness of the braze interface and to demonstrate the thermal performance. High heat flux test has been performed to check the soundness of the braze interface and to demonstrate the thermal performance. A small vertical target mock-up simulating the CFC part of the vertical target

High heat flux test of the small mock-ups and fabrication of a qualification prototype Braze filler : Ni-Cu-Mn (980 o C x 0.5h, followed by Ar gas quench) Braze filler : Ni-Cu-Mn (980 o C x 0.5h, followed by Ar gas quench) Metalizing : Present (Ti-Cu, %-Ti) Metalizing : Present (Ti-Cu, %-Ti) Aging : 475 o C x 2h Aging : 475 o C x 2h Finally, the mock-up fabricated by using parameters above could withstand the heat flux of 20MW/m 2 for 1000 cycles. Finally, the mock-up fabricated by using parameters above could withstand the heat flux of 20MW/m 2 for 1000 cycles. at 5 MW/m 2 (EB heating) ~500mm CFC Tungsten ITER vertical target Qualification Prototype Based on the successful result of the small mock-ups, a medium scale mock-up (Qualification Prototype) has been manufactured. Based on the successful result of the small mock-ups, a medium scale mock-up (Qualification Prototype) has been manufactured. This mock-up includes most of the critical technical issues (bonding of CFC/Cu, curved cooling tube, etc...) on the fabrication of the ITER divertor vertical target. This mock-up will be high heat flux tested in Efremov institute in This mock-up includes most of the critical technical issues (bonding of CFC/Cu, curved cooling tube, etc...) on the fabrication of the ITER divertor vertical target. This mock-up will be high heat flux tested in Efremov institute in 2008.

High heat flux test of the small mock-ups and fabrication of a qualification prototype Braze filler : Ni-Cu-Mn (980 o C x 0.5h, followed by Ar gas quench) Braze filler : Ni-Cu-Mn (980 o C x 0.5h, followed by Ar gas quench) Metalizing : Present (Ti-Cu, %-Ti) Metalizing : Present (Ti-Cu, %-Ti) Aging : 475 o C x 2h Aging : 475 o C x 2h Finally, the mock-up fabricated by using parameters above could withstand the heat flux of 20MW/m 2 for 1000 cycles. Finally, the mock-up fabricated by using parameters above could withstand the heat flux of 20MW/m 2 for 1000 cycles. at 5 MW/m 2 (EB heating) ~500mm CFC Tungsten ITER vertical target Qualification Prototype The high heat flux test of the first mock-up (VTQP-1) has been completed in November, This mock-up has successfully withstood the heat flux requirements as follows; The high heat flux test of the first mock-up (VTQP-1) has been completed in November, This mock-up has successfully withstood the heat flux requirements as follows; CFC : 10MW/m 2 x MW/m 2 x 1000cycles CFC : 10MW/m 2 x MW/m 2 x 1000cycles W : 3MW/m 2 x MW/m 2 x 1000 cycles W : 3MW/m 2 x MW/m 2 x 1000 cycles Based on this, Japan Domestic Agency (JADA) has been qualified to proceed the subsequent divertor procurement. Based on this, Japan Domestic Agency (JADA) has been qualified to proceed the subsequent divertor procurement.

Development of a new NDE facility "FIND" (Facility of Infrared Non-destructive examination for Divertor) In parallel to the optimization of the manufacturing process, acceptance test methods have also been provided. In parallel to the optimization of the manufacturing process, acceptance test methods have also been provided. In addition to the conventional methods (UT, RT, He leak testing for the braze/weld joint), infrared thermography examination is essential for the non-destructive examination of the vertical target. In addition to the conventional methods (UT, RT, He leak testing for the braze/weld joint), infrared thermography examination is essential for the non-destructive examination of the vertical target. UT can detect the interfacial defects between CuCrZr tube and soft copper interlayer. CFC (porous) UT sensor Internal defect of CFC or interfacial defect between CFC and soft copper can not be detected by UT. CFC (porous)

Development of a new NDE facility "FIND" (Facility of Infrared Non-destructive examination for Divertor)

By monitoring of the thermal transient of the mock-ups due to switching of the hot/cold water, internal defect of the CFC or interfacial defect of the CFC/Cu joint can be detected. By monitoring of the thermal transient of the mock-ups due to switching of the hot/cold water, internal defect of the CFC or interfacial defect of the CFC/Cu joint can be detected. Time-to-time differential of the thermal transient between defected and non-defected mock-ups gives quantitative evaluation of the defect size and the location with the help of FEM analysis. Time-to-time differential of the thermal transient between defected and non-defected mock-ups gives quantitative evaluation of the defect size and the location with the help of FEM analysis.

Development / provisional procurement activity of the ITER divertor outer vertical target Development / provisional procurement activity of the ITER divertor outer vertical target Small divertor mock-ups Small divertor mock-ups Non-destructive examination by using infrared thermography Non-destructive examination by using infrared thermography Development of the first wall of the ITER test blanket module (TBM) Development of the first wall of the ITER test blanket module (TBM) Provisional high heat flux test of the full-poloidal length TBM first wall mock-up Provisional high heat flux test of the full-poloidal length TBM first wall mock-up Development of the DEMO divertor Development of the DEMO divertor Small divertor mock-ups made of ferritic steel with tungsten armor Small divertor mock-ups made of ferritic steel with tungsten armorContents

ITER TBM Test Program ITER TBM Program is to test the necessary functions of DEMO Blanket in the real fusion environment with test module scalable to DEMO blanket. ITER TBM Program is to test the necessary functions of DEMO Blanket in the real fusion environment with test module scalable to DEMO blanket. Demonstration of production of fusion fuel tritium Demonstration of production of fusion fuel tritium Demonstration of extraction of energy Demonstration of extraction of energy Demonstration of shielding performance Demonstration of shielding performance ITER TBM Test Program is one of the most important development step. ITER TBM Test Program is one of the most important development step. Based on the results from the basic R&Ds on material testing and fabrication trial, near-full-scale mock- up has successfully been developed. Based on the results from the basic R&Ds on material testing and fabrication trial, near-full-scale mock- up has successfully been developed. Cross sectional view of ITER

Full poloidal length TBM first wall (FW) mock-up Fabricated FW mockup Cross Section ~18cm 8mm 10 microns front plate rectangular tube 1500mm L x 176mm W 250mm 1500mm WCSB TBM (a sub-module) FW （ F82H) Overall view of the TBM-FW mockup with coolant manifolds front plate - HIP condition ： 1100ºC, 150MPa, 2h - 15 rectangular coolant channels

High heat flux test In ~0.5MW/m 2, 30sec, 80 cycles of heat load, hot spot due to bond defect was not observed. Expected heat removal performance was demonstrated. HHF Test Condition Heat Flux: 0.5 MW/m 2 Beam Pulse: 30 s Coolant Inlet P. ： 15 MPa Coolant Inlet T.: 280 o C Flow velocity: 2 m/s H + Ion Beam TBM FW Mockup Infrared camera Image Preliminary high heat flux test of the TBM-FW mockup has been carried out under high temperature pressurized coolant condition. Further thermal cycling test of this mockup is planned in this year.

Development / provisional procurement activity of the ITER divertor outer vertical target Development / provisional procurement activity of the ITER divertor outer vertical target Small divertor mock-ups Small divertor mock-ups Non-destructive examination by using infrared thermography Non-destructive examination by using infrared thermography Development of the first wall of the ITER test blanket module (TBM) Development of the first wall of the ITER test blanket module (TBM) Provisional high heat flux test of the full-poloidal length TBM first wall mock-up Provisional high heat flux test of the full-poloidal length TBM first wall mock-up Development of the DEMO divertor Development of the DEMO divertor Small divertor mock-ups made of ferritic steel with monoblock tungsten armor Small divertor mock-ups made of ferritic steel with monoblock tungsten armorContents

Small divertor mock-up for DEMO application As a basic R&D to achieve DEMO divertor, a small mock-up made of F82H with monoblock tungsten armor has been fabricated by using HIP bonding technique. As a basic R&D to achieve DEMO divertor, a small mock-up made of F82H with monoblock tungsten armor has been fabricated by using HIP bonding technique. at 5 MW/m 2 (EB heating) The central two tungsten lamellae were overheated due to the delamination of the HIP bonded interface. Further improvements of the HIP bonding condition for the F82H and tungsten joint are essential. High heat flux test o C x 150MPa x 2h 750 o C x 1.5h

Summary R&D activities on the PFCs for ITER and DEMO reactor have extensively been performed in JAEA. R&D activities on the PFCs for ITER and DEMO reactor have extensively been performed in JAEA. For the ITER divertor components, the braze bonding technique has been optimized. The ITER divertor qualification prototype has successfully been fabricated and soon be high heat flux tested in Efremov institute. For the ITER divertor components, the braze bonding technique has been optimized. The ITER divertor qualification prototype has successfully been fabricated and soon be high heat flux tested in Efremov institute. In addition, the thermal performance of the TBM first wall with full poloidal length have successfully been demonstrated, and also the soundness of the HIP joint of F82H was demonstrated. In addition, the thermal performance of the TBM first wall with full poloidal length have successfully been demonstrated, and also the soundness of the HIP joint of F82H was demonstrated. On the other hand, the HIP bonding condition for the tungsten and F82H joint should be investigated and improved as a bonding method for the DEMO divertor. On the other hand, the HIP bonding condition for the tungsten and F82H joint should be investigated and improved as a bonding method for the DEMO divertor. Further development of the bonding technique should be necessary to realize the DEMO divertor. The development of the structural material (F82H) will be continued, in parallel to the development of the TBM components. Further development of the bonding technique should be necessary to realize the DEMO divertor. The development of the structural material (F82H) will be continued, in parallel to the development of the TBM components.