the development of w/cu-pfc s for east upper divertor

ASIPP

The development of W/Cu-PFCs for EAST upper divertor

• Qiang Lia, Wanjing Wanga, Guangnan Luoa

• Singui Qinb, Guohui Liub

aEngineering Gr., FRM Division, ASIPPbAdvanced Technology and Materials Co., Ltd

ASIPP

Outline

• Tungsten divertor for EAST

• Manufacturing of W/Cu-PFUs

• Qualification of PFCs

• Commissioning

• Improvement and repairing

• Summary

10/7/15 2IAEA TMSSO-8, Nara, 26-29 May, 2015

ASIPP

Outline




• Commissioning


• Summary


ASIPP

Motivation of W/Cu divertor on EAST

10/7/15 IAEA TMSSO-8, Nara, 26-29 May, 2015

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Divertor

EAST goal: long-pulse high performance plasma operation

Total input power~34MW

ASIPP

PFCs design

• 15000 Monoblocks

• 720 Monoblock PFUs

• 240 Flat type PFUs


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Dual chamfering for EAST

80 Cassette Bodies

ASIPP

Outline




• Commissioning


• Summary


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Flowchart of manufacturing


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W powder

W compactsintering

rolling

W plate

Cu,Cr&Zr

Ingotmelting

CuCrZr platerolling

Cu,Cr&Zr

Ingotmelting

CuCrZr tubesdrawing

W block W bar

Pure CuHIP HIP

W/Cu monoblock

NDT NDT

NDT

W/Cu slice

HIP Machining

W/Cu mono-block PFUs Baffle Dome upper Dome lowerpanel

EBW of two halves+legs+in/outlets

DOME

EBW of endcup+PFUs+trans-plate+baffle+legs+in/outlets

Target

Assembly to CB and in-vessel installation

He leak check at 1.5MPa/180 ℃

HIP

NDT+leak check

NDTNDT

NDT

Raw mater.

PFU manuf.

Assembly

ASIPP

ITER-like Monoblock W/Cu PFMC


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• W/Cu monoblocks prepared employing Hot Isostatic Pressing (HIP) technology (900 , 100MPa)℃

• W/Cu PFUs manufactured successfully by HIP technology (600 , 100MPa)℃ ， properties of CuCrZr after HIP satisfy the requirement

• NDT results: Bondings between monoblocks/OFC/CuCrZr tube excellent

HIPed

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Flat-type W/Cu PFCs• Casting + HIP: The interface of

W/Cu were joined by casting (1200 ℃), and then the interface of Cu/CuCrZr was bonded by HIP at lower temperature of 500~600℃.

• NDT results: bondings between W tiles/OFC/CuCrZr plate excellent


BAFFLE

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Parts joining: E-beam welding


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• Joining between monoblock units with endbox/manifold and flat baffle

• Joining of two-half parts for dome structural design

• Supporting legs and inlet/outlet cooling tubes joined to CuCrZr heat sink

• EBW: 60kV, 30-40mA

• Seam:3mm depth, 1mm width

1.2 mm

3.1 mm

CuCrZr

ASIPP

Outline




• Commissioning


• Summary


ASIPP

E-beam HHF testing

l W/Cu monoblock PFU: survived 1000 cycles of heat load of 10MW/m2, cooling water of 4m/s, 20 , 15s/15s ℃ on/off cycles

l W/Cu flat type mock-up: 1000 cycles, 5MW/m2, 4m/s, 20℃


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ASIPP


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US-NDT for W/Cu PFCs

NDT for mono-

block PFU

NDT for flat type PFU

• Single probe: scanning the inner surface

• The defects of Φ1mm in the interface of W/Cu and Cu/CuCuZr was detected clearly using this set-up

• 15000 W/Cu mono-blocks and 720 PFUs tested

• More than 30000 W/Cu slices and 240 flat PFUs have been tested by this set-up with detection limit of Φ1mm

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Hot Helium leak detection for PFCs


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• Evaluation of welding quality and reliability for EAST OVT, IVT and DOME components

• During baking: @ 180 for ℃ 20 min under 1.5 MPa (He inside)

• Background vacuum: < 5.4x10-3Pa; leak level: 2x10-11 Pa.m3.s-1

• Acceptance criteria: 1x10-10 Pa.m3.s-1

• 240 components (80 OVT, 80 IVT, 80 DOME) were tested

ASIPP

Outline




• Commissioning


• Summary


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Commissioning in 2014 • Twice leak events during baking a

t 170℃, and first repaired and second evacuated (given-up)

• Baking at the end of campaign at 280℃ to test PFCs and find weak points (possible leaks)

• After campaign, found 13 leak points, certain and uncertain causes!


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DOME pipe-plate joint Target pipe-plate joint

LeakingLeakingLeaking

Target plate-plate joint

Leaking of heat sink

ASIPP

Distribution of leaking components


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NBI-4MW

LHCD6MW

ICRF-6MW

LHCD

4MW

ICRF-6MW

NBI-4MW

-DOME pipe-plate joints

-Target pipe-plate joints

-Target plate-plate joints

-heat sink

• The leaking of pipe-plate joints occurred during baking

• Target plate-plate joints: cluster in NBI shine through areas; leaks occurred during plasma discharge

ASIPP

Outline


• W/Cu-PFUs


• Commissioning


• Summary


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Improvement-NDT for pipe-plate joints

• Develop the nondestructive testing technique for the welding seams of pipe-plate joints

• All pipe-plate joints (800 seams) were tested by NDT after removed from vacuum vessel

• Seams with depth <1.5mm were repaired


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10mA

15mA

20mA

25mA

30mA

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Improvement- CB structure• Cooling tubes welded directly to CB suffered high th

ermal stress during baking

• Cooling tube connection: hard welding → soft bellows


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Bellows

Hard welding

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Improvement-Hot Helium leak detection

• The pre-assembled “PFCs+CB” modules were qualified by helium leak detection technique before installation into VV

• Acceptance criteria: 1x10-10 Pa.m3.s-1

• During baking: @ 250 for ℃ 20 min under 1 MPa (He inside)


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Repairing of DOME pipe-plate joints


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• Repairing process: Remove pipe→Machine new pipe→ EBW→NDT→Helium leak detection

• Pipe-plate seam: Depth >2mm

• More than 40 DOME repaired

Top

Bo

ttom

ASIPP

Repairing of targets pipe-plate joints


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• Repairing process: Remove CuCrZr plate→Machine new pipe and plate→EBW pipe-plate seams→NDT→EBW plate-plate seams→Helium leak detection

• Pipe-plate seam: Depth >2mm

• More than 15 targets were repaired

Cut along the lines

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Campaign in 2015• Installation completed in

April

• Baking (May 6-) : 180~200℃

• No leaking observed

• Plasma discharge in June-July


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ASIPP

Summary• The production and installation of EAST W/Cu upper divertor h

ave been completed in April 2014

• The monoblock and flat-type W/Cu PFUs survived 1000 cycles of heat loads up to 10MW/m2 and 5MW/m2, respectively, with the cooling water of 4m/s, 20℃

• Qualification procedures and the acceptance criteria of W/Cu PFCs for EAST have been established

• During the baking of the EAST device some leaks in the EBW seams was detected

• Some improvements to PFCs have been considered

• Repairing has been completed in April 2015 and PFCs survived 200 baking of EAST device℃

• EAST W/Cu upper divertor project has realized large scale industrial manufacturing of actively cooled tungsten components and will provide precious experience and lessons for ITER divertor project


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ASIPP

Thanks for your attention!


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the development of w/cu-pfc s for east upper divertor

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