Investigation of Fabrication Technologies for Japanese ...

Japan Atomic Energy Agency

Investigation of Fabrication Technologies for Japanese ITER Test Blanket Module

T. Hirose, Y. Nomoto, M. Enoeda and M. AkibaBlanket Technology Group


Thirteenth International Workshop on Ceramic Breeder Blanket Interactions

30 Nov–2 Dec 2005

Fess Parker DoubleTree Resort, Santa Barbara, CA, USA


Fabrication process of F82H thin tubes for TBM was tested.

The pretreatment condition of F82H was investigate.


Contents

Background

Trial of tube milling for TBM

Pretreatment effects on F82H HIP joint

Summary


Japanese WCSB TBM

First wallFirst wallSide wallSide wall Breeding Breeding

layerlayerBackBackwallwall

ArmorArmor

WCSB TBMWCSB TBMStructural material is reduced activation ferritic/martensitic steel, F82H.


Reduced activation ferritic/martensitic steel, RAF/M

RAF/M is a kind of 9Cr heat resisting steel.– T91: 9%Cr-1%Mo-Nb, V– F82H: 8%Cr-2%W -Ta, V

Technically matured in boiler and pressure vessel.


Commercial 9%Cr steel

The steel is usually used for thin wall structure.

It is usually jointed by welding.


Pipe list for WCSB-TBMDimension

Thick. OD Length(mm) (mm) (mm)

First wall 11mm square 1.5 11 2850Side wall 13.6mm square 1.8 13.6 1690BW purge gas inlet 25.4mm cylinder 3.5 25.4 200BW coolant inlet 101.6mm cylinder 12.7 101.6 200Membrane panel 11mm cylinder 1 11 1740Connecting pipe to BW 34mm cylinder 4.5 34 500Cable conduit 70mm cylinder 10 70 200Cable conduit 13.8mm cylinder 3.4 13.8 300Purge gas 10.5mm cylinder 1 10.5 600

Parts Name

Thin structure is required for TBR.Thin structure is required for TBR.


Fabrication of first wall Structure

11mm x 1.5Tmm square tube

5.5mmT plate

7.5mmT plate

HIP joint

The first wall consists of thin plates and thin square tubes.These pipe and plates are jointed by Hot Isostatic Pressing, HIP method.

25m

m


Issues in TBM fabrication process

Thick structure must be technically validated.

Perfect HIP condition is required, because of its difficulty in non-destructive inspection.


Process of cold tube milling

150kg ingot Forging

Annealing Cold rolling

This method is applied for fuel clad of LWR.

φ30 x 590Lrod24pcs

Drilling φ30 x 5T x 590L tube


Dimensional change in cold rolling

After the each path, the pipes were annealed at 1083K.

φ15.8x1.5T x 3.2m tubes were successfully milled.

Neither bowing nor cracking occurred.


Hardness change in cold rolling

Vickers hardness tests were done on the cross section.Softened microstructure can be recovered by HIP process.

OuterOuter

MiddleMiddle

InnerInner

Typical Typical HvHv of F82Hof F82H


Thin cylinder tube

In case of 9%Cr, φ30x5T pipe is produced by hot extrusion.This method can be applied to future mass production.

φφ30x530x5TT φφ28x4.428x4.4TT φφ26x3.926x3.9TT φφ24x3.424x3.4TT

φφ22x2.822x2.8TT φφ20x2.220x2.2TT φφ18x1.818x1.8TT φφ15.9x1.515.9x1.5TT


Square tube fabrication by cold rolling

1 2 3 4 5 6 7

φ15.9x1.5T cylindrical tube was cold-milled by seven rolls.The cross section was gradually deformed to square.


11x1.5T square tubeWidth： 11±0.05mmThick： 1.5±0.04mmRouter： <1.4mmRinner： <0.6mmLength： >3200mmR<0.6

R<1.4


11x1.5T square tube

First wallFirst wall

51017

40Width： 11±0.05mmThick： 1.5±0.04mmRouter： <1.4mmRinner： <0.6mmLengthLength：： >3200mm>3200mm

Total wall length is 2760mmTotal wall length is 2760mm


11x1.5T square tube


F82H for TBM fabricationDimension Module

Thick. Width/OD Length Quantity Weight(mm) (mm) (mm) (kg) (kg)

4mmT plate 4 600 2000 38 3 114 Hot rolling9mmT plate 7.5 400 3000 71 2 142 Hot rolling12mmT plate 12 600 3000 170 10 1700 Hot rolling16mmT plate 16 400 2000 101 8 808 Hot rolling50mmT plate 50 400 1000 158 4 632 Hot rolling92mmT plate 92 400 2000 580 2 1160 Hot rolling11mm square 1.5 11 3000 3 60 180 Billet & cold rolling11mm cylinder 1 11 2000 4 90 360 Billet & cold rolling13.6mm square 1.8 13.6 2000 3 40 120 Billet & cold rolling13.8mm cylinder 3.4 13.8 300 3 16 48 Billet & cold rolling3.5mm cylinder 3.5 25.4 500 3 4 12 Billet & cold rolling34mm cylinder 4.5 34 500 3 24 72 Billet & cold rolling70mm cylinder 10 70 200 6 16 96 Welded pipe101.6mm Cylinder 12.7 101.6 500 20 4 80 Welded pipe

MethodWeight/partsName

Total: 5500kg


Summary of Pipe and Plates for TBM

Each parts and plates can be provided by labo-scale melting (150-300kg) except for back wall (580kg).

Thin tube can be provided by cold rolling method.

Fabrication process of each parts has been validated.


Effects of pre-treatment conditions on F82H HIP joint


Conventional HIP process

Parts polishing(Rmax 44->4μm)

Degassing inside can(10-3Pa @ 1273K)

canning

assembling

HIP

HIP(1313Kx 150MPa x 2hr.)

HIP

PHHT

300300

200200

Square Square channelchannel

Degassing for parts

Effects of pretreatment condition was studied.


Tensile properties of HIP joint

Tensile properties of HIP joint seemed to be same as those of base metal.

Degassing for parts: 573K HIP: 1373K x 150MPa x 2h.PHHT: 1233K x 0.5h + 1023K x 1.5h


Impact properties of HIP joint

Degassing inside can is required to complete HIP joint.


Recovery of impact properties by thermal aging

Decrease in absorbed energy was caused by surface oxide.Removing oxide and diffusion of oxide are important process for HIP.


Summary of HIP joint

Tensile tests was insensitive to HIP joint. Appropriate evaluation method must be established.

Surface oxide had significant damage on joint properties.

Surface oxide should be removed at pretreatment process, however, thermal aging after HIP could be a solution to recover the impact property.

Investigation of Fabrication Technologies for Japanese ...

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