Prime pagine RA2010FUS:Copia di Layout 1 - ENEA - Fusione

technology programme (cont’d.)
progress report
2010
057
3.1 Divertor, First Wall, Vacuum Vessel and Shield
Manufacturing technology for the ITER inner vertical target
ENEA has been deeply involved in the ITER R&D activities for the manufacturing of high heat flux
plasma–facing components, and in particular for the inner vertical target (IVT) of the ITER divertor.
This component has to be manufactured by using both armour and structural materials whose properties are
defined by ITER. Their physical properties prevent standard joining techniques from being applied. The
reference armour materials are tungsten and carbon/carbon fibre composite (CFC), and, for the cooling pipe,
a copper alloy (CuCrZr).
During the last years ENEA, in collaboration with Ansaldo, has been manufacturing several actively cooled
mock–ups and prototypical components of different length, geometry and materials, by using innovative
processes: hot radial pressing (HRP) and pre–brazed casting (PBC).
The optimization of the processes started from the successful manufacturing of both W and CFC small scale
mockups and successful testing in the worst ITER operating condition (20 MW/m 2 ) through the achievement
of record performances obtained from a medium scale IVT CFC and W armoured mockup: after ITER
relevant heat flux fatigue testing (20 MW/m 2 for 2000 cycles CFC part, 15 MW/m 2 for 2000 cycles W part)
it reached a critical heat flux of 35 MW/m 2 at ITER relevant thermal–hydraulic conditions.
On the basis of these results, ENEA–ANSALDO participated in the European program for the qualification
and manufacturing of the divertor IVT, according to the Fusion For Energy (F4E) specifications. A divertor
IVT prototype (400 mm total length) with three plasma facing component units (fig 3.1) was successfully tested
at ITER relevant thermal heat fluxes (20 MW/m 2 for 3000 cycles CFC part, 15 MW/m 2 for 3000 cycles W
part).
Now, this technology is ready to face the challenge of the ITER
IVT production, thus transferring the experience gained in the
development, optimization and qualification of the PBC and
HRP processes to an industrial production line.
Qualification of ultrasonic non–destructrive testing method
for plasma facing components
Under the “EURATOM Training Network for Plasma–facing
Materials” (ETN_PFM) (Contract No. 042314 (FU 06)), ENEA
was assigned with a trainee to be prepared in the area of
“Design, manufacturing and acceptance procedures of PFC”.
This area is strictly linked to the activities related to the
Figure 3.1 – ITER divertor IVT qualification
prototype manufactured by ENEA–Ansaldo