Speaker
Eliseo Visca
(Department of Fusion and Technology for Nuclear Safety and Security)
Description
ENEA and Ansaldo Nucleare S.p.A. (ANN) have being deeply involved in the European International Thermonuclear Experimental Reactor (ITER) development activities for the manufacturing of the inner vertical target (IVT) plasma-facing components of the ITER divertor.
During normal operation the heat flux deposited on the bottom segment of divertor is 5-10 MW/m2 but the capability to remove up to 20 MW/m22 during transient events of 10 seconds must also be demonstrated.
This component has to be manufactured by using armour and cooling pipe materials defined by ITER. The physical properties of these materials prevent the use of standard joining techniques.
In order to overcome this difficulty, ENEA has set up and widely tested a manufacturing process, titled Hot Radial Pressing (HRP), suitable for the construction of these components.
The last challenge is now to fabricate, by means the new HRP facility, a full scale prototype of the IVT for the final qualification , that is the scope of the contract F4E-OPE-138 in which ENEA-ANN are now involved.
The tolerances and acceptance criteria of the IVT plasma facing units (PFU) are fixed by ITER/F4E and are very tight. The objective of manufacturing a PFU that satisfies these requirements is an ambitious target.
The final acceptance control to check the component compliance with the acceptance criteria is performed by ultrasonic water gap technique. For this purpose a new equipment suitable for the final control of PFUs by ultrasonic was developed and qualified in ENEA.
The paper reports a description of the innovative ultrasonic equipment together with the dimensional check results of the fabricated full tungsten full scale PFUs.
Co-authors
Andrea Reale
(Department of Fusion and Technology for Nuclear Safety and Security, ENEA, Frascati, Italy)
Donatella Candura
(Fusion Dept., Ansaldo Nucleare S.p.A., Genova, Italy)
Eliseo Visca
(Department of Fusion and Technology for Nuclear Safety and Security, ENEA, Frascati, Italy)
Emanuele Cacciotti
(Department of Fusion and Technology for Nuclear Safety and Security, ENEA, Frascati, Italy)
Giampiero Mugnaini
(Department of Fusion and Technology for Nuclear Safety and Security, ENEA, Frascati, Italy)
Luigi Verdini
(Department of Fusion and Technology for Nuclear Safety and Security, ENEA, Frascati, Italy)
Massimiliano Palermo
(Fusion Dept., Ansaldo Nucleare S.p.A., Genova, Italy)
Paolo Rossi
(Department of Fusion and Technology for Nuclear Safety and Security, ENEA, Frascati, Italy)
Selanna Roccella
(Department of Fusion and Technology for Nuclear Safety and Security, ENEA, Frascati, Italy)
Valerio Cerri
(Department of Fusion and Technology for Nuclear Safety and Security, ENEA, Frascati, Italy)
