Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 1528-1531 |
| Journal | Fusion Engineering and Design |
| Volume | 98-99 |
| DOIs | |
| Publication status | Published - 2015 |
| MoE publication type | A1 Journal article-refereed |
| Event | 28th Symposium of Fusion Technology (SOFT) - San Diego, United States Duration: 19 Oct 2014 → 23 Oct 2014 Conference number: 23 |
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Keywords
- ITER
- port plug
- sealing
- maintenance
- lip seal
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ITER lip seal welding and cutting developments. / Levésy, Bruno (Corresponding Author); Cordier, Jean Jacques; Jokinen, Tommi; Kujanpää, Veli P.; Karhu, Miikka; Le Barbier, Robin; Määttä, Timo; Martins, Jean-Pierre; Utin, Yuri.
In: Fusion Engineering and Design, Vol. 98-99, 2015, p. 1528-1531.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - ITER lip seal welding and cutting developments
AU - Levésy, Bruno
AU - Cordier, Jean Jacques
AU - Jokinen, Tommi
AU - Kujanpää, Veli P.
AU - Karhu, Miikka
AU - Le Barbier, Robin
AU - Määttä, Timo
AU - Martins, Jean-Pierre
AU - Utin, Yuri
PY - 2015
Y1 - 2015
N2 - The welded lip seals form part of the torus primary vacuum boundary in between the port plugs and the vacuum vessel, and are classified as Protection Important Component. In order to refurbish the port plugs or the in-vessel components, port plugs have to be removed from the machine. The lip seal design must enable up to ten opening of the vacuum vessel during the life time operation of the ITER machine. Therefore proven, remote reliable cutting and re-welding are essential, as these operations need to be performed in the port cells in a nuclear environment, where human presence will be restricted. Moreover, the combination of size of the components to be welded (~10. m long vacuum compatible thin welds) and the congested environment close to the core of the machine constraint the type and size of tools to be used.This paper describes the lip seal cutting and welding development programme performed at the VTT Technical Research Centre, Finland. Potential cutting and welding techniques are analyzed and compared. The development of the cutting, TIG and laser welding techniques on samples are presented. Effects of lip seal misalignments and optimization of the 2 welding processes are discussed. Finally, the manufacturing and test of the two 1.2. m. *. 1. m representative mock-ups are presented. The set-up and use of a robotic arm for the mock-up cutting and welding operations are also described.
AB - The welded lip seals form part of the torus primary vacuum boundary in between the port plugs and the vacuum vessel, and are classified as Protection Important Component. In order to refurbish the port plugs or the in-vessel components, port plugs have to be removed from the machine. The lip seal design must enable up to ten opening of the vacuum vessel during the life time operation of the ITER machine. Therefore proven, remote reliable cutting and re-welding are essential, as these operations need to be performed in the port cells in a nuclear environment, where human presence will be restricted. Moreover, the combination of size of the components to be welded (~10. m long vacuum compatible thin welds) and the congested environment close to the core of the machine constraint the type and size of tools to be used.This paper describes the lip seal cutting and welding development programme performed at the VTT Technical Research Centre, Finland. Potential cutting and welding techniques are analyzed and compared. The development of the cutting, TIG and laser welding techniques on samples are presented. Effects of lip seal misalignments and optimization of the 2 welding processes are discussed. Finally, the manufacturing and test of the two 1.2. m. *. 1. m representative mock-ups are presented. The set-up and use of a robotic arm for the mock-up cutting and welding operations are also described.
KW - ITER
KW - port plug
KW - sealing
KW - maintenance
KW - lip seal
U2 - 10.1016/j.fusengdes.2015.06.161
DO - 10.1016/j.fusengdes.2015.06.161
M3 - Article
VL - 98-99
SP - 1528
EP - 1531
JO - Fusion Engineering and Design
JF - Fusion Engineering and Design
SN - 0920-3796
ER -