ITER lip seal welding and cutting developments

Bruno Levésy (Corresponding Author), Jean Jacques Cordier, Tommi Jokinen, Veli P. Kujanpää, Miikka Karhu, Robin Le Barbier, Timo Määttä, Jean-Pierre Martins, Yuri Utin

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    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.
    Original languageEnglish
    Pages (from-to)1528-1531
    JournalFusion Engineering and Design
    Volume98-99
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed
    Event28th Symposium of Fusion Technology (SOFT) - San Diego, United States
    Duration: 19 Oct 201423 Oct 2014
    Conference number: 23

    Fingerprint

    Seals
    Welding
    Vacuum
    Mockups
    Robotic arms
    Laser beam welding
    Welds

    Keywords

    • ITER
    • port plug
    • sealing
    • maintenance
    • lip seal

    Cite this

    Levésy, B., Cordier, J. J., Jokinen, T., Kujanpää, V. P., Karhu, M., Le Barbier, R., ... Utin, Y. (2015). ITER lip seal welding and cutting developments. Fusion Engineering and Design, 98-99, 1528-1531. https://doi.org/10.1016/j.fusengdes.2015.06.161
    Levésy, Bruno ; Cordier, Jean Jacques ; Jokinen, Tommi ; Kujanpää, Veli P. ; Karhu, Miikka ; Le Barbier, Robin ; Määttä, Timo ; Martins, Jean-Pierre ; Utin, Yuri. / ITER lip seal welding and cutting developments. In: Fusion Engineering and Design. 2015 ; Vol. 98-99. pp. 1528-1531.
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    title = "ITER lip seal welding and cutting developments",
    abstract = "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.",
    keywords = "ITER, port plug, sealing, maintenance, lip seal",
    author = "Bruno Lev{\'e}sy and Cordier, {Jean Jacques} and Tommi Jokinen and Kujanp{\"a}{\"a}, {Veli P.} and Miikka Karhu and {Le Barbier}, Robin and Timo M{\"a}{\"a}tt{\"a} and Jean-Pierre Martins and Yuri Utin",
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    Levésy, B, Cordier, JJ, Jokinen, T, Kujanpää, VP, Karhu, M, Le Barbier, R, Määttä, T, Martins, J-P & Utin, Y 2015, 'ITER lip seal welding and cutting developments', Fusion Engineering and Design, vol. 98-99, pp. 1528-1531. https://doi.org/10.1016/j.fusengdes.2015.06.161

    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 journalArticleScientificpeer-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 -

    Levésy B, Cordier JJ, Jokinen T, Kujanpää VP, Karhu M, Le Barbier R et al. ITER lip seal welding and cutting developments. Fusion Engineering and Design. 2015;98-99:1528-1531. https://doi.org/10.1016/j.fusengdes.2015.06.161