Lifetime assessment of the modified grounded grid in the negative ion source SPIDER

Tomšič, Pavel (author), Berton, G. (author), Zaccaria, P. (author), Agostinetti, Piero (author), Pavei, M. (author), Marcuzzi, Diego (author)

In a nuclear fusion reactor, some components of the system are subjected to huge thermal loads. These components, such as grids, neutralizers, calorimeters, ducts, divertors, blankets etc. have to be actively cooled in order to avoid damage, functionality problems and specially to ensure their reliability. The design process of such components requires taking into account several physical phenomena, with the goal of not only satisfying the functionality conditions, but also with a focus on the structural verifications and component lifetime. For assessment of the structural design for components in ITER, the ITER Structural Design Criteria for In-vessel Components (SDC-IC) represent the reference verification criteria. The aim of this work is to investigate the relationship between the cooling system performance and the fatigue life. In this work a generalized framework for the evaluation of cooling system components is presented, taking into account the necessary input parameters, performing numerical analyses, division of component into several interest regions and assessing the fatigue life. The performed numerical analyses are a set of coupled CFD and thermo-structural analyses. A case study is presented for a critical component, the Grounded Grid (GG), inside the SPIDER beam source experiment at Consorzio RFX, Padova, Italy. The presented test case includes cooling system effectiveness analysis, assessment of the temperature distribution on housing during operations, mapping the pressure distribution inside the cooling system and finally assessment of the maximum number of allowed cycles.

• Language: English
• Keywords: nuclear fusion, cooling system, fatigue life, computational fluid dynamics, finite element method, neutral beam injectors
• Work type: Article
• Typology: 1.08 - Published Scientific Conference Contribution
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 7 str.
• Numbering: Vol. 195, art. 113982
• PID: 20.500.12556/RUL-153413
• UDC: 539.1:519.2
• ISSN on article: 1873-7196
• DOI: 10.1016/j.fusengdes.2023.113982
• COBISS.SI-ID: 179443971
• Publication date in RUL: 04.01.2024

Record is a part of a journal

• Title: Fusion engineering and design
• Publisher: Elsevier
• ISSN: 1873-7196
• COBISS.SI-ID: 23146245

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: Slovenian
• Keywords: jedrska fuzija, hladilni sistemi, življenjska doba, računalniška dinamika tekočin, metoda končnih elementov, injektorji z nevtralnim žarkom

Projects

• Funder: Other - Other funder or multiple funders
• Funding programme: ITER Organization
• Name: Neutral Beam Testing Facility
• Acronym: NBTF

• Funder: EC - European Commission
• Funding programme: Euratom Research and Training Programme
• Project number: 101052200
• Acronym: EUROfusion