DEMO vacuum vessel port closure plate sealing and fixation activities

Haertl, T.; Bachmann, Christian; Franke, Thomas; Germano, GM.; Janeschitz, G.; Juliaa, J-F.; Lefrancois, M.; Michel, B.

doi:10.1016/j.fusengdes.2022.113354

Cited by 4 publications

(2 citation statements)

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“…In the existing technological concepts, the fusion reaction occurs in plasma at a very high temperature (10 8 • C), which is needed to overcome the repulsive forces between the nuclei [3,4]. Impurities (atoms of different natures) in the plasma impede the process, thus, the reaction should take place in a vacuum vessel, which is an essential component in the fusion power plant [5][6][7]. Plasma-facing components (PFCs) suffer from helium bombardment and highly energetic neutrons, which can result in the following.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Crystal Orientation and Thermal State of a Pure Cu on the Formation of Helium Blisters

Shtuckmeyster,

Maman,

Vaknin

et al. 2024

Metals

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The factors that influence the formation of helium blisters in copper were studied, including crystallographic grain orientation and thermomechanical conditions. Helium implantation experiments were conducted at 40 KeV with a dose of 5 × 1017 ions/cm2, and the samples were then subjected to post-implantation heat treatments at 450 °C for different holding times. A scanning electron microscope (SEM) equipped with an electron backscatter diffraction (EBSD) detector was used to analyze the samples, revealing that the degree of blistering erosion and its evolution with time varied with the crystallographic plane of the free surface in different ways in annealed and cold rolled copper. Out of the investigated states, rolled copper with a (111) free surface had superior helium blistering durability. This is explained by the consideration of the multivariable situation, including the role of dislocations and vacancies. For future plasma-facing component (PFC) candidate material, similar research should be conducted in order to find the optimal combination of material properties for helium blistering durability. In the case of Cu selection as a PFC, the two practical approaches to obtain the preferred (111) orientation are cold rolling and thin layer technologies.

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Section: Introductionmentioning

confidence: 99%

The Influence of Crystal Orientation and Thermal State of a Pure Cu on the Formation of Helium Blisters

Shtuckmeyster,

Maman,

Vaknin

et al. 2024

Metals

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“…In the aspect of RM, the breeding blanket (BB) needs to be removed from the UP [2]; from the EP, the multipurpose deployer will engage and carry out different RM tasks, such as inspection, pipe cutting, and vacuum cleaning [3]; from the LP, the divertor is removed [4]. Considering each port, the PCP, bioshield door, bioshield plug, sealing [5], and other components may exist at the same time, and the RM of each component may adopt a similar RM strategy.…”

Section: Introductionmentioning

confidence: 99%

Design and Development on the Remote Maintenance Tools and Strategy of the Port Closure Plate in DEMO

Li,

Wu,

Eskelinen

et al. 2024

IEEE Trans. Plasma Sci.

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In the international thermonuclear experimental reactor (ITER) and the demonstration power plant (DEMO), there are three kinds of ports: the upper port (UP), the equatorial port (EP), and the lower port (LP). The applications and structures of the upper, equatorial, and LPs are different between those of ITER and DEMO. In DEMO, the breeding blankets (BBs) could be removed from the UP, a multipurpose deployer is transported and installed in the EP, and the divertor is maintained through the LP. It is noted that during remote maintenance (RM), the operating environment must be safe for the operators. To achieve this goal, reliable RM tools and RM strategies must be designed and developed. One of the containment barriers of the tokamak is the port closure plates (PCPs), which weighs between 1.3 and 25 tons depends on its location, and the PCPs need to be removed during the maintenance process. Therefore, in this article, the current designs of the PCPs are first presented. Then, the RM tools in both commercial and research stages are studied for the RM of the PCPs. Next, the RM strategies are designed and developed for each port. Finally, suggestions for the development of different RM tools are proposed.

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