Vacuum Vessel Analysis and Design for the ARIES-ACT1 Fusion Power Plant (original) (raw)

Design Analysis And Optimization of Double Wall Vacuum Vessel- A Review Paper

Present study is aimed towards design and study of cryogenic doubled wall vacuum vessels. A liquid nitrogen storage vessel has been considered for present study. Thermal loading due to temperature differential between low temperature liquid nitrogen and atmospheric temperature is considered as a major factor for designing the vessel. In addition to this, fatigue due to thermal cycling of vessel is considered. Moreover vessel will be subjected to structural loads, e.g. dead weight of the vessel, transportation accelerations and seismic actions. All these structural boundary conditions are applied for present study and accordingly design and optimization of vessel is carried out.

ITER vacuum vessel design and construction

Fusion Engineering and …, 2010

According to recent design review results, the original reference vacuum vessel (VV) design was selected with a number of modifications including 3D shaping of the outboard inner shell. The VV load conditions were updated based on reviews of the plasma disruption and vertical displacement event (VDE) database. The lower port gussets have been reinforced based on structural analysis results, including non-linear buckling. Design of in-vessel coils for the mitigation of edge localized modes (ELM) and plasma vertical stabilization (VS) has progressed. Design of the in-wall-shielding (IWS) has progressed in details. The detailed layout of ferritic steel plates and borated steel plates is optimized based on the toroidal field ripple analysis. The procurement arrangements (PAs) for the VV including ports and IWS have been prepared or signed. Final design reviews were carried out to check readiness for the PA signature. The procedure for licensing the ITER VV according to the French Order on Nuclear Pressure Equipment (ESPN) has started and conformity assessment is being performed by an Agreed Notified Body (ANB). A VV design description document, VV load specification document, hazard and stress analysis reports and particular material appraisal were submitted according to the guideline and RCC-MR requirements.

Structural analysis of alternative designs for the ITER vacuum vessel and support

Fusion Engineering and Design, 2011

The ITER vacuum vessel (VV) consists of three main sub-components; main vessel, port structures and the VV supporting system. In this study, the modified designs for the main vessel and the supporting system have been proposed, and the stress analyses have been conducted to investigate their structural integrities. In the original design of the main vessel, the assembling works of the flexible support housing into the outer shell is so difficult that the modified design concept is suggested for easier fabrication. To simplify the VV supporting system for better maintainability and to reduce its fabricating cost, the multiflexible plates with rigid restraint for the VV support have been proposed. The flexible plate support is surrounded by a rigid restraint with a rectangular cask. As a result of this study, the availability to adopt the modified design concept of the supporting system as well as the main vessel in the ITER VV design has been reviewed.

Design finalization and start of construction of ITER vacuum vessel

Fusion Engineering and Design, 2011

The vacuum vessel (VV) design is being finalized including interface components, such as the support rails and feedthroughs of coils for mitigation of edge localized modes (ELM) and vertical stabilization (VS) of the plasma (ELM/VS coils). It was necessary to make adjustments in the locations of the blanket supports and manifolds to accommodate the design modifications in the ELM/VS coils. The lower port gussets were reinforced to keep a sufficient margin under the increased VV load conditions. The VV support design is being finalized as well, with an emphasis on structure simplification. The design of the inwall shielding (IWS) has progressed, considering assembly and required tolerances. The layout of ferritic steel plates and borated steel plates will be optimized based on on-going toroidal field ripple analysis. The VV instrumentation was defined in detail. Strain gauges, thermocouples, displacement meters and accelerometers shall be installed to monitor the status of the VV in normal and off-normal conditions to confirm all safety functions are performed correctly. The ITER VV design was preliminarily approved, and the VV materials including 316L(N) IG were already qualified by the Agreed Notified Body (ANB) according to the procedure of Nuclear Pressure Equipment Order.

Design progress of the ITER vacuum vessel sectors and port structures

Fusion Engineering and Design, 2007

Recent progress of the ITER vacuum vessel (VV) design is presented. As the ITER construction phase approaches, the VV design has been improved and developed in more detail with the focus on better performance, improved manufacture and reduced cost. Based on achievements of manufacturing studies, design improvement of the typical VV Sector (#1) has been nearly finalized. Design improvement of other sectors is in progress-in particular, of the VV Sectors #2 and #3 which interface with tangential ports for the neutral beam (NB) injection. For all sectors, the concept for the in-wall shielding has progressed and developed in more detail. The design progress of the VV sectors has been accompanied by the progress of the port structures. In particular, design of the NB ports was advanced with the focus on the beam-facing components to handle the heat input of the neutral beams. Structural analyses have been performed to validate all design improvements.

Design and analysis of the vacuum vessel for RTO/RC-ITER

Fusion Engineering and Design, 2000

Recent progress in design and analysis of the vacuum vessel (VV) for the reduced technical objectives/reduced cost International Thermonuclear Experimental Reactor (RTO/RC-ITER) is presented. The basic VV design is similar to the previous ITER VV. However, because the back plate for the blanket modules could be eliminated, its previous functions could be transferred to the VV. For this option, the blanket modules are supported directly by the VV and the blanket coolant channels are structurally part of the VV double wall structure. In addition, a 'tight fitting' configuration is required to correctly position the modules' first wall. Although such modifications of the VV complicate its structure and increase its fabrication cost, the design of the VV is considered to be still feasible. The structural analyses of the VV have been conducted using several FE models of the VV, including global and local models. Although further assessment is required, based on the analyses performed to date, the structural aspects of the VV for the case without the back plate appear feasible.

Design progress of the vacuum vessel sectors and ports towards the ITER construction

Fusion Engineering and Design, 2008

Recent progress of the ITER vacuum vessel (VV) design is presented. As the ITER construction phase approaches, the VV design has been improved and developed in more detail with the focus on better performance, improved manufacture and reduced cost. Based on the achievements of manufacturing studies being performed in cooperation with the ITER participant teams (PTs), design improvement of the typical VV sector (#1, see the legend to figure 1 in this article) has been nearly finalized. Design improvement of other sectors is in progress-in particular, of the VV sectors #2 and #3 which interface with tangential ports for the neutral beam (NB) injection. For all sectors, the concept for the in-wall shielding has progressed and developed in more detail. The design progress of the VV sectors has been accompanied by the progress of the port structures. Structural analyses have been performed to validate all design improvements.

Design approach of the vacuum vessel and thermal shields towards assembly at the ITER-site

Fusion Engineering and Design, 2009

Recent progress of the ITER vacuum vessel (VV) and thermal shields (TS) design is presented. As the ITER construction phase approaches, the design of the VV and TS (in particular, the vacuum vessel TS-VVTS) has been improved and developed in more detail with the focus on better performance, improved manufacturing ability and successful assembly at the ITER-site. In addition to the design progress, the main principles and operations for assembly of the VV, VVTS and other TS components at the ITER-site are described.

Bolted Ribs Analysis for the ITER Vacuum Vessel using Finite Element Submodelling Techniques

Fusion Engineering and Design, 2014

h i g h l i g h t s • The ITER Vacuum Vessel Bolted Ribs assemblies are modelled using Finite Elements. • Finite Element submodelling techniques are used. • Stress results are obtained for all the assemblies and a post-processing is performed. • All the elements of the assemblies are compliant with the regulatory provisions. • Submodelling is a time-efficient solution to verify the structural integrity of this type of structures.