Arena, P.

Bongiovi, G.

Catanzaro, I.

Chiovaro, P.

Del Nevo, A.

Di Maio, P.A.

Forte, R.

Maione, I.A.

Vallone, E.

English

Di Maio, P. A.

Maione, I. A.

KITopen

NO OP VDE-upDeformed vs. Undeformed shape - Isotropic deformation amplification factor = 20NO OP VDE-upNO OP VDE-upStructural assessment of the EU-DEMO WCLL Central Outboard Blanket Segment under normal and off-normal operating conditionsAbstractWithin the framework of the EUROfusion design activities concerning the EU-DEMO Breeding Blanket (BB) system, a research campaign has been carried out at the University of Palermo withthe aim of investigating the structural behaviour of the DEMO Water-Cooled Lithium Lead (WCLL) Central Outboard Blanket (COB) segment. The assessment has been performed consideringthree different loading scenarios: the Normal Operation (NO), the Over-Pressurization (OP) and the Vertical Displacement Event up (VDE-up). In particular, NO scenario represents the loadingcase referring to the nominal operating conditions, whereas the OP scenario refers to the loading conditions due to an in-box LOCA accident, listed as one of the BB design basis accidentalevents. Lastly, the VDE-up scenario is an off-normal event reproducing the plasma disruption caused by an uncontrolled vertical motion of the plasma volume. This event brings the plasma incontact with the upper walls, generating a sudden energy discharge accompanied by relevant electromagnetic (EM) forces on the structure. The study has been conducted following a theoretical-numerical approach based on the Finite Element Method (FEM) and adopting the quoted ABAQUS v. 6.14 commercial FEM code. In particular, a detailed 3D FEM model of the whole COBsegment, including the back-supporting structure and its attachment system to the vacuum vessel, has been set up. Several simulations have been carried out to assess the thermo-mechanicalperformances of the segment under the afore-mentioned loading scenarios, taking into account also the impact of the W-armour on the overall structural response. The structural integrityassessment has been also evaluated in view of the RCC-MRx structural design rules.I. Catanzaroa*, P. Arenab, G. Bongiovìc, P. Chiovaroa, A. Del Nevob, P.A. Di Maioa, R. Fortea, I.A. Maionec,, E. ValloneaaDepartment of Engineering, University of Palermo, Palermo, ItalybENEA CR Brasimone, Camugnano, ItalycKarlsruhe Institute of Technology (KIT), Institute for Neutron Physics and Reactor Technology (INR), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germanyilenia.catanzaro@unipa.it1. Central Outboard Blanket segment model3D FEM model of the WCLL Central Outboard Blanket segment has been set-up.Moreover, with the aim of studying the impact of the tungsten on the thermomechanicalbehavior of the structure, two different models have been performed.2. Thermo-mechanical loads and boundary conditionsFinite Element model composed of ~2.3 M nodes connected in ~ 4.6 M tetrahedral andhexahedral linear elements. The loading conditions concerning NO, OP and VDE-upscenarios have been considered in order to investigate the COB segment thermo-mechanical behavior.NO scenario OP scenario VDE-up scenarioNon-uniform thermaldeformation fieldImposed thermal field drawn from reference WCLL COB Equatorial Region analysisImposed thermal field drawn from reference WCLL COB Equatorial Region analysisImposed thermal field drawn from reference WCLL COB Equatorial Region analysisPressure• 17.825 MPa on the coolant-wetted surfaces• 0.575 MPa on the breeder-wetted surfaces• 17.825 MPa on the coolant-wetted surfaces• 17.825 MPa on the breeder-wetted surfaces• 17.825 MPa on the coolant-wetted surfaces• 0.575 MPa on the breeder-wetted surfacesGravity load Gravity acceleration Gravity acceleration Gravity accelerationElectro-Magnetic (EM) loads• Maxwell´s forces• Lorentz´s forcesMechanical restraints COB attachment system COB attachment system COB attachment system11.52 sStiffening Plates(SPs)TungstenAttachment SystemSegment Box (SB)3. Results• COB with Tungsten• COB without TungstenDeformed vs. Undeformed shape - Isotropic deformation amplification factor = 20VDE-up• Interpolated thermal field• Original thermal field

Structural assessment of the EU-DEMO WCLL Central Outboard Blanket Segment under normal and off-normal operating conditions

https://publikationen.bibliothek.kit.edu/1000124686/89937956

Structural assessment of the EU-DEMO WCLL Central Outboard Blanket Segment under normal and off-normal operating conditions

Abstract

Similar works

Full text

Available Versions

KITopen