No abstract available

No abstract available

No abstract available

No abstract available

No abstract available

[en] The paper illustrates 2 different mechanical stress situations which sensibly determined the European design of the LCT coil

[en] A discrete model for the one-dimensional incompressible transient axial squeeze potential flow within the thin fluid layer between two adjacent LMFBR sub-assemblies caused by the impulsive transverse bending of these beam-type core components is described. The numerical schemes used to determine the time- and space-dependent velocity and pressure fields are outlined. Emphasis is placed on the combined Lagrangian particle/Euler cell approach newly proposed here. In particular two different notions of Lagrangian particles, the convected Lagrangian particle (CLP) and the displaced Lagrangian particle (DLP) are introduced and evaluated. Some remarks on the coupling technique for the fluid-structure interaction are also given. Preliminary results recommend the DLP because of its higher computational efficiency. (Auth.)

[en] The paper deals with a detailed investigation of the interaction between sub-assemblies and coolant dynamics within an LMFBR core under transient pressure loading. The one-dimensional discrete model approximates the axial squeeze flow by a combined Lagrangian particle Euler cell approach. The coupling between the fluid and the structure is achieved by a step by step scheme. An energy balance criterion is used to improve its computational efficiency. An extension for two-dimensional squeeze flow, where axial and transverse flow around the subassembly may occur, completes the mathematical model. (author)

[en] The mechanical damage eventually occurring to a fast reactor fuel subassembly under an external MFCI-type vapor explosion must neither hamper the immediate scram nor produce dramatic reactivity changes. To demonstrate that this safety requirement is always met, an accurate numerical analysis of the transient hexcan behavior must include the pin-bundle and the liquid sodium inside. Therefore, the model theory discussed in this paper considers how properties like time-varying mass distribution and a hexagonal cross section flattening together with the strongly stiffening pin-bundle, and energy dispersion and dissipation due to axial fluid expulsion and growth of plastic zones as well as distributed pressure forces and inertia terms affect the elastoplastic bending of a single subassembly which is treated as a Timoshenko beam (i.e. shear and rotatory inertia are not neglected). (Auth.)

[en] The mechanical behaviour of the European coil for the Large Coil Task (LCT) is described by a finite element model. The emphasis is placed on the global interaction between the winding and the casing of the coil. (author)