Seismic soil structure interaction analysis

SCK•CEN Mentor

Yoo Bong, byoo@sckcen.be, +32 (0)14 33 34 78

Expert group

Primary System Design

SCK•CEN Co-mentor

Engelen Jeroen, jengelen@sckcen.be, +32 (0)14 33 80 24

Introduction

The SCK•CEN is developing a 100MWth multipurpose hybrid research reactor called MYRRHA. Heavy structures like MYRRHA reactor building founded on soft ground may experience significant differences in their seismic response with respect to the same structures founded on stiff rock. Soil-structure interaction problems are complex and involve wave propagation, soil and structural dynamics, soil constitutive behaviour and numerical modelling.  It is important for the design to understand the soil structure interaction(SSI) effects of the reactor building founded on multi-layered soft soils housing safety critical structures, systems, and components (SSC) including reactor vessel when subjected to EL-1 (Earthquake Level 1, or Design Basis Earthquake (DBE)) and EL-2 (or Design Extension Condition Earthquake (DEC-E)). The output of the SSI analysis provides with floor response spectra (FRS) as seismic input motions for the SSC, especially, reactor vessel, as one of the most saftey critical structure, which contains heavy liquid metal LBE (Lead Bismuth Eutectic) and its safety related internals.

 

Objective

The objective of this work is to develop FRS for both EL-1 and EL-2 using impedance SSI analysis method either P-CARES or ACS-SASSI for the comparison of FRS of a simplified model of reactor building and reactor vessel. The SSI procedures will be established, and will be a path to find a less conservative approach for EL-2 evaluation other than the best estimate approach. 

The minimum diploma level of the candidate needs to be

Academic bachelor