Fast Reactors and Accelerator Driven Systems Knowledge Base

Conference Article: Seismic analysis for PEC fast reactor core experiments using the SAFA program

Horiuchi, T.; Motomiya, T. (Hitachi Ltd., Tokyo (Japan))

Abstract

As a part of the IAEA/IWGFR coordinated research program on LMFBR seismic analysis codes, the results of the PEC fast reactor core experiments conducted by Italy were analyzed and the experimental and computational results were compared. The computer program named SAFA developed by Hitachi, Ltd. to analyze core component vibration of fast breeder reactor core components during seismic excitation, was applied for the bench mark calculation. The SAFA models subassemblies as finite element method beam elements. Fluid interaction force is considered as added mass and time integration is done using mode superposition and the method proposed by Nigam. Load pad impact is modeled using a gap, a linear spring, and a linear damper. It also uses a new method to determine the nonlinear impact force without usage of convergence iteration. The comparison of the experimental and calculational results showed a good agreement in displacement and acceleration records.

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key words: lmfbr type reactors; mechanical vibrations; reactor cores; reactor safety experiments; s codes; safety analysis; seismic effects
Reference:
Research co-ordination meeting on intercomparison of liquid metal fast reactor seismic analysis codes. Vienna (Austria). 16-17 Nov 1993
International Atomic Energy Agency, Vienna (Austria)
IAEA-TECDOC--798, pp:106-117