Seismic responses of N-Reactor core. Independent review of Phase II work

Technical Report · Thu Aug 01 04:00:00 EDT 1985

OSTI ID:6249596

Chen, J C; Lo, T; Chinn, D J; Murray, R C; Johnson, J J; Maslenikov, O R

Seismic response of the N-Reactor core was independently analyzed to validate the results of Impell's analysis. The analysis procedure consists of two major stages: linear soil-structure interaction (SSI) analysis of the overall N-Reactor structure complex and nonlinear dynamic analysis of the reactor core. In the SSI analysis, CLASSI computer codes were used to calculate the SSI response of the structures and to generate the input motions for the nonlinear reactor core analysis. In addition, the response was compared to the response from the SASSI analysis under review. The impact of foundation modeling techniques and the effect of soil stiffness variation on SSI response were also investigated. In the core analysis, a nonlinear dynamic analysis model was developed. The stiffness representation of the model was calculated through a finite element analysis of several local core geometries. Finite element analyses were also used to study the block to block interaction characteristics. Using this nonlinear dynamic model along with the basemat time histories generated from CLASSI and SASSI, several dynamic analyses of the core were performed. A series of sensitivity studies was performed to investigate the discretization of the core, the effect of vertical acceleration, the effect of basemat rocking, and modeling assumptions. In general, our independent analysis of core response validates the order of magnitude of the displacement calculated by Impell. 11 refs., 110 figs., 12 tabs.

• Research Organization: Lawrence Livermore National Lab., CA (USA); NTS/Structural Mechanics Associates, Newport Beach, CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6249596
• Report Number(s): UCID-20683; ON: DE86008385
• Country of Publication: United States
• Language: English

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