Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Simplified beam model of high burnup spent fuel rod under lateral load considering pellet-clad interfacial bonding influence

  • Lee, Sanghoon (Department of Mechanical and Automotive Engineering, Keimyung University) ;
  • Kim, Seyeon (Department of Mechanical and Automotive Engineering, Keimyung University)
  • Received : 2018.12.24
  • Accepted : 2019.03.14
  • Published : 2019.06.25
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Abstract

An integrated approach of model simplification for high burnup spent nuclear fuel is proposed based on material calibration using optimization. The spent fuel rods are simplified into a beam with a homogenous isotropic material. The proposed approach of model simplification is applied to fuel rods with two kinds of interfacial configurations between the fuel pellets and cladding. The differences among the generated models and the effects of interfacial bonding efficiency are discussed. The strategy of model simplification adopted in this work is to force the simplified beam model of spent fuel rods to possess the same compliance and failure characteristics under critical loads as those that result in the failure of detailed fuel rod models. It is envisioned that the simplified model would enable the assessment of fuel rod failure through an assembly-level analysis, without resorting to a refined model for an individual fuel rod. The effective material properties of the simplified beam model were successfully identified using the integrated optimization process. The feasibility of using the developed simplified beam models in dynamic impact simulations for a horizontal drop condition is examined, and discussions are provided.

Keywords

References

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