Ceramic nuclear fuel fracture modeling with the extended finite element method

Journal Article (Journal Article)

Ceramic fuel pellets used in nuclear light water reactors experience significant fracture due to the high thermal gradients experienced under normal operating conditions. This has important effects on the performance of the fuel system. Because of this, a realistic, physically based fracture modeling capability is essential to predict fuel behavior in a wide variety of normal and off-normal conditions. The extended finite element method (X-FEM) is a powerful method to represent arbitrary propagating discrete cracks in finite element models, and has many characteristics that make it attractive for nuclear fuel performance analysis. This paper describes the implementation of X-FEM in a multiphysics fuel performance code and presents applications of that capability. These applications include several thermal mechanics fracture benchmark problems, which demonstrate the accuracy of this approach. It also includes application of this capability to study nuclear fuel fracture, both on stationary and propagating cracks. The study on stationary cracks shows the effects of interactions between cracks, and aids in understanding the process of crack propagation during a power ramp. The propagating crack case demonstrates random initiation and subsequent propagation of interacting thermally induced cracks during an initial ramp to full power with fresh fuel.

Full Text

Duke Authors

Cited Authors

  • Jiang, W; Spencer, BW; Dolbow, JE

Published Date

  • January 1, 2020

Published In

Volume / Issue

  • 223 /

International Standard Serial Number (ISSN)

  • 0013-7944

Digital Object Identifier (DOI)

  • 10.1016/j.engfracmech.2019.106713

Citation Source

  • Scopus