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Wednesday, February 27

A High-Fidelity Multiscale Computation Package for Reactor Applications

Tianeli Li, Postdoctoral fellow, ORNL
Materials Science and Technology Division,
Mechanical Properties and Mechanics Group, Seminar
9:30 AM — 10:30 AM, High Temperature Materials Laboratory (Building 4515), Room 265
Contact: Sam Sham (, 865.241.2130


Part I:
Grid to rod fretting (GTRF) is the most common cause of fuel failure in pressurized water reactors. It occurs due to flow-induced vibration of the fuel rods and irradiation-induced fuel creep down and grid growth, leading to a high-cycle fatigue interaction between the fuel rods and the springs and dimples of the spacer grid. The Consortium for Advanced Simulation of Light Water Reactors (CASL) has identified GTRF as one of the "Challenge Problems" that drive the requirement for the development and application of a modeling and simulation computational environment for predictive simulation of light water reactors. The presenter will discuss a high-fidelity multi-scale computation package that has been developed to attack the GTRF problem and enable designs to be optimized to reduce the potential for GTRF. Factors included in the package are fluid-structural interaction, multi-scale simulation of irradiation and thermal creep, and an adaptive-controlled friction model. This presentation will describe the computational fluid dynamics load and the structural dynamics coupling analysis, the implementation of the wear model, the roadmap from micro-scale defect activity to macro-scale finite element constitutive modeling of irritation and thermal creep, and substructure analysis of the fuel structural vibration and local contact wear.

Part II:
An elastic-perfect plastic material model that predicts plastic deformation behavior is used for the primary load design of Class 1 components at elevated temperature. This part of the talk outlines a series of assessment procedures used to determine the acceptability of a component subjected to design loads.