r4.04.04 Models of metallurgical behavior of zircaloy

Summary:

This document presents metallurgical behavior models describing the structural transformations, upon heating and cooling, that zircaloy (fuel rod cladding) undergoes between approximately \(700°C\) and \(1000°C\).

• 1. Introduction
• 2. Presentation of the model
  • 2.1. Equilibrium proportion
  • 2.2. Evolution equation under heating
  • 2.3. Cooling evolution equation
  • 2.4. Conditions of use of the metallurgical model for any temperature transients
• 3. Numerical formulation
  • 3.1. Determining the direction of evolution
  • 3.2. Integration of equations
  • 3.3. Templates for other cases
• 4. Model ZIRC in Code_Aster
  • 4.1. Internal variables
  • 4.2. Using the model
• 5. Bibliography