11. FPIN2: Pre-Failure Metal Fuel Pin Behavior Model

• 11.1. Introduction
  • 11.1.1. Brief Description of FPIN2
  • 11.1.2. Overview
• 11.2. Fuel Element Mechanics
  • 11.2.1. Basic Stress-Strain-Displacement Equations
  • 11.2.2. Algorithm for Separating the Components of the Total Strain
  • 11.2.3. Continuous Cracking Model
  • 11.2.4. Finite Element Formulation
  • 11.2.5. Large Strain Analysis
• 11.3. Metal Fuel Element Models
  • 11.3.1. Central Cavity and Plenum Models
  • 11.3.2. Extrusion of Molten Fuel into the Plenum
  • 11.3.3. Basic Metal Fuel Properties
  • 11.3.4. Secondary Creep of Metallic Fuels
  • 11.3.5. Fission Induced Gas Swelling of Metal Fuels
  • 11.3.6. Generalized Plastic Flow Behavior of Cladding Materials
  • 11.3.7. Fuel-Cladding Eutectic Formation
  • 11.3.8. Fuel Element Failure
• 11.4. Integration into SAS4A/SASSYS‑1 and Usage of Integrated Model
  • 11.4.1. SAS-FPIN2 Coupling Methodology
  • 11.4.2. Input Description for Interfaced SAS-FPIN2 Calculation
  • 11.4.3. Pre-transient Fuel Element Characterization
  • 11.4.4. Output Description and Graphics File Usage
• 11.5. References
• 11.6. Nomenclature
• 11.7. Appendices
  • 11.7.1. Appendix 11.1: Explicit Formulas for Stiffness Matrix and Load Vector
  • 11.7.2. Appendix 11.2: List of Input Variables for Standalone FPIN2 Calculation