5. Primary and Intermediate Loop Thermal Hydraulics Module

• 5.1. Introduction
• 5.2. Hydraulic Calculations
  • 5.2.1. Compressible Volumes and Liquid Segments
  • 5.2.2. Estimated Core Flow
  • 5.2.3. Method of Solution
  • 5.2.4. Degree of Implicitness
• 5.3. Specific Components: Contributions to Flow and Pressure Equations
  • 5.3.1. Compressible Volumes Without Cover Gas
  • 5.3.2. Compressible Volumes With Cover Gas
  • 5.3.3. Pipes and Intermediate Heat Exchangers
  • 5.3.4. Pumps
  • 5.3.5. Valves
  • 5.3.6. Check Valves
• 5.4. Liquid Temperature Calculations
  • 5.4.1. Pipe Temperatures
  • 5.4.2. Heat Exchangers: Detailed Options
  • 5.4.3. Bypass Channels
  • 5.4.4. Compressible Volumes
  • 5.4.5. Table Look-Up for Steam Generators or Intermediate Heat Exchangers
  • 5.4.6. Component-to-Component Heat Transfer
  • 5.4.7. RVACS/RACS Models
  • 5.4.8. Stratified Volume Model
• 5.5. Steam Generator
• 5.6. Air Dump Heat Exchanger
  • 5.6.1. Methodology
  • 5.6.2. Steady-State Solution
• 5.7. Cover Gas Flow and Pressure Calculations
  • 5.7.1. Introduction
  • 5.7.2. Basic Equations
  • 5.7.3. Solution
• 5.8. Overall Solution and Time Step Control
  • 5.8.1. Order of Calculation in PRIMAR
  • 5.8.2. PRIMAR Time Step Size
• 5.9. Steady-State Initialization
  • 5.9.1. Core Channels, Inlet Plenum, and Outlet Plenum
  • 5.9.2. Primary Heat Transport System
  • 5.9.3. Intermediate Heat Transport System
  • 5.9.4. Individual Components
  • 5.9.5. Null Transient for Steady-State Initialization
• 5.10. PRIMAR-1 Option
  • 5.10.1. Defined Pump Head
  • 5.10.2. Defined Flow Rate
• 5.11. Interaction With Other SAS4A/SASSYS‑1 Models
  • 5.11.1. Information Received by PRIMAR from Other Models
  • 5.11.2. Information Supplied by PRIMAR to Other Models
• 5.12. Subroutine Descriptions and Flow Charts
  • 5.12.1. Subroutine Listing and Description
  • 5.12.2. PRIMAR-4 Module Flow Chart
• 5.13. Input/Output Description
  • 5.13.1. Input Description
  • 5.13.2. Example of a Primary Loop
  • 5.13.3. Output Description
  • 5.13.4. Plotting PRIMAR-4 Data
• 5.14. References
• 5.15. Nomenclature
• 5.16. Appendices
  • 5.16.1. Appendix 5.1: IHX Matrix Coefficients
  • 5.16.2. Appendix 5.2: IHX Matrix Solution Algorithm
  • 5.16.3. Appendix 5.3: Cover Gas Flow and Pressure Algorithm
  • 5.16.4. Appendix 5.4: Air Blast Heat Exchanger Stack Momentum Equation
  • 5.16.5. Appendix 5.5: Interpolation from User-Supplied Tables
  • 5.16.6. Appendix 5.6: Optional Eulerian Solution for Pipe Temperatures
  • 5.16.7. Appendix 5.7: Detailed Derivation of EQ EM Pump