1. User Group Meeting | 2017 | Jeju Island, Korea
FRAPCON/FRAPTRAN Users Group Meeting: Recent Code Release and Future Plans
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Ken Geelhood
Pacific Northwest National Laboratory
Richland, WA
November 14, 2018
User Group Meeting | 2017 | Jeju Island, Korea

2. User Group Meeting | 2017 | Jeju Island, Korea
Summary
Current code versions
Summary of Changes
FRAPCON-4.0
FRAPTRAN-2.0
Focus of Future Development
Next Code Release
November 14, 2018
User Group Meeting | 2017 | Jeju Island, Korea

3. User Group Meeting | 2017 | Jeju Island, Korea
Current Code Versions
FRAPCON-4.0
FRAPCON-4.0 patch 1
FRAPTRAN-2.0
November 14, 2018
User Group Meeting | 2017 | Jeju Island, Korea

4. Summary of Changes: FRAPCON-4.0
Extensive work has been done to modernize the FORTRAN language used for FRAPCON
Commons have been eliminated and variables are stored in modules for use in other subroutines
Code changed from fixed format to free format
More modern syntax has been employed for logic tests. Eg <, <=, ==, >=, > rather than lt, le, eq, ge, gt
All subroutines have been grouped into modules according to their function
Go to statements and if, then, else constructs have been replaced with CASE statements wherever possible
Need for compiler options has been eliminated
Double precision explicitly stated on all variables
All variables explicitly declared
Variables are dynamically dimensioned to the size of the current problem
No restriction on # of axial (na) or radial (nr, ngasr) nodes, no limit to the # of timesteps (im) or axial power profiles (up to im)
Code will be distributed with makefile for compiling on LINUX and OSX
November 14, 2018
User Group Meeting | 2017 | Jeju Island, Korea

5. Summary of Changes: FRAPCON-4.0 (cont.)
Code predictions from FRAPCON-4.0 are nearly identical to FRAPCON-3.5
Several bugs have been removed and models have been improved
Update to plenum temperature model
Update to gas properties
Several new capabilities have been added
Added the ANS-5.4 (2011) Standard Fission Product Release Model
“EM” options have been removed
Ability to model spent fuel storage using the DATING creep models added
Ability to use the ANS-5.1 decay heat model to calculate heating after shutdown added
Ability to specify axial coolant conditions (Temp, Press) was added
Various “Developer” options have been added to allow the user to change various model parameters for sensitivity study
These options have the potential to change the FRAPCON results such that the outputs are no longer validated
November 14, 2018
User Group Meeting | 2017 | Jeju Island, Korea

6. Summary of Changes: FRAPTRAN-2.0
Extensive work has been done to modernize the FORTRAN language used for FRAPTRAN
Commons have been eliminated and variables are stored in modules for use in other subroutines
Code changed from fixed format to free format
More modern syntax has been employed for logic tests. Eg <, <=, ==, >=, > rather than lt, le, eq, ge, gt
All subroutines have been grouped into modules according to their function
Go to statements and if, then, else constructs have been replaced with CASE statements wherever possible
Need for compiler options has been eliminated
Double precision explicitly stated on all variables
All variables explicitly declared
Variables are dynamically dimensioned to the size of the current problem
No restriction on # of axial (na) or radial (nr, ngasr) nodes, no limit to the # of timesteps (im) or axial power profiles (up to im)
Code will be distributed with makefile for compiling on LINUX and OSX
November 14, 2018
User Group Meeting | 2017 | Jeju Island, Korea

7. Summary of Changes: FRAPTRAN-2.0 (cont.)
Code predictions from FRAPTRAN-2.0 are nearly identical to FRAPTRAN 1.5
Several bugs have been removed and models have been improved
Update to void volume calculations
Changes to transient thermal solution proposed by Lars Jernkvist from Quantum Technologies was implements
Several new capabilities have been added
Water properties file not necessary
Option to select relocation model was added
Improved ability to link to TH codes
November 14, 2018
User Group Meeting | 2017 | Jeju Island, Korea

8. Summary of Changes: FRAPCON-4.0 and FRAPTRAN-2.0
Updates have been made to the Excel Auto Input Generator
All input variables are available to the user through this file
Tabs with required input are shown in red
Tabs with optional input for exercising various code options are shown in blue
Standard dimensions from various assembly designs are available to pre-populate input
Generator has been made dynamic (can continue as needed for axial variations, power history, coolant conditions, etc.)
Updates have been made to the Excel Plot File
Ability to plot an axial plot at a various time steps has been added to “1D data” tab
Surface plots in “2D data” tab improved
Ability added to plot axial and radial gas information added (nplot=2) e.g. gas in grains, grain boundary gas, produced gas
Ability to switch between British/SI units
November 14, 2018
User Group Meeting | 2017 | Jeju Island, Korea

9. Summary of Changes: FRAPCON-4.0 and FRAPTRAN-2.0 (cont.)
Updates have been made to the QA procedures
GitHub used for version control of source code
V&V cases established
Unit test cases. Separate driver program run subroutines to verify their performance relative to hand calculations
Verification test cases. Database of test cases is being established to test all code functionality
Validation test cases. Integral Assessment cases used to validate code predictions
Code change tracking tool implemented to assign, track, and document new code developments
FRAPVALID auto validation tool from IRSN implemented to assess the impact of new code modifications
Dakota scripts written for FRAPCON and FRAPTRAN uncertainty analyses
Modernization of assessment cases
November 14, 2018
User Group Meeting | 2017 | Jeju Island, Korea

10. Focus of Future Development
FRAPCON-FRAPTRAN Merger
FAST – Ian Porter will discuss later
Expand Code Assessments
Cladding creep
Fission gas release after short hold ramps
RIA
LOCA
Temperature of advanced fuels (Gd2O3, Doped fuel, IFBA)
Void volume
Cladding Corrosion
November 14, 2018
User Group Meeting | 2017 | Jeju Island, Korea

11. Focus of Future Development
Update or develop models as necessary based on assessments
Currently adding latest TUBRNP radial power profile module
Advanced model development
Improve FGR models
LOCA
Axial relocation
Axial extent of ballooning
Hydride reorientation
Create training materials
Advanced Reactors/ATF
FRAPCON already shown to be applicable to NuScale SMR
Adding current best properties for ATF fuels and cladding
Preparing to add module to solve alternate geometries
November 14, 2018
User Group Meeting | 2017 | Jeju Island, Korea

12. User Group Meeting | 2017 | Jeju Island, Korea
Next Code Release
Plan to release FAST by September 2018
November 14, 2018
User Group Meeting | 2017 | Jeju Island, Korea