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FRAPCON/FRAPTRAN Users Group Meeting: Recent Code Updates and Future Plans

FRAPCON/FRAPTRAN Users Group Meeting: Recent Code Updates and Future Plans. Ken Geelhood Walter Luscher Carl Beyer Pacific Northwest National Laboratory September 19, 2013. Outline. Current code versions Changes made so far FRAPCON-3.5 FRAPTRAN 1.5 FRAPCON-ARM Recent code benchmarks

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FRAPCON/FRAPTRAN Users Group Meeting: Recent Code Updates and Future Plans

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  1. FRAPCON/FRAPTRAN Users Group Meeting:Recent Code Updates and Future Plans Ken Geelhood Walter Luscher Carl Beyer Pacific Northwest National Laboratory September 19, 2013

  2. Outline • Current code versions • Changes made so far • FRAPCON-3.5 • FRAPTRAN 1.5 • FRAPCON-ARM • Recent code benchmarks • Upcoming Changes • FRAPCON-3.5 • FRAPTRAN 1.5 • Changes beyond these versions • Next Code Release

  3. Current Code Versions • FRAPCON-3.4a • Code Description: NUREG/CR-7022 Vol.1 • Integral Assessment: NUREG/CR-7022 Vol.2 • FRAPTRAN 1.4 • Code Description: NUREG/CR-7023 Vol.1 • Integral Assessment: NUREG/CR-7023 Vol.2 • Consistent material properties in both codes • Material Property Correlations: NUREG/CR-7024 Documentation available on: http://frapcon.labworks.org/ • The ongoing development of FRAPCON-3 and FRAPTRAN is sponsored by the U.S. NRC

  4. Changes Made to Date:FRAPCON-3.5 • Model improvements • Model for gaseous swelling added to better predict cladding hoop strain during high burnup ramp tests • Improved primary creep model • Improved beginning of life temperature predictions • New Capabilities • Ability to model pellets with chamfers was added • Ability to input variable axial node lengths was added • More output was added for stochastic analysis • Axial variation of enrichment, gadolinia, and central hole • More time steps, nodes, and axial shapes allowed • Gadolinia assumption evaluated • New model for swelling • User guidance developed

  5. Changes Made to Date:FRAPCON-3.5 • Error correction • Better error messages were added to help debug input file • Default values in manual and code were matched

  6. FRAPCON-3.5 model Improvements:Gaseous Swelling • Gaseous swelling observed between 960˚C and 1832˚C • Model is linearly phased in between 40 and 50 GWd/MTU and fully applied above 50 GWd/MTU

  7. FRAPCON-3.5 model Improvements:Gaseous Swelling • New model improves predictions of ramp hoop strain at high burnup

  8. FRAPCON-3.5 model Improvements:Improved Primary Creep • New model improves prediction of primary creep following stress reversals and stress changes

  9. FRAPCON-3.5 model Improvements:Axial Variations • User may input custom axial node lengths • For each axial node, the user may input a different value of • Enrichment • Gadolinia concentration • Presence or absence of central hole • Size of central hole • Old input of equal length axial nodes and constant values for all nodes still work

  10. Changes Made to Date:FRAPTRAN 1.5 • Model improvements • Changes made to how the code does ballooning calculations • Double sided oxidation changed • New Capabilities • Number of input coolant zones changed from 10 to 20 • Interpolate between input coolant zones for axial nodes • Ability to specify an external plenum volume • Maximum number of axial nodes changed from 25 to 150 • Different values of gadolinia for each node • Ability to model chamfers

  11. Changes Made to Date:FRAPTRAN 1.5 • Error correction • Lower bound for Cathcart/Pawel model changed from 1000K to 1073K • Errors in heat transfer correlations corrected • Better error messages were added to help debug input file • Default values in manual and code were matched • Error in fill gas composition after rupture • Review of FLECHT reflood correlation performed

  12. FRAPTRAN 1.5 model Improvements:Ballooning Model • More strain values are output to FRAPTRAN • Thinned cladding used to calculation ECR • Increased diameter used to calculation metal water reaction energy

  13. FRAPTRAN 1.5 model Improvements:ID Oxidation • New options added • FRAPTRAN 1.4 • ID oxidation only calculated in burst area after burst • FRAPTRAN 1.5 • Option to calculate ID oxidation one of two ways • FRAPTRAN 1.4 method -or- • Calculate for all nodes regardless of burst if nodal burnup exceeds value set by user

  14. Changes made to Date:Uncertainty Analysis with FRAPCON-ARM • Stochastic framework capable of running many realizations of FRAPCON-3.4 varying: • Manufacturing uncertainties • Model uncertainties • Power uncertainties • Package reads data from each realization and compiles distributions for each output of interest. • Allows staff to validate vendor predictions of nominal and upper tolerance limit for various code outputs. • Methodology does not rely on assumptions of normality for input or output distributions as the RMS methods typically used in industry do.

  15. Uncertainty Analysis with FRAPCON-ARMInput

  16. Uncertainty Analysis with FRAPCON-ARMInput

  17. Uncertainty Analysis with FRAPCON-ARMOutput • Calculated Upper Tolerance Limits • Output distributions • Inputs and outputs for each realization

  18. Uncertainty Analysis with FRAPCON-ARMOutput • Output vs. Input • Test for Normality

  19. Recent Code Benchmarks • IFA-699 • Subject: Creep • Presented at: 2011 EHPG Meeting and 2013 TopFuel • SCIP, TRANS RAMP IV • Subject: FGR during short hold time ramps • Presented at: Not publically presented • Hydrogen pickup models • Presented at: 2011 Water Reactor Fuel Performance Meeting • IRSN RIA Benchmarks • High burnup RIA tests • FUMEX-III • Participated with TRACTEBEL and NRI

  20. Upcoming Changes:FRAPCON-3.5 • New Capabilities • Improved ability to model refabricated rodlets • Model base irradiation and create restart file • Model test on refabricated rod using selected axial nodes from restart • Excel input generator updates and improvements to match FRAPCON-3.5 change • Possible support of SNAP within 1-2 years

  21. Upcoming Changes:FRAPTRAN 1.5 • Excel input generator updates and improvements to match FRAPTRAN 1.5 changes • Possible support of SNAP within 1-2 years

  22. Changes beyond FRAPCON-3.5 and FRAPTRAN 1.5 • FORTRAN Updates • Use all Modern F95 • Reduce need for compiler options • Improve variable declaration and use dynamic dimensioning • Improvement in reliability • Reduce crashes • Retune FRAPFGR model • Fix FRAPTRAN problems with coolant boundary conditions • Address peer review items • Couple FRAPCON and DATING for spent fuel creep analysis • Develop stochastic capability for FRAPTRAN • Include new ANS5.4 model in FRAPCON • Update decay heat model

  23. New Code Release • Plans to release FRAPCON-3.5 and FRAPTRAN 1.5 early 2014 • Documentation • NUREG/CR

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