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

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Presentation on theme: "FRAPCON/FRAPTRAN Users Group Meeting: Recent Code Updates and Future Plans Ken Geelhood Walter Luscher Carl Beyer Pacific Northwest National Laboratory."— Presentation transcript:

1 FRAPCON/FRAPTRAN Users Group Meeting: Recent Code Updates and Future Plans Ken Geelhood Walter Luscher Carl Beyer Pacific Northwest National Laboratory September 7,

2 Outline 2 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 Upcoming Activities Next Code Release

3 Current Code Versions 3 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: The ongoing development of FRAPCON-3 and FRAPTRAN is sponsored by the U.S. NRC

4 Changes Made to Date: FRAPCON Model improvements Model for gaseous swelling added to better predict cladding hoop strain during high burnup ramp tests 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 Error correction Better error messages were added to help debug input file Default values in manual and code were matched

5 FRAPCON-3.5 model Improvements: Gaseous Swelling 5 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

6 FRAPCON-3.5 model Improvements: Gaseous Swelling 6 New model improves predictions of ramp hoop strain at high burnup

7 Changes Made to Date: FRAPTRAN 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 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

8 FRAPTRAN 1.5 model Improvements: Ballooning Model 8 More strain values are output to FRAPTRAN Thinned cladding used to calculation ECR Increased diameter used to calculation metal water reaction energy

9 FRAPTRAN 1.5 model Improvements: ID Oxidation 9 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

10 Changes made to Date: Uncertainty Analysis with FRAPCON-ARM 10 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.

11 Uncertainty Analysis with FRAPCON-ARM Input 11

12 Uncertainty Analysis with FRAPCON-ARM Input 12

13 Uncertainty Analysis with FRAPCON-ARM Output 13 Calculated Upper Tolerance Limits Output distributions Inputs and outputs for each realization

14 Uncertainty Analysis with FRAPCON-ARM Output 14 Output vs. Input Test for Normality

15 Recent Code Benchmarks 15 IFA-699 Subject: Creep Presented at: 2011 EHPG Meeting 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

16 Upcoming Changes: FRAPCON Model improvements Updates to implementation of creep model in FRAPCON Updates to better predict BOL temperatures New Capabilities Axial variation in enrichment Axial variation in Gd 2 O 3 content Ability to specify axial regions with and without a central hole 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

17 Upcoming Changes: FRAPTRAN Review of FLECHT reflood correlations in code and comparison to FLECHT data set Ability to model pellets with chamfers Excel input generator updates and improvements to match FRAPTRAN 1.5 changes Possible support of SNAP within 1-2 years

18 Upcoming Activities 18 Peer Review Need at least five members of Users Group Peer review should identify: Code deficiencies Suggestions for code improvements Peer review will begin shortly following this meeting Sign up now to participate Other members will be contacted by

19 New Code Release 19 Plans to release FRAPCON-3.5 and FRAPTRAN 1.5 early 2014 Documentation? NUREG/CR? Web documentation?


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