Recent IRSN work on FRAPCON-3 V Busser, IRSN 1

- A post-processing tool FRAPOST adapted for LINUX environment FRAPCON-3 2012-2014 First developments based on FRAPCON-3.4a Tool FRAPVALID and FRAPCON-3.4a developments delivered to US NRC in November 2013 - Migration of the FRAPCON code to a LINUX environment (compile, run, post-process) - A post-processing tool FRAPOST adapted for LINUX environment Development of an automatic tool (FRAPVALID) in order to assess the code. This tool consists in a launcher of the test-cases and an automatic procedure to extract FRAPCON results and integrate them in a pdf report.

FRAPCON-3 New outputs that can now be plotted (in addition to those already existing) for each FRAPCON-3 calculation. (option nplot=2 in the input data file and use of the FRAPOST tool) $frpcn im=48, nr=17, ngasr=45, na=9 $end $frpcon dco=0.374, thkcld=0.0225, thkgap=0.00325, totl=12, cpl=6.3386 dspg=0.3189, dspgw=0.0394, vs=30 hplt=0.387, rc=0, hdish=0.0094, dishsd=0.064 enrch=4.5, imox=0, comp=0 fotmtl=2, gadoln=0, ppmh2o=0, ppmn2=0 den=95.5, deng=0, roughf=0.0000787, rsntr=100, tsint=2911 icm=6, cldwks=0.5, roughc=0.0000197, catexf=0.05, chorg=10 fgpav=340.84, idxgas=1 iplant=-2, pitch=0.4291, icor=0, crdt=0, crdtr=0, flux=10*22100000000000000 crephr=10, sgapf=31, slim=0.05, qend=0.3 jdlpr=1, nopt=0, nplot=2, ntape=0, nread=0, nrestr=0 ProblemTime= 50, 100, 150, 200, 250 (…)

FRAPCON-3 New outputs that can now be plotted (in addition to those already existing) ---------------------------------------------------------------- 1 Time 2 Average Power 3 Fuel Stack Axial Extension 4 Cladding Axial Extension _Including Irrad Growth_ 5 Plenum Gas Temperature 6 Plenum Pressure 7 Total Void Volume 8 Average Fuel Temperature 9 Fuelled Region Stored Energy 10 Rod Average Burnup 11 Fission Gas Release 20 Peak Linear Heat Rating 21 Molar Fraction of He 22 Molar Fraction of Pf_Xe+Kr_ 23 Molar Fraction of Air 24 Molar Fraction of Ar 25 Free gas in the rod cm3TPN 26 Lower Plenum Temperature 27 Lower Plenum Volume 28 Upper Plenum Temperature 29 Upper Plenum Volume 30 Stoechiometry 31 Fuel Grain size 116 Surface Heat Flux 117 Coolant Density 118 Coolant Mass Flux 119 Coolant Pressure 121 Stored Energy 122 Fuel Centerline Temperature 123 Fuel Pellet Surface Temperature 145 Fuel Volume Average Temperature 124 Cladding Inside Temperature 125 Cladding Average Temperature 126 Cladding Outside Temperature 139 Oxide Surface Temperature 127 Bulk Coolant Temperature 128 Fuel Surface Displacement 129 Gap Gas Pressure 130 Axial Power 131 Gap Interface Pressure 133 Fuel Surface Axial Strain 136 Cladding Elastic Hoop Strain 137 Cladding Elastic Axial Strain 138 Cladding Elastic Radial Strain 141 Nodal FGR 142 Nodal Burnup …… 32 End of life Plenum Pressure 33 Relative Cladding Axial Extension 34 Peak Axial Element Indicator 35 Rod Peak Burnup 36 Peak Pellet CenterLine Temperature 37 Peak Pellet Surface Temperature 38 Peak Clad Inside Temperature 39 Peak Clad Outside Temperature 40 Relative Fuel Axial Extension ---------------------------------------------------------------- 101 Cladding Axial Strain 102 Cladding Hoop Strain 103 Cladding Radial Strain 104 Cladding Perm Axial Strain 105 Cladding Perm Hoop Strain 106 Cladding Perm Radial Strain 107 Cladding Axial Stress 108 Cladding Hoop Stress 109 Effective Cladding Stress 112 Structural Radial Gap 146 Gap Conductance 114 Fuel Duty Index 115 ZIRLO_TM_ Oxide Thickness 140 ZIRLO_TM_ Hydrogen Concentration

FRAPCON-3 Opportunity to perform comparison of results obtained with different versions. Comparison between experimental data and calculation results

FRAPCON-3 May 2014: New version FRAPCON-3.5 has been released. IRSN included developments performed on FRAPCON-3.4a in the newest version FRAPCON-3.5. US NRC tested the FRAPVALID tool and IRSN helps for use FRAPCON-3.5 adapted by IRSN LINUX environment, post-processing tool Modification of the FRAPVALID tool for the assessment of the code

FRAPCON-3 IRSN add some ramp data in order to enrich the assessment database of the code. Example :

FRAPCON-3 The FRAPOST and FRAPVALID tool based on FRAPCON-3.5 were released to US NRC in 2015. IRSN will now perform studies based on the code for “French” application: base irradiation evaluation (previous step before RIA application with SCANAIR code), ramp test calculations, thermal-mechanical evolution of the rod for reactor maintained at intermediate power during extended duration (e. g. ELPO)… IRSN will start in the next months a definition of the strategy for a Storage/Transportation version of FRAPCON, including models to be considered for hydriding, oxidation, creep, hydrogen diffusion, hydride reorientation… ? IRSN will participate to the NEA/OCDE Benchmark on Ramp Tests with FRAPCON-3 or 4