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

2. - A post-processing tool FRAPOST adapted for LINUX environment
FRAPCON-3
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.

3. 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= , 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= , rsntr=100, tsint=2911
icm=6, cldwks=0.5, roughc= , catexf=0.05, chorg=10
fgpav=340.84, idxgas=1
iplant=-2, pitch=0.4291, icor=0, crdt=0, crdtr=0, flux=10*
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 (…)

4. 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

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

6. 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

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

8. 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