Transcript Recent FRAPCON and FRAPTRAN work at VTT

Recent
FRAPCON and FRAPTRAN
activity at VTT
Users group meeting
V. Tulkki
VTT Technical Research Centre of Finland
17/07/2015
Recent FRAPCON & FRAPTRAN use at VTT
 Statistical studies
 OECD/NEA benchmark on uncertainty analysis of best
estimate modelling of light water reactors
 Support to STUK
 EPR LBLOCA
 Halden LOCA experiment simulations
 FRAPTRAN-GENFLO bundle simulations
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Statistical studies
 FRAPCON used for a statistical study on input
interactions
 Sobol’ variance decomposition used in analysis
 Provides information on higher order interactions
 Downside: ~106 FRAPCON runs
 Traditional first-order ranking methods commonly
used in sensitivity analysis not always sufficient
due to complex interactions
 Discussed in OECD/NEA UAM workshops and
Halden uncertainty workshop this fall
 ”The importance of input interactions in the
uncertainty and sensitivity analysis of the nuclear
fuel behavior”, T. Ikonen and V. Tulkki, submitted
to Nuclear Engineering and Design
 Work continues with FRAPTRAN analysis
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LBLOCA
 Comparative analysis for STUK on number of failed rods during EPR
LBLOCA
 Regulatory requirement <10%
 For reference / information to STUK, not part of official process
 System code APROS used for 59 global simulations of plant state
 59x1000 FRAPTRAN/GENFLO subchannel analysis used with local
variations
 Results extended to whole core with neural networks
 -> fraction of failed rods
 Work in progress
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 Study on impact of variation of heating power for future Halden LOCA test
 Also, simulation of the effect of spacer grid simulation
 Should be implementable in the FEA model
 Extension of FRAPTRAN/GENFLO hot channel mode to bundle model
with several concurrent FRAPTRAN simulations
 Coupling of FRAPCON to Serpent 2 MC reactor physics code via
universal multiphysics interface
 Use of FRAPTRAN for benchmarking our FINIX fuel module
 FINIX initialization from FRAPCON restart
 FRAPTRAN to be used in IAEA CRP FUMAC and possibly OECD RIA
phase II benchmark
17/07/2015
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