Recent FRAPCON and FRAPTRAN activity at VTT You can use cover page with one or two photos or without photos FRAPCON/FRAPTRAN Users’ Group Meeting 2015 Ville Tulkki

Recent FRAPCON and FRAPTRAN activity at VTT Statistical estimation of number of failed rods in EPR large break LOCA And continued analysis Assessment of FRAPCON uncertainty and sensitivity Development of GENFLO-FRAPTRAN Several instances of FRAPTRAN in a single flow channel Application to assembly flow blockage in BWR Several LOCA experiment analysis as part of FUMAC Halden VVER experiment AEKI burst experiments Benchmarking of FINIX against FRAPCON and FRAPTRAN

Review of the results showed several mistakes / bugs Actual number of failed rods was 14 in worst case

Further investigation on the reason of the simulated failures (soon to be published)

Uncertainty analysis of base irradiation case with FRAPCON-3.4 Sensitivity studies using Sobol’ variance decomposition

GENFLO-FRAPTRAN Thermal hydraulic code GENFLO modified to run simultaneously several instances of FRAPTRAN 2013 Case study to investigate flow blockage in a BWR 2014

Relatively benign behaviour at low blockage ratios, harshest case (90%) shown

TECHNOLOGY FOR BUSINESS Final slide is optional in VTT’s internal presentations