1. FRAPCON/FRAPTRAN activity at VTT
FRAPCON users group meeting V. Tulkki, A. Arffman VTT Technical Research Centre of Finland

2. Code use at VTT
Past activity
Current and near-future projects

3. Recent Projects
Simulation of past Halden LOCA tests in cooperation with Quantum Technology (Sweden) [1]
VTT uses FRAPTRAN-GENFLO for reference calculation and TH boundary conditions for QT’s modified FRAPTRAN calculations
Ongoing for IFA >
Simulation of Halden VVER LOCA test IFA
Rupture location and time well replicated, however
Difficulty to replicate temperature evolution after the rupture (similar effect in some other LOCA tests too)
[1] Tero Manngård, Ali Massih, Jan-Olof Stengård, Evaluation of the Halden IFA-650 loss-of-coolant accident experiments 2, 3 and 4,

5. Recent Projects Statistical full-core LOCA evaluation
Presented in TopFue l2011 [2]
Upgrading of FRAPTRAN-GENFLO TH coupling for boundary conditions allowing for total channel emptying and downwards flow
LOCA conditions in large reactors quite harsh
FRAPCON used in SCANAIR initialization [3]
Initialization module by IRSN
Interpretation of gap during RIA
[2] 2011 Water Reactor Fuel Performance Meeting, paper T3-028
[3] A. Arffman, A. Moal, Georgentum, V, Evaluation and Adaptation of the RIA code SCANAIR for modelling BWR fuel and conditions, TopFuel 2012

6. Current situation and future issues
Tradition of keeping our own modified version
Major modifications presented in users group meeting adjanced to Topfuel 2010
Our person responsible for FRAPTRAN and FRAPCON maintenance is about to retire
Knowledge transfer ongoing
LOCA damaged rod estimation for EPR still a current issue
<10% rods damaged in LBLOCA
Participation in OECD uncertainty analysis in best estimate modelling (UAM) workshop with both FRAPCON and ENIGMA codes
Enhancing our capability for uncertainty estimations

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