Uncertainties of the KIKO3D-ATHLET Calculations Using the Kalinin-3 Benchmark (Phase II) Data
25th Symposium of AER on VVER Reactor Physics and Reactor Safety (2015, Balatongyörök, Hungary)
Reactor dynamics and safety analysis, CFD
Abstract
Some years ago an OECD NEA benchmark for Kalinin-3 VVER-1000 NPP was set up.
Recently the Kalinin-3 benchmark has been merged into the OECD NEA UAM benchmark.
The objective of the OECD NEA Uncertainty Analysis in Best-Estimate Modeling (UAM)
LWR benchmark is to determine the uncertainties of the coupled reactor physics/thermal
hydraulics LWR calculations at all stages. At the final stage, one of the problems to be
analyzed is the Kalinin-3 benchmark problem from the point of view of the uncertainties in
case of VVER reactors.
In this paper the uncertainties of the KIKO3D-ATHLET calculations at core level are
presented using the Kalinin-3 (Phase II) benchmark data, although only the neutronic
uncertainties are considered and further simplifications are applied and discussed.
In the first part of the paper, the uncertainties (empirical standard deviations and correlations)
of the effective multiplication factor, the assembly-wise radial power distribution, the axial
power distribution, the rod worth, etc. are presented at steady-state. After that the
uncertainties of the transient calculations are discussed for the considered switch-off of one
MCP type transient.
1. INTRODUCTION
The OECD NEA Kalinin-3 benchmark 1 is about a switch-off of one Main Circulation
Pump (MCP) at nominal power and for this real transient measured data are also available.
This benchmark is calculated by the KIKO3D-ATHLET coupled code at MTA EK (for phase
II see e.g. 2) and it was discussed by other participants of AER during the last years, see e.g.
[3, 4], as well.
Recently the Kalinin-3 benchmark has been merged into the OECD NEA UAM benchmark
5. The objective of the OECD NEA Uncertainty Analysis in Best-Estimate Modeling
(UAM) LWR benchmark is to determine the uncertainties of the coupled reactor
physics/thermal hydraulics LWR calculations at all stages. At the final stage, one of the
problems to be analyzed is the Kalinin-3 benchmark problem from the point of view of the
uncertainties in case of VVER reactors.