The 5th International Symposium on SuperCritical Water-cooled Reactors - 2011 March 13-16

Presented at:
The 5th International Symposium on SuperCritical Water-cooled Reactors
2011 March 13-16
Session Title:
Core Design

Csaba Maráczy (Hungarian Academy of Sciences )
György Hegyi (Hungarian Academy of Sciences )
Gábor Hordósy (Hungarian Academy of Sciences )
Emese Temesvári (Hungarian Academy of Sciences )


The High Performance Light Water Reactor (HPLWR) is the European version of the various supercritical water cooled reactor proposals. The paper presents the activity of KFKI-AEKI in the field of neutronic core design within the framework of the "HPLWR Phase 2" FP-6 and the Hungarian “NUKENERG” projects. As the coolant density along the axial direction shows remarkable change, coupled neutronic- thermohydraulic calculations are essential which take into account the heating of moderator in the special water rods of the assemblies. A parametrized diffusion cross section library was prepared for the HPLWR assembly with the MULTICELL neutronic transport code. The parametrized cross sections are used by the KARATE program system, which was verified for supercritical conditions by comparative Monte Carlo calculations. To design the HPLWR equilibrium core preliminary loadings were assessed, which contain insulated assemblies with Gd burnable absorbers. The fuel assemblies have radial and axial enrichment zoning to reduce hot spots.

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