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Validation of Coupled Neutronic / Thermal-Hydraulic Codes for VVER Reactors VALCO

Project ID: FIKS-CT-2001-00166
Funded under: FP5-EAECTP C


The VALCO project aims at the improvement of the validation of coupled neutron-kinetic / thermal-hydraulic codes for VVER reactors. VALCO was started January 1, 2002 and was completed June 30, 2004.
A major objective of VALCO was to study the ability of codes to model the NPP behaviour in different types of transients. For this reason in work package 1 (WP 1), the existing data base, containing already measured VVER transient data from the former EU Phare project SRR-1/95, has been extended by five new transients. Two of these transients ‘Drop of control rod at nominal power at Bohunice-3' of VVER-440 type and ‘Coast-down of 1 from 3 working MCPs at Kozloduy-6' of VVER-1000 type, were then utilised for code validation. Eight institutes contributed to the validation with ten calculations using five different combinations of coupled codes. The thermal-hydraulic codes were ATHLET, SMABRE and RELAP5 and the neutron kinetic codes DYN3D, HEXTRAN, KIKO3D and BIPR-8. The general behaviour of both the transients was quite well calculated with all the codes.

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