This report describes the results of the fourth round robin exercise organized by the IAEA for the LWR fuel behaviour codes. The previous exercise was organized by the IAEA in 2002-2007. ITU contributed to the IAEA FUMEX-II co-ordinated research project (CRP) by (a) The development of a high burn-up TRANSURANUS-WWER Version, (b) Verification of the TRANSURANUS-WWER Version for WWER-1000 reactors, (c) Further verification of the TRANSURANUS Code by selected irradiations from the IFPE Database, (d) Transfer of latest ITU knowledge in the following areas: high burnup effects and MOX behaviour as far as confidentiality is not concerned. Within the FUMEX-III project this work continues by (a) Knowledge transfer and release of the TRANSURANUS code to safety authorities in several neighbouring countries of the European Union (b) Further verification of the TRANSURANUS Code by selected irradiations from the IFPE Database: extending the verification of the TRANSURANUS code on the basis of the cases related to the behaviour of high burnup UO2 fuel, Gd-containing UO2 fuel and MOX fuel under normal operating conditions in LWRs, including WWER. The simulation of the pellet-cladding mechanical interaction received particular attention, (c) Extending the TRANSURANUS code for simulation of fuel rods under accidental conditions, such as a loss of coolant accidents (LOCA) and a Reactivity Initiated Accident (RIA), for which various code improvements have been implemented and other changes are still under development.

VAN UFFELEN Paul;  SCHUBERT Arndt;  VAN DE LAAR Jacques;  DI MARCELLO Valentino; 

2013-08-20

IAEA

JRC68978

http://www-pub.iaea.org/MTCD/Publications/PDF/TE-1697_CD/Start.pdf,    https://publications.jrc.ec.europa.eu/repository/handle/JRC68978,