摘要：

A comparison is presented bitMU experimental results and COMETHE III-L fuel rod behaviour predictions. the first part of the paper focuses on —chemical aspects, with as sola experiments, AECL 3C-26A and Studsvik Iaterrmmp. The second part presents the results of a wide FGE benchmarking cam-paign, with a rafarenea co previous COMEIHE versions. It appears that the vari-ance between experiment sad calculation has decreased by a factor four when the III-J version was improved into the III-L version. As conclusion, soaa CQHEXRE Ill-i. calculations are presented is order co illustrate its capability of predicting fuel red performance Halts. I. IST50PDC7I0K. Modal benchmarking has continuously received much attention during the development of the successive versions of COMETHE. The gradual increase of the benchmarking data base makes however the benchmarking mere and more stringent : indeed, the data base increase is not only a question ef size, but maybe mora an increase la complexity due to the mere accurate foal red duty records as wall as more sophisticate post-irradiation techniques and pre—irradiation characterisa-tion. Also, interest in experiments related to the performance limits of fuel red, un-der both operationoal or incidental transients has lad co the efflorescence of many specific international programs as e.g. the Scudswlk Interramp program [1] dedicated to BUI red rasping or the Tribulation program (2] testing Pint reds un-der class 2 overpower transients. Is addition, sura safety experiments par formed in specialized facilities like PIF [3] still increase the complexity of the data. Models are thus facing the challenge co provide correct predictions against as ever increasing variety of observed experimental behaviours.

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