Analysis of SPERT reactivity transient by PARET Computer code

The purpose of this work is devoted to the analysis and the study of the SPERT reactivity insertion transient's tests by PARET model. The SPERT excursion power experiments offer an interesting opportunity to check the models and theories. In this sense, a coupled neutronics and core thermal-hydraulic PARET model has been used to perform the analysis of SPERT III experimental reactivity transients. In this framework, the series of step reactivity insertion tests made at the atmospheric pressure and ambient temperature are reproduced by PARET because they are representatives of research reactor operation conditions. The SPERT III-C tests under concern here are self-limited transients and no destructive tests are considered. It is of interest to consider cases where the specified scram is removed. PARET is a channel code based on a coupling of point kinetics, homogeneous 1-D, incompressible fluid and heat transfer and 1-D heat conduction. The results of PARET code are compared with the experimental data; this showed a satisfactory agreement; some of the discrepancies observed are discussed. (author)