ESFR-SMART belongs to the family of Gen-IV sodium cooled reactors. For its safety performance demonstration the detailed knowledge of selected safety related parameters is required. It is very important to know not only their spatial distribution and amplitude but also their mutual interdependence. In this paper the sodium void effect, the Doppler effect and fuel and cladding density effects were analyzed. The ERANOS 2 code was applied for the analysis of detail mapping of these effects and of the mutual influence between the effects. For each of the effect and for each of the interdependency many direct calculation were accomplished.
It was found that the void effect alone is spatially additive in the active zone, but not in the sodium plenum above the core. Especially the top fuel zone is strongly influenced by sodium plenum and vice versa. Furthermore, there is difference between radial and axial additivity of the void effect.
The Doppler effect alone is practically additive in the core. The interdependence of void and Doppler effect is limited, but not negligible. Other studied effects were related to fuel and cladding density change and they are spatially additive in the core. Finally, the results of this study can be used to recommend an approach of ESFR-SMART core modeling during transient analysis.
|Affiliation/Organization||Paul Scherrer Institut|
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