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Report No.

Scaling-up capabilities of TRACE integral reactor nodalization against natural circulation phenomena in small modular reactors

Mascari, F.*; Bersano, A.*; Woods, B. G.*; Reyes, J. N.*; Welter, K.*; Nakamura, Hideo  ; D'Auria, F.*

Safety analyses have a key role for designing the mitigation strategies and for a safety review process, which are carried-out with best-estimate thermal-hydraulic system codes. Small Modular Reactors (SMRs) adopting passive mitigation strategies under development are characterized by some common features with the current reactors and by other features typical of their designs. While many of Natural Circulation (NC) have been studied, further analyses are necessary to confirm the code capability against experimental data representative of SMR phenomenology. Though different scaling methods have been developed, distortions are unavoidable in the experimental facility design. Then, scaled-down facilities are limited in scaling-up capabilities, which may affect the capability of the code to predict full-scale behavior. Therefore, in a V&V process, uncertainty related to the code scaling-up capability is still an open issue. Since the OSU-MASLWR is scaled in volume and height, this paper aims to assess the scaling-up capability of the OSU-MASLWR Reactor Pressure Vessel nodalization against NC phenomenology typical of SMR, having the OSU-MASLWR-002 single phase NC data as a base. This may give some first insights about the TRACE scaling-up capability against single-phase NC in integral type configuration.



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