From melt jet break-up to debris bed formation: A review of melt evolution model during fuel-coolant interaction

Sun, Ruiyu; Wu, Liangpeng; Ding, Wen; Chen, Ronghua; Tian, Wenxi; Qiu, Suizheng; Su, G.H.

doi:10.1016/j.anucene.2021.108642

Cited by 21 publications

(1 citation statement)

References 104 publications

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“…Here, it should also be noted that in the context of the severe accidents of LWRs, the debris bed formation behavior was widely investigated with the aim of evaluating the debris bed coolability and subsequent Molten Core-Concrete Interaction (MCCI) [41,[51][52][53][54][55][56], and many valuable findings were attained from these studies. However, due to the different thermal and hydraulic interactions made between the coolant and discharged molten core materials, it was found that the breakup and fragmentation of the discharged molten jet would be facilitated in SFRs because of the higher heat transfer between the two phases resulting from the direct liquid-liquid contact [27,[57][58][59][60].…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Mechanisms of Debris Bed Formation Behavior in Severe Accidents of Sodium-Cooled Fast Reactors: Experimental and Modeling Studies

Cheng

2023

Applied Sciences

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A Sodium-cooled Fast Reactor (SFR) is one of the optimized candidates in Generation IV nuclear reactor systems, but safety is an essential issue for SFR development and application. Most knowledge was accumulated through SFR safety investigations, especially for Core Disruptive Accidents (CDAs). During the CDA of SFRs, the molten materials in the core region are likely to discharge into subcooled sodium and form a debris bed on the lower region of the reactor vessel. Noticing that elaboration on the characteristics and mechanisms of Debris Bed Formation (DBF) behavior should be essential for the subsequent analysis of debris bed coolability and accident progression through various experimental and modeling studies, much knowledge was obtained during the past decades. Motivated to promote future investigations on CDAs of SFRs, the previous experiments and modeling studies on DBF behavior are systematically reviewed and discussed in this paper. The experimental results showed that the flow-regime and accumulated-bed characteristics during DBF were influenced by varying parameters and realistic conditions. Through the modeling studies, several empirical models were proposed for predicting the flow regime and accumulated-bed characteristics in DBF. In addition, to promote further development of research, the future prospects concerning DBF behavior are also described.

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