Experimental analysis of heaping and self-levelling phenomena in core debris using lead spheres

Sudha, A. Jasmin; Murthy, S. Srinivasa; Kumaresan, M.; Lydia, G.; Nashine, B.K.; Chellapandi, P.

doi:10.1016/j.expthermflusci.2015.04.022

Cited by 10 publications

(6 citation statements)

References 8 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aimed at phenomenologically understanding the fundamental characteristics of DBF behavior, some pioneering simulated experiments by using water and single-sized and single-shaped solid particles to simulate sodium coolant and debris were conducted by Shamsuzzaman et al [23,29,62,63] and Sudha et al [65], concentrating on the overall accumulated-bed characteristics. Table 1 shows the comparison of material proprieties.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

“…The characteristics of the accumulated bed formed after DBF behavior are crucial to the subsequent evaluation of debris bed heat removal. In IGCAR, experiments were conducted with high-density lead particles to develop an empirical model for predicting the repose angle of the formed debris bed [65]. At Kyushu University and JAEA, by employing single (i.e., single-sized and single-shaped) solid particles and mixed solid particles, some typical experimental parametric impacts on the overall accumulated-bed characteristics (e.g., bed height and shape) were clarified [23,28,29,[62][63][64].…”

Section: Investigations Focusing On Overall Accumulated-bed Character...mentioning

confidence: 99%

“…Therefore, to elucidate the characteristics and mechanisms of DBF behavior in the case of an SFR, in the past decade, extensive experimental and modeling studies were performed separately at Kyushu University, the Japan Atomic Energy Agency (JAEA) [23,28,29,[62][63][64], Indira Gandhi Centre for Atomic Research (IGCAR) [65], and Sun Yat-Sen University (SYSU) [24,[66][67][68][69][70][71][72]. Figure 2 summarizes these investigations, which can be divided according to their different focal points: (1) investigations focusing on the overall accumulated-bed characteristics; and (2) investigations focusing on the flow regime characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Solid particles were discharged into the water pool from the top by gravitation through a nozzle and accumulated at the bottom to form the particle bed. In the investigations focusing on the overall accumulated-bed characteristics [24,29,30,[63][64][65][66], single-sized particles and mixed-sized solid particles in a range of 1.1~6.0 mm were employed, and some key parameters (e.g., particle type, nozzle height, and nozzle diameter) were quantitatively studied based on inter-particle interactions. It was found that concave or conical accumulated beds may be formed during DBF, dependent on the experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the different formation mechanisms of these flow regimes, an empirical model was developed to predict the DBF flow regime transitions, and its predictability was further extended owing to the knowledge accumulated from the experiments under more realistic conditions (e.g., mixed-sized particles and sodium boiling situations). [23,[28][29][30]41,[61][62][63][64][65]73] and flow-regime characteristics [24,[67][68][69][70][71][72].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Cheng

2023

Applied Sciences

View full text Add to dashboard Cite

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.

show abstract