本书作为国内钠冷快堆严重事故领域的第一本学术专著，主要对第四代核能系统中的钠冷快中子反应堆堆芯解体事故中颗粒床相关现象的研究进行系统性地归纳和整理。本书凝聚了著者及相关国际同行多年来在本领域的研究成果，主要内容包括：引论（第四代核能系统、钠冷快中子反应堆、快堆严重事故及严重事故中颗粒床相关现象的背景概况）、熔融池内颗粒床相关现象（熔融池的流动性和熔融池的晃动特性）、主容器内堆芯捕集器上碎片床相关现象（碎片床形成行为及碎片床自动变平现象）以及结论和展望等。
本书既可作为钠冷快堆严重事故领域相关专家、学者和研究生的参考书籍，也可为从事铅冷快堆和轻水堆严重事故分析的同行提供借鉴。

Chapter 1 Introduction
1.1 Generation-IV Nuclear Reactor Systems
1.2 Sodium-Cooled Fast Reactors
1.2.1 Development history and current situation of SFRs
1.2.2 System characteristics of SFRs
1.3 SFR Safety Analysis and Severe Accidents
1.4 Particle-Bed-Related Phenomena During SFR Severe Accident
1.4.1 Molten-pool mobility
1.4.2 Molten-pool sloshing motion
1.4.3 Debris-bed formation behavior
1.4.4 Debris-bed self-leveling behavior
1.5 Summary
References
Chapter 2 Molten-Pool Mobility
2.1
2.2 Theoretical Models and Methods for Molten-Pool Mobility
2.2.1 Multiphase flow model
2.2.2 Particle viscosity model
2.2.3 Particle jamming model
2.3 Molten-Pool Mobility in a Liquid-Dominant Particle-Rich Pool
2.3.1 Experimental conditions in a liquid-dominant particle-rich pool
2.3.2 Simulation condition for the liquid-dominant particle-rich pool experiments
2.3.3 Analyses of the liquid-dominant particle-rich pool experiments and simulations
2.4 Molten-Pool Mobility in a Particle-Dominant BubbleVisualization Pool
2.4.1 Experimental condition in a particle-dominant bubble-visualization pool
2.4.2 Simulation condition for the particle-dominant bubble-visualization pool experiments
2.4.3 Analyses of the particle-dominant bubble-visualization pool experiments and simulations
2.5 Summary
References
Chapter 3 Molten-Pool Sloshing Motion
3.1 Introduction
3.2 Sloshing Motion in a Pure Liquid Pool
3.2.1 Symmetric dam-break conditions
3.2.2 Asymmetric dam-break condition
3.2.3 Fluid-step condition
3.2.4 Centralized molten-fuel-fragment falling condition
3.2.5 Gas-injection condition with hydraulic disturbances
3.2.6 Gas-iniection condition without hydraulic disturbances
3.2.7 Gas-injection condition with stratified liquids
3.3 Sloshing Motion in a Liquid Pool with Solid Phase
3.3.1 Dam-break and fluid-step condition with ring obstacles
3.3.2 Dam-break and fluid-step condition with rod obstacles
3.3.3 Dam-break condition with solid particles
3.3.4 Gas-injection condition with solid particles
3.4 Summary
References
Chapter 4 Debris Bed Formation Behavior
4.1 Introduction
4.2 Investigations on Debris Bed Formation Behavior in Japan
4.2.1 Single-size single-shape solid particle condition
4.2.2 Mixed solid particle condition
4.3 Investigations on Debris Bed Formation Behavior in China
4.3.1 Single-size spherical solid particle condition
4.3.2 Single-size non-spherical solid particle condition
4.3.3 Mixed-size spherical solid particle condition
4.3.4 Gas-injection condition
4.3.5 Bottom-heated condition
4.4 Summary
References
Chapter 5 Debris Bed Self-Leveling Behavior
5.1 Introduction
5.2 Experimental Studies on Debris Bed Self-Leveling Behavior
5.2.1 Microscopic flow-regime experiments
5.2.2 Self-leveling experiments under depressurization and bottom-heated boiling condition
5.2.3 Self-leveling experiments under gas-injection condition
5.3 Modeling Studies on Debris Bed Self-Leveling Behavior
5.3.1 Modeling for self-leveling onset criteria
5.3.2 Modeling for the variation of inclination angle
5.3.3 Modeling for the variation of mound andbed heights
5.4 Numerical Studies on Debris Bed Self-Leveling Behavior
5.4.1 SIMMER simulation with debris-fluidization and boiling-regulation models
5.4.2 SIMMER simulation with DEM model
5.4.3 SIMMER simulation with models of inter-particle collisions and contacts
5.5 Summary
References
Chapter 6 Conclusion and Future Prospect
6.1 Conclusion for Previous Investigations
6.2 Future Prospect