scholarly journals The Development of a Thermal-Hydraulic and Nonlinear Dynamic System for Molten Salt Reactors

2021 ◽  
Vol 11 (2) ◽  
pp. 7023-7028
Author(s):  
A. Ali ◽  
Y. K. Liu ◽  
W. Raza ◽  
M. Nazim ◽  
A. Ali ◽  
...  
Keyword(s):  
Molten Salt ◽  
Nuclear Reactor ◽  
Natural Circulation ◽  
Kinetic Equations ◽  
Nonlinear Dynamic System ◽  
Core System ◽  
Fuel Salt ◽  
Future Direction ◽  
Nonlinear Kinetic Equations ◽  
Nonlinear Kinetic

The Molten Salt Reactor (MSR) is the most important system suggested by Generation IV for the future direction in the nuclear reactor field. For more development of the MSR reactor, the core system inside the tube is proposed by naturally circulating molten fuel salt. The nonlinear kinetic equations form a linearized function and are obtained in state-space form. Reactivity feedback and delayed neutrons are extremely important for reactor control. In this paper, a thermal-hydraulic system for the commercial computation dynamic model is proposed. Currently, there is no commercial software to simulate the natural circulation flow. The proposed method can be easily employed to detect faults and can provide a feasible overall system performance.

Preliminary Study of the Use of Freeze-Valves for a Passive Shutdown System in Molten Salt Reactors

2014 ◽  
Author(s):  
Qiming Li ◽  
Zhongfeng Tang ◽  
Yuan Fu ◽  
Zhong Li ◽  
Naxiu Wang
Keyword(s):  
Molten Salt ◽  
Nuclear Reactor ◽  
Reactor Core ◽  
Mechanical Valve ◽  
Thermal Design ◽  
Normal Operation ◽  
Passive System ◽  
Fuel Salt ◽  
Preliminary Study ◽  
Accident Conditions

The use of passive shutdown systems to enhance safety is one element of next-generation reactor design. The Freeze-Valve has been proposed as a key device in the passive system to stop the chain reaction of the Molten Salt Reactor (MSR), which has been chosen by Generation IV International Forum (GIF) as one of the six Generation IV reactor concepts. During reactor normal operation, the molten salt in the valve is cooled to a solid plug. In the event that the reactor overheats under accident conditions when all other active control systems fail, the plug will melt. The liquid fuel salt will be pulled out from the reactor core by gravity into dump tanks, and criticality will cease because the reaction is no longer moderated by the graphite in the reactor core. The more accurate the Freeze-Valve’s thermal design is, the more efficient the passive shutdown system becomes. In this study, an investigation of the thermal performance of the Freeze-Valve is conducted based on finite element methods verified by experimental data, and some modified designs are presented with recommendations. For further consideration, some innovative governing techniques used to control the Freeze-Valve are discussed in detail. Here, a more critical thermal design is focused on that can make the passive system shut down the nuclear reactor quickly and reliably. The Freeze-Valve can be used in the molten salt loop rather than a mechanical valve, which may become jammed by frozen salt. Paper published with permission.

Initial state dependence of nonlinear kinetic equations: The classical electron gas

1985 ◽  
Vol 41 (1-2) ◽  
pp. 75-93 ◽  
Author(s):  
M. C. Marchetti ◽  
E. G. D. Cohen ◽  
J. R. Dorfman ◽  
T. R. Kirkpatrick
Keyword(s):  
Electron Gas ◽  
Kinetic Equations ◽  
State Dependence ◽  
Initial State ◽  
Classical Electron ◽  
Classical Electron Gas ◽  
Nonlinear Kinetic Equations ◽  
Nonlinear Kinetic
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