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THE EFFECT OF SUBCOOLED BOILING ON THE DYNAMIC INSTABILITY OF A NATURAL CIRCULATION SYSTEM

T Nergy

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Abstract

The appearance of subcooled boiling is the beginning of the thermodynamic non-equilibrium that may lead a fluid flow system into low-quality instability region. The effect of subcooled boiling on the stability and transient behavior of a natural circulation system adopted in 5 MW and 200 MW Low Temperature Heating Reactors has been studied. The impact of void departure point Zd?distribution parameter C0 and drift velocity coefficient Ci on void distribution and stability of the system is also investigated. The results showed: (1) Under large perturbation such as accident conditions the void reactivity feedback caused by subcooled boiling is considerable, and, bigger difference exists between various subcooled boiling models. (2) Under small perturbation such as parameter fluctuation the impact of sub-cooled boiling on the stability of system can be neglected, and results from various models are agreeable to each other.

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What this paper is about

The appearance of subcooled boiling is the beginning of the thermodynamic non-equilibrium that may lead a fluid flow system into low-quality instability region. The effect of subcooled boiling on the stability and transient behavior of a natural circulation system adopted in 5 MW and 200 MW Low Temperature Heating Reactors has been studied. The impact of void departure point Zd?distribution parameter C0 and drift velocity coefficient Ci on void distribution and stability of the system is also investigated. The results showed: (1) Under large perturbation such as accident conditions the void reactivity feedback caused by subcooled boiling is considerable, and, bigger difference exists between various subcooled boiling models. (2) Under small perturbation such as parameter fluctuation the impact of sub-cooled boiling on the stability of system can be neglected, and results from various models are agreeable to each other.

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Available abstract

The appearance of subcooled boiling is the beginning of the thermodynamic non-equilibrium that may lead a fluid flow system into low-quality instability region. The effect of subcooled boiling on the stability and transient behavior of a natural circulation system adopted in 5 MW and 200 MW Low Temperature Heating Reactors has been studied. The impact of void departure point Zd?distribution parameter C0 and drift velocity coefficient Ci on void distribution and stability of the system is also investigated. The results showed: (1) Under large perturbation such as accident conditions the void reactivity feedback caused by subcooled boiling is considerable, and, bigger difference exists between various subcooled boiling models. (2) Under small perturbation such as parameter fluctuation the impact of sub-cooled boiling on the stability of system can be neglected, and results from various models are agreeable to each other.

Key concepts: Subcooling, Natural circulation, Boiling, Thermodynamics, Boiling point, Void (composites), Mechanics, Instability

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