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Thermal-hydraulic models for liquid metal cooling circuits of GenIV reactors

pubblicazioni - Memoria

Thermal-hydraulic models for liquid metal cooling circuits of GenIV reactors

In the field of real time power plant dynamic simulation, ERSE developed an integrated software environment, named “Lego Plant Simulation Tools” (LegoPST), capable to model a whole plant in real time, from the field (plant process and machinery) to the human-machine interface.

LegoPST was successfully used to build dynamic plant simulators both for nuclear LWRs and conventional installations and permits to verify the plant control and automation system and perform operation transient analysis and operators training. The models library consists in an expandable set of mathematical models of the plant components and physical properties of various fluids. All the mathematical models are based on the mass, momentum and energy conservation equations, developed with a lumped-parameter approach. The related equation system is closed by coupling material property correlations and fluid state equations. In the framework of its application to liquid metal cooling circuits, that are presently under study for the nuclear reactors of Generation IV, models of specific plant components (drums, pipes, pumps, valves, etc.) for simulating liquid metal loops were developed, and LegoPST libraries of the fluid physical properties were extended to liquid lead and lead-bismuth eutectic alloy. An example of application is reported, showing the approach adopted for the simulation of a closed loop experimental facility dedicated to study the natural circulation of liquid lead-bismuth, where the correct reproduction of circuit friction and form pressure losses is a key-aspect. The modelization of a steam generator designed for a liquid lead cooled large-power reactor is presented, together with the code response to a typical plant transient.

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