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- W4200128524 abstract "A steam generator (SG) is one of the most important subsystems in a pressurized water reactor (PWR). As the interface between the reactor and the turbine for power/energy transform, its behavior dictates the response of the entire plant, especially when maneuvering the power output under dynamic operation. Generally, two types of SGs are most commonly employed in PWR designs: a recirculation-type U-tube steam generator (UTSG) and a once-through steam generator (OTSG). Among the PWR-type SMR concepts, some designs use a UTSG while several others rely on the helical coil steam generator (HCSG), which is a type of OTSG. These two designs differ in a variety of ways, namely construction, physical size for a given capability, thermodynamic characteristics, and control techniques – leading to a very different dynamic behavior under flexible operation. This paper examines the dynamic characteristics of a UTSG and a HCSG in the context of SMR flexible operation and highlights the key implications of choosing one against the other. Detailed moving boundary models are developed for both SGs. Simulation studies have been carried out in MATLAB/Simulink environment to compare their characteristics quantitatively under different loading conditions. The results have indicated that there are significant differences in dynamic behaviors between these two SGs during transient operations. Relatively larger pressure excursions in the UTSG during power maneuvers suggest more stringent considerations in equipment design and selection for safe operation." @default.
- W4200128524 created "2021-12-31" @default.
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- W4200128524 date "2022-03-01" @default.
- W4200128524 modified "2023-09-27" @default.
- W4200128524 title "Comparing the dynamic response of U-tube and helical coil steam generators in small modular reactor flexible operation" @default.
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- W4200128524 doi "https://doi.org/10.1016/j.nucengdes.2021.111610" @default.
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