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- W1541909968 abstract "The development of effective theoretical models and (based on it) digital codes which have the potential to describe in a detailed way the overall transient and accidental behaviour of both the reactor core but also the main components of different NPP types has already very early been an important task in the field of reactor safety research. Within this context an own special thermal-hydraulic model for one of these components, namely the natural circulation U-tube steam generator together with its main steam and feedwater systems, has been derived. The resulting digital code UTSG (Hoeld, 1978) could be used both in a stand-alone manner but also as a part of more comprehensive transient codes. As such an overall code the thermal-hydraulic GRS system code ATHLET (Burwell et al., 1989, Hoeld 1990b, later-on also Austregesilo et al., 2003 and Lerchl et al., 2009) has been chosen. Along with the ATHLET code a special high level simulation language has been derived too (Austregesilo & Voggenberger, 1990; Austregesilo & Hoeld, 1991), resulting in the basic module GCSM (General Control Simulation Module) provided for the flexible description of balance-of-plant (BOP) actions as caused, for example, by the control, limitation and protection systems of NPP-s, thereby connecting basic functional blocks (e.g., switches, function generators, adders, differentiators, integrators) in an appropriate way. Due to the rising demands coming from safety-related research studies and based on the efforts of many years work of application both at the GRS but also at a number of other institutes of different countries the UTSG theory and code had to be and had been continuously extended, yielding in a first step as a very satisfactory version the code UTSG2 (Hoeld 1990a). From the experience gained during the continuous development of this code it arose after a while the question how to establish an own basic element which is able to simulate the thermal-hydraulic situation in a cooled or heated coolant channel in an as general as possible way so that it can be applied for any modular construction of complex thermalhydraulic assemblies of pipes and junctions. As a result finally a theoretical model has been derived based on a theoretical drift-flux related three-equation mixture fluid approach. The" @default.
- W1541909968 created "2016-06-24" @default.
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- W1541909968 date "2011-03-16" @default.
- W1541909968 modified "2023-10-03" @default.
- W1541909968 title "The Thermal-hydraulic U-tube Steam Generator Model and Code UTSG-3 (Based on the Universally Applicable Coolant Channel Module CCM)" @default.
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- W1541909968 doi "https://doi.org/10.5772/15226" @default.
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