1,720,985 research outputs found
Scaling of accuracy of Relap5 Code (initial results)
No full textThe idea of accuracy extrapolation was launched in this paper. The concerned area is nuclear thermal-hydraulic and the issue is the capability to predict large Nuclear Power Plant (NPP) transient performance when only small scale experiments are available. It is clear that experimental data measured in differently scaled facility (whatever is their size and operating conditions) cannot be extrapolated to NPP conditions due to a number of well recognized scaling distortions (like heat losses, thermal energy release from passive structures, etc.). Furthermore one may not scale-up results from code calculations because of numerical issues (results affected by node size and relative position of nodes). However one may scale up the error or the accuracy of results, i.e. the combination, for instance the ratio, of measured and calculated values. The accuracy may become available from facilities (and related calculations) of different size and scale and may be extrapolate to the NPP (prototype) condition
Qualification of the Fast Fourier Transform based methodology for the quantification of thermal-hydraulic system codes accuracy
No full textThe idea and the applicability of the Fast Fourier Transform Based Method (FFTBM) to the quantification of accuracy of predictions of system thermal-hydraulic codes, was already established, as well as the main features and the software for adopting the procedure. Thresholds of acceptability of results, namely quality of code calculation results compared with experimental data, were also proposed.
The present document aims at further qualifying the method which is going to be used by several International Institutions
HARIA-2:un sistema per la pianificazione e l'analisi di emergenze tecnologiche - Validazione del modulo Creazione Scenari Statici
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Experiments of Core Coolability by a Gravity Driven System performed in PIPER-ONE Apparatus
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Evaluation of a Thermalhydraulic Instability Experiment performed in Piper-One Apparatus
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Application of RELAP5/MOD2 and RELAP5/MOD3 codes to Isolation Condenser related experiments
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