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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Uncertainty evaluation of simulation of E-108 test facility experiments

Get access (open in a dialog) DOI: 10.1615/IHTC12.4340
6 pages

Аннотация

The need to assess the available experimental data related to RBMK-type reactors against the best estimate system codes is observed when western analysis approach is used. Originally these codes were developed and validated for BWRs and PWRs. Since state-of-art thermal hydraulic codes are widely used for simulation of RBMK reactors further codes' implementation and validation is required. The phenomena associated with channel type flow instabilities were found to be an important step in the frame of the overall effort of state-of-the-art validation and application for RBMK reactors. In the paper an evaluation of experimental data obtained at Russian Elektrogorsk E-108 test facility is presented. E-108 facility is a scaled model of Russian RBMK design reactor. The facility consists of six full-height parallel heated tubes, each of which simulates a single RBMK fuel channel. One of the features studied with E-108 was that of identifying the system conditions at which flow instabilities between the parallel channels developed as a function of the variations in the thermal hydraulic conditions.
The need to identify "best estimate" assumptions and effects related to particularly analysed objects, identification of weaknesses in conservative methods enables uncertainty methodologies accept more widely in the analysis. Thus, in addition, an uncertainty analysis of one of the experiments was performed by employing German System for Uncertainty and Sensitivity Analysis (Glaeser, 2000). Simulation results of two thermal hydraulic codes are compared in order to identify the parameters, which contribute most to the uncertainty of the results. It was one of the first attempts to use this statistic-based methodology in Lithuania. The obtained knowledge further will be used in the licensing process of Ignalina NPP.