Please use this identifier to cite or link to this item: http://113.161.190.196:8080/thuvienso/handle/123456789/2104
Title: Tiểu ban A: UNCERTAINTY QUANTIFICATION OF RELAP5/MOD3.3 FOR INTERFACIAL SHEAR STRESS DURING SMALL BREAK LOCA
Authors: Duong Thanh Tung
Keywords: BEPU, Statistical Method, Interfacial Shear Stress, Small Break LOCA
Issue Date: 2017
Publisher: Viện Năng lượng nguyên tử Việt Nam
Abstract: The Best-Estimate Plus Uncertainty (BEPU) is applied as Deterministic Approach for safety analysis of Nuclear Power Plant using the system analysis code. The system analysis code such as Relap5/Mod3.3 is required to be able to simulate the thermal-hydraulic behavior of nuclear reactor in some accident scenarios. Relap5/Mod3.3 is developed based on two-fluid models and 6 conservation equations for each phase which challenge for mathematical modeling such as one-demensional equation, time-dependent equation, multidimensional effects or complicated geometry. Thus, it is necessary to verify the applicability of a system analysis code that is abble to predict accurately the two-phase flow such as interfacial shear between two phases; liquid and gases. It is also important to know the prediction uncertainty due to the constitutive relation in order to close the two-fluid model equation. In PWR’s Small-Break LOCA (SB-LOCA) accident, the loop-seal clearing is important phenomena where we would like to know how much water (reflux condensation) will be going into the reactor core from Steam Generator.Therefore, the experimental data is used to compare with simulation results. In this work, the UPTF-TRAM simulated the counter-current flow in Loop-seal Clearing between vapor and liquid in Loop-seal during SB-LOCA is used to verify the applicability of Relap5/Mod3.3. Moreover, the prediction uncertainty is also investigated by applying the statistical method or BEPU in which the SUSA program developed by GRS is used.
URI: http://113.161.190.196:8080/thuvienso/handle/123456789/2104
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