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Publication . Conference object . Other literature type . Presentation . Article . 2021

UNCERTAINTY AND SENSITIVITY ANALYSIS OF THE PHEBUS FPT1 TEST SIMULATION RESULTS

Noura Elsalamouny; Tadas Kaliatka;
Open Access
Abstract
The PHEBUS program is an example of an international cooperative research program providing valuable data for validating severe accident analysis computer codes. One of the main objectives of the PHEBUS program is to study the process in the bundle of the light water reactors during severe accident conditions as well as the release, transport, and retention of fission products. In this article the PHEBUS - FPT1 test will be analyzed in more detail, focusing on the late phase of bundle degradation. Best estimate simulations are provided using best estimate, severe accident code - RELAP/SCDAPSIM. However, the simulation of processes in the nuclear installation during accidents is attended with many uncertainties. There are three major sources of uncertainties: code or model uncertainty, representation or simulation uncertainty, and plant (installation) uncertainty. This article is focusing on the uncertainties which come from the initial parameters and boundary conditions. For the uncertainty and sensitivity analysis of the RELAP/SCDAPSIM calculation results, the GRS methodology is used together with SUSA statistical tool. The results of uncertainty analysis show the accuracy of the calculation results. The upper and lower limits of the calculation results (cladding temperature and total hydrogen generation) is bounding experimental data. The results of the sensitivity analysis give a perception of the influence of the uncertain initial parameters on the calculation results. Sensitivity analysis indicated thermal conductivity of ZrO2 as the dominant initial parameter for the calculation results. Using experience gained form the application of Uncertainty and Sensitivity analysis will be possible to update the model in order to get more accurate simulation results of the PHEBUS - FPT1 test.
Subjects

Severe accidents, Uncertainty and Sensitivity, PHEBUS - FPT1

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