BEMUSE Phase II Report: Re-Analysis of the ISP-13 Exercise, Post Test Analysis of the LOFT L2-5 Test Calculation

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The Best-estimate Methods – Uncertainty and Sensitivity Evaluation (BEMUSE) Programme, promoted by the Working Group on Accident Management and Analysis (WGAMA) and endorsed by the Committee on the Safety of Nuclear Installations (CSNI), represents an important step on the road to the reliable application of high-quality best-estimate and uncertainty evaluation methods. The activity consists of six phases.

The scope of Phase II of BEMUSE is to perform large-break loss-of-coolant accident (LBLOCA) analysis making reference to the experimental data of LOFT L2-5 in order to address the issue of “the capabilities of computational tools” including the scaling/uncertainty analysis. The operational objective of the activity is the quality demonstration of the system code calculations in performing LBLOCA analysis through the fulfilment of a comprehensive set of common criteria established in correspondence of different steps of the code assessment process.

14 participants from 13 organisations and 11 countries participated in Phase II of BEMUSE Programme, submitting the required calculations and using seven thermalhydraulic system codes. End users for the results are expected to be industry, safety authorities and research laboratories.