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 towards reliable application of high-quality best-estimate and uncertainty and sensitivity evaluation methods. The application of these methods to a large-break loss of coolant accident (LB-LOCA) constitutes the main activity of the programme, structured into two main stages:
A presentation of the uncertainty methodologies to be used by the participants (Phase I) is included in the first step. The final phase (Phase VI) consists of the synthesis conclusions and recommendations. The scope of Phase V of the BEMUSE programme is the uncertainty analysis of a LB-LOCA based on a Phase IV reference calculation. The LB-LOCA scenario takes place in ZION plant which is a generic four-loop PWR reactor.