BEMUSE Phase V Report: Uncertainty and Sensitivity Analysis of a LB-LOCA in ZION Nuclear Power Plant

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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 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:

  • Step 1: Best-estimate and uncertainty and sensitivity evaluations of the LOFT L2-5 test (Phases II and III). LOFT is the only integral test facility with a nuclear core where thermal-hydraulic safety experiments have been performed.
  • Step 2: Best-estimate and uncertainty and sensitivity evaluations of a nuclear power plant (Phases IV and V).

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.