The calculations were challenging because of the high level of uncertainty for data collected during the accident and the limited amount of information, resulting in a significant number of hypotheses on the accident scenario.įor unit 1, the various numerical simulations are consistent with total meltdown of the core and internal structures, which led to vessel breach. The physical and chemical phenomena which occurred in units 1 to 3 were simulated, particularly in the vessel (core damage and melt, vessel breach) and the reactor containment building (progression of melted fuel). The first phase of the BSAF project closed in 2015, and focused on the analysis of thermal-hydraulics in reactor pressure vessels (RPVs) and primary containment vessels (PCVs) for the first six days of the accident in the three damaged units (units 1 to 3). The project brought together international experts to advance the understanding of severe accident phenomena specific to the Fukushima Daiichi nuclear power plant (NPP) accident while also improving the methods and codes for modelling such severe accidents.Ī phased approach was applied in the NEA benchmark exercise. It was additionally supported by the Tokyo Electric Power Company (TEPCO), the Nuclear Damage Compensation and Decommissioning Facilitation Corporation (NDF) and other Japanese industry partners. It was hosted by the Institute of Applied Energy (IAE) in Japan, in collaboration with other Japanese institutions such as Japan Atomic Energy Agency (JAEA), Nuclear Regulatory Authority (NRA) and Central Research Institute of Electric Power Industry (CRIEPI). The objective of the project was to improve severe accident (SA) codes and to analyse the accident progression and current status of units 1 to 3 of the Fukushima Daiichi nuclear power plant (NPP), providing useful information for the decommissioning of these units. The Benchmark Study of the Accident at the Fukushima Daiichi Nuclear Power Station (BSAF) Project was established in 2012. Photo: Tokyo Electric Power Company Holdings Units 1 and 2 End of Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Company Holdings (4 th October, 2011).
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