Electrical cable-tray fires pose a known safety risk at nuclear power plants. As part of the OECD funded PRISME-3 experimental programme, IRSN aims to improve understanding of cable-tray fires in confined and ventilated environm. Electrical cable-tray fires pose a known safety risk at nuclear power plants. As part of the OECD funded PRISME-3 experimental programme, IRSN aims to improve understanding of cable-tray fires in confined and ventilated environments. In this study, a PVC cable fire in horizontally stacked long cable-trays is simulated using the CALIF3S-Isis CFD cod. Since the 1980s, almost half of the 550 fire events recorded on Nuclear Power Plants (NPPs) have been caused by electrical equipment failure. Such electrical failures can lead to ignition of the plastic materials which make up electrical cables. As several hundred kilometres of electrical cables can be found in NPPs, they pose a significant fire hazard, with one example of a serious cable fire occurring at the Browns Ferry NPP in 1975. Electrical cables are often grouped together and installed in trays, hereon fires associated with such a configuration are referred to simply as cable-tray fires.In cable-trays, fire spreads both horizontally through the tray, and vertically through the stack, consuming the combustible material until flammability conditions are removed. The CFP corridor experimental campaign involved a series of fire experiments under contained and ventilated conditions. In each test, the fire source involved three horizontal ladder-type cable trays with widths of 0.45 m, stacked one upon the other with a vertical spacing, h, of 0.3 m. The 6 m long trays were ignited from one end, with the fire th. In this section, we provide an overview of the implemented FLASH-CAT approach specific to CALIF3S-Isis. The aim is to provide an accurate as possible estimation of the HRR evolution for a cable-tray fire scenario, using time-averaged quantities and material parameters. The model assumes that fire spreads both horizontally and vertically. In this st. In this section, we present the governing equations and numerical set-up, including the mesh and the boundary and initial conditions for the simulations.
