Marviken Critical Flow Test Program

A multinational project, the Marviken Full Scale Critical Flow Tests conducted twenty-seven tests to obtain critical mass flow data for short nozzle geometries (200 to 509 mm diameters with length to diameter ratios from 0.3 to 3.7) comparable to pipe sizes present in world nuclear reactor stations. Typical data are presented and discussed. The nozzle inlet pressures ranged from 5.2 to 2.6 MPa with the fluid subcooled as much as 500C to low quality saturation. A maximum nozzle mass flow rate of 14 Mg/s was measured. The data provide an important link between the previously available small scale critical mass flow rate data and existing operational hardware