Effect of Channel Thermal Hydraulic Conditions on Bundle Motion Due to Reverse Flow

Abstract

If a break should occur in the inlet feeder or inlet header of a CANDU reactor, the rapid depressurization will cause the channel flow(s) to reverse. Depending on the gap between the upstream bundle and shield plug, the string of bundles will accelerate in the reverse direction and impact with the upstream shield plug. The effects of the channel thermal hydraulic conditions on the bundle movement due to reverse flow are investigated. These conditions include channel power as well as enthalpy and pressure of inlet and outlet headers.