Review of the Effect of Hydraulic Load and Stress on the Feedwater Box Depending on the Location of Break during APR1400 Steam Generator Feedwater Line Break Accident

The APR1400 steam generator requires a design to secure the integrity of the internal structure during a feedwater line break accident, which is a design-based accident, and an evaluation is conducted to confirm this. When the feedwater line break occurs, the fluid inside the steam generator is momentarily released and the pressure drops rapidly, resulting in a hydraulic load on the internal structure. The accident analysis code is used to calculate the hydraulic load, and the break accident requires the end of the feedwater line nozzle as the location of the accident. This study analyzes the effect of the hydraulic load and stress on the feedwater box depending on the location of the feedwater line break accident.