The comparison of designed water-cooled and air-cooled passive residual heat removal system for 300Â MW nuclear power plant during the feed-water line break scenario

► The PRHRSs are designed for 300 MW PWR. ► Two cooling patterns (water-cooled and air-cooled) are adopted in the PRHRSs. ► The characteristics comparison of two type PRHRSs are performed during FLB accident. ► The characteristics comparison of two type PRHRSs are performed during FLB accident. ► The ACPRHRS is more effective for long term cooling.