Abstract
A numerical investigation of the ECC (Emergency Core Cooling) coolant transportation in the reactor annular down-comer is performed in this paper. The density difference of coolant is paid special concern and is quantificationally analyzed. If the ECC coolant with low density and high velocity is injected into the annular down-comer, the horizontal kinetic energy decays as the azimuthal angle of down-comer increases. As a result, the ECC coolant transports through the annular down-comer along the clockwise direction. If the ECC coolant with high density and low velocity is injected, the coolant falls vertically and arrives the lower plenum as it enters the annular down-comer. As the lower plenum is filled with the ECC coolant, part of the ECC coolant moves upward due to the mass force effect. With the density difference, remarkable velocity oscillation is generated in the lower space of the down-comer. The transportation of ECC coolant insider the down-comer is decided by Froud number. When the Froud number is larger than 1.2, the inertia force dominant mixing is formed and the ECC coolant transports in the clockwise direction. When the Froud number is lower than 0.8, the buoyancy driven mixing is formed and the ECC coolant transports in the anti-clockwise direction.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
