Обгрунтування вибору схемного рішення і геометричних параметрів СПВТ ГО ВВЕР-1000

• Main Authors: Naffaa, Kh. M., Dubkovsky, V.
• Format: Article
• Language: Ukrainian
• Published: State Scientific and Technical Center for Nuclear and Radiation Safety 2014
• Online Access: https://nuclear-journal.com/index.php/journal/article/view/401

The closed-type evaporation-condensation device based on a low-temperature two-phase annular thermosyphon is one of the most efficient containment cooling systems for new generation of WWER-1000 reactors. This system provides efficient heat transfer from the containment to the ultimate heat sink through transfer of the latent heat caused by steam generation. The evaporator is located inside the containment and the condenser is placed beyond it. The evaporator and condenser are interconnected by steam and condensate piping. The paper is aimed at justification of circuit design and geometric parameters (filling ratio, inclination angle, geometry of system components) of the passive heat removal system for WWER-1000 containment (C-PHRS) based on a two-phase thermosyphon. The C-PHRS circuit was modeled by means of the RELA5/MOD3.4 thermohydraulic code. Three types of thermosyphons were reviewed and analyzed: ordinary two-phased, L-shaped pipe, and two-phase closed thermosyphons. The filling ratio ranged from 0.1 to 0.8 and the inclination angle ranged from 5 to 90 deg. Calculations were performed for both tubular and plate heat-exchange surfaces.