Passive heat removal system built into the containment

摘要

The invention relates generally to the nuclear energy field, and more particularly to pressurized water reactor containment internal passive heat removal systems (C PHRS), and is designed for reactor containment cooling by natural circulation of the cooling liquid (water) in the system circuit. The technical result of the invention is increase of heat removal efficiency, flow stability in the circuit and, consequently, system operation reliability. The system has at least one cooling water circulation circuit comprising a heat exchanger located inside the containment and including an upper header and a lower header interconnected by heat-exchange tubes, a riser pipeline and a downtake pipeline connected to the heat exchanger, a cooling water supply tank located above the heat exchanger outside the containment and connected to the downtake pipeline, a steam relief valve connected to the riser pipeline and located in the water supply tank and hydraulically connected to the latter. The upper header and the lower header of the heat exchanger are divided into heat-exchange tube sections on the assumption that: L/D ‰¤ 20, where L is the header section length, D is the header bore.