Natural circulation heat exchanger for discharging waste heat of supercritical water reactor

Abstract

The invention belongs to the technical field of nuclear power plant safety and especially relates to a natural circulation heat exchanger for discharging waste heat of a supercritical water reactor. Supercritical water flows in a heat fluid supercritical water annular channel, so as to form a first collateral circulation; the heat fluid supercritical water annular channel is a narrow annular pipe; and cold fluid water flows in a cold fluid water descending channel, a lower chamber, a cold fluid water ascending channel and a top chamber, so as to for a secondary collateral circulation. Under the condition of normal tripping or accident emergency tripping of the supercritical water reactor, a supercritical narrow slit natural circulation heat exchanger is used for discharging the waste heat; without any external force, the system failure probability caused by a dynamic part fault and a manual operation error is effectively reduced; and the running safety of the reactor is increased.

Description

technical field [0001] The invention belongs to the technical field of safety of nuclear power plants, and in particular relates to a natural circulation heat exchanger used for exhausting waste heat of a supercritical water reactor. Background technique [0002] The SCWR is the only water-cooled reactor among the six Generation IV future reactor types. It adopts a once-through cycle design, and supercritical water is selected as the core coolant without phase change. Reactor core outlet parameters: 25MPa, 500°C, thermal efficiency can reach 45%. The thermal power of a single unit can reach more than 1700MW. [0003] For a supercritical water reactor with a once-through circulation design, the core coolant circuit is directly connected to the steam turbine, feed water heater and other conventional circulation circuits, and there will be more potential risks in operation, and safety must be adhered to and ensured the rules. One of the main issues to ensure the safety of s...

AI Technical Summary

Problems solved by technology

At this time, if the original primary circulation loop is used to export the core heat, the radioactive material will diffuse to the outside of the nuclear reactor containment, endangering the safety of the surrounding environment.

In addition, the supercritical water reactor coolant flow rate is large, and the temperature rise of the inlet and outlet is large

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