Passive and active combined special safety system for nuclear power plant

Abstract

The invention belongs to safety equipment for a nuclear power plant, in particular to a passive and active combined special safety system for the nuclear power plant. The system comprises a passive high-pressure core water supply tank, an accumulator, a low-pressure safety injection pump, a refueling water tank, a secondary-side passive residual heat removal heat exchanger, a vapor condensation water tank, a containment spray system, a passive reactor cavity water injection system, related valves and related pipes. When the nuclear power plant has a design basis accident or beyond design basis accident, through a series of passive and active safety facilities used in all steps, the circuit of a reactor and the core can be cooled effectively, so that the nuclear power plant can enter a safe cold shutdown condition smoothly; and thus, the serious accident consequence of the reactor is inhibited or relieved, damage caused by accidents is relieved, and the safety of the nuclear power plant is improved.

Description

technical field [0001] The invention belongs to nuclear power plant safety equipment, and in particular relates to a specially designed safety system combining passive and active functions of the nuclear power plant. Background technique [0002] Under accident conditions, the reactor core of the pressurized water reactor nuclear power plant will continue to release a large amount of decay heat after shutdown measures are taken. In order to effectively cool the core, the current technical method is to inject a large amount of heat into the primary circuit system. Cooler borated water (safe to pour). In the early stage of the accident, when the pressure of the primary circuit system was high, the existing power plants mostly used the active method of high-pressure safety injection pump to inject water into the primary circuit. After the pressure is reduced, most power plants use low-pressure safety injection pumps to inject water into the primary circuit, while AP1000 still ...

AI Technical Summary

Problems solved by technology

Except for Westinghouse AP1000 and AP600, which have a reactor cavity water injection system designed with built-in refueling water tanks, there are currently no reports on the design of special safety facilities for preventing pressure vessel melt-through in severe accident conditions for other reactor types.

Images