Combined Active and Passive Marine Reactor Emergency Waste Heat Removal System

Abstract

The invention relates to an active and passive combined ship reactor emergence waste heat discharging system. The active and passive combined ship reactor emergence waste heat discharging system comprises a DC (direct current) steam generator, a first waste heat discharging system, a second waste heat discharging system as well as an input pipe and an output pipe. The DC steam generator is arranged in a safety housing, and the first waste heat discharging system and the second waste heat discharging system are arranged outside the safety housing. When the first waste heat discharging system works, a gaseous coolant flowing out from a first outlet enters a first condensation apparatus to be condensed and then enters a condensation collection box to be collected by virtue of a second outlet,and a water pumping apparatus delivers the coolant in the condensation collection into the DC steam generator via a first inlet; and when the second waste heat discharging system works, the gaseous coolant flowing out via the first outlet enters a second condensation apparatus to be condensed and is then delivered into the DC steam generator via the first inlet. By integrating the advantages of two heat discharging ways, the active and passive combined ship reactor emergence waste heat discharging system is wide in range of suitable accidents, high in heat discharging efficiency and capable of improving the system reliability and safety of power plants at the same time.

Description

technical field [0001] The invention relates to a dedicated safety system for a marine reactor, more specifically, an active and passive emergency waste heat discharge system for a marine reactor. Background technique [0002] The main purpose of the marine reactor safety system is to ensure the emergency shutdown of the reactor, the discharge of residual heat from the core and the integrity of the containment vessel after the accident, so as to limit the development of the accident and reduce the consequences of the accident. Among them, the issue of reactor waste heat removal is particularly important under accident conditions. It is directly related to the safety of the reactor. If it is not handled properly, it will cause the primary circuit coolant to boil or even melt the core. Therefore, the design of the emergency waste heat removal system of the reactor has always been the key to the design of the reactor. One of the techniques. [0003] Compared with land reactors...

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Problems solved by technology

[0008] 1. The hull space of the marine reactor is limited, and it is impossible to install an oversized water tank. If a dynamic auxiliary water supply system is used to discharge waste heat, a larger auxiliary water supply tank needs to be installed;

[0009] 2. Sea fresh water resources are limited, and water treatment is more difficult than on land. If an active auxiliary water supply system is used to discharge waste heat, a large amount of steam generated by the steam generator needs to be discharged to the atmosphere to form an open cycle, which causes waste of fresh water on board

[0010] Due to its own characteristics, the marine reactor tends to choose a small volume and high efficiency once-through steam generator. Since the secondary side capacity of the once-through steam generator is small (compared with the U-shaped steam generator), if a dynamic auxiliary water supply system is used to discharge Waste heat requires a large amount of steam generated by the steam generator to be discharged to the atmosphere, which may easily cause "flash" on the secondary side of the once-through steam generator, which may deteriorate heat transfer and cause more serious accidents

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