Auxiliary water supply tank stored water circulation cooling system

Abstract

The present invention belongs to a pressurized water reactor nuclear power plant subsystem, and specifically relates to an auxiliary water supply tank stored water circulation cooling system, which comprises a circulation pump connected with an auxiliary water supply tank, wherein the other end of the circulation pump is connected with one end of a heat exchanger, the other end of the heat exchanger is connected with the auxiliary water supply tank, and the heat exchanger is connected with an external source. The auxiliary water supply tank stored water circulation cooling system has the following advantages that: the stored water in the auxiliary water supply tank can be cooled after the high water temperature alarm is generated during the water supply operation of the auxiliary water supply tank or during the circulation oxygen removing process, such that the condition that the water temperature is further increased to achieve the high temperature limitation value so as to cause unit recession can be prevented so as to increase safety and economy of the nuclear power plant.

Description

technical field [0001] The invention belongs to a sub-system of a pressurized water reactor nuclear power plant, in particular to a circulating cooling system for storing water in an auxiliary feedwater tank. Background technique [0002] The auxiliary water supply system is a special safety facility for PWR nuclear power plants. When an accident occurs in any normal water supply system, the auxiliary water supply system will operate to discharge the waste heat from the core until the reactor coolant system reaches the state where the waste heat removal system can be put into operation. [0003] The auxiliary water supply system is equipped with an auxiliary water supply tank. According to the existing design, the design temperature of the auxiliary water supply tank of the auxiliary water supply system is 7~50℃. When the water level of the auxiliary feed water tank is low, it will be replenished directly through the conventional island condensate pumping system or the conv...

AI Technical Summary

Problems solved by technology

[0004] If the make-up water temperature from the conventional island condensate extraction system or the conventional island desalinated water system exceeds the standard, or the water temperature of the auxiliary feed water tank is already relatively high before performing the cycle deaeration, it is very likely that the auxiliary feed water tank is performing the make-up operation or cycle deaeration. During work, the water temperature exceeded the temperature limit of 50°C, causing the unit to withdraw to shutdown, which caused hidden dangers to the safe operation of the nuclear power plant.

If the power plant site is located in an area with high summer temperatures, there is a greater risk of tank overheating

Images