Essential service water system at nuclear power plant

Abstract

The invention relates to the nuclear power technology, and aims at the defects that the once-through cooling mode of an essential service water system (SEC) is inappropriate when the water temperature of a water source is larger than the preset threshold to provide an essential service water system at a nuclear power plant which comprises a water intake and a pump water inlet room, wherein the pump water inlet room comprises a first water inlet connected to the water intake, and a second water inlet connected to the water intake, and also comprises a fourth isolation valve arranged between the first water inlet and the water intake, a second isolation valve arranged between the second water inlet and the water intake, a bypass cooling system, and a water temperature measuring device; and when the water temperature of the water intake determined by the water temperature measuring device is higher than the preset threshold, the second isolation valve is opened and the fourth isolation valve is closed, and when the water temperature is lower than the preset threshold, the second isolation valve is closed and the fourth isolation valve is opened. With the bypass cooling system, the bypass cooling system can be adopted to cool when the water temperature is larger than the preset threshold, thereby solving the technical problems that the existing once-through cooling mode is inappropriate when the water temperature of a water source is larger than the preset threshold.

Description

technical field [0001] The invention relates to nuclear power technology, and more specifically relates to an important plant water system of a nuclear power plant. Background technique [0002] The function of the important factory water system (SEC, Essential Service Water) is to transfer the heat load collected by the equipment cooling water system (RRI, Component Cooling) to the final heat sink—water body or atmosphere. The water body of the final heat sink can be oceans, rivers, lakes or reservoirs. When the capacity of the water body is large enough, the important plant water system can adopt a once-through cooling method, that is, the SEC pump directly transports the source water to the RRI / SEC plate heat exchanger for cooling The equipment is used as cooling water, which is then discharged directly back into the body of water. The condition of the once-through cooling method is that the water temperature of the water source in the site area is ≤32°C. Therefore, whe...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an important plant water system for nuclear power plants in view of the defect that the existing once-through cooling method cannot be applied when the water temperature of the water source is greater than the preset threshold value.

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