A method for adjusting the outlet temperature of cold water in the cold chain system of a nuclear power plant

Abstract

The invention discloses a nuclear power plant cold chain system and a cold water effluent temperature regulation method thereof. According to the cold chain system, a water inlet bypass and a water outlet bypass are increased on a traditional plant water system; the two bypasses go around a heat exchanger and are connected between a water inlet pipe and a water outlet pipe; and access points of the water inlet bypass on the water inlet pipe and the water outlet pipe are respectively positioned at the upstream parts of access points of the water outlet bypass on the water inlet pipe and the water outlet pipe. According to the cold water effluent temperature regulation method, the water inlet bypass and the water outlet bypass are utilized at a low temperature, and a heat exchange mode of the plant water system is switched from counter-flow heat exchange to down-flow heat exchange, so that the cold water effluent temperature is improved. Compared with the prior art, the nuclear power plant cold chain system disclosed by the invention has the advantages that two simple bypasses are increased in the traditional plant water system, so that the plant water system can be switched from the counter-flow heat exchange mode to the down-flow heat change mode at a low temperature, and the freezing risk of the cold water is effectively avoided.

Description

technical field [0001] The invention belongs to the field of heat discharge of nuclear power plants. More specifically, the invention relates to a cold chain system of a nuclear power plant and a method for adjusting the outlet temperature of cold water. Background technique [0002] The cold chain system of a nuclear power plant is composed of an equipment cooling water system (i.e. CCS or RRI) and a plant water system (i.e. SWS or SEC). Then use the heat exchanger to exchange heat with the cooling water of the plant water system, and then transfer the heat to the environment through the plant water system, so as to ensure that the equipment and systems in the nuclear island are within the appropriate working parameter range. Since the heat delivered includes the decay heat of the shutdown core, the waste heat of the spent fuel pool, and the heat of the main safety equipment such as the main pump, only by safely and reliably discharging these heat can the unexpected shutdow...

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Problems solved by technology

However, the control process of adjusting the flow rate of the heat exchanger on both sides is relatively complicated, and due to the large number of users of the cold chain system, controlling the flow rate of the cooling water will have a greater impact on the users, so that there will be a certain degree of freezing of the cooling water when the cooling water temperature is low. risk

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