Small-flow reflowing and flow limiting control device

A current-limiting control and current-limiting device technology, applied in the direction of controlling water supply, cooling devices, gas/liquid distribution and storage, etc., can solve problems affecting the normal operation of the system, failure of pneumatic valves/electric valves, and affecting the safe operation of nuclear power plants. To achieve the effect of simplifying small flow backflow and current limiting control devices, improving reliability and safety, and improving reliability

Active Publication Date: 2015-04-29
SHANDONG NUCLEAR POWER CO LTD
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AI Technical Summary

Problems solved by technology

[0007] During the operation of the nuclear power plant pressurized water reactor, once the gas source / power supply is lost, the pneumatic valve / electric valve will fail, affecting the normal operation of the start-stop (auxiliary) water supply system, thereby affecting the safe operation of the nuclear power plant

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Embodiment Construction

[0029] In order to understand the present invention more clearly, the small flow backflow and current limiting control device of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] Such as figure 2 As shown, the start-stop (auxiliary) water supply system of the nuclear power plant is set outside the containment of the reactor, including the water storage tank 3, the pump inlet isolation valve 4, the feed water pump 5, and the small flow backflow and flow limiting control device 2, which are set inside the containment In-containment check valve 6 , in-containment isolation valve 7 , and steam generator 8 .

[0031] The small flow backflow and current limiting control device 2 of this embodiment includes a flow meter 21 connected to the main channel of the nuclear power plant start-stop water supply system and / or auxiliary water supply system, an automatic recirculation valve 22, a flow regulating valve 27, a flow limiti...

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Abstract

The invention provides a small-flow reflowing and flow limiting control device which is used for a start-stop water supply system and / or an auxiliary water supply system of a nuclear power station and comprises a flow meter, an automatic recirculating valve, a flow limiting device and a first isolating valve which are connected to a main flow passage of the start-stop water supply system and / or the auxiliary water supply system of the nuclear power station. A bypass valve of the automatic recirculating valve, a check valve and a second isolating valve are sequentially connected by pipelines to form a small-flow reflowing passage of the start-stop water supply system and / or the auxiliary water supply system of the nuclear power station. The small-flow reflowing and flow limiting control device provided by the invention adopts passive components of the automatic recirculating valve and a pressure reducing valve to achieve a small-flow reflowing function and adopts a passive component of a flow limiting orifice plate to achieve the flow limiting function, and thus, the reliability and safety of the small-flow reflowing and flow limiting control device are improved, so that the safety operation of the nuclear power station is ensured.

Description

technical field [0001] The invention relates to a nuclear power plant start-stop water supply system and an auxiliary water supply system, in particular to a small-flow backflow and current limiting control device for the nuclear power plant start-stop (auxiliary) water supply system. Background technique [0002] The start-stop water supply system of the nuclear power plant pressurized water reactor fills the steam generator with water when the unit is started, hot standby and shut down to take away the core heat. The auxiliary water supply system of the pressurized water reactor of the nuclear power plant is used when the main water supply fails. In the case of accident shutdown of the power station, the auxiliary water supply system is used to maintain the thermal shutdown of the power station for a sufficient time, and to cool the reactor until the waste heat discharge system can put into operation state. The auxiliary water supply system is a special safety device. In ...

Claims

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Application Information

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IPC IPC(8): G21C15/18F22D5/00F17D1/08
CPCF22D5/00G21C15/18Y02E30/30
Inventor 武心壮夏栓徐进邱健陈丽黄秀杰
Owner SHANDONG NUCLEAR POWER CO LTD
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