Main water supply device for steam generator of pressurized water reactor nuclear power plant

Abstract

The invention discloses a main water supply device for a steam generator of a pressurized water reactor nuclear power plant. The main water supply device comprises a water supply connecting pipe assembly which is arranged on a pressure-bearing shell of the steam generator of the pressurized water reactor nuclear power plant and used for connecting an external water source and a water supply annular pipe assembly disposed in the steam generator for injecting water into the steam generator; the water supply annular pipe assembly and the water supply connecting pipe assembly are connected by a connection assembly in a sealing mode; the water supply connecting pipe assembly and the water supply annular pipe assembly are located at different levels, the water supply annular pipe assembly is located above the water supply connecting pipe assembly for reducing the thermal stratification effect of fluid in a pipeline. The main water supply device reduces the thermal stratification effect of the fluid in the pipeline by arranging the water supply annular pipe assembly above a thermal sleeve assembly, the main water supply pipe and the thermal sleeve assembly are connected by welding, the risk of fluid emptying in the thermal sleeve assembly and the water supply annular pipe assembly is reduced, and the risk of the occurrence of water hammer is basically eliminated.

Description

technical field [0001] The invention relates to the field of steam generators in pressurized water reactor nuclear power plants, in particular to a main feed water connection device for steam generators in pressurized water reactor nuclear power plants. Background technique [0002] The steam generator is the hub of the primary and secondary circuits of the nuclear power plant. It transfers the heat generated by the reactor to the secondary side to generate steam, which is sent to the steam turbine and drives the generator to generate electricity. The steam after the work done by the steam turbine is condensed in the condenser, and the condensed water enters the steam generator through the main feed water pipeline after passing through the heater and the main feed water pump. [0003] Under the condition of low power and thermal shutdown, the main feedwater ring of the steam generator is filled with water with high temperature, and the low-flow low-temperature feedwater slow...

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Problems solved by technology

[0010] In order to solve the problems of the prior art, the present invention provides a main water supply pipe device for the steam generator of the pressurized water reactor nuclear power plant, which solves the problems in the prior art due to the central line of the main water supply connection pipe and the water supply ring pipe connection pipe, water supply The center line of the ring main pipe is at the same height. Under low power and thermal shutdown conditions, thermal stratification may occur and when the water level of the steam generator is lower than the feed water ring and the feed water connection pipe, the fluid in the feed water ring pipe It will be emptied, and the main water supply ring pipe after emptying is full of steam. If the main water supply is started at this time, technical problems such as water hammer will occur.

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