BWR type nuclear power generator and construction method

Abstract

The present invention provides a boiling water reactor nuclear power plant in which a reactor core support plate, upper grid plate, and a reactor core consisting of fuel assemblies supported by these plates are provided in the inner base portion of a nuclear reactor pressure vessel. Control rod guide tubes and a reactor core shroud are positioned over the upper grid plate, and a control rod drive mechanism is provided further above same, whereby the control rods can be inserted from above the reactor core, and natural circulation of cooling water inside the reactor can be achieved by means of a chimney effect of the control rod guide tubes. According to the above structure, there can be provided a compact and economical nuclear power plant.

Description

technical field [0001] The present invention relates to a power plant using a natural circulation type boiling water nuclear reactor, in particular to a boiling water nuclear power plant and its construction method which are suitable for compact structure, variety of output requirements, improvement of economy and the like. Background technique [0002] In the prior art, as the composition of the nuclear reactor pressure vessel and the reactor internal structure of the boiling water type atomic power station, the scheme of circulating the reactor water is mainly adopted through the driving of the movable pump arranged at the lower part of the nuclear reactor pressure vessel, and the reactor water is circulated through the external pump. A scheme in which a movable pump is used to drive a jet pump, etc., and a scheme in which a forced circulation method is used. Furthermore, the control rods for controlling the output are inserted from the lower part of the nuclear reactor pr...

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Problems solved by technology

[0030] Moreover, when using the nuclear reactor container 422 as the upper part of the pressure suppression pool, and using the existing forced circulation nuclear reactor for the nuclear reactor pressure vessel 423, the height of the nuclear reactor pressure vessel 423 is about 20 m. The upper part of the container 423 is led out, led back to the bottom of the pressure suppression pool 433, and led to the turbine, so there is an economical disadvantage of increasing the number of piping materials and dry well space

[0031] Furthermore, in the existing buildings of boiling water type nuclear power plants, generally, equipment with different seismic levels of the nuclear reactor building and the turbine building are accommodated, so separate seismic design and construction are required since they are carried out in separate buildings. design, and, because of the increase in plane space, there are economical problems

Furthermore, it is difficult to achieve a standardized design because the design criteria (specifications, seismic conditions, etc.) of nuclear power plant buildings are different at each construction site.

Furthermore, there is a problem that the work volume and construction period of the nuclear power plant building construction become very large

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