Pressurized light water type neutron source assembly

Abstract

The invention relates to a pressurized light water type neutron source assembly, concretely a pressurized light water type neutron source assembly of a plurality of primary sources and secondary sources mutually arranged, which is required by starting the nuclear reactor core of an APR1400 pressurized light water reactor of a South Korea standard nuclear power plant model. The pressurized light water type neutron source assembly is characterized by comprising an upper pipe fitting inserting to the upper portion of the nuclear fuel assembly guide pipe of a pressurized light water reactor; a lower pipe fitting inserting to the lower portion of the nuclear fuel assembly guide pipe of a pressurized light water reactor, and composed of a pipe in connection with the lower end portion of the upper pipe fitting, and an end cover sealing the lower end portion of a pipe; and a neutron source unit comprising a plurality of primary sources and secondary sources mutually in series connection in the pipe, wherein neutron source units are mutually arranged under the condition of configuring the secondary sources among the primary sources.

Description

technical field [0001] The present invention relates to a pressurized light water type neutron source assembly, and in more detail, relates to a plurality of primary sources and secondary sources required for starting a nuclear reactor core of a model APR1400 pressurized light water reactor of a Korean standard nuclear power plant. A collection of pressurized light water neutron sources arranged alternately. Background technique [0002] In order to start a nuclear power plant, it is necessary to carry out a chain nuclear reaction in the core of the nuclear reactor. For this reason, the neutron source is installed in the core of the nuclear reactor in the form of an assembly. In order to start the nuclear reactor core, the neutron source assembly includes a primary source and a secondary source, wherein the primary source will be used during the initial test operation of the nuclear reactor core, and the secondary source will be used during the normal operation after the tes...

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Problems solved by technology

[0008] The neutron source assembly, the primary source 2 is provided in the form of a small target pellet, and the fuel rods of the common nuclear reactor core will have a length of about 4m, and for an effective chain nuclear reaction, it is necessary to distribute the neutrons evenly to the fuel rods at the beginning of the chain nuclear reaction, but according to the described technology, it is limited to achieve uniform emission of neutrons, due to the non-uniform emission of neutrons, as the capacity of the pressurized light water reactor increases, the stable chain type nuclear reaction will also be delayed, while creating an obstacle to shortening the start-up time of the reactor

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