Structure for measuring neutron flux density of light water reactor

The invention relates to a structure for measuring neutron-flux density of a light-water reactor. The structure comprises a plurality of pull rods, the pull rod comprises a rod body, a pull rod handle and a pull rod head; and the pull rod handle and the pull rod head are installed at the two ends of the rod body respectively. An easy-to-activate substance is arranged in the rod body; and the plurality of pull rods are respectively inserted into different fuel assemblies of the light-water reactor so as to measure the in-reactor relative neutron flux distribution through the easily activated substances. The structure has the beneficial effects that the pull rods with the easy-to-activate substances are respectively inserted into different fuel assemblies, so that the relative neutron flux density and distribution in the reactor are measured through the easy-to-activate substances, and the structure can be applied to data measurement of a swimming pool type light-water reactor; each set of assembly holes is pro