Special testing device for small measuring chamber of nuclear power plant reactor cavity

Abstract

The invention relates to a small measuring chamber of a nuclear power plant reactor cavity and also relates to a special testing device, which belong to the technical field of nuclear power plant engineering. The lower surface of a flange ring of the small measuring chamber is fixedly connected with a supporting ring; the lower end of the supporting ring extends out of a groove bottom ring inwards in a radial direction; the inner circle of the groove bottom ring is fixedly connected with a lifting basket protective cylinder; an inner hole of the flange ring is a conical hole with the big upper part and the small lower part; one side of the upper surface of the flange ring is hinged with one end of a flange cover; a pressing bolt penetrating through a through hole in the other end of the flange cover is mounted in a screw hole in the other side of the upper surface of the flange ring; the middle part of the flange cover extends out of a cone frustum matched with the conical hole downwards; a recess, side walls of which in at least two rings are vertical to the conical surface, is formed in the conical surface of the cone frustum; a circular-section sealing ring is embedded into the recess; the diameter of the sealing ring is matched with the width of the recess; and the ratio between the depth of the recess and the width of the recess is 0.7-0.9. After a lifting basket is put and the flange cover is covered, the conical surface can be enabled to generate a tendency of sticking to the surface of the conical hole, so that the sealing ring slightly protruding out of the recess is pressed to generate an ideal anti-leakage sealing effect.

Description

technical field [0001] The invention relates to a nuclear reactor facility, in particular to a nuclear power plant reactor chamber measuring cell, and also to a special test device thereof, belonging to the technical field of nuclear power plant engineering. Background technique [0002] In a nuclear power plant, there are 8 channels for the RPN (external nuclear measurement system) measurement cavity at the bottom of the reactor cavity. In order to shield the neutron radiation from the channel to the top of the reactor, a "neutron absorption plug" made of special material is used to block the channel. The device that houses the "neutron-absorbing plug" is a measuring cell with a flip-up flange cover. When the reactor was refueled, the reactor cavity was filled with boron water, and the top of the measuring cell was submerged in boron water. [0003] Therefore, the measuring cell has two functions: one is to open and close the flange cover at the top, and to store the gond...

AI Technical Summary

Problems solved by technology

According to the applicant's knowledge, the airtight structure of the measurement chamber still needs to be improved, and there is no special facility for the airtight test of the measurement chamber

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