JPS62108193A - Neutron detector assembly for nuclear reactor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a neutron detector assembly for a nuclear reactor.

[Prior Art] FIG. 4 shows a conventional neutron detector assembly.

In the figure, (6) is an inorganic insulating group that has radiation resistance for applying voltage to the neutron detector (8) and extracting signals.
rated) cable, and the cable plugs (3) and 7
It passes through the lunge (2) and comes out at the upper end. A connector (1) is connected to the tip thereof. (11) This is a pipe for connecting the shield plug (3) and the detector protection tube (7). Note that (3) the shield plug is filled with gamma ray blocking material such as concrete.

[Problem to be Solved by the Invention 1] In the conventional neutron detector assembly shown in FIG. 4, the 1M ecaple snakes inside the connecting pipe, so that the external view of the metal cable does not meet the inner surface of the connecting pipe. If they come into contact with each other, they can cause induced noise, or in the event of an earthquake, the goople can hit the inner surface of the pipe and generate impact noise, which can cause problems in neutron measurement.

This invention was made to solve the above-mentioned problems, and it holds the group connected to the neutron detector while insulating it, and penetrates the shore plug and 7 langes (naturally, in this case The purpose is to create a device that is free from the influence of induction noise, impact noise, etc. caused by the goople by taking it out from the top (which is insulated from the Shahei plug and the 7-lunge).

[Hands for solving the problem Jiffil] The neutron detector assembly for a nuclear reactor according to this invention is connected to the neutron detector and held insulated by a goople-t ceramic insulator so that the neutrons can escape to the outside. It is something.

[Function j The neutron detector assembly for a nuclear reactor in this invention is as follows:
By holding the cable connected to the neutron detector while insulating it with a ceramic insulator and letting it escape to the outside, it is possible to prevent induced noise caused by contact with the detector assembly structure and during earthquakes. It is possible to prevent impact noise and the like generated when the cable collides with the detector assembly structure.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, (1) is the connector attached to the end of the cable. (2) is the 7-lunge for gamma ray protection, and (3)
) is also a shield plug for shielding gamma rays, (4) is a detector protection tube (7) and a shield plug (3) is a shield plug for shielding gamma rays.
), (5) is the plate for fixing the cable and the support rod, (6) is the Ml cable connected to the detector, (the force is (8) the detector and the protection that protects it. It is a tube. Figures 2 and 4I7IJ3 are A [
It is a side view and a top view showing details of S. In FIGS. 2 and 3, (9) is a ceramic spacer for insulating and holding the Ml cable, and (10) is a plate for pressing the ceramic spacer.

In the wooden neutron detector assembly, the Ml cable connected to the neutron detector is held while being insulated with a ceramic spacer, and the shield plug and 7 langes are inserted into the upper part of the detector assembly. It is possible to prevent noise induced by contact with a structure and impact noise generated when a cable collides with a detector assembly structure during an earthquake.

In the above embodiment, an example is shown in which two MII cables and two support rods are used, but the same effect can be obtained even when there is one or three groups by providing the same ceramic insulator.

Alternatively, three or four support rods may be used.

〔Effect of the invention〕

As described above, according to the present invention, the cable connected to the neutron detector can be held and taken out to the outside while being insulated with an insulating ceramic, and the influence of irradiation noise, impact noise, etc. can be avoided through the cable. There is an effect that can be obtained with a device that does not have a

[Brief explanation of drawings]

FIG. 1 is a structural diagram showing a neutron detector assembly for a nuclear reactor according to an embodiment of the present invention, and FIGS. 2 and 3 are detailed views of FIG. 1. FIG. 4 shows a conventional detector assembly. In the figure, (1) is a connector, (2) is a 7-lunge, (
3) Hashiyahei plug, (4) is the support rod, (5) is the plate, (6) is the MIl cable, (7) is the detector protection tube,
(8) is the detector, (9) is the ceramic spacer, (10
) is the holding plate of the ceramic spacer, and (11) is the connecting pipe. The same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] In a neutron detector assembly for a nuclear reactor in which a cable connected to a neutron detector passes through a gamma ray shielding plug and is taken out from the upper end of the shielding plug, an assembly structure connects the cable between the plug and the neutron detector. A neutron detector assembly for a nuclear reactor, characterized in that a cable and a detector assembly structure are insulated by a ceramic insulator supported in the neutron detector assembly.