JPH09178879A - Local output area monitoring and calibrating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify building layout and skeleton structure by setting the calibrating mechanism for a local output area monitor within a reactor lower containment. SOLUTION: A driving device part 17 for driving a TIP detector 5, an indexing device part 18 for selecting the insertion of the detector 5 to each local output area monitor detector 6, and a shielding vessel part 19 for shielding and storing the detector 5 are provided on the floor surface within a reactor lower containment 11, whereby a local output area monitor calibrating mechanism 16 is constituted. A detector guide pipe 10 for connecting the detector 6 to the mechanism 16 is linear, extended through the center part so as not to obstruct the rotation of a control rod driving mechanism replacing platform 24, and mounted on a platform lower part 25 in such a manner as to be removable. An exclusive control board 20 on the outside of a reactor containment 2 is operated, whereby the detector 5 is traveled within the guide pipe 10 by the device part 17 and device part 18 of the mechanism 16, and inserted to the detector to perform a calibrating operation. According to this method, the structure of the boundary of the containment 2, the layout of a building 1, and skeleton structure can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to nuclear reactor instrumentation in a nuclear power plant, and more particularly to a local power range monitor calibration device for a local power range monitor system.

[0002]

2. Description of the Related Art A moving in-core instrumentation system (Travesing IncoreProbe, hereinafter referred to as T) in a boiling water nuclear power plant
2) and its local output area monitor calibration device, as shown in the configuration diagram of FIG.
A dedicated TIP drive device chamber 3 and a TIP chamber 4 are provided outside the reactor containment vessel 2 in FIG.

In each of the TIP driving device chamber 3 and the TIP chamber 4, a TIP detector 5 and a detector driving device 7 to be inserted into a local output area monitor detector 6, and a TIP driving device 7 are provided.
The detector 5 is inserted into the furnace 8 to shield the high dose TIP detector 5 and to install a shielding container 9 for storage.

In addition, a TIP that drives the TIP detector 5
The guide tube 10 is used for the detector driving device 7 in the TIP driving device chamber 3.
To the local output area monitor detector 6 in the lower reactor containment vessel 11 and penetrates the reactor containment vessel 2. Therefore, the isolation valve 12 and the blast valve 13 for backup are inserted in the penetration portion. ing.

A TIP indexing device 15 is installed on the ceiling of the staff access tunnel 14 of the reactor lower containment vessel 11, which is the intermediate route of the TIP guide tube 10. Furthermore, from the detector driving device 7 to the local output area monitor detector 6
Since the traveling distance is long, the system is equipped with an automatic switching system that travels at a high speed up to a halfway and the local output area monitor 6 runs at a low speed for the purpose of shortening the calibration time.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Since the P detector 5 is installed inside the reactor building 1 and outside the reactor containment vessel 2, it is necessary to isolate the P detector 5 from the reactor containment vessel 2. In addition, precise processing such as installation of the blast valve 13 was required.

Further, since the traveling distance from the detector driving device 7 to the local output area monitor detector 6 is long, it takes a lot of time for calibration, and since the mutual installation positions cannot be connected in a straight line, the TIP guide There was a problem that the TIP detector 5 deteriorated quickly due to friction with the tube 10. Therefore, TI
The large amount of materials for the P detector 5 and the TIP guide tube 10,
There has been a problem that the frequency of maintenance management and parts replacement becomes high, and further, the radiation exposure of workers during replacement work increases.

An object of the present invention is to shorten the TIP guide tube and to form a boundary structure of the reactor containment vessel by integrally installing the calibration mechanism of the local power range monitor in the reactor containment vessel. It is an object of the present invention to provide a local output area monitor calibration device which eliminates parts, further improves reliability and shortens calibration time, and mitigates deterioration of the TIP detector.

[0009]

In order to achieve the above object, a local power range monitor calibrating apparatus according to the invention of claim 1 is a local power range monitor system installed in a boiling water nuclear reactor, wherein: The calibration mechanism of the local power range monitor is installed in the reactor containment vessel. The TIP detector is driven in the lower containment vessel of the reactor from the calibration mechanism of the local power range monitor without passing through the boundary of the reactor containment vessel.

According to a second aspect of the present invention, there is provided a local output area monitor calibrating device in which a detector driving device, a detector shielding container, and a detector indexing device of a device constituting a calibration mechanism of the local output area monitor are integrated. Is characterized by. A TIP is provided by a calibration mechanism of a local output area monitor including a detector driving device, a detector shielding container, and a detector indexing device which are integrally configured.
Drive the detector.

According to a third aspect of the present invention, there is provided a local output area monitor calibrating device in which a detector guide tube connecting the calibration mechanism of the local output area monitor and the local output area monitor is linearly arranged. The TIP detector is driven through the linear detector guide tube by the calibration mechanism of the local power range monitor.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. Note that the same components as those of the above-described related art are denoted by the same reference numerals, and detailed description thereof will be omitted. As shown in the configuration diagram of FIG. 1, the local output area monitor calibration device of the present invention is a detector for driving a TIP detector, which is a local output area monitor calibration mechanism 16, on the floor surface of the lower reactor containment vessel 11. The drive unit 17, the index unit 18 for selecting the insertion of the TIP detector into each local output area monitor detector 6, and the shield container unit 19 for shielding and storing the TIP detector 5 are integrated. Deploy.

Each device of the calibration mechanism 16 for the local output area monitor installed in the lower reactor containment vessel 11 is provided only as a drive unit, and the control operation unit is provided as a dedicated control panel 20 outside the reactor containment vessel 2. doing. Further, the control cable connecting the calibration mechanism 16 and the dedicated control panel 20 is the reactor containment vessel 11
An electric conduit 21 laid inside the connection vessel 22 connects the lower and upper parts of the reactor containment vessel 2 to each other through a connecting communication hole 22 and a cable penetration 23 in the reactor upper containment vessel.

Further, the detector guide tube 10 connecting each local output area monitor detector 6 and the calibration mechanism 16 is linear, and penetrates through the central portion of the control rod drive mechanism replacement platform 24 so as not to hinder the turning. Installed at the bottom of the platform and removable at the bottom 25 of the platform.

Next, the operation of the above configuration will be described. TIP detector 5 to each local output area monitor detector 6
The operation of inserting and traveling is performed by operating the dedicated control panel 20 outside the reactor containment vessel 2. The TIP detector 5 runs in the detector guide tube 10 by the detector driving device unit 17 and the indexing device unit 18 in the calibration mechanism 16, and the local output region monitor detector 6
And the calibration operation is performed.

At this time, the TIP detector 5 is the detector guide tube 10
Is short and travels linearly, the time required for the calibration operation is short, the calibration work efficiency is high, and the friction during traveling is small, so that the deterioration of the TIP detector 5 and the like is alleviated. Further, since the penetrating portion of the reactor containment vessel 2 for the TIP guide tube 10 is not required, the airtightness of the reactor containment vessel 2 can be easily maintained, so that the isolation valve 12 and the blast valve 13 are not installed. The structure and reliability of the boundary in the reactor containment vessel 2 are improved, and the layout and the structure of the reactor building 1 can be simplified.

Further, since the calibration mechanism 16 has the constituent equipment integrated, the installation and maintenance work is simplified, the exposure of the worker is reduced, and the materials such as the TIP guide tube 10 are reduced, so that the radioactive waste is reduced. The occurrence of is also reduced. Incidentally, the shielding container portion 19 for shielding the detector, for example, is embedded in the floor skeleton,
While the TIP detector 5 is not running, the TIP detector 5
By stopping the above, the shielding container portion 19 reduces the exposure of the worker who goes in and out of the reactor lower containment vessel 11 at the time of periodic inspection and the like.

[0018]

As described above, according to the present invention, the local output area monitor calibration device is excluded from the boundary of the reactor containment vessel, and the dedicated drive unit room is not required, and the building layout and the structure of the structure are simplified. . Further, since the detector traveling distance from the detector driving device to the local output region monitor is short and the detector guide tube is linear, the calibration time is shortened and the deterioration of the detector is mitigated. Further, during maintenance, the frequency of replacement of the TIP detector is increased, and the exposure of workers due to replacement work is reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a local output area monitor calibration device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional local output area monitor calibration device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reactor building, 2 ... Reactor containment vessel, 3 ... TIP drive room, 4 ... TIP room, 5 ... TIP detector, 6 ... Local output area monitor detector, 7 ... Detector drive system, 8 ... Reactor Of which
9 ... Shielding container, 10 ... TIP guide tube, 11 ... Reactor lower containment vessel, 12 ... Isolation valve, 13 ... Explosion valve, 14 ... Staff access tunnel, 15 ... TIP indexing device, 16 ... Local output area monitor calibration mechanism , 17 ... Detector drive unit, 18 ... Indexing unit, 19
… Shielded container part, 20… Dedicated control panel, 21… Conduit, 22… Communication hole, 23… Cable penetration, 24… Platform for replacing control rod drive mechanism, 25… Lower part of platform.

Claims (3)

[Claims] 1. A local power range monitor calibration system for a local power range monitor system installed in a boiling water reactor, wherein a calibration mechanism for the local power range monitor is installed in a reactor lower containment vessel. . 2. The local output area monitor according to claim 1, wherein the detector driving device, the detector shielding container, and the detector indexing device of the device constituting the calibration mechanism of the local output area monitor are integrated. Calibration device. 3. The local output area monitor calibration device according to claim 1, wherein a detector guide tube connecting the calibration mechanism of the local output area monitor and the local output area monitor is linearly arranged.