JPS58169095A - Radioactive corrosion product catching device - 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 [Technical Field of the Invention] The present invention relates to a radioactive corrosion method that processes radioactive corrosion products contained in a conductive liquid such as liquid sodium or liquid sodium φlium used as a coolant in a serial breeder reactor. This invention relates to a product capture device.

[Technical background of the invention]

In fast breeder reactors, a conductive alkaline earth metal, typically liquid sodium, is generally used as a coolant. And such a liquid metal coolant has atoms f′! ! ! The mirror heated in the reactor core in Masunai is passed through the primary cooling system installed outside the reactor vessel, and then returned to the reactor vessel for circulation.

By the way, in the case of fast breeder reactors, the nuclear fuel element tubes and core structures are usually made of stainless steel.
When these constituent materials are exposed to neutron irradiation, the constituent materials Vct, such as iron and cobalt, which are rare, cause a nuclear reaction, and radioactive nuclides such as manganese-54, cobal-60, cobalt-58, etc. On the other hand, since alkaline earth metals are used as coolants as mentioned above, the stainless steel that is the material for the distribution will still be corroded. Therefore, the above radionuclides are rich friends so-called radioactive! F4 particles will be mixed into the coolant.

The radioactive radiation mixed into the coolant is carried to the trough of the coolant, and is deposited in the 111 direction of the primary cooling system. In this way, m of the primary cooling system
The radioactivity of the radioactive corrosion products deposited on the mountains is harmful to machinery such as pumps, heat converters, pulp, flow needles, etc. The commission will be given to those responsible for maintaining and repairing the piping that has been damaged since then.

%VC, manganese-54, cobalt-60, copal)-
58il has a large amount of raw noodles and has a long half-life, so this has a big impact.

Therefore, in order to eliminate such problems, we developed a method for using nickel, which has the property of efficiently capturing the radioactive nuclei of cobalt-6(1) in high-temperature liquid metal sodium. It is being considered to install radioactive corrosion product packaging W inside eight nuclear reactors to take advantage of the presence of radioactive corrosion products.

This radioactive hazardous product capture device has a plurality of elements containing a capture material such as nickel placed above the reactor core, facing the coolant outlet of the reactor core, and collects the coolant discharged from the reactor in a stream. Radioactive nuclides are captured by direct Wk contact with the capture material.

[Intermediate points of background technology]

# In equipment such as Jl, radioactive lN &
★To capture the nuclide of generation intelligence, make the surface of contact between the capture material and the coolant larger than t", and make all the coolant come into uniform contact with the capture material. It is necessary.

However, in the platform where the coolant flows between the captured materials, a laminar flow is formed near the surface of the captured materials due to the viscous effect of the coolant.
A so-called boundary layer is formed. There is little exchange of position between the coolant forming this boundary layer and the coolant flowing outside the boundary layer.

Therefore, the probability that the coolant flowing through the center of the channel formed between the trapping materials will come into contact with the trapping materials is small. Therefore, the radioactive corrosion products in the coolant flowing through the central part will be exclusively diffused through the boundary N and will be adsorbed by the M4 material, but the radioactive corrosion products will be diffused in the boundary layer. The speed is very slow VC, so the capture efficiency is low, and the overall efficiency of the verb and loading is low.

[Purpose of the invention]

The present invention was made in view of such circumstances KWI,
The purpose of this is to force the flow of conductive liquid such as 1/IL sodium through the 111#Ii material barrier into K
This trap allows the boundary layer to be made into a 1# film and peeled off.
The goal is to provide the necessary equipment.

[Summary of the invention]

The radioactive direct product fllli kneading device of the present invention applies a rotating magnetic field that rotates around the axis of the conductive liquid flow path to a conductive material such as liquid sodium flowing between capture materials. It is characterized by becoming.

〔Effect of the invention〕

With such a configuration, an eddy current is generated in the conductive liquid such as liquid natrifuge flowing between the auxiliary wires due to the magnetic field in the direction perpendicular to the direction in which the conductive liquid flows.◇ The waves of the conductive liquid are prevented from being forcibly deflected by the interaction of the eddy currents and the magnetic field. Furthermore, since the Joki magnet is rotating around the axis of the conductive liquid flow path, as a result, the conductive liquid A can cross the path D while rotating spirally. .

Because of this, the boundary layer formed near the surface of the capture material is disturbed, and this boundary layer becomes thin or peels off. Therefore, it is possible to increase the MIi that the radioactive corrosion products in the conductive material flowing in the central part between the planting materials come into contact with the trapping material, and since the boundary no is cut off by folding, the above-mentioned central S The time required for the radioactive corrosion product nuclides in the coolant flowing through the boundary 111# to spread and reach the capture material can be shortened. Therefore, the nuclides of the radioactive corrosion products in the coolant containing the center S are also efficiently captured by the capture material, and eventually K in the coolant.
The radioactive corrosion produced by many people was reported to have been reported to all 1i11. Therefore, by installing this mm device at the coolant outlet of the reactor hot water of a fast breeder R, it is possible to stop the radioactive corrosion products from flowing to the primary cooling system, thereby reducing the cost of maintenance and repair work for this system. Contributed to the 76th edition.

[Implementation of qi4] Side lkA is a schematic configuration diagram of a radioactive corrosion product sleeve a device according to an embodiment of the present invention. This radioactive corrosion product capture device is divided into two main parts: a liquid (IJ rim) which is a coolant for a fast breeder reactor; For example, a stainless steel pipe t1, a capture body 2 for capturing radioactive nuclei S placed inside this pipe 1, and a pipe provided outside of the Joki pipe f1 where the 11 catch body 2 is located. Comprised of a rotating magnetic field generator 3 that applies a rotating magnetic field centered on the JO axis axis IA.
has been done.

As shown in FIG. 2, the capture body 2 is made by cutting a thin nickel plate into a cylindrical shape so that the cross section has a tiled circular shape.
It is constructed by arranging 62 trapping materials 4 concentrically with the power distribution 1, so that the front conductive material 14P flows through a vertically long barrier @S formed between the trapping materials 4. It is fixed to the inner surface of the pipe 1 by a fastener (not shown).

On the other hand, the rotating magnetic field generating device 3 includes a cylindrical yoke 6 arranged concentrically with the outside of the pipe 1 and the IK fitting 1, and this yoke 6.
Three magnetic hooks 7 a + 7 b + are protruded from the inner surface of t1 at an opening angle of 120 f toward the fine #M@ of arrangement t1.
7 c and these magnetic ik7 a t 7 b, 7c
For example, three broken coils 8, 8b, le and these coils 8m, #
b, consists of a three-phase 5e current power supply 9 that applies three-phase AC voltage to one end of the three Y-connected JICs. With this configuration, when the three-phase AC voltage 9 is turned on, When liquid sodium, which is the coolant for the serial growth station, is passed through the pipe 1 as the conductive liquid P as shown by the arrow in Fig. At this time, at the position where the prosthesis 2 is provided, the gap j is perpendicular to the flow direction and centered on the axis of the pipe 1, as shown by the arrow in the figure fg2. It is subjected to a rotating magnetic field t.

For this reason, eddy currents are generated in the liquid sodium around the 2a field above and in a plane perpendicular to the direction of the 2 magnetic pestle, that is, a plane parallel to the flow direction of the powdered sodium. Therefore, the liquid sodium flowing at the location where the N wire rod 2 is installed is subjected to an electromagnetic force according to Freyden's left-hand rule, and the flow is forcibly deflected by this force.Furthermore, the above magnetic field is Since it rotates around the axis of the pipe 1, the liquid sodium is formed by the capture material 4 while forming a rotational flow t:M that rotates around the axis. Therefore, the boundary layer formed near the surface of the capture material 4 is inevitably disturbed and may be peeled off or mixed into the liquid sodium. The radioactive corrosion products 41i1111K are efficiently captured by the capture material 4, which takes the form of the capture body 2. Therefore, if this device is installed in the reactor volume cooling LJK, it will be possible to prevent the radioactive contaminants generated in the reactor (b) from flowing to the primary cooling system, so maintenance and repair of this thread can be carried out. It can contribute to making the work easier.

In addition, in this implementation, the trapping body xt is constructed by arranging a large number of trapping materials 4 in the shape of a multi-conductor cylinder so that water can be collected between the large number of longitudinal traverses. Contact between the capture material 4 and the coolant] 18[
It is possible to make the above-mentioned caressing action more effective as a VC because it is possible to increase the volume of the TV.

Therefore, this @ side is not limited to the above-mentioned embodiment V. In the examples, nickel was used as the capture material, but nickel alloys, stainless steel with nickel plating on the surface, nickel alloys with nickel plating on the surface, or combinations of these may also be used. Good too.

[Brief explanation of the drawing]

The fringe is the radioactive corrosion generated I# according to one embodiment
This is a schematic configuration diagram showing a partially cutaway capture device, WJ2.
The figure is a sectional view taken along the line AA- in FIG. 1 and viewed in the direction of the arrow. DESCRIPTION OF SYMBOLS 1... Piping, 2... Trap body, 1... Rotating magnetic field generator, 4... Merchandise material, 5... Seki-1i... Yoke,
7a. Ib, rc...-Magnetic pole, am, Bby a
e Middle: Fill, 9... Three-phase AC power supply, P... Conductive liquid. Applicant's agent Patent attorney Takeshi Kinko Figure 1

Claims (1)

[Claims] a channel for guiding a conductive donated body mixed with radioactive corrosion products; a capture body disposed within the channel to adsorb and polarize the nuclide of the radioactive corrosion product; and at least the capture body in the channel. A device for trapping radioactive deceivers, comprising: means for applying a magnetic field that rotates around the axial edge of the R path to a region where the R path is located.