JPH0326479Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an impurity injection device for sodium.

(Prior technology) The primary coolant (liquid sodium) circulation system of a fast breeder reactor is equipped with oxygen in order to quickly detect the intrusion of impurities (sodium oxide, sodium hydride, etc.) from the outside caused by an abnormality. Impurity concentration meters such as a hydrogen meter and a hydrogen meter are installed. In order to maintain its accuracy, we check whether the pointer of this impurity concentration meter is operating normally according to the content of impurities contained in the primary coolant (liquid sodium). An impurity dosing device for sodium is provided.

The third example of the conventional impurity injection device for sodium
To explain with the drawing, 1 is a sealed container containing liquid sodium 2 and a cover gas space 3 is formed above it, 4 is an impurity injection nozzle provided at the upper part of the sealed container 1, and 8 is a sealed container that contains impurity 7. Impurity storage container 5 is a gate valve 6a that shuts off the impurity injection nozzle 4 from the impurity storage container 8 on the same atmosphere side.
is a pipe connected to the cover gas space 3 in the sealed container 1, 6b and 6c are pipes connected to the liquid sodium 2 in the sealed container 1, 9 is a hydrogen meter installed in the same pipe 6b, and 10 is the same pipe 6b, the impurity 7 is detected in the liquid sodium 2 in the sealed container 1.
When charging the impurity into the impurity storage container, the cover gas is taken out through the cover gas pipe 6a of the cover gas space 3 in the sealed container 1, the pressure in the cover gas space 3 is reduced to atmospheric pressure, and then the gate valve 5 is opened and the impurity storage container is Impurities 7 in 8 are introduced into liquid sodium 2 in a sealed container 1 through an impurity injection nozzle 4. After the impurities 7 put into the liquid sodium 2 are dissolved in the liquid sodium 2, they pass through the pipe 6b together with the liquid sodium 2 to a hydrogen meter 9 and an oxygen meter 1.
0 and returns to the sealed container 1 through the pipe 6c, but at this time, the amount of impurity 7 input from the impurity storage container 8 into the sealed container 1 and the amount of change in the output of the hydrogen meter 9 and oxygen meter 10 are calculated. Compare the impurity concentration meters (impurity measurement devices) 9 and 10 to check whether the indicators are operating normally according to the content of impurities contained in the liquid sodium, and determine the impurity concentration. A total of 9 and 10 are calibrated.

(Problems to be solved by the invention) In the impurity injection device for sodium shown in FIG. , is oxidized, and the components of the impurity 7 change. Moreover, since the impurities (sodium oxide, sodium hydride, etc.) 7 are granular and light, they adhere to the inner wall surface of the sealed container 1 when they are added, and the entire amount does not enter the liquid sodium 2 in the sealed container 1. Since there will be an error between the values indicated by the concentration meters 9 and 10 and the pre-calculated impurity input amount,
The calibration of impurity concentration meters 9 and 10 lacked precision.

(Means for Solving the Problems) The present invention addresses the above problems, and includes a sealed container containing liquid sodium with a cover gas space formed above the container, and a gate at the top of the sealed container. It has a glove box connected via a valve, a pipe connected to the liquid sodium in the sealed container, and an impurity measuring device installed in the pipe, and measures impurities introduced from the glove box into the sealed container. It is related to an impurity injection device for sodium, which is characterized by being wrapped in solid sodium and made into a capsule, and its purpose is to prevent changes in the composition of impurities that occur when impurities are introduced and to reduce the amount of input due to adhesion of impurities. An object of the present invention is to provide an improved impurity injection device for sodium that can prevent the above problems and improve the calibration accuracy of an impurity measuring device.

(Function) The sodium impurity injection device of the present invention is constructed as described above, and after creating an inert gas atmosphere in the glove box and covering impurities with a solid sodium capsule, the gate valve is opened. Impurities are poured into the liquid sodium in a sealed container from inside the glove box. Therefore, impurities do not react with oxygen in the atmosphere, and no change in composition occurs. In addition, as described above, after the impurities are covered with a solid sodium capsule, the gate valve is opened and the liquid sodium is poured into the sealed container from inside the glove box, so that the impurities do not adhere to the inner wall of the sealed container, etc. The entire amount is poured into liquid sodium in a sealed container. In this way, there is no change in the composition of impurities that occurred when the impurities were added, nor a decrease in the input amount due to adhesion of impurities, and the difference between the value indicated by the impurity measurement device's guideline and the pre-calculated impurity input amount does not occur. No errors occur, improving the calibration accuracy of the impurity measuring device.

〔Example〕

Next, the sodium impurity injection device of the present invention will be explained with reference to an embodiment shown in FIGS. 1 and 2.
11 in the figure is a sealed container containing liquid sodium 12 and forming a cover gas space 13 above it;
14 is an impurity injection nozzle provided at the upper part of the sealed container 11; 16 is an impurity injection container connected to the upper part of the impurity injection nozzle 14 via a gate valve 15;
16a is a handle for impurity injection provided on the impurity injection container 16; 18 is a glove box connected to the upper part of the impurity injection container 16 via a gate valve 17; 19 is a work glove protruding into the glove box 18; 20 is the same glove box 18
The peephole 20 is closed by a glass plate. In addition, 21a is the sealed container 1
1, a cover gas supply/discharge pipe connected to the cover gas space 13; 21b, 21c are pipes connected to the liquid sodium 12 in the sealed container 11; 22 is a hydrogen meter (impurity measuring device) provided in the same pipe 21b; 23
is an oxygen meter (impurity measuring device) provided in the same pipe 21b, 25 is a pipe that bypasses the gate valve 15 and connects the cover gas space 13 of the sealed container 11 and the impurity injection container 16, and 24 is the same pipe. a valve provided in the pipe 25; an inert gas supply pipe 26 supplying inert gas to the glove box 18;
27 is a valve installed in the inert gas supply pipe 26, 28
is a pressure gauge installed in the same inert gas supply pipe 26, 29
In the vacuum system pipe connected to the glove box 18, 30 in FIG. 2 is an impurity, and the impurity 30 is
It is composed of an impurity body 30a such as sodium oxide or sodium hydride, and a solid sodium capsule 30b covering the impurity body 30a.

Next, the operation of the impurity injection device for sodium shown in FIGS. 1 and 2 will be explained in detail. While the inside of the glove box 18 is in an inert gas atmosphere, put your hand into the work glove 19, look inside the glove box 18 through the peep hole 20, make a capsule 30b from solid sodium, and remove the impurity body 30a. Cover with capsule 30b. After the impurity body 30a is covered with the solid sodium capsule 30b in this way, the gate valve 17 is opened and the impurity 30 is put into the impurity injection container 16, the gate valve 17 is closed, the valve 24 is opened, and the sealed container is placed. 11 and the impurity injection container 16 to the same pressure, then open the gate valve 15,
Impurity injection handle 16 of impurity injection container 16
The impurity 30 is thrown into the liquid sodium 12 in the sealed container 11 by rotating the a.

(Effect of the invention) The sodium impurity injection device of the present invention is constructed as described above, and after creating an inert gas atmosphere inside the glove box and covering impurities with a solid sodium capsule, the gate valve is opened. Then, pour the impurities from inside the glove box into the liquid sodium in the sealed container. Therefore, impurities do not react with oxygen in the atmosphere, and no change in composition occurs. Further, as described above, after the impurities are covered with a solid sodium capsule, the gate valve is opened and the liquid sodium is introduced from inside the glove box into the liquid sodium in the sealed container, so that the impurities do not adhere to the inner wall surface of the sealed container. In this way, the entire amount of impurities to be added is added to the liquid sodium in the sealed container, and the impurity concentration of the liquid sodium becomes the planned value, so the difference between the value indicated by the impurity measuring device's guideline and the planned value is calculated. Once calibrated, the pointer on the impurity measuring device will indicate the correct impurity concentration.
Therefore, according to the present invention, extremely high precision calibration is possible.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing an embodiment of the impurity injection device for sodium according to the present invention, Fig. 2 is a vertical side view showing impurities, and Fig. 3 is a system diagram showing a conventional impurity injection device for sodium. . 11... Sealed container, 12... Liquid sodium,
13... Cover gas space, 15, 17... Gate valve, 18... Globe box, 21b... Piping, 22, 23... Impurity measuring device, 30... Impurity, 30a... Impurity body, 30b... capsule.

Claims (1)

[Scope of utility model registration request] a sealed container containing liquid sodium and forming a cover gas space above the sealed container; a glove box connected to the upper part of the sealed container via a gate valve; and piping connected to the liquid sodium in the sealed container; An impurity injection device for sodium, comprising an impurity measuring device installed in the same piping, and impurities introduced from the glove box into the sealed container are wrapped in solid sodium to form a capsule.