JPH0810272B2 - Reactor well water treatment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention, for example, at the time of refueling or periodic inspection, after purifying the pool water of the reactor well pool and the equipment temporary pool by drainage purification, The present invention relates to a reactor well water treatment device that stores water in a condensate storage tank.

(Prior Art) Generally, a nuclear reactor in a nuclear power plant has about 1
Regular inspections and refueling are performed at a rate of once. At this time, the reactor well pool and the temporary equipment pool are filled with water, but after the fuel is exchanged, the stored water is drained, radioactively treated and collected in the condensate storage tank. .

That is, the already proposed reactor well water treatment apparatus is configured as shown in FIG.

In FIG. 4, the bottoms 2a, 3 of the reactor well pool 2 and the temporary equipment pool 3 which are substantially integrated with the pressure vessel 1 are shown.
The a and the condensate water storage tank 4 are connected by a weld drain pipe 5, and an opening / closing valve 6, a purified water system pump 7, a super desalination device 8 and a partition are provided on the pipe line of the weld drain pipe 5. The valve 9 is provided in sequence. Further, the well drain pipe 5 upstream of the on-off valve 6 and the condensate water storage tank 4 are branched pipes.
The first sluice valve 11,
A turbine condenser hot well 12, a filter desalting device 13 and a second sluice valve 14 are provided. Further, the pressure vessel 1
Is connected to the liquid waste treatment system 15 by a connecting pipe 16, and a drain valve 17, an opening / closing valve 18, a purified water system pump 19, and an excessive desalination system are installed in this connecting pipe 16 in order from the upstream side. A device 20 and a sluice valve 21 are provided.

On the other hand, the condensate storage tank 4 and the liquid waste treatment system 15 are connected by a connecting pipe 23 having an opening / closing valve 22, and the pool water treated by the liquid waste treatment system 15 is It is adapted to be stored in the condensate storage tank 4.

On the other hand, between the upper part and the lower part of the pressure vessel 1,
A circulation path 24 is connected, and the circulation path 24 is provided with a first opening / closing valve 25, a residual heat removal system pump 26, and a second opening / closing valve 27. In addition, the circulation path 24 on the upstream side of the first opening / closing valve 25
A bypass pipe 29 having a bypass valve 28 is provided between the connection pipe 16 and the upstream side connection pipe 16 of the on-off valve 18, and the downstream side of the residual heat removal system pump 26 and the liquid waste treatment system. 15
And are connected by a connecting pipe 31 equipped with a gate valve 30.

Therefore, in the reactor well water treatment device described above, the reactor well pool 2 and the temporary equipment pool 3 are used after the replacement of the fuel and the like.
When draining the pool water of and collecting it in the condensate storage tank 4,
(1). The pool water of both pools 2 and 3 is the on-off valve 6 above.
And means for recovering from the well drain pipe 5 to the condensate storage tank 4 through the excessive desalination device 8 by opening the sluice valve 9 and driving the purified water system pump 7.

(2). The pool water of both pools 2 and 3 passes through the turbine condenser hot well 12 and the super desalination device 13 of the branch pipe 10 branched from the weld drain pipe 5 and the condensate storage tank 4
Means to collect.

(3). The pool water of both pools 2 and 3 is driven to the purification system pump 19 on the connecting pipe 16 connected to the pressure vessel 1 to pass through the over desalination device 20 to the liquid waste treatment system 15. Means for supplying and purifying with this, and then collecting in the condensate storage tank 4.

(4). The pool water of both pools 2 and 3 drives the residual heat removal system pump 26 of the circulation path 24 connected to the pressure vessel 1 and opens the sluice valve 30 to form a connecting pipe.
It is supplied to the above liquid waste treatment system 15 through 31 and
After purification, it is carried out by means of collecting the condensate storage tank 4 or the like.

(Problems to be Solved by the Invention) However, since the first recovery treatment means in the reactor well water treatment apparatus described above does not pass the liquid waste treatment system 15, the radioactivity level of the condensate storage tank 4 is also increased. It is difficult to keep below the limit value. The second recovery processing means is
Since both pool waters are directly discharged to the turbine main condenser hot well 12 without being purified, the radioactivity level of the condensate storage tank 4 is also a limit value, like the first recovery treatment means. It is difficult to keep below.

Furthermore, since the recovery treatment means of FIGS. 3 and 4 both purify both pool water in the liquid waste treatment system 15, the radioactivity level of the condensate storage tank 4 is suppressed to the detection limit value. Since the treatment capacity of the liquid waste treatment system 15 is small, there are drawbacks such as long drainage time.

On the other hand, in a nuclear power plant, reduction of radiation exposure is emphasized, and in particular, suppressing the radioactivity level in the turbine building is a problem.

On the other hand, the water in the condensate storage tank 4 is a water source of makeup water for the turbine condenser, turbine brand steam system, etc. This will reduce the radioactivity level, and since this condensate storage tank 4 is also a water source of make-up water for the reactor building, it is desirable to reduce the radioactivity level in the reactor building.

Therefore, in order to reduce the radioactivity level of the condensate storage tank 4, as described above, it is necessary to treat both pool waters in the liquid waste treatment system 15 and then collect them in the condensate storage tank 4. is there.

Furthermore, in the nuclear power plant, it is important to shorten the periodic inspection time in order to improve the operation efficiency (operation efficiency), and as a result, the drainage time of both pools is reduced. It is necessary to shorten the time, and after the liquid waste treatment system is used, the drainage rate is limited to the treatment rate of the liquid waste treatment system 15 and the drainage time is long. However, it is difficult to shorten this.

The present invention has been made in view of the above circumstances, and shortens the drainage time of the reactor well pool and the equipment temporary storage pool, and at the same time, reduces the radioactivity level of the stored water in the condensate storage tank. It is intended to provide a reactor well water treatment device for the purpose of achieving it.

[Structure of Invention]

(Means for Solving Problems) According to the present invention, pool water in a reactor well pool and a temporary equipment pool is drained and purified by a liquid waste treatment system or the like, and then collected in a condensate storage tank. In the reactor well water treatment device configured to do so, a temporary storage tank for storing the total amount of water in both pools is provided, and the temporary storage tank and both pools are connected by a connecting pipe equipped with a gate valve, and the temporary storage is performed. The tank and the liquid waste treatment system are connected by a connecting pipe equipped with a transfer pump to reduce the radioactivity level of the condensate storage tank and shorten the drainage time.

(Operation) The present invention temporarily stores the total amount of pool water of the reactor well pool and the equipment temporary storage pool in a temporary storage tank, and thereafter supplies this to a liquid waste treatment system by a transfer pump, This is to reduce the level of radioactivity and transfer it to the condensate storage tank for storage.

(Example) The present invention will be described below with reference to an illustrated example.

Note that, in the present invention, the same components as those in the specific example described above are denoted by the same reference numerals and described.

In FIG. 1, reference numeral 1 is a pressure vessel, and a reactor well pool 2 that is substantially integrated with the pressure vessel 1.
The bottom of the equipment temporary storage pool 3 and the condensate storage tank 4 are connected by a weld drain pipe 5.
An opening / closing valve 6, a purified water system pump 7, a super-desalination device 8 and a sluice valve 9 are provided in this order from the upstream side. The well drain pipe 5 on the upstream side of the on-off valve 6 and the condensate water storage tank 4 are connected by a branch pipe 10. The branch pipe 10 has a first gate valve 11 and a turbine condenser hot water. Well
12, a desalting device 13 and a second sluice valve 14 are provided. Furthermore, the bottom of the pressure vessel 1 and the liquid waste treatment system
15 is connected by a connecting pipe 16, and a drain valve 17, an on-off valve 18, a purified water system 19, a super desalination device 20, and a sluice valve 21 are provided in the pipe line of the connecting pipe 16 in this order from the upstream side. Has been.

On the other hand, the condensate storage tank 4 and the liquid waste treatment system 15 are connected by a connecting pipe 23 equipped with an on-off valve 22, and the coolant that has been radioactively treated by the liquid waste treatment system 15 is The condensate storage tank 4 is stored through the connecting pipe 23. A circulation passage 24 is connected between the upper portion and the lower portion of the pressure vessel 1, and the first opening / closing valve 25, the residual heat removal system pump 26 and the second opening / closing valve are connected to the circulation passage 24. 27 are provided. Further, a bypass pipe 29 having a bypass valve 28 is attached between the circulation path 24 on the upstream side of the first opening / closing valve 25 and the connecting pipe 16 on the upstream side of the opening / closing valve 18, and the residual A connection pipe 31 having a gate valve 30 is connected between the discharge side of the heat removal system pump 26 and the liquid waste treatment system 15.

On the other hand, the circulation path 24 on the upstream side of the second on-off valve 27 and the temporary storage tank 32 are connected by a connecting pipe 33 equipped with a gate valve 34. In particular, this temporary storage tank 32 is the reactor well. It is configured to be able to store the total amount of pool water in the pool 2 and the temporary equipment pool 3. Also, the above temporary storage tank
32 and the liquid waste treatment system 15 are connected by a connecting pipe 35, and the connecting pipe 35 is provided with a transfer pump 36 and a gate valve 37.

Therefore, in the present invention, when the pool water of the reactor well pool 2 and the equipment temporary storage pool 3 is drained and recovered in the condensate storage tank 4 after the replacement of the fuel etc., the opening / closing valve 22 and the second opening / closing valve are provided in advance. The valve 27 and the gate valves 34 and 37 are opened, and the transfer pump 36
By driving the pool water in both pools 2 and 3 through the circulation path 24 and the connecting pipe 33, the temporary storage tank 32
Stored in. Then, the pool water stored in the temporary storage tank 32 is supplied to the liquid waste treatment system 15 through the connecting pipe 35, purified by this, and then collected in the condensate storage tank 4 through the connecting pipe 23.

The pool water of both pools 2 and 3 thus activated is temporarily stored in the temporary storage tank 32 and then supplied to the liquid waste treatment system 15, so that even if the treatment capacity is small, it is effective. The above-mentioned treatment can be appropriately performed, and the drainage time of both pools 2 and 3 can be shortened significantly.

Next, another embodiment of the present invention shown in FIG. 2 is that the drain pipe 5 on the upstream side of the gate valve 9 and the temporary storage tank 32 are provided.
And are connected by a connecting pipe 33 equipped with a gate valve 34,
It has the same configuration as the above-described specific example.

On the other hand, in another embodiment of the present invention shown in FIG. 3, the connecting pipe 16 upstream of the gate valve 21 and the temporary storage tank 32 are connected by a connecting pipe 33 having a gate valve 34. And has the same configuration as each of the specific examples described above.

〔The invention's effect〕

As described above, according to the present invention, pool water in the reactor well pool 2 and the temporary equipment pool 3 is drained and purified by the liquid waste treatment system 15, and then collected in the condensate storage tank 4. In the reactor well water treatment device configured as described above, a temporary storage tank 32 for storing the total amount of water in the pools 2 and 3 is provided, and the temporary storage tank 32 and the pool valves 2 and 3 are separated from each other by a partition valve 34.
The temporary storage tank 32 and the liquid waste treatment system 15 are connected by the connecting pipe 35 including the transfer pump 36, so that the wastewater treatment time can be economically shortened. Not only that, even with a small-volume liquid waste treatment system 15, the level of radioactivity can be effectively and appropriately reduced, and since the configuration is simple, it can be incorporated into an existing device.

[Brief description of drawings]

FIG. 1 is a diagram showing a reactor well water treatment apparatus of the present invention, FIGS. 2 and 3 are drawings showing other embodiments of the present invention, and FIG. 4 has already been proposed. It is a diagram showing a reactor well water treatment device. 1 ... Pressure vessel, 2 ... Reactor well pool, 3 ... Temporary equipment pool, 4 ... Condensate storage tank, 12 ... Turbine condenser hot well, 13 ... Over desalination equipment, 15 ... … Liquid waste treatment system, 19 …… Purified water system pump, 20 …… Super desalination device, 32 …… Temporary storage tank, 33 …… Connection pipe, 34 …… Silver valve, 35 …… Connection pipe, 36 …… Transfer pump, 37 ... Gate valve.

Claims (3)

[Claims] 1. The pool water in the reactor well pool and the equipment temporary storage pool is drained and purified by a liquid waste treatment system,
In a reactor well water treatment device designed to collect this in a condensate storage tank, a temporary storage tank for storing the total amount of water in both pools was provided, and a partition valve was provided between this temporary storage tank and both pools. A reactor well water treatment apparatus characterized in that the temporary storage tank and the liquid waste treatment system are connected by a connecting pipe, and the connecting pipe is provided with a transfer pump. 2. An upstream side of a well drain pipe having a gate valve connecting both pools and a condensate storage tank and a temporary storage tank are connected by a connecting pipe having a gate valve. 2. The reactor well water treatment device according to claim 1. 3. The upstream side of a connecting pipe having a sluice valve connecting the pressure vessel and the liquid waste treatment system and the temporary storage tank are connected by a communicating pipe having an on-off valve. Item 1. The reactor well water treatment device according to item 1 or 2.