JPH0344600A - Transferring equipment of spent resin - Google Patents

Abstract

PURPOSE:To improve an operation efficiency of a radioactive waste disposal system by a method wherein a waste liquid of low conductivity from a low conductivity waste liquid collecting tank is make to flow as washing water into a resin transfer piping including an outlet valve and thereby the resin transfer piping and an outlet valve element are washed. CONSTITUTION:When a liquid level in a spent resin receiver tank 1 reaches a prescribed value, a liquid level detector detects this. With an outlet valve 2 opened on the basis of detection, a transfer pump 4 is operated to transfer spent resin 7 in the spent resin receiver tank 1, together with transfer water, to a storage tank, The completion of transfer is judged by detection of a low-low liquid level by the liquid level detector, the outlet valve 2 is closed and the transfer pump 4 is stopped. Simultaneously with this completion of transfer, a waste liquid 13 of low condwetivity in a low-conductivity waste liquid collecting tank 10 is supplied as washing water a resin transfer piping 3 and the transfer pump 4 is operated again to wash the inside of the piping. The waste liquid 13 of low conductivity is separated from the spent resin 7 in the storage tank and collected as supernatant water in the collecting tank 10 so as to be reused. Accordingly, no fresh supply water is needed for washing and thus a capacity of disposal of the whole of a radioactive waste disposal system can be lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention 1 (Industrial Application Field) The present invention relates to a used resin transfer device for transferring used resin generated from a nuclear power plant or the like to a solidification facility or the like.

(Prior Art) In nuclear power plants, it is necessary to constantly purify the reactor coolant, condensate after driving the turbine, fuel pool, etc., so ion exchange resins and the like are used as purification materials.

When the purification ability of these purification materials, such as ion exchange ability, decreases, they are stored as used resin in the storage tank of radioactive waste treatment equipment for a certain period of time, and after the radiation level has attenuated, they are transferred to solidification equipment and solidified. Processing is in progress.

Conventionally, as shown in the block diagram of a used resin transfer device in FIG. 2, a resin transfer pipe 3 is connected to the lower part of a used resin receiving tank 1 via an outlet valve 2. It communicates with a storage tank or a solidification device via a transfer pump 4. Further, the resin transfer pipe 3 is connected to a wash water pipe 6 via a wash water valve 5 to a relatively high-purity make-up water system in the nuclear power plant.

The reactor coolant and the spent resin 7 of the condensate purification system generated during the operation of the nuclear power plant flow into the spent resin receiving tank 1 together with the transfer water. When the liquid level of this used resin 7 reaches a predetermined value in the used resin receiving tank 1, this is detected by a liquid level detector (not shown), the outlet valve 2 is opened, and the transfer pump 4 is operated. and then transferred to the storage tank. After the used resin 7 is transferred, the washing water valve 5 is used to wash away the used resin 7 remaining in the resin transfer pipe 3 and to prevent it from getting caught in the outlet valve 2.
Open and flush the make-up water from the water pipe 6 to the taste a#f! The inside of the resin transfer piping 3 is cleaned by flowing into the resin transfer pipe 3.

(Problems to be Solved by the Invention) The spent resin 7 remaining in the resin transfer pipe 3 after the spent resin 7 has been transferred naturally has a high radiation level, and the make-up water after being used as washing water is It becomes necessary to purify the waste liquid generated by leakage from various parts of the nuclear power plant (not shown) using a treatment system for low conductivity waste liquid. That is, by carrying out the work of transferring the used resin 7, makeup water becomes waste liquid and the amount of secondary waste generated increases, which causes the problem that the treatment efficiency of the entire radioactive waste treatment system (not shown) decreases. .

The present invention has been made in view of the above, and its purpose is to suppress the generation of secondary waste by using low-conductivity waste liquid in pipe cleaning water after used resin transfer. The purpose of the present invention is to provide a transfer device.

[Structure of the Invention] (Means for Solving the Problems) A used resin receiving tank for used resin flowing in together with transfer water, a resin transfer pipe connected to the used resin receiving tank via an outlet valve, A transfer pump connected to this resin transfer pipe and a communication pipe via a communication valve, a collection pump connected to this communication pipe and communicated with a low conductivity waste liquid collection tank, and a collection pump outlet connected to a low conductivity waste liquid treatment system. Equipped with a valve.

(Function) After the used resin is transferred to the storage tank or solidification equipment, the low conductivity waste liquid from the low conductivity waste liquid collection tank is flowed as washing water into the resin transfer pipe including the outlet valve. and clean the outlet valve.

(Example) An embodiment of the present invention will be described with reference to the drawings.

Note that the h'i components that are the same as those in the prior art described above are given the same reference numerals and detailed explanations will be omitted.

FIG. 1 is a configuration diagram, in which a resin transfer pipe 3 is connected via an outlet valve 2 to the lower part of a used resin receiving tank 1 that temporarily stores incoming used resin 7 together with transferred water. The transfer pipe 3 communicates with the storage tank via a transfer pump 4. Further, the resin transfer pipe 3 includes a communication pipe 9 via a communication valve 8, and a collection pump 11 connected to the low conductivity waste liquid collection tank IO connected to the communication pipe 9. and a collection pump outlet valve 12 connected to a low conductivity waste liquid treatment system, which is a variety of waste liquid treatment devices. Note that the low conductivity waste liquid 13 is collected from leakage water generated in various parts of the nuclear power plant, and is stored in the low conductivity liquid waste collection tank IO after removing solid matter and the like.

Next, the effect of the above configuration will be explained. It is assumed that each of the above-mentioned valves is initially closed and each pump is also stopped. Reactor coolant and used resin 7 from the condensate purification system from various locations in the nuclear power plant flow down into the spent resin receiving tank 1 together with transfer water. When the liquid level in the used resin receiving tank 1 reaches a predetermined value, a liquid level detector (not shown) detects this and opens the outlet valve 2, and the transfer pump 4
is operated to transfer the used resin 7 in the used resin receiving tank 1 to the storage tank together with transfer water via the resin transfer pipe 3. Completion of the transfer of the used resin 7 is determined by the low or low liquid level detected by the liquid level detector, the outlet valve 2 is closed, and the transfer pump 4 is stopped.

At the same time as this transfer is completed, the first collection pump is operated, and the communication valve 8 is operated.
Open the low conductivity waste liquid collection tank I via the connecting pipe 9.
Resin transfer pipe 3 uses low conductivity waste liquid 13 in O as cleaning water
The transfer pump 4 is operated again to clean the inside of the piping up to the storage tank, including the outlet valve 2. The low conductivity waste liquid 13 used as the washing water is separated from the used resin 7 in the destination storage tank, and is collected again as supernatant water in the low conductivity waste liquid collection tank 10 to be used in the low conductivity treatment system. sent to be processed. As a result, new make-up water is not required for cleaning the resin transfer pipe 3 including the outlet valve 2, and therefore no secondary waste is generated, making it possible to reduce the processing capacity of the entire radioactive waste treatment system. can.

[Effects of the Invention] As described above, according to the present invention, no new make-up water is required for pipe cleaning after used resin transfer, so no secondary waste is generated, and the processing capacity of the entire radioactive waste treatment system is reduced. Because it is small, it has the effect of improving the operational efficiency of radioactive waste treatment systems.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional used resin transfer device. 1... Used resin receiving tank, 2... Outlet valve, 3
...resin transfer piping, 4...transfer pump,
7... Used resin, 8... Connection valve, 9...
...Connection piping, lO...Low conductivity waste liquid collection tank, 11...Collection pump, 12...Collection pump outlet valve, 13...Low conductivity waste liquid.

Claims (1)

[Claims] The used resin flowing in together with the transferred water is transferred to a used resin receiving tank, a resin transfer pipe connected to this used resin receiving tank via an outlet valve, and a transfer pump and communication valve connected to this resin transfer pipe. A used resin transfer device comprising: a connecting pipe connected to the connecting pipe, a collection pump connected to the connecting pipe and communicating with a low conductivity waste liquid collection tank, and a collection pump outlet valve connected to a low conductivity treatment system.