JPS60213892A - Purifying system of high-radioactive solid waste storage pool - 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] [Field of Application of the Invention] The present invention relates to water purification of a radioactive solid waste storage pool in a nuclear power plant, and in particular uses a combustible filter medium to reduce the volume of waste material and reduce radiation exposure. This invention relates to a purification system for a highly radioactive solid waste storage pool suitable for disposing of waste materials.

[Background of the invention]

A conventional example of the present invention will be explained with reference to the site bunker water purification flow shown in FIG. 1 and the details of the filtration tower shown in FIG.

Highly radioactive fixed waste generated in a nuclear reactor is temporarily stored in a spent fuel pool, and after a certain amount is stored in the pool 1, it is then cut, but in the process, radioactive suspended particles or Radioactive flood pollutes pool water. In order to purify the pool water from contamination, after the pool water is overflowed into the skimmer surge tank 2, the pool water circulation pump 3 is used to filter the porous tubular filtration tower submerged on the side wall of the pool 1. 4 to separate radioactive suspended particles.

The porous tube 6 shown in detail of the filter becomes clogged with filtering substances as the filtration time passes, and eventually becomes unable to pass water. When the filtering tower 4 becomes unavailable, the upper cover 7 is opened, and the perforated pipe is taken out by the overhead crane 5, stored in a solid waste drum, and transported and stored in a storage warehouse.

Disposal of the perforated tube 6 after clogging has disadvantages in that it increases the amount of solid waste and that unless it is kept dry when stored in a drum for solid waste, there is a risk of corrosion damage to the drum. - [Objective of the Invention] The object of the present invention is to - reduce the secondary waste generated from the filtration tower and reduce the exposure of workers to the radioactive solid particles removed by filtration; An object of the present invention is to provide a purification system for a highly radioactive solid waste storage pool suitable for removing sulfur-like particles in an inexpensive facility.

[Summary of the invention]

Activated carbon has the function of water bolizer, adsorption of turbidity particles, filtration function when used as an activated carbon layer, and F e Z++ in pools with low conductivity.

Utilizing the electrochemical oxidation-reduction properties or combustibility of Fe 3+, it can be used to reduce the amount of porous pipe waste generated by conventional equipment, the exposure during handling until storage in drums, and when working under water in pools. We devised a solution to problems such as ensuring transparency by using fluidized activated carbon.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 3 and 4.

During normal filtration operation, polluted water from the highly radioactive solid waste storage pool 1 overflows and is taken into the skimmer surge tank 2. The polluted water taken in is led to an activated carbon-filled filtration tower through a circulation pump 3 and valves 4 and 5, where suspended solids in the polluted water, Fg2+8. Ions such as Fe"" are removed. During normal operation, valves 7 and 8 are closed. on the other hand,
The activated carbon-filled filtration tower 6 is filled with anthracite or crushed coal having a particle size of 0.5 to 51 m111 with a flow path length of about 1000 m+, and the filter tower casing 16 and electrodes 17 are
It is used as an electrode when it is necessary to increase the conductivity of pool water with low conductivity using activated carbon, reduce the distance between the electrodes, and remove turbidity ions. In addition, as the filtration continues, if the activated carbon filtration layer becomes increasingly clogged, the head loss increases, and it becomes impossible to ensure the circulation volume with the circulation pump 3, the filtration is stopped and the activated carbon 15 is automatically discharged. . For automatic unloading, valves 4 and 5 are closed, valves 7 and 8 are opened, and the activated carbon is placed in a water stream and guided to a strainer 9 that separates water and activated carbon.2 The activated carbon after separation is collected in a storage drum 10 and reused. Or transport it to an incinerator and incinerate it to produce a very small amount of radioactive waste ash.

On the other hand, the separated wastewater is led to the waste liquid collection tank 11 of the liquid waste treatment system and treated.

〔Effect of the invention〕

According to the present invention, suspended solids suspended in the pool water (adhered to the solid waste and brought in) when highly radioactive solid waste is brought into the pool and handled in the pool such as cutting. The radiation exposure of workers can be reduced by filtering and adsorbing and removing the cladding and metal ion particles) using electrolytic activated carbon filtration, etc., and automatically transferring the filtered highly radioactive solids to drums. Furthermore, since the activated carbon used as waste filter media can be incinerated in an incinerator, there is a great effect of reducing the volume of final waste.

[Brief explanation of drawings]

Fig. 1 is a purification flow diagram of a conventional highly radioactive solid waste storage pool, Fig. 2 is a structural diagram of a conventionally used porous tubular filter tower, and Fig. 3 is a highly radioactive solid waste storage pool of the present invention. Fig. 4 is a basic structural diagram of an electrolytic activated carbon filtration tower used in the purification system of the present invention. 1...Waste storage pool, 2...Skimmer surge tank, 3...Circulation pump, 4, 5, 7, 8...Filtration process and filter medium extraction switching valve, 6...Electrolytic activated carbon filtration tower , 9・
... Filter media separation strainer, 10... Solid waste storage drum, 13... Filtration/filter media extraction piping, 14... Filtrate inlet nozzle 3 days

Claims (1)

[Claims] 1. A skimmer surge tank that takes in the waste storage pool water contaminated with radioactive suspended particles, a circulation pump that passes the banker pool water through a filter and returns purified water to the pool. An activated carbon filter that filters suspended particles, and activated carbon in the filter. In a closed-loop system consisting of an activated carbon recovery device for removal and disposal, and piping and valves that serve as the flow path for these, only the waste materials can be automatically removed while the filter is submerged in pool water, reducing radiation exposure by workers. This highly radioactive solid waste storage boot blow purification system is designed to reduce radiation exposure and is characterized by a filter that uses an incinerator and does not contain solid waste that cannot be incinerated.