Method for building radioactive waste disposal structure

FIELD: disposal of radioactive wastes.

SUBSTANCE: proposed method for building radioactive waste disposal structure involves formation of horizontal helical system of round-section transport and room tunnels penetrated by single mechanized tunneling machine including erection of grade-crossing elimination structures. Helical system of tunnels is made in the form of ellipse with variable distance between adjacent tunnels of helical system. Grade-crossing elimination structures are erected at two diametrically opposite points of system where each pair of tunnels is joined to form single tunnel communicating with adjacent coupled tunnel through crossover. Tunnel-to-tunnel distance is predetermined at several points by simulation including heat and radiation load on soil mass.

EFFECT: enhanced radiation safety and reduced construction charges.

1 cl, 2 dwg

 

The invention relates to the construction of underground facilities for storage and disposal of radioactive waste (RW) low and medium activity in shale formations.

Known circuit layout solutions for the Harwell site (F. Trial. Assessment of Underground Disposal of Radioactive Waste Based on Probabilistic Risk Analysis Doe Report DOE/HMIP/RR/92), located 60 km from London, UK. For the disposal of used two layers of clay. The disadvantage of this scheme: low technology and a significant amount of manual work leads to high cost of its construction, low productivity. In this scheme of work is difficult to provide the necessary isolation of the host rocks from exposure to radioactive waste. Production for the storage of radioactive waste are located at a slight distance from each other and form a kind of "reservoir", which increases thermal load on rocks near the "horizon".

Known circuit layout solutions RAO in the area of Mol, Belgium (Report Radioactive Waste Disposal Technical Report Series No. 349/IAEA. Vienna 1993). The depth of the reservoir clays 200-370 m the Disadvantage of this scheme: the efficient use of underground space, due to the large distance between the workings RAO (400 m) and a small cross-section openings RAO (3.5 m)is small. To reduce the heat load on the host rock in this scheme pre-s priority is more of RAO on the surface, that requires spending for temporary storage in the surface or surface area.

Known variant layout solutions for underground storage RAO proposed Sarajevski G.P., Sorokin V.T., Shvedova A.A., Chaweewan CENTURIES, Antinoi L.A., Kulagin NI, S. p. Shchukin, "Underground construction in homogeneous layers of clay rocks for long-term storage and/or disposal of radioactive waste" (patent No. 2133993, the main index of the IPC G 21 F 9/24, registration number of the application 96105726/25). Layout solution is presented in the form of a continuous spiral in the horizontal plane generation, segmented cross-radial distribution and transport tunnels, and these segments can be divided into two parts sealed jumpers. The number of cross-radial tunnels determined on the basis of the amount of waste and production and loading equipment. The coils of the helix features a swivel wheels.

The disadvantage of the prototype is that:

1. You must apply the distributive tunnels for communication camera raw with transport tunnel. It is impossible to carry out the whole complex of workings (except vertical) using one set of equipment without dismantling and installation. The construction of tunnels requires a large amount of ru is tion of labor, that leads to an increase in construction time storage of radioactive waste and impact on its final cost, but also reduces the security of conducting mining operations.

2. Multi-stage construction of underground storage facilities for raw, though, and makes it quicker to enter a part of the store to work, but won time does not compensate for the significant increase in the cost of construction compared to the one-stage scheme of construction.

The technical result of the invention is to remedy these disadvantages: reduced cost of construction and increase the efficiency of construction of underground storage of radioactive waste, radiation safety, a reduction in the specific heat load.

The technical result is achieved in that in the method of creating structures for disposal of radioactive waste, which consists in the formation of horizontal spiral system of transport tunnels and chamber a round cross-section, which are one of the mechanized shield with construction of transport-razvedochnyh nodes, according to the invention the spiral tunnel system are in the form of an ellipse, with a variable distance between adjacent tunnels, transport razvedochnye nodes erected in two diametrically opposite points of the system, where each pair of tunnels connect in one tunnel, tie the config with the neighboring paired tunnel Congress, when this pre-determine the distance between the tunnels at several points by modeling taking into account thermal and radiation load on the ground.

The way to create facilities for the disposal of radioactive waste is illustrated by drawings, where figure 1 shows a scheme of the construction of the plan; figure 2 transport razvedochny node.

The structure contains:

1. Chamber tunnels radioactive waste

2. Transport tunnel

3. Transport razvedochny node

4. The main vertical trunk

5. Ventilation shaft

6. Congress

7. Paired tunnel

The method of creating structures disposal of radioactive waste is carried out as follows. The proposed scheme layout solutions is a spiral, made in the form of an ellipse. Conducting tunnels is mechanized shield diameter 5.63 m, with the subsequent fastening. This scheme allows to implement tunnels one face, one mechanized shield, without delay in the erection and dismantling of construction equipment. This is achieved by connection of the transport tunnel 2 with the chamber tunnels RAO 1. For transportation purposes is to use the closest to the center of the tunnel 2, while the remaining tunnels 1 are used for the storage of radioactive waste. To provide communication between the chamber tons of the members 1 are provided two transport razvedochnyh node 3, constructed in two diametrically opposite points of the system. They are a chamber of large cross section, providing access to the chamber tunnels 1 RAO through vertical trunks 4, 5. In the immediate vicinity of the transport razvedochnogo node 3, a pair of tunnels connects and forms a paired tunnel 7. The transition from one spiral to another is carried out by means of transport congresses 6 installed in the transport razvedochnyh nodes 3. In addition to the communication chamber tunnels 1 RAO with each other and with transport tunnel 2, transport razvedochnye nodes 3 are designed to accommodate staff, workshops, warehouses. Vertical tables 4, 5 can be placed either directly in the transport razvedochnyh nodes, or at a slight distance from the transport razvedochnyh nodes. The choice of distance d1 and d2 between the tunnels to be based on the amount of heat load on the rock mass, the choice of design lining is done on the basis of the ground pressure and heat load on the support and containing an array-based mathematical (numerical) simulation, while d1 and d2 variables and d2>d1

During operation, the storage of radioactive waste radioactive waste containers are delivered from the surface through the main vertical shaft 4, then through the locomotive is on transport, through a series of congresses 6, is delivered to the working part of the store where they were isolated. The space between the containers fill with clay mud. To ensure even heat and radiation loads on the rocks RAO average activity is stored in the Central part of the chamber tunnels RAO between transport razviazanymi nodes 3 with the distance between the tunnels, equal to d2, while RAO low activity come close to traffic-razvedochny nodes with the distance between the tunnels, equal to d1.

Thus, the proposed method will reduce the cost of construction, to improve its facilities and radiation safety, to reduce the heat load on the capacity of the array.

The way to create facilities for the disposal of radioactive waste, which consists in the formation of horizontal spiral system of transport tunnels and chamber a round cross-section, which are one of the mechanized shield with construction of transport-razvedochnyh nodes, characterized in that the spiral tunnel system are in the form of an ellipse with a variable distance between adjacent spiral tunnels system, transport razvedochnye nodes erected in two diametrically opposite points of the system, where each pair of tunnels connect in one tunnel, is provided with adjacent paired tunnel Congress, when this pre-determine the distance between the tunnels at several points by modeling taking into account thermal and radiation load on the ground.



 

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