阅读说明：本技术 一种热室拆除工艺 (Hot chamber dismantling process ) 是由 滕磊 张永领 隆涛 王帅 彭婧 丁然 夏霜霜 刘剑 刘晓琼 李正斌 于 2019-10-22 设计创作，主要内容包括：本发明公开了一种热室拆除工艺,先拆除不锈钢覆面再拆除重混凝土,包括以下步骤：1)、确定不锈钢覆面背部支架及加强筋的位置,并进行标记；2)、按照标记出来的区域,选择没有背部支架及加强筋的位置,使用角磨机先切割拆除没有背部支架及加强筋的位置,再沿背部支架及加强筋的齐根处,进行切割拆除剩余不锈钢覆面；3)、规划、标识重混凝土的切割路径,并使用钻孔机钻孔获得穿墙通孔；4)、按照标识的切割路径,使用金刚石绳锯系统切割拆除重混凝土。所述拆除工艺实现对退役热室的高效拆除,解决了强放热室退役不锈钢-重混凝土结构拆除的难题。(The invention discloses a hot chamber dismantling process, which comprises the following steps of dismantling a stainless steel clad surface and then dismantling heavy concrete: 1) determining the positions of the stainless steel cladding back support and the reinforcing ribs, and marking; 2) selecting the position without the back support and the reinforcing ribs according to the marked area, cutting and removing the position without the back support and the reinforcing ribs by using an angle grinder, and cutting and removing the residual stainless steel clad surfaces along the root-aligning positions of the back support and the reinforcing ribs; 3) planning and marking a cutting path of the heavy concrete, and drilling by using a drilling machine to obtain a through-wall through hole; 4) and cutting and removing the heavy concrete by using a diamond wire saw system according to the cutting path of the mark. The demolition process realizes efficient demolition of the decommissioned hot chamber, and solves the problem of demolition of the decommissioned stainless steel-heavy concrete structure of the strong heat release chamber.)

1. A hot cell demolition process, characterized in that the demolition of the stainless steel cladding before the demolition of the heavy concrete (2), comprises the following steps:

1) determining the positions of the stainless steel cladding back support (3) and the reinforcing ribs, and marking;

2) selecting the position without the back support (3) and the reinforcing ribs according to the marked area, cutting and removing the position without the back support (3) and the reinforcing ribs by using an angle grinder, and cutting and removing the residual stainless steel clad surfaces along the root-sharing positions of the back support (3) and the reinforcing ribs;

3) planning and marking a cutting path of the heavy concrete (2), and drilling by using a drilling machine to obtain a through-wall through hole (8);

4) and cutting and removing the heavy concrete (2) by using a diamond wire saw system according to the marked cutting path (9).

2. A hot-chamber demolition process according to claim 1, characterized in that the stainless steel cladding is demolished and the surface of the heavy concrete (2) is inspected for general contamination and, if contamination is present, decontaminated and then the heavy concrete (2) is demolished.

3. A hot cell demolition process according to claim 1, wherein the stainless steel cladding demolition comprises in particular the steps of:

a1) determining the positions of the stainless steel cladding back support (3) and the reinforcing ribs, and marking for the first time;

b1) determining an area without the back support (3) and the reinforcing ribs according to the primary marks, and secondarily marking a wall through hole (6) and a radiation hot spot in the area, wherein the wall through hole (6) and the radiation hot spot adopt different marks;

c1) removing the radiation hot spot area and the wall-through hole channel (6) area according to the secondary mark;

d1) cutting according to the primary mark, and removing the area without the back support (3) and the reinforcing ribs on the back;

e1) and cutting and removing the rest area along the back support (3) and the root-trimming part of the reinforcing rib.

4. A hot cell demolition process according to claim 1, characterized in that the heavy concrete (2) demolition comprises wall demolition and foundation demolition when the heavy concrete (2) is contaminated and the soil removal effect of the foundation is insignificant.

5. A hot cell demolition process according to claim 4, wherein the wall demolition particularly comprises the steps of:

a2) drilling a wall through hole (8) on the wall by using a drilling machine according to the marked cutting path (9);

b2) selecting two wall through holes in the upper part of the wall body, and installing a slurry protection device;

c2) a diamond wire saw rope penetrates through one of the wall through holes and then penetrates out of the other wall through hole in a one-in one-out mode;

d2) and according to the marked cutting path (9), starting the diamond wire saw system, and cutting and dismantling the wall body of the heavy concrete (2).

6. A hot chamber demolition process according to claim 4, characterized in that the said demolition of the foundations comprises in particular the following steps:

a3) marking a polluted area according to the pollution measurement result, and connecting the boundaries (11) of the polluted area in a straight line;

b3) drilling vertical holes (12) at four corners of the boundary (11) of the polluted area by using a drilling machine, wherein the depth of each vertical hole (12) is equivalent to that of the foundation;

c3) measuring the distance from the polluted area boundary (11) to the foundation boundary (13), connecting one polluted area boundary (11) to the lowest point of the side surface of the foundation boundary (13), and identifying;

d3) drilling a horizontal through hole (15) at the mark point of the foundation boundary (13) by using a drilling machine, wherein the depth of the horizontal through hole (15) is equivalent to the distance from the boundary (11) of the polluted area to the foundation boundary (13);

e3) a diamond wire saw rope is threaded in from the horizontal through hole (15) and threaded out from the vertical hole (12) in a one-in one-out mode;

f3) starting the diamond wire saw system to cut;

g3) repeating the steps c3) -f3) to cut the other two boundaries of the polluted area;

h3) and sleeving a diamond rope saw rope at the position of any pollution area boundary (11) to be flush with the root, and cutting and dismantling the whole polluted heavy concrete foundation.

Technical Field

The invention relates to the technical field of nuclear facility decommissioning treatment, in particular to a hot chamber dismantling process.

Background

The strong and heat release chamber is generally used as a supporting facility for irradiation inspection of reactor materials, and is mainly used for irradiation inspection and determination of various thermal properties of various novel fuel elements and reactor materials, disassembly and cutting processing of test element components and various irradiation devices, subpackaging of high-strength isotopes and the like. In general, based on radiation protection consideration, the strong heat release chamber adopts a structure combining heavy concrete and a stainless steel clad liner, so that effective shielding can be ensured, and radioactive contamination nuclides can be prevented from permeating into a heavy concrete wall to cause pollution diffusion.

As the reactor completes its operational tasks satisfactorily, the hot cell will also face decommissioning as a complete facility. As a radioactive research workplace, the decommissioning difficulty of a hot room is very high and mainly appears as follows: (1) the radiation level of the hot chamber is high, the pollution is serious, and the nuclide composition is complex; (2) the secondary heating chamber has a complex structure, and heavy concrete has high specific gravity and high thickness; (3) the arrangement of the items in the hot room is compact, and the number of equipment bases, pits and supports is large.

Disclosure of Invention

The invention aims to provide a hot chamber dismantling process, which realizes efficient dismantling of a retired hot chamber.

The invention is realized by the following technical scheme:

a hot chamber demolition process, which demolishes stainless steel cladding and then heavy concrete, comprises the following steps:

1) determining the positions of the stainless steel cladding back support and the reinforcing ribs, and marking;

2) selecting the position without the back support and the reinforcing ribs according to the marked area, cutting and removing the position without the back support and the reinforcing ribs by using an angle grinder, and cutting and removing the residual stainless steel clad surfaces along the root-aligning positions of the back support and the reinforcing ribs;

3) planning and marking a cutting path of the heavy concrete, and drilling by using a drilling machine to obtain a through-wall through hole;

4) and cutting and removing the heavy concrete by using a diamond wire saw system according to the cutting path of the mark.

The angle grinder and the diamond wire saw system are both in the prior art.

Because the stainless steel clad surface is welded on the back support, the back support is pre-buried in the heavy concrete, a certain gap is formed between the stainless steel clad surface and the heavy concrete, and the stainless steel clad surface and the heavy concrete are made of different materials, the applicant detaches the stainless steel clad surface of the hot chamber from the heavy concrete according to the characteristics, and the stainless steel clad surface is arranged inside, so that the stainless steel clad surface is firstly detached and then the heavy concrete is detached, and the detaching efficiency is improved.

The concrete dismantling process of the stainless steel cladding and the heavy concrete is designed according to actual hot spots of the stainless steel cladding and the heavy concrete. The stainless steel cladding and the heavy concrete are removed better and more efficiently.

The conception of the invention is as follows: aiming at the structural characteristics, the pollution condition and other factors of the hot chamber, the possible difficulties in the decommissioning process are considered, and on the basis of serious consideration and experimental research, the efficient dismantling process of the stainless steel-heavy concrete structure of the hot chamber is designed, so that a solution is provided for the decommissioning implementation of the strong heat release chamber.

In conclusion, the invention realizes the efficient dismantling of the stainless steel cladding and the heavy concrete, and solves the difficult problem of dismantling the retired stainless steel-heavy concrete structure of the intensive heat release chamber.

Further, after the stainless steel cladding is removed, the surface of the heavy concrete is generally checked for pollution, and if the surface of the heavy concrete is polluted, the heavy concrete is removed after decontamination treatment.

Before the hot chamber is dismantled, decontamination treatment needs to be carried out on the hot chamber to remove radioactive pollution, and the decontamination treatment is carried out on a stainless steel cladding surface in the hot chamber to directly treat heavy concrete.

The operation of generally investigating the surface of the heavy concrete avoids the radioactive pollution diffusion caused by the dismantling of the heavy concrete, reduces the generation amount of radioactive wastes, reduces the decommissioning cost, protects the safety of workers and the environment, and has remarkable economic and social benefits.

Further, the stainless steel clad surface dismantling method specifically comprises the following steps:

a1) determining the positions of the stainless steel cladding back support and the reinforcing ribs, and marking for the first time;

b1) determining an area without a back support and reinforcing ribs according to the primary mark, and secondarily marking a wall-through hole channel and a radiation hot spot in the area, wherein the wall-through hole channel and the radiation hot spot adopt different marks;

c1) removing the radiation hot spot area and the wall-through hole channel area according to the secondary mark;

d1) cutting according to the primary mark, and removing the area without the back support and the reinforcing ribs on the back;

e1) and cutting and removing the residual area along the butt part of the back support and the reinforcing rib.

By adopting the scheme, the stainless steel clad surface can be rapidly dismantled, the radioactive cross contamination caused in the dismantling process is avoided, and the practice of minimizing the radioactive wastes is realized.

Further, the heavy concrete dismantling comprises wall dismantling, and when the heavy concrete is polluted and the soil removal effect of the foundation is not obvious, the foundation dismantling is also included.

Further, the wall dismantling method specifically comprises the following steps:

a2) drilling a through-wall hole on the wall by using a drilling machine according to the marked cutting path;

b2) selecting two wall through holes in the upper part of the wall body, and installing a slurry protection device;

c2) a diamond wire saw rope penetrates through one of the wall through holes and then penetrates out of the other wall through hole in a one-in one-out mode;

d2) and according to the cutting path of the mark, starting the diamond wire saw system, and cutting and dismantling the wall body of the heavy concrete.

The through-wall holes are a general term for a group of through-wall holes, and the through-wall holes described later are all selected from the group of through-wall holes according to actual working requirements.

The proposal adopts a conclusion obtained by a large number of experiments of the diamond wire saw system, adopts a cutting path from top to bottom and from left to right, can effectively collect slurry generated in the cutting process, avoids pollution diffusion, can obviously improve the cutting and dismantling efficiency, and has obvious process advantages.

Further, the foundation demolition specifically comprises the following steps:

a3) marking a pollution area according to a pollution measurement result, and connecting the boundaries of the pollution area in a straight line;

b3) drilling vertical holes at four corners of the boundary of the polluted area by using a drilling machine, wherein the depth of each vertical hole is equivalent to that of the foundation;

c3) measuring the distance from the boundary of the polluted area to the boundary of the foundation, connecting one of the boundaries of the polluted area to the lowest point of the side surface of the boundary of the foundation, and identifying;

d3) drilling a horizontal through hole at the foundation boundary identification point by using a drilling machine, wherein the depth of the horizontal through hole is equivalent to the distance from the boundary of the polluted area to the foundation boundary;

e3) a diamond wire saw rope is threaded in from the horizontal through hole and threaded out from the vertical hole in a one-in one-out mode;

f3) starting the diamond wire saw system to cut;

g3) repeating the steps c3) -f3) to cut the other two boundaries of the polluted area;

h3) and sleeving a diamond rope saw rope at the position of the boundary of any polluted area, and cutting and dismantling the whole polluted heavy concrete foundation.

By adopting the scheme, the technical problem of cutting and dismantling of the heavy concrete foundation is solved, and meanwhile, compared with the traditional drilling machine adopting an emptying method for cutting and dismantling, the efficiency is remarkably improved by nearly 10 times, and the technical advantage is obvious.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the invention realizes the efficient dismantling of the stainless steel cladding and the heavy concrete, and solves the difficult problem of dismantling the retired stainless steel-heavy concrete structure of the intensive heat release chamber.

2. The operation of the invention for generally investigating the surface of the heavy concrete avoids the radioactive pollution diffusion caused by the dismantling of the heavy concrete, reduces the generation amount of radioactive wastes, reduces the decommissioning cost, protects the safety of workers and the environment, and has remarkable economic and social benefits.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic top view of a typical hot cell configuration;

FIG. 2 is an enlarged schematic view of a stainless steel-heavy concrete structure;

FIG. 3 is a schematic view of a heavy concrete wall cut;

fig. 4 is a schematic diagram of cutting a heavy concrete foundation.

Reference numbers and corresponding part names in the drawings:

1-shielding porch, 2-heavy concrete, 3-back support, 4-wall surface stainless steel cladding, 5-ground surface stainless steel cladding, 6-wall through hole channel, 7-peep window, 8-wall through hole, 9-cutting path, 10-foundation depression surface, 11-pollution area boundary, 12-vertical hole, 13-foundation boundary, 14-foundation side viewing structure and 15-horizontal through hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.