阅读说明：本技术 一种核电站内具有碎片收集功能的围堰装置 (Cofferdam device with fragment collection function in nuclear power station ) 是由 刘汉臣 武心壮 夏栓 郭丹丹 向文娟 吴辉平 刘洁 刘冰 黄镜宇 李东祚 于 2021-10-19 设计创作，主要内容包括：本发明公开了一种核电站内具有碎片收集功能的围堰装置,涉及核电站安全系统技术领域,包括：上部围板、固定孔和围堰框架,所述围堰框架的顶端固定连接有上部围板,所述围堰框架的底端均匀固定连接有孔间隔架,且相邻孔间隔架之间均匀固定连接有流动通道,所述围堰框架底部的两侧与一端皆均匀设置有固定孔,所述上部围板一端的顶部均匀固定连接有围板支架,且围板支架的一端均与流动通道顶部的一端固定连接。本发明通过在围堰框架的顶端固定连接有上部围板,上部围板为实体结构,在上部围板的作用下,使来流产生竖直方向的流动,使位于安全壳底部的碎片受到水流的压制,不会翻越围堰框架,避免碎片进入滤网和地坑。(The invention discloses a cofferdam device with a debris collecting function in a nuclear power station, which relates to the technical field of nuclear power station safety systems and comprises the following components: the cofferdam comprises an upper portion coaming, fixing holes and a cofferdam frame, wherein the upper portion coaming is fixedly connected to the top end of the cofferdam frame, the bottom end of the cofferdam frame is uniformly and fixedly connected with hole spacing frames, flow channels are uniformly and fixedly connected between the adjacent hole spacing frames, the fixing holes are uniformly formed in the two sides and one end of the bottom of the cofferdam frame, a coaming support is uniformly and fixedly connected to the top of one end of the upper portion coaming, and one end of the coaming support is fixedly connected with one end of the top of the flow channel. According to the cofferdam, the upper enclosing plate is fixedly connected to the top end of the cofferdam frame, the upper enclosing plate is of a solid structure, incoming flow is enabled to flow in the vertical direction under the action of the upper enclosing plate, fragments located at the bottom of the containment vessel are pressed by water flow, the fragments cannot climb over the cofferdam frame, and the fragments are prevented from entering the filter screen and the pit.)

1. A cofferdam device with a debris collecting function in a nuclear power station is characterized by comprising: the cofferdam comprises an upper portion coaming (1), fixing holes (5) and a cofferdam frame (6), wherein the upper portion coaming (1) is fixedly connected to the top end of the cofferdam frame (6), the hole spacing frames (2) are uniformly and fixedly connected to the bottom end of the cofferdam frame (6), flow channels (3) are uniformly and fixedly connected between the adjacent hole spacing frames (2), the fixing holes (5) are uniformly formed in the two sides of the bottom of the cofferdam frame (6) and one end of the bottom of the cofferdam frame (6), a coaming support (8) is uniformly and fixedly connected to the top of one end of the upper portion coaming (1), and one end of the coaming support (8) is fixedly connected to the top of the flow channels (3).

2. Cofferdam apparatus with debris collecting function in nuclear power plants according to claim 1, characterized in that said upper enclosing plate (1) is of solid structure.

3. Cofferdam device with debris collecting function in nuclear power plant according to claim 1 characterized in that said flow channel (3) is internally provided with a channel screen (7) and said flow channel (3) is uniformly provided with filtering holes (4) at one, both and top ends.

4. Cofferdam device with debris collection function in nuclear power plant according to any of the claims 3 characterized in that said filtering holes (4) are designed with equal spacing on the flow channel (3), said filtering holes (4) being circular holes with diameter of 1.6 mm.

5. Cofferdam device with debris collection function in nuclear power plants according to claim 1, characterized by the fact that the side view of the upper coaming (1) and hole spacer (2) is of L-shaped design, supporting the flow channel (3).

6. Cofferdam device with debris collecting function in nuclear power plants according to claim 1, characterized in that said flow channel (3) is of trapezoidal design, said flow channel (3) widening in the water flow direction.

7. Cofferdam device with debris collecting function in nuclear power plants according to claim 1, characterized in that the bottom end of said flow channel (3) is provided with filtering holes (4).

8. Cofferdam device with debris collecting function in nuclear power plant according to claim 1 characterized in that said fixing holes (5) are of equidistant design and the fixing holes (5) are symmetrically arranged with respect to the vertical centre line of the cofferdam frame (6).

9. Cofferdam device with debris collecting function in nuclear power plant according to claim 1, characterized in that said coaming support (8) supports the flow channel (3), and that the cofferdam frame (6), the coaming support (8) and the flow channel (3) are of triangular design.

Technical Field

The invention relates to the technical field of nuclear power station safety systems, in particular to a cofferdam device with a debris collection function in a nuclear power station.

Background

The pressurized water reactor is the most extensive nuclear power plant reactor type in the world at present, after a loss coolant accident (LOCA) and a main steam pipeline rupture (MSLB) accident occur, a large amount of high-temperature and high-pressure gas is injected into a containment vessel due to rupture of a high-energy pipeline, a large amount of fragments are possibly generated due to impact of the high-pressure gas on various devices and materials in the containment vessel, the fragments can block a reactor core in a passive reactor core cooling system in the containment vessel, the flow resistance of the coolant is increased, the heat discharge capacity of the reactor core is reduced, the overheating of the reactor and the leakage risk of radioactive substances are increased, and in order to reduce the amount of the fragments entering the reactor core and a filter screen under the accident condition, a cofferdam steel for blocking the fragment materials is arranged in front of a pit filter screen of the nuclear power plant;

experimental study discovers, because current steel cofferdam is at the in-process that blocks the piece material, rivers can cross the steel cofferdam and get into the containment pit, along with the increase of velocity of water flow, the piece material receives the impact of smuggleing secretly of rivers, the piece can cross the cofferdam along with rivers and get into filter screen and pit, make blocking function failure of cofferdam, under this situation, just need design one kind and can satisfy the piece and block the requirement, can carry out the cofferdam device of collecting to the piece simultaneously, can promote equipment's security greatly.

Disclosure of Invention

The invention aims to provide a cofferdam device with a debris collecting function in a nuclear power station, which aims to solve the problems that the velocity of water flow is increased, debris materials are carried and impacted by the water flow, and debris can enter a filter screen and a pit along with the water flow when the debris materials turn over a cofferdam, so that the blocking function of the cofferdam is invalid.

In order to achieve the purpose, the invention provides the following technical scheme:

a cofferdam device with a debris collecting function in a nuclear power station includes: the cofferdam comprises an upper portion coaming, fixing holes and a cofferdam frame, wherein the upper portion coaming is fixedly connected to the top end of the cofferdam frame, the bottom end of the cofferdam frame is uniformly and fixedly connected with hole spacing frames, flow channels are uniformly and fixedly connected between the adjacent hole spacing frames, the fixing holes are uniformly formed in the two sides and one end of the bottom of the cofferdam frame, a coaming support is uniformly and fixedly connected to the top of one end of the upper portion coaming, and one end of the coaming support is fixedly connected with one end of the top of the flow channel.

Preferably, the upper enclosing plate is of a solid structure.

Preferably, the inside of flow channel all is provided with the passageway filter screen, flow channel's one end, both sides and top all evenly are provided with the filtration pore.

Preferably, the filtering holes are designed on the flow channel at equal intervals, and the filtering holes are round holes with the diameter of 1.6 mm.

Preferably, the side view of the upper enclosing plate and the hole spacing frame is in an L-shaped design, and the flow channel is supported.

Preferably, the flow channel is of trapezoidal design, the flow channel widening in the direction of the water flow.

Preferably, the bottom end of the flow channel is provided with a filtering hole.

Preferably, the fixing holes are designed at equal intervals, and the fixing holes are symmetrically arranged about the vertical center line of the cofferdam frame.

Preferably, the surrounding plate support supports the flow channel, and the cofferdam frame, the surrounding plate support and the flow channel are designed in a triangular shape.

Compared with the prior art, the invention has the beneficial effects that:

1. the flow channels are uniformly arranged at the lower part of the cofferdam frame and are in a trapezoidal design, the design utilizes the fluid mechanics principle, and is obtained by an analysis method combining numerical analysis and experimental research, a channel filter screen is arranged in each flow channel, the diameter of each filter hole is 1.6mm, water flows out through the filter holes, but fragments in water flow are retained in the flow channels under the filtration of the channel filter screen, the fragments are collected through the flow channels, the fragments can block a reactor core in a passive reactor core cooling system in a containment, the flow resistance of the coolant is increased, the heat discharge capacity of the reactor core is reduced, the risk of overheating of the reactor and leakage of radioactive substances is increased, serious safety accidents are caused, and the fragments can be effectively removed to reduce the occurrence rate of safety accidents;

2. through the top fixedly connected with upper portion bounding wall at cofferdam frame, upper portion bounding wall is the entity structure, under the effect of upper portion bounding wall, makes the incoming flow produce the flow of vertical direction, makes the piece that is located the containment bottom receive the suppression of rivers, can not climb over cofferdam frame, avoids the piece to get into filter screen and pit.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic top view of the present invention;

FIG. 3 is a rear view of the present invention;

FIG. 4 is a left side view of the present invention.

In the figure: 1. an upper coaming; 2. a hole spacer; 3. a flow channel; 4. a filtration pore; 5. a fixing hole; 6. a cofferdam frame; 7. a channel filter screen; 8. and a coaming support.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: a cofferdam device with a debris collecting function in a nuclear power station includes: the cofferdam comprises an upper enclosing plate 1, a fixing hole 5 and a cofferdam frame 6, wherein the top end of the cofferdam frame 6 is fixedly connected with the upper enclosing plate 1, the upper enclosing plate 1 is of a solid structure, the incoming flow direction can be changed, a part of incoming flow flows downwards, a vertical downward acting force is given to bottom fragments, and the possibility that the fragments cross the cofferdam is reduced;

the side view of the upper enclosing plate 1 and the hole spacing frame 2 is in an L-shaped design, and supports the flow channel 3; (ii) a

The bottom end of the cofferdam frame 6 is uniformly and fixedly connected with the hole spacing frames 2, the flow channels 3 are uniformly and fixedly connected between the adjacent hole spacing frames 2, the flow channels 3 are in a trapezoidal design, the flow channels 3 are widened along the water flow direction, and fragments can be retained in the flow channels 3 after entering the flow channels 3;

the inside of the flow channel 3 is provided with a channel filter screen 7, one end, two sides and the top end of the flow channel 3 are uniformly provided with filter holes 4, water flows flow out through the filter holes 4, and the bottom end of the flow channel 3 is provided with the filter holes 4, so that on one hand, the structural strength of the cofferdam frame 6 is increased, on the other hand, the water flow speed at the inlet position of the flow channel 3 is increased, and fragments can smoothly enter the flow channel 3;

the filter holes 4 are designed on the flow channel 3 at equal intervals, the filter holes 4 are round holes with the diameter of 1.6mm, fragments can be retained in the flow channel 3 while water can smoothly pass through the filter holes under the aperture, the flow channel 3 is designed in a trapezoid shape, the design utilizes the fluid mechanics principle and is obtained by an analysis method combining numerical analysis and experimental study, a channel filter screen 7 is arranged in the flow channel 3, the diameter of the filter holes 4 is 1.6mm, water flows out through the filter holes 4, but the fragments in the water flow are retained in the flow channel 3 under the filtration of the channel filter screen 7, the fragments are collected through the flow channel 3, meanwhile, the upper enclosing plate 1 above the flow channel 3 is of a solid structure, incoming flow in the vertical direction is generated under the action of the upper enclosing plate 1, the fragments positioned at the bottom of the containment vessel are pressed by the water flow, and cannot climb over the cofferdam frame 6, the fragments are prevented from entering a filter screen and a pit;

fixing holes 5 are uniformly formed in two sides and one end of the bottom of the cofferdam frame 6, the fixing holes 5 are designed at equal intervals, the fixing holes 5 are symmetrically arranged about the vertical center line of the cofferdam frame 6, so that the fixing is more stable, the cofferdam frame 6 is arranged in front of a pit and a filter screen in a containment, and the cofferdam frame 6 is fixed through the fixing holes 5 by bolts;

the even fixedly connected with bounding wall support 8 in top of 1 one end of upper portion bounding wall, and the one end of bounding wall support 8 all with the one end fixed connection at 3 tops of flow channel, bounding wall support 8 supports flow channel 3, cofferdam frame 6, be the triangle-shaped design between bounding wall support 8 and the flow channel 3, support and fix upper portion bounding wall 1, the recirculated water flow carries the piece to flow to cofferdam frame 6, the rivers meet stopping of upper portion bounding wall 1, change the incoming flow direction, make partly incoming flow downward flow, a vertical decurrent power of water flow bottom piece, reduce the piece and cross the possibility of cofferdam, the piece of rivers lower part is along with rivers entering flow channel 3's inside, rivers flow into the pit through the space of filtration pore 4, the piece is filtered by passageway filter screen 7 and is stayed in flow channel 3, filter and collect the piece.

The working principle is as follows: firstly, arranging a cofferdam frame 6 in front of a pit and a filter screen in a containment, fixing the cofferdam frame 6 through a fixing hole 5 by using bolts, if an accident occurs in the nuclear power station, starting a safety injection system to inject water into a reactor core and the pit, then, starting the circulation, submerging a cofferdam device by the water, and enabling fragments falling off from the containment to flow to the cofferdam frame 6 along with the circulation water flow;

secondly, the recycled water flow carries fragments to flow to the cofferdam frame 6, the water flow meets the blocking of the upper enclosing plate 1, the incoming flow direction is changed, a part of incoming flow flows downwards, the fragments at the bottom of the water flow have a vertical downward force, the possibility that the fragments cross the cofferdam is reduced, the fragments at the lower part of the water flow enter the flow channel 3 along with the water flow, the water flow flows out into a pit through the gap of the filtering hole 4, the fragments are filtered by the channel filter screen 7 and are retained in the flow channel 3, and the fragments are filtered and collected;

finally, if the water flow speed is reduced, after the work is finished, the fragments filtered by the channel filter screen 7 in the flow channel 3 can be cleaned, and the flow speed of the water flow can be recovered by the cleaned cofferdam frame 6, so that the working performance is recovered.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.