Holding device

Abstract

Holding device, in particular for attaching a high-pressure cooler (A) to a reactor coolant pump (B), with a first mounting assembly (1) for attachment to an upper area of ​​a cylinder of the high-pressure cooler (A), a second mounting assembly (10) for attachment to a lower area of ​​the cylinder of the high-pressure cooler (A), a third mounting assembly (4) for attaching the first mounting assembly (1) to a motor housing of the reactor coolant pump (B) and for attaching it to the mounting assembly (1), and a fourth mounting assembly (7) for attachment to the motor housing of the reactor coolant pump (A) and for attachment to the second mounting assembly (10) and to the third mounting assembly (4).

Description

[0001] The invention relates to a holding device, in particular for attaching a high-pressure cooler to a reactor coolant pump,

[0002] Reactor coolant pumps are a Class 1 nuclear safety device, the only active component in the primary circuit of the reactor island, and are considered the "heart" of the nuclear power plant. A high-pressure chiller with a wet weight of approximately 6 tons is used to cool the wet-wound motor. When the high-pressure chiller is wall-mounted, the position of the reactor coolant pump changes with the expansion or contraction of the circuit during temperature rises or falls in the primary circuit system in which the reactor coolant pump is located. This results in significant stress at the piping interface between the high-pressure chiller and the reactor coolant pump. This can then lead to a piping leak, a malfunction of the system, and, in the worst-case scenario, even a breach of the reactor coolant boundary, which can ultimately lead to a nuclear safety incident.If the high-pressure cooler is installed on the main body of the reactor coolant pump, the high-pressure cooler can move along with the reactor coolant pump, thus eliminating the problem of excessive load.

[0003] The interior space of a nuclear power plant's pump room is limited. The high-pressure cooler must be installed within this confined space, attached to the main body of the reactor coolant pump. Furthermore, both the high-pressure cooler and the mounting bracket for attaching it to the reactor coolant pump must be installed on-site. Finding a suitable mounting bracket is very difficult in this case. Moreover, the reactor coolant pump and the high-pressure cooler have already been designed and manufactured. Installing the high-pressure cooler on the reactor coolant pump requires modifications to the interfaces of both the cooler and the pump, reducing the wall thickness of the pressure relief valve and thus compromising its strength.

[0004] The object of this application is to provide a mounting device for installing a high-pressure cooler on a reactor coolant pump. The mounting device should have a compact structure, allow for convenient assembly and disassembly, and enable precise installation and positioning. It should also have a high load-bearing capacity and low weight, making it suitable for installation in a reactor coolant pump room with limited space.

[0005] This problem is solved by a holding device, in particular for attaching a high-pressure cooler to a reactor coolant pump, comprising a first mounting assembly for attachment to an upper region of a cylinder of the high-pressure cooler, a second mounting assembly for attachment to a lower region of the cylinder of the high-pressure cooler, a third mounting assembly for attaching the first mounting assembly to a motor housing of the reactor coolant pump and for attachment to the mounting assembly, and a fourth mounting assembly for attachment to the motor housing of the reactor coolant pump and for attachment to the second mounting assembly and to the third mounting assembly.

[0006] Advantageously, the first mounting assembly comprises a first arc-shaped connecting surface and a first connecting plate associated therewith, wherein the first connecting surface is arranged vertically and serves for welding to the outer wall of the high-pressure cooler, wherein the diameter of the first connecting surface corresponds to the outer diameter of the housing of the high-pressure cooler, and the first connecting plate is arranged horizontally and is provided with a plurality of first connecting holes for connecting the third mounting assembly (4).

[0007] In a further embodiment, the first connecting plate is provided with a positioning element located on the side facing the third mounting assembly.

[0008] Good stability is achieved when the first mounting assembly includes reinforcing ribs that connect the first arc-shaped connecting surface and the first connecting plate.

[0009] In a further advantageous embodiment, the second mounting assembly comprises an arc-shaped second connecting surface and a second connecting plate, which are connected to each other, wherein the second connecting surface is arranged vertically and serves for welding to the outer wall of the high-pressure cooler, wherein the diameter of the second connecting surface corresponds to the outer diameter of the housing of the high-pressure cooler, and the second connecting plate is arranged vertically and provided with a plurality of second connecting holes which serve for connecting the fourth mounting assembly.

[0010] In a further advantageous embodiment, the third mounting assembly comprises a third connecting plate and a fourth connecting plate arranged in parallel, wherein the third and fourth connecting plates are firmly connected to each other via at least two ribbed plates, wherein the third connecting plate is arranged horizontally and is provided with a plurality of third connecting holes for connecting to the first connecting plate of the first mounting assembly, and the fourth connecting plate is arranged horizontally, wherein several finger-like structures are provided on the side of the fourth connecting plate that is close to the reactor coolant pump, each of the finger-like structures being provided with fourth connecting holes for connecting to the reactor coolant pump, and on the side of the fourth connecting plate that is farther from the reactor coolant pump,Several fifth connection holes are provided for connecting the fourth mounting assembly.

[0011] In a further advantageous embodiment, the fourth mounting assembly comprises a fifth connecting plate and a sixth connecting plate connected to each other, wherein the fifth connecting plate is arranged horizontally and is provided with a plurality of sixth connecting holes for connecting to the fourth connecting plate of the third mounting assembly, and the sixth connecting plate is arranged vertically, wherein at the end of the sixth connecting plate, which is close to the fifth connecting plate, several seventh connecting holes are provided for connecting the reactor coolant pump, and at the end of the sixth connecting plate, which is farther from the fifth connecting plate, several eighth connecting holes are provided for connecting to the second connecting plate of the second mounting assembly.

[0012] To stiffen the sixth connecting plate, it is advantageously provided with reinforcing ribs.

[0013] Advantageously, the first and second mounting assemblies are made of austenitic stainless steel. The third and fourth mounting assemblies are made of high-strength, low-alloy steel.

[0014] It has proven particularly advantageous to use first superbolt nuts to connect to first bolts in the form of a threaded connection to firmly connect the third support assembly to the large flange of the reactor coolant pump motor housing, and to use second superbolt nuts to connect to second bolts in the form of a threaded connection to firmly connect the first support assembly and the third support assembly to each other.

[0015] The present application has the following beneficial effects: Given the limited space available in the reactor coolant pump room, this application provides a compact, small, and high-load-bearing support structure for installing the high-pressure cooler on the reactor coolant pump. Mechanical calculations are performed for the entire support structure. The first and second support assemblies are made of austenitic stainless steel, while the third and fourth support assemblies are made of high-strength, low-alloy steel. The support structure features an appropriate geometric design and materials that not only ensure load-bearing capacity but also minimize weight.

[0016] In this application, Superbolt nuts are used to fasten each mounting assembly. Compared to ordinary nuts, Superbolt nuts can provide more precise torque, are easy to install and remove, and can be used in a smaller workspace.

[0017] In this application, all installation connection points between the mounting device and the main body of the reactor coolant pump are centrally located on a single component, namely the large flange of the motor housing. No slots or holes are provided in the thinner-walled central section of the motor housing, thus preventing any reduction in the pressure-limit strength and also avoiding any impact on the mounting accuracy of the reactor coolant pump.

[0018] In this application, the mounting bracket and the high-pressure cooler are welded together. The installation interfaces between the mounting bracket and the reactor coolant pump side are machined after welding, thus preventing interference during connection to the reactor coolant pump side and improving positioning accuracy.

[0019] Further features and advantages of the invention will become apparent from the description of exemplary embodiments with reference to the drawings and from the drawings themselves.

[0020] They show: Fig. 1 a first view of the holding device according to the invention, Fig. 2 another view of the holding device according to the invention, Fig. 3 a detailed view of a first mounting assembly of the holding device, Fig. 4 a detailed view of a second mounting assembly of the holding device, Fig. 5 a detailed view of a third mounting assembly of the holding device, Fig. 6 a detailed view of a fourth mounting assembly of the holding device, Fig. 7 A view of the high-pressure cooler with first and second mounting assemblies, Fig. 8 a view of the reactor coolant pump with parts of the holding device and Fig. 9 A view of the reactor coolant pump with holding device and high-pressure cooler

[0021] The Fig. 1 and Fig. Figure 2 shows a mounting device for attaching a high-pressure cooler to a reactor coolant pump. The mounting device comprises a first mounting assembly 1 and a second mounting assembly 10, which are used to securely connect a high-pressure cooler to a reactor coolant pump. Fig. 7 and Fig. 9 high-pressure cooler A. Furthermore, a third mounting assembly 4 and a fourth mounting assembly 7 are shown, which are for connection to a high-pressure cooler A shown in the Fig. The reactor coolant pump B shown in section 8 serves this purpose.

[0022] As in the Fig. 2 and Fig. 3 in connection with the Fig. As shown in Figure 7, the first mounting assembly 1 serves to firmly connect to an upper part of a cylinder of the high-pressure cooler A. The first mounting assembly 1 comprises a first arcuate connecting surface 11 and a first connecting plate 12, which are connected to each other.

[0023] The first connecting surface 11 is arranged vertically and is welded to the outer wall of the high-pressure cooler A. The diameter of the first connecting surface 11 corresponds to the outer diameter of the housing of the high-pressure cooler A. Thus, the first connecting surface 11 can be closely fitted to the outer surface of the housing of the high-pressure cooler A, which facilitates subsequent welding operations.

[0024] The first connecting plate 12 is arranged horizontally and serves to connect to a third mounting assembly 4. The first connecting plate 12 is provided with a stepped positioning element 13 located on the side facing the third mounting assembly 4. The positioning element 13 serves to clamp the third mounting assembly 4 in place, preventing it from continuously sliding forward. This enables quick assembly and positioning of the third mounting assembly 4 and improves assembly efficiency. The first connecting plate 12 is provided with a number of first connection holes 14, which serve to connect and fasten it to the third mounting assembly 4.

[0025] Furthermore, the first support assembly 1 includes reinforcing ribs 15, each connected to the first connecting surface 11 and the first connecting plate 12, to increase the overall strength of the first support assembly 1.

[0026] As in the Fig. 2 and Fig. As shown in Figure 4, the second mounting assembly 10 serves to securely connect to a lower region of the cylinder of the high-pressure cooler A. The second mounting assembly 10 comprises a second arcuate connecting surface 101 and a second connecting plate 102, which are connected to each other.

[0027] The second curved connecting surface 101 is arranged vertically and serves for welding to the outer wall of the high-pressure cooler A. The diameter of the second connecting surface 101 corresponds to the outer diameter of the housing of the high-pressure cooler A. Thus, the second connecting surface 101 can be closely adapted to the outer surface of the housing of the high-pressure cooler A, which facilitates subsequent welding operations.

[0028] The second connecting plate 102 is arranged vertically and serves to connect to the fourth mounting assembly 7. The second connecting plate 102 is provided with a plurality of second connecting holes 103, which serve to connect and fasten to the fourth mounting assembly 7.

[0029] Since the high-pressure cooler A has a thin-walled cylindrical structure, it is more practical to connect the high-pressure cooler A to the first mounting assembly 1 and the second mounting assembly 10 by welding. In this embodiment, the first mounting assembly 1 and the second mounting assembly 10 are made of austenitic stainless steel, which facilitates welding to the high-pressure cooler A.

[0030] As in the Fig. 2 and Fig. As shown in Figure 5, the third mounting assembly 4 comprises a third connecting plate 41 and a fourth connecting plate 42 arranged in parallel, wherein the third connecting plate 41 and the fourth connecting plate 42 are firmly connected to each other via at least two rib plates 43.

[0031] The third connecting plate 41 is arranged horizontally and serves to connect to the first connecting plate 12 of the first mounting assembly 1. The third connecting plate 41 is provided with a plurality of third connecting holes 44, which serve to connect and fasten to the first connecting plate 12. The number of third connecting holes 44 corresponds to the number of first connecting holes 14, and the positions and sizes of the third connecting holes 44 are matched to those of the first connecting holes 14.

[0032] The fourth connecting plate 42 is arranged horizontally and serves to connect to both the reactor coolant pump B and the fourth mounting assembly 7. On the side of the fourth connecting plate 42 located near the reactor coolant pump B, several finger-like structures 45 are provided, each finger-like structure 45 having fourth connecting holes 46 for connecting and securing to the reactor coolant pump B. The size of the fourth connecting plate 42 is reduced by using the finger-like structures 45 as connecting elements for connecting to the reactor coolant pump B, thereby reducing its weight. On the side of the fourth connecting plate 42 furthest from the reactor coolant pump B, several fifth connecting holes 47 are provided for connecting and securing to the fourth mounting assembly 7.

[0033] As in the Fig. 2 and Fig. As shown in Figure 6, the fourth mounting assembly 7 comprises a fifth connecting plate 71 and a sixth connecting plate 72, which are connected to each other.

[0034] The fifth connecting plate 71 is arranged horizontally and serves to fasten the fourth connecting plate 42 of the third mounting assembly 4. The fifth connecting plate 71 is provided with a plurality of sixth connecting holes 73, which serve to connect and fasten to the fourth connecting plate 42. The number of sixth connecting holes 73 corresponds to the number of fifth connecting holes 47, and the positions and sizes of the sixth connecting holes 73 are matched to those of the fifth connecting holes 47.

[0035] The sixth connecting plate 72 is arranged vertically and serves for attachment to both the reactor coolant pump B and the second connecting plate 102 of the second mounting assembly 10. At the end of the sixth connecting plate 72 closest to the fifth connecting plate 71, several seventh connecting holes 74 are provided for connection and attachment to the reactor coolant pump B. At the end of the sixth connecting plate 72 furthest from the fifth connecting plate 71, several eighth connecting holes 75 are provided for connection and attachment to the second connecting plate 102. The number of eighth connecting holes 75 corresponds to the number of second connecting holes 103, and the positions and sizes of the eighth connecting holes 75 are matched to those of the second connecting holes 103.The sixth connecting plate 72 is provided with reinforcing ribs 76 to increase the structural strength of the sixth connecting plate 72.

[0036] In this embodiment, the third mounting assembly 4 and the fourth mounting assembly 7 are made of high-strength, low-alloy steel, which not only ensures load-bearing capacity but also reduces weight as much as possible. The third mounting assembly 4 is manufactured by a forging process, and the fourth mounting assembly 7 is manufactured by a rolling process, which improves the utilization rate of the overall manufacturing materials and also facilitates split installation in the reactor coolant pump chamber B.

[0037] The present application further provides an installation method for installing the high-pressure cooler into the reactor coolant pump using the holding device, comprising the following steps: Step 1: As in Fig. As shown in Figure 7, the first mounting assembly 1 and the second mounting assembly 10 are installed on the high-pressure cooler A to form a high-pressure cooler assembly. Step 2: Welding the first arc-shaped connecting surface 11 of the first support assembly 1 to an upper area of ​​the cylinder of the high-pressure cooler A and welding the second arc-shaped connecting surface 101 of the second support assembly 10 to a lower area of ​​the cylinder of the high-pressure cooler A, and Step 3: Machining the positioning element 13 and the first connecting holes 14 on the first connecting plate 12 of the first mounting assembly 1 and machining the second connecting holes 103 on the second connecting plate 102 of the second mounting assembly 10.

[0038] In this embodiment, three first connecting holes 14 and eight second connecting holes 103 are provided.

[0039] After welding the main bodies of the first mounting assembly 1 and the second mounting assembly 10 to the high-pressure cooler A, the connection holes for joining the first mounting assembly 1 and the second mounting assembly 10 to the third mounting assembly 4 and the fourth mounting assembly 7 are machined, thus preventing interference during the connection of the first mounting assembly 1 and the second mounting assembly 10 to the third mounting assembly 4 and the fourth mounting assembly 7, and thereby improving the accuracy of the connection and positioning.

[0040] Step 4: As in Fig. As shown in Figure 8, the third mounting assembly 4 and the fourth mounting assembly 7 are installed on the large flange C of the motor housing for the reactor coolant pump B to form a reactor coolant pump assembly.

[0041] Step 5: As in the Fig. 1, Fig. 2 and Fig. As shown in Figure 8, first positioning pins 5 are attached to the third mounting assembly 4. The first positioning pins 5 are inserted into corresponding positioning holes (not shown) on the large flange C of the motor housing and into corresponding positioning holes (not shown) on the third mounting assembly 4. First bolts 6 are guided through threaded holes (not shown) on the large flange C of the motor housing and through the fourth connecting holes 46, which are designed as through holes, on the third mounting assembly 4. First superbolt nuts 31 are used to securely connect the first bolts 6 to the third mounting assembly 4, thus firmly connecting the third mounting assembly 4 to the large flange C of the motor housing for the reactor coolant pump B.

[0042] Step 6: As in the Fig. As shown, second positioning pins 51 are attached to the fourth mounting assembly 7. The second positioning pins 51 are each inserted into corresponding positioning holes (not shown) on the large flange C of the motor housing and into corresponding positioning holes (not shown) in the fourth mounting assembly 7. First hexagonal screws 8 are guided through screw holes (not shown) on the large flange C of the motor housing and through the seventh connecting holes 74, which are designed as threaded bores, on the fourth mounting assembly 7 to firmly connect the fourth mounting assembly 7 to the large flange C of the motor housing for the reactor coolant pump B.A first seal, not shown in the illustrations, is used at the contact surface between the first hexagon screws 8 and the fourth mounting assembly 7 to fill the gaps and irregularities of the connecting surface, thereby ensuring a reliable and permanent threaded connection by pressure distribution, which prevents loosening or forms a seal.

[0043] Step 7: As in the Fig. 1, Fig. 2 and Fig. As shown in Figure 8, second hexagon screws 81 are guided through the fifth connecting holes 47 (designed as threaded holes) on the third mounting assembly 4 and the sixth connecting holes 73 (also designed as threaded holes) on the fourth mounting assembly 7 to firmly connect the third mounting assembly 4 and the fourth mounting assembly 7. Second seals, not shown in the figures, are used at the contact surfaces between the second hexagon screws 81 and the fourth mounting assembly 7.

[0044] Step 8: As in Fig. As shown, the high-pressure cooler assembly is installed on the reactor coolant pump assembly.

[0045] Step 9: As in the Fig. 1, Fig. 2 and Fig. As shown in Figure 9, the high-pressure cooler assembly is lifted to a corresponding height using an assembly lifting device and moved horizontally into the assembly position that corresponds to the reactor coolant pump assembly.

[0046] Step 10: As in the Fig. 1, Fig. 2 and Fig. As shown in Figure 9, second bolts 2 are successively inserted through the first through-holes 14 connecting holes on the first mounting assembly 1 and the third threaded holes 44 connecting holes on the third mounting assembly 4. Second Superbolt nuts 3 are used to securely connect the second bolts 2, thus firmly connecting the first mounting assembly 1 and the third mounting assembly 4.

[0047] Step 11: As in the Fig.As shown, third hexagon screws 82 are successively inserted through the second connecting holes 103 (designed as threaded holes) on the second mounting assembly 10 and the eighth connecting holes 75 (designed as threaded holes) on the fourth mounting assembly 7 to firmly connect the second mounting assembly 10 and the fourth mounting assembly 7. Third seals, not shown in the illustrations, are used on the contact surfaces between the third hexagon screws 82 and the fourth mounting assembly 7.

[0048] The order of the steps can be changed if necessary.

[0049] Given the limited space available in the reactor coolant pump room, this application provides a compact, small, and high-load-bearing support structure for installing the high-pressure cooler on the reactor coolant pump. Mechanical calculations are performed for the entire support structure. The first support assembly (1) and the second support assembly (10) are made of austenitic stainless steel, while the third support assembly (4) and the fourth support assembly (7) are made of high-strength, low-alloy steel. The support structure features a suitable geometry and materials that not only ensure load-bearing capacity but also minimize weight.

[0050] In this application, so-called superbolt nuts 3, 31 are used to fasten each mounting assembly 1, 10, 4, 7. Compared to ordinary nuts, superbolt nuts can provide more precise torque, are easy to install and remove, and can be fastened in a smaller working space.

[0051] In the present application, all installation connection interfaces between the holding device and the main body of the reactor coolant pump B are centrally located on a single component (i.e., the large flange C of the motor housing).

[0052] No slot / hole is provided in the middle part of the motor housing with thinner walls, thus avoiding a weakening of the strength of the pressure limit and also preventing impairment due to the assembly accuracy of the reactor coolant pump B.

[0053] In the present application, the mounting device and the high-pressure cooler A are welded together. The installation interfaces between the mounting device and the reactor coolant pump side are machined after welding, thereby preventing interference during connection to the reactor coolant pump side and thus improving positioning accuracy.

Claims

[1] Holding device, in particular for attaching a high-pressure cooler (A) to a reactor coolant pump (B), with a first mounting assembly (1) for attachment to an upper area of ​​a cylinder of the high-pressure cooler (A), a second mounting assembly (10) for attachment to a lower area of ​​the cylinder of the high-pressure cooler (A), a third mounting assembly (4) for attaching the first mounting assembly (1) to a motor housing of the reactor coolant pump (B) and for attaching it to the mounting assembly (1), and a fourth mounting assembly (7) for attachment to the motor housing of the reactor coolant pump (A) and for attachment to the second mounting assembly (10) and to the third mounting assembly (4). [2] Holding device according to claim 1, characterized by, that the first mounting assembly (1) comprises a first arc-shaped connecting surface (11) and a first connecting plate (12) associated therewith, wherein the first connecting surface (11) is arranged vertically and serves for welding to the outer wall of the high-pressure cooler, wherein the diameter of the first connecting surface (11) corresponds to the outer diameter of the housing of the high-pressure cooler, and the first connecting plate (12) is arranged horizontally and is provided with a plurality of first connecting holes (14) for connecting the third mounting assembly (4). [3] Holding device according to claim 2, characterized by , that the first connecting plate (12) is provided with a positioning element (13) which is located on a side facing the third mounting assembly (4). [4] Holding device according to any one of claims 1 to 3, characterized by, that the first support assembly (1) comprises reinforcing ribs (15) which each connect the first connecting surface (11) and the first connecting plate (12). [5] Holding device according to any one of claims 1 to 4, characterized by , that the second mounting assembly (10) comprises an arc-shaped second connecting surface (101) and a second connecting plate (102) connected to each other, wherein the second connecting surface (101) is arranged vertically and is used for welding to the outer wall of the high-pressure cooler (A), wherein the diameter of the second connecting surface (101) corresponds to the outer diameter of the housing of the high-pressure cooler (A), and the second connecting plate (102) is arranged vertically and is provided with a plurality of second connecting holes (103) for connecting the fourth mounting assembly (7). [6] Holding device according to any one of claims 1 to 5, characterized by, that the third support assembly (4) comprises a third connecting plate (41) and a fourth connecting plate (42) arranged in parallel, wherein the third and fourth connecting plates (41, 42) are firmly connected to each other via at least two ribbed plates (43), wherein the third connecting plate (41) is arranged horizontally and is provided with a plurality of third connecting holes (44) for connecting to the first connecting plate of the first support assembly (1), and the fourth connecting plate (42) is arranged horizontally, wherein on the side of the fourth connecting plate (42) that is close to the reactor coolant pump (B) several finger-like structures (45) are provided, each of the finger-like structures (45) being provided with fourth connecting holes (46) for connecting to the reactor coolant pump (B), and on the side of the fourth connecting plate (42) that is away from the reactor coolant pump (B),Several fifth connection holes (47) are provided for connecting the fourth mounting assembly (7). [7] Holding device according to any one of claims 1 to 6, characterized by, that the fourth support assembly (7) comprises a fifth connecting plate (71) and a sixth connecting plate (72) connected to each other, wherein the fifth connecting plate (71) is arranged horizontally and is provided with a plurality of sixth connecting holes (73) for connecting to the fourth connecting plate (42) of the third support assembly (4), and the sixth connecting plate (72) is arranged vertically, wherein at the end of the sixth connecting plate (72) that is close to the fifth connecting plate (71) several seventh connecting holes (74) are provided for connecting the reactor coolant pump (B), and at the end of the sixth connecting plate (72) that is farther from the fifth connecting plate (71) several eighth connecting holes (75) are provided for connecting the second connecting plate (102) of the second support assembly (10). [8] Holding device according to claim 7, characterized by, that the sixth connecting plate (72) is provided with reinforcing ribs (76). [9] Holding device according to any one of claims 1 to 8, characterized by , that the first support assembly (1) and the second support assembly (10) are made of austenitic stainless steel and the third support assembly (4) and the fourth support assembly (7) are made of high-strength low-alloy steel. [10] Holding device according to any one of claims 1 to 9, characterized by , that first superbolt nuts (31) are provided to form a fixed connection between the third support assembly (4) and a flange of the motor housing of the reactor coolant pump (B) with first bolts (6) in the form of a threaded connection, and that second superbolt nuts (3) are provided to form a fixed connection between the first support assembly (1) and the third support assembly (4) with second bolts (2) in the form of a threaded connection.

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