Corrosion test system for simulating in-reactor water chemical environment

Abstract

The embodiment of the invention discloses a corrosion test system for simulating an in-reactor water chemical environment. The corrosion test system comprises a shielding box, a test kettle, an uncovering assembly, a transfer opening, a transfer assembly and a control assembly. The test kettle is arranged in the shielding box and comprises a kettle body and a kettle cover movably arranged on the kettle body, the kettle body is used for being communicated with the in-reactor pipeline to form a test loop, and the kettle cover is used for installing a test hanging piece. The uncovering assembly is arranged in the shielding box and is used for driving the kettle cover to move relative to the kettle body, so that the kettle cover is separated from the kettle body. And the transfer port is arranged on the shielding box. The transfer assembly receives the test hanging piece through the transfer opening and transfers the test hanging piece to a target position. The control assembly is in communication connection with the uncovering assembly.

Description

Corrosion testing system for simulating in-reactor water chemistry environment Technical Field

[0001] This application relates to the field of in-core material corrosion testing technology, and in particular to a corrosion testing system for simulating the in-core water chemical environment. Background Technology

[0002] As the second barrier for nuclear fuel, the performance of reactor fuel cladding directly affects reactor safety. To study the behavior of key structural materials such as cladding under service conditions, especially their corrosion resistance, it is necessary to conduct in-reactor water chemical environment corrosion tests on key structural materials under high temperature and high pressure conditions, as well as under coolant water quality conditions after in-reactor seed irradiation.

[0003] However, the coolant used in corrosion tests is radioactive, which poses a safety hazard to analysts and the testing environment. Summary of the Invention

[0004] This application provides a corrosion testing system for simulating the water chemistry environment inside a reactor, including a shielded box, a test vessel, a lid opening assembly, a transfer port, a transfer assembly, and a control assembly. The test vessel is located inside the shielded box and includes a vessel body and a lid movably mounted on the vessel body. The vessel body is used to connect with in-reactor piping to form a test loop, and the lid is used to mount test plates. The lid opening assembly, located inside the shielded box, is used to move the lid relative to the vessel body to separate the lid from the vessel body. The transfer port is located on the shielded box. The transfer assembly receives the test plates through the transfer port and transfers the test plates to the target location. The control assembly is communicatively connected to the lid opening assembly.

[0005] In one possible implementation, the lid-opening assembly includes a mounting frame, a movable component, and a lid-opening drive component. The mounting frame is connected to a shielding box and has a first clearance opening corresponding to the test vessel. The movable component is movably mounted on the mounting frame and is communicatively connected to a control component. The lid-opening drive component is mounted on the movable component and is communicatively connected to the control component. The movable component can drive the lid-opening drive component to the first clearance opening, and a portion of the lid-opening drive component can pass through the clearance opening and contact the vessel lid, thereby separating the vessel lid from the vessel body.

[0006] In one possible implementation, the cover opening actuator is capable of vertical movement relative to the mounting frame.

[0007] In one possible implementation, the mounting frame further includes a second clearance opening, which is correspondingly connected to the transfer port. The moving component drives the lid-opening drive component away from the vessel body and to the second clearance opening. At least a portion of the transfer assembly can extend into the shielded box through the transfer port, and the transfer assembly corresponds to the second clearance opening.

[0008] In one possible implementation, the transfer assembly includes a transfer vehicle and a transfer container. The transfer container is mounted on the transfer vehicle and can extend into the shielded box through a transfer port. The transfer container includes a container body and a cover movably connected to the container body. The cover moves relative to the container body to expose the container opening, which corresponds to a second clearance opening.

[0009] In one possible implementation, the transfer container includes an inner cylinder and an outer cylinder, the inner cylinder for housing the test strips. The outer cylinder is fitted over the inner cylinder. The inner cylinder includes a lead layer and a first stainless steel layer covering the lead layer, and the outer cylinder includes a second stainless steel layer. The radial thickness of the lead layer is 50 mm, the radial thickness of the first stainless steel layer is 12.5 mm, and the radial thickness of the second stainless steel layer is 15.5 mm.

[0010] In one possible implementation, the corrosion testing system further includes a transfer fixture housed within a shielded box, used to transfer the test strips into the container body. The gripping end of the transfer fixture is equipped with a buffer sleeve.

[0011] In one possible implementation, the shielding box is equipped with a positioning part, and the transfer vehicle makes contact with the positioning part after passing through the transfer port.

[0012] In one possible implementation, the corrosion testing system further includes an inlet pipe and an outlet pipe. One end of the inlet pipe is connected to the reactor body, and the other end is connected to the outlet of the in-reactor piping. One end of the outlet pipe is connected to the reactor body, and the other end is connected to the inlet of the in-reactor piping.

[0013] In one possible implementation, the corrosion testing system further includes a water circuit control component and an electrochemical testing electrode. The water circuit control component is connected within the test circuit and is used to adjust the water chemical environment parameters within the test vessel. The electrochemical testing electrode is mounted on the vessel lid, with one end extending through the lid into the vessel body and the other end connected to an electrochemical analysis device.

[0014] Compared with existing technologies, the beneficial effects of this application are as follows: The corrosion testing system for simulating the in-reactor water chemical environment provided by this application includes a shielded box, a test vessel, a lid opening assembly, a transfer port, a transfer assembly, and a control assembly. The shielded box provides specific shielding. The test vessel is located inside the shielded box and includes a vessel body and a lid movably mounted on the vessel body. The vessel body is used to connect with in-reactor piping to form a test loop. The lid is used to install test plates, which undergo corrosion testing inside the test vessel. After the corrosion test is completed, the control assembly controls the lid opening assembly to move the lid relative to the vessel body, causing the lid to separate from the vessel body, thereby separating the test plates from the test vessel. The transfer port is located on the shielded box. The transfer assembly receives the test plates through the transfer port and transfers them to the target location, minimizing contact between analytical personnel and the radioactive environment. While obtaining key corrosion behavior data of the test plates, it also ensures the safety of personnel and the environment during the test.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 is a structural schematic diagram of the corrosion testing system provided in an embodiment of this application; Figure 2 is a structural schematic diagram of the cover opening component in a corrosion testing system provided in an embodiment of this application; Figure 3 is a partial structural schematic diagram of a corrosion testing system provided in an embodiment of this application; Figure 4 is a partial structural schematic diagram of a corrosion testing system provided in an embodiment of this application; Figure 5 is a partial structural schematic diagram of a corrosion testing system provided in an embodiment of this application.

[0018] Explanation of reference numerals in the attached drawings: 1 shielding box, 2 test vessel, 3 lid opening assembly, 30 mounting frame, 31 first clearance port, 33 second clearance port, 34 moving part, 35 lid opening drive component, 41 transfer vehicle, 42 transfer container, 5 control assembly, 61 water inlet pipe, 62 water outlet pipe, 63 water circuit control assembly, 64 electrochemical test electrode, 65 electrochemical analysis equipment. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0022] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0024] This application provides a corrosion test system for simulating the chemical environment of water inside a reactor, as shown in Figure 1, including a shielded box 1, a test vessel 2, a cover opening assembly 3, a transfer port, a transfer assembly, and a control assembly 5.

[0025] The shielding box 1 is made of shielding material. Specifically, the shielding material of the shielding box 1 is carbon steel. The shielding box 1 also has an inner lining and an outer lining, both of which are made of stainless steel plates. The shielding box 1 also has an operating surface, and the carbon steel plate corresponding to the operating surface is 90mm thick, providing a shielding capability approximately equivalent to 50mmPb.

[0026] It is worth noting that an observation window is provided at the operating surface, and the observation window is made of lead glass. The observation window consists of K509 shielding glass, tempered glass, ZF6 lead glass, and tempered glass, with the lead glass being 150mm thick.

[0027] The test vessel 2 is located inside the shielded box 1. The test vessel 2 includes a vessel body and a vessel lid, with the lid movably mounted on the vessel body. The vessel body is used to connect with the in-core piping to form a test loop. In-core cooling water flows into the test vessel 2 for corrosion testing and then flows out of the vessel body.

[0028] The vessel lid is used to install the test clips. It should be noted that the test clips can be installed directly on the lid, or indirectly on the lid. When the lid is detached from the vessel body, the test clips will detach from the vessel body simultaneously with the lid.

[0029] The lid opening assembly 3 is located inside the shielding box 1 and is used to move the lid relative to the vessel body to separate the lid from the vessel body. The transfer port is located on the shielding box 1.

[0030] The lid opening component 3 is used to realize the modular assembly and disassembly of the vessel lid, and also enables the automated opening and closing of the lid. The lid opening component 3 can also lift and move the vessel lid. During the lid lifting process, the lifting speed is ≤6mm / s, the positioning error is ≤1%, and a mechanical limit switch is installed.

[0031] Specifically, the bolt holes on the lid are numbered sequentially to open and close the lid. The bolt torque applied in the lid opening assembly 3 is 20 ft-lb, 40 ft-lb, 75 ft-lb, and 125 ft-lb, respectively. All bolts are tightened or loosened in four stages according to the torque.

[0032] The transfer component receives the test sample through the transfer port and transfers the test sample to the target location. The control component 5 is communicatively connected to the cover opening component 3.

[0033] The corrosion testing system for simulating the in-reactor water chemistry environment provided in this application includes a shielded box 1, a test vessel 2, a lid opening assembly 3, a transfer port, a transfer assembly, and a control assembly 5. The shielded box 1 provides specific shielding. The test vessel 2 is located inside the shielded box 1 and includes a vessel body and a lid movably mounted on the vessel body. The vessel body is used to connect with in-reactor piping to form a test loop, and the lid is used to install test plates. The test plates undergo corrosion testing within the test vessel 2. After the corrosion test is completed, the control assembly 5 controls the lid opening assembly 3 to move the lid relative to the vessel body, causing the lid to separate from the vessel body, thereby separating the test plates from the test vessel 2. The transfer port is located on the shielded box 1. The transfer assembly receives the test plates through the transfer port and transfers them to the target location, minimizing contact between analytical personnel and the radioactive environment. This ensures the safety of personnel and the environment during the testing process while obtaining key corrosion behavior data of the test plates.

[0034] In one possible implementation, as shown in Figures 2 and 3, the lid-opening assembly 3 includes a mounting frame 30, a movable component 34, and a lid-opening drive component 35. The mounting frame 30 is connected to the shielding box 1 and has a first clearance opening 31 corresponding to the test vessel 2. The movable component 34 is movably mounted on the mounting frame 30 and is communicatively connected to the control component 5. The lid-opening drive component 35 is mounted on the movable component 34 and is communicatively connected to the control component 5. The movable component 34 can drive the lid-opening drive component 35 to the first clearance opening 31, and a portion of the lid-opening drive component 35 can pass through the clearance opening and contact the vessel lid, thereby separating the vessel lid from the vessel body.

[0035] The mounting frame 30 is a perforated frame. A first clearance opening 31 is located on one side, and a second clearance opening 33 is located on the other side. The test vessel 2 is positioned below the first clearance opening 31. The movable component 34 can move along the mounting frame 30, switching back and forth between the first clearance opening 31 and the second clearance opening 33.

[0036] After the corrosion test is completed inside the test vessel 2, the moving part 34 drives the opening drive part 35 to move to the first clearance opening 31, which is located at the top of the test vessel 2. After the opening drive part 35 contacts the vessel lid, it removes the fastening bolts on the vessel lid, separating the vessel lid from the vessel body.

[0037] In one possible implementation, the lid-opening drive 35 is capable of vertical movement relative to the mounting frame 30. Then, the lid-opening drive 35 can cause the cover to rise, thereby lifting the test strip off the reactor vessel.

[0038] In one possible implementation, the mounting frame 30 further has a second clearance opening 33, which is correspondingly connected to the transfer port. The moving component 34 drives the lid-opening drive component 35 away from the vessel body and moves it to the second clearance opening 33. At least a portion of the transfer component can extend into the shielding box 1 through the transfer port, and the transfer component corresponds to the second clearance opening 33.

[0039] The moving component 34 drives the opening drive component 35, the vessel lid, and the test hanger away from the first clearance opening 31 and move to the second clearance opening 33. At this time, the transfer assembly has passed through the transfer opening and entered the shielded box 1, and the transfer container 42 in the transfer assembly is in an open state, located below the second clearance opening 33. At this time, the test hanger can be clamped by the transfer clamp, removed from the vessel lid, and transferred into the transfer container 42. After the transfer container 42 carries the test hanger and is sealed by the lid, it leaves the shielded box 1 by the transfer cart 41, transferring the test hanger to the target location.

[0040] In one possible implementation, as shown in Figures 4 and 5, the transfer assembly includes a transfer vehicle 41 and a transfer container 42. The transfer container 42 is mounted on the transfer vehicle 41 and can extend into the shielded box 1 through a transfer port. The transfer container 42 includes a container body and a cover movably connected to the container body. The cover moves relative to the container body to expose the container opening, which corresponds to the second clearance opening 33.

[0041] The transfer component is communicatively connected to the control component 5, which controls the transfer component. Specifically, the control component 5 can send transfer commands to the transfer component. According to the transfer command, the transfer vehicle 41 moves to the transfer port, and the transfer vehicle 41, carrying the transfer container 42, extends into the transfer port, positioning the transfer container 42 at the second clearance opening 33 to facilitate the carrying of the test hanging piece.

[0042] The lid in the transfer container 42 can automatically open and close relative to the container body. When the lid moves relative to the container body, the container opening of the container body is exposed. At this time, the container opening corresponds to the second clearance opening 33, which allows the test hanging piece to be transferred into the transfer container 42.

[0043] In one possible implementation, the corrosion testing system further includes a transfer clamp housed within the shielded box 1. The transfer clamp is used to transfer the test strip into the container body. The clamping end of the transfer clamp is equipped with a buffer sleeve. The buffer sleeve is used to prevent damage to the oxide layer on the surface of the test strip. Specifically, the buffer sleeve is a rubber sleeve.

[0044] In one possible implementation, the transfer container 42 includes an inner cylinder and an outer cylinder, the inner cylinder for housing the test strips. The outer cylinder is fitted over the inner cylinder. The transfer container 42 also includes a lid that covers the openings of the inner and outer cylinders.

[0045] The inner cylinder comprises a lead layer and a first stainless steel layer covering the lead layer, while the outer cylinder comprises a second stainless steel layer. The radial thickness of the lead layer is 50 mm, the radial thickness of the first stainless steel layer is 12.5 mm, and the radial thickness of the second stainless steel layer is 15.5 mm.

[0046] The top of the inner cylinder can also be equipped with lifting lugs, which can be used for lifting accessories for the hot chamber.

[0047] In one possible implementation, the shielding box 1 is equipped with a positioning part, and the transfer vehicle 41 makes contact with the positioning part after passing through the transfer port. When the transfer vehicle 41 contacts the positioning part, it can ensure that the transfer container 42 corresponds to the second clearance port 33, thereby facilitating the transfer of the test hanging piece into the container body.

[0048] In one possible implementation, the corrosion testing system further includes an inlet pipe 61 and an outlet pipe 62. One end of the inlet pipe 61 is connected to the reactor body, and the other end is connected to the outlet of the in-reactor piping. One end of the outlet pipe 62 is connected to the reactor body, and the other end is connected to the inlet of the in-reactor piping. The cooling water in the in-reactor piping can circulate through the test reactor 2, simulating a continuously flowing in-reactor water chemical environment within the test reactor 2.

[0049] Cooling water in the in-core piping flows into the test vessel 2 through the outlet and inlet pipe 61, and then returns to the in-core piping through the outlet pipe 62 and inlet, forming a circulating test loop.

[0050] Among them, the test vessel 2 includes a high temperature and high pressure test vessel. The maximum working temperature of the high temperature and high pressure test vessel is 350℃ and the maximum working pressure is 30MPa. The maximum working temperature and maximum working pressure can be achieved simultaneously and can be operated continuously for a long time (≥30 days).

[0051] The high-temperature and high-pressure test vessel has a volume of 5L and an inner diameter of 127mm. It is solidly forged from C276 Hastelloy alloy material with a wall thickness of 38mm. The vessel body has no welds and no lining.

[0052] The closure between the vessel lid and the vessel body is a flange type. Specifically, the vessel lid is sealed to the vessel body by multiple fastening bolts. For example, the number of fastening bolts may be 8, 10, or 12.

[0053] The lid is sealed using a C276 Hastelloy sealing ring with a beveled seal.

[0054] When the lid opening assembly 3 drives the lid to separate from the vessel body, the switching assembly will rotate and release the fastening bolts connecting the lid and the vessel body, so that the lid and the vessel body are no longer sealed.

[0055] Furthermore, a magnetic stirrer is installed inside the reactor vessel, which enables the simulation of a continuous-flow in-pile water chemical environment within the vessel. The rotation speed of the magnetic stirrer ranges from 0 to 3000 rpm.

[0056] The reactor body is also equipped with a plate loading bracket, which can provide plate loading function to realize corrosion test of multiple types of materials (≥20 pieces) in the in-pile water chemical environment.

[0057] Specifically, the plate loading support includes a first support and a second support. The first support is installed inside the vessel lid and has a fixed strip structure. The second support is mounted on the stirring shaft of the magnetic stirrer and has a rotating structure.

[0058] Furthermore, the test vessel 2 also includes thermocouples for monitoring the temperature inside the vessel. These thermocouples include C276 Hastelloy alloy sheathed tube type temperature monitoring thermocouples.

[0059] Furthermore, the test vessel 2 also includes a pressure sensor and a thermocouple for monitoring the pressure inside the vessel. The pressure sensor includes an electronic pressure sensor made of C276 stainless steel.

[0060] This application provides the test vessel 2 with real-time temperature and pressure monitoring and safety protection functions through thermocouples and pressure sensors.

[0061] The test vessel 2 is also equipped with a safety alarm module. The safety alarm module will work based on the detection values ​​of thermocouples and pressure sensors. When the detected temperature or pressure value exceeds the preset threshold, the safety alarm module will be activated and issue a warning.

[0062] In one possible implementation, the corrosion testing system further includes a water circuit control component 63 and an electrochemical test electrode 64. The water circuit control component 63 is connected to the test circuit and is used to adjust the water chemical environment parameters in the test vessel 2.

[0063] The electrochemical testing electrode 64 is disposed on the lid of the vessel, with one end of the electrochemical testing electrode 64 extending through the lid into the vessel body, and the other end of the electrochemical testing electrode 64 connected to the electrochemical analysis device 65.

[0064] The corrosion potential and corrosion rate of the test substrate can be obtained through the electrochemical testing electrode 64. The electrochemical analysis equipment 65 includes a multi-channel electrochemical integrated testing instrument. The electrochemical testing electrode 64 includes a high-temperature, high-pressure electrochemical electrode.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A corrosion testing system for simulating the chemical environment of water inside a reactor, characterized in that, include: Shielding box; A test vessel, located within the shielded enclosure, includes a vessel body and a lid movably mounted on the vessel body. The vessel body is used to connect with in-core piping to form a test loop, and the lid is used to mount test plates. A lid-opening assembly, located within the shielded enclosure, is used to move the lid relative to the vessel body to separate the lid from the vessel body. A transfer port is located on the shielded enclosure. A transfer assembly receives the test plates through the transfer port and transfers the test plates to a target location. A control assembly is communicatively connected to the lid-opening assembly.

2. The corrosion testing system according to claim 1, characterized in that, The lid-opening assembly includes: a mounting frame connected to the shielding box, the mounting frame having a first clearance opening corresponding to the test vessel; a movable component movably mounted on the mounting frame, the movable component being communicatively connected to the control component; and a lid-opening drive component mounted on the movable component, the lid-opening drive component being communicatively connected to the control component; wherein the movable component can drive the lid-opening drive component to move to the first clearance opening, and a portion of the lid-opening drive component can pass through the clearance opening and contact the vessel lid, thereby separating the vessel lid from the vessel body.

3. The corrosion testing system according to claim 2, characterized in that, The cover opening drive component is capable of vertical movement relative to the mounting frame.

4. The corrosion testing system according to claim 2, characterized in that, The mounting frame also has a second clearance opening, which is connected to the transfer port; the moving component drives the opening drive component away from the vessel body and moves to the second clearance opening; at least a portion of the transfer component can extend into the shielding box through the transfer port, and the transfer component corresponds to the second clearance opening.

5. The corrosion testing system according to any one of claims 1 to 4, characterized in that, The transfer assembly includes: a transfer vehicle; a transfer container disposed on the transfer vehicle, the transfer container being able to extend into the shielded box through the transfer port; wherein, the transfer container includes a container body and a cover movably connected to the container body, the cover being movable relative to the container body to expose the container opening of the container body, the container opening being used to correspond to the second clearance port.

6. The corrosion testing system according to claim 5, characterized in that, The transfer container includes: an inner cylinder for housing the test strip; and an outer cylinder fitted over the inner cylinder; wherein the inner cylinder includes a lead layer and a first stainless steel layer covering the lead layer, and the outer cylinder includes a second stainless steel layer; the radial thickness of the lead layer is 50 mm, the radial thickness of the first stainless steel layer is 12.5 mm, and the radial thickness of the second stainless steel layer is 15.5 mm.

7. The corrosion testing system according to claim 5, characterized in that, The corrosion testing system further includes a transfer clamp, which is located inside the shielded box. The transfer clamp is used to transfer the test clip into the container body. The clamping end of the transfer clamp is provided with a buffer sleeve.

8. The corrosion testing system according to claim 5, characterized in that, The shielding box is equipped with a positioning part, and the transfer vehicle makes limiting contact with the positioning part after passing through the transfer port.

9. The corrosion testing system according to any one of claims 1 to 4, characterized in that, The corrosion testing system further includes: a water inlet pipe, one end of which is connected to the reactor body, and the other end of which is connected to the outlet of the pipeline inside the reactor; and a water outlet pipe, one end of which is connected to the reactor body, and the other end of which is connected to the inlet of the pipeline inside the reactor.

10. The corrosion testing system according to claim 9, characterized in that, The corrosion testing system further includes: a water circuit control component connected to the test circuit, the water circuit control component being used to adjust the water chemical environment parameters inside the test vessel; and an electrochemical test electrode disposed on the vessel lid, one end of the electrochemical test electrode passing through the vessel lid and extending into the vessel body, the other end of the electrochemical test electrode being connected to an electrochemical analysis device.

Images