CN113744898B - Passive shutdown device and control method thereof - Google Patents
Passive shutdown device and control method thereof Download PDFInfo
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- CN113744898B CN113744898B CN202110888074.3A CN202110888074A CN113744898B CN 113744898 B CN113744898 B CN 113744898B CN 202110888074 A CN202110888074 A CN 202110888074A CN 113744898 B CN113744898 B CN 113744898B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
- G21C7/12—Means for moving control elements to desired position
- G21C7/14—Mechanical drive arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses an passive shutdown device and a control method thereof, wherein the device comprises a control rod, an ejection device, a stabilizer, a restraint device, a driving device, a logic circuit and a guiding device; one end of the control rod is provided with the stabilizer, and the other end of the control rod is provided with a guide device; below the stabilizerAnd an ejection device is arranged, one end of the restraint device is connected with the stabilizer, and the other end of the restraint device penetrates through the ejection device to be connected with the controller. The control rod is made of B 4 C, the control rod is positioned in a lead-based fast reactor coolant environment; the stabilizer is a counterweight device containing ferromagnetic metal, and an electromagnetic device is arranged at the bottom of the ejection device. The invention designs a shutdown device which performs passive shutdown by means of buoyancy and has an automatic recovery function by utilizing the high density characteristic of a lead-based fast reactor coolant. The emergency shutdown device has the greatest characteristics that the emergency shutdown function can be completed under the condition that the control rod driving mechanism is powered off, and the emergency shutdown device can be restored after the power supply is restored.
Description
Technical Field
The invention belongs to the field of mechanical control, and particularly relates to an passive shutdown device and a control method thereof.
Background
Nuclear reactors, also known as nuclear reactors or reactors, are devices that maintain a controlled, self-sustaining chain-type nuclear fission reaction to achieve nuclear energy utilization. The nuclear reactor enables a self-sustaining chain-type nuclear fission process to occur therein without supplementing a neutron source by reasonably arranging nuclear fuel. In order to control the reactor power during operation of a nuclear reactor, it is often necessary to regulate the reactor power by means of strong neutron absorbers and control rods.
The material of the control rod is generally composed of B 4 C is made, can be divided into 3 kinds according to the purpose of the control rod: compensating rod, regulating rod and safety rod. Wherein the safety bar is a device for safely shutting down the reactor by rapidly dropping the bar. Safety rod drive mechanisms are critical devices for reliable operation and safe shutdown of a reactor. Safety considerations should prevent the safety rod drive from failing to function properly in the event of a power outage, and passive emergency shutdown devices are also typically deployed in nuclear reactors. The passive emergency drop rod adopted by the traditional pressurized water reactor utilizes the gravitational potential energy of the control rod, the electromagnetic force at the end part of the control rod disappears after the power failure accident occurs, and the control rod falls into the reactor core of the nuclear reactor under the action of gravity to finish shutdown. However, in the case of a lead-based fast reactor, the coolant is liquid lead or lead bismuth, the density is far greater than that of the control rods, and the control rods are difficult to insert into the reactor core by gravity under the action of a huge density difference. Adding to the control rodThe upper counterweight can ensure that the control rod is inserted into the reactor core by gravity, but brings new trouble: firstly, heavy metals are expensive, and the manufacturing cost of adding a counterweight on a control rod is high; next, the control rods are arranged to have a density substantially greater than 10275kg/m 3 The rod falling function can be well realized, so that a great amount of energy is consumed for hanging the control rod when the emergency shutdown is not triggered; finally, the viscous resistance of the liquid metal is greater than that of water, and the control rod can be inserted into the reactor core by means of self gravity, but the control rod is easy to cause unbalanced posture and even is blocked in the reactor. Therefore, the passive shutdown task is difficult to complete by adopting the traditional rod dropping mode.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention discloses a passive shutdown device and a control method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention aims at realizing the following technical scheme:
a passive stack stopping device comprises a control rod, an ejection device, a stabilizer, a constraint device, a driving device, a logic circuit and a guiding device;
one end of the control rod is provided with the stabilizer, and the other end of the control rod is arranged in the guide device; an ejection device is arranged below the stabilizer, one end of the restraint device is connected with the stabilizer, and the other end of the restraint device penetrates through the ejection device to be connected with the controller.
The control rod is made of B 4 C, the control rod is positioned in a lead-based fast reactor coolant environment;
the stabilizer is a counterweight device containing ferromagnetic metal, an electromagnetic device is arranged at the bottom of the ejection device, the electromagnetic device is electrified when the emergency shutdown is not triggered, the stabilizer is magnetically connected with the electromagnetic device, and the ejection device is in a compressed state.
As a further development of the invention, the ejection device comprises a spring which is in a compressed state when the emergency shutdown is not triggered.
As a further development of the invention, the restraining means is a flexible metal chain.
As a further improvement of the present invention, the controller includes a driving device and a logic circuit;
the driving device is connected with the constraint device;
the logic circuit is electrically connected with the driving device and the electromagnetic device.
As a further development of the invention, the drive is an electric motor.
As a further development of the invention, the guide means comprise at least one coaxial ring or cylindrical sleeve.
A control method of an passive shutdown device comprises the following steps:
when the passive emergency shutdown signal is triggered, the loop of the electromagnetic device is powered off, the electromagnetic force of the stabilizer disappears, and the spring ejects the control rod;
when the nuclear reactor is restarted, the starting mechanism works to retract the restraining device, the stabilizer is electrified to generate electromagnetic force to fix the control rod at the bottom, and the driving device releases the restraining device after the fixation is completed, so that the tension of the restraining device is eliminated.
As a further improvement of the invention, the method specifically comprises the following steps:
s1, when the passive emergency shutdown is not triggered, the stabilizer fixes the control rod at the bottom of the nuclear reactor by utilizing electromagnetic force, and at the moment, the restraint device has no tension;
s2, when the passive emergency shutdown is triggered, electromagnetic force of the stabilizer disappears, the ejection device ejects the control rod, the guide device stabilizes the gesture of the control rod at the initial stage after the control rod is ejected, and the gesture and the movement track of the control rod can be well maintained under the action of initial kinetic energy, so that the control rod is inserted into the reactor along a preset track;
s3, in the middle period after the control rod pops up, the stabilizer is used as a counterweight to change the gravity center position of the control rod so as to adjust the gesture of the control rod, and the middle section of the control rod insertion is required to be jointly participated in controlling the gesture and the movement track of the control rod by the guide device and the stabilizer;
s4, providing pulling force and a stabilizer by a restraint device to participate in controlling the gesture and the movement track of the control rod at the end section of the control rod after being ejected;
s5, after the passive emergency shutdown is completed, the system is kept stable and still, and the system is prepared for restoration after the power supply is restored;
s6, after the power supply is restored and the restarting signal is received, the driving device pulls the restraining device to pull the control rod back, in the process, the guiding device is used for keeping the attitude of the control rod in the initial stage of the restoration process, the guiding device and the stabilizer are used for keeping the attitude of the control rod in the middle stage of the restoration, the stabilizer and the restraining device are used for keeping the attitude of the control rod in the ending stage of the restoration and finally the control rod is stabilized at the bottom of the reactor core to wait for next task.
Compared with the background art, the invention has the following beneficial effects:
the lead-based fast reactor passive emergency shutdown device changes the mode that the traditional rod falling device falls rods by gravity, and designs the floating type passive emergency shutdown device by utilizing the characteristic of high density of a lead-based fast reactor coolant. The invention can solve the problem of passive shutdown of the lead-based fast reactor. And considering that the viscosity of liquid metal is high, three devices for stabilizing the control rod are designed for restraining the gesture and track of the control rod at different stages of the movement of the control rod, and finally a driving mechanism is designed to enable the passive shutdown device to restore the original position and wait for the next task when restarting the nuclear reactor. The device can automatically reset, and reduces the preparation work for restarting the nuclear reactor in the later period compared with the traditional rod dropping device. The invention comprises a device for controlling the rod motion in multiple stable ways, can well complete rod insertion and has high reliability.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. In the drawings:
FIG. 1 is a schematic diagram of an inactive shutdown device in an inactive state.
FIG. 2 is a schematic diagram of the end of the passive shutdown device.
FIG. 3 is a schematic diagram of the change of the operating state of the passive shutdown device.
FIG. 4 is a graph of the effect of stabilizer weights on control rod stress.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
As shown in fig. 1 and 2, the passive shutdown device of the present invention utilizes the large buoyancy generated by the high density of the lead-based fast reactor coolant. The emergency shutdown task is completed when the shutdown device is powered off in a mode of ejection, buoyancy, constraint and recovery, so that accidents of the nuclear reactor are prevented.
The passive shutdown device: control rod 1, ejection device 2, stabilizer 3, restraint device 4, driving device 5, logic circuit 6, and guiding device 7;
one end of the control rod 1 is provided with the stabilizer 3, and the other end is provided with a guide device 7; an ejection device 2 is arranged below the stabilizer 3, one end of a restraint device 4 is connected with the stabilizer 3, and the other end of the restraint device penetrates through the ejection device 2 to be connected with a controller.
The material of the control rod 1 is B 4 C, the control rod 1 is in a lead-based fast reactor coolant environment;
the stabilizer 3 is a counterweight device containing ferromagnetic metal, an electromagnetic device is arranged at the bottom of the ejection device 2, when the emergency shutdown is not triggered, the electromagnetic device is electrified, the stabilizer 3 is magnetically connected with the electromagnetic device, and the ejection device 2 is in a compressed state.
The functions and functions of the specific structures are as follows:
wherein, the control rod 1 has good neutron absorption capacity, and the control rod 1 adopts B generally 4 C material, and control rod material B of lead-based fast reactor coolant density ratio 4 C is much larger in density, the control rod can be subjected to large buoyancy in the coolant, so that the conventional free falling mode cannot be adopted for passive stack stopping, and the passive stack stopping device provided by the invention utilizes the buoyancy as a drive, and utilizes the large density difference between the control rod 1 and the coolant to provide enough driving force for the control rod 1.
The ejection device 2 has a core component of a spring, and the ejection device is in an energy storage state when the emergency shutdown is not triggered, namely the spring is in a compressed state. During normal operation of the nuclear reactor, current is present in the loop, the electromagnetic device of the stabilizer 3 participates in operation to fix the control rod 1 at the bottom of the nuclear reactor, and the ejection device is in an energy storage state.
The stabilizer 3 is a counterweight device containing ferromagnetic metal and positioned at the lower end of the control rod 1, and has two functions in the passive shutdown device:
the action is as follows: the control rod 1 is stabilized at the bottom of the reactor by utilizing electromagnetic force during normal operation of the nuclear reactor;
the second action is: after the passive shutdown is triggered, the control rod 1 is ejected, and the gravity center position of the control rod 1 is changed to keep the stable posture of the control rod 1 in the upward movement process under the buoyancy effect.
And the restraint device 4 is a flexible metal chain, and the flexibility of the restraint device 4 is that the restraint device 4 does not obviously influence the operation of the control rod 1 when the control rod 1 pops up, and the metal material prevents the corrosion of the high-temperature coolant. There are two roles:
the action is as follows: after the control rod pops up, the control rod is pulled by pulling force to keep a vertical state;
the second action is: after the shutdown task is completed, the control rod is reset by the traction of the driving device 5.
The driving device 5 is a motor and is used for providing power for completing the emergency shutdown, and the control rod 1 is reset through the traction constraint device 4.
The guiding device 7 is a cylindrical sleeve which can be replaced by two coaxial rings, and the restraining device can keep the ejected posture of the control rod 1 by limiting the freedom degree of the control rod and finish the homing of the control rod 1 when the driving device 5 is matched to restart the stack after the work is finished.
The logic circuit 6 is used for triggering the passive shutdown device and a control circuit which is restored after the passive shutdown device is completed. The circuit logic is as follows: when the passive emergency shutdown signal is triggered, the loop is powered off, the electromagnetic force of the stabilizer 3 disappears, and the spring ejects the control rod. When the nuclear reactor is restarted, the starting mechanism works to retract the restraining device 4, the stabilizer 3 is electrified to generate electromagnetic force to fix the control rod at the bottom, and the driving device 5 releases the restraining device after the fixing is completed, so that the tension of the restraining device 4 disappears to ensure that the control rod 1 can be effectively ejected when the reactor is in emergency shutdown next time.
As shown in fig. 4, the passive scram device is stationary at the bottom of the nuclear reactor when the nuclear reactor is not triggering the passive scram device. The stabilizer and the restraint device are arranged at the lower end of the control rod, wherein the stabilizer is a counterweight device with ferromagnetic metal. During normal operation of the nuclear reactor, the passive emergency shutdown device is energized, the device with the electromagnet will adsorb the stabilizer and fix the control rod to the bottom of the nuclear reactor, and the ejection device is in a compressed state.
The magnitude of the electromagnetic force should be:
F magnetic field ＝ξ(F Floating device +F Bullet -F Heavy weight )
Wherein F is Magnetic field F is electromagnetic adsorption force Heavy weight To control the total weight of the rod, stabilizer and constraint, F Floating device To control the rods, stabilizers and constrain the total buoyancy received, F Bullet Is the elasticity of the spring, and xi is the safety coefficient, taking 1<ξ≤2。
When the passive emergency shutdown signal is triggered, the system is powered off, the electromagnetic force disappears, the control rod is stressed in unbalanced state, the control rod flies out from bottom to top under the action of buoyancy and spring force, and the acceleration is as follows during the flying out:
wherein a is the acceleration of the control rod when flying out, M Rod For controlling the total mass of the rod, stabilizer, restraint device. To ensure smooth insertion of the control rods into the core, guides are provided at the bottom of the core for constraining the initial direction of movement of the control rods, the guides should not be higher than the tips of the control rods in the inactive state as shown in FIG. 1. The guide device can adopt a cylindrical barrel structure or a double-ring structure, and the length of the cylindrical barrel and the distance between the double rings are selected according to the length of the control rod. It should not be too large or too small. When the control rods are fully inserted into the core,the guide should be no lower than the bottom end of the control rod as shown in fig. 2.
The ejection system ejects the control rod to the control rod, the elastic action of the ejection device is not received, the resistance to the control rod is gradually increased along with the increase of the speed of the control rod, the control rod reaches the maximum speed when the resultant force is 0, and then the control rod rises at the constant speed. The maximum speed of the control rod is:
wherein V is max For the maximum speed possible of the control rod, ε is the drag coefficient, which is related to the kinematic viscosity of the coolant.
When the control rod moves to the middle section, the action of the guide device is weakened, and a stabilizer is arranged at the bottom end of the control rod in order to maintain the posture and the movement direction of the control rod. The working principle of the stabilizer is as shown in fig. 3, the stabilizer is a counterweight device with ferromagnetic metal, the density of the counterweight device is as much as possible larger than that of the control rod, thus the resultant force born by the lower end of the control rod is small, the resultant force born by the upper end of the control rod is large, and when the control rod is reversely inclined, the resultant force of the upper end generates a larger torque to enable the control rod to restore to the vertical state again.
When the control rod moves to the end section, as shown in fig. 2, the guiding means are substantially lost, and the restraining means are connected to the bottom end of the control rod in addition to the stabilizer for restraining the final state of the control rod. The restraining device maintains the position of the control rod after the control rod is inserted into the reactor core so that the control rod does not deflect or float, and can simulate the floating state of the balloon in the air, so that the lower end of the balloon is restrained through flexibility in order to maintain the stable state of the balloon. Lead-based fast reactors are relatively high in operating temperature and have certain corrosiveness, and common materials are difficult to apply to the environment. The wire made of metal is too thin to be broken, too thick and flexible, and is not good to interfere with the movement of the control rod in the control rod ascending stage, so that a chain structure is adopted.
In the restarting stage after the passive emergency shutdown device completes the shutdown task, the driving device can retract the restraint device through the driving motor, the guide device, the restraint device and the stabilizer still keep the original functions of the restraint device in the retracting process, and then the ejection device is compressed under the traction of the driving device and the restraint device to be in an energy storage state and is fixed at the bottom end through the electromagnet. The motor stops working, the restraint device is released, and the system is restored to an initial state. It is noted that the restraining device should be in a relaxed state after returning to the initial state, which is done in order to ensure that the control rods are inserted into the core as soon as possible during a passive scram.
As shown in fig. 3, the present invention further provides a control method of the passive shutdown device, including the following steps:
when the passive emergency shutdown signal is triggered, the loop of the electromagnetic device is powered off, the electromagnetic force of the stabilizer 3 disappears, and the spring ejects the control rod;
when the nuclear reactor is restarted, the starting mechanism works to retract the restraint device 4, the stabilizer 3 is electrified to generate electromagnetic force to fix the control rod 1 at the bottom, and after the fixation is completed, the driving device 5 releases the restraint device 4, so that the tension of the restraint device 4 is eliminated.
Triggering a logic circuit of the passive shutdown device, the passive ejection device, posture correction, posture and position constraint and completing system recovery after the passive shutdown; the working steps of the passive shutdown device are as follows:
s1, when the passive emergency shutdown is not triggered in the initial stage, the stabilizer 3 fixes the control rod at the bottom of the nuclear reactor by utilizing electromagnetic force, and at the moment, the restraint device 4 has no tension;
s2, when the passive emergency shutdown is triggered, the electromagnetic force of the stabilizer 4 disappears, the ejection device 2 ejects the control rod, the guide device 7 stabilizes the gesture of the control rod 1 at the initial stage after the ejection of the control rod 1, and the gesture and the movement track of the control rod 1 can be well maintained under the action of initial kinetic energy, so that the control rod 1 is inserted into the reactor along the preset track;
s3, in the middle period after the control rod 1 pops up, the slender control rod 1 is easy to lose the vertical posture under the action of buoyancy, the stabilizer is used as a counterweight to change the gravity center position of the control rod so as to adjust the posture of the control rod, and the middle section of the control rod 1 insertion is required to participate in controlling the posture and the movement track of the control rod 1 by the guide device 7 and the stabilizer 3;
s4, providing pulling force by the restraint device 4 and the stabilizer 3 to participate in controlling the gesture and the movement track of the control rod 1 at the last section of the control rod 1 after being ejected;
s5, after the passive emergency shutdown is completed, the system is kept stable and still, and the system is prepared for restoration after the power supply is restored;
s6, after the power is restored and a restarting signal is received, the driving device 5 pulls the restraining device 4 to pull the control rod 1 back, in the process, the guiding device 7 is used for keeping the attitude of the control rod 1 in the initial stage of the restoration process, the guiding device 7 and the stabilizer 3 are used for keeping the attitude of the control rod 7 in the middle stage of the restoration, the stabilizer 3 and the restraining device 4 are used for keeping the attitude of the control rod 7 in the ending stage of the restoration and finally the control rod is stabilized at the bottom of the reactor core to wait for the next task.
The foregoing is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes of the foregoing embodiments according to the technical matter of the present invention still fall within the scope of the technical solution of the present invention.
It should be noted that, in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and to distinguish between similar objects, and there is no order of preference between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the applicant be deemed to have such subject matter not considered to be part of the disclosed subject matter.
Claims (6)
1. The control method of the passive shutdown device is characterized by comprising a control rod (1), an ejection device (2), a stabilizer (3), a constraint device (4), a driving device (5), a logic circuit (6) and a guide device (7);
one end of the control rod (1) is provided with the stabilizer (3), and the other end is arranged in the guide device (7); an ejection device (2) is arranged below the stabilizer (3), one end of the restraint device (4) is connected with the stabilizer (3), and the other end of the restraint device passes through the ejection device (2) to be connected with the controller;
the control rod (1) is made of B 4 C, the control rod (1) is in a lead-based fast reactor coolant environment;
the stabilizer (3) is a counterweight device containing ferromagnetic metal, an electromagnetic device is arranged at the bottom of the ejection device (2), when the emergency shutdown is not triggered, the electromagnetic device is electrified, the stabilizer (3) is magnetically connected with the electromagnetic device, and the ejection device (2) is in a compressed state;
the control method of the passive shutdown device comprises the following steps:
when the passive emergency shutdown signal is triggered, the loop of the electromagnetic device is powered off, the electromagnetic force of the stabilizer (3) disappears, and the spring ejects the control rod;
when the nuclear reactor is restarted, the starting mechanism works to retract the restraining device (4), the stabilizer (3) is electrified to generate electromagnetic force to fix the control rod (1) at the bottom, and the driving device (5) releases the restraining device (4) after the fixation is completed, so that the tension of the restraining device (4) is eliminated;
the method specifically comprises the following steps:
s1, when the passive emergency shutdown is not triggered, the stabilizer (3) fixes the control rod (1) at the bottom of the nuclear reactor by utilizing electromagnetic force, and at the moment, the restraint device (4) has no tension;
s2, when triggering the passive emergency shutdown, the electromagnetic force of the stabilizer (3) disappears, the ejection device (2) ejects the control rod, the guide device (7) stabilizes the gesture of the control rod (1) at the initial stage after the control rod (1) is ejected, and the gesture and the movement track of the control rod (1) can be well maintained under the action of initial kinetic energy, so that the control rod (1) is inserted into the reactor along the preset track;
s3, in the middle period after the control rod (1) pops up, the stabilizer (3) is used as a counterweight to change the gravity center position of the control rod so as to adjust the gesture of the control rod, and the middle section of the insertion of the control rod (1) is required to be jointly participated in the gesture and the movement track of the control rod (1) by the guide device (7) and the stabilizer (3);
s4, providing pulling force and a stabilizer (3) by a restraint device (4) to participate in controlling the gesture and the movement track of the control rod (1) at the last section of the control rod (1) after being ejected;
s5, after the passive emergency shutdown is completed, the system is kept stable and still, and the system is prepared for restoration after the power supply is restored;
s6, after the power supply is restored and a restarting signal is received, the driving device (5) pulls the restraining device (4) to pull the control rod (1) back, in the process, the guiding device (7) is used for keeping the gesture of the control rod (1) in the initial stage of the restoration process, the guiding device (7) and the stabilizer (3) are used for keeping the gesture of the control rod (7) in the middle stage of the restoration, the stabilizer (3) and the restraining device (4) are used for keeping the gesture of the control rod (7) in the ending stage of the restoration and finally the control rod is stabilized at the bottom of the reactor core to wait for next task.
2. A control method of an passive shutdown device according to claim 1, characterized in that the ejection device (2) comprises a spring, which is in a compressed state when the emergency shutdown is not triggered.
3. A control method of an passive shutdown device according to claim 1, characterized in that the restraining means (4) is a flexible metal chain.
4. A control method of an passive shutdown device according to claim 1, characterized in that the controller comprises a driving device (5) and a logic circuit (6);
the driving device (5) is connected with the constraint device (4);
and the logic circuit (6), wherein the logic circuit (6) is electrically connected with the driving device (5) and the electromagnetic device.
5. A control method of an passive shutdown device according to claim 1, characterized in that the drive means (5) is an electric motor.
6. A control method of an passive shutdown device according to claim 1, characterized in that the guiding means (7) comprise at least one coaxial ring or cylindrical sleeve.
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| CN108695004B (en) * | 2018-05-18 | 2019-04-09 | 西安交通大学 | Waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type |
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