CN111599499B - Method for measuring rod drop time of control rod driving mechanism - Google Patents
Method for measuring rod drop time of control rod driving mechanism Download PDFInfo
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- CN111599499B CN111599499B CN202010304973.XA CN202010304973A CN111599499B CN 111599499 B CN111599499 B CN 111599499B CN 202010304973 A CN202010304973 A CN 202010304973A CN 111599499 B CN111599499 B CN 111599499B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/06—Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination
- G21C17/063—Burn-up control
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
- G21C17/102—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain the sensitive element being part of a fuel element or a fuel assembly
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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
Abstract
The invention relates to a method for measuring rod falling time of a control rod driving mechanism, which comprises the steps of measuring the actual rotating angle of the driving mechanism through an angular displacement sensor arranged at the joint of the driving mechanism and a transmission mechanism, and recording the current system time t when a system sends a mechanism resetting instruction1When detecting that the difference value between the rotation value measured by the angular displacement sensor and the target value set by the system is smaller than a first threshold value, recording the current system time t2Difference of two times (t)2‑t1) Is the drop time of the control rod drive mechanism. The method can also be used for verifying the rod drop time of the control rod drive mechanism through the optical coding value measured by the photoelectric encoder arranged on the control drum component of the control rod drive mechanism. The method has strong operability and high reliability, and can be applied to the homing test of the control rod of a special reactor.
Description
Technical Field
The invention belongs to the technical field of nuclear reactor design, and particularly relates to a method for measuring rod drop time of a control rod driving mechanism.
Background
The rod falling time of a nuclear reactor control rod is one of important parameters for safety analysis of a nuclear power plant and guarantee of safe operation of the nuclear power plant. Meanwhile, the rod falling time is also used as an important index for judging whether the design of the nuclear reactor driving mechanism is reasonable and feasible.
The rod drop time of the control rod of the existing nuclear power station is measured by the change of the coil induced voltage of a detector coil of a rod position monitoring system and the coil current in a driving mechanism. The starting point and the key criterion for measuring the rod falling time of the control rod are different aiming at the special small reactors with complex and compact structures and the great difference between the reactor types and the conventional reactor. The traditional method for measuring the induced voltage of the detection coil and the current of the coil in the driving mechanism is difficult to be applied to the special reactor types, so that a new method for measuring the rod falling time of the control rod driving mechanism needs to be designed.
Disclosure of Invention
The invention aims to provide a method for measuring rod falling time of a control rod driving mechanism aiming at a complicated and special driving mechanism of a small reactor, so as to realize accurate measurement of the rod falling time.
The technical scheme of the invention is as follows: a method for measuring the rod falling time of control rod drive mechanism includes such steps as measuring the actual rotation angle of drive mechanism by the angular displacement sensor installed at the joint between drive mechanism and drive mechanism, and recording the current system time t when the system has reset instruction1When detecting that the difference value between the rotation value measured by the angular displacement sensor and the target value set by the system is smaller than a first threshold value, recording the current system time t2Difference of two times (t)2-t1) Is the drop time of the control rod drive mechanism.
Further, according to a preferred embodiment of the method for measuring the rod drop time of the control rod drive mechanism of the present invention, the actual rotation angle of the control drum assembly is measured by the photoelectric encoder mounted on the control drum assembly of the control rod drive mechanism, and when the system issues a mechanism reset command, the current system time t is recorded1When the optical coding value and the system setting measured by the photoelectric encoder are detectedWhen the difference between the target values is smaller than a second threshold value, the current system time t is recorded3Difference of two times (t)3-t1) As a check on the drop time of the control rod drive mechanism.
Further, according to the preferred embodiment of the method for measuring the rod drop time of the control rod driving mechanism, the rotation value measured by the angular displacement sensor is obtained through the rotation processor of the comprehensive test platform, the optical encoding value measured by the photoelectric encoder is obtained through the optical encoding collection board card, and the data is transmitted to the measurement and control software for processing. And the acquisition frequency of the comprehensive test platform to the rotation value and the optical coding value is 20 ms.
Further, according to a preferred embodiment of the method for measuring the rod drop time of the control rod drive mechanism of the present invention, the first threshold value is 0 to 1.5 °, and the second threshold value is 0 to 1.5 °.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method for measuring the rod drop time of the control rod driving mechanism does not depend on a voltage or current signal of a monitoring system, timely and accurately determines the reset moment of the control rod driving mechanism through the change of the rotation angle, and has strong operability and high reliability;
(2) the rotational value measured by the angular displacement sensor and the optical coding value measured by the photoelectric encoder are mutually verified, so that the reasonability of measurement can be ensured, and the problems existing in the structural design of a control system can be timely found and corrected;
(3) when the angular displacement sensor fails, the resetting time of the control rod driving mechanism can still be determined by the optical coding value measured by the photoelectric encoder, so that the practicability of the system is further improved.
Drawings
FIG. 1 is a flow chart of a method for measuring drop time of a control rod drive mechanism in an embodiment of the present invention;
fig. 2 is a system logic structure diagram of the mechanism homing test in the embodiment of the present invention.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and examples. It is clear that the described embodiments are only intended to illustrate the technical solutions of the present invention and do not limit the scope of protection thereof. Other embodiments, which are directly accessible to the person skilled in the art on the basis of the described embodiments without inventive labour, are likewise within the scope of protection of the present invention.
The control rod drive system mainly comprises: the control drum assembly comprises a control drum assembly, a distribution mechanism, a transmission mechanism, a driving mechanism, a shell containing the components, a support structure of the shell, and the like. The driving mechanism mainly comprises a double-step motor (a motor and a motor B), a speed reducer, an electromagnetic clutch, a spring releasing mechanism and an angular displacement sensor. The electromagnetic clutch realizes the functions of separating and connecting the stepping motor, the speed reducer and the spring release mechanism. In the initial state, the drive mechanism spring is in a released state and the output shaft is in the "0" position. After the driving mechanism receives the rotation control signal, the stepping motor rotates, the rotation is transmitted to the output shaft after the rotation control signal passes through the speed reduction of the speed reducer and the electromagnetic clutch, the output shaft drives the external load to rotate, the control of the control drum system executing mechanism is realized, and then the reactor power is adjusted. In the process of the rotation of the output shaft, the gear drives the rack to compress the spring at the same time, and corresponding potential energy is stored. The control drum assembly is provided with a plane spiral spring, which is used for eliminating the transmission idle stroke problem of a transmission chain caused by gear engagement, key slot matching and the like, and is also used as reset power during accident shutdown. The driving mechanism adopts an interactive operation mode with two motors, one motor is driven by the intermediate gear when running, and the other motor is used as a load to follow up. In an accident state, after the electromagnetic clutch receives an accident protection signal, the electromagnetic clutch is powered off and separated, the spring release mechanism is separated from the speed reducer and the stepping motor, the potential energy of the spring is released, the output shaft is driven to rapidly rotate to the 0 position, the actuating mechanism is driven to reset within 1s, and emergency shutdown is achieved.
The photoelectric encoder has the main working principle of photoelectric conversion, and is a sensor for converting mechanical geometric displacement of an output shaft into pulse or digital quantity through the photoelectric conversion. And a photoelectric encoder is arranged at the tail end of the control drum assembly and used for testing the actual rotation angle of the control drum assembly. The angular displacement sensor is a magnetic resistance type angular displacement sensor which changes the measurement of the angle variation into the measurement of the induced electromotive force variation, is arranged at the joint of the driving mechanism and the transmission mechanism and is used for measuring the actual rotating angle of the driving mechanism. The angle measured by the photoelectric encoder is compared with the angle measured by the angular displacement sensor, so that the angle difference between the power output end and the passive rotating end of the control drum system can be obtained, the angle difference is mainly caused by gear clearance, a transmission shaft and the like and installation, and the problem in structural design can be found and corrected according to mutual verification between the two measured angles.
Under the reactor accident condition, in order to meet the fail-safe principle, the electromagnetic clutch in the driving mechanism is powered off, and the control drum assembly is quickly reset in the specified time under the action of the release spring and the volute spiral spring, so that the reactor shutdown is realized. It is therefore necessary to perform experimental verification of the power-off quick-reset feature of the control drum system to verify the reliability, validity, and safety features inherent in the control drum assembly.
The quick power-off reset characteristic mainly examines the electromechanical delay time and the total mechanical reset time, and the quick reset is an important performance examination index of a control drum system test prototype stage. The comprehensive test platform is different from the power regulation system of actual engineering, and the test and record time is the sum of electromechanical delay time and mechanical quick reset time. The rapid homing time measured by the comprehensive test platform is the time counted from the time when the instruction is sent, and the ending time is the time when the judgment mechanism is parked.
The comprehensive test platform can be referred to as a comprehensive test platform for a drum rod system in Chinese patent application 201911230705.1, and is used for controlling tests of the drum system, such as normal temperature, high temperature, shock resistance and the like, and mainly has three functions: drive to the mechanism, parameter measurement and temperature control. The comprehensive test platform can control and record parameters such as running time, a rotating angle, running speed, current/voltage of electrical equipment, internal temperature of a driving mechanism, temperature of other components of a system and the like in the test process. The comprehensive test platform is realized by connecting a system PCI bus with a DAQ card on the basis of adopting a Windows platform industrial control computer, functions which cannot be realized or are inconvenient to realize by the PCI bus DAQ are realized by using a PCI-RS485 adapter card through an RS485 bus DAQ, and each functional module is realized by selecting a finished product industrial module and a board card. The software is based on VC6.0 development environment, and the MFC platform in the environment is adopted for design and development. The comprehensive test platform interface can realize the functions of interface display, multi-window display, operation control, fault processing, data query and the like.
The reset test principle of the control drum system is as follows: when the comprehensive test platform sends a mechanism reset instruction, software records the current system time t1，t1That is, the time for controlling the drum to start resetting, when the software detects that the difference between the rotation value of the mechanism and the target value input in the software is less than a certain fixed value, the mechanism is considered to be reset, and the current system time t is recorded2Then the difference of two times (t)2-t1) Is the reset time of the control drum system.
Specifically, the actual rotation angle of the driving mechanism is measured by an angular displacement sensor arranged at the joint of the driving mechanism and the transmission mechanism, and when the system sends a mechanism resetting instruction, the software records the current system time t1When detecting that the difference value between the rotation value measured by the angular displacement sensor and the target value set in the system software is less than a first threshold value, recording the current system time t2Difference of two times (t)2-t1) I.e. the reset time of the control drum system, the first threshold value may be chosen between greater than 0 deg. and equal to or less than 1.5 deg..
Meanwhile, as an auxiliary measuring and verifying mode, the actual rotation angle of the control drum assembly is measured through a photoelectric encoder arranged on the control drum assembly of the control rod driving mechanism, and when the difference value between the optical coding value measured by the photoelectric encoder and the target value set by the system software is detected to be smaller than a second threshold value, the current system time t is recorded3Difference of two times (t)3-t1) The second threshold value may be selected between greater than 0 ° and 1.5 ° or less as a check on the reset time of the control drum system。
Generally, if (t)3-t1) And (t)2-t1) The difference between the two is within 80ms, and the measurement of the reset time of the control drum system is considered to be reasonable and accurate.
When the comprehensive test platform executes reset operation, a rotary variable value measured by the angular displacement sensor is obtained through the rotary variable processor, an optical coding value measured by the photoelectric encoder is obtained through the optical coding acquisition board card, data are transmitted to measurement and control software to be processed, and the acquisition frequency of the rotary variable value and the optical coding value of the mechanism is 20 ms. Each driving mechanism occupies 1 serial port, and the transmission rate of the rotary transformer processor to the serial port cache region is 0.05 ms. The transmission speed of the optical encoding acquisition board card is 5 Mpps. A fast reset time test diagram is shown in fig. 2.
As a specific example, the flow of the reset test of the control drum system is shown in fig. 1. While sending the reset instruction, recording the system time t1Then collecting the optical coding value and the rotation value of the system for judgment, when the difference between the rotation value and the target value set by the system is less than 1.5 degrees (far less than the design requirement), considering that the control drum system is returned, and recording the current system time t2Then the difference of the two system times (t)2-t1) Is the reset time of the control drum system. When the difference between the optical coding value and the target value set by the system is less than 1.5 degrees, the optical coding reset of the control drum system is considered, and the current system time t is recorded3Then the difference of the two system times (t)3-t1) Is the reset time of the optical code. The reset time of the optical coding can be used for checking the reset time of the control drum system, and can also be used as a substitute measurement mode for the reset time of the control drum system when the angular displacement sensor is in fault.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims (5)
1. A method for measuring rod drop time of a control rod driving mechanism comprises the steps that after the driving mechanism receives a rotation control signal, a stepping motor rotates to transmit rotation to an output shaft, the output shaft drives an external load to rotate, control over an execution mechanism of a control drum system is achieved, and then reactor power is adjusted; under the reactor accident condition, the electromagnetic clutch in the driving mechanism is powered off, and the control drum system is quickly reset to realize reactor shutdown; the method is characterized in that the actual rotation angle of the driving mechanism is measured by an angular displacement sensor arranged at the joint of the driving mechanism and the transmission mechanism, and when the system sends a mechanism reset instruction, the current system time t is recorded1When detecting that the difference value between the rotation value measured by the angular displacement sensor and the target value set by the system is smaller than a first threshold value, recording the current system time t2Difference of two times (t)2－t1) The control drum system reset time is used as the rod drop time of the control rod drive mechanism.
2. The crdm drop time measurement method as set forth in claim 1, wherein the actual rotation angle of the drum assembly is measured by a photoelectric encoder mounted on the drum assembly of the crdm, and when the system issues a mechanism reset command, the current system time t is recorded1When detecting that the difference value between the optical coding value measured by the photoelectric encoder and the target value set by the system is less than a second threshold value, recording the current system time t3Difference of two times (t)3－t1) As a check on the drop time of the control rod drive mechanism.
3. The method as claimed in claim 2, wherein the rotation value measured by the angular displacement sensor is obtained by a rotation processor of the integrated test platform, the optical encoding value measured by the optical encoder is obtained by the optical encoding collection board, and the data is transmitted to the measurement and control software for processing.
4. The method as set forth in claim 3, wherein the collection frequency of the integrated test platform for the rotation and the optical encoding values is 20 ms.
5. The method as set forth in claim 2, wherein the first threshold value is 0 to 1.5 ° and the second threshold value is 0 to 1.5 °.
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| CN202010304973.XA CN111599499B (en) | 2020-04-17 | 2020-04-17 | Method for measuring rod drop time of control rod driving mechanism |
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| CN112102977A (en) * | 2020-09-04 | 2020-12-18 | 兰州空间技术物理研究所 | Nuclear reactor safety rod performance test system |
| CN112599263B (en) * | 2020-12-05 | 2023-02-14 | 核电运行研究(上海)有限公司 | Method for measuring rod drop time of control rod without cutting off excitation power supply |
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| CN104332195A (en) * | 2013-07-22 | 2015-02-04 | 中国核动力研究设计院 | Method for measuring reactor control rod drop time |
| CN109585041A (en) * | 2018-12-29 | 2019-04-05 | 中国原子能科学研究院 | A kind of reactor capability is adjusted and shutdown control rod drive mechanism |
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| WO2017222614A2 (en) * | 2016-03-14 | 2017-12-28 | Ultra Safe Nuclear Corporation | Passive reactivity control of nuclear thermal propulsion reactors |
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| CN104332195A (en) * | 2013-07-22 | 2015-02-04 | 中国核动力研究设计院 | Method for measuring reactor control rod drop time |
| CN109585041A (en) * | 2018-12-29 | 2019-04-05 | 中国原子能科学研究院 | A kind of reactor capability is adjusted and shutdown control rod drive mechanism |
Non-Patent Citations (2)
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| Development of control system for SNAP reactors;O.P.Steele et al.;《IEEE TRANSACTION ON NUCLEAR SCIENCE》;19661231;第206-223页 * |
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