A control rod drive system based on coolant pump vibration detection

Abstract

The present invention discloses a control rod drive system based on coolant pump vibration detection, comprising a coolant pump circuit vibration detection device, a vibration analysis module, a control rod drive device, a drive analysis module, and a control rod detection device. The coolant pump circuit vibration detection device measures vibration data of the coolant pump circuit. The vibration analysis module extracts data reflecting the nuclear reactor strength from the vibration data and processes it into an intensity index. The control rod detection device measures correlation data between the control rod and the reaction center. The drive analysis module analyzes the control rod operation amount based on the intensity index and correlation data. The control rod drive device controls the control rod according to the operation amount. This invention ensures that the subsequent nuclear reaction intensity and control rod control amount obtained are sufficiently accurate.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear power control, and in particular relates to a control rod drive system based on coolant pump vibration detection. Background Art

[0002] The control rods are made of materials such as boron and cadmium that are easy to absorb neutrons. There is a mechanical device outside the nuclear reaction pressure vessel to operate the control rods. When the control rods are fully inserted into the reaction center, they can absorb a large number of neutrons to prevent the fission chain reaction. If the control rods are pulled out a little, the reactor starts to run and the speed of the chain reaction reaches a certain stable value; if you want to increase the energy released by the reactor, just pull the control rods out a little more, so that the number of neutrons absorbed is reduced and more neutrons participate in the fission reaction.

[0003] Prior art systems disclosed in publications KR100287327B1, KR101807638B1, and KR1020170119090A include a control rod drive coil L, one end of which is connected to the emitter of IGBT Q1 and the cathode of diode D1, and the other end to the collector of IGBT Q2 and the anode of diode D2. The collector of IGBT Q1 and the cathode of diode D2 are both connected to the positive power supply, while the emitter of IGBT Q2 and the anode of diode D1 are both connected to the negative power supply. A PWM generator is connected to the gates of IGBT Q1 and Q2. A CPU is connected to the control rod drive coil L via a current acquisition module, and the CPU is connected to the PWM generator via a control module. However, this system cannot accurately obtain information on the intensity of the nuclear reaction, resulting in inaccurate control of the nuclear reactor by the control rods. Summary of the Invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, the object of the present invention is to provide a control rod drive system based on coolant pump vibration detection, so that the subsequently obtained nuclear reaction intensity and control rod control amount are sufficiently accurate.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A control rod drive system based on coolant pump vibration detection includes a coolant pump circuit vibration detection device, a vibration analysis module, a control rod drive device, a drive analysis module, and a control rod detection device. The coolant pump circuit vibration detection device is used to measure vibration data of the coolant pump circuit. The vibration analysis module extracts data that can reflect the strength of the nuclear reactor from the vibration data and processes it into an intensity index. The control rod detection device is used to measure correlation data between the control rod and the reaction center. The drive analysis module analyzes the control rod operation amount based on the intensity index and the correlation data. The control rod drive device controls the control rod according to the operation amount.

[0007] The coolant pump circuit vibration detection device includes an optical pulse generator, an optical receiver and a time synchronization module. The plane vibration function is obtained by changing the position of the light pulse emitted by the optical pulse generator and received by the optical receiver. The vertical vibration function L is obtained by the time variation of the light pulse received by the light receiver. z (t), the time synchronization module is used to synchronize the time of the timing modules on the optical receiver and the optical pulse generator.

[0008] The optical receiver is provided with a plurality of pulse receiving units, which are closely arranged in a square form. The side length of the square is the spot diameter of the light pulse. The pulse receiving unit that can completely receive the light pulse when not vibrating is the coordinate unit, and the pulse receiving unit that receives the largest light flux of the light pulse when vibrating is the reference unit.

[0009] The light fluxes received by the pulse receiving unit are I1, I2, I3 and I4 in the order of upper left, upper right, lower left and lower right respectively. Then the distance between the light pulse and the coordinate unit is:

[0010]

[0011] Where i is the subscript of the light flux received by the reference unit, n x is the lateral displacement between the reference unit and the coordinate unit, n y is the longitudinal displacement between the reference unit and the coordinate unit, is the transverse unit vector, is the longitudinal unit vector.

[0012] The vibration analysis module obtains the vibration period T and plane amplitude A of the coolant pump system by analyzing the peak value and corresponding time, valley value and corresponding time in the plane vibration function and vertical vibration function. p and vertical amplitude A c .

[0013] The vibration analysis module removes the system vibration from the original vibration function to obtain the vibration function generated by the nuclear reactor:

[0014] Planar vibration:

[0015] Vertical Vibration:

[0016] in, is the initial phase, obtained through actual detection;

[0017] The vibration analysis module calculates the strength index function B(t) of the nuclear reactor:

[0018]

[0019] The drive analysis module calculates the control amount Δd using the following formula, and the control rod drive device controls the control rod according to the control amount Δd;

[0020]

[0021] Among them, B 标 is the intensity threshold value obtained in actual testing, d is the insertion amount of the control rod detected by the control rod detection device, N is the neutron absorption amount detected by the control rod detection device, and ΔN is the change in 1 second.

[0022] A control rod drive system based on coolant pump vibration detection is provided for use in a computer readable storage medium.

[0023] Beneficial effects of the present invention:

[0024] The present invention utilizes an optical instrument to perform vibration detection on the coolant pump circuit. The detection point is an optimal balance point that is both in an environment conducive to the operation of the detection equipment and closest to the reactor where valid data can be obtained. At the same time, the optical instrument can detect all-round vibration in the plane and vertical directions, so that the subsequently obtained nuclear reaction intensity and control rod control amount are sufficiently accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the overall structural framework.

[0026] Figure 2 Schematic diagram of the control rod control process.

[0027] Figure 3 This is a measurement diagram of the pulse receiving unit.

[0028] Figure 4 Schematic diagram of vibration image extraction for the coolant pump circuit system.

[0029] Figure 5 Schematic diagram of the reactor strength control effect. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings.

[0031] Example 1:

[0032] A control rod drive system based on coolant pump vibration detection includes a coolant pump circuit vibration detection device, a vibration analysis module, a control rod drive device, a drive analysis module, and a control rod detection device. The coolant pump circuit vibration detection device is used to measure vibration data of the coolant pump circuit. The vibration analysis module extracts data reflecting the strength of the nuclear reactor from the vibration data and processes it into a strength index. The control rod detection device is used to measure correlation data between the control rod and the reaction center. The drive analysis module analyzes the control rod operation amount based on the strength index and the correlation data. The control rod drive device controls the control rod according to the operation amount.

[0033] The coolant pump circuit vibration detection device includes an optical pulse generator, an optical receiver and a time synchronization module. The plane vibration function is obtained by changing the position of the light pulse emitted by the optical pulse generator and received by the optical receiver. The vertical vibration function L is obtained by the time variation of the light pulse received by the light receiver. z (t), the time synchronization module is used to synchronize the timing modules on the optical receiver and the optical pulse generator;

[0034] The optical receiver is provided with a plurality of pulse receiving units, which are closely arranged in a square form. The side length of the square is the spot diameter of the light pulse. The pulse receiving unit that can completely receive the light pulse when not vibrating is used as the coordinate unit, and the pulse receiving unit that receives the largest light flux of the light pulse when vibrating is used as the reference unit.

[0035] The light fluxes received by the pulse receiving unit are I1, I2, I3 and I4 in the order of upper left, upper right, lower left and lower right respectively. Then the distance between the light pulse and the coordinate unit is:

[0036]

[0037] Where i is the subscript of the light flux received by the reference unit, n x is the lateral displacement between the reference unit and the coordinate unit, n y is the longitudinal displacement between the reference unit and the coordinate unit, is the transverse unit vector, is the longitudinal unit vector;

[0038] The vibration analysis module obtains the vibration period T and plane amplitude A of the coolant pump system by analyzing the peak value and corresponding time, valley value and corresponding time in the plane vibration function and vertical vibration function. p and vertical amplitude A c ;

[0039] The vibration analysis module removes the system vibration from the original vibration function to obtain the vibration function generated by the nuclear reactor:

[0040] Planar vibration:

[0041] Vertical Vibration:

[0042] in, is the initial phase, obtained through actual detection;

[0043] The vibration analysis module calculates the strength index function B(t) of the nuclear reactor:

[0044]

[0045] The drive analysis module calculates the control amount Δd using the following formula, and the control rod drive device controls the control rod according to the control amount Δd;

[0046]

[0047] Among them, B 标 is the intensity threshold value obtained in actual testing, d is the insertion amount of the control rod detected by the control rod detection device, N is the neutron absorption amount detected by the control rod detection device, and ΔN is the change in 1 second;

[0048] A computer-readable storage medium includes a control rod drive system program based on coolant pump vibration detection. When the control rod drive system program based on coolant pump vibration detection is executed by a processor, the steps of a control rod drive system based on coolant pump vibration detection are implemented.

[0049] Example 2:

[0050] A control rod drive system based on coolant pump vibration detection includes a coolant pump circuit vibration detection device, a vibration analysis module, a control rod drive device, a drive analysis module, and a control rod detection device. The coolant pump circuit vibration detection device is used to measure vibration data of the coolant pump circuit. The vibration analysis module extracts data reflecting the strength of the nuclear reactor from the vibration data and processes it into a strength index. The control rod detection device is used to measure correlation data between the control rod and the reaction center. The drive analysis module analyzes the control rod operation amount based on the strength index and the correlation data. The control rod drive device controls the control rod according to the operation amount.

[0051] The coolant pump circuit vibration detection device includes an optical pulse generator, an optical receiver and a time synchronization module. The plane vibration function is obtained by changing the position of the light pulse emitted by the optical pulse generator and received by the optical receiver. The vertical vibration function L is obtained by the time variation of the light pulse received by the light receiver. z (t), the time synchronization module is used to synchronize the timing modules on the optical receiver and the optical pulse generator;

[0052] The optical receiver is provided with a plurality of pulse receiving units, which are closely arranged in a square form. The side length of the square is the spot diameter of the light pulse. The pulse receiving unit that can completely receive the light pulse when not vibrating is used as the coordinate unit, and the pulse receiving unit that receives the largest light flux of the light pulse when vibrating is used as the reference unit.

[0053] The light fluxes received by the pulse receiving unit are I1, I2, I3 and I4 in the order of upper left, upper right, lower left and lower right respectively. Then the distance between the light pulse and the coordinate unit is:

[0054]

[0055] Where i is the subscript of the light flux received by the reference unit, n x is the lateral displacement between the reference unit and the coordinate unit, n y is the longitudinal displacement between the reference unit and the coordinate unit, is the transverse unit vector, is the longitudinal unit vector;

[0056] The vibration analysis module obtains the vibration period T and plane amplitude A of the coolant pump system by analyzing the peak value and corresponding time, valley value and corresponding time in the plane vibration function and vertical vibration function. p and vertical amplitude A c ;

[0057] The vibration analysis module removes the system vibration from the original vibration function to obtain the vibration function generated by the nuclear reactor:

[0058] Planar vibration:

[0059] Vertical Vibration:

[0060] in, is the initial phase, obtained through actual detection;

[0061] The vibration analysis module calculates the strength index function B(t) of the nuclear reactor:

[0062]

[0063] The drive analysis module calculates the control amount Δd using the following formula, and the control rod drive device controls the control rod according to the control amount Δd;

[0064]

[0065] Among them, B 标 is the intensity threshold value obtained in actual testing, d is the insertion amount of the control rod detected by the control rod detection device, N is the neutron absorption amount detected by the control rod detection device, and ΔN is the change in 1 second;

[0066] A computer-readable storage medium, characterized in that the computer-readable storage medium includes a control rod drive system program based on coolant pump vibration detection, and when the control rod drive system program based on coolant pump vibration detection is executed by a processor, the steps of a control rod drive system based on coolant pump vibration detection are implemented;

[0067] Based on this, a control rod drive system based on coolant pump vibration detection is designed, comprising a coolant pump circuit vibration detection device, a vibration analysis module, a control rod drive device, a drive analysis module, and a control rod detection device. The coolant pump circuit vibration detection device is used to measure vibration data of the coolant pump circuit. The vibration analysis module extracts data reflecting the strength of the nuclear reactor from the vibration data and processes it into a strength index. The control rod detection device is used to measure correlation data between the control rod and the reaction center. The drive analysis module analyzes the control rod operation amount based on the strength index and the correlation data. The control rod drive device controls the control rod according to the operation amount.

[0068] The coolant pump circuit vibration detection device includes an optical pulse generator, an optical receiver and a time synchronization module. The optical pulse generator is installed outside the coolant pump circuit and is used to regularly transmit light pulses to the optical receiver. The optical receiver is provided with a plurality of pulse receiving units, one of which can receive the light pulse transmitted by the optical pulse generator. The vibration of the coolant pump circuit in the xy horizontal plane can be calculated based on the position change of the pulse receiving unit. The vibration of the coolant pump circuit in the z direction can be calculated based on the time when the optical receiver receives the light pulse and the time difference between the time when the optical pulse generator transmits the light pulse. The optical pulse generator and the optical receiver are both provided with a timing module. The time synchronization module performs real-time calibration and synchronization on the timing module so that there is no systematic error in the vibration calculation in the z direction.

[0069] The pulse receiving unit has a square structure, and the gaps between adjacent pulse receiving units are small enough to be ignored. The diameter of the light pulse emitted by the optical pulse generator is the diameter of the inscribed circle of the pulse receiving unit. When the cooler pump circuit is not vibrating, the light pulse is directly incident on the center of a pulse receiving unit, and the pulse receiving unit serves as a coordinate unit. Generally, the light pulse will be received by four adjacent pulse receiving units. These four pulse receiving units are named the first unit, the second unit, the third unit, and the fourth unit in the order of the upper left corner, the upper right corner, the lower left corner, and the lower right corner, and the received light fluxes are I1, I2, I3, and I4, respectively. The pulse receiving unit that receives the largest light flux serves as the reference unit.

[0070] The i-th unit is the reference unit, and the distance between the center of the light pulse and the center of the reference unit is for:

[0071]

[0072] in, The direction of the vector is the positive direction of the x-axis, and the length is the side length of the receiving unit. The direction of the vector is the positive direction of the y-axis, and the length is the side length of the receiving unit;

[0073] The distance between the reference unit and the coordinate unit for:

[0074]

[0075] Among them, n x The absolute value of n is the number of pulse receiving units that differs between the reference unit and the coordinate unit in the x-axis direction, y The absolute value of n is the number of pulse receiving units that differs between the reference unit and the coordinate unit in the y-axis direction,x 、n y The sign of is determined by the position of the reference unit in the coordinate unit;

[0076] The distance between the center of the light pulse and the center of the coordinate unit Its relationship with time t is the plane vibration function

[0077] The optical pulse generator emits a light pulse every time t1, and the pulse receiving unit receives the light pulse at time kt1+Δt, where k is a positive integer. Since the distance between the optical pulse generator and the pulse receiving unit is too short, Δt cannot be accurately detected. Therefore, in actual operation, the light pulse is reflected n times between the optical pulse generator and the pulse receiving unit before being received and detected. At this time, the accumulated Δt is large enough to be detected by the timing module. The distance L between the optical pulse generator and the pulse receiving unit is:

[0078] Where c is the speed of light;

[0079] When the cooler pump circuit is not vibrating, the distance between the optical pulse generator and the pulse receiving unit is the standard value. The vibration distance of the cooler pump circuit in the z-axis direction is Its relationship with time is the vertical vibration function L z (t).

[0080] Example 3:

[0081] A control rod drive system based on coolant pump vibration detection includes a coolant pump circuit vibration detection device, a vibration analysis module, a control rod drive device, a drive analysis module, and a control rod detection device. The coolant pump circuit vibration detection device is used to measure vibration data of the coolant pump circuit. The vibration analysis module extracts data reflecting the strength of the nuclear reactor from the vibration data and processes it into a strength index. The control rod detection device is used to measure correlation data between the control rod and the reaction center. The drive analysis module analyzes the control rod operation amount based on the strength index and the correlation data. The control rod drive device controls the control rod according to the operation amount.

[0082] The coolant pump circuit vibration detection device includes an optical pulse generator, an optical receiver and a time synchronization module, and a plane vibration function is obtained by changing the position of the light pulse emitted by the optical pulse generator and received by the optical receiver. The vertical vibration function L is obtained by the time variation of the light pulse received by the light receiver. z(t), the time synchronization module is used to synchronize the timing modules on the optical receiver and the optical pulse generator;

[0083] The optical receiver is provided with a plurality of pulse receiving units, which are closely arranged in a square form. The side length of the square is the spot diameter of the light pulse. The pulse receiving unit that can completely receive the light pulse when not vibrating is used as the coordinate unit, and the pulse receiving unit that receives the largest light flux of the light pulse when vibrating is used as the reference unit.

[0084] The light fluxes received by the pulse receiving unit are I1, I2, I3 and I4 in the order of upper left, upper right, lower left and lower right respectively. Then the distance between the light pulse and the coordinate unit is:

[0085]

[0086] Where i is the subscript of the light flux received by the reference unit, n x is the lateral displacement between the reference unit and the coordinate unit, n y is the longitudinal displacement between the reference unit and the coordinate unit, is the transverse unit vector, is the longitudinal unit vector;

[0087] The vibration analysis module obtains the vibration period T and plane amplitude A of the coolant pump system by analyzing the peak value and corresponding time, valley value and corresponding time in the plane vibration function and vertical vibration function. p and vertical amplitude A c ;

[0088] The vibration analysis module removes the system vibration from the original vibration function to obtain the vibration function generated by the nuclear reactor:

[0089] Planar vibration:

[0090] Vertical Vibration:

[0091] in, is the initial phase, obtained through actual detection;

[0092] The vibration analysis module calculates the strength index function B(t) of the nuclear reactor:

[0093]

[0094] The drive analysis module calculates the control amount Δd using the following formula, and the control rod drive device controls the control rod according to the control amount Δd;

[0095]

[0096] Among them, B 标 is the intensity threshold value obtained in actual testing, d is the insertion amount of the control rod detected by the control rod detection device, N is the neutron absorption amount detected by the control rod detection device, and ΔN is the change in 1 second;

[0097] A computer-readable storage medium, characterized in that the computer-readable storage medium includes a control rod drive system program based on coolant pump vibration detection, and when the control rod drive system program based on coolant pump vibration detection is executed by a processor, the steps of a control rod drive system based on coolant pump vibration detection are implemented;

[0098] Based on this, a control rod drive system based on coolant pump vibration detection is designed, comprising a coolant pump circuit vibration detection device, a vibration analysis module, a control rod drive device, a drive analysis module, and a control rod detection device. The coolant pump circuit vibration detection device is used to measure vibration data of the coolant pump circuit. The vibration analysis module extracts data reflecting the strength of the nuclear reactor from the vibration data and processes it into a strength index. The control rod detection device is used to measure correlation data between the control rod and the reaction center. The drive analysis module analyzes the control rod operation amount based on the strength index and the correlation data. The control rod drive device controls the control rod according to the operation amount.

[0099] The coolant pump circuit vibration detection device includes an optical pulse generator, an optical receiver and a time synchronization module. The optical pulse generator is installed outside the coolant pump circuit and is used to regularly transmit light pulses to the optical receiver. The optical receiver is provided with a plurality of pulse receiving units, one of which can receive the light pulse transmitted by the optical pulse generator. The vibration of the coolant pump circuit in the xy horizontal plane can be calculated based on the position change of the pulse receiving unit. The vibration of the coolant pump circuit in the z direction can be calculated based on the time when the optical receiver receives the light pulse and the time difference between the time when the optical pulse generator transmits the light pulse. The optical pulse generator and the optical receiver are both provided with a timing module. The time synchronization module performs real-time calibration and synchronization on the timing module so that there is no systematic error in the vibration calculation in the z direction.

[0100] The pulse receiving unit has a square structure, and the gaps between adjacent pulse receiving units are small enough to be ignored. The diameter of the light pulse emitted by the optical pulse generator is the diameter of the inscribed circle of the pulse receiving unit. When the cooler pump circuit is not vibrating, the light pulse is directly incident on the center of a pulse receiving unit, and the pulse receiving unit serves as a coordinate unit. Generally, the light pulse will be received by four adjacent pulse receiving units. These four pulse receiving units are named the first unit, the second unit, the third unit, and the fourth unit in the order of the upper left corner, the upper right corner, the lower left corner, and the lower right corner, and the received light fluxes are I1, I2, I3, and I4, respectively. The pulse receiving unit that receives the largest light flux serves as the reference unit.

[0101] The i-th unit is the reference unit, and the distance between the center of the light pulse and the center of the reference unit is for:

[0102]

[0103] in, The direction of the vector is the positive direction of the x-axis, and the length is the side length of the receiving unit. The direction of the vector is the positive direction of the y-axis, and the length is the side length of the receiving unit;

[0104] The distance between the reference unit and the coordinate unit for:

[0105]

[0106] Among them, n x The absolute value of n is the number of pulse receiving units that differs between the reference unit and the coordinate unit in the x-axis direction, y The absolute value of n is the number of pulse receiving units that differs between the reference unit and the coordinate unit in the y-axis direction, x 、n y The sign of is determined by the position of the reference unit in the coordinate unit;

[0107] The distance between the center of the light pulse and the center of the coordinate unit Its relationship with time t is the plane vibration function

[0108] The optical pulse generator emits a light pulse every time t1, and the pulse receiving unit receives the light pulse at time kt1+Δt, where k is a positive integer. Since the distance between the optical pulse generator and the pulse receiving unit is too short, Δt cannot be accurately detected. Therefore, in actual operation, the light pulse is reflected n times between the optical pulse generator and the pulse receiving unit before being received and detected. At this time, the accumulated Δt is large enough to be detected by the timing module. The distance L between the optical pulse generator and the pulse receiving unit is:

[0109] Where c is the speed of light;

[0110] When the cooler pump circuit is not vibrating, the distance between the optical pulse generator and the pulse receiving unit is the standard value. The vibration distance of the cooler pump circuit in the z-axis direction is Its relationship with time is the vertical vibration function L z (t);

[0111] The vibration analysis module analyzes the above-mentioned plane vibration function and vertical vibration function L z (t) Analysis shows that the planar vibration and the vertical vibration are both the superposition of the vibration of the coolant pump system and the vibration generated by the nuclear reactor. The present invention adjusts the reaction of the nuclear reactor by analyzing the vibration generated by the nuclear reactor using control rods, so that the nuclear power reaction is always within a stable range. When the coolant pump power remains unchanged, the vibration of the coolant pump system is stable. By filtering out the vibration of the coolant pump system from the detected vibration, the vibration generated by the nuclear reactor can be obtained.

[0112] Select a period of time, extract the peak and valley values ​​of the plane vibration function within the period of time, and form a two-dimensional array {h pi , t pi}, extract the peak and valley values ​​of the vertical vibration function within this period of time, and form another two-dimensional array {h ci , t ci};

[0113] The period T of the vibration of the cooling pump system is:

[0114] Where n is the total number of vertical vibration peaks and valleys during this period;

[0115] The plane vibration amplitude A of the cooling pump system p for:

[0116] Where n is the total number of plane vibration peaks and valleys during this period. If it is an odd number, the last peak or valley is discarded.

[0117] The vertical vibration amplitude A of the cooling pump system c for:

[0118] Where n is the total number of vertical vibration peaks and valleys during the period. If it is an odd number, the last peak or valley is discarded.

[0119] The plane vibration function generated by a nuclear reactor is:

[0120]

[0121] in, is the initial phase, obtained by actual detection;

[0122] The vertical vibration function generated by a nuclear reactor is:

[0123]

[0124] in, is the initial phase, obtained by actual detection.

[0125] Example 4:

[0126] A control rod drive system based on coolant pump vibration detection includes a coolant pump circuit vibration detection device, a vibration analysis module, a control rod drive device, a drive analysis module, and a control rod detection device. The coolant pump circuit vibration detection device is used to measure vibration data of the coolant pump circuit. The vibration analysis module extracts data reflecting the strength of the nuclear reactor from the vibration data and processes it into a strength index. The control rod detection device is used to measure correlation data between the control rod and the reaction center. The drive analysis module analyzes the control rod operation amount based on the strength index and the correlation data. The control rod drive device controls the control rod according to the operation amount.

[0127] The coolant pump circuit vibration detection device includes an optical pulse generator, an optical receiver and a time synchronization module. The plane vibration function is obtained by changing the position of the light pulse emitted by the optical pulse generator and received by the optical receiver. The vertical vibration function L is obtained by the time variation of the light pulse received by the light receiver. z (t), the time synchronization module is used to synchronize the timing modules on the optical receiver and the optical pulse generator;

[0128] The optical receiver is provided with a plurality of pulse receiving units, which are closely arranged in a square form. The side length of the square is the spot diameter of the light pulse. The pulse receiving unit that can completely receive the light pulse when not vibrating is used as the coordinate unit, and the pulse receiving unit that receives the largest light flux of the light pulse when vibrating is used as the reference unit.

[0129] The light fluxes received by the pulse receiving unit are I1, I2, I3 and I4 in the order of upper left, upper right, lower left and lower right respectively. Then the distance between the light pulse and the coordinate unit is:

[0130]

[0131] Where i is the subscript of the light flux received by the reference unit, n x is the lateral displacement between the reference unit and the coordinate unit, n y is the longitudinal displacement between the reference unit and the coordinate unit, is the transverse unit vector, is the longitudinal unit vector;

[0132] The vibration analysis module obtains the vibration period T and plane amplitude A of the coolant pump system by analyzing the peak value and corresponding time, valley value and corresponding time in the plane vibration function and vertical vibration function. p and vertical amplitude A c ;

[0133] The vibration analysis module removes the system vibration from the original vibration function to obtain the vibration function generated by the nuclear reactor:

[0134] Planar vibration:

[0135] Vertical Vibration:

[0136] in, is the initial phase, obtained through actual detection;

[0137] The vibration analysis module calculates the strength index function B(t) of the nuclear reactor:

[0138]

[0139] The drive analysis module calculates the control amount Δd using the following formula, and the control rod drive device controls the control rod according to the control amount Δd;

[0140]

[0141] Among them, B 标is the intensity threshold value obtained in actual testing, d is the insertion amount of the control rod detected by the control rod detection device, N is the neutron absorption amount detected by the control rod detection device, and ΔN is the change in 1 second;

[0142] A computer-readable storage medium comprising a control rod drive system program based on coolant pump vibration detection, wherein when the control rod drive system program based on coolant pump vibration detection is executed by a processor, steps of a control rod drive system based on coolant pump vibration detection are implemented;

[0143] Based on this, a control rod drive system based on coolant pump vibration detection is designed, comprising a coolant pump circuit vibration detection device, a vibration analysis module, a control rod drive device, a drive analysis module, and a control rod detection device. The coolant pump circuit vibration detection device is used to measure vibration data of the coolant pump circuit. The vibration analysis module extracts data reflecting the strength of the nuclear reactor from the vibration data and processes it into a strength index. The control rod detection device is used to measure correlation data between the control rod and the reaction center. The drive analysis module analyzes the control rod operation amount based on the strength index and the correlation data. The control rod drive device controls the control rod according to the operation amount.

[0144] The coolant pump circuit vibration detection device includes an optical pulse generator, an optical receiver and a time synchronization module. The optical pulse generator is installed outside the coolant pump circuit and is used to regularly transmit light pulses to the optical receiver. The optical receiver is provided with a plurality of pulse receiving units, one of which can receive the light pulse transmitted by the optical pulse generator. The vibration of the coolant pump circuit in the xy horizontal plane can be calculated based on the position change of the pulse receiving unit. The vibration of the coolant pump circuit in the z direction can be calculated based on the time when the optical receiver receives the light pulse and the time difference between the time when the optical pulse generator transmits the light pulse. The optical pulse generator and the optical receiver are both provided with a timing module. The time synchronization module performs real-time calibration and synchronization on the timing module so that there is no systematic error in the vibration calculation in the z direction.

[0145] The pulse receiving unit has a square structure, and the gaps between adjacent pulse receiving units are small enough to be ignored. The diameter of the light pulse emitted by the optical pulse generator is the diameter of the inscribed circle of the pulse receiving unit. When the cooler pump circuit is not vibrating, the light pulse is directly incident on the center of a pulse receiving unit, and the pulse receiving unit serves as a coordinate unit. Generally, the light pulse will be received by four adjacent pulse receiving units. These four pulse receiving units are named the first unit, the second unit, the third unit, and the fourth unit in the order of the upper left corner, the upper right corner, the lower left corner, and the lower right corner, and the received light fluxes are I1, I2, I3, and I4, respectively. The pulse receiving unit that receives the largest light flux serves as the reference unit.

[0146] The i-th unit is the reference unit, and the distance between the center of the light pulse and the center of the reference unit is for:

[0147]

[0148] in, The direction of the vector is the positive direction of the x-axis, and the length is the side length of the receiving unit. The direction of the vector is the positive direction of the y-axis, and the length is the side length of the receiving unit;

[0149] The distance between the reference unit and the coordinate unit for:

[0150]

[0151] Among them, n x The absolute value of n is the number of pulse receiving units that differs between the reference unit and the coordinate unit in the x-axis direction, y The absolute value of n is the number of pulse receiving units that differs between the reference unit and the coordinate unit in the y-axis direction, x 、n y The sign of is determined by the position of the reference unit in the coordinate unit;

[0152] The distance between the center of the light pulse and the center of the coordinate unit Its relationship with time t is the plane vibration function

[0153] The optical pulse generator emits a light pulse every time t1, and the pulse receiving unit receives the light pulse at time kt1+Δt, where k is a positive integer. Since the distance between the optical pulse generator and the pulse receiving unit is too short, Δt cannot be accurately detected. Therefore, in actual operation, the light pulse is reflected n times between the optical pulse generator and the pulse receiving unit before being received and detected. At this time, the accumulated Δt is large enough to be detected by the timing module. The distance L between the optical pulse generator and the pulse receiving unit is:

[0154] Where c is the speed of light;

[0155] When the cooler pump circuit is not vibrating, the distance between the optical pulse generator and the pulse receiving unit is the standard value. The vibration distance of the cooler pump circuit in the z-axis direction is Its relationship with time is the vertical vibration function L z (t);

[0156] The vibration analysis module analyzes the above-mentioned plane vibration function and vertical vibration function L z (t) Analysis shows that the planar vibration and the vertical vibration are both the superposition of the vibration of the coolant pump system and the vibration generated by the nuclear reactor. The present invention adjusts the reaction of the nuclear reactor by analyzing the vibration generated by the nuclear reactor using control rods, so that the nuclear power reaction is always within a stable range. When the coolant pump power remains unchanged, the vibration of the coolant pump system is stable. By filtering out the vibration of the coolant pump system from the detected vibration, the vibration generated by the nuclear reactor can be obtained.

[0157] Select a period of time, extract the peak and valley values ​​of the plane vibration function within the period of time, and form a two-dimensional array {h pi , t pi}, extract the peak and valley values ​​of the vertical vibration function within this period of time, and form another two-dimensional array {h ci , t ci};

[0158] The period T of the vibration of the cooling pump system is:

[0159] Where n is the total number of vertical vibration peaks and valleys during this period;

[0160] The plane vibration amplitude A of the cooling pump system p for:

[0161] Where n is the total number of plane vibration peaks and valleys during this period. If it is an odd number, the last peak or valley is discarded.

[0162] The vertical vibration amplitude A of the cooling pump system c for:

[0163] Where n is the total number of vertical vibration peaks and valleys during the period. If it is an odd number, the last peak or valley is discarded.

[0164] The plane vibration function generated by a nuclear reactor is:

[0165] in, is the initial phase, obtained by actual detection;

[0166] The vertical vibration function generated by a nuclear reactor is:

[0167] in, is the initial phase, obtained by actual detection;

[0168] The strength exponential function B(t) of the nuclear reactor is calculated by the above two functions:

[0169]

[0170] The control rod detection device is used to detect the depth d of the control rod inserted into the nuclear reaction center and the amount of neutrons absorbed by the control rod N. The drive analysis module controls the control rod using the control rod drive device according to the changes in d, N and B(t);

[0171]

[0172] Among them, B 标 is the strength threshold obtained in actual testing, Δd is the depth to which the control rod needs to be changed, and ΔN is the change in N within 1 second;

[0173] The control rods are controlled in real time by the control rod driving device, so that the nuclear reactor can operate stably within a controllable range.

Claims

1. A control rod drive system based on coolant pump vibration detection, characterized in that: The system comprises a coolant pump circuit vibration detection device, a vibration analysis module, a control rod drive device, a drive analysis module, and a control rod detection device. The coolant pump circuit vibration detection device is used to measure vibration data of the coolant pump circuit. The vibration analysis module extracts data that can reflect the strength of the nuclear reactor from the vibration data and processes it into a strength index. The control rod detection device is used to measure correlation data between the control rod and the reaction center. The drive analysis module analyzes the control rod operation amount based on the strength index and the correlation data. The control rod drive device controls the control rod based on the operation amount.

2. The control rod drive system based on coolant pump vibration detection according to claim 1, characterized in that: The coolant pump circuit vibration detection device includes an optical pulse generator, an optical receiver and a time synchronization module. The plane vibration function is obtained by changing the position of the light pulse emitted by the optical pulse generator and received by the optical receiver. The vertical vibration function L is obtained by the time variation of the light pulse received by the light receiver. z (t), the time synchronization module is used to synchronize the time of the timing modules on the optical receiver and the optical pulse generator.

3. The control rod drive system based on coolant pump vibration detection according to claim 2, characterized in that: The optical receiver is provided with a plurality of pulse receiving units, which are closely arranged in a square form. The side length of the square is the spot diameter of the light pulse. The pulse receiving unit that can completely receive the light pulse when not vibrating is the coordinate unit, and the pulse receiving unit that receives the largest light flux of the light pulse when vibrating is the reference unit.

4. The control rod drive system based on coolant pump vibration detection according to claim 3, characterized in that: The light fluxes received by the pulse receiving unit are I1, I2, I3 and I4 in the order of upper left, upper right, lower left and lower right respectively. Then the distance between the light pulse and the coordinate unit is: Where i is the subscript of the light flux received by the reference unit, n x is the lateral displacement between the reference unit and the coordinate unit, n y is the longitudinal displacement between the reference unit and the coordinate unit, is the transverse unit vector, is the longitudinal unit vector.

5. The control rod drive system based on coolant pump vibration detection according to claim 2, characterized in that: The vibration analysis module obtains the vibration period T and plane amplitude A of the coolant pump system by analyzing the peak value and corresponding time, valley value and corresponding time in the plane vibration function and vertical vibration function. p and vertical amplitude A c .

6. The control rod drive system based on coolant pump vibration detection according to claim 1, characterized in that: The vibration analysis module removes the system vibration from the original vibration function to obtain the vibration function generated by the nuclear reactor: Planar vibration: Vertical Vibration: in, is the initial phase, obtained through actual detection; The vibration analysis module calculates the strength index function B(t) of the nuclear reactor:

7. The control rod drive system based on coolant pump vibration detection according to claim 1, characterized in that: The drive analysis module calculates the control amount Δd using the following formula, and the control rod drive device controls the control rod according to the control amount Δd; Among them, B 标 is the intensity threshold value obtained in actual testing, d is the insertion amount of the control rod detected by the control rod detection device, N is the neutron absorption amount detected by the control rod detection device, and ΔN is the change in 1 second.

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