JP4481539B2 - Fixed core measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention measures the calorific value of a sensor due to irradiation of radiation generated in a nuclear reactor, and monitors the in-reactor state by measuring the in-core power distribution necessary for gain calibration of a local output system monitor (LPRM). The present invention relates to a fixed in-core measurement device.
[0002]
[Prior art]
As a device for monitoring the reactor power, a plurality of sensors are fixed to the periphery of the reactor, and the calorific value of the sensor due to irradiation of radiation generated in the reactor is measured by these sensors. There is a fixed in-core measurement device that measures the in-core power distribution necessary for gain calibration of the output system monitor (LPRM) to monitor the in-core state.
[0003]
Conventionally, this fixed in-core measuring device fixes a plurality of detectors each containing a thermocouple thermometer and a heating resistor in a vessel made of, for example, stainless steel, A coupler provided in the portion that penetrates the core bottom is connected to the thermocouple thermometer and the heating resistor of each detector via a multi-core cable, and from this coupler to the furnace side via the multi-core cable. It is connected to a penetration provided through the partition wall.
[0004]
The monitoring station has a thermocouple voltage measuring device, a heat generating power supply that supplies power to the heat generating resistor, a power control device that controls the output of the heat generating power supply, and a voltage that measures the output voltage of the heat generating power supply. A current measuring device that measures the output current of the measuring device and the power supply for heat generation is installed, the thermocouple voltage measuring instrument is connected to the penetration via the signal cable, and the heat generation power supply is connected to the penetration via the heater power supply cable Has been.
[0005]
In the fixed in-core measuring device having such a configuration, the calibration of the device itself is performed by applying a voltage from the heating power supply device controlled to output a constant current to the heating resistor for calibration incorporated in the sensor. It is carried out by that.
[0006]
[Problems to be solved by the invention]
However, in such a fixed in-core measurement device, since the environmental conditions in the system change depending on the temperature or the like, there is a problem that the measurement system is affected and the measurement accuracy is lowered.
[0007]
In addition, since a multi-core cable is connected to each detector provided in the furnace via a coupler provided in a narrow portion of the furnace bottom, it is necessary to reduce the size of the coupling as much as possible.
[0008]
Furthermore, in the measurement system, when processing signals from a plurality of detectors arranged in the furnace, reliability for measuring the power distribution in the furnace is required.
[0009]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a fixed in-core measurement device capable of improving the measurement accuracy of the system and the reliability of the entire system.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention constitutes a fixed in-core measuring device by the following means.
[0012]
The invention corresponding to claim 1 supplies a plurality of detectors each having a thermocouple thermometer and a heating resistor disposed in the core, and supplies power to the heating resistors of each detector through a heater power cable. A power supply device for heat generation, a thermocouple voltage measuring device for measuring a temperature value input through the signal cable from a thermocouple thermometer of each detector, and the detector provided on the output side of the power supply device for heat generation Output switching device for switching the output destination of the power source to the heating resistor, output measuring device for measuring the output value of the output switching device, output value measured by the measuring unit of the heating power device and the output measurement The output value of the output switching device measured by the device is compared, and if the difference between these two values is greater than or equal to a preset value, it is determined that either the heat generating power supply device or the output switching device is out of order. And output to that effect And a signal processing device having that fault diagnosis function.
[0015]
Invention, the fixed incore measuring apparatus of the present invention corresponding to claim 1, when the n lines of the detector, measured in m stand thermocouple voltage measurement instrument, thermocouple voltmeter corresponding to claim 2 Detectors to be monitored per unit are evenly arranged in the furnace so as not to concentrate on a part of the core.
[0016]
According to a third aspect of the present invention, there is provided a fixed in-core measuring device according to the first aspect of the present invention, wherein a power supply line between the heating resistor of each detector and the heating power supply unit, The signal line between the thermocouple thermometer of the detector and the thermocouple voltage measuring device is coupled to the input and output terminals of the thermocouple thermometer and the heating resistor of each detector, and this coupling And a separator connected via a multicore cable in which the signal cable and the heater power cable are bundled together, and the signal cable of the multicore cable branched by the separator is connected to the thermocouple voltage measuring instrument. The heater power cable is connected to the heat generating power supply device.
[0017]
According to a fourth aspect of the present invention, in the fixed in-core measurement device according to the third aspect of the present invention, the coupler and the multicore cable are connected by a connection cable.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0019]
FIG. 1 is a system configuration diagram showing a first embodiment of a stationary in-core measuring apparatus according to the present invention.
[0020]
In FIG. 1, reference numeral 103 denotes a plurality of detectors (only one is shown in the figure) arranged and fixed in the core at an appropriate interval, and this detector 103 is provided in the axial direction through the core bottom. A plurality of thermocouple thermometers 101 provided at appropriate intervals in the axial direction and a heating resistor 102 provided along the axial direction are housed in a protective tube made of stainless steel.
[0021]
A coupler 105a is provided at a portion of the detector 103 that penetrates the core bottom, a thermocouple thermometer 101 and a heating resistor 102 are connected to one end of the coupler 105a, and the other end of the coupler 105a is connected to the other end. A separator 105 b is connected via the multicore cable 104.
[0022]
The separator 105b separates the multi-core cable 104 into a signal cable and a heater power cable, and these cables are respectively connected to the inner ends of the penetrations 106 provided through the reactor containment vessel.
[0023]
On the other hand, reference numeral 109 denotes a heat generating power supply device that supplies power to the heat generating resistor. The heat generating power supply device 109 has a current measuring unit and a voltage measuring unit therein, and is controlled by the power supply control unit 112 and outputs its output. Is supplied to an output switching device 111 that switches to a heating resistor as an output destination.
[0024]
A voltage measuring device 113 and a current measuring device 114 are connected to each energization circuit switched by the output switching device 111, respectively. Each of these energization circuits is connected to a penetration 106 on the heater power cable side by a heater power cable 110 via a connector.
[0025]
In addition, a thermocouple voltage measuring device 107 is connected to the penetration 106 on the signal cable side by a signal cable 108 via a connector. The thermocouple voltage measuring device 107 measures a signal from the thermocouple thermometer 101, and the measured value is given to the signal processing device 116.
[0026]
Further, the signal processing device 116 includes environmental data from the environmental data measuring device 115 that measures the temperature in the system, current and voltage measured by the current measuring unit and the voltage measuring unit in the heating power supply device 109, and power control. The current control signal and the voltage control signal output from the device 112 and the voltage and current measurement values of the energization circuit measured by the voltage measurement device 113 and the current measurement device 114 are input.
[0027]
Further, reference numeral 118 denotes an external output device that outputs the result of arithmetic processing by the signal processing device 116 to the outside.
[0028]
As shown in FIG. 2, the signal processing device 116 includes the input unit 21, the thermocouple thermometer value VGT measured by the thermocouple voltage measuring device 107 input from the input unit 21, and the environment data measuring device 115. Data T, currents and voltages I _PS and V _PS measured by the current measurement unit and voltage measurement unit in the power supply device 109 for heat generation, current control signals and voltage control signals I _PSCONTL and V _PSCONTL output from the power supply control device 112 Furthermore, the storage unit 22 for storing the voltage of the energization circuit and the current measurement values V _MON and I _MON measured by the voltage measurement device 113 and the current measurement device 114, respectively, and each data stored in the storage unit 22 are captured. Are provided with a calculation unit 23 that executes the calculation, a determination unit 24 that determines a calculation result of the calculator 23, and an output unit 25 that outputs the determination result of the determination unit 24.
[0029]
Here, detailed functions of the storage unit 22 and the calculation unit 23 will be described with reference to FIGS.
[0030]
Storage unit 22, a memory 121 to write the thermocouple voltage V _GT and the table 120 which relationship is written in the temperature variation T of the thermocouple voltage V _GT, measured by the voltage measuring unit of the heating power supply unit 109 supply voltage V memory 131 to write the table 130 and the power supply voltage V _PS that variation with temperature T is written in _PS, the temperature variation of the measured power supply current I _PS in the current measurement unit of the heating power source unit 109 and the table 140 written supply current memory to write I _PS, the output switching unit 111 of the voltage measuring device 113 memory to write the measured voltage V _MON table 150 and the voltage V _MON temperature variation is written in the current measurement device of the output switching device 111 A table 160 in which the temperature fluctuation amount of the current I _MON measured by 114 is written, a memory 161 in which the current I _MON is written, and a thermocouple voltage V _GT are written. Table 180 in which the temperature fluctuation amount of power P _MON is written from the voltage V _MON measured by the voltage measurement device 113 of the memory 121 and the output switching device 111 and the current I _MON measured by the current measurement device 114 and the power and a memory 181 to write P _MON.
[0031]
The computing unit 23 corrects the voltage or current of each unit written in each memory based on the temperature fluctuation amount written in each table 122, 132, 142, 152, 162, and so on. 182 and a calculation function 170 for comparing the results corrected by these correction calculation functions.
[0032]
In FIG. 4, reference numeral 171 denotes a determination unit that performs failure determination according to the calculation result of the calculation function 170, and corresponds to the determination unit 24 described above.
[0033]
Next, the operation of the fixed in-core measuring apparatus configured as described above will be described.
[0034]
Now, the device temperature measured by the environmental data measuring device 115 stored in the thermocouple voltage recording memory 121 of the storage unit 22 and the thermocouple temperature measurement value V _GT measured by the thermocouple measuring device 107 are input to the computing unit 23. When it is taken in, this calculation unit 23 is obtained from the environmental data T indicating the relationship between the temperature stored in the table 120 in the thermocouple temperature measurement value VGT and the temperature fluctuation amount of the thermocouple voltage by the correction calculation function 122. A correction calculation for adding the temperature fluctuation amount at the current temperature is executed, and the corrected thermocouple voltage is output to the outside via the external output device 118 or the corrected data is returned to the signal processing device 116. Thereby, since the corrected thermocouple voltage at the current temperature can be obtained, the system accuracy can be improved.
[0035]
Then the output current value I _PS measured in heating power source device 109 are housed in the memory 141 of the storage unit 22 is taken to the operation unit 23, housed in the table 140 by the correction calculation function 142 In the calculation unit 23 is executed a correction operation to apply the variation with temperature in the temperature and the power supply current I current temperature obtained from the data T indicating a relationship between temperature variation amounts of _PS have also outputs are housed in the memory 161 switching device When the output current value I _MON measured at 111 is taken into the calculation unit 23, the calculation unit 23 calculates the temperature stored in the table 160 by the correction calculation function 162 and the current I _MON measured by the current measurement device 114. A correction operation for adding the temperature fluctuation amount at the current temperature obtained from the data T indicating the relationship with the temperature fluctuation amount is executed.
[0036]
When the output current value I _PS measured by the corrected thermal power supply device 109 at the current temperature and the output current value I _MON measured by the output switching device 111 are taken into the calculation unit 23, the calculation unit 23 Then, the arithmetic function 170 compares these values to determine the difference between the two values, and if this difference is determined to be greater than or equal to a preset value by the determination unit 24 (determining unit 171 in FIG. 4), It is determined that either the power supply device 109 or the output switching device 111 has failed, and an alarm or the like is output.
[0037]
Further, the environmental current T measured by the environmental data measuring instrument 115 in the system is used to measure the output current value I _PS measured by the heat generating power supply device 109 and the output current value I _MON measured by the output switching device 111. The influence of the conditions is corrected, the correction result is compared with the control value I _PSCONTL of the power supply control device 112, and if the difference between the three values is greater than or equal to a preset value, the heating power supply device 109 or the output switching device 111 It is determined that any one of the power supply control devices 112 has failed, and an alarm or the like is output.
[0038]
Since the above-described failure diagnosis is the same when the output voltage value VPS is used, the description thereof is omitted here.
[0039]
By performing this fault diagnosis for both current / voltage, the reliability of the system can be further improved.
[0040]
In the above description, the case where the output current value I _MON measured by the current measuring device 114 of the output switching device 111 or the output voltage value V _MON measured by the voltage measuring device 113 is corrected by the environmental data T has been described. and heater power P _MON using _MON and output voltage values V _MON, can be corrected by the environmental data T against the heater power P _MON.
[0041]
That is, when the heater power P _MON stored in the memory 181 is taken into the calculation unit 23, the temperature stored in the table 180 by the correction calculation function 182 and the temperature fluctuation amount of the heater power P _{MON in} the calculation unit 23. A correction calculation for adding the temperature fluctuation amount at the current temperature obtained from the data T indicating the relationship between the two is performed. Thereby, the corrected heater power at the current temperature can be obtained.
[0042]
The correction processing can be performed in the same manner as described above not only inside the signal processing device 116 but also using a dedicated processing device provided separately for each function.
[0043]
In the above embodiment, the thermocouple thermometer value measured by the thermocouple voltage measuring device 107 online, the output current / voltage value measured by the heat generating power supply device 109, and the output current / voltage value measured by the output switching device 111 are calculated. Although the case where the influence of the environmental condition is corrected using the environmental data T measured by the environmental data measuring instrument 115 in the system has been described, the same correction effect can be expected even if it is performed offline.
[0044]
In the case of offline processing, the signal processing device 116 outputs the data read from each of the memories 121, 131, 141, 151, 161, 181 to the correction device 117 provided outside, and the temperature variation table 120 is sent to the correction device 117. , 130, 140, 150, 160, and 180 can perform the same temperature correction processing as in the above-described embodiment.
[0045]
By the way, the multi-core cable 104 is connected to the coupler 105a connected to the plurality of detectors 103 at the core bottom. However, since the space existing at the core bottom is very narrow, the coupler 105a needs to be as small as possible. There is. In addition, the same connector housed in the same cable is used for the line of the heat generating power supply 109 and the signal line of the detector 103 used for the calibration of the sensitivity of the detector 103 due to size limitations. Along with the deterioration, there is a concern about sneaking noise from the power supply line for heat generation to the signal line.
[0046]
FIG. 5 is a connection configuration diagram of a coupler and a multi-core cable in the second embodiment of the stationary in-core measurement device according to the present invention.
[0047]
As shown in FIG. 5, the output end of the coupler 105 a connected to the detector 103 and the cable conductor led out from the multicore cable 104 are connected by soldering using a connection cable 301. It is.
[0048]
Thus, the coupler 105a can be reduced in size by soldering and connecting the coupler 105a and the multi-core cable 104 using the connection cable 301.
[0049]
FIG. 6 is a connection configuration diagram showing another example of the coupler and the multi-core cable in the same embodiment.
[0050]
As shown in FIG. 6, the connection between the output end of the coupler 105 a connected to the detector 103 and the cable conductor led out from the multicore cable 104 is connected using a connection cable 301 and a connector 302. To do.
[0051]
Thus, even if the coupler 105a and the multicore cable 104 are connected using the connection cable 301 and the connector 302, the coupler 105a can be reduced in size.
[0052]
FIG. 7 is a diagram showing the arrangement and connection configuration of detectors and thermocouple voltage measuring devices in the third embodiment of the fixed in-core measuring device according to the present invention.
[0053]
As shown in FIG. 7, when n detectors 401 are arranged in the core and these n detectors 103 are measured by m thermocouple voltage measuring devices 107, one thermocouple voltage measuring device is used. The detectors to be monitored in (1) are arranged evenly in the core.
[0054]
By configuring in this way, the detector can be arranged so as not to concentrate on a part of the core, so that the outline of the in-core power distribution can be measured with one thermocouple voltage measuring device.
[0055]
FIG. 8 is a configuration diagram of a multi-core cable in the fourth embodiment of the fixed in-core measurement device according to the present invention.
[0056]
As shown in FIG. 8A, in the multi-core cable 104 in which the heater power cable 110 and the signal cable 108 are collectively, a pair of heater power cables 110 composed of + and ground (GND) are used as shield cables 401, and the shields thereof are used. Is connected to the GND side of the heater power cable.
[0057]
With the multi-core cable having such a configuration, the voltage applied to the heater power supply cable 110 does not reach the signal cable 108 and flows into the GND side, so that noise wraparound can be eliminated.
[0058]
Further, as shown in FIG. 8B, the same effect as described above can be obtained even if the plus side of the pair of heater power cables 110 is a shield cable and the GND side of the heater power cable is connected to the shield. be able to.
[0059]
FIG. 9 is a configuration diagram of a coupler to which a multicore cable is connected in the fifth embodiment of the fixed in-core measurement device according to the present invention.
[0060]
As shown in FIG. 9, in the coupler 105a to which the multi-core cable is connected, a guard ring 501 connected to the GND side of the heater power cable is provided around the contact of the heater power cable 110.
[0061]
Even in such a configuration, the voltage applied to the heater power supply cable flows to the GND side without reaching the signal cable line as in the fourth embodiment, so that noise wraparound can be eliminated.
[0062]
Further, even if contact pins connected to the ground of the heater power cable are arranged around the connector of the heater power cable, the same effect as described above can be obtained.
[0063]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a fixed in-core measurement device capable of improving the measurement accuracy of the system and the reliability of the entire system.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram showing a first embodiment of a stationary in-core measurement apparatus according to the present invention.
FIG. 2 is a block diagram showing an internal configuration of the signal processing apparatus according to the embodiment.
FIG. 3 is a functional explanatory diagram of each unit of the signal processing device according to the embodiment;
4 is a functional explanatory diagram of a portion different from FIG. 3 of the signal processing device. FIG.
FIG. 5 is a connection configuration diagram of a coupler and a multi-core cable in the second embodiment of the stationary in-core measurement device according to the present invention.
FIG. 6 is a connection configuration diagram illustrating another example of the coupler and the multicore cable in the same embodiment;
FIG. 7 is an arrangement and connection configuration diagram of a detector and a thermocouple voltage measuring device in a third embodiment of a fixed in-core measuring device according to the present invention.
FIG. 8 is a configuration diagram of a multi-core cable in a fourth embodiment of a stationary in-core measurement device according to the present invention.
FIG. 9 is a configuration diagram of a multicore cable in a fifth embodiment of the fixed in-core measurement device according to the present invention.
[Explanation of symbols]
21: input unit 22: storage unit 23: calculation unit 24: determination unit 25: output unit 101: thermocouple thermometer 102: heating resistor 103: detector 104: multicore cable 105a: coupler 105b: separator 106 : Penetration 107: Thermocouple voltage measuring instrument 108: Signal cable 109: Heating power supply device 110: Heater power supply cable 111: Output device 112: Power supply control device 113: Voltage measuring device 114: Current measuring device 115: Environmental data measurement 116: Signal processing device 117: Correction device 118: External output device

Claims (4)

A plurality of detectors each having a thermocouple thermometer and a heating resistor arranged in the core, a heating power supply device for supplying power to the heating resistors of each detector through a heater power cable, A thermocouple voltage measuring device for measuring a temperature value inputted through a signal cable from a thermocouple thermometer of the detector, and an output of a power source to a heating resistor of the detector provided on the output side of the heating power supply device An output switching device for switching the destination, an output measuring device for measuring an output value of the output switching device, an output value measured by the measuring section of the heat generating power supply device, and an output of the output switching device measured by the output measuring device A failure diagnosis function that compares values and determines that either the heat generating power supply device or the output switching device is out of order when the difference between the two values is greater than or equal to a preset value Signal processing Fixed in-core measuring apparatus characterized by comprising a device. The fixed in-core measurement device according to claim 1, wherein when n detectors are measured by m thermocouple voltage measuring devices, the detector to be monitored per thermocouple voltage measuring device is in the furnace. A fixed in-core measuring device, which is arranged evenly and does not concentrate on a part of the core. The fixed in-core measuring device according to claim 1 , wherein a power supply line between the heating resistor of each detector and the heating power supply device, and a thermocouple thermometer and the thermocouple voltage of each detector. The signal line to the measuring device includes a coupler coupled to the input / output terminals of the thermocouple thermometer and the heating resistor of each detector, and a multiplicity of signal cables and heater power cables connected to the coupler. A separator connected via a core cable, the signal cable of the multi-core cable branched by the separator is connected to the thermocouple voltage measuring device, and the heater power cable is connected to the heating power supply device A fixed in-core measuring device characterized by being connected. 4. The fixed in-core measurement device according to claim 3 , wherein the coupler and the multi-core cable are connected using a connection cable.

Images