JPH0511278B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a drive control device for a traveling incore probe (hereinafter referred to as TIP), which is one of the nuclear instrumentation systems in a nuclear reactor in a boiling water nuclear power plant. [Technical background of the invention and its problems] TIP measures the amount of neutrons by moving a detector in the axial direction of the reactor during operation, and obtains the reactor power distribution at each height in the axial direction of the reactor. This provides basic data for calculating reactor power distribution. Detectors that measure the amount of neutrons generally have the characteristic that their sensitivity attenuates when exposed to neutron irradiation.
Similarly, the sensitivity of TIP's detector also decreases due to neutron irradiation. Therefore, when TIP is not measuring the amount of neutrons, the detector is placed in a cool container outside the reactor, and only when measurements are being taken, the detector is inserted from the top of the reactor core toward the bottom of the reactor core, and moved when withdrawn. Data in the reactor axis direction is obtained by generating a pulse signal corresponding to the distance and reading the detector signal in synchronization with the pulse signal. Once data reading is complete, the detector is stored in a sealed container outside the reactor to minimize neutron irradiation and prevent detector sensitivity from decreasing. On the other hand, a local power monitoring device (LocaI) is installed inside the reactor to measure the amount of neutrons inside the reactor during operation.
Power Range Monitor (hereinafter referred to as LPRM)
is fixedly placed. The detection signal of TIP is this
It is also used to compensate for sensitivity degradation caused by neutron irradiation in the LPRM detector. A conventional drive control device for this TIP will be explained with reference to the drawings. FIG. 4 is a block diagram of a conventional drive control device. In the figure, 1 is the reactor core, 2 is the guide tube, 3 is the nuclear reactor, 4 is the five-way coupler, 5 is the indexing mechanism, and 6 is the Yahei container, 7 is the drive device, 8 is the TIP board, 9 is the TIP
Panel operation panel, 10 is operator console, 1
1 is a process computer, and 12 is a TIP detector. FIG. 5 is a conceptual diagram of the guide tube 2 and the string position of the LPRM. An LPRM string 19 is provided in the core 1 of the reactor, and each of the LPRM strings 19 has four LPRMs along its axial direction.
A detector 13 is fixedly arranged. Figure 6 is a conceptual diagram of the LPRM string arrangement in the reactor core, and as shown in the figure, there are many LPRM strings in the core
Because string 19 is arranged, one
Rather than covering all the LPRM strings 19 with TIPs, they are divided into a plurality of groups called channels, and each TIP is placed in each group. In the example shown in FIG. 6, it is divided into five groups, A, B, C, D, and E. Furthermore, FIG. 7 is a conceptual diagram of the indexing mechanism 5, in which TIPs are shared for a large number of LPRM strings 19.
The detector 12 is mechanically selected to be inserted into the guide tube 2 corresponding to which LPRM string, and the selection is made by rotating the rotary cylinder 30 using the indexing device drive signal 32. When the selection is completed, the selected guide tube position signal is output. In such a conventional TIP drive control device,
By moving the TIP detector 12 into the guide tube 2 and measuring the neutron distribution using the process computer 11, basic data for calculating the reactor power distribution is collected and the LPRM detector 13 is corrected. However, the control operation is performed as follows. A TIP panel operation panel is installed on the TIP panel 8, and the operator can use the switches on this TIP panel operation panel to request the indexing mechanism 5 to be driven or to request the removal/insertion of the detector. The indexing device drive signal 32, the detector insertion signal 42, and the detector extraction signal 41 are output to the indexing mechanism 5 and the drive device 7. The drive device 7 moves the TIP detector 12 in a direction corresponding to the detector insertion signal 42 and the detector extraction signal 41.
to drive. On the other hand, a detector signal 37 measuring the amount of neutrons detected by the TIP detector 12 is sent to the computer 11 in synchronization with a position pulse signal 36 generated when the TIP detector 12 is pulled out from the core top 50 to the core bottom 51. sent to. These are process calculator 1
Operator console 10 by operator for 1
This is performed only when there is a measurement request for the corresponding LPRM string coordinates from To operate such component equipment, the operator selects the indexing device 5 one by one by operating the switches on the TIP panel operation panel 9.
Repeatedly inserting and withdrawing the TIP detector 12,
And the signal from the TIP detector 12 is sent to the process computer 11.
A measurement request is made from the operator console 10 to input the sensor signal 37, and the process computer 11 inputs the detector signal 37 synchronized with the position pulse signal 36 and stores it in the storage unit 23. In the operation of TIP as described above, multiple
Since the TIP detector 12 measures the amount of neutrons at multiple locations, it is necessary to maintain signal simultaneity, and it is necessary to measure all LPRM strings 19 while keeping the reactor output constant. Data at the time of output has limitations such as low signal level and poor reliability, so it is necessary to operate at a specified output level or higher. For this purpose, the operator must judge the validity of the TIP detector signal based on the corresponding indicators, lamps, etc., and then operate the switch on the TIP operation panel 9 to operate. However, this is a burden on the operators, and if a monitoring error occurs, there is a possibility that the output distribution calculation and LPRM calibration will be performed using abnormal neutron data. In addition, if the reactor power level was not confirmed to be above the specified level before starting TIP operation, the reliability of the data obtained would be unreliable and could become invalid. Furthermore, in driving TIP equipment,
The operator must judge whether the string can be driven from the lamps displayed on the TIP operation panel, remember the distinction between strings that have been measured and strings that have not been measured, and measure only the unmeasured strings in sequence. It was hot. In addition, as a technology to measure all LPRM strings by automatically driving the TIP, we published Japanese Patent Publication No. 56-79996
There is a technique shown in the publication. This device drives the TIP using a built-in program sequence. However, since the data determined to have fluctuated during measurement lacked reliability, operators had to constantly monitor the reactor output. In addition, if output fluctuations are observed,
There was a problem in that it was necessary to repeat the measurement from the beginning. [Object of the invention] The present invention provides a TIP drive control device that can reduce the burden on operators, shorten measurement time, and measure the amount of neutrons in a nuclear reactor efficiently and with high reliability. With the goal. [Summary of the Invention] In order to achieve this object, the present invention includes a plurality of mobile in-core calibration devices for measuring the amount of neutrons in the reactor axis direction used for core performance calculation of a boiling water nuclear power plant. In a drive control device for a mobile in-core calibration device, a plant state determination means compares the reactor power and the rate of change in the reactor power with respective specified values, and the reactor power determined by the plant state judgment means is set to the specified value. A request receiving means that invalidates the measurement start request when the value is less than the value, and a mobile in-core calibration unit that has the largest number of local power monitoring device strings to be measured in the local power monitoring device strings shared by each mobile in-core calibration device. equipment drive control means for causing the device to start measurement based on a prescribed drive sequence; and a local power monitoring device string for invalidating the measured data when the rate of change in reactor power determined by the plant state determining section is equal to or greater than a prescribed value. remeasuring means for remeasuring at least once and suspending the measurement when the reactor power change rate determined as a result of the remeasuring is equal to or higher than a specified value;
Provided is a drive control device for a mobile in-core calibration device, characterized in that it is equipped with a restart requesting means for restarting measurement from the local power monitoring device string whose measurement was interrupted by a restart request when the interruption occurs. . [Embodiments of the Invention] The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows a configuration diagram of a TIP drive control device according to an embodiment of the present invention, and FIG. 2 shows a configuration of a process computer. Further, the same reference numerals as in FIG. 1 indicate the same or equivalent equipment. In the figure, the indexing mechanism 5 locates the TIP detector 12 moving from the container 6 to which LPRM.
It determines whether to insert the string 19 into the string 19, and selects the LPRM string 19 required by the indexing device drive signal 32, and outputs the guide tube position signal 31 when the selection is completed. 0001 position detector 16
The TIP detector 12 is located in front of the indexing mechanism (see 0001 position 20 in FIG. 7) and turns on the 0001 position signal 33 indicating that the indexing mechanism can be driven. The storage container 6 is a container that stores the TIP detector 12 when the TIP device is not operating.
When the TIP detector 12 is inside, it generates an internal container signal 34. The drive device 7 moves the TIP detector 12 in the respective directions in response to a detector extraction signal 41, a detector insertion signal 42, and a detector storage request signal 40 for storing the TIP detector 12 in the container 6. move. When the stop signal 43 is input, the driving of the TIP detector 12 is stopped, and a position pulse signal 36 corresponding to the movement of the TIP detector 12 and a detector signal 37 representing the amount of neutrons in the core measured by the TIP detector 12 are transmitted. Output. Furthermore, when the TIP detector 12 reaches the core top 50, it outputs a core top signal 44. 5-way coupler 4 is TIP
This is a coupler for guiding each TIP detector 12 to a common channel 19' when measuring the same LPRM string (common channel) 19' (see center of FIG. 6) for mutual calibration of the detectors 12. The TIP board 8 receives a guide tube position signal 31 from the indexing mechanism 5, and a 0001 position signal 33 from the 0001 position detector.
The position pulse signal 36 from the drive device 7, the detector signal 37, the core top signal 44, and the detector/shelter vessel internal signal 34 from the coolant vessel 6 are inputted and output to the process computer 11. However, position pulse signal 36
is output only when the TIP detector 12 is pulled out from the core top 50 to the core bottom 51. Furthermore, the index device drive signal 3 outputted by the process computer 11
2 is input and output to the indexing mechanism 5. Similarly, the detector drive signal 35 output from the process computer 11 is input, and when the TIP detector 12 is in the shield vessel 34 and at the 0001 position 20, the TIP detector 12 is directed toward the core 1. The detector insertion signal 42 is output to insert the
Outputs 3. In addition, the TIP detector 12 is located at the top of the core 50.
When reaching this point, a core top signal 44 is output at that time. When the detector drive signal 35 is input when the TIP detector 12 is at the top of the core 50, a detector withdrawal signal 41 is output to withdraw the TIP detector 12 out of the core. At this time, when the TIP detector 12 leaves the core top 50, the core top signal 44 turns off. TIP detector 1
2 reaches the 0001 position 20 and the 0001 position signal 33 is input, a stop signal 43 is output to the drive device 7. The process computer 11, as shown in FIG.
Process input/output device 21, detector signal input section 2
2. Storage unit 23, plant status determination unit 24, TIP
device status determination section 26, TIP device drive control section 27,
It is composed of an operator request receiving section 28. The plant state determination unit 24 receives the reactor output signal 3
8 is input and compared with the reactor output limit value 97 stored in advance in the storage unit 23 to determine whether it is equal to or higher than the specified level. If it is less than the specified value, the amount of neutrons in the reactor 3 is small even if TIP operation is performed, so the detector signal 37 is small and the measured signal is unreliable and is not used for core performance calculations. Since it is not possible to operate and there is no point in driving, the storage unit 2
Set the reactor output low flag 89 of No. 3.
In addition, the plant state determination unit 24 constantly detects changes in the reactor output signal 38 and determines the reactor output change specified value 8.
Compare with 2. If the change is larger than the specified value, it is determined that the data of the detection signal 37 cannot be used for core performance calculations, and the large reactor output change flag 91 is set. The TIP device status determination unit 26 determines that the guide tube position signal 31 from the TIP panel 8 and the TIP detector 12 are at 0001 position 2.
When the TIP detector 12 is located at 0, the 0001 position signal 33 is inputted, and when the TIP detector 12 is located inside the housing container 6, the interior container signal 34 is inputted via the process input/output device 21, and the input signal is generated. The drive permission flag 92 in the storage section 23 is set to indicate that the drive device 7 and the indexing mechanism 5 can be driven only when the In addition, when the core top signal 44 from the TIP board 8 is on, the core top flag 93 in the memory unit 23
is set, and when the core top signal 44 turns off, the core top flag 93 is reset. TIP equipment drive control unit 27 sets string flag 8 stored in storage unit 23 only when interruption flag 88 stored in storage unit 23 is reset.
3 and start the TIP drive sequence (the first
Details are shown in the table. ) is set according to the measurement order. This flag indicates that the measurement of the guide tube 2 corresponding to the string selected by the indexing mechanism 5, that is, when each LPRM string flag 83 shown in Table 1 is set, is incomplete. It indicates that the measurement is complete when it is reset. The TIP device drive control section 27 searches for the string flag 83 set and checks whether the drive permission flag 92, which is also stored in the storage section 23, is set. The TIP device drive control unit 27 inputs from the storage unit 23 the string flag 83 for the TIP device whose drive permission flag 92 is set when the interruption flag 88 of the storage unit 23 is reset, and first sets each string flag. Select the TIP device with the largest number of LPRM strings set (that is, the number of LPRM strings for which measurement is undetermined), and select the guide tube with string flags set according to the measurement order shown in Table 1 for that TIP device. Search for 2. Next, the TIP device status determination section 26
It is determined whether the guide tube selection position 94 stored in the storage unit 23 matches the searched position. If they do not match, the TIP board 8 selects the guide tube 12 that corresponds to the string flag 83.
The indexing device drive signal 32 is output toward the indexing device. On the other hand, if the judgments match, or if the driving permission flag 92 indicating that the selection of the indexing mechanism 5 is completed, the TIP detector 12
In order to insert the detector into the core 1, a detector drive signal 35 is output to the TIP board 8. TIP detector 1
When the TIP detector 12 is inserted and reaches the core top 50 and the core top flag 93 is set, the TIP detector 12 is pulled out and the TIP board 8 is inserted to measure the amount of neutrons in the core 1.
Outputs a detector drive signal to the The operator request reception unit 28 is the keyboard 1
8, each operator request signal 49 for a TIP operation start request and an operation restart request requested by the operator is input. When there is a request to start TIP operation, it is determined whether or not the reactor output low flag 89 in the memory section 23 is set, and if it is set, a message signal to that effect is output to the CRT 17 and the request is invalidated.
Only when it is not set, the string flag 83 in the storage section 23 is set for all LPRM strings 19 to make it an unmeasured string, and the error flag is reset. Also, when requesting restart of operation, the error flag 84 is reset and the interruption flag 88 is reset. The detector signal input unit 22 is a position pulse signal 36 generated in synchronization with the moving distance when the TIP detector 12 is pulled out from the core top 50, and a detector that is a neutron mass signal of the core 1 detected by the TIP detector 12. Input signal 37. The detector signal 37 is input when the detector position pulse signal 36 is generated and is stored in the storage section 23.
and stored as detector signal data 98. or,
The number of detector position pulses is counted, and when the number of pulses matches the prescribed value 87, it is determined that the TIP detector 12 has been pulled out to the bottom of the core. When the reactor is pulled out to the bottom of the core, it is checked that the large reactor output change flag 91 set by the plant state determination section 24 is not set. If it is not set,
It is determined that the measurement was completed normally and the error flag is set to 8.
4. Reset the string flag 83.
If so, it is determined whether the error flag 84 is set. If the error flag 84 is set, it indicates that the remeasurement has failed, and the interruption flag 88 is set.
If the error flag 84 is not set, it is the first abnormality and the error flag 84 is set. The CRT17 and keyboard 18 are operated by the operator.
It receives requests for operating the TIP device and outputs them as operator request signals 49 to the process computer 11. Also, a message signal 45 from the process computer 11 is displayed on the CRT 17 to notify the operator. The order in which the neutron quantities of the LPRM strings 19 assigned to each channel in each TIP device (channels A to E) are measured is determined as shown in Table 1. For example, in the case of the A channel, it is shown that LPRM strings 32-33 are measured first, then 24-29, and finally 16-41. Here, the numbers C and D channels indicate that there is no string to be measured, and the measurement ends. In other words, C and D channels are the LPRM to be measured.
It shows two to one fewer strings 19 (this is determined by the reactor type). Next, the operations of FIGS. 1 and 2, which have the above configurations, will be explained with reference to the flowchart of FIG. 3.
In this embodiment, the TIP is operated by an operator using the keyboard 1 connected to the process computer 11.
It starts with a request to start operation from 8 (101). The operator request receiving unit 28 which has input the operator request signal 49 which is the operation start request from the keyboard 18 stores the reactor output bottom flag 8 in the storage unit 23.
Check whether 9 is set (102). When the reactor power bottom flag 89 is set,
A message signal 45 indicating that the request is invalid is output to the CRT 17, and (103) is displayed on the CRT 17 to inform the operator that TIP operation is not possible.

[Table] This drive sequence is for measuring the entire string, but it can also be input from the sequence KB to measure only the necessary points.
and the process ends (104). In the case of reactor power bottom flag 89 reset, the following is shown in Table 1.
All string flags are set for the LPRM string 19 corresponding to the TIP drive sequence, and the error flag 84 is reset (105). Since the string flag 83 is set, the TIP device drive control section 27 then switches to the first TIP device drive control section 27.
The LPRM to be measured for the string flag corresponding to the TIP device with the largest number of string flags set, starting from the one with the string flags set, so that TIP operation is performed in the order of the TIP drive sequence shown in the table.
The coordinates of string 19 are taken out (106, 107).
Then, drive permission flag 9 of the corresponding TIP device
If TIP 2 is not set, the string flag is checked again in order to check other TIP devices since driving is not possible (108). If it has been set, then the indexing mechanism 5 compares with the guide tube selection position 94 whether or not the retrieved coordinates are selected (109, 110). If the comparison results are not equal, the indexing device drive signal 32 is outputted to the TIP board 8 via the process input/output device 21 in order to select the LPRM string 19 to be measured (111). When the indexing mechanism 5 operates and the target guide tube 2 is selected, the guide tube selection position 94 in the storage section 23 is updated. The TIP device drive control section 27 outputs a detector drive signal 35 to the TIP panel 8 (112). The TIP board 8 inserts the TIP detector 12 toward the core 1 based on the detector drive signal 35, and when the detector 12 reaches the core top 50, it stops driving the detector and The core top flag 93 in the storage section 23 is set by the signal 44 (113). By setting the core top flag 93, the TIP equipment drive control unit 27 outputs the detector drive signal 3.
5 is output again, (114) the TIP detector 12 is pulled out toward the core bottom 51, and is pulled out to the 0001 position 20, where it stops. TIP from core top 50 to core bottom 51
Position pulse signal 36 when the detector 12 moves
Each time the detector signal 37 occurs, the detector signal 37 is inputted by the detector signal input section 22 (115) and is stored in the storage section 23 as detector signal data 98. When the detector 12 reaches the core bottom 51 (116) and the measurement is completed, the large reactor output change flag 91 is
It is determined that the string flag 83 is not set (117), the measurement data is determined to be normal, and the string flag 83 is set.
The corresponding part of the string is reset and set as a measured string (118). When the large reactor output change flag 91 is set, refer to the error flag 84,
(119, 120, 121), and if set (indicating that an error has already occurred), the interrupt flag 88 is set (122). If the error flag 84 is not set, only the error flag 84 is set (this is not an interruption, so remeasurement is performed) (123).
If the TIP detector 12 reaches the 0001 position 20 and the abort flag 88 is not set, the TIP
The drive permission flag 92 is set by the device status determination unit 26.
is set, and the TIP device drive control section 27 performs the following
In order to measure the LPRM string 19, the string flag 83 is set, and the output of the indexing device drive signal 32 and the detector drive request signal 3 are detected.
5 output and so on until the string flag 83 is no longer set.
Insertion/extraction requests are repeated in the order of the drive sequence shown in the table (106). When the interruption flag 88 is set, the processing of the process computer 11 is as follows.
Since the TIP device drive control section 27 does not newly drive the indexing device 5 and the detector 12, the operation is interrupted (109). When a request to resume operation is made (124), the interruption flag 88 is reset (125), so TIP
The device drive control unit 27 starts requesting each device to drive, and operation resumes. [Effects of the Invention] As described above, according to the present invention, while the plant status and the operating status of the TIP system are monitored by a computer, there is no need for switch operations by operators, and each device is driven by a sequence by a computer. Therefore, the following effects are achieved. (1) This eliminates wasteful operations where the reactor output is small and measurement data becomes invalid once the operation has started and measurements have progressed. (2) Traveling detectors generally take about 50 seconds to obtain data from the top of the core to the bottom of the core, so when you want to run the detector automatically and there is a change in the reactor output, it is necessary to obtain the correct axial power distribution shape. I can't.
According to the present invention, since the measurement is invalidated when the reactor power change rate exceeds a specified value, highly accurate axial power distribution data can be obtained. (3) Since remeasurement is performed at least once, efficient measurement can be performed. In the case of a temporary change in the reactor output, the effect of automation will be reduced if the measurement is stopped, but according to the present invention, in the case of a temporary change in the reactor output, re-measurement is performed and measurement is performed frequently. is never canceled,
Efficient measurement is possible. (4) As a result of re-measurement, if the rate of change in reactor power exceeds the specified value, the measurement will be interrupted, so unnecessary measurements can be avoided. In other words, if the remeasurement is still invalid, it is determined that the cause of the reactor output change is not a temporary factor, and the measurement is interrupted, allowing operators to investigate the cause at an early stage.
As a result, the overall measurement time can be shortened. Additionally, if measurement is interrupted, the measurement is restarted from the interrupted LPRM string instead of starting over from the beginning, further reducing measurement time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a TIP drive control device according to an embodiment of the present invention, FIG. 2 is a block diagram of a process computer according to an embodiment of the present invention, and FIGS. An operational flowchart of a TIP drive control device according to an embodiment, FIG. 4 is a TIP drive control device according to the prior art.
The configuration diagram of the drive control device, Figure 5 shows the guide tube and
Figure 6 is a conceptual diagram of the LPRM string position, Figure 6 is a conceptual diagram of the arrangement of the LPRM string in the core, and Figure 7 is a conceptual diagram of the indexing mechanism. 1...Reactor core, 2...Guide tube, 3...Reactor, 4
... 5-way coupler, 5 ... Indexing mechanism, 6 ... Shiyahei container, 7 ... Drive device, 8 ... TIP board, 9 ...
...TIP panel operation panel, 10...Operator console, 11...Process computer, 12...TIP detector, 13...LPRM detector, 16...0001 position detector, 17...CRT, 18...Keyboard,
19...LPRM string, 20...0001 position,
21...Process input/output device, 22...Detector signal input section, 23...Storage section, 24...Plant state determination section, 26...TIP equipment state determination section, 27...
...TIP equipment drive control unit, 28... Operator request reception unit, 30... Rotating cylinder, 31... Guide tube position signal, 32... Indexing device drive signal, 33...
0001 Position signal, 34...Shiyahei container internal signal, 3
5...Detector drive signal, 36...Position pulse signal, 37...Detector signal, 38...Reactor output signal, 40...Detector storage request signal, 41...Detector withdrawal signal, 42... Detector insertion signal, 43...
...stop signal, 44...core top signal, 45...message signal, 49...operator request signal, 50
... Core top, 51 ... Core bottom, 81 ... Detector signal limit value, 82 ... Reactor output change regulation value, 83
... String flag, 84 ... Error flag, 87 ... Pulse number specified value, 88 ... Interruption flag, 89 ... Reactor power bottom flag, 91 ...
Large reactor output change flag, 92... Drive permission flag, 93... Core top flag, 94... Guide tube selection position, 97... Reactor output limit value, 98...
...Detector signal data.

Claims (1)

[Claims] 1. In a drive control device for a mobile in-core calibration device that is equipped with a plurality of mobile in-core calibration devices for measuring the amount of reactor axial neutrons used for core performance calculations in boiling water nuclear power plants, the reactor output and a plant state determination means for comparing the rate of change in reactor output with respective prescribed values; and a request reception means for invalidating the measurement start request when the reactor output determined by the plant state determination means is less than the prescribed value. , equipment drive control means for starting measurement based on a prescribed drive sequence from the mobile in-core calibration device that has the largest number of local power monitoring device strings to be measured in the local power monitoring device strings shared by each mobile in-core calibration device; and, when the reactor power change rate determined by the plant state determination section is equal to or higher than a specified value, the measured data is invalidated, and at least one
remeasuring means that performs remeasurement and suspends the measurement when the rate of change in reactor power determined as a result of the remeasurement is equal to or higher than a specified value; and a local power monitoring device that suspends the measurement due to a restart request when the interruption occurs. 1. A drive control device for a mobile in-core calibration device, comprising: restart request means for restarting measurement from a string.