JP2007121144A - Control rod drive time measuring device, its calibration method, diagnosis method, and correction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control rod drive time measuring device which accurately measures and verifies a driving operation of a control rod with high workability, and also to provide its calibration method, diagnosis method, and correction method. <P>SOLUTION: The control rod drive time measuring device comprises: a control rod operation module 2 for specifying a control rod to be measured; a measuring start signal generator 1 for outputting a drive start command and a drive time measurement start command; a control rod position detector 10; a PIO circuit 20 with a time tag that inputs a stroke signal from the control rod position detector 10, adds time information to the stroke signal, and generates state change time data based on the stroke signal and time information; a controller 30 for inputting the state change time data and monitoring the measurement time every control rod; a host computer 140 for editing scram time data; a display device 50 for displaying the scram time information; a control rod drive reference pulse generator 160 for outputting a reference pulse signal related to the control rod drive, a measurement start simulation signal, and a stroke simulation signal; and a signal switching apparatus 110. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control rod drive time measuring device provided for verifying the soundness of a control rod drive mechanism provided in a nuclear reactor, a calibration method, a diagnostic method, and a correction method thereof.

  In a nuclear reactor used for nuclear power generation, a control rod drive time measuring device for measuring the control rod drive time is provided in order to verify the soundness of the control rod drive mechanism (Patent Document 1). In order to cope with the occurrence of a scrum event during the operation of the reactor, measure the scram time of the control rod insertion speed, or measure the time of single scram / insertion / extraction, which is the operation of each control rod during inspection. Is done. Single scrum time measurement is a critical path operation performed immediately before the start-up of the reactor plant. In the unlikely event that normal measurement values cannot be obtained with the control rod drive time measurement device, plant startup is postponed.

  FIG. 13 is a configuration diagram of a control rod driving time measuring device having a single scram time measuring function for a conventional boiling water reactor. 13 includes a measurement start signal generator 1, a control rod operation module 2, a control rod position detector 10, and a control rod drive time measuring device main body 100. The time measuring device main body 100 includes a relay 26, a time-tagged PIO (process input / output) circuit 20, a controller 30, a host computer 40, and a CRT (display device) 50. The reactor NV is provided with a plurality of control rods L1 to L185 for adjusting the output of the reactor. The number of control rods varies depending on the output of the nuclear reactor, but here it will be described as 185.

  The control rods L1 to L185 are driven by the control rod driving devices D1 to D185 by the scram signal output from the measurement start signal generator 1. The scram signal is an event trigger signal for inserting all control rods L1 to L185 at all insertion positions in order to make an emergency stop of the reactor NV, and is shown as a measurement start signal SK in FIG. The control rod driving devices D1 to D185 provide the control rod position detector 10 with a pulse-like stroke signal corresponding to the relative position from the full length drawing position of each control rod L1 to L185, that is, the driving amount of each control rod L1 to L185. Output.

  As shown in FIG. 15, the control rod position detector 10 converts the stroke signal SR, which is an input signal, from a pulse-like waveform into a state change data and outputs it. The stroke signal is a signal indicating a moving distance at which the control rods L1 to L185 are inserted toward the upper part of the core after the measurement start signal SK that is a scram signal is generated. The time required for the entire stroke is about 2 seconds, and this time is measured as the scrum time by the control rod drive time measuring device main body 100.

The operation of the conventional control rod drive time measuring apparatus having such a configuration will be described with reference to the flowchart of FIG.
First, the time-tagged PIO circuits 20 for the number of control rods are initialized (step 61), and a measurement start signal SK that is a single scram trigger is awaited. At this time, the measurement time monitoring unit 32 of the controller 30 also waits for the measurement start signal SK.

  Next, it is checked whether or not a single scrum signal is generated (step 62). If there is a single scrum signal, control rod No. 2 is controlled from the control rod operation module 2 in order to ensure real-time display of the scram time data. Is input (step 63). Further, the measurement time monitoring unit 32 of the controller 30 starts a measurement monitoring timer 32a (step 64).

  At this start, the measurement time monitoring unit 32 requests the memory 24 of the time-tagged PIO circuit 20 to start the storage operation, and the memory 24 stores state change time data J that is the stroke signal SR from the measurement start signal SK. . Here, a relay 26 for branching and inputting a measurement start signal such as a single scram is connected to the preceding stage of the time-tagged PIO circuit 20 formed of a plurality of substrates. The operation time of the relay 26 is, for example, Since there are about 10 milliseconds, the time data is measured shorter.

  Until the measurement monitoring of the measurement time monitoring unit 32 reaches a scrum measurement period (for example, 10 seconds), the time signal is accumulated sequentially from the top of the memory 24 of the time-tagged PIO circuit 20 whenever there is a change in the state of the stroke signal SR. (Accumulation of state change time data). After the measurement monitoring of the measurement time monitoring unit 32 timed by the timer 32a reaches 10 seconds from the start (step 65), the measurement time monitoring unit 32 commands the time-tagged PIO circuit 20 to stop the measurement ( Step 66).

Thereafter, the measurement data processing unit 33 of the controller 30 inputs the state change time data stored in the memory 24 via the PIO I / F (process input / output interface) 25 and 31.
Further, the measurement data processing unit 33 of the controller 30 transmits the state change time data J to the host computer 40 via the transmission I / Fs 35 and 41 (step 67).

The host computer 40 edits the state change time data J transmitted by the transmission I / F 41 to obtain the scram time. The correction value in the correction value table 42b is added to this scrum time. Thereafter, the value of the current time timer 42C is added to update the database 42a and data processing is performed via the screen input / output unit 43 to display the scrum time and the scrum time on the CRT 50 (step 68). The display contents of the CRT 50 are shown in FIG.
JP-A-2005-233707

The above-described conventional control rod drive time measuring device has the following problems to be solved.
That is, it is a verification work by actual operation of the control rod (Problem 1). The scrum time data collection by the control rod operation and the accuracy evaluation of the time data are critical path work performed immediately before the reactor plant is started up. In the unlikely event that this device cannot measure correctly, plant startup will be postponed. This is a mental stress on the operator. Furthermore, the above-described accuracy evaluation work requires preparation of a calibrated electromagnetic oscilloscope.

  Next, there is no device abnormality notification (Problem 2). The conventional control rod drive time measuring device is not provided with an abnormality notification means. For example, missing measurement or garbled data can be considered when a measurement operation is performed. If the scrum time is not updated or if the data values are significantly different, the operator will notice an abnormality in the equipment, but if the data is lost due to an input board or transmission within the equipment, the operator will be able to identify the abnormal location of the equipment. It cannot be specified. This prolongs the recovery time of the apparatus and causes a reduction in apparatus operation rate. As for garbled data, if it is an approximate value, there is a concern that it will be used with scrum time data that is still mismeasured.

  Next, it is necessary to set a relay operation correction value used in the scram signal generation circuit (Problem 3). In the prior art described above, there is a relay that distributes and inputs scram signal generation to time-tagged PIO circuits. The actual operating time of this relay displays the scrum time shorter. Conventionally, the actual operation time of this relay is calculated by averaging the number of trials using an electromagnetic oscilloscope or the like, and manually set as a scram time correction value in the apparatus. It is a burden on the workers to perform this work at the time of introduction of the apparatus or at every inspection.

  Therefore, an object of the present invention is to provide a control rod drive time measuring apparatus capable of accurately measuring and verifying the control rod drive operation with good workability, a calibration method, a diagnostic method, and a correction method thereof.

  In order to solve the above-mentioned problems, a control rod drive time measuring device according to the present invention includes a control rod operation module that designates a control rod whose drive time is to be measured, a drive start command and a drive time measurement of the designated control rod. A measurement start signal generator that outputs a start command, a control rod position detector that detects a position of the control rod and outputs a stroke signal, a stroke signal is input from the control rod position detector, and time information is input to the stroke signal. In addition, a time-tagged PIO circuit that generates and stores state change time data based on the stroke signal and time information, and inputs state change time data from the time-tagged PIO circuit, and monitors the measurement time for each control rod. A controller, a host computer that inputs measurement time data from the controller and edits the scrum time data, and a scrum from the host computer Display device for displaying interval information, control pulse drive reference pulse generator for outputting reference pulse signal related to control rod drive, measurement start simulation signal and stroke simulation signal, measurement start signal generator and control rod position detection And a signal switch for switching a signal from the control rod and a signal from the control rod drive reference pulse generator.

  In the calibration method of the control rod driving time measuring apparatus of the present invention, the measurement start simulation signal and the stroke simulation signal are calibrated by the reference pulse signal, and the control rod driving time is measured by the calibrated measurement start simulation signal and the stroke simulation signal. A method for calibrating the apparatus.

  The control rod drive time measuring device diagnosis method of the present invention diagnoses whether the state change time data is normally stored in the memory in the time-tagged PIO circuit or read from the controller, and the data abnormality Is detected, a diagnostic packet is added to the transmission data in the data transmission from the controller to the host computer, the transmission data is confirmed in the host computer, and the response packet is returned. The transmission packet is added to the transmission data, the diagnostic packet and the response packet are verified to verify the soundness of the transmission, and when an abnormality is detected, re-transmission is attempted. A method for displaying a message.

  According to the control rod driving time measuring apparatus of the present invention, the correction method of the measurement start simulation signal is set by setting the measurement start simulation signal and the stroke simulation signal generated by the control rod drive reference pulse generator from the display device. In addition, a method for obtaining a correction value for the control rod drive time from the measured value by the stroke simulation signal and the set value.

  According to the present invention, it is possible to provide a control rod drive time measuring device that can accurately measure and verify the drive operation of the control rod with good workability, a calibration method, a diagnostic method, and a correction method thereof.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. This embodiment corresponds to the above-mentioned problem 1, and includes a control rod drive reference pulse generator 160 for generating a measurement start simulation signal and a stroke simulation signal at a site installation portion in the control rod drive time measuring device main body 200. To do. The control rod drive reference pulse generator 160 is installed in the control rod drive time measuring device main body 200 by being always connected to the input section that is the previous stage of the time-tagged PIO circuit 20 via the signal switch 110. The control rod drive reference pulse generator 160 includes a reference pulse generation circuit 163.

  That is, the control rod drive time measuring apparatus of the present embodiment includes a measurement start signal generator 1, a control rod operation module 2, a control rod position detector 10, a measuring instrument 70, and a control as shown in FIG. The control rod drive time measuring device main body 200 includes a signal switch 110, a relay 26, a control rod drive reference pulse generator 160, a time-tagged PIO circuit 20, and a controller 30. A host computer 140 and a CRT 50.

  As shown in FIG. 2, the control rod drive reference pulse generator 160 includes a reference pulse generation circuit 163, a reference pulse timer 163a, a pulse generation circuit 161, a pulse generation timer 161a, and a memory 162. . The signal switch 110 includes a measurement start signal switch 111 and a stroke signal switch 112.

  The time-tagged PIO circuit 20 of the control rod drive time measuring device main body 200 is configured on a plurality of substrates and stores the detection time of the state change time data of the stroke signal SR. Various components are mounted so as to have a function of processing and storing input signals for a plurality of control rods per board. For example, it is configured to have a function of processing and storing input signals for 4 control rods per board. When the number of all control rods is 185, the input signals for 185 are about Dispersed and processed by 47 substrates.

  For this reason, a digital input section (denoted DI in the figure) 21 for inputting the stroke signals SR for all 185 control rods output from the control rod position detector 10 for every four control rods, The stroke signal SR input to the digital input unit 21 is scanned based on the generation of the measurement start signal SK, and the value of the timer 22 is added each time the state changes (hereinafter referred to as state change time). ) A scan driver 23 that outputs data arranged in time series, a non-volatile memory (hereinafter simply referred to as a memory) 24 that stores output data of the scan driver 23, and a controller 30 that is provided with data stored in the memory 24 in a subsequent stage. A process input / output interface (denoted as PIO I / F in the figure) 25 is transmitted in response to a request from.

  The controller 30 does not use a magnetic disk, and thus does not require a cooling fan. That is, a process input / output interface 31 similar to the process input / output interface 25 and a measurement start signal SK output from the measurement start signal generator 1 are input, and monitoring of the measurement time of the control rod operation is started. The measurement time monitoring unit 32 that controls the start / stop of the storage operation of the memory 24 in the circuit 20, and the time measurement starts when the memory 24 receives a storage operation start command from the measurement time monitoring unit 32. Measurement time monitoring timer 32a for stopping the storage operation of the memory 24 when a predetermined time has passed since the measurement, and measurement change time data stored in the memory 24 are input via the process input / output interfaces 25 and 31. A transmission interface for transmitting data to the data processing unit 33 and the host computer 140 at the subsequent stage (I / And a hereinafter) 35..

  The host computer 140 is a processor that does not require the need for high-speed computation, and includes a transmission interface 41 for inputting the scram stroke time of each control rod L1 to L185 calculated by the controller 30, and each control input from the transmission interface 41. The scram stroke time of the bars L1 to L185 is output to the CRT 50 via the screen input / output unit 43, and is also configured from an editing unit 42 that outputs to the database 42a and a correction value table 42b.

  The operation of the control rod drive reference pulse generator 160 and the signal switcher 110 will be described with reference to FIG. The switches operated by the operator of the control rod drive reference pulse generator 160 are a reference pulse generation switch 165, a changeover switch 166, and a stroke simulation signal generation switch 164. The flow of operations by these switches is as follows.

<Reference pulse generation switch 165>
When the operator presses the reference pulse generation switch 165, an operation command is input to the reference pulse generation circuit 163 that generates the reference pulse signal SP. While the reference pulse generation switch 165 is being pressed, the reference pulse generation circuit 163 outputs reference pulse signals SP at regular intervals as shown in FIG. 3 according to the time of the reference pulse timer 163a. This reference pulse signal SP is also output to the reference pulse measuring instrument jack 168.

<Changeover switch 166>
When the operator presses the changeover switch 166, a lamp built in the changeover switch 166 is turned on (display during switching to the control rod drive reference pulse generator 160). Thereafter, “ON” of the switching signal CH is output to the measurement start signal switch 111 and the stroke signal switch 112, and the contact in the measurement start signal switch 111 and the stroke signal switch 112 is connected to the control rod drive reference pulse generator 160. Switch to the side.

  The changeover switch 166 has an interlock that enables the measurement start simulation signal SK2 and the stroke simulation signal SR2 in the control rod drive reference pulse generator 160 to be output. When the operator presses the changeover switch 166 again, the lamp built in the changeover switch 166 is turned off (disconnection display of the control rod drive reference pulse generator 160). Thereafter, “OFF” of the switching signal CH is output to the measurement start signal switch 111 and the stroke signal switch 112, and the contact in the measurement start signal switch 111 and the stroke signal switch 112 controls the measurement start signal generator 1. The input is switched to the rod position detector 10 side.

<Stroke simulation signal generation switch 164>
When the operator presses the stroke simulation signal generation switch 164, an operation command is input to the pulse generation circuit 161 that generates the measurement start simulation signal SK2 and the stroke simulation signal SR2. In the pulse generation circuit 161, when the stroke simulation signal generation switch 164 is pressed, the measurement start simulation signal SK2 is first generated to start the pulse generation timer 161a. Thereafter, if the values shown in the state change time data of the channels CH1 to CHn stored in the memory 162 match the timer 161a and match, the state change 1 which is a state change signal as shown in FIG. 3 is generated. . Then, state change signal data up to state change 48 are generated while repeatedly checking the state change time data in the memory 162 and the pulse generation timer 161a. Thereby, a constant pulse signal is always possible no matter how many times it is performed. The measurement start simulation signal SK2 and the stroke simulation signal SR2 are also output to the measuring instrument jack 167.

Next, a calibration flow of the control rod drive reference pulse generator 160 and the control rod drive time measuring device main body 200 will be described with reference to FIG.
First, calibration of the control rod drive reference pulse generator 160 will be described. The operator connects the measuring instrument 70 to the control rod drive reference pulse generator 160 (step 11). Next, by pressing the reference pulse generation switch 165, the reference pulse signal SP is generated from the reference pulse generation circuit 163, and the stroke simulation signal SR2 and the measurement start simulation signal SK2 are output from the pulse generation circuit 161 (step 12). The three signals are recorded by the measuring instrument 70 (step 13). An example of recording three signals is shown in FIG. Based on the reference pulse signal SP of this recording, it is confirmed whether or not the accuracy of the pulse width and pulse interval of the measurement start simulation signal SK2 and the stroke simulation signal SR2 are within the reference values (step 14). When the accuracy of the measurement start simulation signal SK2 and the stroke simulation signal SR2 is within the reference value, the calibration of the control rod drive reference pulse generator 160 is completed, and when the accuracy is outside the reference value, the control rod drive reference pulse generator 160 is adjusted (step 15).

Next, calibration of the control rod drive time measuring device main body 200 will be described. The changeover switch 166 of the control rod drive reference pulse generator 160 installed in the control rod drive time measuring device main body 200 is pushed to switch the input source of the signal switch 110 to the control rod drive reference pulse generator 160 side (step 16). . Next, the stroke simulation signal generation switch 164 is pressed to output the stroke simulation signal SR2 and the measurement start simulation signal SK2 from the pulse generation circuit 161 (step 17). The control rod drive time measuring apparatus main body 200 measures the control rod drive time based on the stroke simulation signal SR2 and the measurement start simulation signal SK2 (step 18). The measurement result of the control rod drive time measuring device main body 200 and the operation time of the stroke simulation signal SR2 are compared to check whether the accuracy of the measurement result is within the reference value (step 19). When the accuracy of the control rod driving time, which is the measurement result of the control rod driving time measuring device main body 200, is within the reference value, the calibration of the control rod driving time measuring device main body 200 is completed, and when the accuracy is outside the reference value, The control rod drive time measuring device main body 200 is adjusted (step 20).
After calibrating the control rod drive time measuring apparatus main body 200 in this way, the control rod drive time is measured by substantially the same operation as described with reference to FIG. 14 in [Background Art].

  According to the control rod drive time measuring device of the present embodiment, the control rod drive time measuring device main body 200 can be calibrated and adjusted by the simulation signals SK2 and SR2 before measuring the actual drive time of the control rod drive mechanism. Therefore, it is possible to accurately measure and verify the control rod drive operation with good workability. During the inspection period of the control rod drive time measurement device, the measurement accuracy and soundness of the device can be confirmed, so it is no longer a critical path work item at plant startup, and the mental burden on the operator can be eased. it can.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, in response to the problem 2, a diagnostic check function is provided in a functional part that controls time data calculation in the control rod drive time measuring device main body 201 and a functional part that has low transparency by adopting a general-purpose protocol. As functional locations that control time data calculation, a circuit diagnosis result adding circuit is provided in the time-tagged PIO circuit 121 at the site installation, and a circuit diagnosis result check circuit is provided in the host computer 141 that performs data editing. A transmission diagnostic circuit is provided in the transmission circuit between the controller 131 and the host computer 141 installed in the central operation room as a functional part having low transparency due to the adoption of a general-purpose protocol.

  That is, the control rod drive time measuring apparatus of the present embodiment includes a measurement start signal generator 1, a control rod operation module 2, a control rod position detector 10, and a control rod drive time measuring device as shown in FIG. The control rod drive time measuring device main body 201 includes a main body 201, the signal switch 110, the relay 26, the control rod drive reference pulse generator 160, the PIO circuit 121 with time tag, the controller 131, and the host computer 141. And CRT50 and CRT138.

  The time-tagged PIO circuit 121 includes a digital input unit 21, a scan driver 23, a timer 22, a memory 24, a circuit diagnosis unit 127, and a process input / output interface 25. The controller 131 includes a process input / output interface 31, a measurement time monitoring unit 32, a timer 32 a, a measurement data processing unit 33, a transmission diagnosis unit 136, a screen output unit 137, and a transmission interface 35. The host computer 141 includes a transmission interface 41, a transmission diagnostic unit 144, an editing unit 42, a database 42a, a correction value table 42b, a diagnostic display editing unit 146, a circuit diagnostic unit 145, and a screen input / output unit 43. I have. The configurations of the signal switch 110 and the control rod drive reference pulse generator 160 are the same as those shown in FIG.

  The circuit diagnosis is performed as follows. That is, as shown in FIG. 6, first, the circuit diagnosis unit 127 detects a digital input (DI) abnormality, a timer abnormality, and a memory parity occurrence of the time-tagged PIO circuit 121. In the scan driver 23, if an abnormality is detected in the circuit of the digital input unit 21 that receives the stroke signal SR and converts it into a digital ON / OFF signal, a DI abnormality index is set in the diagnostic data K and the circuit diagnostic unit. 127 is notified (step 21). Next, when no digital input abnormality is detected, the timer 22 is referred to in order to input time data which is a base of the state change time calculation by the scan driver 23. At this time, if an abnormality is detected in the timer 22, a timer abnormality index is set in the diagnosis data K and notified to the circuit diagnosis unit 127 (step 22). Thereafter, if the digital input is not abnormal, a parity code is added to the timer value and stored in the memory 24. For example, in the case of odd parity, parity bits are added to the binary bit string of the timer 22 so that the whole becomes odd. The above digital input to parity code addition operation steps are continuously performed every time the digital input signal changes state (step 23).

  After reaching the measurement period monitored by the controller 131, the parity code is checked after the memory 24 is input. For example, in the case of odd parity, the parity bit is checked so that the entire binary bit string of the timer 22 is odd. After the check, if the parity bit is not consistent, a parity generation index is set in the diagnosis data K as a parity generation and notified to the circuit diagnosis unit 127.

  The host computer 141 inputs the diagnostic data K from the circuit diagnostic unit 127 via the controller 131, and the circuit diagnostic unit 145 updates the diagnostic data K to the database 42a (step 24). The database 42a is referred to by the diagnosis display editing unit 146, and if an abnormality is set in the diagnosis data K, an abnormality message is output to the CRT 50 via the screen input / output unit 43. At this time, the scrum time is updated, but the scrum time is displayed as a code which is an abnormal data display.

  Next, transmission diagnosis related to verification of transmission integrity in the apparatus will be described with reference to the flow shown in FIG. 7 and FIG. FIG. 8 shows the flow of the transmission protocol during single scrum measurement between the controller 131 and the host computer 141 in the apparatus.

  In transmitting the state change time data J to the host computer 141, the controller 131 first outputs an initial diagnosis packet including an event type. At that time, the transmission diagnostic unit 136 adds a diagnostic packet, and transmits it to the host computer 141 via the transmission interface 35 (steps 31 to 32).

  The transmission output data is input via the transmission interface 41 of the host computer 141 and sent to the transmission diagnosis unit 144. The transmission diagnostic unit 144 confirms the event type signal, and transmits and outputs only the added diagnostic packet as a response packet to the return controller 131 (steps 33 to 34).

  The response packet input to the controller 131 is collated with the initial diagnosis packet added first by the transmission diagnosis unit 136 (step 36). If the collation results match, it is determined that the event type signal has been successfully transmitted (steps 37 to 38), and the process proceeds to the next state change time data transmission stage. If the verification results do not match or no response packet is input within a predetermined time (step 35), the transmission is failed and a predetermined number of transmission retries are attempted (step 35a). If transmission fails even after a predetermined number of retries, an alarm is output or a message is output to the CRT 138 via the screen output unit 137 (step 46).

  The transmission diagnosis of the state change time data J is performed in the same procedure. If the event type signal transmission is successful, the controller 131 adds a diagnostic packet to the state change time data J at the transmission diagnostic unit 136 (step 39), and transmits and transmits it to the host computer 141 (step 40).

  The transmission diagnosis unit 144 of the host computer 141 confirms the input state change time data J and stores it in the database 42a, and transmits only the diagnosis packet as a response packet to the return controller 131 (steps 41 to 42). The transmission diagnosis unit 136 of the controller 131 collates the input response packet with the second diagnosis packet (step 44). If they match, the transmission of the state change time data J is successful (step 45) and the transmission is completed. If they do not match or no response packet is input within a predetermined time (step 43), the transmission is failed and a predetermined number of transmission retries are performed (step 43a). If transmission fails even after a predetermined number of retries, an alarm is output or a message is output to the CRT 138 via the screen output unit 137 (step 46).

  According to the control rod drive time measuring device of the present embodiment, the circuit and data transmission function of the control rod drive time measuring device main body 201 can be diagnosed before measuring the actual drive time of the control rod drive mechanism. The drive operation of the control rod can be accurately measured and verified with good workability. Since a data loss message of the device unmeasurable part or the scram time is output, the operator is notified accurately. As a result, the recovery time of the apparatus is shortened and the operating rate is improved. Furthermore, since it is guaranteed by the operation of the parity addition code, there is no need to doubt the displayed scram time data, and sufficient reliability is ensured.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS.
The present embodiment corresponds to the above-mentioned problem 3, and the scrum time that is the output waveform of the control rod drive reference pulse generator 160 is constant. The host computer that edits the scrum time in advance has a pulse generator table 142C that can be set by the operator. Further, a circuit for operating the control rod drive reference pulse generator 160 to obtain a difference between the scram time data calculated by the control rod drive time measuring device main body 200 and the aforementioned pulse generator table 142C and setting it in the correction value table 42b is provided. It has.

  That is, the control rod driving time measuring apparatus of the present embodiment includes a measurement start signal generator 1, a control rod operating module 2, a control rod position detector 10, and a control rod driving time measuring device as shown in FIG. The control rod drive time measuring device main body 202 includes a main body 202, the signal switch 110, the relay 26, the control rod drive reference pulse generator 160, the time-tagged PIO circuit 20, the controller 30, and the host computer 142. And a CRT 50.

  As shown in FIG. 2, the control rod drive reference pulse generator 160 includes a reference pulse generation circuit 163, a reference pulse timer 163a, a pulse generation circuit 161, a pulse generation timer 161a, and a memory 162. Yes. The signal switch 110 includes a measurement start signal switch 111 and a stroke signal switch 112.

  The time-tagged PIO circuit 20 includes a digital input unit 21, a scan driver 23, a timer 22, a memory 24, and a process input / output interface 25. The controller 30 includes a process input / output interface 31, a measurement time monitoring unit 32, a timer 32a, a measurement data processing unit 33, and a transmission interface 35. The host computer 142 includes a transmission interface 41, an editing unit 42, a database 42a, a correction value table 42b, a pulse generator table 142C, and a screen input / output unit 43.

  The correction operation of the control rod drive time measuring apparatus of the present embodiment will be described with reference to the flowchart of FIG. The time measurement result in the sentence indicates scrum time / scrum time data. The output waveforms of the channels CH1 to CHn of the control rod drive reference pulse generator 160 are all the same.

  First, the operator sets the setting value of the pulse waveform generated by the control rod drive reference pulse generator 160 from the setting screen as shown in FIG. 11 from the CRT 50 (step 51). The set values are stored in the pulse generator table 142c via the screen input / output unit 43 as shown in FIG. 12 (step 52).

  The operator generates a measurement start simulation signal SK2 and a stroke simulation signal SR2 which is a pulse signal for simulating control rod drive from the control rod drive reference pulse generator 160, and measures the time with the control rod drive time measuring device main body 202. (Step 53).

  The time measurement result measured by the control rod drive time measuring device main body 202 is sent to the host computer 142 via the time-tagged PIO circuit 20 and the controller 30. Here, the host computer 142 determines whether or not the time measurement has been performed correctly (step 54), and when an abnormality is recognized, the operator is notified via the CRT 50 that the tuning is impossible due to the abnormality ( Step 55). If the measurement has been performed correctly, a single scrum time measurement result as shown in FIG. 12 is sent, and the time measurement result is temporarily stored in the database 42 a by the editing unit 42.

The editing unit 42 collects the measurement value based on the simulation signal from the control rod drive reference pulse generator 160 stored in the database 42a, and calculates the average value (step 56).
Further, the editing unit 42 refers to the average value of the calculated measurement values and the set value stored in advance in the pulse generator table 142c, and obtains a correction value from the difference (step 57). The calculated correction value is stored in the correction value table 42b by the editing unit 42 as shown in FIG. 12 (step 58).

The above steps (51 to 58) are performed on the plurality of relays 26 used in the control rod drive time measuring device main body 202.
Here, when the values of the channels CH1 to CHn of the control rod drive reference pulse generator 160 are different, a pulse generator setting value screen and a pulse generator table are newly provided, and a “pulse generator table— “Measured value = difference” is obtained. The average value of this difference is calculated. The average value becomes the correction value of the corresponding channel.

  According to the control rod drive time measuring apparatus of the present embodiment, the correction value calculation and the setting thereof are automatically tuned, so that the work of setting the correction value at the time of apparatus introduction and inspection is reduced. Therefore, the drive operation of the control rod can be accurately measured and verified with good workability.

  In the above description, the single scrum measurement, which was a critical path work at a nuclear power plant, was explained. However, in the unlikely event that the control rod scrum is in operation, or an arbitrary number of scrum operations, SRI (selective control rod insertion), The same effect can be expected for measuring the insertion / withdrawal time in the regular inspection work. In the above description, the high-speed control rod drive mechanism has been described. However, the present invention can be sufficiently applied to conventional, FMCRD, or pressurized water reactors having different drive mechanism types.

The figure which shows the structure of the control-rod drive time measuring apparatus of the 1st Embodiment of this invention. The figure which shows the structure of the signal switch and control rod drive reference | standard pulse generator with which the control rod drive time measuring device of the 1st Embodiment of this invention is equipped. The figure which shows the output signal waveform of a control-rod drive reference pulse generator, and demonstrates operation | movement of the control-rod drive time measuring apparatus of the 1st Embodiment of this invention. The figure which shows the flow of calibration of the control-rod drive time measuring device main body with which the control-rod drive time measuring device of the 1st Embodiment of this invention is equipped. The figure which shows the structure of the control-rod drive time measuring apparatus of the 2nd Embodiment of this invention. The figure which shows the flow of the circuit diagnosis of the control-rod drive time measuring apparatus of the 2nd Embodiment of this invention. The figure which shows the flow of the transmission diagnosis of the control-rod drive time measuring apparatus of the 2nd Embodiment of this invention. The figure which shows the flow of the protocol at the time of the single scram transmission diagnosis by the control rod drive time measuring device of the 2nd Embodiment of this invention. The figure which shows the structure of the control-rod drive time measuring apparatus of the 3rd Embodiment of this invention. The flowchart which shows the correction method of the control-rod drive time measuring apparatus of the 3rd Embodiment of this invention. The figure which shows the setting screen used at the time of correction | amendment of the control-rod drive time measuring apparatus of the 3rd Embodiment of this invention. The figure which shows the table used at the time of correction | amendment of the control-rod drive time measuring apparatus of the 3rd Embodiment of this invention. The figure which shows the structure of the conventional control rod drive time measuring apparatus. The flowchart which shows operation | movement of the conventional control rod drive time measuring apparatus. The figure which shows the control rod drive output signal waveform of the conventional control rod drive time measuring apparatus. The figure which shows the dialogue screen of the conventional control rod drive time measuring device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Measurement start signal generator, 2 ... Control rod operation module, 10 ... Control rod position detector, 20, 121 ... PIO circuit with time tag, 26 ... Relay, 30, 131 ... Controller, 40, 140, 141 ... Host Computer, 50, 138 ... CRT, 70 ... Measuring instrument, 100, 200, 201, 202 ... Control rod drive time measuring device main body, 110 ... Signal switch, 160 ... Control rod drive reference pulse generator, D1-D185 ... Control Rod driving device, L1 to L185 ... control rod, NV ... reactor.

Claims (6)

  A control rod operation module for designating a control rod for which drive time is to be measured, a measurement start signal generator for outputting a drive start command and a drive time measurement start command for the designated control rod, and a position of the control rod are detected. A control rod position detector that outputs a stroke signal, a stroke signal is input from the control rod position detector, time information is added to the stroke signal, and state change time data is generated based on the stroke signal and the time information. A time-tagged PIO circuit to be stored, a controller that inputs state change time data from the time-tagged PIO circuit and monitors the measurement time for each control rod, and measurement time data from the controller to edit the scram time data Host computer, display device for displaying scrum time information from said host computer, and reference pulse for control rod drive Control rod drive reference pulse generator for outputting a measurement start simulation signal and stroke simulation signal, a signal from the measurement start signal generator and the control rod position detector, and a signal from the control rod drive reference pulse generator A control rod drive time measuring device, comprising: a signal switching device for switching between the two.   A diagnostic means for diagnosing whether or not the state change time data is normally stored in the memory in the time-tagged PIO circuit or read from the controller; and when the data abnormality is found by the diagnostic means, An abnormality notification means for notifying the effect, a diagnostic packet adding means for adding a diagnostic packet to transmission data in data transmission from the controller to the host computer, and a response packet by confirming the transmission data in the host computer A response packet adding means for adding to the return transmission data, a verification means for verifying the soundness of the transmission by comparing the diagnostic packet and the response packet, and attempting retransmission when an abnormality is detected, A display means for displaying a predetermined message when an abnormality continues for a predetermined time. Control rod drive time measuring apparatus according.   Display device operating means for setting the setting values of the measurement start simulation signal and stroke simulation signal generated by the control rod drive reference pulse generator from the display device, a pulse generator table for storing the setting values, 2. A calculation means for obtaining a correction value of a control rod drive time from a measurement value based on a measurement start simulation signal and a stroke simulation signal and the set value, and a correction value table for storing the correction value. 2. The control rod driving time measuring device according to 1.   The control rod driving time measuring device is calibrated by calibrating the measurement start simulation signal and stroke simulation signal with the reference pulse signal, and calibrating with the calibrated measurement start simulation signal and stroke simulation signal. Calibration method for control rod drive time measuring device.   Diagnose whether the state change time data is normally stored in the memory in the time-tagged PIO circuit or read from the controller, and if a data abnormality is found, notify that fact, In the data transmission from the controller to the host computer, a diagnostic packet is added to the transmission data, the transmission data is confirmed in the host computer, and a response packet is added to the return transmission data. The packet is verified to verify the soundness of the transmission, and retransmission is attempted when an abnormality is detected, and a predetermined message is displayed when the abnormality continues for a predetermined time. Diagnostic method for control rod drive time measuring device. A setting value of a measurement start simulation signal and a stroke simulation signal generated by the control rod drive reference pulse generator from the display device is set, and a control rod is determined from the measurement value and the setting value by the measurement start simulation signal and the stroke simulation signal. 2. The correction method for a control rod drive time measuring apparatus according to claim 1, wherein a correction value for the drive time is obtained.

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