JPH09325198A - Nuclear reactor power monitoring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nuclear reactor power monitoring apparatus facilitating the operation by eliminating the connection switching of a detector cable in the case of checking and maintaining a system by providing a switching unit at a signal processor, and improving the maintainability and reliability with a set value protector. SOLUTION: The nuclear reactor power monitoring apparatus for obtaining nuclear reactor power based on the detector signal of a local power region monitoring detector having a plurality of fission ionization chambers installed in the reactor and the detector signal of a reactor core flow detector comprises signal switching units 9a to 9n for switching the detector signals of a plurality of local power monitoring detectors 1a to 1n in a signal processor inputting the detector signals of the plurality of the detectors 1a to 1n to amplify them and calculate a mean power.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to maintenance and inspection of a reactor output monitoring device for a boiling water reactor, and particularly to a reactor in which cable attachment / detachment work is omitted during maintenance and inspection of detectors and detector cables. The present invention relates to an output monitoring device.

[0002]

2. Description of the Related Art As shown in the block diagram of a main part of FIG. 9, a reactor output monitoring apparatus for a boiling water reactor has a core output monitoring system as an example. Local Power Range Monitoring (hereinafter LP), which consists of a fission chamber for measuring local power
Detectors 1a to 1n are arranged.

L from each of the LPRM detectors 1a to 1n
The PRM detector signals 2a to 2n are input to the signal processing unit 4 via the respective LPRM detector cables 3a to 3n, and an average power range monitor (Average Power Range Monitor, hereinafter) for measuring the average output of a core not shown. , APR
(Abbreviated as M)) and the like. In the reactor output monitoring device, when the LPRM detector signal 2 exceeds a predetermined set value, a trip signal is issued to a reactor emergency stop system (not shown).

The LPRM detector signals 2a to 2n are also provided.
A for reading, multiplexing, A / D conversion and digital filtering, and averaging output calculation
The signal processing unit and the like of the PRM may be installed in the central control room in which the operator is resident or may be installed in the reactor building in which various devices are installed.

[0005]

When the signal processing unit 4 is installed in the reactor building, the LPRM detector 1 is used.
When performing maintenance inspections such as a to 1n and the signal processing unit 4, L
Connect a large number of LPRM detector cables 3a to 3n connected between the PRM detectors 1a to 1n and the signal processing unit 4,
It is necessary to temporarily remove it in the vicinity of the signal processing unit 4. In addition, there is a work for connecting the maintenance work cables 6a to 6n to the separately provided maintenance / inspection device 5, and protection is provided so that the set values of the trip signal or the like can be changed only during maintenance / inspection. There was a need.

Therefore, at the time of maintenance and inspection of the LPRM detectors 1a to 1n, the signal processing unit 4, etc., as described above, the removal of a large number of LPRM detector cables 3a to 3n and the connection work of the work cables 6a to 6n are required. At the same time, after the maintenance and inspection work is completed, each work is restored and the confirmation of the restoration is performed. Therefore, it is a complicated work in many steps, which causes a problem that a long work time is required.

An object of the present invention is to provide a switching unit in the signal processing unit to facilitate the work by eliminating the connection change of the detector cable etc. at the time of maintenance and inspection of the system.
An object of the present invention is to provide a reactor output monitoring device equipped with set value protection to improve maintainability and reliability.

[0008]

In order to achieve the above object, a reactor power monitoring apparatus according to claim 1 is a detector of a local power range monitor detector comprising a plurality of fission ionization chambers installed in a reactor. A reactor output monitoring device that obtains the reactor output based on the signal and the detector signal of the core flow rate detector, etc., inputs the detector signals of the plurality of local output monitor detectors, etc. and performs amplification and average output calculation. Further, a signal processing unit for outputting a trip signal or the like is provided with a signal switching unit for switching signals of the plurality of local output monitor detectors and the like.

The input signal from the local output monitor detector, the local output monitor signal generator, and the calibration signal generator for local output monitor can be selected by the switching operation of the signal switching unit. No need to replace the detector cable or local output monitor signal generator cable.

According to another aspect of the reactor output monitoring apparatus of the present invention, a signal processing unit inputs a generator signal from a local output monitor signal generator or the like, and a signal switching unit inputs a predetermined plurality or a single signal. Is selected. The signal switching unit selects a predetermined plurality or a single processing channel for the generator signal to perform maintenance and inspection of the signal processing unit. It should be noted that the maintenance of the average output area monitor can be performed by adjusting the amplification factor so that a predetermined instruction is given when a plurality of selections are made.

According to another aspect of the reactor output monitoring apparatus of the present invention, the signal switching section of the signal processing section is provided with logic for selecting only one channel of the generator signal from the local output monitor signal generator or the like. To do. By selecting only one channel in the signal switching unit, highly accurate maintenance inspection can be performed.

According to another aspect of the reactor output monitoring apparatus of the present invention, the signal processing section inputs generator signals from two local output monitor signal generators and the like, and one of the signal switching sections receives a plurality of or a plurality of amplification signals. Etc., and the other one selects a predetermined processing channel for amplification or the like.

By selecting one of the two generator signals as a plurality or a total number of processing channels and the other as a predetermined single processing channel by selecting the signal switching unit,
Maintenance and inspection of the average output area monitor can be performed while setting only the local output monitor to an arbitrary output level.

According to a fifth aspect of the present invention, there is provided a reactor power monitoring apparatus which controls the signal switching section together with a local output monitor signal generator in the signal processing section to display test results of a predetermined local output monitor, average output area monitor and the like. A signal processing unit maintenance / inspection device for determining is provided.

The signal processing section maintenance / inspection device takes in the output of the signal processing section and controls the local output monitor signal generator and the signal switching section to generate a predetermined local output monitor simulation signal to generate a local output monitor signal. The test result of the signal processing unit of the average output area monitor is determined.

According to a sixth aspect of the present invention, there is provided a reactor power monitoring apparatus in which a signal processing section and a signal processing section maintenance / inspection apparatus are provided in the signal processing section, and the signal processing section maintenance / inspection apparatus and the local output monitor signal generator are provided. 6. The reactor output monitoring device according to claim 5, wherein the signal is transmitted and received by optical transmission. The number of cables can be reduced by transmitting and receiving signals between the signal processing unit and the signal processing unit of the local output monitor and the average output area monitor by optical transmission.

According to a seventh aspect of the present invention, the reactor output monitoring device is characterized in that the signal processing section performs a maintenance inspection of the signal processing section by the flow rate detector or the like by inputting a simulated signal from the flow rate detection signal generator or the like. And Input the simulated signal from the flow rate detection signal generator together with the local output monitor detector signal and the output signal of the local output monitor signal generator to the signal switching section, and perform maintenance and inspection of the signal processing section related to the core output depending on the core flow rate. do.

According to another aspect of the reactor output monitoring apparatus of the present invention, in the signal processing unit, the signal switching unit disconnects the detection signal processing channel of the local output monitor detector when measuring the dielectric breakdown voltage of the local output monitor detector. Characterize. Test by applying the test voltage from the local output monitor detector dielectric breakdown voltage measuring device to the local output monitor detector cable selected by the signal switching unit. As a result, the local output monitor detector dielectric breakdown test can be performed without disconnecting the signal amplifying unit and attaching / detaching the local output monitor detector cable.

According to a ninth aspect of the present invention, there is provided a reactor output monitoring device characterized in that a signal from a local output monitor detector dielectric breakdown voltage measuring device is input by a single breakdown voltage cable in a signal processing section. The signal from the local output monitor detector breakdown voltage measuring device is sent to the signal processing unit by one breakdown voltage cable, and a predetermined local output monitor channel is selected and connected by the signal switching unit. This allows testing of multiple local output monitor detectors and reduces the number of cables.

According to a tenth aspect of the present invention, there is provided a reactor output monitoring apparatus which controls a local output monitor detector insulation breakdown voltage measuring device and the signal switching section in a signal processing section to select a predetermined local output monitor detector and to perform insulation. A local output monitor detector maintenance / inspection device for determining the breakdown voltage test result is provided.

The local output monitor detector maintenance / inspection device controls the local output monitor detector insulation breakdown voltage measuring device and the signal switching unit to select a predetermined local output monitor detector and also to isolate the local output monitor detector. The breakdown voltage test and judgment of the local output monitor detector are performed from the output signal of the breakdown voltage measuring device.

A reactor output monitoring apparatus according to claim 11 determines a local output monitor detector that has a dielectric breakdown in a local output monitor detector dielectric breakdown voltage measuring apparatus, and determines the local output monitor detector by a signal switching unit. It is characterized in that the local output monitor detector dielectric breakdown voltage of a plurality of local output monitor detectors is measured separately.

Local output monitor detector The dielectric breakdown voltage measuring device determines a local output monitor detector that has a dielectric breakdown, separates the local output monitor detector from the signal processing unit by the signal switching unit, and outputs a plurality of local outputs. Monitor detector local output Monitor detector Measure the breakdown voltage.

According to a twelfth aspect of the present invention, in the reactor output monitoring device, the electric charge of the local output monitor detector cable is removed when the output signal of the cable checker is connected to the local output monitor detector cable by the signal switching unit in the signal processing unit. The feature is that it is performed after that. Connect the cable checker to the local output monitor detector cable after removing the charge accumulated in the local output monitor detector cable by the switching operation of the signal switching unit, and remove the local output monitor detector cable from the signal processing unit. You can check without.

According to a thirteenth aspect of the present invention, in the reactor power monitoring apparatus, the signal processing unit controls the cable checker and the signal switching unit to select a predetermined local output monitor detector and disconnect the local output monitor detector cable. It is characterized by the provision of a cable maintenance / inspection device that determines the test results of short circuits and short circuits. In the cable maintenance / inspection device, the cable checker and the signal switching unit are controlled to select a predetermined local output monitor detector, and the local output monitor detector cable is subjected to a disconnection or short circuit test and the result thereof is judged.

In the reactor power monitoring apparatus according to claim 14, the signal processing unit averages the signal input unit from the confirmation operation means for displaying and confirming the data such as the local output monitor processing result and the average output area monitor processing result in the signal processing unit. It is characterized in that a protection logic by an output area monitor bypass signal is provided to permit a change in the set value by the confirmation operation means on condition that the average output area monitor bypass signal is satisfied.

When the average output area monitor bypass signal is not established, the setting value change of the detection signal of the local output monitor detector by the confirmation operation means is not permitted,
The reliability of the signal processing unit is improved.

A reactor output monitoring apparatus according to a fifteenth aspect is characterized in that the signal processing section is provided with a protect logic for changing a set value which is instructed by an average output area monitor bypass signal and a key switch of a confirming operation means. When the average output area monitor bypass signal and the ON state of the key switch in the confirmation operation means are satisfied conditions, if these conditions are not satisfied, the confirmation operation means is not permitted to change the set value of the detection signal of the local output monitor detector. This improves the reliability of the signal processing unit.

According to a sixteenth aspect of the present invention, in the nuclear reactor output monitoring apparatus, the signal processing unit transmits / receives a signal between the confirmation operation means and the local output region monitor processing unit and the average output region monitor processing unit by optical transmission. Characterize. Optical transmission is performed between the local output area monitor and average output area monitor processing section of the signal processing section and the confirmation operation means and the like, so that the influence of noise does not occur even when the number of cables is reduced and the cable is attached and detached online.

According to a seventeenth aspect of the present invention, there is provided a reactor output monitoring apparatus characterized in that the function of the signal processing section maintenance / inspection apparatus is integrated with the confirmation operation means in the signal processing section. The signal processing unit maintenance / inspection device is simplified, various signal cables are reduced, and reliability is improved.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. The same components as those of the above-described conventional technology are denoted by the same reference numerals, and detailed description thereof will be omitted. Further, the reactor output detection signal input to the signal processing unit exemplifies the nuclear reaction measurement in the core, but in addition to this, the flow rate measurement signal of the core coolant is also targeted.

The first embodiment relates to claims 1 to 3 and claim 7, and relates to maintenance and inspection of the LPRM and APRM signal processing sections. As shown in the circuit configuration diagram of FIG. 1, the signal processing unit 7 includes a large number of LPRM detectors 1a arranged in the furnace.
1n to each LPRM detector cable 3a to 3n, and each LPRM signal connector 8a to 8n. In addition, one side of the LPRM detectors 1a to 1n is generally grounded.

Further, each of the LPRM signal connectors 8a ...
8n is connected to the input side of each of the signal switching units 9a to 9n, and the output side of each of the signal switching units 9a to 9n is L
The PRM signal amplifiers 10a to 10n are connected to this L
A high voltage power source 11 for applying an LPRM detector is connected to the PRM signal amplifying units 10a to 10n.

Further, the LPRM detectors 1a to 1n are provided on the input side of the signal switching sections 9a to 9n for maintenance and inspection.
LPRM calibration signal generator 12 simulating the output signal from the
And the LPRM signal generator 13 installed outside is connected to the LPRM signal generator cable 14 by the LPRM signal generator cable 14.
It is connected through the signal generator connector 15.

Therefore, by switching the signal switching units 9a to 9n, the LPRM detectors 1a to 1 respectively.
n, the LPRM calibration signal generator 12 and the LPRM signal generator 13 are selected and the respective output signals are transmitted to the LPRM signal amplifiers 10a to 10n (claim 1).

Next, the operation of the above configuration will be described. When measuring the reactor output, the signal processing unit 7 switches each of the signal switching units 9a to 9n to transmit the detection signals from the LPRM detectors 1a to 1n to the LPRM signal amplification units 10a to 10n. can do.

By switching the signal switching units 9a to 9n, the detection signals from the LPRM detectors 1a to 1n are transmitted to the LPRM signal amplifying units 10a to 10n, respectively, so as to serve as LPRM, and a plurality of detection signals are transmitted. It is measured as an APRM by performing an average calculation process in the signal processing unit 7.

When performing maintenance and inspection of the signal processing unit 7,
The signal from the built-in LPRM calibration signal generator 12 is directly input, and the signal from the externally installed LPRM signal generator 13 is input via the LPRM signal generator cable 14 and the LPRM signal generator connector 15. .

The above generator signal is supplied to the signal switching units 9a-9.
All of them are transmitted to the LPRM signal amplifiers 10a to 10n by switching according to n. At this time, it is necessary to attach and detach not only the LPRM detector cables 3a to 3n but also the LPRM signal generator cable 14. Absent.

Therefore, a large number of LPRM signal amplifiers 10a ...
Connection of LPRM calibration signal generator 12 for 10n
Work for connecting and disconnecting the PRM signal generator cable 14 is eliminated, and restoration inspection is not required, so that work efficiency is high, and troubles due to erroneous connection and the like are prevented, and reliability of maintenance and inspection is improved.

Further, the generator signal from the LPRM signal generator 13 installed outside is connected to the signal switching units 9a to 9n in the signal processing unit 7 by one LPRM signal generator cable 14.
Then, the signal switching units 9a to 9n select a predetermined plural or singular LPRM channel to perform maintenance and inspection of the signal processing unit 7.

It should be noted that, when selecting the plurality of lines, the variation in the signal due to the difference in impedance in each connection line is adjusted to a predetermined instruction by adjusting the amplification factor of each line, and the work cable is reduced to obtain a plurality of lines. LPRM
The maintenance and inspection of the APRM channel by the channel can be performed (Claim 2).

Further, by providing a logic capable of selecting only one channel for the switching operation in each of the signal switching sections 9a-9n, the LPRM calibration signal generating section is provided.
12 or 1 from the generator signal from the LPRM signal generator 13
By connecting only to the channel, highly accurate maintenance inspection can be performed (claim 3).

Further, in the signal processing unit 7, a simulated signal from a flow rate detection signal generator (not shown) is input instead of the LPRM signal generator 13 so that the core flow rate from the core flow rate detected by the flow rate detector or the like is changed. Maintenance and inspection of the signal processing unit related to output can be performed (Claim 7).

The second embodiment relates to claim 4, wherein the LPR
Maintenance and inspection of M and APRM signal processing units. As shown in the circuit configuration diagram of FIG. 2, the signal processing unit 16 includes a large number of LPRs.
Each LPRM detector cable 3 from the M detectors 1a-1n
LPRM signal connector 8 for connecting a to 3n respectively
a to 8n.

Further, two first LPs provided outside
The generator signals from the RM signal generator 13a and the second LPRM signal generator 13b are respectively processed by one LPRM signal generator cable 14a, 14b via the LPRM signal generator connectors 15a, 15b. Entered in 16.

In the signal processing section 16, each of the signal switching sections 17a-17
n, and by switching the signal switching units 17a to 17n, the LPRM signal amplification unit 10a of a predetermined channel is connected.
It is configured to be transmitted to ~ 10n. In addition, about the other, it is set as the same structure as the said 1st Embodiment.

The operation of the above configuration is as follows: the first LPRM signal generator 13a and the second LPRM signal generator 13
With the two generator signals output by b, one selects a plurality or all LPRM channels by the signal switching units 17a to 17b, and the other selects a predetermined LPRM channel so that only the LPRM concerned is arbitrarily selected. The maintenance and inspection of the APRM can be performed while setting the output level of. As a result, the work efficiency of maintenance and inspection is improved, and a predetermined LPRM can be determined and the influence of the LPRM on the APRM can be confirmed.

The third embodiment relates to claims 5 and 6, and relates to connection of a signal processing section maintenance / inspection device. As shown in the block connection diagram of FIG.
The RM signal generator 13 and the signal processing unit maintenance / inspection device 18 for taking in the output signals from the signal processing unit 7 and determining the function of the LPRM or APRM processing unit are connected to each other. The rest of the configuration is similar to that of the first embodiment.

In addition, from the signal processing unit maintenance / inspection device 18 to the LP
The control signal 19 of the LPRM signal generator 13 is sent to the RM signal generator 13, and the control signal 19 from the LPRM signal generator 13 is sent to the signal processing unit 7.
With the generator signal 20 simulated by the LPRM signal generator 13, the processing data 21 output from the signal processing unit 7 and the signal processing unit maintenance / inspection device 18 are provided between the signal processing unit 7 and the signal processing unit maintenance / inspection device 18. The control signal 22 of the output signal processing unit 7 is transmitted and received (Claim 5). The control signal 19, the processed data 21, and the control signal 22 may be combined by an optical cable (claim 6).

The operation of the above configuration is that the signal processing unit maintenance / inspection device 18 is set to L when performing maintenance / inspection of the signal processing unit 7.
The PRM signal generator 13 receives the control signal 19 and the signal processing unit 7
The control signal 22 is output to. As a result, the LPRM signal generator 13 outputs the generator signal 20 to the signal processing unit 7,
The signal processing unit 7 to which the generator signal 20 is input operates a signal switching unit (not shown) or the like by a control signal 22 from the signal processing unit maintenance / inspection device 18 to perform a predetermined process.

Since this processing result is transmitted to the signal processing section maintenance / inspection apparatus 18 as processing data 21, the signal processing section maintenance / inspection apparatus 18 determines the test result of the predetermined LPRM and APRM processing section in the signal processing section 7. Therefore, maintenance and inspection work can be greatly saved. Furthermore, the LPR
By transmitting the control signal 19 to the M signal generator 13 and the processing data 21 and the control signal 22 between the signal processing unit maintenance / inspection device 18 and the signal processing unit 7 by optical transmission by an optical cable,
The number of cables between each other can be reduced.

The fourth embodiment relates to claims 8 and 9, and relates to a judgment test of the insulation function in the LPRM detector channel. As shown in the circuit configuration diagram of FIG. 4, the signal processing unit 23 includes L signals from a large number of LPRM detectors 1a to 1n.
LPRM signal connectors 8a to 8n are provided for connecting the PRM detector cables 3a to 3n, respectively.

Further, the signal processing unit 23 includes signal switching units 24a to 24n connected to the LPRM detectors 1a to 1n, and an LP.
The RM signal amplifiers 10a to 10n and the LPRM detector applying high voltage power supply 11 are provided. The signal switching units 24a-24
n are contacts 25a, 26a, 27a through 25n,
26n and 27n are provided, and the contacts 25a to 25n are L
The PRM detectors 1a to 1n and the contacts 27a to 27n are connected to the LPRM signal amplifiers 10a to 10n.

Further, at the contacts 26a to 26n, the Vbd measuring device 28 for measuring the local output monitor detector breakdown voltage (hereinafter abbreviated as Vbd) in the LPRM detectors 1a to 1n to determine the insulation function is Vbd. Measuring device cable 29
And Vbd measuring device connector 30 for connection.

Next, the operation of the above configuration will be described. During normal operation of the nuclear reactor, for example, the signal processing unit 23
In the signal switching unit 24a in, the contacts 25a and 27a are closed and the contact 26a is opened. Thereby, the LPRM detector 1a
From the LPRM detector cable 3a and LP
The LPRM signal amplification unit 10a is transmitted via the RM signal connector 8a and the signal switching unit 24a, and predetermined amplification processing and the like are performed.

Since the contact 26a is open at this time, the Vbd is added to the LPRM detector 1a and the LPRM signal amplifying section 10a, whereby the furnace output is measured in the LPRM detector 1a and the LPRM signal amplifying section 10a is amplified. There is no hindrance to functions, etc. Here, the LPRM detector 1a
When performing an insulation function test for
The contact 27a of a is opened, the contacts 25a and 26a are closed, and Vb
Vbd is output from the d measuring device 28.

As a result, the Vbd output from the Vbd measuring device 28 is transferred to the Lb via the signal switching section 24a via the Vbd measuring device cable 29 and the Vbd measuring device connector 30.
PRM signal connector 8a and LPRM detector cable 3a
To the LPRM detector 1a. At this time, since the contact 27a is open in the signal switching unit 24a,
By adding bd to the LPRM signal amplifier 10a, LP
It does not hinder the RM signal amplifier 10a.

In the Vbd measuring device 28, Vbd is set to L
The insulation function is determined by adding the PRM detector 1a. As a result, a large number of LPRs are generated in the signal processor 23.
M detector cable 3a to 3n and Vbd measuring device cable
Since the insulation function test by the Vbd measuring device 28 can be easily performed without attaching and detaching 29, the test work efficiency and reliability are improved (claim 8).

From the Vbd measuring device 28, one V
Although it is connected to the signal processing unit 23 by the bd measuring device cable 29, the signal processing unit 23 can easily perform an insulation function test on a large number of LPRM detectors 1a to 1n via the signal switching units 24a to 24n. Therefore, the number of cables can be reduced (claim 9).

The fifth embodiment relates to claims 10 and 11, and relates to the combination of the LPRM detector maintenance and inspection device. FIG.
As shown in the block connection diagram of FIG. 1, the signal processing unit 23 represents one channel, and the LPRM detector maintenance / inspection device 31 that takes in the detection signal from the Vbd measuring device 28 and determines the insulation function of the LPRM detector 1 is used. Are combined with each other.

Further, the signal processing unit 23 and the Vbd measuring device 28
Is input with Vbd 32 from the Vbd measuring device 28. LP
The RM detector maintenance / inspection device 31 inputs the detection signal 33 from the Vbd measuring device 28 and outputs the control signal 22 of the signal switching unit 24 to the signal processing unit 23 (claim). Ten).

Further, the LPRM detector maintenance / inspection device
Reference numeral 31 is configured to have a function of determining the LPRM detector 1 having a dielectric breakdown, disconnecting the LPRM detector 1 at the signal switching unit 24, and measuring Vbd of the plurality of LPRM detectors 1a to 1n. (Claim 11).

Next, the operation of the above configuration is as follows:
The d measuring device 28 outputs Vbd to the signal processing unit 23, and at the same time, outputs the Vbd detection signal 33 to the LPRM detector maintenance / inspection device 31.
To convey.

The LPRM detector maintenance / inspection device 31 controls the signal switching section 23 by the control signal 22 to select the predetermined LPRM detector 1, thereby selecting the Vbd 32 for the LPR.
Add to M detector 1. Furthermore, the Vbd measuring device 28 is an LP
From the Vbd32 applied to the RM detector 1, the LPRM detector 1 is monitored at the current level, and a predetermined slope (dI / d
When V) is exceeded, it is determined that dielectric breakdown has occurred.

The LPRM detector maintenance / inspection device 31
In the case of determining the LPRM detector 1 having a dielectric breakdown, since the LPRM detector 1 is disconnected at the signal switching unit 24, the Vbd of the plurality of other LPRM detectors 1 can be continuously measured. The work efficiency of the insulation function test in No. 1 is improved.

The sixth embodiment relates to claim 12, and relates to a cable checker. As shown in the circuit configuration diagram of FIG. 6, the signal processing unit 34 represents one channel, and the signal switching unit 35 and L
A PRM signal amplifier 10 and a high voltage power source 11 for applying an LPRM detector are provided.

The signal switching unit 35 has four contacts 25 to 27,
36 is provided, and the LPRM detector 1 is provided at the contact 25,
The contact point 27 is connected to the LPRM signal amplifier 10, and the contact point 26 is connected to a cable checker 37 for detecting disconnection or short circuit of the LPRM detector cable 3. Further, the contact 36 is configured to be connected to the ground line 40. The cable checker 37 is connected to the signal checker 34 via the cable checker cable 38 and the cable checker connector 39.

Next, the operation of the above configuration will be described. During normal operation, contact 26 and contact 26
By opening 36 and closing contacts 25 and 27, LPR
The detection signal from the M detector 1 passes through the signal switching unit 35 to L
It is transmitted to the PRM signal amplifier 10.

In testing the LPRM detector cable 3 by the cable checker 37, first, in the signal switching section 35,
Open contacts 26 and 27, close contacts 25 and 36, and set LP
The charge on the RM detector cable 3 is discharged to the ground line 40 via the contact 36. After this, contact 27 is opened and contact 26
The cable checker 37 is connected to the LPRM detector cable 3 by closing the
Test for wire breaks and short circuits.

As a result, the LPRM detector cable 3 can be tested in a state in which the cable checker 37 and the LPRM signal amplifier 10 are separated without removing the LPRM detector cable 3, so that the number of work steps is reduced and the work efficiency is reduced. Is improved.

The seventh embodiment relates to claim 13 and relates to a cable checker. As shown in the block connection diagram of FIG. 7, a cable checker 37 and a cable maintenance / inspection device 41 are connected to the signal processing unit 35.
A test signal 42 for disconnection and short circuit is output from the signal processing unit 35. Further, the output signal 43 from the cable checker 37 is transmitted to the cable maintenance / inspection device 41, and from the cable maintenance / inspection device 41 to the signal processing unit 35, the control signal 22 of the signal switching unit is transmitted.
Is output and configured.

As an operation of the above configuration, the cable maintenance / inspection device 41 controls the signal switching unit 34 to make a predetermined LPR.
The M detector cable 3 is selected, and a test signal is output from the cable checker 37 to easily test the LPRM detector cable 3 without removing the LPRM detector cable 3.

The eighth embodiment relates to claim 14 to claim 17, and relates to change of set value by the confirmation operation means. As shown in the set value protection logic diagram of FIG.
In the signal input section of 44, the APRM bypass signal 46 from the APRM bypass switch 45 and confirmation operation means (Human Mach
ine Interface (hereinafter, abbreviated as HMI section) 47 is provided with a protect logic 49 for permitting a set value change using an confirmation condition from the HMI section key switch 48 as an AND condition (claims 14 and 15).

Next, as an operation of the above-described configuration, the worker operates the confirmation operation means 47 for displaying and confirming the data such as the LPRM and APRM processing results, and if necessary, for example, the LPRM detector signal in the signal processing unit 44. Change the setting value for 2 etc.

When changing the set value, the AP (not shown) is protected by the protect logic 49 for permitting the change of the set value.
APRM bypass signal 46 by RM bypass switch 45
Since the setting value change command by the operator from the confirmation operation means 47 is used as the AND condition, the reliability of the setting value change work is high. By performing the operation of the set value change command by the operator in the confirmation operation means 47 with the built-in HMI section key switch 48, erroneous operation is prevented, and thus the reliability is further improved.

Further, the confirmation operation means 47 and the signal processing section 44
Since the signal transmission to and from the optical transmission is performed by an optical cable, the influence of noise does not occur even when the device is attached and detached in the online state (claim 16). Further, by integrating the functions of the various maintenance / inspection devices into the confirmation operation means 47, the number of preparatory steps for maintenance / inspection work of each part is reduced, and the work reliability is improved (claim 17).

[0078]

As described above, according to the present invention, a large number of local output region monitor detector cables are used in a reactor power monitoring device, particularly when performing maintenance and inspection of various detectors and signal cables and signal processing units relating to core power measurement. Since there is no need to attach and detach cables and cables for maintenance work, and there is no need to restore and check cable connections after work, workability and reliability of maintenance and inspection are improved, and the set value in the signal processing unit is improved. Since the protection is provided, the reliability of the set value changing operation is improved.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a signal processing unit in a reactor power monitoring system according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a signal processing unit according to a second embodiment of the invention.

FIG. 3 is a block connection diagram of a maintenance / inspection device and the like according to a third embodiment of the present invention.

FIG. 4 is a circuit configuration diagram of a signal processing unit according to a fourth embodiment of the invention.

FIG. 5 is a block connection diagram of a maintenance / inspection device and the like according to a fifth embodiment of the present invention.

FIG. 6 is a circuit configuration diagram of a signal processing unit according to a sixth embodiment of the present invention.

FIG. 7 is a block connection diagram of a maintenance / inspection device and the like according to a seventh embodiment of the present invention.

FIG. 8 is a set value protect logic diagram of an eighth embodiment according to the present invention.

FIG. 9 is a block diagram of a main part of a conventional reactor output monitoring device.

[Explanation of symbols]

1, 1a to 1n ... LPRM detector, 2, 2a to 2n ... L
PRM detector signal, 3,3a to 3n ... LPRM detector cable, 4,7,16,23,34,44 ... Signal processing unit, 5 ... Maintenance / inspection device, 6 ... Maintenance work cable, 8a-8n ... L
PRM signal connector, 9a-9n, 17a-17n, 24a-
24n, 35 ... Signal switching unit, 10, 10a to 10n ... LPRM signal amplifying unit, 11 ... LPRM detector applying high voltage power supply, 12 ... LP
Calibration signal generator for RM, 13 ... LPRM signal generator, 13a
... 1st LPRM signal generator, 13b ... 2nd LPRM signal generator, 14 ... LPRM signal generator cable, 14a ... 1st LPRM signal generator cable, 14b ... 2nd LPR
M signal generator cable, 15 ... LPRM signal generator connector, 15a ... First LPRM signal generator connector, 15
b ... Second LPRM signal generator connector, 18 ... Signal processing unit maintenance / inspection device, 19, 22 ... Control signal, 20 ... Generator signal, 21 ... Processing data, 25, 25a to 25n, 26, 26a to 26
n, 27, 27a to 27n, 36 ... Contact of signal switching unit, 28 ... Vb
d measuring device, 29 ... Vbd measuring device cable, 30 ... Vbd
Measuring device connector, 31 ... LPRM detector maintenance / inspection device, 32 ... Vbd, 33 ... detection signal, 37 ... cable checker, 38 ... cable checker cable, 39 ... cable checker connector, 40 ... ground line, 41 ... cable maintenance Inspection device 42 ... Test signal 43 ... Output signal 45 ... APRM bypass switch 46 ... APRM bypass signal 47 ... Confirmation operation means (HMI) 48 ... HMI key switch 49 ...
Protect logic.

Claims (17)

[Claims] 1. An atom for which a reactor output is obtained based on a detector signal of a local power range monitor detector composed of a plurality of fission ionization chambers installed in a nuclear reactor, a detector signal of a core flow detector, and the like. In the reactor output monitoring device, the detector signals of the plurality of local output monitor detectors are input to the signal processing unit that performs amplification, average output calculation, trip signal output, etc. to detect the plurality of local output monitor detectors, etc. A reactor output monitoring device comprising a signal switching unit for switching a reactor signal. 2. The signal processing unit, wherein a generator signal from a local output monitor signal generator or the like is input and the signal switching unit selects a predetermined plurality or a single processing channel for signal amplification or the like. The reactor power monitoring device according to claim 1, which is characterized in that. 3. The signal switching unit of the signal processing unit,
2. The nuclear reactor output monitoring device according to claim 1, further comprising logic for selecting only one channel of a generator signal from a local output monitor signal generator or the like. 4. The signal processing section inputs generator signals from two local output monitor signal generators and the like, and one of the signal switching sections has one or more processing channels for amplification or the like and another. 2. The reactor power monitoring device according to claim 1, wherein one of them selects a predetermined processing channel for amplification or the like. 5. A signal processing section maintenance / inspection device for controlling the signal switching section together with a local output monitor signal generator, etc. in the signal processing section to judge a test result of a predetermined local output monitor, average output area monitor or the like. The reactor output monitoring device according to claim 1, further comprising: 6. In the signal processing unit, signal transmission and reception between the signal processing unit and the signal processing unit maintenance / inspection device and between the signal processing unit maintenance / inspection device and the local output monitor signal generator, etc. are performed by optical transmission. The reactor power monitoring device according to claim 5, wherein 7. The signal processing unit, wherein the maintenance and inspection of the signal processing unit by the flow rate detector or the like is performed by inputting a simulation signal from the flow rate detection signal generator or the like. 6. The reactor power monitoring device according to 6. 8. The signal processing unit according to claim 1, wherein the signal switching unit disconnects the detection signal processing channel of the local output monitor detector when measuring the dielectric breakdown voltage of the local output monitor detector. Reactor power monitor. 9. The reactor output monitoring device according to claim 8, wherein in the signal processing unit, the signal from the local output monitor detector breakdown voltage measuring device is input by one breakdown voltage cable. . 10. A local unit for controlling a local output monitor detector dielectric breakdown voltage measuring device and the signal switching unit to select a predetermined local output monitor detector and to determine a dielectric breakdown voltage test result in the signal processing unit. The reactor output monitoring device according to claim 1, further comprising an output monitor detector maintenance / inspection device. 11. The local output monitor detector dielectric breakdown voltage measuring device determines a local output monitor detector having a dielectric breakdown and separates the local output monitor detector by a signal switching unit of the signal processing unit, 8. The reactor output monitoring device according to claim 7, wherein the local output monitor detector dielectric breakdown voltage of the local output monitor detector is measured. 12. The signal processing unit, after connecting the output signal of the cable checker to the local output monitor detector cable by the signal switching unit, after removing the electric charge of the local output monitor detector cable. The reactor output monitoring device according to claim 1. 13. The signal processing unit controls a cable checker and the signal switching unit to select a predetermined local output monitor detector and to judge a test result of disconnection or short circuit of the local output monitor detector cable. The reactor output monitoring device according to claim 12, further comprising a cable maintenance / inspection device. 14. A protection logic using an average output area monitor bypass signal in a signal input section from a confirmation operation means for displaying and confirming data such as a local output monitor processing result and an average output area monitor processing result in the signal processing section. 2. The reactor output monitoring apparatus according to claim 1, wherein the setting output is permitted by the confirmation operation means on condition that the average output area monitor bypass signal is satisfied. 15. The reactor output monitoring according to claim 14, wherein the signal processing unit is provided with a protect logic for changing the set value instructed by the average output area monitor bypass signal and the key switch of the confirming operation means. apparatus. 16. The atom according to claim 14, wherein in the signal processing unit, transmission / reception of a signal between the confirmation operation means and the local output monitor processing unit and the average output area monitor processing unit is performed by optical transmission. Reactor power monitoring device. 17. The reactor output monitoring device according to claim 1, wherein the function of the signal processing unit maintenance / inspection device is integrated into a confirmation operation unit in the signal processing unit.