JPS62272197A - Tool for inspecting nuclear-reactor vessel level measuring system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention 1 Suction Δ11 This invention relates to an inspection tool for a reactor vessel level measurement system, and in particular, to an inspection tool for measuring a fluid level in a pressurized water reactor and Measurement of core coolant fluid level based on temperature changes, fluid pressure changes caused by core coolant pump operation, coolant outlet temperature changes, and core coolant inlet pressure changes to obtain the actual fluid level. The present invention relates to a test tool for computer-controlled measurement systems that compensates for changes in measured values.

This invention utilizes the reactor vessel level measurement system (RVLIS) of FIG. 1 in an electrical field line terminal block.
) 10 to replace and simulate various signals provided by the fluid level monitoring system. RVLIS system 1o
is deployed with two identical redundant systems, although only one system is shown in FIG. Each system 10 receives input from differential pressure cells 11-13, hydraulic isolators 14-16, resistance temperature detectors 17-23, pump condition monitor 24, wide range pressure sensor 25, temperature hot sensor 26, and various The system includes a subsystem or auxiliary device for sampling the input signal and converting the sampled value to a vessel fluid level using a steam table. An 8-bit or 16-bit microcomputer processor within system 10 converts all of these inputs to the vessel level and displays that level to the plant operator.

Capillary fluid impulse lines extend through the reactor containment wall 27 to the hydraulic isolators 14-16. The hydraulic isolators 14-16 are the hydraulic isolators 14-16.
16 exceeds the range, i.e. experiences too much pressure, the measuring system 10 is provided with a hydraulic connection, line separation,
and limit switch input. Isolator 14-1
6 exceeds the range, the system measurements will be erroneous. Differential pressure cells 11-13 measure the difference in fluid height between a reference line receiving system pressure through hydraulic isolators 14-16 outside the containment vessel wall and the fluid level within reactor vessel 28. . Reactor containment vessel wall 2
The inner impulse line of 7 is exposed to temperature increases that change the fluid density, which must be taken into account in vessel level determination. Resistive temperature detectors 17-23 designed to be mounted on the spacecraft are routed separately to determine the impulse line temperature.
placed on each vertical path of the impulse line. This temperature is used to correct the reference leg density contribution to the differential pressure measurement. That is, when the temperature in the impulse line changes, the density of the water changes, changing the height of the water measured by cells 11-13. As the fluid density changes, it is thus necessary to change the compensation value for the differential pressure cell output. Another factor that affects reactor fluid level measurements is the condition of the two reactor coolant pumps. Whenever pump 29 is on, the differential pressure in reactor vessel 28 is higher than when it is off, and therefore the pump conditions across the core are provided by pump condition monitor 24 to reflect the actual reactor fluid level. Allows calculation. Depending on which of the two, possibly four, coolant pumps is in operation, the coolant differential pressure across the core will change, and the indicated fluid level within the vessel will also change. The differential pressure across the core is measured by wide range pressure sensor 25. Consider J: when calculating vessel fluid level! ': Another factor that must be considered is the coolant fluid outlet temperature as measured by the temperature hot sensor 26. Whenever the coolant temperature is high, the coolant density is low and the output of the differential pressure cells 11-13 has to be compensated for accordingly.

An 8-bit or 16-bit microprocessor within the RVLISIO samples the various sensors described above and displays vessel fluid levels on a remote display 30 for observation by the plant operator. System 10 also includes a local display 31 used by maintenance personnel to inspect the system.

Local display 31 may not only display the reactor vessel fluid level, but also all of the various input signals used to calculate the fluid level. The reactor vessel level measurement system 10 of FIG. 1 can be purchased from Westinghouse Electric Corporation. Systems based on 8-bit microcomputers are called RVLIS, while systems based on 16-bit microcomputers are called RVL.
It is called IS-86.

Prior to this invention, dummy power was supplied to the RVLIS by using edge connectors on various circuit boards that bypassed all interface circuits and analog-to-digital converters.

Hikari” Toketaka! The purpose of this invention is to provide a reactor vessel level measurement system (R
VLIS>'s electrical field connection terminal block.

Another object of this invention is to test all RVLIS circuits that include interface and translation circuits.

Yet another object of the invention is to simulate the changes in the input signal to the r(VLIS).

A further object of the invention is to provide an inspection tool suitable for training maintenance personnel and power plant operators.

An additional object of this invention is to provide an inspection tool suitable for inspecting an RVLIS prior to installation.

The present invention provides an inspection tool that simulates all inputs to a reactor vessel level IT measurement system. The test tool includes a device that provides a variable resistance value with a resistance temperature sensor potentiometer to simulate the input provided by the resistance temperature sensor in pA. Testing tools are also
Also includes apparatus for simulating pump status signals and hydraulic isolator overrange signals with status and limit switches. The invention further includes an apparatus for simulating temperature hot sensors, differential pressure cell sensors, and pressure wide range sensors with potentiometers. The invention also includes a meter that allows the test tool operator to compare the value of the signal output by the test tool to the value measured and displayed by the metrology system.

These, together with other objects and advantages, will become more fully apparent from the description of construction and operation set forth below with reference to the accompanying drawings. It should be noted that like reference numerals indicate like parts throughout the drawings.

The test tool of the present invention simulates all of the level monitoring signals encountered in Westinghouse Electric Corporation's pressurized water reactors, including resistance temperature detector signals. , a pump status and hydraulic isolator overrange limit signal, a reactor coolant outlet temperature sensor signal, a differential pressure cell signal, and a reactor coolant inlet pressure sensor signal. 8 bit (9RVLI
The inspection tools for both the 16-bit (RVL I S-86) and 16-bit (RVLI S-86) reactor vessel level measurement systems are designed to provide the maximum number of sensors that will be encountered in the field. Whenever a sensor is not where it should be, the simulator or test signal generation circuitry associated with that sensor does not need to be modified.6 Figure 2 shows an 8-bit microprocessor-based R
An inspection tool 40 is shown connected to VLISIO.

The inspection tool 40 includes resistance temperature detectors 17 to 23 (Fig. 1).
It includes a resistance temperature detector simulator 41 that includes 500 ohm potentiometers 42-48 to simulate the temperatures measured by the resistor. Since the maximum number of resistance temperature detectors encountered in the field is seven, seven potentiometers 42-48 are provided. Botenshome - Evening 42~
Potentiometers 42-48 do not need to be precision potentiometers, but must be capable of handling 1 volt and 1 milliamp of current, and must be lockable to prevent misalignment of settings. It is connected to the appropriate terminals T1-T39 of the associated terminal block 49 within the metrology system 10 as shown in FIG. Note that the four special terminal blocks in the 8-bit RVLIS are terminal block 105, and the wiper arm of the potentiometer is not connected to the negative terminal (-). In operation, the negative terminal (-) of each terminal pair provides 1 milliampere of current to the associated potentiometer, which is supplied by an operational amplifier within the measurement system 10. When the potentiometer is adjusted, the voltage will vary between 0 and 0.5 volts. Twenty-eight wire cables connect the simulator 41 to the terminal block 49 and the wire cables connect the simulator 41 to the terminal block 49.
The cable has a spade lug connector on the RVLI S side for easy connection.
nnccLor). Although this cable does not have to be of any particular type, the wire should be at least 22 gauge. A military locking or retainable connector may be used on the test tool 40 side.

FIG. 3 shows the pump condition simulator 50 of the inspection tool 40 connected to the RVLISIO. The pump condition simulator includes pump condition switches 51-54. The four pump status switches 51-54 are provided because four is the maximum number of reactor coolant pumps that will be encountered in the field. These switches may be any type of single pole, single throw switch capable of transmitting a +5 volt signal. Pump status switches 51-54
are connected to terminals T1-Tll of the associated terminal block 55 in the measurement system 10, as shown in FIG. When the pump condition simulator 50 is operated, the 5 volt signal provided by the positive terminal (+) is returned to the measurement system 10 through the negative terminal (-).

The presence of a 5 volt sense signal on the negative terminal indicates that
This simulates the operating or on-state of the corresponding reactor coolant pump as generated by the pump status monitor 24.

FIG. 3 also shows hydraulic isolators 14 to 16 (FIG. 1).
Also shown is an isolator over-range limit simulator 56 which simulates the over-range limit signal generated by and includes conventional single-pole, single-throw switches 57-59. Switches 57-59 are connected to terminal points 713-T20 of terminal block 55 as shown in FIG. Terminal block 55 in the 8-bit RVLIS is shown as terminal block 101. In operation, when limit switches 57-59 close, they return a +5 volt detection signal to the RVLIS, simulating fluid pressure exceeding the range of its associated hydraulic isolator.

A fourteen conductor wire cable with a spade rack connector on the RVLISIO side should be provided to connect the pump condition simulator 50 and the isolator over-limit range limit simulator 56 to the measurement system 10. Military lockable connector is inspection tool 40
Can be used on the side of

FIG. 4 shows a temperature hot sensor simulator 60 connected to the measurement system 10 and simulating the coolant outlet temperature sensor 26. The temperature hot simulator is connected to the 5-pol 1-power supply 61. This 5 volt power supply 61 has a voltage accuracy of 10 percent and
Any off-the-shelf device may be used as long as it supplies a milliampere current. Power supply 61 is connected to 200 ohm resistors 62 and 63 in temperature hot simulator 60 and
00 ohm resistor is connected to the measurement system 10.
Connected to kiloohm potentiometers 64 and 65. Resistors 62 and 63 and potentiometers 64 and 65
Although it does not have to be precise, the potentiometer must be of a type that can be locked or held so that the value does not change. temperature hot
The sensor simulator 60 is connected to terminals T1-T9 of an associated terminal block 66 within the measurement system 10. The wiper arm of each potentiometer has a positive terminal (
Care must be taken to ensure that the In operation, when potentiometers 64 and 65 are rotated, simulator 60 causes RVLIS 10 to
Depending on whether the termination is a 50 ohm or 250 ohm termination, it provides a signal in the range of either 1 to 5 volts or 0.2 to 1 volt. Inspection tool 40
The operator only needs to be concerned about the possible range of the generated signal, not the termination resistance.

FIG. 4 also includes cells 11-13 (
Also shown is a differential pressure cell simulator 67 that simulates the differential pressure changes detected by FIG. 1). Between the wiper arms of potentiometers 68-70 and terminal block 66 there are 1.2 kilohm resistors 71-73. Potentiometers 68-70 and resistors 71-73 need not be precision components. Since the maximum number of differential pressure cells encountered in the field is three, the simulator 67 includes three pairs of resistors/
A potentiometer is provided.

The differential pressure simulator 67 connects the terminal T25 of the end block 66
- Connected to T37. In operation, when potentiometers 68-70 are adjusted, the RVLIS produces 30 volts, and the current flows through potentiometers 68-70.
varies between 2 and 23 milliamps.

FIG. 4 further shows a wide range pressure sensor simulator 74 connected to the power source 61 to simulate the wide range pressure sensor 25 (FIG. 1). The wide range pressure sensor simulator consists of a 200 ohm resistor 75 connected to a power supply 61.
and a 1 kilohm holdable potentiometer 76 connected between the 200 ohm resistor and the terminal block 66 within the measurement system 10. Terminal T40~T
The connection of simulator 74 to 42 is through terminal block 66
includes a connection to the shield terminal (S) of the
Connect the wiper arm of potentiometer 76 to the positive terminal (+
). 8 bit
Westinghouse RV based on microprocessor
Terminal block 66 within the LIS is terminal block 106. In operation, when the potentiometer 76 is adjusted a signal similar to that generated by the temperature hot simulator 60 is generated.
19 conductor wire cables containing connectors
It is used to connect the temperature hot simulator 6o, the differential pressure cell simulator 67 and the wide range pressure sensor simulator 74 to the measurement system 10. A military retainable connector may be used on the test tool 40 side.

5 to 7 show how the measurement system 10 is connected to different simulators to allow visual confirmation of the values of the signals being input to it. The meter is
Must always be connected between TE, <10> and negative (-) conductor. 13 between the meter and the various simulators to connect the meter 77 to the appropriate simulator.
A position selectable switch may be provided. Alternatively,
Banana plugs may be used to connect meter 77 to a suitable simulator. Meter 77 may be a standard off-the-shelf meter capable of measuring milliamp current, resistance varying between zero and approximately 15 kilohms, and voltage varying from zero to 15 volts. Two volt meters 77 should be provided so that at least two signals can be monitored simultaneously.

FIG. 8 shows the resistance temperature detector simulator portion of test tool 40 for the 16-bit microprocessor based metrology system RVLIS-86. Potentiometers 42-48 are the same as shown in FIG. However, potentiometers 42-48 are connected to terminal blocks 112 and 113 within RVLIS-86.

FIG. 9 shows pump condition simulator switches 51 to 5.
4 and isolator excess range limit switches 57-59 to terminal T on terminal block 118 of the RVLIS-86.
2 to 723 are shown.

FIG. 10 shows a power supply 61, resistors 62, 63 and 75, and potentiometers 64, 65 and 76, simulating a temperature hot sensor and a wide range pressure sensor.
-86 is connected to the terminals T2 to T9 on the terminal block 111.

FIG. 11 shows potentiometers 68-70 and resistors 71-72 to simulate differential pressure sensors and how they are connected to terminals T2-T9 on terminal block 110 of RVLIS-86. It shows how.

As described for the 8-bit RVLIS, the RVL
Connection of the potentiometer wiper arm conductor of the IS-86 test tool to the appropriate terminals must be modified to ensure proper operation of the test tool. RVL
When visual confirmation of the output of the I5-86 test tool 40 is required, meters 77 may be connected to the various potentiometers in a manner similar to that shown in FIGS. 5-7.

The resistors and potentiometers in the RVLIS-86 test tool do not need to be precision elements, and the terminations of all wires on the measurement system side should be spade rack connections for ease of use. On the other hand,
Military connectors may be used on the test tool side.

As shown in the various figures, this test tool makes it possible to simulate all input signals to the reactor vessel level measurement system of a light water pressurized reactor throughout their range, and therefore: Allows experienced personnel to test the system or allows operator training.

When connecting test equipment to the RVLIS, the RVLIS device must be de-energized. r (To replace the field wires to the VLIS with the test tool input, the test tool operator must first identify on the test tool the terminal strip shown in the wire connection diagram in the associated figure. The terminal block is located at the rear of the local display cabinet. The appropriate field wire connections are removed from the terminal board and the test equipment is connected to the designated terminals. Once the terminal connections are secured, The power supply within the test tool is then plugged in and energized.During operation, the skilled person will be able to see the associated measured value changes on the local display 31 as input value changes and the corresponding responses at the container level associated with the input value changes. When the skilled person wishes to check the value of the output signal, the meter 77 can be connected to a suitable simulator circuit.For example, if the value simulating the resistance temperature changes When done, this change should be shown on the local display.

However, the display related to the actual reactor vessel fluid level should not change. If a hydraulic isolator overrange limit signal is simulated, an alarm should appear on both local display 31 and remote display 30. Whenever a differential pressure cell is simulated, the local display should show a change in the value of the pressure cell signal and a change in the reactor fluid level, and the remote display 30 should show only the change in the reactor fluid level. It should show. If a skilled person desires to verify proper operation of remote display 30, extra remote displays can be jumpered in the instrumentation system cabinet.

The many features and advantages of this invention will be apparent from the foregoing description, and it is therefore intended that the appended claims cover all features and advantages of the testing device that are within the spirit and scope of this invention. Since many further modifications and changes will readily occur to those skilled in the art, this invention
There is no desire to be limited to the construction and operation exactly shown and described, and all suitable modifications and equivalents falling within the scope of the invention may therefore be encompassed.

[Brief explanation of drawings]

FIG. 1A is a block diagram illustrating a reactor vessel level monitoring system, and FIG. 1B is a block diagram of a reactor vessel level monitoring system shown in FIG. 1A for monitoring reactor coolant fluid levels. A block diagram showing the container level measurement system, FIG. 2 shows the resistance temperature detector simulator 41.
FIG. 3 is a wiring diagram showing how the resistance temperature detector simulator is connected to an 8-bit microprocessor-based measurement system.
and isolator overrange limit simulator 56, and the 8-bit microprocessor of these simulators.
FIG. 4 is a wiring diagram showing how the base is connected to the measurement system.・Wiring diagrams showing how the base is connected to the measurement system, Figures 5 to 7 show the meter 77 for monitoring the value of the output signal.
are connected to the resistance temperature detector simulator 41, the temperature hot sensor simulator 60, the wide range pressure sensor simulator 74, and the differential pressure cell simulator 67, FIGS. , 16-bit microprocessor-based measurement system RV
In Figure 6, which is a wiring diagram showing the components and connections of the inspection tool for LIS-86, 10 is a reactor vessel level measurement system, 11 to 13 are differential pressure cells, 14 to 16 are hydraulic isolators, and 17 to 23 are resistors. Temperature detector, 24 pump status monitor, 25 wide range pressure sensor, 26 temperature hot sensor, 27 reactor containment wall, 28 reactor vessel, 29 reactor coolant pump, 3o remote display , 31 is a local display, 40 is a test tool, 41 is a resistance temperature detector simulator, 42 to 48 are potentiometers, 49 is a terminal block, 50 is a pump status simulator, 51 to 54 are pump status switches, 5
5 is a terminal block, 56 is an isolator overrange limit simulator, 57-59 are switches, 60 is a temperature hot sensor simulator, 61 is a power supply, 66 is a terminal block, 67 is a differential pressure cell simulator, and 74 is a wide range pressure sensor. - Simulator 77 is a meter. Patent applicant: Westinghouse Elec F/θ//
. Procedure amendment writing method) % formula % 1. Indication of the case Patent Application No. 33586 of 1988 2. Name of the invention Inspection tool for reactor vessel level measurement system 3. Person making the amendment Relationship to the case Name of the patent applicant ( 711) Westinghouse Electric Corporation 4, Agent address: 4th floor, Marunouchi Building, 2-4-1 Marunouchi, Chiyoda-ku, Tokyo 100 (No change)

Claims (5)

[Claims] (1) An inspection tool for a reactor vessel level measurement system, comprising: inspection signal supply means for supplying an inspection signal to the reactor vessel level measurement system; and confirmation means for confirming the value of the inspection signal. (2) The inspection signal supply means includes: variable resistance means for supplying a variable resistance to the reactor vessel level measurement system; connection means for returning a detection signal to the reactor vessel level measurement system; and the atom a variable voltage means for supplying a variable voltage to the reactor vessel level measurement system; the confirmation means is configured to measure the variable resistance or the variable voltage supplied to the reactor vessel level measurement system; a meter that can be switched and connected to either the variable resistance means or the variable voltage means; the variable resistance means includes a potentiometer that can be connected to the reactor vessel level measurement system; and the connection means is connected to the reactor vessel level measurement system. a switch connectable to the reactor vessel level measurement system, the variable voltage means comprising: a power source; a resistor connected to the power source; a potentiometer connected to the resistor and connectable to the reactor vessel level measurement system; An inspection tool for a reactor vessel level measurement system according to claim 1, comprising: (3) the reactor vessel level measurement system includes a temperature compensation system, a pump status system, a hydraulic isolator system, a temperature hot system, a differential pressure system, and a wide range pressure system; compensation test means for testing the temperature compensation system; pump condition test means for testing the pump condition system; isolator test means for testing the hydraulic isolator system; 1. A device according to claim 1, comprising: temperature testing means for testing the differential pressure system; pressure testing means for testing the differential pressure system; and wide range testing means for testing the wide range pressure system. Inspection tool for reactor vessel level measurement system. (4) the compensation testing means comprises means for supplying a variable voltage drop to the temperature compensation system; the pump condition testing means comprises means for transmitting a voltage therethrough; and the isolator testing means comprises means for transmitting a voltage therethrough, said temperature testing means comprises means for supplying a variable voltage to said temperature hot system, and said pressure testing means comprises means for transmitting a variable current to said differential pressure system. 4. The reactor vessel level measurement system of claim 3, further comprising means for supplying a variable voltage to the wide range pressure system, and wherein the wide range inspection means comprises means for supplying a variable voltage to the wide range pressure system. inspection tools. (5) The reactor vessel level measurement system is a reactor vessel level measurement system for a pressurized water reactor, and the reactor vessel level measurement system includes a temperature compensation subsystem receiving a resistance temperature detector signal and a pump status signal. a pump status subsystem that receives the isolator limit signal; a hydraulic isolator subsystem that receives the isolator limit signal; a temperature hot subsystem that receives the reactor coolant temperature signal; and a differential pressure cell subsystem that receives the differential pressure cell signal. a wide range pressure subsystem that receives a pressure signal, and is connectable to the temperature compensation subsystem to provide an alternative resistance temperature sensor signal and used to test the temperature compensation subsystem; a first potentiometer; a pump status switch connectable to the pump status subsystem for providing an alternate pump status signal and used to test the pump status subsystem; and a pump status switch for providing an alternate isolator limit signal. an isolator switch connectable to the hydraulic isolator subsystem and used to test the hydraulic isolator subsystem; a power source; and an isolator switch connected to the power source and providing an alternative reactor coolant temperature signal. a second potentiometer connectable to the temperature hot subsystem to test the temperature hot subsystem and used to test the temperature hot subsystem; and a second potentiometer connected to the differential pressure cell subsystem to provide an alternative differential pressure cell signal. a third potentiometer connected to the power supply and connectable to the wide range pressure subsystem to provide an alternative wide range pressure signal; and An inspection tool for a reactor vessel level measurement system according to claim 1, comprising: a wide range potentiometer used to inspect the wide range pressure subsystem.