JP3864023B2 - Reactor power monitoring method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reactor power monitoring method and apparatus for monitoring a reactor power by measuring a neutron flux in the reactor.
[0002]
[Prior art]
In general, in boiling water reactors, the neutron flux in the reactor is detected by a local output detector such as an ionization chamber detector, and the reactor output is measured. A plurality of local power detectors are arranged in the reactor core at predetermined intervals in the vertical direction. Usually, four local output detectors are arranged in the vertical direction, and this is called a detector assembly.
[0003]
Conventionally, in order to monitor the reactor output, the detection signal (neutron signal) of the local output detector is compared with a plurality of preset values, and an alarm is generated when the reactor output signal (neutron signal) reaches the set value. I am doing so. As the plurality of set values, there are combinations of “output low” and “output high” or “output low”, “output high”, and “output high”.
[0004]
Conventionally, when the reactor power reaches a set value, a character of the corresponding set value, for example, “output height” is displayed as a warning in a single color on a display device such as electroluminescence.
[0005]
The operator alerts when “output low” is displayed as an alarm, performs an output reduction operation at “output high”, and performs an emergency operation at “output high”.
[0006]
[Problems to be solved by the invention]
Conventionally, when the reactor power reaches the set value, the character of the corresponding set value is displayed in a single color alarm, but the character of the set value that is not normally displayed is suddenly displayed in a single color. There is a problem that it is difficult to accurately grasp the occurrence state instantly.
[0007]
In particular, it is extremely difficult for an unskilled operator to grasp the alarm generation state of the reactor power instantaneously and accurately.
[0008]
For this reason, in order to improve the reliability of reactor operation, there is a strong demand for the development of a technology that can instantly and accurately grasp the alarm generation state of the reactor output.
[0009]
The present invention has been made in response to the above-mentioned points, and an object of the present invention is to provide a reactor power monitoring method and apparatus capable of quickly and accurately grasping the alarm generation state of the reactor power. is there.
[0010]
[Means for Solving the Problems]
A feature of the present invention is that characters indicating a plurality of set values are always displayed on the display device at normal times, and when the reactor power reaches the set values, the characters indicating the corresponding set values are different from those at normal times. It is to be displayed. In other words, characters indicating a plurality of set values are displayed even during normal times, and characters indicating the corresponding set values are identified and displayed when an alarm occurs.
[0011]
In a preferred embodiment of the present invention, the background color of the area for displaying the character indicating the set value and the character are color-changed and displayed.
[0012]
Since the present invention displays the characters of multiple set values of the reactor output, that is, the alarm items of the reactor output even during normal times, the alarm items can always be recognized and the alarm occurrence status can be quickly and accurately detected when an alarm occurs. I can grasp it.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of the present invention.
[0014]
In FIG. 1, a large number of detector assemblies 4 having four local output detectors 3 arranged at predetermined intervals in the vertical direction are provided in a core 2 of a nuclear reactor (containment vessel) 1. About 52 detector assemblies 4 are dispersed and installed.
[0015]
The neutron signal detected by the local power detector 3 is input to the signal processing unit 51 of the reactor power processing device 5. The signal processing unit 51 performs range limiting processing, filtering processing, and the like on the input neutron signal (reactor output signal).
[0016]
The alarm processing unit 52 obtains the reactor output representing the thermal output of the reactor 1 based on the detection signal of the local output detector 3 given from the signal processing unit 51, and determines the alarm state. The reactor power and alarm status obtained by the alarm processor 52 are output to a display device 55 that displays them in numerical values, bar graphs, graphics, and the like. A flat display is used as the display device 55.
[0017]
The detection signal of the local output detector 3 and the reactor output signal obtained by the alarm processing unit 52 are sent by the transmission device 53 to a process computer (not shown) through a transmission line.
[0018]
The reactor power monitoring device 5 has a calibration device 54 that is calibrated by a touch operation of the display device 55 by an operator. In addition, the operator can set the set value for reactor power monitoring by touching the display device 55.
[0019]
FIG. 2 shows an example detailed configuration diagram of the alarm processing unit 52.
[0020]
In FIG. 2, the reactor output calculation unit 21 obtains the reactor output based on the neutron signal from the signal processing unit 51. The alarm determination unit 22 compares the reactor power obtained by the reactor power calculation unit 21 with a plurality of set values set by the setting unit 25. The set value set by the setting unit 25 includes “output low”, “output high” or a combination of “output low”, “output high”, and “output high”. Usually, in the case of the reactor output based on the detection signal of one local power detector 3, the former two set values are given, and in the case of the reactor power obtained from the detection signals of all the local power detectors 3. Are given the latter three setting values.
[0021]
The alarm state processing unit 23 inputs the result of the comparison process of the alarm determination unit 22 and outputs an alarm state in accordance with a data format necessary for appropriate display on an alarm output display window (area) displayed on the display device 55. Process to set.
[0022]
The alarm state processing unit 23 displays an alarm on the alarm output display window of the display device 55 in order to display a normal state (no trip), an alarm factor occurrence time (trip occurrence) and an alarm occurrence factor release time (trip memory). The alarm state output display pattern C1 as shown in FIG. 3, for example, is configured by the data when the factor is generated (trip is occurring) and the data when the alarm factor is canceled (in the trip memory).
[0023]
As shown in Fig. 3, the alarm status output display pattern C1 shows that when both the alarm factor occurrence (trip occurrence) and alarm release factor release (trip memory) data are satisfied at the same time, the alarm factor occurrence (trip occurrence) The middle display is given priority.
[0024]
The screen data editing unit 24 inputs the data constituting the display pattern set by the alarm state processing unit 23, the reactor output obtained by the reactor output calculation unit 21 and the set value of the setting unit 25, and outputs them to the display device 55. The screen display output data D1 is edited and output to the table shown in FIG.
[0025]
Hereinafter, the operation will be described focusing on an example of a display screen displayed on the display device 55 which is a feature of the present invention. In addition, an example is shown in which the setting unit 25 uses “output low”, “output high”, and “output high / high” as set values.
[0026]
FIG. 5A shows a screen example of the reactor power monitoring screen in a state without alarm output, and FIG. 5B shows alarm display data at that time.
[0027]
As shown in FIG. 5 (a), on the screen 5A of the display device 55, the characters "reactor output", "reactor output low set value", "reactor output high set value", and "reactor output high set value" are displayed. Is displayed, and each numerical value is displayed as a percentage on the right side. The background of the screen 5A is black, and the characters and numerical values are displayed in green.
[0028]
In addition, a bar graph 5B is displayed on the screen 5A so that the operator can easily monitor the set value serving as a criterion for determining the alarm output by comparing the reactor output at that time with the set value (indicated by an arrow). . The bar graph 5B is displayed in green.
[0029]
In the alarm output display window (alarm display area) 5C, a “output low” character is displayed to indicate that the reactor output has become smaller than the set value. In the alarm display area 5D, the reactor output is set to the set value “output”. “Power high” is displayed to indicate that “high” has been exceeded, and the reactor output exceeds the set value “power high” in the alarm display area 5E with a value larger than the power high set value. Is displayed.
[0030]
The borders of the alarm display areas 5C, 5D, and 5E and the alarm items “output low”, “output high”, and “output high / high” are displayed in green.
[0031]
The operation switch 5F displayed at the lower left of the screen 5A is operated by a touch operation, and a confirmation reset character is displayed. The background in the frame of the operation switch 5F is displayed in blue, and the text “Confirmation reset” is displayed in black.
[0032]
Figure 5 shows that the reactor output is not a value that outputs an alarm even for the set values "Output Low", "Output High", and "Output High", so all alarm status display windows (alarm display areas) 5C, 5D, and 5E indicate that no alarm is generated and display a normal state (no trip). At this time, the frame lines of the alarm display areas 5C, 5D, and 5E and the characters “output low”, “output high”, and “output high / high” that are alarm items are displayed in green.
[0033]
FIG. 5 shows a state in which no alarm is generated with respect to the reactor output to be monitored, but alarm status display windows 5C, 5D, and 5E corresponding to the number of setting values (alarm items) to be monitored are provided. From this screen, the operator can easily recognize what alarm items are present for the reactor power.
[0034]
6 shows the same reactor power monitoring screen as in FIG. 5. Since the reactor power rose and exceeded the reactor power high set value from the state where no alarm was generated (no trip), “power high” and “ An example of a screen when an alarm of “output high / high” occurs is shown.
[0035]
When the reactor output rises and exceeds the reactor output height setting value, the alarm determination unit 22 shows the output when the alarm factor of “output height” and “output height” is generated (trip occurrence), as shown in FIG. When it is determined that the alarm display data is established, the alarm status processing window 23 (areas) 5D and 5E of the alarm value setting values “output high” and “output high” that are the alarm items in the alarm status processing unit 23 (trip occurrence) Set the pattern to display (middle).
[0036]
As a result, the alarm display areas 5D and 5E displayed on the screen 5A of the display device 55 are displayed during trip occurrence, the background of the alarm display areas 5D and 5E is displayed in red, and “output high” and “output high / high” are displayed. The letter is displayed in yellow. This display state is maintained until the reactor power decreases.
[0037]
FIG. 7A shows an example of a screen when the reactor power is lowered and the alarm status of “power high” and “power high” is changed from the trip occurrence display to the trip memory display.
[0038]
In the screen example of FIG. 7 (a), after the “output high” and “output high” alarms shown in FIG. 6 are generated, the reactor output decreases due to the operation by the operator. Shows a smaller state.
[0039]
In this state, the alarm determination unit 22 indicates that both the “output high” and “output high / high” data are established when the alarm generation factor is released (in the trip memory) as shown in FIG. It is determined that the data at the time of alarm factor occurrence (trip occurrence) is not established.
[0040]
The alarm status processing unit 23 has a pattern for displaying the alarm occurrence factor release time (in trip memory) for each alarm, and the alarm status display windows 5D and 5E of “output high” and “output high” are in the trip memory. Display. The background of the alarm status display windows 5D and 5E is displayed in green, and the characters “output height” and “output height” are displayed in red.
[0041]
In this way, when an alarm factor occurs (when a trip occurs), the background of the alarm display areas 5D and 5E is displayed in red and the alarm item character is displayed in yellow as described with reference to FIG. When the display color is changed depending on the alarm occurrence status, such as displaying the background in green and the alarm item characters in red, the operator recognizes which alarm occurred when the operator looks at the screen. Can be easily performed.
[0042]
FIG. 8A shows an example of a screen when an “output low” alarm is generated.
[0043]
In the screen example of FIG. 8A, when the alarm status of “power high” and “power high” shown in FIG. 7 is displayed in the trip memory, the reactor power further decreases and the reactor power low setting value Shows a smaller state.
[0044]
As in the “output high” and “output high / high” determination processing, the alarm determination unit 22 establishes the alarm display data when the “output low” alarm factor occurs (trip occurrence) as shown in FIG. Is determined. The alarm state processing unit 23 sets a pattern for displaying an alarm factor occurrence (trip occurrence) on the “output low” alarm state display window 5C, and the “output low” alarm state display window 5C is tripping. Display in yellow.
[0045]
In the screen of FIG. 8 (a), the alarm status display when the “output high” and “output high” alarm factors occur (trip occurrence) shown in FIG. 6 and the “output low” alarm factor occurrence (trip occurrence) The display color is different from the alarm status display in (Middle).
[0046]
This means that the “output high” and “output high / high” alarms are important alarm items related to scram signals and the like, and “output low” means that the importance of the alarm information is different. Therefore, by distinguishing the display color of the alarm state by color, it is easy for the operator to recognize the difference in the importance of the generated alarm.
[0047]
FIG. 9A shows an example of a screen when the “output high” alarm is generated again.
[0048]
The screen example of FIG. 9A shows a state in which the reactor output increases after the “low output” alarm is generated as shown in FIG.
[0049]
At this time, the warning determination unit 22 determines that the data at the time of occurrence of the “output high” alarm factor (trip occurrence) is established. Then, since the data at the time of canceling the alarm occurrence factor of “output high” (in the trip memory) remains held at the time of FIG. 7, the alarm is displayed as the alarm display data of FIG. 9B. Both the data when the factor occurs (during trip occurrence) and the alarm generation factor release (during trip memory) are satisfied at the same time. In this case, priority is given to the display when an alarm factor occurs (trip is occurring).
[0050]
When FIG. 9A is displayed on the screen 5A of the display device 55, if the operator touches the “confirm reset” operation switch 5F on the screen and performs the alarm output confirmation reset operation, the alarm state is displayed. The processing unit 23 makes the data not established when the alarm generation factor is canceled (in the trip memory) for all the alarm items on the screen to be displayed. Therefore, the alarm status display of “output low” and “output high / high” is a normal display (no trip).
[0051]
However, the “output high” data is established during alarm factor generation (trip occurrence), and does not become unsatisfied by the confirmation reset operation by the operator. Therefore, the alarm status display of “output high” is maintained while the alarm factor is being generated (trip is being generated). In other words, distinguishing the display colors according to the state of occurrence of such an alarm facilitates the operator's determination as to which alarm the confirmation reset operation is effective for.
[0052]
In this way, reactor power is monitored, but characters that indicate multiple set values (alarm items) are always displayed on the display device at normal times, and when the reactor power reaches the set value, the corresponding setting is displayed. Characters indicating the value are displayed in a different form from the normal time. In other words, characters indicating a plurality of set values are displayed even during normal times, and characters indicating the corresponding set values are identified and displayed when an alarm occurs. Therefore, it is possible to always recognize the alarm item and to quickly and accurately grasp the alarm occurrence state when the alarm is generated.
[0053]
In the above-described embodiment, the background color and the character of the area for displaying the character indicating the set value are displayed in different colors, so that the visibility of the operator is improved and the identification display can be easily performed. it can.
[0054]
【The invention's effect】
Since the present invention displays the characters of multiple set values of the reactor output, that is, the alarm items of the reactor output even during normal times, the alarm items can always be recognized and the alarm occurrence status can be quickly and accurately detected when an alarm occurs. I can grasp it.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of the present invention.
FIG. 2 is a detailed configuration diagram of an example of an alarm processing unit according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram of an alarm state output display pattern according to the present invention.
FIG. 4 is an explanatory diagram of screen display output data according to the present invention.
FIG. 5 is an explanatory diagram of a reactor power monitoring screen according to the present invention.
FIG. 6 is an explanatory diagram of a reactor power monitoring screen according to the present invention.
FIG. 7 is an explanatory diagram of a reactor power monitoring screen according to the present invention.
FIG. 8 is an explanatory diagram of a reactor power monitoring screen according to the present invention.
FIG. 9 is an explanatory diagram of a reactor power monitoring screen according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Reactor (containment vessel), 2 ... Core, 3 ... Local output detector, 4 ... Detector assembly, 5 ... Reactor output monitoring device, 51 ... Signal processing part, 52 ... Alarm processing part, 53 ... Transmission Device 54 ... calibration device 55 ... display device

Claims (6)

The reactor output is monitored by displaying on the display device that the set value is set for each of the three alarm items of “output low”, “output high” and “output high / high”. Three alarm display areas corresponding to the three alarm items are provided on the display screen of the apparatus, the alarm items corresponding to the respective alarm display areas are displayed in characters, and a bar graph of the reactor power is displayed on the same screen. In addition, the letters and background colors representing the alarm items in the three alarm display areas corresponding to the three alarm items are the normal state of the reactor output, and the alarm factor that causes the reactor output to be the set value of the alarm item. A reactor power monitoring method, characterized in that a different color is displayed in each state of a trip occurrence state at the time of occurrence and a trip memory state at the time of release of an alarm occurrence factor. 2. The reactor power monitoring method according to claim 1, wherein the alarm display area displaying the trip memory status is displayed with priority on the trip occurrence status when an alarm factor occurs. 2. The reactor power monitoring method according to claim 1, wherein the alarm display area displaying the trip memory state is displayed in a normal state by a confirmation reset operation of an operation switch displayed on the same screen. In the reactor power monitoring device that displays on the display device and monitors that the reactor power becomes a set value set for each of the three alarm items of “power low”, “power high” and “power high”, Reactor output detecting means for detecting the reactor output, and three alarm display areas corresponding to the three alarm items are displayed on the display screen of the display device, and the alarm items corresponding to the respective alarm display areas are displayed as characters. And alarm processing means for displaying a bar graph of the reactor power on the same screen, wherein the alarm processing means includes characters representing the alarm items in the three alarm display areas corresponding to the three alarm items; the background color, the normal state of the reactor power, the reactor power tripping during conditions when the alarm event occurs that reaches the set value of the alarm items, their in each state of the trip memory in a state at the time of alarm occurrence factor released Reactor power monitoring device and displaying color change in respective different colors. 5. The nuclear reactor according to claim 4, wherein the alarm display means preferentially displays the trip occurrence state in the alarm region when an alarm factor is generated in the alarm display region displaying the trip memory status. Output monitoring device. 5. The reactor output according to claim 4, wherein the alarm display means displays on the same screen an operation switch for confirming and resetting the alarm display area displaying the state in trip memory to display the normal state. Monitoring device.

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