JP4919791B2 - Core monitoring device - Google Patents

Description

  The present invention relates to a core monitoring device that monitors a reactor core that operates according to an operation plan.

  In a nuclear reactor, in general, an operation plan for obtaining a desired generator output is set, and the temporal change in core characteristics is predicted and calculated using a calculation model based on the operation plan and the core characteristic information at the time of the plan. Confirm. In order to monitor the reactor core that operates in accordance with this operation plan, for example, the actual value of the core characteristics is calculated based on the state quantity of the reactor core obtained from the detector or the like, and the operation limit value (for example, the maximum linear power density) There is known a monitoring device for monitoring so as not to reach a thermal limit value such as a minimum limit output ratio.

  Conventionally, for example, when the actual value (operation result data) deviates from the predicted value (operation plan data) of the core characteristics calculated at the time of setting the operation plan, it is determined that the re-planning of the operation plan is necessary, and an alarm signal is output. An apparatus provided with driving performance deviation determination means is disclosed (for example, see Patent Document 1). The operation performance deviation determination means includes a display means for displaying the predicted value of the core characteristic and the actual value in comparison, and an alarm signal when the deviation between the predicted value of the core characteristic and the actual value exceeds a predetermined limit value. And an evaluation means for generating data necessary for re-planning.

JP-A-8-166487 (pages 6 to 7, FIGS. 2 to 5)

However, there are the following problems in the above-described prior art.
That is, the display means of the above-mentioned prior art confirms the difference between the predicted value of the core characteristic and the actual value by displaying the predicted value of the core characteristic calculated at the time of setting the operation plan and the actual value. Is possible. However, although the predicted value of the core characteristics calculated at the time of setting the operation plan can be obtained, the predicted value to be corrected cannot be obtained due to the deviation of the actual value. In other words, for example, if the actual value of the core characteristics deviates from the predicted value, how should the future core characteristics change, how close it will be to the operating limit value, and whether it is better to change the operation plan early Accurate prediction judgment (predictive monitoring) such as whether or not must depend on, for example, the experience of the supervisor and is not easy.

  An object of the present invention is to provide a core monitoring apparatus capable of performing accurate prediction monitoring.

(1) In order to achieve the above object, the present invention provides a core monitoring device for monitoring a reactor core that operates according to an operation plan, obtains a state quantity of the reactor core, calculates a core characteristic, Core characteristic result data generating means for generating actual data, core characteristic result data storage means for storing core characteristic actual data generated by the core characteristic actual data generating means, current operation plan data and other operation plan data Operation plan data storage means for storing, input means capable of selecting at least one of the current operation plan data and other operation plan data stored in the operation plan data storage means, and the core characteristic result data storage when core characteristics actual data is stored in the means, the operation plan data selected by the stored latest core characteristics actual data and the input means A core characteristic prediction data generating means for predicting core characteristics over time by a calculation model based on the calculation model, and generating core characteristic prediction data; Data storage means; and display means for displaying core characteristic prediction data stored in the core characteristic prediction data storage means together with core characteristic result data stored in the core characteristic result data storage means.

(2) In order to achieve the above object, the present invention provides a core monitoring apparatus for monitoring a reactor core that operates according to an operation plan, obtains a state quantity of the reactor core, calculates core characteristics, Core characteristic result data generating means for generating characteristic result data, core characteristic result data storage means for storing core characteristic result data generated by the core characteristic result data generating means, current operation plan data and other operation plan data The operation plan data storage means for storing, the input means capable of selecting at least one of the current operation plan data and other operation plan data stored in the operation plan data storage means, and the core characteristic performance data Each time the core characteristic result data is stored in the storage means, the latest core characteristic result data stored and the operation plan data selected by the input means are stored. A core characteristic prediction data generating means for predicting a time-dependent change of core characteristics by a calculation model based on the above, and generating core characteristic prediction data, and a core characteristic storing the core characteristic prediction data generated by the core characteristic prediction data generating means Prediction data storage means, and display means for displaying core characteristic prediction data stored in the core characteristic prediction data storage means together with core characteristic performance data stored in the core characteristic performance data storage means.

(3) In the above (1) or (2) , preferably, determination means for determining whether or not a value representing a relationship between the core characteristic prediction data and a preset operation limit value exceeds a predetermined threshold value. The display means displays that the determination means determines that a predetermined threshold value has been exceeded.

  According to the present invention, accurate prediction monitoring can be performed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a functional configuration of an embodiment of a core monitoring apparatus of the present invention.

  In FIG. 1, a core monitoring device is for an operator (monitor) to monitor a nuclear reactor core (not shown) that operates according to an operation plan, for example, a core characteristic result calculating unit 1, a core characteristic, Results database 2, operation plan setting unit 3, operation plan database 4, core characteristic prediction calculation unit 5, core characteristic prediction database 6, input unit 7 that can be operated by the operator, display control unit 8, And a display unit (monitor) 9.

The reactor core performance calculation unit 1 calculates the reactor core properties based on, for example, the state quantity of the reactor core obtained from a detector or the like periodically (for example, every hour) or in response to an instruction input from the input unit 7. Core characteristic performance data (for example, date and time, generator output, core thermal output, core flow rate, control rod insertion pattern, maximum linear power density and its ratio to its limit value, minimum limit power ratio and its limit value) have created a data) including ratios, etc., adapted to store the core characteristics actual data this creates core characteristics real 績De database 2 for.

  The operation plan setting unit 3 creates, for example, operation plan data for obtaining a desired generator output (specifically, data including generator output, core heat output, core flow rate, control rod insertion pattern, etc.). The created operation plan data is stored in the operation plan database 4. The operation plan database 4 of the present embodiment stores not only the current operation plan data but also a plurality of other operation plan data.

  For example, every time the core characteristic result data is stored in the core characteristic result database 2 (or every predetermined number of times), the core characteristic prediction calculation unit 5 stores the latest core characteristic result data and the operation plan database 4 stored therein. Set by a calculation model based on the operation plan data stored in (for example, generator output, core heat output, core flow rate, control rod insertion pattern, etc.) The time period change of the core characteristics in the input period, for example, about 1 to 2 months) is predicted and calculated. Note that the operation plan data used for the prediction calculation is selected by at least one of the current operation plan data and other operation plan data stored in the operation plan database 4 according to the setting input at the input unit 7. It has come to be. The control procedure of the core characteristic prediction calculation unit 5 will be described with reference to FIG. FIG. 2 is a flowchart showing the contents of the control processing of the core characteristic prediction calculation unit 5.

  In FIG. 2, first, in step 100, it is determined whether or not the core characteristic result data has been updated based on the information in the core characteristic result database 2, for example. For example, when the core characteristic performance data is not updated, the determination in step 100 is not satisfied, and this procedure is repeated. On the other hand, for example, when the core characteristic performance data is updated, the determination in step 100 is satisfied, and the routine proceeds to step 110.

  In step 110, the latest core characteristic result data is read from the core characteristic result database 2, the process proceeds to step 120, and the operation plan data set and input by the input unit 7 is read from the operation plan database 4. Then, the process proceeds to step 130, and the time-dependent change of the core characteristics in a predetermined period is predicted and calculated from the time of the read core characteristics actual data as a starting point, using a calculation model based on the read core characteristics actual data and operation plan data. Then, the process proceeds to step 140, where core characteristic prediction data (specifically, part of the operation plan data input to the calculation model is also included. For example, the start time and end time of the prediction period, the change over time in the generator output, the core heat, Includes time-dependent change in power, time-dependent change in core flow rate, time-dependent change in control rod insertion pattern, time-dependent change in maximum linear power density and its ratio to its limit value, time-dependent change in minimum limit power ratio and its ratio to its limit value, etc. Data) is generated and stored in the core characteristic prediction database 6. When there are a plurality of operation plan data set and input by the input unit 7, the above-described steps 110 to 140 are repeated for each operation plan data.

  The display control unit 8 reads the latest core characteristic result data stored in the core characteristic result database 2 and the core characteristic prediction data stored in the core characteristic prediction database 6 and displays them according to the operation input from the input unit 7. The screen display of the unit (monitor) 9 is controlled. FIG. 3 is a diagram illustrating an example of a monitoring screen displayed on the display unit 9.

In FIG. 3, the monitoring screen 10 includes a current monitoring area 10a for displaying core characteristic performance data and a predicted monitoring area 10b for displaying core characteristic prediction data. The current monitoring area 10a includes the date and time, the generator output at that date and time, the core thermal output, the core flow rate, the maximum linear power density and its ratio to the limit value (MFLPD, operation limit less than 1.0 if it is within the operation limit value). An index value that approaches 1.0 as the value approaches, and a minimum limit output ratio and a ratio to the limit value (MFLCPR, an index that approaches 1.0 as the operation limit value is smaller than 1.0 if it is within the operation limit value) Value) etc. are displayed. In the prediction monitoring area 10b, the type (scenario) of the operation plan, the start time and end time of the prediction period, the maximum value of MFLPD and the maximum value of MFLCPR in the prediction period are displayed.

  Further, the display control unit 8 has a function of determining whether or not a predetermined threshold value set in advance is exceeded with respect to the maximum value of MFLPD and the maximum value of MFLCPR. For example, when the predetermined threshold value is not exceeded, “---” is displayed in the prediction information column of the prediction monitoring area 10b. On the other hand, when the predetermined threshold value is exceeded, “---” is displayed in the prediction information column 10b. "Limit value margin reduction" is displayed. Thus, for example, when “reduced limit value margin” is displayed in the current operation plan, the operator can determine that the current operation plan should be changed. "Is displayed, the operator can determine that the operation plan should not be changed.

  Further, the display control unit 8 causes the display unit 9 to display a prediction detail screen for displaying details of the core characteristic prediction data in accordance with an operation input from the input unit 7. FIG. 4 is a diagram illustrating an example of a prediction detail screen displayed on the display unit 9, and FIG. 5 is a diagram illustrating another example of the prediction detail screen displayed on the display unit 9.

  The prediction detail screen 11 shown in FIG. 4 is a screen that displays a core characteristic prediction value at an arbitrary prediction time (for example, a time input by the input unit 7). The type of operation plan, the start time of the prediction period, and The predicted time, generator output, core thermal power, core flow rate, maximum linear power density and ratio to limit value (MFLPD), minimum limit power ratio and ratio to limit value (MFLCPR) at the predicted time are displayed. . Further, in the control rod display area 11a of the prediction detail screen 11, the insertion depth of the control rod at the prediction time (indicated by “N” in FIG. 4) is displayed for each core area, and the power distribution display area 11b Shows the power distribution in the core axis direction at the predicted time.

  The prediction detail screen 12 shown in FIG. 5 is a screen for displaying the change with time of an arbitrary core characteristic prediction value in an arbitrary operation plan up and down, and the operation plan and core characteristics (in FIG. The generator output and MFLPD are illustrated as a function of time).

  In the present embodiment configured as described above, the operator can monitor the reactor core by confirming the core characteristic performance data by using the monitoring display area 10a of the monitoring screen 10 displayed on the display unit 9, for example. it can. Further, for example, when the setting is input by the input unit 7 with the intention of predicting a change in the core characteristics with time in the current operation plan, the prediction monitoring area 10b of the monitoring screen 10 includes the core characteristic prediction data in the current operation plan. Is displayed. This core characteristic prediction data is different from the numerical value calculated at the time of setting the operation plan, and is a highly accurate numerical value calculated based on the latest core characteristic actual result data, so the operator can perform accurate prediction monitoring. it can. In other words, make predictions such as how the core characteristics change when operating with the current operation plan, how close the operating limit is, and whether it is better to change the operation plan early. Can do.

Also, for example, if you set input by the input unit 7 is intended to predict the time course of the core characteristics when changed to another operation plan, the prediction monitoring region 10b of the monitoring screen 10, other operation plan The core characteristic prediction data at is displayed. Thus, for example, comparing the core characteristics prediction data in the core characteristic prediction data and other operation plan in current operation plan can be performed accurately in determining whether to change the operation plan. Also, for example, when viewing the core characteristics prediction data in other operation plan of plurality predictive monitoring region 10b of the monitoring screen 10, in comparison with those core characteristics forecast data, that should be changed operation plan determination aid It can be. Further, for example, by displaying the predicted detail screen 11 or 12 on the display unit 9, can confirm the details of the core characteristics prediction data, it is possible to help the judgment to be changed operation plan.

  For example, if the type of operation plan is set and input in advance by the input unit 7, the core characteristic prediction calculation unit 5 receives the latest core characteristic result data and settings every time the core characteristic result data is updated. The core characteristic prediction data is stored in the core characteristic database 6 by predicting and calculating the time-dependent change of the core characteristics using the calculation model based on the operation plan data, and the display control unit 8 is displayed on the monitoring screen 10 of the display unit 9. Since the core characteristic prediction data to be displayed is automatically updated, the burden on the operator can be reduced.

  In the above-described embodiment, the monitoring screen 10 that displays the core characteristic prediction data together with the core characteristic result data has been described as an example. However, the present invention is not limited to this, and for example, a screen that displays only the core characteristic result data and the core characteristic prediction It may be divided into a screen for displaying data and switched according to an operation input at the input unit 7. In this case, the same effect as described above can be obtained.

Further, in the above one embodiment, predictive monitoring region 10b of the monitoring screen 10, the ratio (MFLPD) to the maximum linear heat generation ratio, and its limit value, and displays the ratio (MFL CPR) to the minimum critical power ratio and limit values Although the case has been described as an example, the present invention is not limited to this. That is, instead of this, for example, the maximum line power density, the line power density, the minimum limit power ratio, and the limit power ratio may be displayed. Further, other core characteristics such as a stability reduction ratio may be displayed. In these cases, the same effect as described above can be obtained.

  Further, in the above embodiment, the functional configuration of the core monitoring device is described with reference to FIG. 1 and no specific device configuration is mentioned. For example, as shown in FIG. A monitoring calculation device 13 having a characteristic result database 2, the operation plan setting unit 3, an operation plan database 4, a core characteristic prediction calculation unit 5, and a prediction calculation device 14 having a core characteristic prediction database 6, the input unit 7, The display control unit 8 and the display device 15 having the display unit 9 may be provided, and the monitoring calculation device 13, the prediction calculation device 14, and the display device 15 may be connected via a LAN 16 or the like so as to be able to perform data communication with each other. Good. In this case, since the monitoring calculation device 13 having the core characteristic performance calculation unit 1 and the prediction calculation device 14 having the core characteristic prediction calculation unit 5 are separated, it is possible to shorten the time for prediction calculation.

It is a block diagram showing the functional structure of one Embodiment of the core monitoring apparatus of this invention. It is a flowchart showing the control processing content of the core characteristic prediction calculating part which comprises one Embodiment of the core monitoring apparatus of this invention. It is a figure showing an example of the monitoring screen displayed on the display apparatus which comprises one Embodiment of the core monitoring apparatus of this invention. Is a diagram illustrating an example of a prediction details screen displayed on the display device which constitutes one embodiment of a core monitoring device of the present invention. It is a diagram illustrating another example of the prediction details screen displayed on the display device which constitutes one embodiment of a core monitoring device of the present invention. It is a block diagram showing the apparatus structure of one Embodiment of the core monitoring apparatus of this invention as an example.

Explanation of symbols

1 Core Characteristic Result Calculation Unit (Core Characteristic Result Data Generation Means)
2 Core characteristics results database (core characteristics results data storage means)
4 Operation plan database (operation plan data storage means)
5 Core characteristics prediction calculation unit (core characteristics prediction data generation means)
6 Core specific prediction database (core characteristic prediction data storage means)
7 Input section (input means)
8 Display controller (determination means)
9 Display section (display means)

Claims (3)

In the core monitoring device that monitors the reactor core that operates according to the operation plan,
Obtaining the state quantity of the nuclear reactor core, calculating the core characteristics, and generating core characteristic result data generating means;
Core characteristic result data storage means for storing core characteristic result data generated by the core characteristic result data generation means;
Operation plan data storage means for storing current operation plan data and other operation plan data;
Input means capable of selecting at least one of the current operation plan data and other operation plan data stored in the operation plan data storage means;
When the core characteristic result data is stored in the core characteristic result data storage means, the change in the core characteristics with time is calculated by a calculation model based on the latest core characteristic result data stored and the operation plan data selected by the input means. A core characteristic prediction data generating means for performing prediction calculation and generating core characteristic prediction data;
Core characteristic prediction data storage means for storing core characteristic prediction data generated by the core characteristic prediction data generation means;
A core monitoring apparatus comprising: display means for displaying core characteristic prediction data stored in the core characteristic prediction data storage means together with core characteristic result data stored in the core characteristic result data storage means. In the core monitoring device that monitors the reactor core that operates according to the operation plan,
  Obtaining the state quantity of the nuclear reactor core, calculating the core characteristics, and generating core characteristic result data generating means;
  Core characteristic result data storage means for storing core characteristic result data generated by the core characteristic result data generation means;
  Operation plan data storage means for storing current operation plan data and other operation plan data;
  Input means capable of selecting at least one of the current operation plan data and other operation plan data stored in the operation plan data storage means;
  Each time core characteristic performance data is stored in the core characteristic performance data storage means, the core characteristics change over time by a calculation model based on the latest core characteristic performance data stored and the operation plan data selected by the input means. A core characteristic prediction data generation means for predicting and generating core characteristic prediction data;
  Core characteristic prediction data storage means for storing core characteristic prediction data generated by the core characteristic prediction data generation means;
  A core monitoring apparatus comprising: display means for displaying core characteristic prediction data stored in the core characteristic prediction data storage means together with core characteristic result data stored in the core characteristic result data storage means. In the core monitoring apparatus according to claim 1 or 2 ,
A determination means for determining whether or not a value representing a relationship between the core characteristic prediction data and a preset operation limit value exceeds a predetermined threshold;
The core monitoring apparatus, wherein the display means displays that the determination means determines that a predetermined threshold value has been exceeded.

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