JP3472614B2 - Method and apparatus for planning control rod drive mechanism long term inspection - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention optimizes the core arrangement of the control rod drive mechanism to be inspected in the planning of the inspection plan of the control rod drive mechanism (CRD) of a nuclear power plant.
The present invention relates to a control rod drive mechanism long-term inspection plan drafting method and device capable of leveling the number of control rod drive mechanisms to be inspected in a single periodic inspection.

[0002]

2. Description of the Related Art Conventionally, the planning of an inspection plan for a control rod drive mechanism of a nuclear power plant is judged by a specialist in design or maintenance based on various information gathering and analysis, experience and knowledge.

For example, a person who formulates an inspection plan collects and analyzes inspection and maintenance information necessary for evaluating the performance and deterioration of the control rod drive mechanism, and based on the expert's decision procedure and decision knowledge, A drive mechanism inspection plan is established.

[0004]

By the way, the performance of the control rod drive mechanism may differ from the initial situation due to various maintenance work such as deterioration over time or replacement of equipment and parts. An inspection plan established in the early stage of operation may show a large effect such as a decrease in operating rate and economic loss due to excessive maintenance, malfunctions, and increased failures.

Further, conventionally, the inspection work of the control rod drive mechanism is carried out individually for the control rod drive mechanisms extracted at random positions in the core arrangement, so that the work efficiency is lowered and the construction period is prolonged. In addition to the above, there was a problem that parallel work with other inspection and maintenance work was troublesome.

Furthermore, in the case of making changes such as extending the inspection cycle, it is necessary to establish a long-term inspection policy for the future, and in the conventional technique which is established for each specific periodic inspection, a large number of future periodic inspections are required. In some cases, it may be necessary to intensively inspect the control rod drive mechanism, or it may be irrational to diversify inspection points.

The present invention has been made under the above circumstances, and in the planning of the inspection plan of the control rod drive mechanism of a nuclear power plant, the core arrangement of the control rod drive mechanism to be inspected is optimized and at the same time. It is possible to equalize the number of control rod drive mechanisms to be inspected in regular inspections, thereby optimizing inspection costs, processes and workload, and contributing to improved reliability of control rod drive mechanisms and efficiency of maintenance work. In addition, by grouping the control rod drive mechanisms to be inspected on the core arrangement, it is possible to perform parallel work with other inspections and maintenance work such as refueling work performed at the same time in the periodic inspection, An object of the present invention is to provide a method and an apparatus for planning a long-term inspection of a control rod drive mechanism that can contribute to shortening the process of regular inspection.

[0008]

In order to achieve the above-mentioned object, a control rod drive mechanism long-term inspection planning apparatus according to the present invention has points of each control rod drive mechanism provided in a nuclear reactor.
For a plant that defines the inspection cycle as 5 cycles,
Change to increase the inspection cycle by 2 cycles or more
Is a method for planning a long-term inspection of the control rod drive mechanism.
Data for the core arrangement of the control rod drive mechanism and the number of uninspected operation cycles that have been operated after the previous inspection, and the control rod drive is performed by a division method in which a plurality of control rod drive mechanisms arranged in proximity are grouped. Inspection cycle after changing the mechanism
The above-mentioned unchecked operation cycle is divided into multiple groups
Most included control rod drive mechanism with the longest number
All control rod drive mechanisms of the group and
The smallest control rod drive mechanism has the longest number of icles.
The longest group and the number of uninspected operation cycles
Is the second control rod drive mechanism
Number of uninspected operation cycles included in each group
Control rod drive mechanism, which has the longest
It is characterized in that it is inspected at the same time by inspection and is set to be repeated in sequence .

In this case, the core arrangement of the control rod drive mechanism
Information input / output device for inputting / outputting the number of inspection operation cycles and other data and data regarding the subsequent inspection plan, an information recording / storing device for recording / saving the data, and a long-term inspection based on the data. It is desirable to include an information processing device that performs information processing regarding planning and an information display device that displays information regarding the planned long-term inspection plan.

Further, the control rod drive mechanism long-term inspection planning apparatus according to the present invention inputs and outputs data such as the core arrangement of the control rod drive mechanism, the number of operating cycles after inspection, and other data relating to the subsequent inspection plan. An information input / output device, an information recording / storing device for recording and storing the data, an information processing device for processing information on a long-term inspection plan based on the data, and a planned long-term inspection plan And an information display device for displaying information regarding the information.

[0011]

According to the present invention, in the preparation of the inspection plan for the control rod drive mechanism of a nuclear power plant, the core arrangement of the control rod drive mechanism to be inspected is optimized, and at the same time, the control rod drive mechanism to be inspected by one periodic inspection is The number can be equalized,
As a result, the inspection cost, the process and the work amount can be optimized, which can contribute to the improvement of the reliability of the control rod drive mechanism and the efficiency of the maintenance work.

Further, by grouping the control rod drive mechanisms to be inspected in the core arrangement, it is possible to perform a parallel work with other inspections and maintenance work such as refueling work performed at the same time in the periodic inspection, It can also contribute to shortening the process of regular inspection.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is applied to a control rod drive mechanism (CRD) of a boiling water reactor (BWR).

FIG. 1 shows a block configuration of an embodiment of the present invention.

Information and input / output device 2 for data and long-term inspection plan data prepared by the long-term inspection plan making device 1.
And an information record storage device 3 for the data and the long-term inspection plan data, and various data stored in the information record storage device 3 and a long-term inspection plan planning method 4a for a long-term inspection plan up to the inspection cycle destination. And an information display device 5 for providing various data stored in the information recording / storing device 3 and long-term inspection plan data etc. prepared by the information processing device 4.

FIG. 2 is a flow chart showing the procedure of the method of this embodiment.

In the present embodiment, first, as data necessary for preparing a long-term inspection plan, the core arrangement of the control rod drive mechanism and the number of operating cycles of the plant used after the previous inspection but not re-inspected (hereinafter, (Abbreviated as cycle after inspection)
To prepare.

Next, the inspection cycle number n of the control rod drive mechanism after the change (extension) is defined. Then, the core arrangement of the control rod drive mechanism is divided into n groups, and a control rod drive mechanism to be inspected up to n cycles ahead is selected to prepare a long-term inspection plan.
First, i = 1 is set, and the control rod drive mechanism to be inspected in the next periodical inspection is selected.

Here, all the control rod drive mechanisms of the group that includes the most control rod drive mechanisms that have the longest number of cycles after inspection, the least number of control rod drive mechanisms, and 2
The control rod drive mechanism of the longest post-inspection cycle included in the second smallest group is selected as the control rod drive mechanism to be inspected in the periodic inspection i cycles ahead. Then, the post-inspection cycle number of the selected control rod drive mechanism is set to "1", and the post-inspection cycle number of the remaining control rod drive mechanisms is increased by one. Also, i is incremented by 1.

This procedure is repeated until i> n. This makes it possible to sequentially select control rod drive mechanisms to be inspected up to i cycles later.

Next, the number of inspections Ci in each i cycle
And the standard inspection number N obtained by dividing the number of all control rod drive mechanisms by the inspection cycle n after the change, the deviation from the standard (this is used as an optimization index) x is calculated by the following formula.

[0022]

[Equation 1]

Then, in order to minimize the value of x,
Change the core grouping and repeat the above procedure. The selection result of the control rod drive mechanism to be inspected up to n cycles ahead obtained in the group division where x is the minimum is provided as an optimum long-term inspection plan.

The method of the present invention will be described below based on specific examples.

FIG. 3 shows the position of the control rod drive mechanism on the core arrangement of the BWR (one frame corresponds to one control rod drive mechanism), and the values in the frame are not checked after the previous inspection. The number of operating cycles of the plant used for (hereinafter, abbreviated as post-inspection cycle) is shown. Here, for example, the numerical value "5" in the frame
Indicates that the plant has been operated five times since the previous inspection. In the case of a plant in which the inspection cycle of the control rod drive mechanism is defined as 5 cycles, this control rod drive mechanism is to be inspected in the next regular inspection.

In the example of FIG. 3, the inspection cycle of the control rod drive mechanism is 5 cycles, and the control rod drive mechanism of a general plant has been inspecting the control rod drive mechanism at random positions in terms of the core arrangement. It shows an example of an inspection plan.

4 (1) to (8) show that the inspection cycle of the control rod drive mechanism is 5 cycles (equivalent to inspecting the control rod drive mechanism for each group in which the core arrangement is divided into 5).
It is a diagrammatic representation of the information processing procedure (algorithm) of the long-term inspection planning method when changing to 7 cycles (corresponding to inspecting the control rod drive mechanism for each group in which the core arrangement is divided into 7). The algorithm of the long-term inspection planning method will be described below with reference to FIG.

When the inspection cycle is changed (extended) as in this example, there is a possibility that each group includes the control rod drive mechanism which has passed 5 cycles since the previous inspection. In this case, as shown in (1) of FIG. 4, the control rod drive mechanism to be inspected in the first regular inspection after the cycle change is controlled by all the control rod drive mechanisms of the group A, for example, 5 cycles of the groups F and G. Select to perform the inspection of the control rod drive mechanism that has passed. However, the group A is the group with the most control rod drive mechanisms that have passed 5 cycles since the previous inspection , and the groups F and G have the least number of control rod drive mechanisms that have passed 5 cycles since the previous inspection. Select in order of group.

Next, as shown in FIG. 4 (2), the cycle after the inspection of the control rod drive mechanism selected in the above procedure is set to "1", and at the same time, other control rod drive mechanisms not selected are selected. Increase the cycle after inspection of by "1". That is, the cycle after the inspection of each control rod drive mechanism in the next regular inspection is set.

Thereafter, a long-term inspection plan of the control rod drive mechanism up to the inspection cycle destination after the change can be prepared by the same procedure.

For example, as shown in (2) of FIG. 4, the control rod drive mechanisms to be inspected in the second periodical inspection after the cycle change are controlled by all the control rod drive mechanisms of group B and, for example, 6 of groups D and F. Select to perform inspection of the control rod drive mechanism that has passed the cycle. However, here group B
Is the group with the largest number of control rod drive mechanisms after 6 cycles have passed since the previous inspection , and groups D and E are selected in the order of the group with the fewest control rod drive mechanisms after 6 cycles since the previous inspection .

Next, as shown in FIG. 4C, the cycle after the inspection of the control rod drive mechanism selected in the above procedure is set to "1" and at the same time, the other control rod drive mechanism not selected is selected. Increase the cycle after inspection of by "1". That is, the cycle after the inspection of each control rod drive mechanism in the next regular inspection is set.

By repeating the above procedure, a long-term inspection plan of the control rod drive mechanism up to the changed inspection cycle destination can be prepared.

5 (1) to (8) show that the inspection cycle of the control rod drive mechanism is 5 cycles (equivalent to inspecting the control rod drive mechanism for each group in which the core arrangement is divided into 5).
This is a diagram showing the procedure for formulating a long-term inspection plan when changing to eight cycles (equivalent to inspecting the control rod drive mechanism for each group where the core arrangement is divided into eight). It is shown that by applying the algorithm of the inspection planning method, a long-term inspection plan of the control rod drive mechanism can be prepared by the proposed long-term inspection planning method regardless of the way of changing the inspection cycle.

In this long-term inspection planning method, the plant to be applied either in the state of inspecting the control rod drive mechanism at a random position in the core arrangement or in the state of inspecting the control rod drive mechanism already grouped. However, it can be applied by simply changing the group setting method.

FIG. 6 shows an example of the screen of the information input / output device of the long-term inspection planning apparatus realized by using the long-term inspection planning method shown in FIGS. 4 and 5. That is,
This example is based on the control rod drive mechanism inspection plan data of the plant showing the post-inspection cycle and its core arrangement shown in FIG. 3 (the inspection cycle is 5 cycles and the core arrangement is random), and the inspection cycle is 7 cycles. Extended to (change)
In addition, a case will be described in which a long-term inspection plan is created when the core is divided into seven groups in a fan shape from the center of the core.

The screen on the left side of FIG. 6 shows the position of the control rod drive mechanism on the core arrangement of the BWR (one frame indicates the control rod drive mechanism 1).
(Equivalent to a stand), and the figures in the boxes indicate the number of cycles since the previous inspection. This cycle data can be displayed in an interactive format on this screen by instructing the frame on the screen with an input device such as a mouse using the information input / output device of the long-term inspection planning device and inputting numerical values with an input device such as a keyboard. Thus, after the cycle after the previous inspection, or the number of groups to be divided, etc. can be input.

Further, regarding the group division, the optimum division method is automatically selected and displayed by the long-term inspection planning method described with reference to FIG. It is also possible to manually set the frame and draw up a long-term inspection plan by designating the frame with an input device such as a mouse.

The screen on the right side of FIG. 6 shows the number of control rod drive mechanisms belonging to each group obtained by the above-described input operation of information by cycle after inspection. For example,
It is shown that there are four control rod drive mechanisms in the cycle “5” after inspection of group A. That is, this example corresponds to the data that is the information processing target of the long-term inspection plan, and corresponds to (1) in FIG. Based on this data, the long-term inspection plan of the control rod drive mechanism up to the inspection cycle can be automatically prepared by the long-term inspection plan making method described with reference to FIG.

FIG. 7 shows the number of control rod drive mechanisms to be inspected in each cycle up to the inspection cycle destination established by the long-term inspection planning method and the apparatus based on the data of FIG. 6 and the cumulative number thereof. Is.

From the 7th cycle onward, the set inspection will be performed for each group, but during the transition period from 1 cycle to 6th cycle, the number of control rod drive mechanisms inspected will be the total number of control rod drive mechanisms in the plant. The inspection cycle (in this case, 7
The maximum number of control rod drive mechanisms to be inspected is 9, and the number of control rod drive mechanisms to be inspected is more than the average number of vehicles divided by the cycle (about 20 in this case). This is due to the increase in the number of control rod drive mechanisms that are inspected at random positions to the control rod drive mechanisms that are close to each other (grouped position) as shown in the figure. Is.

In the long-term inspection planning method of this embodiment, the grouping setting shown in FIG. 6 is changed sequentially in order to equalize the number of control rod drive mechanisms to be inspected in each cycle. And the information processing is performed for all the setting conditions, and the maximum or average value of the number of vehicles increased from the above-mentioned average number, and both values are used as optimization indices, and the group division method that minimizes these Therefore, it is possible to level out the number of inspections up to the inspection cycle destination and to make and provide a long-term inspection plan for grouping the core arrangement of the inspection control rod drive mechanism. As an example, it can be realized by obtaining the group that minimizes the optimization index x as described above.

The long-term inspection plan according to the present embodiment (the result of the group division for equalizing the number of inspections up to the inspection cycle destination) is the inspection plan of 5 cycles without exceeding the set number of cycles as the purpose of this office. It corresponds to the result of planning a grouped inspection plan from 7 to 7 up to the inspection cycle destination.

Further, as the optimization index, not only the above-mentioned number of control rod drive mechanisms to be inspected but also the cost of inspection work and the work process (time, artificial number, etc.) can be applied.

[0045]

As described in detail in the above embodiments, according to the present invention, in the planning of the inspection plan of the control rod drive mechanism of the nuclear power plant, the core arrangement of the control rod drive mechanism to be inspected is optimized and at the same time. The number of control rod drive mechanisms to be inspected in one regular inspection can be leveled, the inspection cost, process and work amount can be optimized, the reliability of the control rod drive mechanism can be improved and the maintenance work efficiency can be improved. Can be contributed to.

Further, by grouping the control rod drive mechanisms to be inspected on the core arrangement, it is possible to perform parallel work with other inspection and maintenance work such as refueling work performed at the same time in the periodic inspection, It can also contribute to shortening the process of regular inspection.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing the method of the present invention.

FIG. 3 is a view showing an example of a control rod drive mechanism inspection plan of a general plant (position of control rod drive mechanism on core arrangement of BWR and cycle after inspection).

4 (1) to (8) are views for explaining the information processing procedure (algorithm) of the long-term inspection planning method.

5 (1) to (8) are diagrams showing an information processing procedure of a long-term inspection planning method.

FIG. 6 is a diagram for explaining information processing regarding input and setting of data for making a long-term inspection plan in the long-term inspection plan making device.

FIG. 7 is a diagram illustrating information processing regarding output, display, and the like of a result of a long-term inspection plan created by the long-term inspection plan making device.

[Explanation of symbols]

1 Long-term inspection planning device 2 Information input / output device for long-term inspection plan data 3 Information record preservation device 4 Information processing equipment 5 Information display device n Control rod drive mechanism inspection cycle count Group A to G

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-146897 (JP, A) JP-A-2-19790 (JP, A) JP-A-4-364499 (JP, A) JP-A-1- 291115 (JP, A) JP-A-1-244395 (JP, A) JP-A-1-96594 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G21C 7/12 G21C 17 / 00

Claims (2)

(57) [Claims] 1. A plant in which the inspection cycle of each control rod drive mechanism provided in a nuclear reactor is defined as 5 cycles.
Regarding the above, increase the inspection cycle by 2 cycles or more.
A long-term inspection planning method for the control rod drive mechanism
Therefore, the data regarding the core arrangement of the control rod drive mechanism and the number of uninspected operation cycles operated after the previous inspection is obtained, and the control rod is divided by a grouping method in which a plurality of control rod drive mechanisms arranged in proximity are grouped. Check size after changing the drive mechanism
Divided into cycles and multiple groups of the same number, the non-inspection operation rhino
Most control rod drive mechanism with the longest number of wheels
All control rod drive mechanisms of Mu group and the above-mentioned uninspected operation
The smallest control rod drive mechanism with the longest cycle count
The number of unincluded groups and the number of uninspected operation cycles are maximum.
The second smallest control rod drive mechanism is included.
The unchecked operation cycle included in each loop
The control rod drive mechanism with the longest number is
A method for planning a long-term inspection of a control rod drive mechanism, which is characterized in that inspections are simultaneously inspected and the setting is repeated sequentially . 2. Apparatus for carrying out the method according to claim 1.
And an information input / output device for inputting / outputting data on the core arrangement of the control rod drive mechanism, the number of uninspected operation cycles, and other data related to the subsequent inspection plan, and an information record for recording and saving the data. A storage device, an information processing device that performs information processing for planning a long-term inspection plan based on the data, and an information display device that displays information related to the planned long-term inspection plan. A control rod drive mechanism long-term inspection planning device.