JP3490471B2 - Plant monitoring equipment for regular inspections of nuclear power plants - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention is implemented in a nuclear power plant.
The operations performed during periodic inspections
Plant safety and soundness and worker safety.
At the time of the periodic inspection of the nuclear power plant to be monitored
Plant monitoring system). [0002] 2. Description of the Related Art The state of a plant at the time of regular inspection is based on various maintenance and
Varies greatly due to inspection work. For example, the reactor
The water level varies greatly as shown in FIG. Reactor water
The first place to rise is the fuel pool for fuel transfer
This is to connect the pressure vessel with the pressure vessel. Fuel movement
Until completion, the initially raised water level is maintained.
Next, when the pressure vessel is covered, the water level is lowered.
During the high pressure test of the pressure vessel, the reactor water
The water level is raised to fill the pressure vessel. Containment vessel
After the restoration, the water level will be returned to normal. In order to measure the water level at the time of such a regular inspection,
In addition, a dedicated water level gauge is provided for regular
Implemented by charge pool cooling purification system. [0004] Such a complicated process is required because:
Remove the containment vessel and pressure vessel lid and remove the fuel in the pressure vessel.
It is necessary to change. Machine along this main process
Disassembly and regular inspection and replacement / repair of the equipment are carried out.
It is important to keep in mind that ensuring plant safety and soundness
保. [0005] Here, ensuring plant safety relates to fuel.
Things. The fuel at the time of regular inspection is in a subcritical state,
Heat has been generated and must be cooled down.
No. The sub-criticality is maintained by inserting the control rod.
Care must be taken not to break this. [0006] Ensuring soundness depends on the safety as described above.
Although there is no possibility of direct connection to the
The goal is to keep equipment in good condition and prevent equipment degradation. Set
The inspection's own purpose is to make the plant sound through equipment repair and inspection.
The plant as a whole.
Operation and maintenance to maintain integrity are not
Of course. In addition to these, it is important to ensure the safety of workers.
It is an important factor. Electric shock or getting water while working
It is necessary to pay attention not to match the damages such as In summary, at the time of regular inspection, the safety of the plant
Maintain integrity and soundness, ensure worker safety,
It means that work needs to be performed. Considering these various conditions, the disassembly and determination of the equipment
It is necessary to carry out inspections and repairs. Because of this,
Including other repair work scheduled by the engineer
Scheduled inspection work plan by comprehensively judging the functions of the entire plant
Had been drafted. Also, during the actual periodic inspection work,
Near from the actual condition of the measuring instrument or plant
Assess the feasibility of scheduled maintenance work
I was trying. When execution becomes possible, the engineer determines
Issue inspection work procedures and tag tags. Doug tags should be operated
Equipment and its period are clearly specified, and work to be focused on is performed.
In the meantime, this equipment changed to a different state for other work
To prevent it from being done. On the other hand, in the procedure manual, special attention should be paid to the plant.
If there are any parameters, specify them and call attention.
Workers monitor plant parameters according to this procedure.
Perform the work while watching. Trouble occurred during work
In the case of
Was. [0012] As described above, nuclear power generation
The substation is in a state significantly different from that during normal operation during regular inspection
The plant is operating, and the plant
Conditions can also vary greatly. In addition, usually closed
And the instrument that indicates the open / closed state of the valve is not taken.
Valves such as the drain valve are open or the measuring instrument
May not be available due to
According to the runt monitoring method, the status of the entire plant can be grasped.
Needed a lot of work to do. Therefore, an object of the present invention is to provide a regular inspection work plan.
When performing planning and periodic inspection work, the plant safety
Plant information and regular prototyping required to maintain integrity and soundness
Plan of the system to be worked by integrating business information organically
The status of the inspection, and based on this,
Plant monitoring at regular inspections of nuclear power plants to improve soundness
It is to provide a device. [0014] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In addition, plant monitoring at regular inspection of a nuclear power plant according to the present invention
The equipment should be used for the planned or scheduled inspections.
Plant status recording unit that records changes in
Scheduled inspection work execution record to save work plan and results of scheduled inspection work
Recording department,Recorded in the plant status recording unitPlant
A plant function to maintain safety from a fuel perspective, and
In order to realize a plant function, at least the plant
Plant system to realize the criticality prevention function of
The system functions of the plant system and its evaluation logic are maintained.
Existing evaluation database,Evaluation targetWith the regular inspection work of
The plant status recording unit for the plant status change.
From the plant state,From the regular inspection work execution record sectionRegular inspection
The work plan and the results of the periodic inspection work are stored in the evaluation database.
Plant system to realize plant criticality prevention function
System function and evaluation logic of the plant systemTo
An operation evaluation unit for obtaining and evaluating the plant condition;
Man-machine interface that outputs the evaluation results by the
And a face. [0015] According to the present invention, there is provided a predetermined nuclear power generation system according to the present invention.
According to the plant monitoring system at the time of inspection,
Measurement of valve opening / closing status, power supply status, pressure / flow rate, etc.
Information indicating the plant status, such as results, and the
The saved periodic inspection work contents are integrated by the work evaluation department and further
Valve status that cannot be directly grasped from the above plant status information
Grasp the plant status including changes in status and logic
The new plant status is recorded in the plant status recording unit. This
Display to the operator to respond to the plant condition at the time of regular inspection.
Comprehensive information can be given. Further, the safety and soundness of the plant and
In order to realize regular inspection work that secured worker safety,
At the time of planning, the plant is realized by scheduled inspection work
The status is recorded in the plant status recording unit at each time, and based on this,
And evaluate the plant condition based on the evaluation result.
Is recorded in the regular inspection work execution recording section. During the regular inspection
Before carrying out the scheduled periodic inspection work,
Plant safety and soundness based on the status record
Evaluate the status of the related system and operate if the evaluation result is good.
Present procedures and evaluate results at the planning and
Can be displayed. [0017] DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, one example of a regular inspection monitoring system according to the present invention will be described.
An embodiment will be described with reference to FIG. The regular inspection monitoring system of the present invention
At the time of regular inspection work, the stem
Centralized comprehensive information in the plant status recording unit 4
Of the evaluation of the data by the man-machine interface
Show. This information can be obtained from the plant 8 and regular inspection work.
From the regular inspection work already performed recorded in the recording unit 6,
Created by the work evaluation unit 1. In the work evaluation section 1,
Plan after evaluating consistency between plant information and regular inspection work
Record in the plant status recording unit 4 including the unmeasurable status of
Record. In addition, if the valve cannot be checked or
Inconsistency between runt information and regular inspection work
Displays this through man-machine interface 5
And set the correct status based on confirmation from the operator.
You. The work evaluation section 1 stores information on the plant state recording section 4.
Reports on plant health based on the evaluation database 2.
Evaluation from the viewpoint of safety and safety and worker safety
do. The evaluation database 2 will be described in detail later.
You. At the time of scheduled inspection work, the scheduled inspection work file
From the work schedule described in Chapter 3, valve operations, pumps, etc.
Equipment operation, logic jumper / lift operation
Track, check for changes in plant conditions, and
The runt state is recorded in the plant state recording unit 4. This
The runt state is evaluated by the work evaluation unit 1 and the evaluation result is
If it is good, record this in the scheduled inspection work file,
If so, give the reason. At the time of regular inspection work
Is the scheduled work described in the scheduled work file 3.
A similar evaluation was conducted prior to the commencement of work, and
If the result is good, issue an operation manual and tag tag, if not
Gives the reason. Evaluation results are
It can be displayed from the machine interface 5. FIG. 2 shows input / output hardware according to an embodiment of the present invention.
3 shows a hardware configuration. Plant 8 valve status, measurement data
Signal via the input circuit 9 and the signal processing circuit 10
Then, it is taken into the computer 11. Processing in computer 11
The result is displayed from the CRT screen 11a, and the tag
The order is output from the printer 12. From the operator
Is executed from the CRT screen 11a. The contents of the evaluation database 2 will be described below.
It will be described in detail. Fig. 3 shows the plant functions evaluated at the time of regular inspection.
Is shown. The plant functions to be realized at the time of regular inspection are
Plant maintenance function, regular inspection work execution function, common function
Can be The plant maintenance function will ensure the safety of the plant during the periodic inspection period.
It summarizes the functions to be fulfilled from the viewpoint of securing all.
In addition, regular inspection work execution functions include disassembly, regular inspection and refueling of equipment.
Indicates the functions required to carry out the original work
However, common functions are necessary to realize these two functions.
This is a key service-like function. In particular, plant maintenance
Function is an important issue related to monitoring during the periodic inspection.
Here, the functions are expanded hierarchically and summarized. In order to realize these plant functions,
Each plant system that needs to function as a system
It depends on the plant operating conditions. Here at regular inspection
All necessary to realize the plant functions required for
Evaluate plant system functions (hereinafter referred to as system functions)
The evaluation method is examined with the goal of Notable plant systems are directly related to fuel.
It is classified into a system that is not related to the system concerned. in this way
The reason for classification is that the plant system involving fuel is a nuclear power plant.
Although there are inherent problems, other plant systems
It consists of a pump, tank, heat exchanger, etc.
Station, valve, power and interlock status
It is to be valued. The plant system directly related to fuel is shown in FIG.
Related to the realization of the criticality prevention function. As a criticality prevention function
Is equipped with a scrum function to prevent
The control rods for adjusting the knit control rod drive water directly to RPV
Return return operation is required. Also, control rod drive
At the time of the regular inspection, remove the control rod coupling and remove the control rod.
It is necessary to remove it outside the furnace.
All fuel assemblies must be removed. Further
Monitor SRM counts to confirm sub-criticality
Need to do this, but this requires a fuel assembly around the SRM
Must be present. In addition, the control rod
Check that interlocks such as crumbs are sound
There is a need. The following information directly relates to the fuel described above.
Things are needed. (1) Control rod related information (Evaluate each control rod
Should be) 1.1 Control rod position 1.2 Scrum ability 1.3 Presence or absence of regular inspection of control rod drive 1.4 Presence or absence of regular inspection of the water pressure control device 1.5 No return operation 1.6 Open / close state of control rod driven water isolation valve (2) SRM related information 2.1 Evaluation of fuel around SRM 2.2 Function evaluation of measurement system (power supply, cable, etc.)
state) (3) Control rod related interlock evaluation (4) Refueling machine operation information 4.1 Evaluation of consistency between fuel allocation and control rod related work 4.2 Evaluation of consistency between fuel allocation and core-related regular inspection work Among the above, the scrum command is issued to the control rod for the scrum capability.
If you are asked to do so, indicate whether you can actually scrum
So the accumulator function is sound and control rod driven water isolation
The condition is that the valve is open. (1) Control rod related information
The report aggregates each data on the control rod map as shown in Fig. 4.
Display for easy understanding of the status of each control rod.
Become. In the condition of 1.1 to 1.6,
The title is displayed in red. The evaluation of the fuel around the SRM in (2)
From the number of fuels around the SRM
Evaluate whether there is. The evaluation of the function of the measurement system
Assuming that the correct count rate was measured, this information
Make sure that the interlock is correctly reflected
And specifically, the state of the power supply, cable, etc.
Will be evaluated. Here, a method of evaluating the power supply state will be described with reference to FIG.
Will be described. The power supply of the SRM is as shown in part (b) of FIG.
To the terminal block (C,
D), and through fuse E to terminal block (F, G).
SRM power is obtained from this. Whether this power source is secured or not depends on the distribution
There is a voltage on panel A and there is no break between SRM power supply
It depends on whether it is connected or not. To determine this,
The connection state is converted in advance to the logic shown in FIG.
To evaluate. That is, the plant status recording unit 4 shown in FIG.
Are the circuit breaker B and the terminals C and D shown in FIG.
The states of F, G and fuse E are recorded. Scheduled for scheduled inspection
If the lifting work of terminal C is mentioned as the work,
In the business evaluation section 1, the state of the breaker B is set to false.
Set in the plant status recording unit 4 and
Re-evaluate [SRM power] and convert it to false
You. If there is logic using [SRM power]
This logic will also be re-evaluated. That is, [SRM power]
It is a state that is always evaluated in response to the operation. Also,
If there is work to remove fuse E, [SRM
Source] is false, in which case terminals D and E are
If jumped, the element between the jumped terminals is f
[SRM power supply] is tr
ue. In the control rod related interlock, the equipment regular inspection
For jumper lift work, etc.
Some interlocks such as blockage of control system and control rod withdrawal
Could be done. The extent of such loss of function
Evaluate what will be achieved. This result was
It is displayed in the same manner as in the interlock evaluation (FIG. 7). In the refueling machine operation information, the operation of the refueling machine is described.
Fuel arrangement in the reactor core according to the transfer plan or operation results
Understand the condition. Work closely related to the fuel arrangement
In-furnace related work such as control rod regular inspection, furnace measurement system regular inspection and replacement
For business, fuel rods around these objects
It must be taken out in a predetermined pattern.
In addition, in the regular inspection of the control rod drive mechanism,
Must be pulled out, but before this, the four
The charge aggregate must be pulled out. These, work
And the fuel assemblies are checked for positional consistency. For systems that are not directly related to fuel,
Like grids and power supplies directly related to maintaining runt safety
Strains related to the maintenance of these strains, and even more
Are roughly divided into non-systems. First, to maintain plant safety
Describe the monitoring of systems that may be directly involved.
There are many strains belonging to this group, but here is an example
The fuel pool cooling purification system (FPC) will be explained as
You. The work at the time of regular inspection is related to FPC.
When there was, by this work, the plan shown in FIG.
Evaluate whether any of these functions are blocked
There is a need. Hereinafter, this method will be described in detail. FIG. 6 shows the P & ID of the FPC. F
The main system function of PC cools and purifies fuel pool water
However, at the time of regular inspection, water is
It has a system function to set up. System equipment required for these periodic inspections
Table 1 summarizes the operation modes for realizing the functions. [0035] [Table 1]Mode 1 is the normal mode, Mode 2 is the fuel pool
When the cooling of the car cannot be made in time,
It is. Mode 3 is excess reactor well and fuel pool
Mode 4 is to reverse the water.
It is. These operating modes can overlap.
You. These evaluation methods are important, but will be discussed later.
Will be described in detail. The logic is shown at the end of this table.
Will be described later. Table 1 shows functions realized by the plant system.
However, Table 2 can occur when the system is operated incorrectly
Indicates a possible malfunction event. [0037] [Table 2] These primary system functions and fault events are based on the status of the operated valve.
Are realized by the state of the
The condition needs to be evaluated. For this purpose,
Logic of paths to internal equipment, external equipment and equipment
It is necessary to define logic data for table
Reference numeral 3 indicates necessary equipment. [0038] [Table 3] In Table 3, A in the first row is the equipment in the system,
Represents a pump. This system includes a, b,
Although there is a system, A is representative of two pumps.
As shown in the detailed contents of the last column, the pump of system a is A1
And the b-type pump is represented by A2. In this way, the equipment
It can be represented separately or on behalf of. This
Table 4 shows the routes using these. [0039] [Table 4] In Table 4, XA is from the skimmer surge tank to the pump
It shows the route to get to. In this route XA, the tank (X
1, X2) and two pumps (A1, A2),
Since there is a route connecting each of them, it is shown in the right column of Table 4.
It will be like that. Here, X1A1 is a boolean value,
This path connects the skimmer surge tank X1 and the pump a.
True if all intermediate valves are open and connected
Become. That is, XA is X1A1, X1A2, X2A1,
True if any path of X2A2 is true. In "Route type" in Table 4, the internal route
Indicates that the start and end points of the piping route are
The external inflow route indicates that water flows in from the external system.
The outflow route indicates that water flows out to the outside.
Is shown. The external inflow route is the mode 4 in Table 1 and the
It is related to condition numbers 4 and 5. The external outflow route is the mode shown in Table 1.
3 relates to defect numbers 1 to 3 in Table 2. Especially important ones of "Route type" in Table 4
Is a detour. In the case of FPC, the heat exchanger (B1, B
There is a route that bypasses 2), and this detour is alive
If so, the cooling capacity is greatly reduced. In the last part of Table 4
The corresponding detour is shown. The "logic" in the right column of Table 1 indicates each mode.
The conditions for the condition to be established are expressed using the route in Table 4.
Things. If the logic is true, the mode is established
In this case, the corresponding function is evaluated. The method for evaluating the system function will be described below.
You. The cooling function of the FPC depends on the capacity B of the heat exchanger and
Estimated by summing product of flow rate A for heat exchanger
I do. The flow rate through the heat exchanger B is "flow resistance x pump"
Where the flow resistance is the smallest flow path in the path
It shall be proportional to the area. The pump capacity is pump
Is evaluated based on the operating condition of
You. If there is a bypass path, set the pump capacity to zero.
You. The capacity of heat exchanger B is proportional to the flow rate flowing through the secondary side
Shall be. The purifying function of the FPC is the same as that of the filtration desalinator C.
Capacity x flow rate "is evaluated by adding it to the filter desalinator.
I do. However, when there is a bypass route in the filter desalination
Is the minimum area of the path through the filter
It is assumed that flow distribution is performed with the ratio of the minimum area. The drainage capacity and the water supply capacity are each evaluated by the flow rate.
Shall be. The possibility of failure is evaluated by the related logic shown in Table 2.
Be valued. However, these are just possible malfunctions
And, of course, there are normal operations. For example, MX
This is water injection from the water supply system, which is mode 3 in Table 1.
However, at the same time, there is a possibility that excess water will be supplied to the fuel pool,
It is described in bug number 4. As described above, the method of evaluating the system function for the FPC
The method for evaluating the possibility of failure was described.
It is generalized. The RHR has a number of interlocks.
Yes, jumpers performed in connection with equipment inspection
-May be affected by lift work. This
In order to display such effects,
The viewing device displays the logic diagram shown in FIG. This log
The feature of the block diagram is that the logic circuit power supply
Information and information on the terminals to be lifted or jumpered.
It is the point shown. In this logic diagram, and logic
If the terminal inside is lifted, this logic is False
It becomes se. Also, if the two terminals are jumpered
Even if the contact during this time is OFF, Tru
e. For example, in the lower right and logic of FIG.
The (7,8) contact of S-629A-2 turns off the other
It is assumed that all the sources and terminals are true. At this time,
And logic becomes False, but FS-629A
Terminal p (H11-P68) surrounding the (7,8) contact of
2) and terminal 2 (H11-P682) are jumpered
If so, this and logic becomes true. [0050] As described above, the target
Regarding the system function evaluation of the runt system,
Functions, possible functions, equipment functions, bypass loops
It is necessary to evaluate the presence or absence of
You. Table 5 summarizes the system monitoring items to be evaluated.
Was. [0051] [Table 5]In the plant monitoring device of the present invention, each plant system
Count the system monitoring items determined by the configuration,
Monitor items that actually occur and change from the plant status are colored
By changing, the state of the plant can be easily grasped. Was
For example, in FIG. 6, the valve on the left side of the heat exchanger B2 is open.
Then, in Table 5, the bypass route of heat exchanger bypass route
Is red because the heat exchanger does not work
The purifying ability of the function becomes red. The operation mode at this time is
If the charge pool purification / cooling mode, the corresponding item is blue etc.
Color. Finally, the water purification function of the FPC
In case of loss, the plant health maintenance function and water quality
Function becomes red. In the above, the plant functions required for regular inspection have been implemented.
Monitoring contents of the plant system that are directly required for realization
To achieve the necessary plant functions during regular inspections
There are many unrelated strains. These strains
In the related work, in particular, among the monitoring items shown in Table 5,
To detect the possibility of the condition in advance and evaluate it
And For example, regular inspection of recirculation pump is safe at regular inspection
Although there is no direct effect on securing
Reactor water may be lost. Possibility of such malfunction
Is selected in advance for each system and the same evaluation is performed. Further, the operation of the above-described device of the present invention is carried out.
In order to realize this, in particular, a terminal
Information, including the drain valve
Information must be described. The components of FIG. 1 and their functions have been described in detail.
As described above, the input of the plant monitoring apparatus according to the embodiment of the present invention is
FIG. 8 shows information to be output and information to be output. Input information is
Plant information from the runt 8 measuring instrument and the operator
Due to plant status and scheduled inspection work, and output information
Operation reports, tag tags and plant status monitoring
Information. In the following, the plant monitoring device of this embodiment is
The flow of the process by
This will be described separately with reference to FIG. At the time of planning the regular inspection work, the contents of the regular inspection work
And enter the time. The contents of the regular inspection work include valve operation and logistics.
(Step A1). Apparatus of this embodiment
Classifies this work content into systems (step A2),
For each strain, determine whether or not the functions shown in 3 may be inhibited
(Steps A3 and A4). In this evaluation
Thus, the evaluation database 2 is used. Obstruct
If there is no (YES), the work content and time
It is registered in the inspection schedule work file 3 (A5). Inhibit
In the case of (NO), in FIG.
Event function turns red. For further information,
5 (a), FIG. 7 or Tables 1, 2, 5, and 6 are displayed.
(Step B6). In step B6, the control rod related information
If relevant, position each control rod as shown in FIG.
In addition, the control rod position, scrum capacity, control rod drive
Presence / absence, regular inspection of the water pressure control device, no return operation
Is displayed, and the open / closed state of the control rod drive water isolation valve is displayed.
The part that causes contact inhibition is displayed in red. In addition, inhibition
By requesting, even if you do not
It is configured so that similar information can be confirmed. However, this
If red is not used,
Is displayed with the color changed to blue. Note that plant functions are
If it is harmed, this regular inspection cannot be carried out.
This will change the work plan. At the time of carrying out the periodic inspection work, the scheduled inspection work file
The scheduled time has passed during the regular inspection work written on the
If there is something (YES in step B1),
Evaluate the preconditions (step B2) and satisfy
Work (if YES), classify the work into
Step B3), the function evaluation of FIG. 3 is performed (Step B)
4, B5), when the plant function is not hindered (YES
), A work procedure manual is issued (step C4). In step B5, the plant function is interrupted.
In case of harm (in the case of NO), respond to the inhibition factor in FIG.
The function of the plant that changes is displayed in red (step
B6). In this case, the method of obtaining detailed information was described earlier.
This is the same as when planning. Operations to be confirmed during the execution of the periodic inspection work
If there is, present a confirmation request (step C2) and confirm
Update the plant status recording unit 4 by the operation (step
D2). Also, monitor changes in plant status (step
D1), if there is a change, the plant status recording unit 4
Update (step D2), this change is
Evaluate the effect on functions (Steps B3, B4, B
5). [0061] As described above, according to the present invention,
The plant monitoring device at the regular inspection of the child power plant
Record section, regular inspection work execution record section, evaluation database and work
It has a business evaluation department and a man-machine interface
In the work evaluation department, the plant status recording department and regular inspection work
The information of the implementation record department was integrated, and in addition to this information
Plan including information that cannot be directly grasped by measuring instruments, etc.
Since it is recorded in the status recording section, various
At the time of individual operation such as work, valve operation, jumper / lift work, etc.
Comprehensively understand the plant status of
The impact of crops on the power system to ensure plant safety functions?
From the system directly related to fuel and the system related to fuel.
Can be evaluated jointly. In particular, systems directly related to fuel
By presenting information centering on the control rods of the heart,
Runt operation monitoring can be performed effectively.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration of a regular monitoring plant monitoring device of a nuclear power plant according to one embodiment of the present invention. FIG. 2 is a diagram showing an input / output hardware configuration of a plant monitoring device at regular inspection of a nuclear power plant according to one embodiment of the present invention. FIG. 3 is a diagram showing a plant function of a nuclear power plant. FIG. 4 is a diagram showing a display example of control rod related data. FIG. 5 is a diagram illustrating an example of logic for evaluating an SRM power supply. FIG. 6 is a system diagram showing a system of a fuel pool cooling and purification system. FIG. 7 is a Tre for evaluation of a system interlock logic.
The figure which showed e. FIG. 8 is a diagram showing input / output information of the plant monitoring device for predetermined inspection of nuclear power generation according to the present invention. FIG. 9 is a flowchart showing the flow of processing by the plant monitoring apparatus for predetermined inspection of nuclear power generation according to the present invention. FIG. 10 is a diagram showing changes in the reactor water level at the time of regular inspection. [Description of Signs] 1 Work evaluation section 2 Evaluation database 3 Scheduled inspection work file 4 Plant status recording section 5 Man-machine interface 6 Regular inspection work execution recording section 7 Work procedure printing section 8 Plant

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G21C 17/00 G21D 3/00-3/04

Claims (1)

(57) [Claims] [Claim 1] A plant state recording unit for recording a change in plant state due to a regular inspection work being carried out or being planned, and a result of the regular inspection work plan and the regular inspection work being executed A regular inspection work recording unit to be stored, a plant function to maintain the safety of the plant recorded from the plant state recording unit from the viewpoint of fuel, and at least a criticality prevention function of the plant to realize the plant function. An evaluation database that stores the system functions of the plant system, the system functions of the plant system and its evaluation logic, and a plant state change accompanying a regular inspection work to be evaluated .
The plant state from the plant state recording unit, the regular inspection work plan and the regular inspection work execution results from the regular inspection work execution recording unit
From the evaluation database,
System to realize the function and the system of the plant system
A work evaluation unit that obtains a function and an evaluation logic to evaluate the plant state, and a man-machine interface that outputs an evaluation result by the work evaluation unit; Monitoring device.