JPH0434120B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an abnormal operation guide device for a plant, and in particular, the present invention relates to an abnormal operation guide device for a nuclear power plant, and in particular, it aims at this while ensuring safety when an abnormal situation occurs in a nuclear power plant. The present invention relates to an abnormality operation guidance device for a plant that provides an operating method for leading to a certain state to an operator.

[Prior Art] A conventional abnormal operation guide device for, for example, a boiling water nuclear power plant (hereinafter referred to as a BWR plant) inputs the contents of an emergency operating procedure manual into a computer. It is stored in memory, and when an abnormality occurs, the operating procedure corresponding to the abnormality is read out from the computer (storage device) and guided to the operator.

[Problems to be Solved by the Invention] Conventional emergency operating procedure manuals are originally designed to provide information on the development of one typical abnormality for each typical initiating event in order to serve as a reference for selecting an operating method when an abnormal situation occurs. Driving methods for certain situations are provided as examples for reference. Therefore, conventional devices that store an emergency operating procedure manual in a computer and guide operating methods in an abnormal situation based on the contents have the following problems.

The first problem is that the conventional emergency operating procedure manual
This is because operating methods are prepared for the events that cause the abnormality. In general, the number of events that cause an abnormality is extremely large when considered to that extent.
In conventional devices, in order to respond to various abnormal situations, it is necessary to prepare operating methods for each of these many triggering events. Therefore, the number of operating methods that must be prepared becomes enormous, and the amount of work required and the capacity of the computer's storage device become enormous.

Furthermore, in conventional devices, in order to issue a guide when an abnormal situation occurs, it is necessary to determine which initiating event the abnormality is caused by. Regarding the classification of abnormalities for this purpose, since there are a large number of initiating events as described above, the required amount of work and the capacity of the computer's storage device become enormous.

The second problem is that the emergency operating procedure manual provides operating methods for the development of a single abnormality. In other words, with conventional equipment in which the contents of the emergency operating procedure manual are stored in a computer, if the abnormality develops in a direction different from the prepared progress situation due to a system or equipment failure after an abnormality occurs, Guidance on driving laws will be impossible.

On the other hand, if operating methods are to be prepared in accordance with the development of various abnormalities assuming failures in the system or equipment, the capacity of the computer storage device required will be enormous.

The purpose of the present invention is to eliminate the problems of the prior art described above, and to reduce the storage capacity of an electronic computer.
In addition, to provide an efficient plant abnormality operation guide device that can issue appropriate operation guidance regardless of the cause of the abnormality and regardless of the progress of the abnormality. There is a particular thing.

[Means for Solving the Problems] The above purpose is to provide an abnormality operation guide device that guides operators to perform emergency operations to bring the plant state to the target state when an abnormality occurs, and to provide system/equipment information that affects the plant operation method. A data file containing system candidates to be used in emergency operation for each combination of usable or unusable systems/equipment states selected in advance, and various data files related to plant operating status when performing emergency operation. determining means for determining from the signal which system/device is unusable among the plurality of systems/devices selected, and determining which of the combinations it is in;
This is achieved by providing means for knowing from the data file the lineage candidates prepared corresponding to the combinations discriminated by the discriminating means and for guiding the lineage candidates.

Preferably, a plurality of ordered line candidates are prepared for each combination, and when the expected result is not obtained by operating the first candidate line, the second candidate line is used as the guide. The configuration is as follows.

[Operation] In the present invention, when an abnormality occurs, the operating method at the time of the abnormality is guided not by the initiating event but by the systems and equipment that can be used at that time. However, the systems that make up the plant
Since there are a large number of devices, it would be time-consuming to determine whether each system/device is in a usable state one by one. Therefore, in the present invention, emergency operation methods are prepared for combinations of the states of multiple systems and equipment selected in advance among the systems and equipment that affect the plant operation method, and when an abnormality occurs, the above selection method is prepared. The emergency operation method prepared for that combination, that is, the system candidate that should be used (this system candidate is other than the system/device selected above) ). This allows for quick guidance.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

The abnormal operation guidance device for the BWR plant 1 shown in FIG. It is composed of a device 6, an operating procedure data file 7, a display device 8, a response determination device 9, and a response determination data file 10.

The abnormal operation guide device of this embodiment is activated by a reactor scram signal indicating nuclear reactor shutdown. In other words, after an abnormal situation occurs, from the moment a reactor scram occurs either automatically by a plant interlock or manually by an operator, this system selects the operating method necessary for cold shutdown, and the system selects the operating method necessary for cold shutdown. begins to appear.

When the abnormal operation guide device of this embodiment is activated by the reactor scram signal, the event group discriminator 2 first determines whether each of the events that affect the operation method has occurred or not. Judgments are made using process signals such as the reactor water level, or signals related to system/equipment status such as valve opening/closing status, and furthermore, depending on whether each event has occurred, it is determined to which event group the abnormality that occurred belongs. It is determined.

Events that influence driving methods were selected as follows: Events that affect operating methods include those that affect whether or not the system can be used, and those that affect the required capacity of the system. As the former event, we selected loss of water supply system function, main steam isolation valve closure, and loss of external power supply, and as the latter event, we selected safety relief valve stuck open and pipe rupture. Event groups are classified based on the occurrence or non-occurrence of each steam event, that is, the combination of occurrences of each event.If no pipe rupture occurs, there are 12 events as shown in Figure 2. become a group. In cases where pipe rupture has occurred, the event of pipe rupture is subdivided by the rupture area and location, and for each subdivided event, it is determined whether other events such as loss of water supply system function have occurred. Divide into groups by considering these combinations. Here, we consider the capacity of the water injection system necessary to secure the water level and the necessity or unnecessaryness of depressurization as factors that affect the operation method, and use these two items as indicators to determine whether a pipe rupture occurs in the gas phase or in liquid. This is done by determining the fracture area that serves as the dividing line for each phase fracture.

The cold shutdown countermeasure start/end condition determining device 3 includes:
It measures the start and end conditions for each guide regarding cold shutdown countermeasures. FIG. 3 shows the conditions used in this abnormal operation guide device. As shown in FIG. 3, the condition for starting the guide to secure the water level is achieved by the scram signal, that is, at the same time as the abnormal operation guide device according to the present embodiment is activated.
Additionally, when the operator determines that a cold shutdown has occurred,
The guide to securing water levels ends. The starting condition for depressurization is that the reactor water level is scram level L3.
The termination condition is that the residual heat removal operation has started. Regarding residual heat removal, the reactor pressure was reduced to 1.03MPa by depressurization operation.
The process starts when the temperature drops below the specified temperature and ends when the operator determines that cold shutdown has occurred. Furthermore, cooling of the containment vessel is started when the pressure and temperature of the containment vessel exceed a predetermined set value, and ends when the pressure and temperature of the containment vessel become lower than the set value.

As described above, the cold shutdown countermeasure start/end condition determining device 3 takes in signals related to the process amount etc. from the BWR plant or input signals from the operator, and determines the start/end of guidance for each cold shutdown countermeasure. do. In this way, by determining the start and end of each measure, it becomes possible to provide operational guidance at an appropriate timing. When the abnormal operation guide device determines to start guidance for a certain cold shutdown countermeasure, the system to be used selection device 4 selects the system to be used for the cold shutdown countermeasure.

In the system usage order data file 5, the order of the systems to be used for each cold shutdown countermeasure is prepared in correspondence with each event group. An example of this order of use is shown in FIG. In Fig. 4, the mark *) indicates one operation mode of the residual heat removal system. Fig. 4 represents the group number among the event groups shown in Fig. 2.
This corresponds to 5. Here, the order of use is
This was determined in advance through phenomenon analysis, etc. In Group No. 5, the water supply system and main steam system are unusable, so the isolation cooling and control rod drive hydraulic system are registered as the first operating method to secure the water level, and the The high pressure core spray system is registered as the second priority. In addition, the steam condensing system is registered as the first priority in the operating method for taking pressure reduction measures, and the relief safety valve is registered as the second priority.

The usage system selection device 4 selects the systems to be used from among the systems prepared in the system usage ranking data file 5 in order of priority. For example, the event group No. shown in Figure 4.
First, the isolation cooling system and the control rod drive hydraulic system are selected as systems for securing the water level corresponding to No. 5.

The operating procedure creation device 6 creates an operating procedure for the system selected by the system selection device 4 to be used. In the operating procedure data file 7,
For each system, the operations and checks necessary to operate it are prepared with conditions related to the process amount or system/equipment status. In Figure 5,
An example of a cooling system during shutdown is shown. In figure 5
RHR*) indicates a residual heat removal system. The operating procedure creation device 6 receives signals regarding process quantities and system/equipment status from the BWR plant, and when the conditions set for the operations and confirmations described above are met, displays them using the operations and confirmations as a guide. Output to device 8.

The response determination device 9 uses the response determination data file 10 to check the plant response after guidance, and determines whether it is as expected. The method used for response determination in this abnormal driving guide device differs depending on the type of operation. In other words, for systems used to directly implement cold shutdown measures,
Check system operation and effectiveness. on the other hand,
For other preparatory operations or operations of auxiliary systems, only check the operation of the system.

To check the operation of the system, two methods are used: one is to check the component level, such as piping line-up and pump rotation speed, and the other is to check the system characteristics based on process quantities. An example of the latter is a method that uses a pump flow rate-pump head curve to confirm the normal operation of the system for securing the water level from the reactor pressure and pump flow rate.

The effectiveness can be confirmed by selecting the process amount shown in Figure 6 for each cold shutdown measure and determining whether the value of the process amount at the set time after the operation is greater than (or less than) the set value; After the operation, it is determined whether or not the value of the process amount is maintained above (or below) the set value.

If the response determination device 9 determines that the response of the plant is as expected, guidance for that system is continued. On the other hand, if it is determined that the plant response is not as expected, the guide for that system is discontinued, and the system to be used selection device 4 prepares the system in the system usage order data file 5 as the next usage order. Select the system you are in and start being guided through the operating procedures for that system.

Incidentally, the event group is periodically determined, and when the event group changes, the system to be used is selected from the system usage ranking data for that event group.

Next, the operation of the abnormal operation guide device of this embodiment will be explained using an example of an abnormality in which the initiating event is loss of water supply (note that in the present invention, it is not necessary to specify what the initiating event of the abnormality is, The reason why the initiating event of the abnormality is assumed to be the loss of water supply is to facilitate understanding of the following explanation.) FIG. 7 shows the temporal changes in reactor pressure and reactor water level after the loss of feedwater occurs, using solid lines and broken lines, respectively.

As water levels drop due to loss of water supply, plant
The reactor scrams due to the interlock (A).
The abnormal operation guide device of this embodiment is activated by this scram signal, and first the event group discriminator 2
At this point, determination of which group the generated abnormality belongs to begins (B). As a result, the water supply system function was lost and the main steam isolation valve was closed, and it was determined that this was an abnormality belonging to Group No. 5.

Since the guide start condition (scram signal) for securing the water level is satisfied, when the event group discrimination is completed, the usage system selection device 4 selects
The isolation cooling system and control rod drive hydraulic system are selected as systems for securing the water level. These systems are listed in the system usage ranking data file 5.
This is prepared as the first order of use for group No. 5 to secure the water level.

When the systems are selected, the operating procedure creation device 6 extracts the procedures for operating these systems from the operating procedure data file 7 and shows them on the display device 8.

As a system for securing the water level, the high-pressure core spray system will automatically start up as the water level drops. Since this system has not been selected as a system for securing the water level, the abnormal operation guidance device guides the high-pressure core spray system to be manually stopped.

When the reactor water level recovers and exceeds the scram level L3 (C), guidance for depressurization begins, the steam condensation system is selected, and guidance for operating procedures is provided. Following this guide, the high-pressure core spray system is shut down, and the operators begin warming and flushing to prepare the system for use (D). In this example, assume that the steam condenser system warming and flushing operations have failed. The response determination device 9 detects that the response to the warming and flushing operations is not as expected, determines that this operation has failed (E), and is prepared as the second system for use as a depressurization system. Select the safety relief valve (F) that is installed and show its operating procedure guide.

When the reactor pressure falls below 1.03 MPa (G) by depressurization using the safety relief valve, guide residual heat removal begins. Following this guide, the operator begins flushing, which is an operation to prepare the shutdown cooling system for use.

FIG. 8 is a configuration diagram of an abnormal operation guide device according to another embodiment of the present invention. The abnormal operation guide device according to this embodiment includes an alarm device 11 in addition to the abnormal operation guide device according to the first embodiment shown in FIG.
and an input device 12 are added.

The alarm device 11 issues a warning to the operator if the operator does not follow the guide. The input device 12 is used by an operator to input commands to the abnormal operation guide device.

If the operator does not follow the guidance output by the abnormal operation guide device, the response of the plant will differ from what the abnormal operation guide device predicted. If the response determination device 9 determines that the response of the plant is not as expected, there is a possibility that the operator is not following the guide. Therefore, the alarm device 11 outputs a warning to the operator. From this alarm, the operator knows that the plant's response is not as expected, and reconfirms his/her own operations.

As a result of the confirmation, if the operator finds that the guidance issued by the abnormal operation guide device and the operation performed by the operator are the same, the operator inputs this fact from the input device 12. As a result, similarly to the first embodiment, the response determination device 9 determines that the response of the first-ranked usage system is not as expected, selects the second-ranked usage system, and outputs the guide.

On the other hand, if the confirmation results show that the guidance issued by the abnormal operation guide device and the operation performed by the operator are different, if the operator made a mistake in the operation, the abnormal operation guide device should be corrected. Redo the operation to follow the output guide. On the other hand, if the operator intentionally performs a different operation (in other words, if the operator, based on his/her judgment, operates a system that is different from the guidance of the abnormal operation guide device), the operator will be able to report the abnormality. input into the driving guide device. When this input is received, the abnormal operation guide device displays all the system usage candidates prepared in the system usage ranking data file 5 on the display device 8. If the system the operator is using is among the displayed systems, the operator inputs which of the displayed systems the system he is using corresponds to. Based on this input, the abnormal operation guide device learns the system that the operator is using, performs guidance for that system, determines responses, etc., and supports the operator.

[Effects of the Invention] As explained above, the present invention has the effect of being able to quickly guide appropriate operation methods using only usable systems and equipment, regardless of the cause of the abnormality. There is. Another advantage is that the storage capacity of the storage device can be small.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an abnormal driving guide device according to the first embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example of event groups based on combinations of occurrences and non-occurrences of events that affect driving methods. Fig. 3 is an explanatory diagram showing the start and end conditions of the guide for each cold shutdown countermeasure, Fig. 4 is an explanatory diagram showing an example of grid usage order data, and Fig. 5 is an explanatory diagram showing an example of operation procedure data. , Fig. 6 is an explanatory diagram of the process quantities used to judge the plant response after guidance, Fig. 7 is an explanatory diagram showing the phenomenon after an abnormality occurs and the operation of the abnormal operation guide device, and Fig. 8 is an explanatory diagram of the process quantities used to judge the plant response after guidance. FIG. 2 is a configuration diagram of an abnormal operation guide device according to a second embodiment of the invention. 1...BWR plant, 2...Event group discrimination device, 3...Cold shutdown countermeasure start/end condition determination device, 4...Using system selection device, 5...System usage order data file, 6...Operating procedure Creation device, 7...Operating procedure data file, 8...Display device, 9...Response judgment device, 10...Response judgment data file, 11...Alarm device, 12...
...Input device.

Claims (1)

[Scope of Claims] 1. In an abnormality operation guide device that guides an operator to perform an emergency operation to bring the plant state to a target state when an abnormality occurs, a plurality of pre-selected systems and devices that affect the plant operation method are provided. A data file in which system candidates to be used in emergency operation are prepared for each combination of system/equipment usability states, and a data file that prepares system candidates to be used in emergency operation for each combination of system/equipment usability states, and when performing emergency operation, the system/equipment candidates selected from various signals related to the plant operating status are Find out which systems and equipment are unusable,
A discriminating means for discriminating which of the combinations is in a combination state, and a means for knowing from the data file a lineage candidate prepared corresponding to the combination discriminated by the discriminating means and guiding the lineage candidate. What is claimed is: 1. An abnormality operation guide device for a plant. 2. The abnormal operation guide device for a plant according to claim 1, wherein the means for guiding the system candidate guides the operating procedure of the system candidate. 3. A plurality of lineage candidates ordered as lineage candidates are prepared in the data file, and the guiding means guides the second candidate lineage when the first candidate lineage is manipulated and an expected response is not obtained. An abnormality operation guide device for a plant according to claim 1, characterized in that: 4. The determining means periodically monitors various signals related to the operating status of the plant and periodically determines which of the combinations has occurred, and the guiding means determines whether the combination determined by the determining means has changed. 2. The abnormal operation guide device for a plant according to claim 1, wherein the system guides system candidates prepared in accordance with the combination after the change. 5 Multiple systems/systems in the data file
2. The abnormal operation guide device for a plant according to claim 1, wherein the combination of usable/unavailable states of the equipment is a combination that also takes into consideration states that affect the capacity of the system.