JPH0776884B2 - Automatic operation management method for process plant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an automatic operation management method for a process plant.

(Prior Art) Automated operation of process plants is advanced at the level of equipment that constitutes the plant, and some equipment can be operated sequentially without human intervention to start the equipment. It already exists. However, in such a fully automatic process plant, there is no problem if the plant operates as expected in advance,
If some equipment does not perform as planned, or if it fails, automatic operation of the plant becomes impossible,
There is a risk of the plant going out of control.

If the equipment is started up sequentially in this way, it often happens that the equipment is started independently of the plant status, which may cause inconvenience.Therefore, it is possible to introduce a rule-based system that considers the plant status as the equipment start-up condition. Even in this system, unless the operating conditions to which this rule is applied are limited, the operation when used in a plant condition that is not taken into consideration at the time of design cannot be guaranteed, and therefore it is not an essential problem solving.

(Problems to be Solved by the Invention) Originally, the starting sequence of the equipment that constitutes a process plant is essentially what the function of the equipment means to the entire process plant and what it is for. It is decided after understanding various problems. However, since the sequence control is merely one in which the resulting starting sequence is taken out, it can be applied to standard operation, but if some trouble occurs, the above-mentioned problems occur.

The present invention has been made in consideration of such a point, and in the case where a human controls the start-up of equipment, when the plant largely deviates from the planned state, the principle principle based on which the start-up order of the equipment is determined. Proper operation of the plant in any state by determining the operation procedure according to the principles and principles that should be taken into consideration when operating the process plant even in automatic control, such as returning to redetermining the operation sequence. The purpose is to provide an automatic operation management method that can

[Structure of the Invention] (Means for Solving the Problems) The automatic operation management method of the present invention provides a main state quantity that represents the operating state of the process plant with respect to the final goal of the process plant and safety of the process plant. The three-way relationship between the safety evaluation, which is always evaluated as the operating condition to be satisfied, and the function that is expressed by the operation of the equipment, which is necessary or dependent on each of the main state quantities and the safety evaluation, is pre-established. In addition to clarifying, the driving policy that defines the state variables to be changed from the mutual relation of the main state variables is defined in advance, the procedure of the driving operation to the final goal is secured, and the function to satisfy the safety evaluation is secured. Set an operation target for each state quantity based on the relationship of the three parties so as to change the predetermined state quantity according to the operation policy selected according to the operating state of the plant Characterized in that it derived in that form.

(Operation) In the automatic operation management method for a process plant of the present invention, first, an operation target is set by performing safety evaluation so that a predetermined function is exhibited, and a device for ensuring safety according to this operation target. Is automatically started. Then,
When the function to secure the state quantity is not sufficient for the state quantity, the operation limit target that limits the corresponding state quantity is set, and the operation target is set so that the predetermined function is exerted, and it is necessary. Devices are automatically started.

When the function that satisfies the safety evaluation and the function that holds the state quantity are confirmed, the state quantity to be changed is selected according to the goal of starting or stopping the process plant, and the state quantity increases or decreases for each state quantity. The operation target is set based on the data created in the form of a set of operating targets whose order is, or a set of operating targets in which the order does not need to be considered.

Although automatic operation is performed by setting these operation targets, if some abnormal situation occurs in the plant, some of the functions that maintain the state quantity do not satisfy the demand, and as a result, The operation limit target is set by the above, and the previously set operation target is suppressed by this operation limit target.

Thus, in the automatic operation management method of the present invention, based on the relationship between the state quantity and the function in the plant, it is possible to derive an appropriate operating procedure regardless of the operating state of the plant, so in an abnormal situation It becomes possible to operate the process plant fully automatically.

(Embodiment) Hereinafter, a method for automatically starting a boiling water nuclear power plant as an embodiment of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows the relationship between the state quantity and function at the time of starting the boiling water nuclear power plant, which is necessary for deriving the operating procedure, and the safety evaluation. The state quantity is an important plant parameter for starting the power generation plant, and here, the output level 1, the turbine condenser vacuum degree 2, and the furnace pressure 3 are selected.
The safety evaluation is an evaluation of the operating condition of the power plant from a safety point of view. The external emission radioactivity 4, the margin 5 for emergency core cooling, and the reactor water condition 6 considering the concentration of dissolved oxygen in the reactor water are Subject to evaluation. The safety evaluations depend on the exhaust gas treatment capacity 7, the emergency cooling capacity 8, and the reactor water purification capacity 9, respectively. On the other hand, the function is expressed by operating the device, and for example, the function of water supply capacity is expressed by activating the water supply pump. In the relationship between the state quantity and the function, what is connected by the dotted line indicates that the function must be exerted in order to maintain the state quantity, and if it is connected by the solid line, it is realized. It shows that the function to be performed depends on the state quantity. That is, output level 1
The pressure control ability is 10, which is necessary to maintain
There are operation mode switch management capacity 11, output measurement capacity 12, and water supply capacity 13. Sealing capacity 14 and exhaust capacity 15 are required to maintain condenser vacuum level 2, and reactor pressure 3 is maintained. Decompression prevention capability is a necessary function
There are 16. On the other hand, since the power generation capacity 17 depends on the output level 1 and the condenser vacuum degree 2, it is connected with each other by a solid line, and the exhaust gas treatment capacity 7 and the emergency cooling capacity 8 also depend on the reactor pressure 3 so that the solid line shows. Tied together. Note that each safety evaluation is connected to the output level 1 by a solid line. When the output level 1 is low, it does not matter even if the safety measure function is not working sufficiently, and the safety evaluation is satisfied. This is because

As described above, FIG. 1 shows the relationship among the three parties necessary to maintain the state quantity of the power plant. However, when attempting to shift the power plant to the target operating state, the target quantity of the state quantity is set. The state quantity to be changed is selected in comparison with. Figures 2 to 5 show the plant that determines the state quantity to be changed from the mutual relationship among the three state quantities of condenser vacuum, reactor pressure, and power level, with respect to the final goal of starting the power plant. It shows the driving strategy. These figures are those defined in a three-dimensional space with three state quantities as coordinate axes, cut by four planes with a constant output level. The output levels in each figure are the neutron source region, Intermediate range, about 10% of rated output, 15% or more of rated output.
In each figure, the degree of vacuum and furnace pressure are small, medium,
The driving strategy selected according to each state quantity was displayed in three stages of achieving the target. There are the following six driving strategies selected here.

Power rise, Reactor water temperature rise, Vacuum degree rise, Reactor pressure rise, Power fall, Scrum In normal operation, the first three measures are taken, and the latter three measures are used when something goes wrong. .
For example, although the reactor pressure normally rises due to the increase in the output, when the reactor pressure does not increase despite the output is to some extent, a measure for increasing the reactor pressure is adopted. This measure investigates whether or not there is a hindrance to the rise in the furnace pressure, and if not, increases the power output. Also, the measure to reduce the output is adopted when the condenser vacuum level or furnace pressure is not sufficiently high even though the output level is relatively high, and the generated energy cannot be converted to electric output. To be done.

The driving strategy determines the state quantity to be changed,
The operating procedure for changing the state quantity is derived and expressed in the form of an operational goal in order for each state quantity, based on the relationship among the state quantity, the function, and the safety evaluation shown in FIG. It
For example, the operating procedure for increasing the output can be described by the expressions shown in the following table.

The data shown in the table are for setting the operation target of the output increase in the host control system that controls the control rod operation or the recirculation operation for increasing the output. Explaining the individual descriptions, (22-1) to (24-1) show conditions in which the reactivity operation for increasing the output is not performed. (22-1) indicates the operation to make the core subcritical if drywell inspection is in progress, and (23-1) and (24-1) indicate that a turbine and a generator are installed together. If it is, it means that the reactivity operation for increasing the output is not performed. (25−
The operation target for increasing the power is set from 1) onward, and in (25-1), when the core is subcritical, the operation target is set to make the core critical. In (26-1), when the reactor water temperature is 100 ° C or lower, an operation target for setting the reactor water temperature to 100 ° C is set. In (27-1), if the furnace pressure is 30 kg or less, set the furnace pressure to 30 kg as the operation target. (28-1)
If the furnace pressure is 30kg or more, if the first dry well inspection has not been carried out, a guide will be presented to perform it, and if the inspection is completed, the furnace pressure should be 50kg or less. For example, set the furnace pressure to 50 kg as the operation target. (29-1)
If the furnace pressure is below the rated pressure, set the furnace pressure rated pressure as the operation target. (30-1) is APRM (Average Power Range)
If the value of (Monitor) is less than or equal to the lower limit value, the operation target is set to increase the output until it becomes a value slightly above this value. When the turbine bypass valve opening is equal to or less than the set value, (31-1) sets the operation target to increase the output until it reaches a predetermined value. (32-1) sets the operation target to increase the output to 20% when the APRM count value is smaller than 20% while the generator is operating. Similarly, (33-1) sets the operating target to increase the output to 40%. (34-1) sets the operation target to finally increase the output to 100%.

In addition, the operation target written in the lower part of the table is realized only when all the conditions in the upper part are not satisfied. For example, in order to set the operation target of the output increase up to 20% shown in (32-4), all the conditions existing before this need to be denied. That is, the reactor water temperature is 10
The temperature is 0 ° C or higher, the furnace pressure is the rated pressure or higher, the APRM value is the lower limit or higher, and the turbine has already been installed.

FIG. 6 shows a system for automatically operating a plant according to the automatic operation management method of the present invention. In the figure, reference numeral 10
Reference numerals 1 and 102 denote a plant and a control system for controlling the plant, respectively. Then, the automatic driving system, the data corresponding to the operation procedure for realizing the function leading to the generation of the operation target, for example, the operation procedure data section 103 in which the data shown in the above table is stored, the plant 101 and the control. An operating state monitoring unit 104 that monitors the state of the system 102, an inference unit 105 that inputs an operating state from the operating state monitoring unit 104 and determines an operating target based on the data of the operation procedure data unit 103, and this inference unit There is a required operation target section 106 that inputs the operation target set in 105 and sets the control system set value or starts the equipment, and the state quantity that should be restricted in the reasoning section 105 for reasons such as safety evaluation. The operation restriction target unit 1 that records the derived operation restriction target when it is determined that the operation target of the required operation target unit 106 previously set by this is restricted.
Composed of 07 and.

When starting a boiling water nuclear power plant, a normal operation procedure is derived as follows.

First, the equipment that exhibits the exhaust gas treatment capacity 7, the emergency cooling capacity 8, and the reactor water purification capacity 9 is activated by the safety evaluations 4, 5, and 6 in FIG. These functions are required at the time of high power levels and may not be needed at the beginning of start-up, but this is in compliance with the operating standards of the power plant.

Once the functions for satisfying the safety evaluation shown in Fig. 1 are secured, output level 1, condenser vacuum degree 2, and furnace pressure 3
The individual state quantities are evaluated and the driving strategy is selected as shown in FIGS. Since the reactor pressure (reactor water temperature), the degree of vacuum, and the output level are low at the initial stage of startup, the operation corresponding to the rise in the reactor water temperature and the rise in the condenser vacuum is carried out from FIG. It should be noted that it is confirmed that the neutron measuring instrument suitable for the current neutron flux level is inserted, though the control rod operation is not performed because the operation measure corresponding to the output increase is not adopted.

Then, when the reactor water temperature is 80 ° C. or higher and the degree of vacuum is 50 mmHg, the output is increased, that is, the control rod is pulled out. The vacuum degree is also raised at the same time. Here, when the driving strategy for increasing the output is selected, the output increasing operation as shown in the table is executed from above. For example, if it is confirmed by the operation state monitoring unit 104 that the turbine is in the process of being inserted, (23-1) is established, and thus the output increasing operation is not performed.

Output increases as the operating strategy, but the same time the furnace pressure increases, the furnace pressure is 20kg / cm ^2, MDRFP than the first figure as ensuring water supply capacity (Motor Driven Reactor Feed
WaTer Pump) needs to be started. In this way, the equipment that secures or uses the state quantity in response to the change in the state quantity is activated, and the operating state targeted by the plant is entered.

Next, consider starting immediately after scrum. Although it depends on the cause of the scrum, if both the degree of vacuum of the condenser and the furnace pressure are in the target states, the operation for satisfying the safety evaluation shown in FIG. 1 is first executed in this case as well. Then, a driving strategy for increasing the output is selected and the control rod is immediately withdrawn,
At the same time, the operation for maintaining the pressure and the degree of vacuum is executed. However, taking water supply capacity as an example, the TDRF
When P (Turbine Driven Feed Water Pump) is operating, it is judged that the water supply capacity is secured, so MD
RFP is never activated.

As is clear from the above description, the operating procedure of the plant is derived from the relationship between the state quantity and the function of the plant shown in FIG. Since this relationship must be satisfied in any plant condition, the operating procedure is synthesized from any condition.

[Effects of the Invention] As described above, according to the process plant automatic operation management method of the present invention, it is possible to derive an appropriate operation procedure regardless of the operating state of the process plant. By using it, fully automatic operation of the process plant becomes possible.

[Brief description of drawings]

FIG. 1 is a diagram showing the relationship between the state and function of a boiling water nuclear power plant and safety evaluation, and FIGS. 2 to 5 are diagrams presenting operational strategies selected from the interrelationship of three state quantities. FIG. 6 is a block diagram showing the configuration of a system for carrying out automatic operation of a plant by the method of the present invention.

Claims (1)

[Claims] 1. A main state quantity that represents the operating state of the process plant with respect to the final goal of the process plant, a safety evaluation that is evaluated as an operating condition that must be satisfied in terms of the safety of the process plant, and the main state. Quantity required and / or dependent on each to ensure safety assessment,
In addition to clarifying in advance the relationship of the three with the function that appears due to the operation of the equipment, predefine a driving policy that defines the state quantity to be changed from the mutual relationship of the main state quantities,
The operation procedure for the final goal is to ensure a function that satisfies the safety evaluation, and then to change the predetermined state quantity according to the operation policy selected according to the operation state of the process plant, An automatic operation management method for a process plant, characterized by deriving an operation target for each state quantity based on the relationship between