JPS6043702A - Plant operation monitor controller - Google Patents

Abstract

PURPOSE:To obtain a controller which improves the monitor function within an operating range of a control system, detects an operation state which is expected to be out of the operating range to give an alarm and guidance for an operation within a designated range and also blocks an operation that is carried out in a dangerous state. CONSTITUTION:A reactor output control system performs its operation while keeping the relation between the heat output P and the flow rate F of the reactor core so as to avoid deviation from an area 3 of a P-F map. An operation monitor controller 11 receives a plant signal (a) and a signal (b) given from a controller 17. Then a state deciding part 13 decides the state of a plant from a plant signal (c) and delivers a state (d). Based on this state (d) and the signal (c), a state changing direction calculating part 14 calculates the changing direction and extent of the state to obtain a state change (e). A control signal suppression deciding part 15 decides the safety of operation from the change (e) and the state (d), and a control rod pull-out preventing signal and a permission signal (g) are delivered to a plant monitor control part 16 to calculate the propriety of control and the control amount. Then a contro lsignal (h) is delivered to a controller 17. The control is changed by discriminating whether the changing direction of the plant state gets close to or away from a boundary line 7 or is kept in parallel.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a plant operation monitoring and control device that performs monitoring and control in consideration of changes in the state of the plant.

[Technical background of the invention and its problems]

A plant control device controls a controlled object in response to changes in side leg command values and changes in plant status. What kind of accuracy is controlled by such a control device, what kind of response time does it react, and how does it respond to step input (2), depending on the relationship with the plant? There are conditions that the control device must meet.

The operating range of a control device is one of them, and in order to protect the health of the device as well as the health of the plant to be controlled, the device usually has a defined operating range within which it is allowed to operate. This operating range is given as the settable range of the first section of the command to the control device, as the range of parameter values of the controlled object, or as the range of values of the control device's own parameters such as heat generation. Do the prescribed things.

When operating such a device, it is necessary to control it within an allowable operating range in order to ensure the safety of the plant, maintain its health, and protect property.

Therefore, even during normal operation, monitoring is carried out to make sure that the operating state does not deviate from the allowable range, and in the event that it does deviate, measures such as stopping the operation are taken.

However, with this type of monitoring method, there is a complaint that abnormal conditions cannot be detected until after the operating condition actually deviates from the second allowable range. , if the second operating range is exceeded, a warning will be issued, a constant shift control will be carried out, or the City 11
Some wholesalers have also been discontinued. but,
Even in such a case, the control range is effectively reduced (= not deviating from the operating range (-i[tlJ
It is desired to improve the method of rllll.

For example, the reactor power control system of a boiling water nuclear power plant (
The control of the reactor power in two reactors is usually 1UIJ (jl
This is done either by the rod or the recirculation flow rate, or by a combination of both.
The reactor thermal output P and core flow rate F are shown in the power-flow diagram (hereinafter referred to as P
- It is necessary to drive while maintaining a relationship that falls within the indicated region 3 (referred to as F-up).

Here, among the boundary lines that make up region 3, boundary line 4 is based on the characteristic curve when the control rods are operated in a natural circulation state with the recirculation pump stopped, and is the region where the reactor becomes unstable. This is a boundary line drawn outside area 3.

Boundary line 5 indicates the recirculation flow if the control rod pattern is constant.
: Based on the characteristic curve when the recirculation pump is turned into a This is the boundary line defined by C2 based on the characteristic curve when the control rods are operated with the recirculation pump in operation. Boundary line 7 is based on the characteristic curve when the recirculation flow rate is changed in the state of the control rod pattern to achieve the rated reactor output, and the area that affects the integrity of the fuel rods is outside of area 3. It is a boundary line drawn to ensure that

In this way, each boundary line that makes up Area 3 has a meaning, and operation that deviates from this will have an adverse effect on the plant condition or plant equipment (2), and the nuclear reactor operation (1). The P-F map of As a result of these changes in Zeno byproducts (-), the reactor output changes further and is accompanied by a time delay, so it is difficult to control the output, especially to operate while maintaining it within Region 3 near boundary line 7. Requires skillful technique.

Recently, as the need for load following operation has increased even at two nuclear power plants (-), the output fluctuations (1
The accompanying change in Zenone concentration becomes large, and in the high load state of load following operation, the output is often close to the rated output, so it is inevitable to operate near the boundary line 7 of the P-F map. It becomes.

Therefore, the importance of monitoring and controlling the operating range is becoming more and more important.

Under these circumstances, control devices and process computers also monitor the operating range, and if the plant's operating status deviates from Area 3, an alarm is issued or automatic control is corrected to improve the plant's performance. I'm trying to stay sane.

However, this monitoring method has a problem in that a warning is not generated unless the vehicle actually deviates from the operating range. In addition, as another monitoring method, if the operating state enters area 8 near boundary line 7 (2. There are supervisory control methods, but such methods can limit the actual operating range. desired.

[Purpose of the invention]

The purpose of the present invention is to improve the monitoring and control function of the operating range of the control system, so that it can detect operating situations that are expected to occur outside the operating range (1), and enable operation within the specified range (= generate a warning/guidance). Therefore, the second objective is to provide an operation monitoring and control device that blocks operations in two dangerous directions.

[Summary of the invention]

The present invention applies when the operating state of the plant is within the operating range near the operating range boundary line (2. When the direction of change in the plant state is not a change in the direction that deviates from the operating range (= means that normal operating control is continued. , in the case of a change in direction that poses a danger of deviating from the driving range, only the output of a control signal heading in the direction of departure is blocked, and the output of a control signal heading in the opposite direction is permitted; It is characterized by monitoring and controlling the output of a control signal in a specific direction by taking into consideration not only the current operating state of the plant but also the direction in which the state of the plant is changing.

[Example of invention]

Hereinafter, one embodiment (two embodiments) of the present invention will be explained.

This embodiment is an example in which the operation monitoring and control device of the present invention is applied to a reactor power system of a boiling water nuclear coupler.

The reactor power control system must be operated while maintaining the relationship between the reactor thermal output 1 and the core flow rate 2 so as not to deviate from region 3 of the P-F map shown in Figure 1. In the operation monitoring control device 11 of the reactor power control system shown in FIG.
A signal a from the atomic couplant 10 including the control device 1
Input the signal from 7. Plant status determination unit 13
Then, based on the plant signal C from the plant signal input section 12, the plant state is determined, and the plant state d is generated as an output.

Based on the plant state d and the plant signal C, the state change direction calculation unit 14 calculates the state change direction and magnitude of the plant to obtain the state change e. Control signal suppression determination unit 15
Then, the plant state d determined by the plant state determination section 13 and the state change direction calculation section 14 determine it 'i n k 77
7"(7) 9a!(!°t""°・47, The safety and danger of continuation of 1st grade is judged, and the plant monitoring and control unit 16 (2,
It outputs blocking signals and permission signals g such as a recirculation flow rate increase blocking signal and a control rod withdrawal blocking signal.

The plant monitoring and control unit 16 calculates whether or not control is possible and the amount of control based on the control prevention signal/permission signal g and the control input signal l, and calculates whether control is possible or not and the control amount, and calculates the control device 17 including a recirculation control device and a control rod drive control device. Outputs a control signal to the

, now, if the input signals of the reactor thermal output P and core flow rate F of the nuclear coupler 10 at time t are Cl11 and C2n, respectively, the plant state determination unit 13 outputs clf
il C2n and the P-F map showing the operating range. Time 11. - The plant state dn in the two positions is added,
. Letting the function for determining the plant state be f,3, the plant state d, can be written as follows.

dn ” fu (eln + etn) Now, considering the monitoring and control near the boundary line 7, the plant state dn is either region A, which is the outer region of operating region 3 on the P-F map, or Either region B, which is the inner region and the boundary line vicinity region 8 (that is, region 8 itself), or region C, which is the inner region of the driving region 3 and is not the boundary line vicinity region 8. It can be expressed as a region. Now, suppose that the plant state d exists within region B, that is, the region near the boundary line.

At this time, the time is earlier than time t11-1 (the reactor thermal output P and core flow rate F of the nuclear coupler 10 at 2).
The input signals of are expressed as 011□ and C2n-1, respectively. Reactor thermal power P and core flow rate FL7) changes between time jn-1 and t, respectively △can l△C2
If n, eln :l! b + - 1 + Δ0111 (j2n = e!ll-1 + △C2u. Therefore, if the state change at this time is expressed as 1 as a vector, then the state change will be as follows. Calculate the state change direction. The calculation function of part 14 is f+4
Then, “ ” fr4(ΔC!III l△C2n )” f
n ((+n-+ l C21+-t + Crn +
eln, and the output of the state change direction calculation unit 14 is obtained.

The control signal suppression determining unit 15 determines that the plant state dn is a point on the P-F map indicated by the plant state dn (e2n+cl
Find the direction kn of the boundary line 7 at the point (2) on the boundary line 7 closest to n). That is, == f7 (el++) (!211).Here, 1st is in the plant state d. Neighborhood boundary line 7
This is a function that determines the direction of . Furthermore, the iti control signal suppression identification unit 15 determines the direction of the boundary line created in this way.
Based on the direction of the state change C, it is determined whether the direction of change in the plant state is approaching the boundary I freezing 7, moving away from it, or maintaining parallelism. Based on the judgment VT result (1)
If the direction of the changing material in the plant state approaches the boundary M'it2 (second, the control signal suppression determination unit 15 outputs g. Then the recirculation 61t) outputs an increase prevention signal, and (11) changes the plant state. If the direction of the change C is parallel to or away from the boundary star 7 (2), the blocking signal is canceled and the plant state (2) is determined to be controlled without constraints.

The above is a case where the plant state, state d0, exists in region B, which is the region near the boundary line (I have considered two, but (+ * 1)
If the plant state d is outside the operating range A (-, the control signal suppression judgment unit 15 outputs an output gI that instructs the plant monitoring control unit 16 to generate an alarm and cancel the automatic '1IIIJ control operation. (1v) The plant state dn is in the area C(
If there are two (2), release the blocking signal and plant status (
An output gn is generated that allows two-way control to be performed without any constraints. If the logic of [these judgment parts] 5 is f15, go = fts (dn + en + kn) =
ftj(eln-1+ (!2n-1101rl+ (
! 2+1).

As mentioned above (2. The direction of change in the state is also checked, and if the direction is not to deviate from the operating range (2), continue operation without constraints, and if the direction of change in the plant state is to deviate from the operating range (2), the direction is to deviate from the operating range. Block only the control signal output towards the
By allowing the control signal to be output in the opposite direction, control including taking recovery measures without delay is possible.

Although the above embodiment is an example in which the present invention is applied to a reactor output control system for a boiling water nuclear coupler, other control systems such as a water supply control system (2) can also be applied. It goes without saying that the FT1LL/NL system can be used for plants other than boiling water type atomic couplants, such as peeping plants and chemical plants.

In addition, in the above-mentioned embodiment, the case where there is only one boundary line of interest and only one area near the boundary line is shown, but as shown in FIG. Then, determine the vicinity area of each boundary line, and perform the same processing as in the example shown above for the vicinity area determined from the plant state and its boundary line (from the second point, it is necessary to A monitoring and control device with an operating range diagram can also be realized.

In addition, even if the area near the boundary line is determined in the area where area B and area F overlap as shown in FIG. and boundary line 6 (two configurations that make judgments for control and signal suppression, respectively, and generate an output g on the more severe side, that is, on the safer side) Exactly the same as Nomi/Ryu side.

Further, although the driving range has been defined as a two-dimensional area, the dimension indicating the driving range is not limited to one or two dimensions, and may be a general n-dimensional area. For example, in the case of the three-dimensional area 210 shown in FIG.
It goes without saying that if you consider the direction of the boundary line as the direction of the boundary surface, you can use exactly the same idea and obtain the same effect□.

As explained above, the present invention, as a plant operation monitoring and control device, examines the operating status of a plant, and when the status is close to the boundary of the allowable operating range (-, = indicates the direction of change in the plant status). If the change is not in the direction of deviating from the operating range, normal operation and control will continue, but if there is a risk of deviating from the operating range (- indicates a change in the direction of the control signal) For example, only the output is blocked and the output of control signals that go in the opposite direction is allowed. , monitoring performance is improved, and it is possible to suppress operations that may deviate from the operating range; in addition, it is possible to perform control in the direction of safety, and control when the five directions of changes in the plant state are in the direction of safety. Since driving is not restrained, dangerous driving (2) can be dealt with while maintaining driving margin, and eventually control r + 14
It is possible to obtain the effects of extending the life of one piece of equipment, improving the operating rate of the control device, and improving the plant operating rate.

[Brief explanation of drawings]

Fig. 1 is a characteristic diagram showing the operating range of brats, Fig. 2 is a configuration diagram showing an embodiment of the monitoring and control device of the present invention, and Fig. 3 is a standard for determining whether or not the operating range is exceeded. FIG. 4 is a characteristic diagram of the operating range without showing the lifting load/reliance with an expanded application range, and FIG. 5 is a characteristic diagram of the operating range showing still another embodiment. 3... Operating area 4, 5.6.7... Boundary line 8... Boundary line vicinity operating area 10... Atomic couplant 11... Operation monitoring control device 12... Plant No. 18 input section 13... Brandt state publication i1... Sagi 14... State liquefaction direction calculation unit 15... Control signal suppression determination unit 16... Plant monitoring control unit 17... Control device 21... Operation area ( 3D) ・1,・. (7317) Agent Patent Attorney Nori Chika Akusuke (and 1 other person) Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] There is a plant signal input section that inputs plant signals such as plant status trays and process quantities, and a plant signal input section that determines the state of the plant based on the signals inputted from this plant signal input section. a plant state determination section that makes a judgment as to whether the plant state has changed, and a JJf direction same direction calculation section that calculates the direction of the state change of the plant from the result of the plant state determination section and the signal from the plant signal input section. A Ti1l control signal control side determination unit that determines control methods such as connection/discontinuation of control and output control of a specific control signal based on the calculation results of the calculation unit and the results of the plant state determination unit, and the rlIfj moaning signal suppression determination unit. A plant operation monitoring and control device comprising a plant monitoring system that monitors and controls the plant based on the results of the first section and the input No. 18 of the previous plant signal input section.