JPS61101812A - Plant state display device - Google Patents

Abstract

PURPOSE:To evaluate accurately and easily the complete state of important parameters in plant operation and supervision by supervising a rate of change of the parameters, its direction and the present value additionally in informing the alarm state of the parameter to a supervisor. CONSTITUTION:A process data inputted by a process input device 12 is subjected to rate of change calculation 13, its output is fed to an alarm area decision device 29, result of decision of alarm area is outputted based on limit values A1, A2 and sectioned into plural area by an A/D converter 30-2 and outputted to an adder 31. On the other hand, the data from the device 12 is inputted also to an alarm decision device 27 to the present value, the result decided based on limit UL, CUL, LL, CLL is converted into plural region signals by an A/D converter 30-1 and outputted to the adder 31. Then the region signal added by the adder 31 is inputted to alarm discriminators 32, 33 and outputted (35,36) as variable alarm in response to the decided alarm state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a plant status display device including display means for displaying changes in plant status quantities using symbols.

[Technical Background of the Invention] For example, in an atomic coupler plant, a plant status display device is provided in the plant as one means for operating the plant safely and efficiently. This device is
This device constantly displays information on important parameters necessary for monitoring reactor output, reactor water level, etc. during an accident and during normal operation of the nuclear couplant, and the status of the nuclear couplant 1- can be monitored through this device. According to
The safety status of the plant can be evaluated, and two things can be done to help ensure safe operation.

2. The plant status display device is provided with various display screens, of which the screen called the primary display is always displayed during normal times and during accidents.
It plays an important role in monitoring. A conventional example of the display method of this primary display is shown in FIG.

In FIG. 3, information regarding the current values and rates of change of important parameters 1 to 6 is displayed on the 7 primary display 100. The current value is shown by a par chart and a numerical display, and the rate of change is shown by a numerical display 7 and its direction by arrows 8 and 10. Also, if the rate of change is zero (and near zero), is it strange? A horizontal bar 9 is displayed to indicate that there is no hit.

Now, this alarm judgment is processed as follows. In other words, the current value is the two-limit value (U
L) and lower limit value (L) are set in advance, and if this limit value is exceeded, the display color is changed to red to indicate a warning in order to alert the supervisor.Similarly, the rate of change is also normally In order to distinguish between the state and the alarm state, the colors of the arrows and numerical display are changed. Note that this arrow display merely indicates the direction, and has nothing to do with alarm determination or the magnitude of the rate of change.

Further, the determination of whether to change the color of the arrow has conventionally been performed as follows. That is, as shown in FIG. 4, process data 11 (
f) is taken into the change rate calculation device 13 and used for the change rate 81 calculation. The rate of change per fixed period is df/
dt, is performed by least squares calculation within the period. For this df/de, a rate of change alarm level set value 15 (A) is set.

l df/de 1≧A ...(1
), it is determined that the rate of change is abnormal, and one display color is changed (→red). This determination is made by the alarm determination device 14, and if the determination results in an alarm state, an alarm is output.

[Problems with the Background Art] As described above, in the past, the alarm determination for the rate of change df/dj was performed simply by comparing the magnitude with a limit value, as in the case of the current value. For this reason, the following problems have arisen.

Now, this is shown in Figure 3. Loss of reactor coolant accident (LOC)
This will be explained using an example of monitoring the reactor water level during A).

FIG. 3 is a schematic diagram of the reactor pressure vessel and shows transient changes in the reactor water level during LOCA. The pressure vessel 17 is a diagram showing the case of a boiling water reactor (BliR).

Since it is a BWR, the reactor water is completely contained within the pressure vessel;
- Not filled 1 Normally, the reactor normal water level is 18. Reactor water level depends on reactor performance.

The water level is controlled because it must be kept constant at all times. The reactor water has the role of receiving and taking the decay heat generated by the nuclear reaction in the reactor core 19 and taking it out to the outside of the reactor, and the reactor core must be always covered with reactor water.

Therefore, if we consider the case where a complete rupture of the reactor's recirculation piping occurs, the reactor water level will drop.

In the worst case scenario, the reactor core could be exposed.

As a result, the decay heat generated by the above-mentioned nuclear reaction is not removed, leading to damage to the fuel rods due to overripe, and radioactive materials being released outside the reactor.

Thus, the reactor water level is an important monitoring parameter in terms of reactor safety and performance. A curve 22 shown in the graph of FIG. 3 represents changes in the reactor water level in the event of a rupture accident in the reactor recirculation pipe. The graph shows time on the horizontal axis and water level on the pIi axis.

From this graph, it can be seen that when a pipe rupture occurs, the reactor water level starts to drop rapidly, passes through the effective fuel rod top 20° and the effective fuel rod bottom 21 at once, and then the entire core is exposed. When the reactor water level drops, the ECC5 system is automatically activated by the “reactor water level low” signal, and around 23:00, the high pressure core spray system (HPC5) starts to inject water into the reactor, followed by the LPC5 (low pressure Water injection into the reactor core spray system will also be carried out. As a result, the reactor water level is 24
Recovery began in the vicinity, and the entire core was submerged again at 25:00. It can be seen from this figure that the water level change rate R from the water level rise starting point 24 to the core re-flooding point 25 is quite large.

Therefore, when considering the above-mentioned limit value A of the rate of change, since the reactor water level normally does not change significantly within the M rotation range, A is also set small accordingly. Therefore,
In the section from 24 to 25, where the water level is recovering, the rate of change R is clearly larger than the limit value A, and the arrow is switched to red indicating a warning. However, when considering the actual situation of the plant, the section from 24 to 25 is a process in which the reactor moves from a dangerous state to a safe state, and it can be said that it is rather desirable that the rate of change in water level during this period be large. Therefore, it is not appropriate to judge the alarm state of the rate of change during this period simply based on the magnitude of the rate of change, considering the actual safety state of the plant.

Further, the same thing can be said when the water level decreases from a high reactor water level to a normal water level.

On the other hand, in the case of the radiation monitor for the important parameters indicated by 6 in FIG. 1, the smaller the dose, the safer the safety state, so there is no need to display an alarm for the rate of change in the decreasing direction.

In this way, when monitoring the rate of change of a parameter, simply comparing it with a limit value, as in the case of monitoring the current value, provides incomplete information for evaluating the actual safety state of the plant. Because it is.

There is a need for a reactor safety status monitoring system that organically monitors changes in parameters in accordance with the actual state of change.

[Object of the Invention] An object of the present invention is to provide a plant status display device that can more accurately and easily evaluate the complete status of important parameters used for monitoring plant operation.

[Summary of the Invention] The present invention provides a method for displaying the rate of change of a parameter displayed on the primary display of a plant status display device. ! In addition to the magnitude of the rate of change, the direction and current value are also included in determining the switching of the display color to notify the monitor of the alarm status, and the size of the arrow indicating the direction of change is determined according to the magnitude of the rate of change. It is also designed to be displayed variably.
[Embodiments of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows a configuration diagram of a parameter change rate display determination means in an atomic couplant status monitoring device according to an embodiment of the present invention, and FIG. 2 shows each parameter change rate determined by the display determination means. FIG. In addition.

In FIG. 2, G is displayed in green, R is red, and ■ is yellow, and the characters G, R, and '/ are not displayed. In these figures, process data input by a process input device 12 for capturing process data 11(f) enters a rate of change calculation device 13 that calculates a rate of change based on the process data, and the result is a rate of change. is inputted to the warning range determination device 29 for. This alarm range determination device 29 has limit values At, A for alarm determination.
2 is also input. As a result, the alarm area determination device 29
An alarm judgment device based on the limit value is outputted from , which is converted to 0.0 by the A/D converter 30-2. ±1. ±2. ±3
This value is output to the adder 31.

On the other hand, the data input by the process input device 12 is also input to the alarm range determination device 27 for the current value. This alarm range determination device 27 has limit values IJL and CIJL for alarm determination as shown in FIG.

LL and CLL are also input, and the result of determination based on these is determined by the A/D converter 30-1 as 0. ±1
．． ±2. It is converted into a ±3 area signal and output to the adder 31.

The area signals added by the adder 31 are input to alarm determination devices 32 and 33, and alarms 35 and 36 are outputted depending on the results determined by the key 1j, respectively. Note that 34 is an interlock signal for cutting off the output of 36 when the alarm 35 is output.

In the configuration shown in FIG. 1, process data 11(f) is input to the rate of change calculation device 13 via the process input device 12. The rate of change calculation device 13 calculates the rate of change based on human data. The change rate 2i-i' calculation is performed by the least squares method using several points (about 6 points) of process data scanned at a constant cycle.

This change rate calculation is also performed periodically, and the result is df/d
H is also output to the W root range determination device 29 at this timing.

This alarm range determination device 29 has a limit value 28 for 1 determination.
(AI, A2) is given in advance. Additionally, an allowable error iJE in rate of change calculation is also set. In the alarm range determination device 29, conversion processing between the rate of change and the alarm amount is performed according to these set values. In other words, the data input at the rate of change is set to the alarm amount O1±1. ±2. Convert to ±3. concrete t
This is done in the next calculation.

△=A2-A1=AI-E >O...(2),
Set AI and A2 to satisfy the above formula 6 In other words,
As shown in Figure 2, by setting a constant span Δ, the rate of change axis d
Set At and A2 in the f/dL direction 6 Then, R=df/dt...
- Putting (3) in place, find the alarm amount X using the following formula (4).

Here, since R has a difference between 1 and 2 depending on the direction of change of the parameter, the alarm amount X also has a difference between 1 and 2.

The alarm amount X obtained in the above manner is
It is input to converter 30-2.

When the alarm amount X is input to this A/D converter 30-2,
The following processing is performed to quantize the alarm amount X.

(1) 3≦X → 1=3 (2) 2≦X<3 → I=2 (3) 1≦X<
2 →I=1 (4) −1<X<1 →r=.

(5) -2<X≦-1→I=-1 (6) -3<X≦-2-+ I = -2(7)X
≦-3→engineering=-3 In other words, the alarm amount X input in the form of x, xxxxxx... is changed to 3, 2, 1, 0, etc. according to the above. -1.
-2. By replacing it with an integer value of -3, the rate of change R is converted into a warning area number I represented by seven types of integers.

On the other hand, the process data 11(f) input by the process input device 12 is also input to the warning range determination device 27. In addition to the allowable error δ, limit values 26 (UL, CUL, LL, CLL) are set in advance in this alarm range determination device 27, and similarly to the above-mentioned alarm determination device 29, the alarm amount Y is required. Note that this limit value depends on the nature of the process data 11(f) [JL and LL do not necessarily have to be relative to the standard value.

Δu = l UL-C [JL I = I CUL
−(NV+δ)l −(5)LL =lLL−CL
Ll=ICIl-(sv-δ)l-(6) Here, NV=standard value (value taken by parameter f in normal state) When f-NV≧0; When f-NV<O; Obtained by the above The alarm amount Y thus obtained is input to the next stage A/D converter 30-1, and the next processing is performed.

(1) 3≦y −+ J = 3(2
)2≦Y<3 →J=2(3)1≦(J<2
→J-1(4) -1<Y<1
→J=0(5) -2<Y≦-1→Jkony- (6) -3<Y≦-2→J=-2 (7)Y≦-3→Jkony- The J thus obtained is , becomes the alarm area number for the current value. This J and the above-mentioned work are input to an adder 31, where the sum of both is taken, and an alarm judgment value K is calculated.

K = I + J ... (9) Here, since -3≦I and J≦3, -6≦≦6
Takes an integer value in the range of . This K is input to alarm determination devices 32 and 33, and the alarm state is determined in each of them.

The alarm judgment device 32 checks the value of K and determines that IK+≦3.
...The alarm output 35 is output in (10). This corresponds to the arrow display color red H.

The alarm determination device 33 similarly checks the value of K.

IK+≦2...In (11), the alarm output 36 is output. This corresponds to the display color yellow Y. Note that the output 36 is cut off by the alarm output interlock 34 when the output 35 is ON.

Next, the change rate display method of this embodiment will be explained with reference to FIG. In the figure, the vertical axis shows the current value f of the parameter, and the horizontal axis shows the rate of change df/dt. This f and df/
The plane determined by d is defined by each limit value (UL, LL
, AI, A2) and t, NV+δ, totaling 7
It is divided into X7=49 blocks. The positions of these blocks can be specified by the first report area numbers I and J obtained previously. For example, I=3. The block with J=3 is df/
dj≧A2. This is an area where f≧UL. Then, a warning determination is made in units of these blocks.

The display symbols representing the rate of change are four types of symbols 39 to 42, and each symbol is switched depending on the magnitude of the rate of change. The conditions for this switching are determined as follows based on the previously determined alarm area number I.

(1) I=0 → Display symbol 39 (horizontal bar) (
2) ■-±1 →Display symbol 40 (in case of -, it becomes a downward arrow) (3) I=±2 →Display symbol 4
1()(4)■-±3→Display symbol 42() In other words, in FIG. 1, the larger the block (left end and right end block) is, the larger the size of the arrow is displayed.

Therefore, the symbols of the arrows are switched in the left and right directions, and the symbols in the vertical axis direction are the same.

Next, the display color of the arrow is switched between green, yellow, and red according to the three states of safety, caution, and danger of the movement of the parameter. The above-mentioned alarm judgment value K is used for this condition judgment. Since is the sum of ■ and J, it can be determined that the larger the value of is, the more dangerous the parameter movement is. For example, (a) If ■ = 3 and J = 3, then = 6 The current value deviates from the upper limit, and the rate of change is also large in the increasing direction, so the degree of risk is extremely high.

(b) In the case of I=-3 and J=3, the current value of K=0 deviates from the upper limit, but since the rate of change is large in the decreasing direction, it can be said that the movement is safe.
It is possible to make a determination such as 1.

That is, the alarm determination device 32 when the above-mentioned formula (10) is satisfied.
As a result of the output, the symbol of the block indicated by diagonal lines is displayed in red R. On the other hand, if the formula (11) is satisfied, the yellow Y is displayed to notify the caution state.

All symbols other than this, that is, blocks with IK+≦1, are displayed in green G.

To further explain the case where this is applied to the display when the reactor water level changes during LOCA shown in Fig. 5, first,
When the reactor water level rapidly drops after a pipe rupture, the parameters indicating the reactor water level rapidly decrease from normal values to dangerous directions, so the red corresponding to the blocks I = -3 and J = -3 A large arrow will be displayed. Next, when the reactor water level decreases to a certain extent, the decrease stops due to the operation of the ECC5 system, and the water level is maintained at a constant level for a while (points 23→24 in FIG. 5). Therefore, in this range I=0
．． Corresponding to the block J=-3, the red horizontal bar (symbol 3
9) will be displayed. Furthermore, water injection by the ECC5 system continues, and the reactor water level is heading toward recovery. Since this range corresponds to I=3°J=-2, a green upward arrow (large) is displayed. Furthermore, when the water level continues to rise at this rate of change and reaches near the normal water level (I=3.J=-1), the arrow turns yellow to give a warning that the normal water level is exceeded.

If the rate of change remains the same thereafter, a red alarm is displayed (block I=3.J=3).

In this way, even if the rate of change of the parameter is large, if the parameter moves from the dangerous area to the safe area relatively quickly, it can be considered normal.

On the other hand, even if the change is relatively slow, if it is moving from a safe area to a dangerous area, it can be considered as an alarm state.

[Effects of the Invention] As described above, according to the present invention, the dynamic monitoring of parameters is made possible by taking into account the current value in the change rate alarm judgment instead of the conventional judgment based only on the magnitude of the change rate. At the same time, it becomes possible to easily determine whether the actual state of the parameter, that is, the current movement of the parameter, is in a safe direction or in a dangerous direction for the plant.

Furthermore, since the display for the alarm and the actual operating state of the parameters match, the judgment conventionally made by the supervisor becomes unnecessary, and the burden on the supervisor is reduced. In addition, it is possible to prevent incorrect judgment by the monitor due to the mismatch between the alarm '7134''-indication and the actual movement of the parameters, which was a concern in the past. This makes it possible to visually grasp the speed of change, making it possible to perform monitoring in line with reality.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a parameter change rate display determination means according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of a parameter change rate display state according to an embodiment of the present invention, and FIG. 3 is a conventional parameter change Fig. 4 is a configuration diagram of a conventional parameter change rate determining means, and Fig. 51 is a diagram showing the relationship between reactor water level changes during OCA for a B111R reactor vessel. 12...Process manual equipment, 13...Change rate calculation device, 1 position, 15...Alarm level set value, 27, 29...
・Alarm area determination device, 30 ・・A/D converter, 31
...Adder, Fig. 1 f, -vll Fig. 2 Fig. 4 f! 11

Claims (2)

[Claims] (1) In a plant status display device equipped with a display means that displays changes in plant status quantities using symbols, plant status quantities taken in from the plant via a process input device are compared with multiple preset alarm levels. a first alarm range determination device that determines the alarm range and outputs a corresponding first alarm signal; and a rate of change calculation device that calculates the rate of change of the plant state quantity taken in from the plant via the process input device. a second alarm range determination device that compares the rate of change with a plurality of preset alarm levels to determine an alarm range and outputs a corresponding second alarm signal; and an alarm determination device that determines an alarm state according to a composite signal of the two alarm signals, and a symbol mark that displays a change state of the plant state quantity is variably displayed according to the alarm state determined by the alarm determination device. A plant status display device characterized by: (2) The plant status display device according to claim 1, wherein the display color of the symbol mark is changed depending on the alarm state determined by the alarm determination device.