JPH022403A - Plant state display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a plant status display device that displays the operating status of a plant such as a nuclear power plant, and particularly relates to a plant status display device that displays the operating status of a plant such as a nuclear power plant. The present invention relates to a plant status display device improved to display the remaining time until lock is established (automatic startup, etc.).

(Prior Art) Generally, nuclear power plants and chemical plants are provided with various interlocks to protect various systems and devices.

In addition, in these plants, when a problem such as an abnormality occurs in various systems or equipment, an interlock is established based on preset conditions to automatically start this system, and the problem is resolved centrally. Alarms are displayed on plant status display devices such as supervisory control panels.

For example, in a nuclear power plant, if some kind of trouble occurs with the water pump that supplies water to the reactor, an alarm will be issued by the plant status display device such as the central control panel, depending on the trouble, without indicating the abnormal location or abnormal condition. and display.

Additionally, in order to prevent damage to the plant, an interlock for automatically stopping the equipment is built into the plant.

Furthermore, since the water level in the reactor will only continue to drop if the feedwater pumps mentioned above are automatically stopped, an interlock is installed in the plant to automatically start a replacement (backup) pump for the automatically stopped feedwater pump to supply water to the reactor. It is incorporated.

Furthermore, in the unlikely event that the above alternative pumps do not start and the reactor water level drops, the emergency core cooling system (ECC8: Emer-geflCvCo)
Multiple re-cooling systems have been installed and are designed to automatically start up temporarily in response to a drop in the reactor water level.

Nuclear power plants are thus equipped with a wide variety of interlocks in multiple layers to ensure safe operation of the plant and system.

(Problem to be solved by the invention) However, in such conventional plants, when the interlock is established and the required system is activated,
A warning will be displayed on the plant status display device to indicate the start of the system, but for interlocks that are established after the timer set time has elapsed, it is important for operators to accurately know the operating status, especially the remaining time until the interlock is established. The problem is that it is difficult to do so.

That is, in order to establish the interlock shown in FIG.
It is necessary that the logic signal, C signal, and time delay signal from the circuit 1 are simultaneously input to the second AND circuit 2, and a timer (
(not shown) must be timed out by allowing a set time to elapse when outputting the AND logic signal of the A and B signals and the C signal.

The purpose of installing this timer is to allow the operator to intervene within the set time of the timer even after the conditions for outputting the A, B, and C signals are met, and to allow the operator to reset the timer to lock the interlock. This is to prevent the establishment of the system and provide room for delaying the start of automatic operation of the required system.

However, resetting this timer only initializes its timekeeping operation, so the A and B signals
As long as the ND logic signal and the C signal are supplied to the second AND circuit 2, the counting operation of the timer continues.

Furthermore, the timer must be reset within the set time.

Figure 2 shows a flowchart until the interlock shown in Figure 1 is established. Counting (timekeeping) of the set time starts.

At this time, a plant status display device such as a central monitoring control panel receives the A, B, and C signals, displays an alarm on the corresponding alarm, and causes the indicator to wave.

Therefore, the operator visually checks the displays on these alarms and indicators to comprehensively judge the operating state of the plant and determines whether or not to reset the timer. If you do not reset the timer, an interlock will be established and the required system will start, but if you reset the timer before the timer set time expires, the timer will be initialized and start counting the set time again from zero. .

However, in conventional plant status display devices, there is no timer display to measure the set time of the timer, that is, to display the remaining time until the set time expires. It is necessary to measure time or to reset the timer while always being aware of the time, which is one of the causes of human error in driving operations.

Therefore, the present invention has been made in consideration of the above circumstances, and its purpose is to provide a plant status display device that can display the remaining time until the expiration of the timer setting time and can reduce human errors in resetting the timer. It is about providing.

(Structure of the Invention) (Means for Solving the Problems) The present invention provides a plant status display device that displays the operating status of a plant that establishes an interlock that is established as the set time of a timer elapses. It is characterized by the provision of a timer display that displays the remaining time until the set time expires.

(Function) When the timer incorporated in the interlock is activated when the activation condition is satisfied, the timer display of the plant status display device displays the remaining time from the activation to the expiration of the set time.

Therefore, the operator can check the remaining time on the timer on the timer display and then decide whether or not to reset the timer, thereby significantly reducing human errors in resetting the timer. This makes it possible to improve the safety of plant operation.

(actual pus case) An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a flowchart showing the configuration of main parts of an embodiment of the present invention. In the figure, P1 to P6 indicate each step of the flowchart, and numeral 11 indicates an interlock of a required system of a plant such as a nuclear power plant. This is a timer display that displays the remaining time from the start of the built-in timer until the set time expires.

That is, this embodiment is characterized in that a timer display 11 is provided at the interlock of a plant such as a nuclear power plant, and the timer display 11 is installed at each required interlock in which a timer is installed.

The timer display 11 has a remaining time calculator 11a as shown in FIG. 1, which starts in conjunction with the start of a timer built into a required interlock, and calculates the set time from the start of the timer. The remaining time until expiration is increased by 11, and this remaining time is alerted by the alarm 11b and continuously displayed by the remaining time display 11C.

Therefore, as shown in FIG. 1, when the activation condition for the timer incorporated in the required system interlock is satisfied at Pl, the timer is activated at P2 and starts counting the set time.

At this time, in conjunction with the activation of the timer, the remaining time calculation unit 11a of the timer display 11 is activated at P3, and calculates the remaining time from the activation of the timer to the expiration of the set time as time passes, and calculates the remaining time as time passes. The results are given to the alarm device 11b and the remaining time display device 11c, and the remaining time is alerted and displayed at P4.

Therefore, the operator checked the remaining time on the timer and
The timer reset operation can be performed calmly and calmly, and human errors in this reset operation can be reduced.

When the timer is reset at P5, the timer is initialized and starts counting the set time again from zero.
When the expiration of the set time is counted, the interlock is established at P6, and the system incorporating this interlock is automatically started or stopped.

Therefore, according to this embodiment, the timer setting operation can be performed while checking the remaining time until the expiration of the timer setting time, that is, the establishment of the interlock, on the remaining time display 11c. It is possible to reduce the number of mistakes made, and it is possible to improve the safe operation of plants such as nuclear power plants.

〔Effect of the invention〕

As explained above, the present invention uses a timer display item to display the remaining time until the set time of the timer incorporated in the interlock of the required system is displayed. Since it is possible to determine whether or not to reset the timer while checking the display, it is possible to do so, thereby reducing human errors in resetting the timer and improving the safety of plant operation. can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a flowchart showing the main structure of the Iζ1 embodiment of the plant status display device according to the present invention, Fig. 2 is an interlock diagram of a general interlock incorporating a timer, and Fig. 3 is an interlock diagram of a conventional interlock. 5 is a flowchart of a part of the status display device. 11...Timer indicator, 11a...Remaining time estimator, 11b...Alarm, 11C...Remaining time indicator.

Claims (1)

[Claims] A plant status display device for displaying the operating status of a plant having an interlock that is established as the set time of a timer elapses, characterized by being provided with a timer display that displays the remaining time from activation of the timer to expiration of the set time. Plant status display device.