JPS5848890A - Control rod operation assisting 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 The present invention relates to a control rod operation assisting system (H) for a nuclear power plant, in particular, it presents an appropriate control rod 1e operation to the operator, and also monitors the operator's operation and the state of the reactor core after the operation. 7-) regarding control rod operation assistant bag with monitoring function.

In general, power control systems for boiling water reactors include a method of controlling insertion loss of control rods in the reactor core and a method of controlling the flow rate of coolant in the reactor core.

The method of controlling the coolant flow rate mainly attempts to control the reactor output by controlling the void meters generated in the reactor core, and is especially used when the void generator is operating at a large output. However, there is a limit to the amount of output fluctuation that can be controlled by the coolant flow rate.

On the other hand, there is a method for controlling the control rod insertion surface in which the control rods are installed adjacent to almost all the fuel assemblies that make up the reactor core in pairs.
The nuclear fission of the fuel is directly controlled by pulling out and inserting the rotor control 41 at 4).The amount of controllable output fluctuation is large, and it can be used from the time of startup to the time of output operation.

Therefore, this method is widely used during startup, restart, control rod pattern adjustment, load following operation, reactor shutdown, etc.

However, in general, when a control rod is withdrawn, the reactor output fluctuates greatly, and in particular, the local output increase of the adjacent fuel bin is large due to the operating control rod, so during start-up and restart, the output due to control rod withdrawal is Fuel damage due to sudden increase in output, and sudden increase in output and local output increase during power operation
Extreme care is required to prevent fuel damage caused by CX.

As described above, control rod operations require careful attention, and conventionally these operations have not been performed automatically, but have been entirely controlled by an operator.

In general, boiling water reactors are equipped with an intermediate region monitor (I
BM range) scram is set in detail, and especially at restart, there is a change in output due to Zeno fluctuation, so there is a risk of operator error resulting in scram.

In addition, during power operation, 1.
Local Rondo Block Monitor (RB M)K is equipped with a device to prevent the control rod from being withdrawn; however, if the operator operates the control rod incorrectly, there is a risk of fuel damage.

The present invention has been made in response to such conventional circumstances, and includes a plant/core data sampling device for inputting plant/core data 4 from a nuclear power plant, and a plant/core data sampling device for inputting plant/core data 4 from a nuclear power plant.
A prediction device that inputs reactor core data and predicts and calculates changes in plant and core data after control rod operation; and a prediction device that inputs plant and core data from the plant and core data sampling device and inputs control rod operation signals output by the operator. Eli uses the above prediction device to check whether the current and post-control rod operation state of the plant core is in a state that allows control rod operation, and if it is in a state that allows control rod operation,
Provided is a control rod auxiliary device comprising a control rod operation condition confirmation device that outputs control rod operation procedures to an output device and, when the control rod is in an acceptable state, outputs the reason to the output device. This is what I am trying to do.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of the present invention will be described with reference to an embodiment shown in the drawings.

The control rod operation assisting device shown in FIG. It consists of a device 7.

That is, the input device 1 receives an input from the operator to start control rod operation.

The plant/core data sampling device 2 periodically samples, from the nuclear power plant 8, plant/core data that is listed as directly measurable in, for example, a table to be described later.

The control rod operation condition confirmation device 6 is activated by an input to the input device 1 to start control rod operation, and checks the current control rod pattern input from the plant/core data sampling device 2 and the control rod operation sequence input in advance. Based on this, determine the control rod to be operated.

Then, this control rod operation condition confirmation device 3 confirms whether the plant state and core state are conditions that allow control rod operation based on the plant and core data input from the plant and core data sampling device 2, and When the condition is permissible, use the prediction device 4 described below to calculate the changes in the plant state and core state when the control rods are operated by the planned amount, and check whether the changes are permissible. do. - Then, when the current core state does not permit control rod operation, or when the predicted core state after control rod operation does not satisfy the restrictions, the reason is output to the output device 7.

Conversely, if the current core condition allows control rod operation and the predicted core condition after control rod operation satisfies the restrictions, the control rod operation procedure is output to the output device 7.

The plant status and core status that are confirmed by the control rod operating condition confirmation device 5 vary depending on the operating mode of the reactor, as shown in the following table.

As shown in the table, these conditions are divided into those that can be directly measured and those that require calculation of measured values.

The table prediction device 4 is a plant/core data sampling device @
2, input the current plant/core state, and in response to the request from the control rod operation condition confirmation device 6, take into account Zeno fluctuations, and display the information after the control rod operation or after a certain period of time has elapsed, for example, in the table mentioned above. Predictively subtract matters.

The control rod operation confirmation device 5 inputs plant/core data from the plant/core data summing device 2 and confirms the operator's control rod operation.

In other words, this control rod operation confirmation device FI￥5 is automatically activated when the control rod edge (M confirmation device 6σ) is activated, and converts the blunt/core data before control rod operation into the plant/core data. At the same time, plant/core data after control rod operation is inputted from the sampling device 2 in response to the operator's control rod operation signal, such as control rod position signals, nuclear instrumentation signals, etc. Based on the change in , it is output to the output device 7 whether or not the control rod has been operated as instructed.

Core status confirmation device 6v'! ,, Input the plant/core data from the plant/core data sampling device 2 (-
It is checked in a short time whether the core state after the control rod operation satisfies the constraint conditions, and the result is output to the output device 7.

That is, this core state confirmation device 6 is automatically activated when the control rod operation confirmation device 5 is activated, and estimates the current core state based on plant/core data changed by control rod operations.

The contents to be estimated are the items in the table mentioned above that require calculation.

The output device 7 is composed of, for example, a color display device, and displays the outputs from the control rod operation condition confirmation device 3, the control rod operation confirmation device 5, and the core state confirmation device 6.

In the control rod auxiliary device configured as described above, when the operator inputs the start of control rod operation into the input device 1, the control rod operation condition confirmation device 6 checks whether the plant state and the core state are suitable for control rod operation. Check whether the conditions are permissible, and if the conditions are permissible, check whether the changes in the plant state and core state when the control rods are operated by the planned amount are permissible. If not, the reason is outputted to the output device 7 together with the reason, so that the operator's operation becomes very easy.

In other words, when the control rod operation condition confirmation device 6 outputs to the output device 7 that control rod operation is not permitted, the operator should follow the reason displayed on the output device 7 to bring the reactor core to a state where control rod operation is possible. Able to operate a furnace.

Conversely, if the control rod operation condition confirmation device 3 outputs to the output device 7 that control rod operation is permitted, the operator can operate the control rod according to the instructions displayed on the output device 7.

In particular, this control rod assisting device uses the prediction device 4 to perform predictions taking Zenon fluctuations into consideration, so at times when the Zenon concentration changes significantly, the Zenon state of the reactor core is In addition to the transition, it is also possible to appropriately guide the operator by outputting information such as the timing for switching the intermediate range monitor range to the output device 7 when operating the control rod.

Yes, the control rod operation confirmation device @5 outputs information to the output device 7 as to whether or not the control rods were operated as instructed.
The operator cannot make a mistake in controlling the control rod 'f;/.

Furthermore, if the core status confirmation device 6 shows that the core status of the control rod control rods satisfies the constraint conditions, it is outputted to the output device 7 in a short time. , suddenly take measures against this.

As described above, according to the control rod operation assisting device of the present invention, the operation control rod position (N and operation i) are not presented to the operator, and the operator can operate the control rod according to these instructions. Therefore, it is possible to reduce the number of operator errors to 1].

Furthermore, since the f1 operator's operation status is always checked, if the operator makes a mistake in operating the control rod, the operator should be able to quickly find out about this mistake.

Therefore, the VCJ of the present invention: It is possible to greatly reduce the burden on the operator, and it is also possible to greatly reduce the possibility of erroneous operations by the operator.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the control rod assisting device of the present invention.-1...Input device 2...Plant/core data sampling device...
・Control rod operation condition confirmation device 4...Prediction device 5...Profile 1 rod operation confirmation device 6...Core condition confirmation device 7...Output device 8...Atomic power light "Cheng Frant agent, patent attorney 111 Sa -

Claims (1)

[Claims] A plant/core data sampling device that inputs plant core data from a nuclear power plant, and a prediction system that inputs plant/core data from this plant/core data sampling device and predicts and calculates changes in plant/core data after control rod operations. By inputting plant/core data from the plant/core data sampling device and the control rod operation signal output by the operator, the prediction device is used to predict the current and post-control rod operation status of the plant core. A control system that checks whether the permissible state is in place, and outputs the control rod operating procedure to the output device when the permissible state is in the permissible state, and outputs the reason to the output device when the permissible state is not in the permissible state. A control rod auxiliary device comprising a rod operation condition confirmation device.