JPH0225157B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a control rod operation assist device for a nuclear power plant, and in particular, the control rod operation assistant has a function of presenting an appropriate amount of control rod operation to an operator, and monitoring the operator's operation and the state of the reactor core after the operation. Regarding equipment. In general, power control methods for boiling water reactors include a method of controlling the amount of control rods inserted into the reactor core and a method of controlling the flow rate of coolant within the reactor core. The method of controlling the coolant flow rate mainly attempts to control the reactor output by controlling the amount of voids generated in the reactor core, and is particularly used during power operation when a large amount of voids are generated. , there is a limit to the amount of output fluctuation that can be controlled by the coolant flow rate. On the other hand, the method of controlling the amount of control rod insertion attempts to directly control the amount of nuclear fission in the fuel by withdrawing and inserting control rods installed adjacent to almost all fuel assemblies that make up the reactor core. The amount of output fluctuation that can be controlled is large, and it can be used from startup to 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 However, in general, when a control rod is withdrawn, the reactor output fluctuates significantly, and in particular, the local output increase of the fuel pin adjacent to the operating control rod is large. Extreme care must be taken to prevent fuel damage due to sudden increases in output, and during power operation to prevent fuel damage due to sudden increases in output and localized increases in output. As described above, since the control rod operation requires careful attention, it has not been done automatically in the past, and all operations have been performed by an operator. However, in general, in boiling water reactors, a scram using an intermediate range monitor (IRM range) is carefully set in order to prevent a sudden increase in output due to control rod withdrawal, and especially during restart, output changes due to Zenon fluctuations. , operator error may lead to a scram. Additionally, during power operation, a local rod block monitor (RBM) is installed to prevent fuel damage.
Although a device is provided to prevent the control rod from being pulled out by the operator, there is a risk of fuel damage due to incorrect control rod operation. The present invention was made in response to such conventional circumstances, and includes a plant/core data sampling device that inputs plant/core data from a nuclear power plant, and a plant/core data sampling device that inputs plant/core data from the plant/core data sampling device. death,
The current plant core state is determined by inputting a prediction device that predicts and calculates changes in plant and core data after control rod operation, inputting plant and core data from the plant and core data sampling device, and inputting control rod operation signals output by the operator. Check whether the plant core state is in a state that allows control rod operation, and if the current state of the plant core is in a state that allows control rod operation, the prediction device is used to determine whether the plant core state after control rod operation is in a state that allows control rod operation. The control rod checks whether the control rod is in a permissive state, and outputs the operating procedure of the control rod to the output device when it is in a permissible state, and outputs the reason to the output device when it is not in a permissible state. An object of the present invention is to provide a control rod operation assisting device characterized by being equipped with an operation condition confirmation device. 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 assistance device shown in Fig. 1 includes an input device 1, a plant/core data sampling device 2,
It is composed of a control rod operation condition confirmation device 3, a prediction device 4, a control rod operation confirmation device 5, a core state confirmation device 6, and an output 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 is
From the nuclear power plant 8, for example, plant/core data listed as data that can be directly measured in a table to be described later is periodically sampled. The control rod operation condition confirmation device 3 is activated by inputting the start of control rod operation to the input device 1, and checks the current control rod pattern inputted from the plant/core data sampling device 2 and the control rod operation inputted in advance. Determine the control rod to be operated based on the sequence. Then, this control rod operating condition confirmation device 3 confirms whether the plant state and the reactor core state are in a state that allows control rod operation based on the plant and core data input from the plant and core data sampling device 2, and If the condition is permissible, use the prediction device 4 described below to calculate 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. If the current core condition does not allow control rod operation, or if the predicted core condition 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,
If the predicted core state after the control rod operation satisfies the restrictions, the control rod operation procedure is output to the output device 7. Note that the plant state and reactor core state confirmed by the control rod operating condition confirmation device 3 differ depending on the operating mode of the reactor, as shown in the following table as an example. As shown in the table, these conditions are divided into those that can be directly measured and those that must be calculated from measured values.

[Table] The prediction device 4 inputs the current plant/core state from the plant/core data sampling device 2, and in response to the request from the control rod operation condition confirmation device 3, takes into account the Alternatively, for example, the items shown in the table mentioned above may be predictively calculated after a certain period of time has elapsed. The control rod operation confirmation device 5 inputs plant/core data from the plant/core data sampling device 2 and confirms the control rod operation by the operator. That is, this control rod operation confirmation device 5 is automatically started by starting the control rod operation condition confirmation device 3, inputs plant/core data before control rod operation from the plant/core data sampling device 2, and also inputs plant/core data before control rod operation from the plant/core data sampling device 2. In response to the control rod operation signal, the plant/core data after the control rod operation is input from the plant/core data sampling device 2, and for example, from changes in the control rod position signal, nuclear instrumentation signal, etc., it is determined that the control rods are operating as instructed. , outputs to the output device 7 whether or not the operation has been performed. The core state confirmation device 6 inputs plant/core data from the plant/core data sampling device 2, checks in a short time whether the core state after control rod operation satisfies the constraint conditions, and outputs the information to the output device 7. Output. That is, this core state confirmation device 6 is automatically activated by activation of the control rod operation confirmation device 5,
The current state of the core is estimated based on plant and 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 includes, for example, a color display device, and includes a control rod operation condition confirmation device 3, a control rod operation confirmation device 5, and a core state confirmation device 6.
Display the output from . In the control rod assist device configured as above,
When the operator inputs the start of control rod operation into the input device 1, the control rod operation condition confirmation device 3 confirms whether the plant state and the reactor core state are in a state that allows control rod operation, and also confirms whether or not the plant state and the reactor core state are in a state that allows control rod operation. When this is the case, it is checked whether the plant state and reactor state changes are permissible when the control rods are operated by the planned amount, and if they are not permissible, this is output to the output device 7 along with the reason. Therefore, the operator's operation becomes very easy. In other words, if the control rod operation condition confirmation device 3 outputs to the output device 7 that control rod operation is not allowed, 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, when 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, since the control rod operating condition confirmation device 3 uses the prediction device 4 to perform predictions by taking Zenon fluctuations into consideration, the transition of the Zenon state in the core state is In addition, by outputting information such as the intermediate range monitor range switching timing to the output device 7 when operating the control rods, it is possible to appropriately guide the operator. Further, since the control rod operation confirmation device 5 outputs to the output device 7 whether or not the control rod has been operated as instructed, the operator will not be mistaken as to which control rod to operate. Furthermore, the core status confirmation device 6 outputs information on whether the core status after control rod operation satisfies the constraint conditions to the output device 7 in a short time. Measures can be taken. As described above, according to the control rod operation assisting device of the present invention, the operation control rod position and operation amount are presented to the operator, and the operator can operate the control rod according to the instructions. Operator erroneous operations can be greatly reduced. Therefore, according to the present invention, the burden on the operator can be greatly reduced, and the possibility of erroneous operations by the operator can be greatly reduced.

[Brief explanation of drawings]

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, 3... Control rod operating condition confirmation device, 4
...Prediction device, 5...Control rod operation confirmation device, 6...Core state confirmation device, 7...Output device, 8...Nuclear power plant.

Claims (1)

[Claims] 1 A plant/core data sampling device that inputs plant/core data from the nuclear power plant, and a plant/core data sampling device that inputs plant/core data from this device to predict and calculate changes in plant/core data after control rod operations. By inputting plant/core data from the prediction device and the plant/core data sampling device, and inputting control rod operation signals output by the operator, it is confirmed whether the current plant core condition is in a state that allows control rod operation. , when the current plant core state is in a state that allows control rod operation, the prediction device is used to confirm whether the plant core state after the control rod operation is in a state that allows control rod operation, and a control rod operating condition confirmation device that outputs a control rod operating procedure to an output device when the control rod is in a permissible state, and outputs the reason to the output device when the control rod is not in a permissible state; Rod operation assist device.