JPH0480691A - Apparatus for controlling nuclear reactor - Google Patents

Abstract

PURPOSE:To automatically prevent the operation of a control rod due to the operation mistake by an operator by automatically checking inputted control rod operation order data. CONSTITUTION:A reactor pressure 1 receives a cooling material 2 and a core 3 and a plurality of control rods 4 are inserted and pulled out by a control rod driving apparatus 5 and the positions of the control rods 4 are detected by a detector 6. A core operation administrator preliminarily inputs control rod operation order data to a control rod pull-out monitor apparatus 7 through an operation part 9 and, in the apparatus 7, an operator 11 operates the control rod worth at the time of the operation of the control rods (the reactivity applied quantity at the time of the pulling- out of the control rods) on the basis of neutron diffusion calculation to judge whether said value can be permitted by a judging part 12 and, when the value can not be permitted, a message is printed by a printer 13. The core administrator corrects the inputted operation order and the apparatus 7 stores an accurate operation order in a memory 10. When an operator operates the control rods through a control rod operation panel 8, a control rod pull-out permission judging part 14 judges whether operation is correct from the data in the memory 10 and the control rod position data from the detector 6 and can stop the operation command to the driving apparatus 5 in the case of erroneous operation.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a nuclear reactor that monitors and controls the insertion and withdrawal of a plurality of control rods inserted into a fuel assembly in a nuclear reactor. The present invention relates to a control device, and particularly to one that reliably prevents erroneous operations due to mistakes in creating control pull-out order data.

(Prior Art) A nuclear reactor, for example, a boiling water reactor (hereinafter referred to as BWR) has the following configuration. That is, a reactor pressure vessel is installed within the reactor containment vessel, and the reactor pressure vessel contains a coolant and a reactor core. This core is composed of a plurality of fuel assemblies, control rods, etc. The coolant flows upward through the core and is heated by the heat of nuclear reaction in the core, resulting in a two-phase flow state of water and steam. The steam is separated in a steam separator and then dried in a steam dryer to become dry steam, which is transferred to a turbine system via a main steam pipe connected to the reactor pressure vessel and used for power generation.

The control rods are inserted between the fuel assemblies, and each is connected to a control rod drive mechanism, which is driven by a hydraulic drive to control the insertion and withdrawal of the control rods into the reactor core. do. This controls the core power. Further, the hydraulic drive device is operated by operating a control rod drive circuit by operating a switch by an operator. Each control rod is inserted into and removed from the fuel assembly at several tens of positions in the axial direction. As the control rod is inserted into the fuel assembly, the neutron flux decreases, and as the control rod is withdrawn, the neutron flux increases.

Each control rod is inserted into and removed from each fuel assembly to reduce the neutron flux so that it is not locally concentrated, thereby maintaining the reactor in a safe state. Therefore, if the control rods are driven in the wrong order when starting and stopping a nuclear reactor, neutrons may be locally concentrated and the stability of the reactor may be impaired. Therefore, the operator must select and drive control rods in the correct order, of which there are over 100 control rods, each of which has dozens of positions for insertion and removal. However, it is very difficult to constantly drive such a large number of control rods in a fixed operation order, and there is a risk of erroneous operation.

Therefore, in recent years, the control rod value minimizer system (hereinafter referred to as RWM) has been developed.
system) was developed. This RWM system is a device as described above, which is equipped with a central processing unit such as an electronic computer, and this processing unit stores the selection order and insertion/removal positions of control rods. If the operator operates the switch incorrectly in the selection order and insertion/removal position, the command signal supplied from the control rod drive circuit to the hydraulic drive device is blocked by the switch operation with a block signal generated from the central processing unit. This prevents operator error from being transmitted to the control rod drive. Furthermore, in the new RWM system, the central processing unit can instruct the operator via the display device about control information to be set in the control rod drive device.

By the way, the control rod operation order information, such as the control rod selection order and withdrawal position, which is stored in the processing device, is input in advance by a core management engineer.

However, the above configuration has the following problems. That is, the control rod operation order information stored in the processing device is created by a core management engineer;
Operators operate control rods in accordance with instructions from core management engineers.

If the core management engineer made a mistake, there was a risk that the control rods would be operated incorrectly.

(Problem to be Solved by the Invention) In this conventional configuration, if the core management engineer who decides the order of control rod operations makes a mistake, there is a problem that the control rods will be operated incorrectly. The present invention has been made based on these points, and its purpose is to have a function to automatically check the input control rod operation order information, and to prevent stable operation due to erroneous judgments and inputs. An object of the present invention is to provide a nuclear reactor control device that can effectively solve the problem of impaired operation of a nuclear reactor.

[Structure of the Invention] (Means for Solving the Problems) That is, a nuclear reactor control device according to the present invention includes a reactor core having a plurality of control rods inserted into a plurality of fuel assemblies, and controls the control rods. In a nuclear reactor control device that controls a nuclear reactor that is driven by a rod drive device to insert and remove control rods into the reactor core, there is a control rod position detection unit that detects the position of the control rod, and a control rod position detection unit that detects the position of the control rod, and a control rod position detection unit that detects the position of the control rod. A control rod operating section that is operated to manipulate the position, an operating section that inputs operation order information of the control rods, and a control rod operation that is performed based on the control rod operation order information that is input through this operating section. a control rod value calculation unit that calculates the control rod value at the time by executing a neutron diffusion calculation; a control rod operation order information determination unit that determines whether the control rod value calculated by the control rod value calculation unit is acceptable; a control rod operation order information storage unit that stores input control rod operation order information; the control rod operation order information stored in the control rod operation order information storage unit; and position detection information from the control rod position detection unit. Control that determines whether the operator's operation is correct or incorrect based on the operator's operation information from the control rod operating unit and stops outputting the operation information to the control rod drive device if the operator's operation is incorrect. The present invention is characterized by comprising a rod withdrawal permission determination section.

(Function) In the reactor control device configured in this way, when control rod operation order information is input through the operation unit and the control rods are operated based on the input control rod operation order information. The value of the control rod (the amount of reactivity applied when the control rod is hollowed out) is calculated by performing neutron diffusion calculations, and it is determined whether it is acceptable. If the control rod value is unacceptable,
Since the message is printed, the core manager corrects the input control rod operation order information. In this way, the correct control rod operation sequence is reliably determined and stored.

For example, when the operator operates the control rod through the control rod operation section, the control rod withdrawal permission determination section determines the control rod withdrawal permission based on the information stored in the control rod operation order information storage section and the information detected by the control rod position detection section. Determine whether it is right or wrong,
If it is incorrect, the output of the operation command to the control rod drive device is stopped.

(Example) An example of the present invention will be described below with reference to FIG. FIG. 1 is a diagram showing an outline of a BWR and the configuration of a reactor control device according to this embodiment, and reference numeral 1 in the figure is a reactor pressure vessel. This reactor pressure vessel 1 contains a coolant 2 and a reactor core 3.
The reactor core 3 is composed of a plurality of fuel assemblies (not shown) and control rods 4. Each of the control rods 4 is a control rod drive device! 5, and are inserted into and withdrawn from the reactor core 3 by this control rod drive device 5.

The control rod 4 is made of boron or carbide used as a neutron absorbing material, and is inserted between the fuel assemblies to reduce the neutron flux and the amount of heat generated.

Conversely, by being withdrawn, the neutron flux is increased and the amount of heat generated is increased. In addition, in the rated output state, normally 0 to 10 or more control rods 4 are inserted, so in order to transition from the fully inserted state of all control rods in the cold shutdown state to the rated output state, most of the control rods 4 must be inserted. It is necessary to draw them out according to a predetermined order. On the other hand, the position of each control rod 4 is detected by a control rod position detecting device 6, and the reference numeral 7 in the figure
Reference numeral 8 indicates a control rod withdrawal monitoring device, and reference numeral 8 indicates a control rod operation panel. This control rod operation panel 8 is used when the operator operates the control rods. The control rod withdrawal monitoring device 7 receives the control rod position information detected by the control rod position detection device 6, the control rod withdrawal order information input and stored in advance, and the operator via the control rod operation panel 8. The control rod operation instruction information is compared with the control rod operation instruction information instructed by the operator to determine whether or not the operator is operating the control rods in accordance with a preset procedure.

The control rod withdrawal order information is input in advance by the core operation manager, and the input is performed using the control rod withdrawal monitoring operation unit 9 of the control rod withdrawal monitoring device W7. The control rod operation order is input as shown in Table 1 below, for example.

(Leaving space below) Table 1 For one control rod (for example, one with coordinates (30-31)), input the extraction position in 1.22...64 steps, and then input this input to other control rods. The control rod is pressed firmly. When increasing the output by sequentially withdrawing the control rods from a cold shutdown state in which all control rods are fully inserted, the control rods 4 are withdrawn from the reactor core 3 as evenly as possible. This prevents the reactivity from locally concentrating, and also reduces the control rod value (the amount of reactivity applied when the control rod 4 is pulled out), in the event that the control rod 4 comes off and leaves the reactor core 3. Even in the event of an accident in which the fuel falls off, efforts are being made to minimize the amount of radioactive material released due to damage to the fuel.

The input control rod operation order information is temporarily stored in the control rod operation order information storage section 10. Control rod value calculation section 1
1 calculates the control rod value for each step when the control rod is operated according to the control rod operation order information stored in the control rod operation order information storage unit 10. This calculation is performed using a built-in three-dimensional simulator that performs neutron diffusion calculations or a two-dimensional model that enables control rod value calculations. The control rod operation order information judgment section is a control rod value calculation section 12.
Determine whether the control rod value calculated in is smaller than the predetermined allowable control rod value. The judgment result and the control rod value for each step are output to the printing unit 13 together with control rod operation order information. The core operation manager looks at the results output to the printing unit 13, and if the control rod value is an unacceptable value, the core operation manager displays control rod operation order information based on the calculated control rod value for each step. is corrected from the operation unit 9. In this way, the control rod operation order in which the control rod value is less than or equal to the allowable value is reliably determined and stored in the control rod operation order information storage section 10.

Control rod operation order information storage unit 1 obtained as described above
Using the control rod withdrawal order stored as 0, the control rod withdrawal permission determination unit 14 determines the operator's control rod operation instruction in the following procedure. The control rod withdrawal permission determination unit 14 sequentially takes in data from the control rod position detection unit 6 and stores information on insertion/removal positions of the control rods 4 in the reactor core 3 . Then, using the control rod withdrawal order information imported from the control rod operation order information storage unit 10, the current control rod pattern and the control information (control rod position and insertion/removal position) to be operated next by the operator are used to operate the control rods. It is displayed on the guide display section 15. When the operator issues a control rod operation instruction using the control rod operation panel 8, the operation instruction is compared with the above control information to check whether it is correct or incorrect. If the operator's operation instruction is correct, the operation instruction is sent to the control rod drive device 5 to insert or remove the control rod 4. Conversely, if the operation instruction is incorrect, the instruction is sent to the control rod drive device 5. to prevent Furthermore, the determination result is displayed on the operator panel 16 together with information on the insertion/removal position of the control rod 4.

According to this embodiment, the following effects can be achieved.

In other words, even if a core management engineer who decides the control rod operation order makes a mistake, the input control rod operation order information is automatically checked.

Misjudgments and incorrect inputs by core management engineers are eliminated, and the correct order of control rod operations is ensured.

Further, if the operator's operation instruction is incorrect, the output of the operation instruction to the control rod drive device 5 is automatically blocked, so the integrity of the reactor is reliably maintained.

Note that the present invention is not limited to the one embodiment described above, and various configurations are possible.

First, it is conceivable to separate the control rod value calculating section 11 in the above embodiment into another computer. Calculation of control rod value requires a three-dimensional simulator, and is relatively simple.
A large-capacity computer may be required, and it may be more efficient to separate it from other components. In this case, the control rod value calculation unit 11 and other components are connected via a line, control rod operation order information is transferred, and the control rod value calculation results are returned to the control rod operation order information determination unit 12. The rest of the configuration is the same as in the previous embodiment.

Furthermore, if the control rod operation order information judgment unit 12 in the above embodiment is incorporated with a control rod operation order optimum robot program of another person, and has a function of suggesting a method for correcting an incorrect control rod operation order to the correct order, Become efficient.

Furthermore, in the embodiment described above, the number of control rods that can be pulled out at the same time is one, but the invention is not limited to this, and it can also be applied to a case where a plurality of control rods can be pulled out at the same time. The present invention can be applied to other nuclear reactors with similar configurations.

〔Effect of the invention〕

As described in detail above, according to the nuclear reactor control device according to the present invention, erroneous judgments and erroneous inputs by core management engineers regarding the order of control rod operations are reliably eliminated, and control rod operations due to operator errors are automatically prevented. Therefore, the integrity of the reactor can be reliably maintained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a control rod withdrawal monitoring device showing an embodiment of the present invention. 1... Reactor pressure vessel, 2... Coolant, 3... Reactor core,
4... Control rod, 5... Control rod drive device, 6
...Control rod position detection section, 7.Control rod withdrawal monitoring device, 8.Control rod operation panel, 9.Control rod withdrawal monitoring device operation section, 10.Control rod operation order information storage section, 11...Control rod value calculation section. 12... Control rod operation order information judgment unit, 14... Control rod withdrawal permission judgment unit.

Claims (1)

[Scope of Claims] (1) A reactor core is provided with a plurality of control rods inserted into a plurality of fuel assemblies, and the control rods are driven by a control rod drive device to insert and remove the control rods into the reactor core. In a nuclear reactor control device that controls a nuclear reactor, the control rod position detecting section detects the position of the control rod, the control rod operating section is operated by an operator to manipulate the insertion/removal position of the control rod, and the control rod position detecting section detects the position of the control rod. An operating section for inputting rod operation order information and a control rod value calculated by performing neutron diffusion calculations when control rods are operated based on the control rod operating order information input through this operating section. a control rod value calculation unit that determines whether the control rod value calculated by the control rod value calculation unit is acceptable; a control rod operation order information determination unit that stores input control rod operation order information; An information storage section, control rod operation order information stored in the control rod operation order information storage section, position detection information from the control rod position detection section, and operator operation information from the control rod operation section. and a control rod withdrawal permission determination unit that determines whether the operation by the operator is correct and stops outputting the operation information to the control rod drive device if the operation by the operator is incorrect. Furnace control device. (2) The control rod value calculation unit is separated into another computer and connected through a line to transfer control rod operation order information and execute control rod value calculation.
The reactor control device described. (3) The nuclear reactor control system according to claim 1, wherein the control rod operation order information determining unit is provided with a function of suggesting a method for correcting an incorrect control rod operation order to the correct order.