JPH10111395A - Direct current power unit for reactor power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a direct current power unit for a reactor power plant which facilitates securement of direct current supply and adequate setting of capacity, by distinguishing circuits for non-safety system load and safety system load, and for operating time of safety system in a direct current main bus board, and by selecting and breaking non-safety system load and operating time dependent safety load during emergency time of the plant. SOLUTION: A direct current supplying device for a reactor power plant creates a direct current main bus board 9 connected with power supply of storage battery 3 as plural circuits, distinguishing circuits for safety system load circuit which operates in plant emergency time such as all alternating- current power loss accident, external power loss accident, or coolant loss accident, and for non-safety system load circuit which dose not operate in plant emergency time, and breakes a breaker 11 of the non-safety system load circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC power supply for a nuclear power plant, which relates to a DC power supply using a storage battery used in an emergency such as loss of AC power in a nuclear power plant.

[0002]

2. Description of the Related Art The main role of a DC power supply system using a storage battery installed in a nuclear power plant is to maintain the nuclear power plant safely in an emergency such as a loss of all AC power or an external power loss. It is positioned as an emergency power supply for supplying power to the load of equipment related to the safety system.

However, load devices that actually require a DC power supply include not only safety-related loads such as devices that require an emergency operation due to conditions on the equipment side in a plant, but also devices that do not require an operation in an emergency. However, some non-safety-related loads, such as those requiring DC power for driving, are included.
From this, the DC load in the nuclear power plant is divided into a safety system load (abbreviation, class 1E) that requires operation in a plant emergency and a non-safety system load (abbreviation, class NON1E) that does not require operation in a plant emergency. It is roughly divided into two types.

Therefore, when selecting the capacity of a storage battery power supply, which is one of the equipment constituting the DC power supply equipment in a nuclear power plant, as a power source, all the load equipment of the safety-related load and the non-safety-related load must be selected. According to the operation time when each of them is activated, for example, one minute, one hour, eight hours, etc. (substantially continuous treatment) are divided into a plurality, and the required capacity for each operation time is integrated to determine a design value. I have.

[0005]

However, conventionally,
Even in the event of a plant emergency due to the above-mentioned external power loss accident, control (load limitation) for stopping power supply from the storage battery, etc., is performed especially for non-safety-related loads that are devices that do not require operation in the event of a plant emergency. I haven't. Therefore,
As described above, when the state of the plant emergency is resolved early and the normal state is not restored, the supply of DC power to each load depends on the operation status of the plant by the integration time of the design value. It is assumed that the corresponding load is appropriately separated from the storage battery power source according to the judgment of the operator monitoring the load.

[0006] Even for safety-related loads, power supply is not controlled in accordance with the operation time of each load (for example, 1 minute, 1 hour, 8 hours, etc.), so that actual load is not controlled. The required capacity of the storage battery obtained by the integration of the full load capacity is not matched with the total capacity of the loads operating in a plant emergency.

As a result, the equipment capacity of the storage battery power supply in the DC power supply used in the nuclear power plant is selected to be larger than the capacity required for the operation of the safety system load. Accordingly, there has been a problem that, along with the increase in the size of the charger panel, the securing and maintenance of a wide installation place become large-scale.

Further, when the operation of the plant is not identified by the operator in the event of a plant emergency due to the monitoring of the operating condition of the plant, or when the operation of isolating the load is delayed, There has been a problem that the storage battery power supply may be depleted within the design time.

An object of the present invention is to separate a non-safety load from a safety load, a safety load, and a safety load in a DC main bus panel for distributing DC power. It is an object of the present invention to provide a DC power supply for a nuclear power plant, which can easily secure a DC power supply and easily set an appropriate capacity by selectively cutting off a system load and a safety system load according to operation time.

[0010]

According to a first aspect of the present invention, there is provided a DC power supply for a nuclear power plant, wherein a DC main bus connected to a storage battery power supply is constituted by a plurality of circuits, and all AC power is lost. And a non-safety load circuit that operates in the event of a plant emergency such as a power loss accident or a loss of coolant accident, and a non-safety load circuit that does not operate in the event of a plant emergency. It is characterized by blocking. In the event of a plant emergency such as loss of all AC power, the non-safety load circuit that does not operate in the event of a plant emergency is cut off from the storage battery power supply to limit the load.

A DC power supply for a nuclear power plant according to the present invention is characterized in that a non-safety system load circuit in a DC main bus board is cut off by an operator in an emergency. The load restriction of the non-safety system load to the storage battery power supply performed in the event of a plant emergency such as loss of all AC power is performed by the operator confirming and operating the DC power supply device in the plant emergency.

According to a third aspect of the present invention, there is provided a DC power supply for a nuclear power plant, wherein a non-safety-related load circuit in a DC main bus panel is interrupted by a storage battery control device in an emergency. The load control of the non-safety system load on the storage battery power supply that is performed in the event of a plant emergency such as loss of all AC power is automatically performed by the storage battery control device.

According to a fourth aspect of the present invention, in the DC power supply for a nuclear power plant, the storage battery control device includes a total AC power loss signal, an external power loss signal, a coolant loss accident signal accompanied by an external power loss, and a bus voltage drop. The non-safety load circuit is interrupted by a plant emergency signal such as a signal. The storage battery control device in the DC power supply unit confirms the plant emergency and automatically shuts off the non-safety load circuit based on the plant emergency signal for the storage battery power such as the all AC power loss signal and the bus voltage drop signal. Do.

According to a fifth aspect of the present invention, there is provided a DC power supply for a nuclear power plant, wherein the storage battery control device is capable of shutting off a non-safety-related load circuit by a plant emergency signal and an operation of an operator. Features. The storage battery control device in the DC power supply device can shut off the non-safety load circuit by a plant emergency signal such as an all AC power loss signal and an operation by an operator.

According to a sixth aspect of the present invention, there is provided a DC power supply for a nuclear power plant, wherein a DC main bus connected to a storage battery power supply is provided as a plurality of circuits in the DC power supply for a nuclear power plant. A safety system load circuit that operates in the event of a plant emergency such as an accident or loss of all AC power, etc., is divided into a circuit for each load operating time and a non-safety system load circuit that does not operate in the event of a plant emergency. It is characterized in that each of the load circuits is selected and cut off sometimes.

In the event of a plant emergency such as loss of all AC power,
Along with the non-safety load circuit that does not operate in the event of a plant emergency, a plurality of safety system load circuits separated according to the operation time of the safety system load that operates in the event of a plant emergency are selected by terminating the operation of the safety system load according to the operation time. The load is cut off from the battery power supply.

[0017] The DC power supply for a nuclear power plant according to the invention according to claim 7 is characterized in that, in the DC main bus panel, the non-safety-related load circuit and the safety-related load circuit at the time of plant emergency use a circuit for each operation time of each load. The selective cutoff is performed by an operator. The non-safety system load on the storage battery power supply to be carried out in the event of a plant emergency such as loss of all AC power, and the sequential load limitation by the operation time in the safety system load operating in the plant emergency, are performed by the operator in the plant emergency for the DC power supply. Confirmation and operation.

[0018] The DC power supply for a nuclear power plant according to the invention of claim 8 is a DC main bus board, in which a non-safety load circuit and a safety load circuit for an emergency of the plant are provided with a circuit for each operation time of each load. The selective cutoff is performed by the storage battery control device. The non-safety system load and the safety system load for the storage battery power supply to be performed in the event of a plant emergency such as loss of all AC power are automatically limited by the operation time of each load by the storage battery control device automatically.

According to a ninth aspect of the present invention, in the DC power supply unit for a nuclear power plant, the storage battery control unit includes a signal for losing all AC power, a signal for losing external power, a coolant loss accident signal accompanied by a loss of external power, and a bus voltage drop. Shut off the non-safety load circuit using a signal or other emergency signal from the plant, confirm the end of operation of the load classified according to the operation time of the safety load, and select and shut off the circuit for each operation time. It is characterized by.

The storage battery control device in the DC power supply device includes:
Check the end of operation based on all AC power supply loss signals, etc., bus voltage drop signal, and the current value set for the load separated according to operation time, check the time for the storage battery power supply, and automatically check the non-safety load and safety. The system load is sequentially limited by the operation time.

In the DC power supply for a nuclear power plant according to the present invention, the storage battery control unit may cut off the non-safety-related load circuit and operate the safety-related load in response to a plant emergency signal and operation of an operator. The end of the operation of the load classified according to the operation time is confirmed, and the circuit according to the operation time can be selectively cut off. The storage battery control device in the DC power supply device can successively limit loads on the non-safety system load and the safety system load according to operation time by a plant emergency signal such as a total AC power loss signal and the operation of an operator.

A DC power supply for a nuclear power plant according to the invention of claim 11 is characterized in that a DC main bus board incorporates a distribution board for the safety-related load circuit and the non-safety-related load circuit. The DC main bus panel in the DC power supply unit is integrated with a circuit breaker for a safety system load circuit and a non-safety system load circuit, and a distribution board connected to each circuit breaker.

According to a twelfth aspect of the present invention, in the DC power supply for a nuclear power plant, a breaker that can be remotely operated is inserted in each of the plurality of circuits in the DC main bus panel. The DC main bus panel in the DC power supply device is operated by an operator or a storage battery control device by inserting a circuit breaker that can be remotely operated into each of a plurality of provided circuits.

According to a twelfth aspect of the present invention, there is provided a DC power supply for a nuclear power plant, comprising: a DC main bus board including a distribution board; It is a contactor.
In a DC main bus panel having a built-in distribution board, an electromagnetic contactor is used instead of a circuit breaker that can be remotely operated and inserted in each of a plurality of circuits.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. The first embodiment relates to claims 1, 2 and 12, and the DC power supply of the nuclear power plant is an AC power supply for a DC load in the nuclear power plant as shown in the system configuration diagram of FIG. The AC MCC 1 includes an AC undervoltage relay 2 and connects a charger panel 4 to which a storage battery 3 is connected.

The charger panel 4 includes a rectifier 5, an ammeter 7 having a shunt 6, and a battery breaker 8. The rectifier 4 converts the AC from the AC MCC 2 into DC. In addition to the output, the storage battery 3 is charged as needed. When the supply of AC power from the AC MCC 1 is stopped, the storage battery 3 outputs DC power via the shunt 6 as a DC power supply by closing the storage battery circuit breaker 8, and discharges at this time. The current is shunt 6
Is detected by the ammeter 7.

The charger panel 4 is connected to a DC main bus panel 9, and the DC main bus panel 9 is branched into a plurality of circuits, and each circuit has a safety circuit breaker 10a which can be remotely operated.
10c and the non-safety load circuit breaker 11 are interposed. Here, for example, the circuit breaker 10a
10 to 10c are safety-related load circuits, and one circuit of the circuit breaker 11 is separately configured as a non-safety-related load circuit (claim 12).

Further, the distribution boards 12a to 12c for the safety system load and the distribution board 13 for the non-safety system load are connected to the respective circuits of the DC main bus board 9, respectively. The system load distribution boards 12a to 12c are connected to a non-illustrated safety load device, and the non-safety load distribution panel 13 is connected to a large number of non-safety load devices (not shown). (Claim 1).

In addition, for the non-safety load circuit breaker 11 in the non-safety load circuit on the DC main bus board 9, various information relating to the DC power supply and DC load, including a plant emergency in a nuclear power plant, is displayed separately. With reference to the notification by the annunciator 14, the operation can be interrupted by the operation of the operator 15 (claim 2).

Next, the operation of the above configuration will be described. If an emergency such as an external power loss accident occurs during operation of the nuclear power plant, for example, an emergency diesel generator (not shown) is normally automatically started as a plant emergency to secure the bus voltage of the AC MCC1. I do.

However, if the emergency diesel generator causes a start-up traffic jam or the like, a certain period of time (for example,
If the required AC power cannot be secured after 10 seconds or more, or if the external power is not restored in the event of a loss of all AC power, the bus voltage of the AC MCC1 cannot be secured.

At this time, by closing the battery breaker 8 of the charger panel 4, the battery breaker 8 of the safety system load circuit in the DC main bus board 9 from the storage battery 3 via the charger panel 4. Distribution boards 12a-12 for safety system loads from 10a-10c
c, DC power is supplied to the non-safety load distribution board 13 from the non-safety load circuit breaker 11 of the non-safety load circuit. Therefore, the DC power output from the storage battery 3 at this time is supplied to all the safety-related loads that require an operation in the event of a plant emergency and the non-safety loads that do not require an operation in the event of a plant emergency.

However, as one of various information regarding the DC power supply and the DC load in the plant, when the bus voltage of the AC MCC 1 decreases, the AC undervoltage relay 2
Is activated, and the time from the occurrence of the accident is measured by a timer (not shown). For example, if the AC undervoltage relay 2 does not recover after a lapse of a predetermined 10 seconds or more, the information on the decrease of the bus voltage The operator 15 can be informed by being displayed on the annunciator 14 installed in the central control room where the worker 15 is resident.

The operator 15 who has confirmed the information such as the state of the loss of the AC power by the notification of the annunciator 14 judges that the plant is in emergency from the state, and remotely controls the non-safety system load on the DC main bus board 9. The circuit breaker 11 is shut off. This has no effect on the operation of the plant in the event of an emergency, and is operated because it receives DC power as in the normal state. Is cut off, and the load on the storage battery 3 is limited by removing unnecessary DC loads in an emergency of the plant.

Therefore, the effect of this is that the DC power to the non-safety system load supplied from the storage battery 3 is reduced, so that the installed capacity of the storage battery 3 at the time of plant emergency can be reduced. Since the capacity of the battery pack 3 is reduced by reducing the installed capacity of the storage battery 3, the DC power supply device can be downsized by reducing the installation location and maintenance of the storage battery 3 and the charger board 4. Can be.

The second embodiment relates to claim 1, claim 3 to claim 5 and claim 12, wherein the DC power supply of the nuclear power plant has a main configuration as shown in the system configuration diagram of FIG. Since the third embodiment is the same as the first embodiment, a detailed description thereof will be omitted, and different portions will be mainly described.

The DC power supply includes an AC MCC 1 having an AC undervoltage relay 2, a storage battery 3 and a charger panel 4, and a safety circuit breaker 10 which can be remotely operated by a plurality of circuits.
a DC main bus board 9 which is separated into a safety system load circuit interposed through a to 10c and a non-safety system load circuit interposed with a non-safety load circuit breaker 11 which can be remotely operated. (Claim
12).

The safety main load distribution board 12a to 12c and the non-safety load distribution board 13 are connected to each circuit of the DC main bus panel 9, respectively. Panel 12a
12c are connected to a non-safety load distribution panel 13 and a large number of non-safety load devices are connected to the non-safety load distribution panel 13 (claim 1). further,
A logic storage battery control device 16 as shown in the logic circuit diagram of FIG. 3 is provided and configured (claim 3).

As shown in FIG. 3, the storage battery control device 16 outputs a bus voltage drop signal 17 output by the operation of the AC undervoltage relay 2 in the AC MCC 1 and a plant emergency signal from a monitoring unit or the like in the plant. When both the AC power loss signal, the external power loss signal, and the coolant loss accident signal 18 accompanied by the external power loss, which are output at the same time, are inputted together, the non-safety load circuit breaker 11 of the DC main bus panel 9 is cut off. A non-safety system load shedding signal 19 is output (claim 4).

Further, the all AC power loss signal, the external power loss signal, and the coolant loss accident signal accompanied by the external power loss.
18 and non-safety load shedding command signal by operator 15 operation
Even when both of them are input, a non-safety system load shedding signal 19 for shutting off the non-safety system load circuit breaker 11 in the DC main bus board 9 is output (claim 5).

Next, the operation of the above configuration will be described. The operation of the second embodiment is almost the same as that of the first embodiment, except that the non-safety system load is automatically cut off by the storage battery control device 16 in the event of a plant emergency. During the operation of the nuclear power plant, for example, if an external power loss accident occurs and the required AC power cannot be secured even after a certain period of time due to the congestion of the emergency diesel generator, etc., or all AC power is lost If the external power supply is not restored at the time of the accident, the bus voltage of the AC MCC1 cannot be secured.

At this time, by closing the battery breaker 8 of the charger panel 4, the battery breaker 8 of the safety system load circuit in the DC main bus board 9 from the storage battery 3 via the charger panel 4. Distribution boards 12a-12 for safety system loads from 10a-10c
c, DC power is supplied to the non-safety load distribution board 13 from the non-safety load circuit breaker 11 of the non-safety load circuit. Therefore, the DC power output from the storage battery 3 at this time is supplied to all the safety-related loads that require an operation in the event of a plant emergency and the non-safety loads that do not require an operation in the event of a plant emergency.

However, at this time, the AC undervoltage relay 2 in the AC MCC 1 operates and the output bus voltage drop signal 17 is input to the storage battery control device 16. In conjunction with this, when the all AC power loss signal, the external power loss signal and the coolant loss accident signal 18 accompanied by the external power loss are input,
The storage battery control device 16 outputs the non-safety load interrupt signal 19, and the non-safety load interrupter 11 is shut off.

As a result, the non-safety load distribution panel 13 which has no influence on the operation of the plant in an emergency and receives non-safety loads in the same manner as in the normal state and which is operating due to the collection of DC power. Therefore, the load on the storage battery 3 is limited in an emergency of the plant. Therefore, in addition to the same effects as those of the first embodiment, the operator 15
This is automatically performed without the need for
As a result, it is possible to reduce the burden on the operator 15 and improve the reliability.

The operator 15 may, if necessary, input the above-mentioned all AC power loss signal, the external power loss signal, and the coolant loss accident signal 18 accompanied by the external power loss to the storage battery control device 16 if necessary. By issuing the non-safety system load shedding command signal 20, the non-safety system load circuit 11 is cut off by the non-safety load circuit breaker 11, and the load on the storage battery 3 can be limited in the event of a plant emergency.

The third embodiment relates to claim 1, claim 3 to claim 5 and claim 11 and claim 12, wherein the DC power supply of the nuclear power plant has a structure as shown in FIG. In the modification of the second embodiment, the main configuration is the same as that of the first and second embodiments, so that the above detailed description will be omitted, and the differences will be mainly described. The DC power supply includes an AC MCC 1 having an AC undervoltage relay 2, a storage battery 3, a charger panel 4, and a storage battery control device.
16 are provided (claims 1, 3 to 5).

The DC main bus board 21 connected to the charger board 4 includes a safety system load circuit interposed with safety circuit breakers 10a to 10c each of which can be remotely operated by a plurality of circuits. It is separated into a non-safety load circuit interposed with an operable non-safety load circuit breaker 11 (claim 12).

Further, the safety system load circuit breakers 10a to 10c of the safety system load circuit and the non-safe system load circuit breaker 11 of the non-safe system load circuit are respectively connected to the safety system load distribution boards 12a to 12c.
c and the non-safety load distribution board 13 are connected and built in, and are integrated (claim 11).

The operation of the above configuration is the same as that of the second embodiment. In the DC main bus board 21, safety circuit breakers 10a to 10c and non-safety load circuit breakers 11 that can be remotely operated and divided into a plurality of circuits and a large number of load devices (not shown) are connected. Distribution board for system load 12
Since a to 12c and the non-safety load distribution board 13 are integrated, the overall size can be reduced.

The safety-system load circuit breakers 10a to 10c and the non-safety-system load circuit breaker 11 and the safety-system load distribution boards 12a to 12c
Since the installation distance between 12c and the non-safety load distribution board 13 is extremely short, the safety-related load circuit breakers 10a to 10c and the non-safety load circuit breaker 11
Since the connection cables to the power distribution panels 13a to 12c and the non-safety load distribution board 13 are short, each breaking capacity can be reduced, so that the DC main bus panel 21 has the effect of being further miniaturized.

The fourth embodiment relates to claim 1 or claim 2 and claims 11 and 12, and a DC power supply for a nuclear power plant is not shown, but is a modification of the first embodiment. The main configuration of the first embodiment is a direct current (DC) in which the safety-related load distribution panels 12a to 12c and the non-safety-load distribution panel 13 shown in FIG. The main bus board 21 is adopted.
11).

Therefore, the operation and effects of the main system are the same as those of the first embodiment, and the DC main circuit breakers 10a to 10c and the non-safety system load circuit breaker 11 are downsized. Since the bus board 21 can be downsized, the DC main bus board 21 has the effect of being further downsized, as described in the third embodiment.

The fifth embodiment relates to claims 1 to 5, claim 11 and claim 13, and a DC power supply for a nuclear power plant is not shown, but is not shown in the first embodiment or the second embodiment.
In the modification of the embodiment, the main configuration is different from that of the first or second embodiment in that the safety system load distribution boards 12a to 12c shown in FIG. DC main bus panel with integrated safety power distribution panel 13
21 is adopted.

Further, the safety-related load circuit breakers 10a to 10c and the non-safety-system load circuit breaker 11, which can be remotely operated and are inserted in the plurality of circuits separated in the third embodiment,
It is configured so that it is replaced by an electromagnetic contactor that can be operated remotely.

Therefore, the main part of the operation and effect is the same as that of the first embodiment or the second embodiment, and each electromagnetic contactor inserted into a plurality of separated circuits is the same as that of the third embodiment. Circuit breaker 10a for safety system load according to the embodiment
10c and the non-safety load circuit breaker 11, the electromagnetic contactor having a small breaking capacity due to the short connection cable to the safety load distribution boards 12a to 12c and the non-safety load 13 Can be adopted.

In general, by employing an electromagnetic contactor which is smaller than a circuit breaker with the same capacity, the same operation as that of the third embodiment can be obtained, and the DC main bus board 21 can be further downsized. effective.

The sixth embodiment relates to claim 6, claim 7 and claim 12, wherein the DC power supply of the nuclear power plant, as shown in the system configuration diagram of FIG. AC MCC which is an AC power supply
1 is provided with an AC undervoltage relay 2 and is connected to a charger panel 4 to which a storage battery 3 is connected. The charger panel 4 includes a rectifier 5, an ammeter 7 having a shunt 6, and a circuit breaker 8 for a storage battery.
The AC from C1 is converted to DC and output, and the storage battery 3 is charged as needed.

When the supply of AC power from the AC MCC 1 is stopped, the storage battery 3 closes the storage battery circuit breaker 8 to output DC power through the shunt 6 as a DC power supply. The discharge current at the time is detected by the shunt 6 and the ammeter 7. The charger board 4 is connected to a DC main bus board 22. The DC main bus board 22 is branched into a plurality of circuits, and each circuit has circuit breakers 23 to 2 which can be remotely operated.
5 and 11 are inserted (claim 12).

Here, for example, three circuits of circuit breakers 23 to 25 shown in all four circuits are safety system load circuits.
23 is for 1 minute load, circuit breaker 24 is for 1 hour load, and circuit breaker 25 is for 8 hour load (almost continuous treatment). The switchboard 26 is connected to a 1-hour load switchboard 27 and an 8-hour load switchboard 28.

Further, one circuit of the circuit breaker 11 is a non-safety load circuit, which has a configuration in which a non-safety load distribution board 13 is connected. A large number of loads are connected to the distribution board 27, the 8-hour load distribution board 28, and the non-safety load distribution board 13, respectively.

A one-minute load distribution board 26 of a safety system load circuit, a one-hour load distribution board 27 and an eight-hour load distribution board 28, a non-safety load The circuit breaker 11 for the non-safety system load in the circuit is configured to be able to be cut off by the operation of the operator 15 with reference to the notification by the annunciator 14 in which various information regarding the DC power supply and the DC load in the nuclear power plant is separately displayed ( Claim 7).

Next, the operation of the above configuration will be described. If an emergency such as an external power loss accident occurs during operation of the nuclear power plant, for example, an emergency diesel generator (not shown) is normally automatically started as a plant emergency to secure the bus voltage of the AC MCC1. I do.

However, if the emergency diesel generator causes a start-up traffic jam or the like, a certain period of time (for example,
If the necessary AC power cannot be secured after 10 seconds or more, or if the external power is not restored in the event of a loss of all AC power, the bus voltage of the AC MCC1 cannot be secured.

At this time, by closing the battery breaker 8 of the charger panel 4, the battery breaker 8 of the safety system load circuit in the DC main bus board 22 from the storage battery 3 via the charger panel 4 is closed. 23, a one-hour load circuit breaker 24 and an eight-hour load circuit breaker 25, and a non-safety load circuit breaker 11 of a non-safety load circuit, respectively, a one-minute load distribution board 26 and a one-hour load DC power is supplied to the power distribution board 27, the 8-hour load distribution board 28, and the non-safety load distribution board 13.

Therefore, the DC power output from the storage battery 3 at this time is supplied to all safety-related loads that require an operation during a plant emergency and non-safety-related loads that do not require an operation during a plant emergency. .

However, as one of various information regarding the DC power supply and the DC load in the plant, when the bus voltage of the AC MCC 1 decreases, the AC undervoltage relay 2
Is activated, and the time from the occurrence of the accident is measured by a timer (not shown). For example, if the AC undervoltage relay 2 does not recover after a lapse of a predetermined 10 seconds or more, the information on the decrease of the bus voltage The operator 15 can be notified by displaying the information on the annunciator 14 installed in the central control room where the operator 15 is resident.

The operator 15 who has confirmed the information such as the state of the loss of the AC power by the notification of the annunciator 14 determines from the situation that the plant is in an emergency such as the loss of the AC power.
First, the non-safety load circuit breaker 11 of the non-safety load circuit in the DC main bus board 22 is disconnected by remote control.

As a result, there is no effect on the operation of the plant in an emergency, and the non-safety loads for the non-safety loads of the devices which are operating because they are receiving DC power as in the normal case. Since the DC power to the distribution board 13 is cut off, a part of the load on the storage battery 3 is limited so as to eliminate unnecessary DC load in an emergency of the plant.

Next, when the operator 15 confirms from the information of the annunciator 14 that the operation of the load of the safety system load has been completed for one minute, the operator 15 remotely cuts off the load circuit breaker 23 for one minute. After this, 1
After confirming the end of the operation of the time load, the time load circuit breaker 24 of the DC main bus board 22 is disconnected by remote control.

With these operations, the DC power supplied from the storage battery 3 is not only supplied to the non-safety system load, but also the safety system load terminates a predetermined operation in a plant emergency, so that it is not necessary to supply the DC power. Load circuit
Since the DC power can be reduced by separating the storage battery 3 from the storage battery 3 sequentially, the installed capacity of the storage battery 3 in a plant emergency can be reduced.

Since the capacity of the battery pack 3 is reduced by reducing the installed capacity of the storage battery 3, the DC power supply device can be reduced by reducing the installation place and the maintenance of the storage battery 3 and the battery pack 4. Can be miniaturized. The number of classifications of the safety system load circuit and the classification of the safety system load by the operation time such as 1 minute, 1 hour, and 8 hours are not limited to the above examples, and can be arbitrarily selected as needed. .

A seventh embodiment according to the sixth, eighth to tenth and twelfth aspects of the present invention is to automatically and successively limit the load of the storage battery in the event of a plant emergency. As shown in the system configuration diagram of FIG. 6, the main configuration is the same as that of the sixth embodiment, and therefore, different points will be mainly described.

AC MC which is an AC power supply for a DC load
C1 includes an AC undervoltage relay 2 to which the storage battery 3 is connected, and also connects an ammeter 7 including a rectifier 5 and a shunt 6 and a charger panel 4 formed by a battery breaker 8. I have. The charger board 4 is connected to a DC main bus board 22. The DC main bus board 22 is branched into a plurality of circuits, and circuit breakers 23 to 25 and 11 which can be remotely operated are interposed in each circuit. (Claim 12).

Here, three of the four circuits shown are safety-related load circuits, and each load device is operated by operating time (for example, 1 circuit).
Minute, 1 hour, 8 hours) and load breaker for 1 minute
23 and 24 hour circuit breaker 24 and 8 hour circuit breaker 25
In addition, they are connected to a 1 minute load distribution board 26, a 1 hour load distribution board 27, and an 8 hour load distribution board 28, respectively.

One circuit of the non-safety load circuit breaker 11 is a non-safety load circuit, and has a configuration in which the non-safety load distribution board 13 is connected. A large number of loads are connected to the one-hour load distribution board 27, the eight-hour load distribution board 28, and the non-safety load distribution board 13 (claim 6).

Further, a bus voltage drop signal 17 from the AC undervoltage relay 2, a total AC power loss signal, an external power loss signal, and a coolant loss signal 18 due to the loss of the external power from the plant are separately provided. A storage battery control device 29 is provided which receives a storage battery discharge current 30 or the like output from the switch 6 and outputs a shutoff signal for selectively shutting off each breaker of the safety system and non-safety load circuit of the DC main bus board 22. (Claims 8 and 9).

Next, the operation of the above configuration will be described. During the operation of the nuclear power plant, for example, when an emergency such as an external power loss accident occurs, a certain period of time (for example, 10
If the required AC power supply cannot be secured after elapse of more than one second), or if the external power supply is not restored in the event of a total AC power loss, the bus voltage of the AC MCC1 cannot be secured.

At this time, by closing the battery breaker 8 of the charger panel 4, the battery breaker 8 of the safety system load circuit in the DC main bus board 22 via the charger panel 4 from the storage battery 3 for one minute. 23, a one-hour load circuit breaker 24 and an eight-hour load circuit breaker 25, and a non-safety load circuit breaker 11 of a non-safety load circuit, respectively, a one-minute load distribution board 26 and a one-hour load DC power is supplied to the power distribution board 27, the 8-hour load distribution board 28, and the non-safety load distribution board 13.

Therefore, the DC power output from the storage battery 3 at this time is supplied to all the safety-related loads that are required to operate during a plant emergency and the non-safety-related loads that are not required to operate during a plant emergency. .

The storage battery control device in the event of an emergency in this plant
In FIG. 29, as shown in the logic circuit diagram of FIG. 7, when the bus voltage of the AC MCC 1 drops, the bus voltage drop signal 17 by the AC undervoltage relay 2, the all AC power loss signal, the external power loss signal, and the external power loss If the AC undervoltage relay 2 is not restored even after a predetermined 10 seconds or more have elapsed, the non-safety system load shedding signal 19 is output to output the DC main bus. The non-safety load circuit breaker 11 of the non-safety load circuit in the panel 22 is cut off.

In this way, the non-safety system in which the non-safety system loads of the devices operating because they have no influence on the operation of the plant during the emergency of the plant and receive the DC power as in the normal state are collected. Since there is no DC power supply to the load distribution board 13, unnecessary DC loads are removed in an emergency of the plant, and the first-stage load limitation on the storage battery 3 is performed.

Next, the DC current supplied from the storage battery 3 to the safety system load is detected as the storage battery discharge current signal 30 by the shunt 6 of the charger panel 4 and input to the storage battery control device 29. This storage battery discharge current signal 30 to 1
The change of the discharge current with respect to the minute load is checked by the set value 30a of the current value by the load capacity calculation of the separately set one minute load and the one minute timer (TPU), and the operation of the one minute load in the emergency of the plant, Confirm the end of the operation.

In addition to the signal for confirming the end of operation of the one-minute load in the storage battery discharge current signal 30, the bus voltage drop signal 17
Then, when the condition by simultaneous input of the all AC power loss signal, the external power loss signal, and the coolant loss signal 18 accompanying the loss of the external power is satisfied, the 1 minute load shedding signal 31 is output.

The one-minute load cut-off signal 31 shuts off the one-minute load circuit breaker 23 of the safety system load circuit in the DC main bus board 22. Storage battery 3 for the load device whose operation has been completed
Then, the power supply from the power supply is stopped, and the non-safety load circuit is stopped by the non-safety load circuit breaker 11 being shut off, and then the second-stage load limitation on the storage battery 3 is performed.

Further, in the storage battery control device 29, similarly to the case of the one-minute load interruption, the change in the discharge current with respect to the one-hour load from the storage battery discharge current signal 30 is determined by calculating the separately set load capacity of the one-hour load. Check the value set value 30b and the one-hour timer (TPU) to confirm the end of the one-hour load operation.

A condition is established by the simultaneous input of the all AC power loss signal, the external power loss signal and the coolant loss signal 18 due to the external power loss, together with the one-hour load operation end confirmation signal in the battery discharge current signal 30. Then, a one-hour load shedding signal 32 is output from the storage battery control device 29. As a result, when the one-hour load circuit breaker 24 is shut off, the load of the one-hour load in the safety system load is limited as the third stage to the storage battery 3 following the one-minute load.

The operator 15 separately confirms the plant emergency and sends a non-safety system load shedding command signal to the storage battery controller 22.
By issuing the signal 20, the non-safety system load shedding signal is output when the all AC power loss signal, the external power loss signal, and the coolant loss accident signal 18 accompanied by the external power loss are input.
19 is output. When the non-safety load circuit breaker 11 is cut off by the non-safety load cutoff signal 19, supply of DC power to the non-safety load is stopped, and the load is limited for the storage battery 3 in a plant emergency. Can be.

Next, the operator 15 confirms the operation time of the safety system load in the event of a plant emergency and the termination of the operation of the load by the load current or the like separately using, for example, the ammeter 7 and the like. By issuing the command signal 33,
When the all AC power loss signal, the external power loss signal, and the coolant loss accident signal 18 accompanied by the external power loss are input, a one minute load shedding signal 31 and a one hour load shedding signal 32 are output.

As a result, the one-minute load circuit breaker 23 and the one-hour load circuit breaker 24 are cut off, so that the one-minute load distribution board 26 and the one-hour load distribution board in the safety system load circuit are disconnected. 27, the load on the storage battery 3 in the event of a plant emergency can be limited (claim 10).

Therefore, in the seventh embodiment, the same effects as those of the sixth embodiment can be obtained, and also regarding the load limitation on the storage battery 3 in the event of a plant emergency, the end of the operation of the load equipment is confirmed for each operation time. Since the operations are automatically and sequentially performed without any trouble to the plant, the burden on the operator is reduced and the reliability is improved.

Further, since the DC power supplied from the storage battery 3 can be effectively reduced, the installed capacity of the storage battery 3 corresponding to a plant emergency can be reduced. Further, as the capacity of the storage battery 3 is reduced, the capacity of the charger panel 4 is reduced.
In addition, the size of the DC power supply device can be reduced as well as the installation space and maintenance of the DC power supply can be reduced.

The eighth embodiment relates to claim 6, claim 8 to claim 10 and claim 11 and claim 12, wherein the DC power supply of the nuclear power plant is as shown in the system configuration diagram of FIG. In the modification of the seventh embodiment, the main configuration is the same as that of the seventh embodiment, and thus the above detailed description is omitted, and different parts will be mainly described.

The DC power supply device is provided with an AC MCC 1 having an AC undervoltage relay 2, a storage battery 3 and a charger panel 4, and a DC main bus panel 34 connected to the charger panel 4 is branched into a plurality of circuits. Each circuit is provided with circuit breakers 23 to 25, 11 which can be remotely operated (Claim 12).

Here, three of the four circuits are safety-related load circuits, and each load device is operated according to the operation time (for example, 1 circuit).
Minute, 1 hour, 8 hours) and load breaker for 1 minute
23 and 24 hour circuit breaker 24 and 8 hour circuit breaker 25
Furthermore, one circuit of the non-safety load circuit breaker 11 is a non-safety load circuit (claim 6).

A large number of loads are connected to the one-minute load circuit breaker 23, the one-hour load circuit breaker 24, the eight-hour load circuit breaker 25, and the non-safety system load circuit breaker 11, respectively. 1 minute load distribution board 26 and 1 hour load distribution board 27
In addition, the distribution board 28 for the 8-hour load and the distribution board 13 for the non-safety system are connected to each other and integrated into a built-in unit (claim 11).

Further, a bus voltage drop signal 17 from the AC undervoltage relay 2, a total AC power loss signal, an external power loss signal, and a coolant loss signal 18 due to the loss of the external power from the plant are separately provided. The battery discharge current 30 output from the unit 6 and the non-safety system load shedding command signal 20 and the safety system load shedding command signal 33 issued by the operator are input.
A storage battery control device 29 for outputting a cutoff signal for selectively cutting off each of the circuit breakers of the safety main load circuit and the non-safety load circuit of the DC main bus board 34 is provided (claims 8, 9, 10).

The operation of the above configuration is the same as that of the seventh embodiment, so that the same effect can be obtained. In the DC main bus board 34, the one-minute load circuit breaker 23 and the one-hour load circuit breaker 24, and the eight-hour load circuit breaker 25 of the safety-related load circuit that can be remotely operated and divided into a plurality of circuits, Further, the non-safety load circuit breaker 11 of the non-safety load circuit, the one-minute load distribution board 26 for the safety-related load connecting a number of load devices (not shown), and the one-hour load distribution board
Since the 27 and 8-hour load distribution board 28 and the non-safety load distribution board 13 for the non-safety load are integrated, the overall size can be reduced.

The one-minute load circuit breaker 23, the one-hour load circuit breaker 24, the eight-hour load circuit breaker 25, the non-safety system load circuit breaker 11, and the one-minute load distribution boards 26 and 1 The distribution distance between the distribution board 27 for the time load and the distribution board 28 for the 8-hour load and the distribution board 13 for the non-safety load is short, and the short connection cable is a factor. Therefore, there is an effect that the DC main bus board 34 can be further downsized.

The ninth embodiment relates to claims 6 and 7, and claims 11 and 12, wherein the DC power supply of the nuclear power plant is not shown, but is a modification of the sixth embodiment. The main configuration of the sixth embodiment is a configuration in which the DC main bus panel 34 incorporating each distribution board integrated with each of the circuit breakers shown in the eighth embodiment in the sixth embodiment (claim 11). .

Therefore, the main parts of the operation and effects are the same as those of the sixth embodiment, and the one-minute load circuit breaker 23 and the one-hour load circuit breakers 24 and 8 of the safety system load circuit are provided.
The downsized circuit breaker 25 for the time load and the non-safety load circuit breaker 11 of the non-safety load circuit and the downsized DC main bus board 34 have the same operation and effect as the sixth embodiment, and There is an effect that can be downsized.

The tenth embodiment relates to claims 6 and 7 and claims 11 and 13, and a DC power supply for a nuclear power plant is not shown in the drawings.
In the modification of the embodiment, the main configuration is the same as that of the sixth or seventh embodiment, but employs the DC main busbar 34 shown in the eighth embodiment.

Further, a one-minute load circuit breaker 23 which can be remotely operated and is inserted into a plurality of circuits separated in the eighth embodiment, a one-hour load circuit breaker 24 and an eight-hour load circuit breaker 25 Further, the non-safety load circuit breaker 11 of the non-safety load circuit is replaced with an electromagnetic contactor that can be remotely operated (claim 13).

Therefore, the main part of the operation and effect is the same as that of the sixth embodiment or the seventh embodiment, and each electromagnetic contactor inserted in a plurality of separated circuits is the same as that of the eighth embodiment. Connection cables for the one-minute load distribution board 26, the one-hour load distribution board 27 and the eight-hour load distribution board 28, and the non-safety load non-safety load distribution board 13 of the embodiment. Is short, it is possible to use an electromagnetic contactor having a small breaking capacity.

In general, by using an electromagnetic contactor which is smaller than a circuit breaker with the same capacity, the same operation as that of the eighth embodiment can be obtained, and the DC main bus board 34 can be further miniaturized. effective.

[0105]

As described above, according to the present invention, in a nuclear power plant, a DC power supply device using a storage battery as an emergency power source for safely maintaining the plant in an emergency such as a loss of all AC power or an external power loss accident, A non-safety load that does not need to operate in the plant emergency or a safety load that operates in the plant emergency and whose operation has been terminated are sequentially selected and cut off from the DC power supply to limit the load.

Thus, the storage capacity of the DC power supply, which is an emergency power supply, is optimally set to reduce the equipment capacity, thereby reducing the size of the DC power supply, reducing the burden of operation and maintenance, and reducing plant load emergency. The reliability of safety maintenance in is improved.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a DC power supply device according to a first embodiment of the present invention.

FIG. 2 is a system configuration diagram of a DC power supply device according to a second embodiment of the present invention.

FIG. 3 is a logic circuit diagram of a storage battery control device according to a second embodiment of the present invention.

FIG. 4 is a system configuration diagram of a DC power supply device according to a third embodiment of the present invention.

FIG. 5 is a system configuration diagram of a DC power supply device according to a sixth embodiment of the present invention.

FIG. 6 is a system configuration diagram of a DC power supply device according to a seventh embodiment of the present invention.

FIG. 7 is a logic circuit diagram of a storage battery control device according to a seventh embodiment of the present invention.

FIG. 8 is a system configuration diagram of a DC power supply device according to an eighth embodiment of the present invention.

[Explanation of symbols]

1: AC MCC, 2: Undervoltage relay, 3: Storage battery, 4
... Charger board, 5 ... Rectifier, 6 ... Shunt, 7 ... Ammeter, 8
... breakers for storage batteries, 9, 21, 22, 34 ... DC main bus panel, 10
a to 10c: Circuit breaker for safety system load, 11: Circuit breaker for non-safety system load, 12a to 12c: Distribution board for safety system load, 13: Power distribution board for non-safety system load, 14: Annunciator, 15 ... Operator, 16,
29: storage battery control unit, 17: bus voltage drop signal, 18: total AC power loss signal, external power loss signal, coolant loss accident signal accompanied by external power loss, 19: non-safety system load shedding signal,
20 ... Non-safety system load shedding command signal, 23 ... 1 minute load circuit breaker, 24 ... 1 hour load circuit breaker, 25 ... 8 hour load circuit breaker, 26 ... 1 minute load distribution board, 27 ... 1 Distribution board for time load, 28: Distribution board for 8 hour load, 30: Battery discharge current signal, 30a: Set value of current value by load capacity calculation for 1 minute load, 30b: By calculation of load capacity for 1 hour load Set value of current value, 31 ... 1 minute load shedding signal, 32 ... 1 hour load shedding signal, 33 ... Safety system load shedding command signal.

Continuation of front page (72) Inventor Daijiro Ikeda 1-24-30 Minamieki, Nakamura-ku, Nagoya-shi, Aichi Pref. Toshiba Central Office

Claims (13)

[Claims] 1. A DC power supply device for a nuclear power plant, wherein a DC main bus connected to a storage battery power supply is used as a plurality of circuits to operate in a plant emergency such as a loss of all AC power, a loss of external power, and a loss of coolant. A DC power supply device for a nuclear power plant, wherein the DC power supply device is formed separately into a system load circuit and a non-safety load circuit that does not operate in a plant emergency, and shuts off the non-safety load circuit in a plant emergency. 2. The direct-current power supply for a nuclear power plant according to claim 1, wherein the non-safety-related load circuit in a plant emergency is cut off by an operator in the direct-current main bus panel. 3. The direct-current power supply for a nuclear power plant according to claim 1, wherein the non-safety-related load circuit of the direct-current main bus panel is shut off by a storage battery control device. 4. The non-safety load circuit according to claim 1, wherein the storage battery control device uses a non-safety load signal such as a total AC power loss signal, an external power loss signal, a coolant loss accident signal accompanied by the external power loss, and a bus voltage drop signal. 4. The DC power supply for a nuclear power plant according to claim 3, wherein the DC power supply is shut off. 5. The DC power supply for a nuclear power plant according to claim 4, wherein said storage battery control device enables the non-safety-related load circuit to be shut off by a plant emergency signal and an operation of an operator. apparatus. 6. A DC power supply device in a nuclear power plant, wherein a DC main bus connected to a storage battery power supply is used as a plurality of circuits to operate in a plant emergency such as a loss of external power supply, a loss of coolant, or a loss of all AC power. In the system load circuit, the circuit is divided into a circuit according to the operation time of each load and a non-safety load circuit that does not operate in a plant emergency, and each of the load circuits is selectively cut off in a plant emergency. DC power supply for nuclear power plants. 7. The DC main bus panel is characterized in that, in a non-safety load circuit and a safety load circuit in the event of a plant emergency, an operator selectively operates and shuts off a circuit for each operation time of each load. A DC power supply for a nuclear power plant according to claim 6. 8. The storage battery control device in the DC main bus panel, wherein the non-safety load circuit and the safety load circuit in the event of a plant emergency selectively cut off the circuits for each operation time of each load. Item 7. A DC power supply for a nuclear power plant according to Item 6. 9. The non-safety load circuit according to claim 1, wherein the storage battery control device is configured to perform a non-safety load circuit by a plant emergency signal such as a total AC power loss signal, an external power loss signal, a coolant loss accident signal accompanied by the external power loss, and a bus voltage drop signal. While blocking the
9. The DC power supply for a nuclear power plant according to claim 8, wherein the operation termination of the load classified according to the operation time of the safety system load is confirmed, and the operation time-dependent circuit is selected and cut off. 10. The storage battery control device confirms interruption of a non-safety-related load circuit by a plant emergency signal and operation of an operator, and confirms termination of operation of the safety-related load classified according to operating time in a safety-related load. 10. The DC power supply for a nuclear power plant according to claim 9, wherein said operation time-dependent circuit can be selectively cut off. 11. The DC power source for a nuclear power plant according to claim 1, wherein the DC main bus panel includes a distribution board for the safety-related load circuit and the non-safety-related load circuit. apparatus. 12. The DC power supply for a nuclear power plant according to claim 1, wherein a breaker that can be remotely operated is interposed in each of the plurality of circuits in the DC main bus panel. . 13. The DC main bus board incorporating the distribution board, wherein a breaker which can be remotely operated and inserted into each of the plurality of circuits is an electromagnetic contactor. Item 13. A DC power supply for a nuclear power plant according to item 12.