JP2012230069A - Auxiliary power supply of nuclear installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an auxiliary power supply of a nuclear installation which can secure an independent power source stably for a long time.SOLUTION: An auxiliary power supply of a nuclear installation comprises a storage battery 18 to use as a power source of equipment 19, 19a. Further, the auxiliary power supply comprises: an additional pipe arrangement 13 provided for a cooling water discharge-channel which cooling discharge water drained from a nuclear power plant is flowed through; a water wheel 15 provided in the pipe arrangement to be rotated and driven by the cooling discharge water; and a generator 16 driven by the water wheel 15. With the generated output of the generator 16, the storage battery 18 is charged.

Description

  The present invention relates to an auxiliary power supply apparatus for a nuclear facility, and more particularly to an auxiliary power supply apparatus for a nuclear facility that can be secured for a long time even when an external power source is lost.

  The power source for in-house power of the nuclear power plant facility has a plurality of transmission lines connected to the power system as external power sources, and also has a plurality of diesel generators as emergency in-house power sources. If all of these AC power sources are lost, the reactor is automatically shut down, and the decay heat and residual heat after the reactor shutdown must be removed by natural circulation of coolant and water supply to the steam generator. Therefore, power is supplied from the storage battery to the DC load required for these, and the cooling operation is monitored after the reactor is shut down.

  The storage battery can secure the cooling of the reactor for about 2 hours after the reactor is shut down until the AC power is restored. The storage battery is not safe until the external power supply is restored when all AC power is lost, in addition to the safety system load, emergency control oil pump for protecting the bearings of turbines and generators, emergency lighting, etc. Make the system load function.

  As a power generation system that does not rely on an external power source or fossil fuel, a method of hydroelectric power generation using discharged water from a power plant has been proposed. That is, when the cooling water used in the condenser is discharged into seawater, a method of using the discharged cooling effluent as a water source for power generation is known (for example, Patent Document 1 and Patent Document 2). reference).

JP 2002-115642 A JP 2008-223749 A

  Here, when the external power source is lost, the emergency diesel generator can be activated to secure a power source. However, the emergency diesel generator may fail to be activated. In this case, since the conventional storage battery can be used as a power source only for about 2 hours, it is difficult to secure a stable power source for a long time.

  An object of the present invention is to provide an auxiliary power supply apparatus for a nuclear facility that can stably secure an independent power supply for a long time.

(1) In order to achieve the above object, the present invention provides an auxiliary power supply device for a nuclear facility having a storage battery used as a power source for equipment, in a cooling water discharge channel through which cooling discharge water discharged from the nuclear power plant flows. A separate pipe provided for the pipe, a water turbine that is rotationally driven by the cooling discharge water, and a generator that is driven by the water turbine, and the electric power generated by the generator is stored in the storage battery. It is intended to be charged.
With this configuration, an independent power source can be secured stably for a long time.

  (2) In the above (1), preferably, another pipe provided in the cooling water discharge channel has a cross-sectional area different from that of the cooling water discharge channel, and has a smaller cross-sectional area than the cooling water discharge channel.

  (3) In the above (1), preferably, the storage battery is kept warm by thermal energy generated in the power plant.

  (4) In the above (1), preferably, the storage battery is cooled by a part of the cooling water used in the power plant.

  According to the present invention, an independent power source can be secured stably for a long time.

1 is a configuration diagram of a power generation system of a nuclear power plant to which an auxiliary power supply device for a nuclear facility according to an embodiment of the present invention is applied. It is a block diagram of the auxiliary power unit of the nuclear facility by one Embodiment of this invention. It is a block diagram of the movable weir used for the auxiliary power unit of the nuclear facility by one Embodiment of this invention. It is a block diagram of the hydraulic line used for the auxiliary power unit of the nuclear facility by other embodiment of this invention.

Hereinafter, the configuration and operation of an auxiliary power supply apparatus for a nuclear facility according to an embodiment of the present invention will be described with reference to FIGS.
First, the configuration of a power generation system of a nuclear power plant to which the nuclear power plant auxiliary power supply device according to the present embodiment is applied will be described with reference to FIG.
FIG. 1 is a configuration diagram of a power generation system of a nuclear power plant to which an auxiliary power supply device for a nuclear power facility according to an embodiment of the present invention is applied.

  In the reactor vessel 25 of the nuclear power plant, thermal energy is generated by the fission reaction, and the heated water is supplied to the steam generator 26 by the pump 33 to generate steam. The generated steam is supplied to the turbine 28 through the pipe 27. The turbine 28 is rotated by the supplied steam and rotates the generator 29 to generate power. The steam after driving the turbine 28 is cooled and condensed by the condenser 30, returned to water, and circulated by the pump 32 to the steam generator 26.

  The condenser 30 uses a lot of cooling water, and seawater is often used for the cooling water, and therefore the power plant is relatively installed in the coastal area. Seawater is pumped up by the pump 31 and the temperature of the cooling water used in the condenser 30 rises several degrees (warm drainage), and is discharged again into the seawater as cooling discharge water 50. Here, an example of a pressurized water reactor of a nuclear power plant has been shown, but a power reactor such as a light water reactor such as a boiling water reactor or an improved boiling water reactor or a heavy water reactor may be used.

Next, the configuration of the auxiliary power unit for the nuclear facility according to the present embodiment will be described with reference to FIGS. 2 and 3.
FIG. 2 is a configuration diagram of an auxiliary power supply apparatus for a nuclear facility according to an embodiment of the present invention. FIG. 3 is a configuration diagram of a movable weir used in the auxiliary power supply apparatus for a nuclear facility according to an embodiment of the present invention.

  As shown in FIG. 2, in the present embodiment, a hydroelectric power generation system 100 is used as a power source for the storage battery 18 to constitute an auxiliary power supply device for a nuclear facility. The hydroelectric power generation system 100 includes a hydroelectric power generation unit 15 a including a turbine 15 and a generator 16, and a DC power supply unit 17 a including a charger 17 and a storage battery 18. Note that FIG. 2 does not show auxiliary machines.

  First, the configuration and operation during normal operation will be described. Cooled effluent water 50 discharged from the nuclear power plant (FIG. 1) is temporarily stored in the reservoir 11, passes through the hydraulic line 12, and is discharged from the spillway 24 to the sea. A branch pipe 13 communicating with the water pressure pipe 12 is provided in a part of the water pressure pipe 12, and a certain amount of cooling discharge water can be guided to the branch pipe 13. The cross-sectional area of the branch pipe 13 is smaller than the cross-sectional area of the hydraulic pipe line 12. Cooled effluent water in the branch pipe 13 is increased in speed by a throttle portion 14 provided in the branch pipe 13, rotates a water turbine 15, and drives a hydroelectric generator 16 connected to a rotating shaft of the water turbine to generate power. And discharged from the discharge channel 24 to the sea. The electric power generated by the hydroelectric generator 16 is charged into the storage battery 18 via a rectifier (not shown) and a charger 17. Charging the storage battery 18 is performed in a timely manner, and power generation may not be performed when the battery 18 is sufficiently charged. In the building 21 including the storage battery 18, when the temperature is low in winter, a part of the cooling water heated by the condenser 30 (FIG. 1) is drawn by the pump 20 to keep the storage battery 18 warm. Thereby, the performance of the storage battery can be maintained even in winter when the temperature is low. When the temperature is high, such as in summer, by drawing in the cooling water before it is warmed, the temperature rise around the storage battery is prevented and the deterioration of the storage battery due to the high temperature is reduced. Power can be saved by using natural energy.

  Next, a case will be described where the emergency diesel generator does not start when the external power supply is lost, which is an emergency, and all the external AC power supply is lost. In such a case, only the DC power source by the storage battery 18 is used, and the safety device 19 and the non-safety device 19a must be functioned to maintain the reactor cooling, so that the DC power source can be maintained for a long time. There is a need. When the amount of drainage is reduced due to some problem such as stopping of the cooling water pump 31 (FIG. 1), the position of the movable weir 22 provided in the hydraulic line 12 is changed as necessary. Pipe line 12 is fully closed.

  As shown in FIG. 3, a fixed amount of cooled and discharged water 50 is guided into the branch pipe 13 by the movable weir 22 a.

  Since it is possible to stably generate hydroelectric power and generate electric power even in an emergency, an emergency lighting (not shown), a hydrogen control valve (not shown), etc., which are safety load 19 connected to the storage battery, A measurement control device (not shown), an emergency circulating oil pump (not shown), etc., which are non-safety loads 19a, can be operated for a long time, and the safety of the nuclear power plant can be maintained.

  Examples of the turbine 15 include a Pelton turbine, a Francis turbine, a Kaplan turbine, and the like.

  Next, the configuration and operation of an auxiliary power supply apparatus for a nuclear facility according to another embodiment of the present invention will be described with reference to FIG. The configuration of the power generation system of the nuclear power plant to which the auxiliary power supply apparatus for the nuclear facility according to the present embodiment is applied is the same as that shown in FIG. The basic configuration of the auxiliary power supply for a nuclear facility according to this embodiment is the same as that shown in FIG.

  FIG. 4 is a configuration diagram of a hydraulic pipe line used in an auxiliary power supply device of a nuclear facility according to another embodiment of the present invention. The same reference numerals as those in FIG. 2 denote the same parts.

  In this example, another flow path 51 is arranged in the hydraulic pipe line 12. A throttle part 53 is arranged inside the flow path 51, and a housing 52 including a water turbine and a generator is installed upstream of the throttle part 53. When the cooling water discharge flow rate decreases, the flow rate flowing into the hydraulic pipe line 12 is limited by a movable weir (not shown) as in the first embodiment, and a fixed amount of cooling discharge water is supplied to the flow channel 51. Try to guide. When the double pipe configuration is used in this way, water turbine power generation is possible without increasing the installation area of another pipe or the like.

  These hydroelectric power generation units and DC power supply units are installed in buildings that can withstand even large earthquakes and tsunamis, and underground buildings that prevent submersion, and function even in the event of a loss of all AC power. . Moreover, although the water wheel was installed in the water pressure pipe, it is not limited to this and may be installed in a place where it can be installed in the water discharge channel.

  As described above, according to each embodiment of the present invention, it is possible to have a rechargeable battery that can be charged by a system independent of an external AC power source or a diesel generator, and even in an emergency, a movable battery arranged in a hydraulic line. Since the amount of water led to the water wheel by the weir can be made constant, power can be generated stably for a long time, and the performance of the storage battery can be maintained by keeping the storage battery warm and cooled. Power can be supplied to the load.

  In other words, by simply reusing cooling effluent discharged from a nuclear power plant as a water source for power generation in the event of an emergency, operation can be performed in the event of loss of all AC power sources such as loss of external power or failure to start up emergency power. Even when the storage battery is exhausted, the storage battery can be charged by hydroelectric power generation from the cooled discharge water.

  In addition, by branching a part of the cooling discharge channel, it is possible to maintain a constant discharge water flow even when the discharge water is reduced, so that hydropower can be stably generated even in an emergency, The safety of nuclear power plants can be increased.

  In addition, by guiding a part of the thermal energy generated from the power plant to the storage location of the storage battery, the storage location can be kept warm, and the temperature of the storage battery can be maintained at 0 ° C. or higher even in winter. Can be maintained.

DESCRIPTION OF SYMBOLS 11 ... Reservoir 12 ... Water pressure line 13 ... Branch pipe 14 ... Throttling part 15 ... Water wheel 15a ... Hydroelectric power generation part 16 ... Generator 17 ... Charger 17a ... DC power supply part 18 ... Storage battery 19 ... Safety system load 19a ... Non-safety system Load 20 ... Pump 21 ... Buildings 22 and 22a ... Movable weir 24 ... Discharge channel 25 ... Reactor pressure vessel 26 ... Steam generator 27 ... Steam 28 ... Turbine 29 ... Generator 30 ... Condenser 31 ... Cooling water supply pump 32 ... secondary cooling water circulation pump 33 ... primary cooling water circulation pump 50 ... cooling discharge water 51 ... flow path 52 ... housing 53 ... throttle part

Claims (4)

An auxiliary power unit for a nuclear facility having a storage battery used as a power source for equipment,
A separate pipe provided for the cooling water discharge channel through which the cooling discharge water discharged from the nuclear power plant flows;
A water wheel provided in the separate pipe and driven to rotate by the cooling discharge water;
A generator driven by the water wheel,
An auxiliary power supply apparatus for a nuclear facility, wherein the storage battery is charged with electric power generated by the generator. The auxiliary power supply for a nuclear facility according to claim 1,
The auxiliary power supply apparatus for a nuclear facility, wherein the separate pipe provided in the cooling water discharge channel has a cross-sectional area different from that of the cooling water discharge channel, and has a smaller cross-sectional area than the cooling water discharge channel. The auxiliary power supply for a nuclear facility according to claim 1,
An auxiliary power supply apparatus for a nuclear facility, wherein the storage battery is kept warm by thermal energy generated in the power plant. The auxiliary power supply for a nuclear facility according to claim 1,
An auxiliary power supply apparatus for a nuclear facility, wherein the storage battery is cooled by a part of cooling water used in the power plant.

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