JP5197114B2 - Fast reactor - Google Patents

Description

  The present invention relates to a fast reactor in which a liquid metal coolant is driven by an electromagnetic pump.

  Conventionally, a fast reactor using a liquid metal as a coolant is designed to give a driving force to the coolant using an electromagnetic pump or a mechanical pump. Compared with mechanical pumps, the electromagnetic pump can linearly adjust the coolant flow rate, the flow path can be configured as a complete seal, small size, high flexibility in installation position, no moving parts, excellent maintenance management, discharge It has the advantage of high output.

  However, assuming that the power loss of the pump should occur, the mechanical pump whose rotor and other rotating parts move for a while will drive the coolant to some extent even after the power is lost, but the electromagnetic pump will continue to move after the power loss. Because it does not have, it does not drive the coolant. Therefore, in a fast reactor that uses an electromagnetic pump as a driving source for coolant, when the power supply to the electromagnetic pump is lost, the coolant is driven only by fluid inertia and convection. Therefore, in order to control the coolant flow rate reduction characteristics after power loss of the electromagnetic pump (hereinafter simply referred to as flow rate reduction characteristics), an emergency power supply for the electromagnetic pump is installed. To drive.

  In the event of a loss of power to the electromagnetic pump, the fast reactor will be shut down urgently by a control rod scram. The core has an effective multiplication factor of 1 or less due to the scram of the control rod, and the output decreases exponentially. In this case, the flow rate reduction characteristic is ideally a characteristic that keeps the output / flow rate ratio constant. If the flow rate decrease is too slow with respect to the power decrease, it is considered that thermal transient stress is generated in the structure near the core outlet. This is because the temperature difference between the vicinity of the inlet and the outlet of the core during normal operation reaches about 150 degrees, so that the coolant near the core inlet is not heated in the core when the coolant flow rate is large even after the core is stopped urgently. This is to reach the exit. Further, if the flow rate is decreased too quickly, the coolant flow rate is reduced with respect to the power of the core, and it is assumed that the coolant becomes too hot while passing through the core.

For the above reasons, as a device for obtaining a desired coolant flow rate reduction characteristic, a device that reduces the desired flow rate by controlling the power supplied from the emergency power supply to the electromagnetic pump by a function generator or excitation current controller is known. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 5-28496

  A conventional device that obtains a desired flow rate reduction characteristic by controlling power supply to an electromagnetic pump using a function generator or the like requires complicated control such as function switching of the power supply, and the function given by the function generator Was also complicated. In addition, when a desired flow rate reduction characteristic is obtained using a function generator, an emergency power supply facility of an electromagnetic pump is set to have a large capacity and a large output, and a necessary amount of power is supplied. For this reason, the emergency power supply facility becomes larger than the capacity and output actually required.

  The present invention has been made to solve these problems, and eliminates the need for conventional complicated control and excessive emergency power supply equipment, and is more reliable and smaller than the conventional electromagnetic pump. The object is to provide a fast reactor capable of achieving coolant flow characteristics.

In order to achieve the above object, a reactor containment vessel according to the present invention includes a reactor vessel, a core installed in the reactor vessel, and a coolant that is injected into the reactor vessel and heated by the core. , A first electromagnetic pump and a second electromagnetic pump for applying a driving force to the coolant in the reactor vessel, a first main power supply for supplying power to the first electromagnetic pump, and the second electromagnetic pump A second main power source for supplying electric power to the pump; and when the power supply from the first main power source to the first electromagnetic pump is interrupted, the first electromagnetic pump is supplied with electric power. The first emergency power source that drives the first electromagnetic pump with the first coolant flow rate reduction characteristic and the power supply to the second electromagnetic pump when the power supply from the second main power source to the second electromagnetic pump stops And the second electromagnetic pump is connected to the second coolant flow. Second and emergency power supply for driving in reduction characteristics, control the power supplied to the second electromagnetic pump from the second emergency power, power supply said second to said second electromagnetic pump A delay time for maintaining the coolant flow rate during a predetermined period of time after switching from the main power source to the second emergency power source equal to that during normal operation, and the coolant flow rate after the delay time has elapsed. Supply power control means for combining the flow rate reduction time that decreases with the passage of time to provide the second coolant flow rate reduction characteristic, and the first coolant flow rate reduction property and the second coolant flow rate reduction property. Are different from each other in terms of the storage principle of the first emergency power supply and the second emergency power supply. The first electromagnetic pump and the second electromagnetic pump are respectively the first emergency power supply and the second emergency power supply. Stop by power supply By the time different, characterized in that the reduction of the flow rate which is the sum of the said first electromagnetic pump second electromagnetic pump is configured to be stepwise slowly.

  According to the fast reactor of the present invention, by combining a plurality of electromagnetic pumps having a simple emergency power supply system composed of a power storage device and a synchronous machine, a flow rate reduction characteristic that approximates an ideal flow rate reduction characteristic is obtained. This makes it possible to eliminate the need for excessive equipment and complicated control.

  Embodiments of the present invention will be described below with reference to the drawings.

  The structure of the fast reactor and the arrangement of the electromagnetic pump will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an outline of a fast reactor in which a liquid metal is used as a coolant and a driving force is applied to the primary coolant by an electromagnetic pump.

  The structure of the fast reactor 101 will be described below with reference to FIG. A core support plate 104 is attached to the lower part of the reactor vessel 103 covered with the guard vessel 102, and a core support base 105 is installed on the core support plate 104. An entrance module 106 is installed on the core support 105. A core 107 is attached to the entrance module 106. Further, a furnace stop rod 108 is provided so as to be able to pass through the inside of the core 107, and the furnace stop rod 108 is connected to an upper furnace stop rod driving device 109. A reflector 110 is disposed so as to surround the reactor core 103. The reflector 110 includes a neutron reflector 110a and a hollow cavity 110b. The reflector 110 is moved up and down by an upper reflector driving device 111. The reflector driving device 111 and the furnace stop rod driving device 109 are covered with a storage dome 116. In the hollow portion of the cavity portion 110b, an inert gas or a metal having a neutron reflecting ability lower than that of the primary coolant is enclosed. A partition 112 is attached to the upper surface of the core support plate 104, and the partition 112 surrounds the reflector 110.

  An intermediate heat exchanger 113 is provided on the upper inner wall of the reactor vessel 103. The intermediate heat exchanger 113 includes a secondary coolant inlet nozzle 114 and a secondary coolant outlet nozzle 115, and exchanges heat between the primary coolant and the secondary coolant in the reactor vessel 103 inside the reactor vessel 103. Do. The electromagnetic pump 1 is attached to the lower part of the intermediate heat exchanger 113, and the electromagnetic pump 1 discharges the primary coolant that has exchanged heat in the intermediate heat exchanger 113 downward. In addition, the arrow in a figure has shown the direction through which a primary coolant flows.

  The arrangement of the electromagnetic pump 1 will be described with reference to FIG. 2 is a cross-sectional view taken along line AA shown in FIG. As shown in FIG. 2, four electromagnetic pumps 1 a, an electromagnetic pump 1 b, an electromagnetic pump 1 c, and an electromagnetic pump 1 d are installed between the partition wall 112 and the reactor vessel 103. The electromagnetic pump 1 includes the electromagnetic pump 1a, the electromagnetic pump 1b, the electromagnetic pump 1c, and the electromagnetic pump 1d. Other structures are not shown.

  Next, the emergency power supply system of the electromagnetic pump 1 will be described with reference to FIG. FIG. 3 is a block diagram showing an outline of the emergency power supply system of the electromagnetic pump 1a. The electromagnetic pump 1a is connected to the bus 21 and the synchronous machine 2a. The bus 21 is an electric wire that is connected to a main power supply system (ordinary power supply system) (not shown) and supplies power to the electromagnetic pump 1a during normal operation. The synchronous machine 2a is equipped with a flywheel 3a and is connected to the power storage device 4a. For example, SMES, a superconducting flywheel, or a secondary battery is used for the power storage device 4a. The synchronous machine 2a and the power storage device 4a function as an emergency power supply system for the electromagnetic pump 1a. Such an emergency power supply system is provided independently for each of the electromagnetic pump 1a, the electromagnetic pump 1b, the electromagnetic pump 1c, and the electromagnetic pump 1d. As for power storage device 4a, devices having different power storage principles may be employed in each emergency power supply system of electromagnetic pump 1a, electromagnetic pump 1b, electromagnetic pump 1c, and electromagnetic pump 1d.

  The power supply switching from the main power supply of the electromagnetic pump 1a to the emergency power supply will be described below. During normal operation, power is supplied from the main power supply system to the electromagnetic pump 1a via the bus 21. The synchronous machine 2a functions as a synchronous motor and rotates the flywheel 3a. When the power supply from the main power supply system to the electromagnetic pump 1a is interrupted for some reason, the flywheel 3a rotates due to inertia, and the synchronous machine 2a functions as a synchronous generator, and electric power is supplied to the electromagnetic pump 1a. . Thereafter, electric power is supplied from the battery 4a to the electromagnetic pump 1a. Thus, when the power supply from the main power supply is cut off, the synchronous machine 2a functions as an uninterruptible power supply device to prevent instantaneous interruption, and the power supply of the electromagnetic pump 1a is connected to the power storage device 4a which is an emergency power supply. Switch. The flow rate of the electromagnetic pump 1a after the power source is switched gradually decreases. The flow rate reduction characteristics of the electromagnetic pump 1a at this time are determined by the performance of the components of the electromagnetic pump 1a and the emergency power supply system, for example, the capacity of the power storage device 4a, the power storage time, the response time, and the like.

  Next, the output reduction of the core 107 will be described. When power loss occurs due to the main power supply breakage or disconnection of the electromagnetic pump 1, the reactor stop rod 108 is inserted into the core 107, the reflector 110 is lowered, and the effective multiplication factor Keff of the core 107 is significantly reduced. The output of the core 107 becomes Keff times every unit time. That is, since Keff is a value less than 1, the output of the core 107 decreases exponentially.

  A model of the power reduction characteristic of the core 107 is shown in FIG. FIG. 4 is a graph showing an outline of the core power reduction characteristic, in which the horizontal axis represents time and the vertical axis represents core power. During normal operation, the core power is maintained at p. At time t1, the main power of the electromagnetic pump 1 is lost, the furnace stop rod 108 is inserted, the reflector 110 is lowered, and the core output is lowered. The core power decreases so as to draw an asymptote according to the value of the effective multiplication factor Keff. The flow rate reduction characteristic of the primary coolant is desirably a characteristic that approximates the core power reduction curve in order to prevent generation of thermal transient stress in the reactor internal structure and overheating of the primary coolant.

  The flow rate reduction characteristics required for the electromagnetic pump 1 will be described in detail below. FIG. 5 is a flow rate reduction characteristic graph showing an outline of the flow rate reduction characteristic in the fast reactor 101. The horizontal axis represents the elapsed time, and the vertical axis represents the flow rate of the primary coolant in the fast reactor.

  This graph shows that the main power supply of the electromagnetic pump 1 is lost at time t1 and is switched to the emergency power supply, the primary coolant flow rate decreases from time t1 to time t2, and the electromagnetic pump 1 is turned off at time t2. An overview of a complete stop is shown.

  Until the time t1, the fast reactor 101 is normally operated, and the primary coolant flow rate f1 in the normal operation is maintained. At time t1, the main power source of the electromagnetic pump 1 is lost, the power source of the electromagnetic pump 1 is switched to the emergency power source, and the primary coolant flow rate starts to decrease. Further, as the main power supply is lost, the reflector 110 and the reactor stop rod 108 fall to give the reactor core 107 a negative reactivity, and the output of the reactor core 107 decreases. Until the time t2 is reached, the primary coolant flow rate continues to decrease, and the decreasing gradient of the primary coolant flow rate decreases with time. That is, as the time t2 approaches, the primary coolant flow rate decreases gradually. When time t2 is reached, the electromagnetic pump 1 is completely stopped and the primary coolant flow rate is f2. f2 is a flow rate by the convection of the primary coolant generated by the fluid inertia of the primary coolant and the temperature distribution in the fast reactor 101. In FIG. 5, the flow rate after time t2 is shown linearly. Strictly speaking, the flow rate approaches 0 because the flow rate due to the fluid inertia and the convection of the primary coolant also decreases with the passage of time. .

  In FIG. 5, it is most preferable that the decrease in the primary coolant flow rate from the time t1 to the time t2 decreases in the same manner as the decrease in the core power shown in FIG. This is because the primary coolant temperature at the outlet of the core 107 and the steam conditions are maintained at the same level as during normal operation.

  The configuration of the electromagnetic pump 1 according to this embodiment for obtaining a characteristic approximate to the flow rate reduction characteristic shown in FIG. 5 will be described below with reference to FIG. 6A shows the outline of the flow reduction characteristics of the electromagnetic pump 1a, FIG. 6B shows the electromagnetic pump 1b, FIG. 6C shows the electromagnetic pump 1c, and FIG. 6D shows the flow reduction characteristics of the electromagnetic pump 1d. It is a graph.

  At time t1, the power source of the electromagnetic pump 1 is switched to the emergency power source system, and the primary coolant flow rate decreases. The electromagnetic pump 1a, the electromagnetic pump 1b, the electromagnetic pump 1c, and the electromagnetic pump 1d have different flow rate reduction characteristics. The electromagnetic pump 1a, the electromagnetic pump 1b, the electromagnetic pump 1c, and the electromagnetic pump 1d are in the order of time t3, time t4, It stops at time t5 and time t2. This time t2 corresponds to the time t2 shown in FIG. Such a difference in flow rate reduction characteristics can be obtained by constructing the emergency power supply systems of the electromagnetic pump 1a, the electromagnetic pump 1b, the electromagnetic pump 1c, and the electromagnetic pump 1d with different designs.

  FIG. 7 shows the flow rate reduction characteristics of the primary coolant in the fast reactor 101 provided with these electromagnetic pump 1a, electromagnetic pump 1b, electromagnetic pump 1c, and electromagnetic pump 1d. For comparison, the flow rate reduction characteristics shown in FIG. 5 are indicated by a one-dot chain line.

  At time t1, the power supply of the electromagnetic pump 1 is switched to the emergency power supply system, and the flow rate of the primary coolant decreases from the flow rate f1. At time t3, the electromagnetic pump 1a is completely stopped, and the decrease in the flow rate becomes gradual as compared with the time between time t1 and time t3. Similarly, the electromagnetic pump 1b stops at time t4, and the electromagnetic pump 1c stops at time t5, and the flow rate decreases gradually. When the electromagnetic pump 1d stops at time t2, the electromagnetic pump 1 stops completely and reaches the flow rate f2.

  In this way, by combining electromagnetic pumps having different flow rate reduction characteristics, it is possible to obtain a flow rate reduction characteristic that approximates the flow rate reduction characteristic of FIG. 5 shown by a one-dot chain line in FIG. Since the emergency power supply system of each of the electromagnetic pump 1a, the electromagnetic pump 1b, the electromagnetic pump 1c, and the electromagnetic pump 1d does not require a function generator or an excitation current control device, it does not require complicated control as in the past. The configuration of the power supply system can be simplified, the reliability can be improved, and the system can be reduced in size and cost.

  According to this embodiment, it is possible to obtain a flow rate reduction characteristic that approximates an ideal flow rate reduction characteristic by combining a plurality of electromagnetic pumps equipped with a simple emergency power supply system configured by a power storage device and a synchronous machine. It is.

  Furthermore, immediately after the electromagnetic pump is stopped, the pressure near the outlet of the stopped electromagnetic pump temporarily decreases. By providing a check valve on the outlet side of each of the electromagnetic pump 1a, the electromagnetic pump 1b, the electromagnetic pump 1c, and the electromagnetic pump 1d, it is possible to prevent turbulence and backflow due to a pressure drop near the temporary outlet. .

  A second embodiment of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same structure as a 1st Example, and the overlapping description is abbreviate | omitted.

  FIG. 8 is a block diagram showing an outline of the emergency power supply system of the electromagnetic pump 1 in this embodiment. As shown in FIG. 8, the electromagnetic pump 1a and the electromagnetic pump 1c share an emergency power supply system, and the electromagnetic pump 1b and the electromagnetic pump 1d share an emergency power supply system. In such a configuration, the flow rate reduction characteristics of the electromagnetic pump 1a and the electromagnetic pump 1c are the same, and the flow rate reduction characteristics of the electromagnetic pump 1b and the electromagnetic pump 1d are the same.

  An example of each flow rate reduction characteristic will be described below with reference to FIG. 9A shows the flow rate reduction characteristics of the electromagnetic pump 1a and the electromagnetic pump 1c, and FIG. 9B shows the flow rate reduction characteristics of the electromagnetic pump 1b and the electromagnetic pump 1d. The electromagnetic pump 1a and the electromagnetic pump 1c start to decrease the flow rate at time t1, and stop at time t6. Time t6 is earlier than time t2. Further, the electromagnetic pump 1b and the electromagnetic pump 1d start to decrease the flow rate at time t1, and stop at time t2.

  FIG. 10 shows the flow rate reduction characteristics of the primary coolant in the fast reactor 101 provided with these electromagnetic pump 1a, electromagnetic pump 1b, electromagnetic pump 1c, and electromagnetic pump 1d. For comparison, the flow rate reduction characteristics shown in FIG. 5 are indicated by a one-dot chain line.

  A power loss occurs at time t1, and the power supply of the electromagnetic pump 1 is switched from the main power supply to the emergency power supply system, and the flow rate reduction starts. When the time t6 is reached, the electromagnetic pump 1a and the electromagnetic pump 1c are completely stopped, and the decrease in the flow rate of the primary coolant becomes more gradual than from the time t1 to the time t6. When the time t2 is reached, the electromagnetic pump 1b and the electromagnetic pump 1d are completely stopped, and the flow rate of the primary coolant is only due to fluid inertia and convection.

  According to the present embodiment, although the accuracy of approximation of the flow rate reduction characteristic is assumed to be lower than that of the first embodiment, the emergency power system is shared by a plurality of electromagnetic pumps. It is possible to reduce the power supply system. Further, on the cross section of the fast reactor 101, the flow of the primary coolant in the entire furnace can be made more uniform by providing the same flow rate reduction characteristics by setting a pair of opposed electromagnetic pumps.

  A third embodiment of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same structure as a 1st Example, and the overlapping description is abbreviate | omitted. In the present embodiment, a function generator 5b is provided between the synchronous machine 2b and the power storage device 4b for the emergency power supply system of the electromagnetic pump 1b. Similarly, the function generator 5d is provided for the emergency power supply system of the electromagnetic pump 1d. The function generator 5b and the function generator 5d are supply power control means for controlling the supply of power from the power storage device 4b and the power storage device 4d to the electromagnetic pump 2b and the electromagnetic pump 2d, respectively. In addition, the function generator is not provided in the emergency power supply system of the electromagnetic pump 1a and the electromagnetic pump 1c.

  The primary coolant flow rate reduction characteristics of the electromagnetic pump 1a and the electromagnetic pump 1c are shown in FIG. 12 (a), the flow rate reduction characteristics of the electromagnetic pump 1b are shown in FIG. 12 (b), and the flow rate reduction characteristics of the electromagnetic pump 1d are shown in FIG. . The electromagnetic pump 1a and the electromagnetic pump 1 start to decrease the flow rate from the time t1 when the power loss occurs, and stop completely at the time t7. In the electromagnetic pump 1b and the electromagnetic pump 1d, the delay time of the flow rate reduction start is set by the function generator 5b and the function generator 5d, respectively. The electromagnetic pump 1b starts decreasing at time t7 and stops at time t8, and the electromagnetic pump 1d starts decreasing at time t8 and stops at time t2. Regarding the decrease in the flow rates of the electromagnetic pump 1b and the electromagnetic pump 1d, the gradient between the time t7 and the time t8 of the electromagnetic pump 1b is smaller than the gradient between the time t8 and the time t2 of the electromagnetic pump 1d.

  That is, the function generators 5b and 5d control the electric power supplied to the electromagnetic pumps 1b and 1d, so that the coolant flow rates of the electromagnetic pumps 1b and 1d during a predetermined time after the occurrence of power loss are The delay time maintained to be equal and the flow rate decrease time during which the coolant flow rate decreases with the elapse of time after the delay time has elapsed are combined to provide the coolant flow rate reduction characteristics of the electromagnetic pumps 1b and 1d.

  FIG. 13 shows the flow rate reduction characteristics of the primary coolant in the fast reactor 101 provided with these electromagnetic pump 1a, electromagnetic pump 1b, electromagnetic pump 1c, and electromagnetic pump 1d. For comparison, the flow rate reduction characteristics shown in FIG. 5 are indicated by a one-dot chain line.

  The power loss occurs at time t1, and the power source of the electromagnetic pump 1 is switched from the main power source to the emergency power source system, and the flow rate of the electromagnetic pump 1a and the electromagnetic pump 1c starts to decrease. In the electromagnetic pump 1b and the electromagnetic pump 1d, since the delay time is set by the function generator 5b and the function generator 5d, the flow rate does not decrease at this time. When the time t7 is reached, the electromagnetic pump 1a and the electromagnetic pump 1c are completely stopped, and the flow rate of the electromagnetic pump 1b starts to decrease. Since the flow rate reduction rate of the electromagnetic pump 1b is lower than the sum of the flow rate reduction rates of the electromagnetic pump 1a and the electromagnetic pump 1c, the flow rate reduction rate of the electromagnetic pump 1 as a whole decreases. Furthermore, when the time t8 is reached, the electromagnetic pump 1b is completely stopped, and the flow rate of the electromagnetic pump 1d starts decreasing. Since the decrease in the flow rate of the electromagnetic pump 1d is more gradual than the decrease in the flow rate of the electromagnetic pump 1b as described above, the flow rate reduction rate of the electromagnetic pump 1 as a whole further decreases. When the time t2 is reached, the electromagnetic pump 1d is completely stopped, and the flow rate of the primary coolant is only due to fluid inertia and convection.

  According to this embodiment, the same effect as that of the first embodiment can be obtained, and a delay time and a linear function can be obtained by combining a plurality of electromagnetic pumps having different flow rate reduction characteristics when driven by the emergency power supply system. It is possible to obtain a flow rate reduction characteristic that approximates an ideal flow rate reduction characteristic by simple control combined. When the electromagnetic pump 1a, the electromagnetic pump 1b, the electromagnetic pump 1c, and the electromagnetic pump 1d are given similar characteristics by the function generator as in the prior art, each of the electromagnetic pump 1a, the electromagnetic pump 1b, the electromagnetic pump 1c, and the electromagnetic pump 1d Since it is necessary to provide a flow rate reduction characteristic that approximates the ideal flow rate reduction characteristic, it is possible to simplify the setting of the function generator as compared with the conventional case. For example, an exciting current controller can be provided as an alternative to the function generator.

  The embodiments of the present invention have been described above with reference to the drawings. However, a configuration in which the features described in the plurality of embodiments are arbitrarily combined may be used. For example, by combining the second and third embodiments, two electromagnetic pumps are connected to two emergency power systems, and a function generator is installed only in one emergency power system to set the delay time. It is possible to do that.

  In each embodiment, the electromagnetic pump 1a, the electromagnetic pump 1b, the electromagnetic pump 1c, and the electromagnetic pump 1d are described as completely stopping at the time t2, but the design is such that they completely stop at a time earlier than the time t2. Of course it is also possible.

1 is a longitudinal sectional view showing an outline of a fast reactor 101 according to a first embodiment of the present invention. The AA sectional view taken on the line of the fast reactor 101 according to the first embodiment. The block diagram which shows the outline | summary of the emergency power supply system of the electromagnetic pump 1a by a 1st Example. The graph which shows the outline | summary of the output fall characteristic of the core 107. FIG. The graph which shows the outline | summary of the ideal primary coolant flow rate reduction characteristic. The graph which shows the outline | summary of the flow volume reduction characteristic of (a) electromagnetic pump 1a, (b) electromagnetic pump 1b, (c) electromagnetic pump 1c, (d) electromagnetic pump 1d by a 1st Example. The graph which shows the outline | summary of the flow volume reduction | decrease characteristic of the electromagnetic pump 1 by a 1st Example. The block diagram which shows the outline | summary of the emergency power supply system of the electromagnetic pump 1 by a 2nd Example. The graph which shows the outline | summary of the flow volume reduction | decrease characteristic of (a) electromagnetic pump 1a, electromagnetic pump 1c, (b) electromagnetic pump 1b, and electromagnetic pump 1d by 2nd Example. The graph which shows the outline | summary of the flow volume reduction characteristic of the electromagnetic pump 1 by a 2nd Example. The block diagram which shows the outline | summary of the emergency power supply system of the electromagnetic pump 1b by a 3rd Example. The graph which shows the outline | summary of the flow volume reduction characteristic of (a) electromagnetic pump 1a, electromagnetic pump 1c, (b) electromagnetic pump 1b, (c) electromagnetic pump 1d by 3rd Example. The graph which shows the outline | summary of the flow rate phenomenon characteristic of the electromagnetic pump 1 by a 3rd Example.

Explanation of symbols

1, 1a, 1b, 1c, 1d Electromagnetic pumps 2a, 2b, 2c, 2d Synchronous machines 3a, 3b, 3c, 3d Flywheels 4a, 4b, 4c, 4d Power storage device 21 Bus 101 Fast reactor 102 Guard vessel 103 Reactor vessel 104 Core support plate 105 Core support stand 106 Entrance module 107 Core 108 Reactor stop rod 109 Reactor stop rod drive device 110 Reflector 110a Neutron reflector 110b Cavity portion 111 Reflector drive device 112 Bulkhead 113 Intermediate heat exchanger 114 Secondary coolant Inlet nozzle 115 Secondary coolant outlet nozzle 116 Storage dome

Claims (2)

A reactor vessel;
A reactor core installed in the reactor vessel;
A coolant injected into the reactor vessel and heated by the core;
A first electromagnetic pump and a second electromagnetic pump for applying a driving force to the coolant in the reactor vessel;
A first main power supply for supplying power to the first electromagnetic pump;
A second main power supply for supplying power to the second electromagnetic pump;
When power supply from the first main power supply to the first electromagnetic pump is interrupted, power is supplied to the first electromagnetic pump, and the first electromagnetic pump is driven with a first coolant flow reduction characteristic. 1 emergency power supply,
When power supply from the second main power supply to the second electromagnetic pump is interrupted, power is supplied to the second electromagnetic pump, and the second electromagnetic pump is driven with a second coolant flow reduction characteristic. 2 emergency power supplies,
The power supplied to the second electromagnetic pump from the second emergency power supply is controlled, and the power supply to the second electromagnetic pump is switched from the second main power supply to the second emergency power supply. A combination of a delay time for maintaining the coolant flow rate during a predetermined time equal to that during normal operation, and a flow rate reduction time during which the coolant flow rate decreases with time after the delay time has elapsed. Supply power control means having a second coolant flow rate reduction characteristic,
The first coolant flow rate reduction characteristic and the second coolant flow rate reduction characteristic are different,
The storage principle of the first emergency power supply and the second emergency power supply is different,
The first electromagnetic pump and the second electromagnetic pump are different in time until stoppage by the first emergency power supply and the second emergency power supply, respectively, so that the first electromagnetic pump and the second electromagnetic pump are different. A fast reactor characterized in that the reduction of the total flow rate of the pumps is gradually reduced . The first electromagnetic pump controls power supplied from the first emergency power supply to the first electromagnetic pump, and the power supply to the first electromagnetic pump is supplied from the first main power supply to the second power supply. A delay time for maintaining the coolant flow rate during a predetermined time after switching to the emergency power source at the same level as during normal operation, and a flow rate decrease time during which the coolant flow rate decreases with time after the delay time has elapsed. And other supply power control means for combining the first coolant flow rate reduction characteristics with a combination of
The fast reactor according to claim 1, wherein a delay time of the first electromagnetic pump and a delay time of the second electromagnetic pump are different.

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