JP2007192671A - Internal pump operation method of boiling water reactor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more certainly secure a predetermined core flow, while avoiding the resonance region of a motor casing of an internal pump. <P>SOLUTION: In an internal pump operation method of driving the internal pump 3 in a boiling water reactor with a variable frequency power supply device 11, an operation of setting the speed of only a specific internal pump 3 to higher or lower than that of the other internal pumps or of stopping it, and operation for automatically controlling each variable frequency power supply device 11 according to the core flow are performed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of operating an internal pump (reactor built-in recirculation pump: RIP) in an improved boiling water reactor (ABWR).

  The improved boiling water reactor has been developed with the goal of improving safety and reliability, improving operability and operability, and reducing exposure to workers. Is adopted. The internal pump is a single-stage mixed flow pump driven by a wet motor without a shaft seal, and is configured to incorporate a motor unit in a motor casing provided in a reactor pressure vessel lower mirror, for example, a reactor pressure vessel Ten units are installed inside. Then, the core flow rate is adjusted by adjusting the speed of these internal pumps, and the output control is performed using the characteristic that the reactor output changes approximately in proportion to the core flow rate.

  Conventionally, the operation method of such an internal pump basically controls all units at the same rotational speed. Moreover, it was set as the operation which changes the rotation speed of an internal pump for every power supply device by switching to manual. When switching to manual operation, the core flow rate must be controlled manually.

  However, if the rotation speed of the internal pump is controlled at the same rotation speed, the pump speed becomes the motor casing resonance region of the internal pump when the operation is performed to reduce the core flow rate in the reactor rated output state during normal plant operation. It is assumed that

  FIG. 41 is a graph showing the relationship between the pump speed (horizontal axis) of the internal pump and the motor casing vibration speed (vertical axis). As shown by the characteristic line a in FIG. 41, a motor casing resonance region a1 is recognized in the region where the pump speed is increasing. On the low-speed rotation side and the high-speed rotation side from the motor casing resonance area a1, resonance avoidance areas a2 and a3 where vibration is small are recognized.

  On the other hand, in the conventional technology, when the speed is to be controlled automatically, all the internal pumps in operation are basically operated at the same speed. In order to ensure the flow rate, the speed of the internal pump may become the resonance region of the motor casing. In this way, the internal pump is held and operated in the resonance region during normal plant operation, which is not preferable.

In this regard, the applicant has determined that the core flow rate control allows the internal pump to continuously control the internal pump in response to the required core flow rate without continuously operating the internal pump at a speed at which vibrations increase. A method and the control device have already been proposed (see Patent Document 1).
JP 2004-205296 A

  As described above, when the internal pump speed is controlled at the same speed, the pump speed is adjusted to reduce the internal pump motor casing resonance during operation to reduce the core flow rate in the reactor rated output state during normal plant operation. It is assumed to be an area. In this case, since the conventional technology is based on operating all internal pumps at the same speed when trying to automatically control the speed, the core flow rate required for normal plant operation is required. There is a possibility that the speed of the internal pump becomes the resonance region of the motor casing. In this way, the internal pump is held and operated in the resonance region during normal plant operation, which is not preferable.

  Also, if the internal pump trips when a transient event such as power loss occurs, the internal pump that does not have an MG set upstream of the variable frequency power supply (ASD) is operated at a high speed, so the internal pump The amount of decrease in the core flow rate due to the trip increases and the degree of influence on the fuel increases.

  Further, the conventional technique can cope with this by switching the control of the pump speed to manual, but the operation becomes complicated because it is necessary to control the core flow rate manually.

  In view of such circumstances, the present invention further embodies the previous proposal, and is capable of ensuring a predetermined core flow rate more reliably while avoiding the resonance region of the motor casing of the internal pump. It aims at providing the internal pump operating method of a furnace.

  In order to achieve the above object, according to the present invention, in the internal pump operation method in which the internal pump of a boiling water reactor is driven by a variable frequency power supply device, only a specific internal pump is replaced with another internal pump. A method for operating an internal pump of a boiling water reactor is also provided, in which an operation for setting a high speed or a low speed and an operation for automatically controlling individual variable frequency power supply devices according to the core flow rate are performed.

  Further, according to the present invention, in the internal pump operation method in which the internal pump of the boiling water reactor is driven by the variable frequency power supply device, the operation of stopping only the specific internal pump and the individual variable according to the core flow rate. Provided is an internal pump operation method for a boiling water reactor characterized by performing an operation of automatically controlling a frequency power supply device.

  ADVANTAGE OF THE INVENTION According to this invention, the operating method and control apparatus which ensure a predetermined core flow volume more reliably can be provided, avoiding the resonance area | region of the motor casing of an internal pump.

  Specifically, even if it becomes necessary to perform continuous operation in the motor casing resonance region of the internal pump for all internal pumps to compensate for the core flow rate during normal plant operation, the resonance region is avoided and the The null pump can be operated continuously.

  Further, even when the speeds of some internal pumps are changed at the same time, the core flow rate can be controlled by automatically changing the speeds of other internal pumps.

  In addition, by reducing the speed of the internal pump that does not have an MG set upstream of the variable frequency power supply unit, the amount of decrease in the core flow rate can be reduced even when the internal pump trips when a transient event such as power loss occurs. It becomes possible to suppress.

  Furthermore, even in a state where the pump speed is unbalanced, it is possible to achieve a combination that minimizes the deviation of the core flow rate in each power supply configuration.

  Hereinafter, an embodiment of an internal pump operation method for a boiling water reactor according to the present invention will be described with reference to the drawings. In the following description, among the internal pumps A, B, C, D, E, F, G, H, J, and K shown in FIG. 2, FIG. 6, FIG. Are indicated by black circles, those for high-speed operation are indicated by white circles, and those to be stopped are marked with x.

[First Embodiment (FIGS. 1 to 4)]
In the present embodiment, an internal pump operation is performed in which only a specific internal pump is operated at a higher speed or a lower speed than other internal pumps and an operation in which individual variable frequency power supply devices are automatically controlled according to the core flow rate. A method will be described.

  FIG. 1 is an explanatory view showing an equipment configuration for carrying out an internal pump operation method according to a first embodiment of the present invention, and FIG. 2 shows an example of distribution of pump speeds of each internal pump in the same embodiment. FIG.

  As shown in FIG. 2, in the internal pump operation method of the present embodiment, ten internal pumps (reactor built-in type recirculation pump: RIP) 3 are installed in a region surrounding the core 2 in the reactor pressure vessel 1. Targeted is a boiling water reactor. In FIG. 2, these ten internal pumps 3 are given alphabetic capital letters “A, B, C, D, E, F, G, H, J, K”, respectively.

  In FIG. 1, these ten internal pumps 3 (A, B, C, D, E, F, G, H, J, K) are shown in a horizontal line, and each of these internal pumps 3 is illustrated. An electric circuit configuration for driving the pump 3 (A, B, C, D, E, F, G, H, J, K) is shown.

  As shown in FIG. 1, power is supplied from an external power source through the main transformer 4 or from the on-site generator 5 through the load switch 6. The supplied current is transformed by the direct-coupled transformer 7, and the direct-coupled transformer 7 is connected to four systems of the first-stage power receiving circuit breaker 8 and the second-stage power receiving circuit breaker 9, and further the power reception interruption. The internal pump 3 is connected to the device 9 through an input transformer 10, a variable frequency power supply (ASD) 11 for power frequency conversion, and a switch 12. An MG set 13 (a set of an AC motor M and an AC generator G) and a power receiving breaker 14 are provided on the upstream side of the specific variable frequency power supply device 11.

  The ten internal pumps 3 are respectively driven by the corresponding variable frequency power supply devices 11 and a total of six internal pumps 3 ((B, E, H) and (C, G, K)). The power supply is maintained by the MG set 13, and a total of four internal pumps (3 (A, F) and (D, J)) are not operated by the MG set 13. It has been adopted. In addition, an operation in which each internal pump 3 is automatically controlled according to the core flow rate is performed by a control device (not shown).

  Each of the three internal pumps 3 ((B, E, H) and (C, G, K)) having the MG set 13 are arranged at the corner positions of different triangles as shown in FIG. . Further, the internal pumps 3 ((A, F) and (D, G)) driven by the variable frequency power supply device 11 that does not have the MG set 13 are respectively arranged at the target positions.

  In the present embodiment, only the specific internal pump 3 is operated at a higher speed or a lower speed than the other internal pumps, and an operation for automatically controlling each variable frequency power supply device in accordance with the core flow rate. Specifically, only another specific internal pump 3 (for example, “G”) is used in order to slow down only a specific internal pump 3 (for example, “A”) and compensate for the coolant flow rate decrease. Is fast.

  FIG. 3 is a graph for explaining the operation of the present embodiment. The vertical axis represents the motor casing vibration speed, and the horizontal axis represents the pump speed. As shown in FIG. 3, the motor casing resonance area a1 exceeding the motor vibration great vibration threshold appears at a substantially intermediate speed of the pump speed. In FIG. 3, as an avoidance region for avoiding resonance, a constant region a2 having a vibration speed smaller than the motor vibration large vibration threshold value is set to a speed relative to the internal pump 3 exceeding the vibration large threshold value c. The pump speed area | region a2 after having decreased is illustrated. The pump speed of the specific internal pump 3 (“A”) is set in this low speed side pump speed region a2.

  FIG. 4 shows the speed of the other internal pumps 3 in order to avoid resonance and compensate the core flow rate after reducing the speed of the internal pump 3 exceeding the vibration threshold a1. The speed region a3 after increasing is illustrated. In order to compensate for the decrease in coolant flow rate, the pump speed of another specific internal pump 3 (“G”) is set in the pump speed region a2 on the high speed side.

  As described above, according to the operation method of the present embodiment, only the specific internal pump 3 is operated at a higher speed or lower speed than the other internal pumps 3, and individual variable frequency power supply devices are set according to the core flow rate. Even if it is necessary to perform continuous operation in the motor casing resonance region a1 of all the internal pumps internal pumps 3 to compensate for the core flow rate during normal plant operation, By operating in the avoidance regions a2 and a3 of the resonance region a1, the internal pump 3 can be continuously operated.

  Further, even when the speeds of some internal pumps 3 are changed at the same time, the core flow rate can be controlled by automatically changing the speeds of the other internal pumps 3.

  Therefore, since the conventional technology is based on the operation of ten internal pumps at the same rotational speed, as shown in FIG. 41, the internal pump is required to ensure the core flow rate required in the normal operation state of the plant. In contrast to the possibility that the speed of the null pump 3 becomes the resonance region a1 of the motor casing, in this embodiment, the speed of the specific internal pump 3 is resonated due to a large vibration in such a case. It is possible to ensure the necessary core flow while avoiding the region by automatic control.

[Second Embodiment (FIGS. 5 and 6)]
In the present embodiment, in the internal pump operation method in which the internal pump of the boiling water reactor is driven by the variable frequency power supply device, the operation of stopping only the specific internal pump and the individual variable frequency according to the core flow rate. A method for operating an internal pump of a boiling water reactor that performs an operation of automatically controlling a power supply device will be described.

  FIG. 5 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the second embodiment of the present invention, and FIG. 6 shows an example of the pump speed distribution of each internal pump in the same embodiment. FIG.

  As shown in FIG. 6, even in the internal pump operation method of the present embodiment, 10 internal pumps (reactor built-in type recirculation pump: RIP) 3 are provided in a region surrounding the core 2 in the reactor pressure vessel 1. Targeted is a boiling water reactor. In FIG. 6, these ten internal pumps 3 are given alphabetic capital letters “A, B, C, D, E, F, G, H, J, K”, respectively.

  FIG. 5 shows these ten internal pumps 3 (A, B, C, D, E, F, G, H, J, and K) expanded in a horizontal row, and each of these internal pumps. An electric circuit configuration for driving the pump 3 (A, B, C, D, E, F, G, H, J, K) is shown.

  As shown in FIG. 5, power is supplied from an external power source via the main transformer 4 or from the on-site generator 5 via the load switch 6. The supplied current is transformed by a direct-coupled transformer 7, and four systems of a first-stage receiving circuit breaker 8 and a second-stage receiving circuit breaker 9 are connected to the direct-connected transformer 7. An internal pump 3 is connected to the circuit breaker 9 via an input transformer 10, a variable frequency power supply (ASD) 11 for power frequency conversion, and a switch 12. An MG set 13 (a set of an AC motor M and an AC generator G) and a power receiving breaker 14 are provided on the upstream side of the specific variable frequency power supply device 11.

  The ten internal pumps 3 are respectively driven by the corresponding variable frequency power supply devices 11 and a total of six internal pumps 3 ((B, E, H) and (C, G, K)). The power supply is maintained by the MG set 13, and a total of four internal pumps (3 (A, F) and (D, J)) are not operated by the MG set 13. It has been adopted. In addition, an operation in which each internal pump 3 is automatically controlled according to the core flow rate is performed by a control device (not shown).

  Each of the three internal pumps 3 ((B, E, H) and (C, G, K)) having the MG set 13 is arranged at a corner position of a different triangle as shown in FIG. . Further, the internal pumps 3 ((A, F) and (D, G)) driven by the variable frequency power supply device 11 that does not have the MG set 13 are respectively arranged at the target positions.

  In this embodiment, an operation for stopping only the specific internal pump 3 and an operation for automatically controlling individual variable frequency power supply devices according to the core flow rate are performed. Specifically, only a specific internal pump 3 (for example, “J”) is stopped. As described above, when a predetermined core flow rate is obtained in the operation of all the internal pumps 3 and the resonance region is reached, one or more internal pumps 3 (“J”) are stopped to remain. By making the internal pump speed at or above the resonance region or higher, it is possible to ensure the necessary core flow rate by automatic control while avoiding the resonance region.

  According to the operation method of the present embodiment, the operation of stopping only the specific internal pump 3 and the operation of automatically controlling the individual variable frequency power supply devices 11 according to the core flow rate are performed, so that the plant is in normal operation. Even if it becomes necessary to perform continuous operation in the motor casing resonance region of all internal pumps in order to compensate for the core flow rate, the internal pump 3 can be operated by operating in the avoidance region of the resonance region. Can be operated continuously. In other words, when a predetermined core flow rate is obtained in the operation of all internal pumps and the resonance region is reached, one or more internal pumps are stopped, so that the remaining internal pump speed is set to the resonance region or more. Thus, it is possible to ensure the necessary core flow rate while avoiding the resonance region by automatic control.

[Third Embodiment (FIGS. 7 and 8)]
In the present embodiment, 10 internal pumps of boiling water reactors are individually driven by the corresponding variable frequency power supply devices, and a total of 6 variable frequency power supply devices are maintained by the MG set. In the internal pump operation method, the variable frequency power supply devices are grouped into those having an MG set and those having no MG set, and the internal pumps of the group driven by the variable frequency power supply device not having the MG set are classified into the MG set. An internal pump operation method for performing an operation at a higher speed or a lower speed than an internal pump of a group driven by the variable frequency power supply device and an operation of automatically controlling individual variable frequency power supply devices according to the core flow rate explain.

  FIG. 7 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the third embodiment of the present invention, and FIG. 8 shows an example of the distribution of the pump speed of each internal pump in the same embodiment. FIG.

  As shown in FIG. 8, in the internal pump operation method of the present embodiment, ten internal pumps (reactor built-in type recirculation pump: RIP) 3 are provided in a region surrounding the core 2 in the reactor pressure vessel 1. Targeted is a boiling water reactor. In FIG. 2, these ten internal pumps 3 are given alphabetic capital letters “A, B, C, D, E, F, G, H, J, K”, respectively.

  In FIG. 7, these ten internal pumps 3 (A, B, C, D, E, F, G, H, J, K) are shown in a horizontal line, and each of these internal pumps 3 is illustrated. An electric circuit configuration for driving the pump 3 (A, B, C, D, E, F, G, H, J, K) is shown.

  As shown in FIG. 7, power is supplied from an external power source via the main transformer 4 or from the on-site generator 5 via the load switch 6. The supplied current is transformed by a direct-coupled transformer 7, and four systems of a first-stage receiving circuit breaker 8 and a second-stage receiving circuit breaker 9 are connected to the direct-connected transformer 7. An internal pump 3 is connected to the circuit breaker 9 via an input transformer 10, a variable frequency power supply (ASD) 11 for power frequency conversion, and a switch 12. An MG set 13 (a set of an AC motor M and an AC generator G) and a power receiving breaker 14 are provided on the upstream side of the specific variable frequency power supply device 11.

  The ten internal pumps 3 are respectively driven by the corresponding variable frequency power supply devices 11 and a total of six internal pumps 3 ((B, E, H) and (C, G, K)). The power supply is maintained by the MG set 13, and a total of four internal pumps (3 (A, F) and (D, J)) are not operated by the MG set 13. It has been adopted. In addition, an operation in which each internal pump 3 is automatically controlled according to the core flow rate is performed by a control device (not shown).

  Further, an operation in which each variable frequency power supply device 11 is automatically controlled according to the core flow rate is performed by a control device (not shown).

  As shown in FIG. 8, the three internal pumps 3 ((B, E, H) and (C, G, K)) of the group having the MG set 13 are arranged at the corner positions of different triangles. Is done. Further, the internal pumps 3 ((A, F) and (D, G)) of the group driven by the variable frequency power supply device 11 that does not have the MG set 13 are arranged at the target positions.

  In this embodiment, one variable frequency power supply device 11 is installed for each of the internal pumps 13, and a power supply in which three MG sets 13 are installed upstream of a total of six internal pumps 3. In the configuration, the speed of the four internal pump pumps 3 ((A, F) and (D, J)) not connected to the MG set 13 is set to the remaining six pumps 3 (B, C, E, G). , H, K) to achieve a predetermined core flow rate.

  Since the conventional technology is based on the operation of ten internal pumps at the same rotational speed, the internal pump speed is set to the resonance region of the motor casing in order to ensure the core flow rate required in the normal operation state of the plant. There is a possibility. In this case, it is not preferable to maintain the internal pump speed in the resonance region. In such a case, the internal pump is divided into four and six groups, and the four groups are rotated at a lower speed than the resonance region. It is possible to ensure the necessary core flow rate by automatic control while avoiding the resonance region by increasing the number of rotations of the other six units.

  Moreover, since the speed of the internal pumps 3 (A, D, F, J) not connected to the MG set 13 is set low by setting such a rotation number distribution, the core flow rate due to power loss or the like is set. It is possible to suppress the decrease in the core flow rate in a transient event with a sudden decrease.

[Fourth Embodiment (FIGS. 9 and 10)]
In the present embodiment, there are a total of 10 variable frequency power supply devices 11 that can drive the internal pumps 3 one by one, and the MG set 13 is upstream of the variable frequency power supply devices 11 of the 6 internal pumps 3 in total. In the internal pump operation method of the boiling water reactor having the MG set 13, the variable frequency power supply 11 is made into one group depending on the presence or absence of the MG set 13, and the group driven by the variable frequency power supply 11 not having the MG set 13 is used. The operation of the internal pump 3 is made higher than the speed of the internal pumps 3 of the group driven by the variable frequency power supply device 11 having the MG set 13, and the individual variable frequency power supplies according to the core flow rate. The device 11 is automatically controlled.

  FIG. 9 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the fourth embodiment of the present invention, and FIG. 10 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the present embodiment, contrary to the third embodiment, the speeds of the four internal pumps 3 ((A, F) and (D, J)) not connected to the MG set 13 are set to the remaining six interfaces. A predetermined core flow rate is achieved by lowering the speed of the null pump 3 (B, C, E, G, H, K).

  Thus, it is possible to ensure a necessary core flow rate while avoiding the resonance region by automatic control.

[Fifth Embodiment (FIGS. 11 and 12)]
In the present embodiment, there are a total of 10 variable frequency power supply devices 11 capable of driving 10 internal pumps 3 one by one, and upstream of the variable frequency power supply device 11 of 6 internal pumps 3 in total. In the internal pump operation method of the boiling water reactor having the MG set 13 at the same time, two internal pumps 3 connected under one MG set 13 and three internal pumps not having the MG set 13 are used. The null pump 3 is set as one group, and the operation of the internal pump 3 of the group is made higher or lower than the speed of the internal pump 3 of the other group. A method for automatically controlling the variable frequency power supply device 11 will be described.

  FIG. 11 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the fifth embodiment of the present invention, and FIG. 12 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  Also in this embodiment, as shown in FIG. 12, in the internal pump operation method of this embodiment, 10 internal pumps (reactor built-in type recirculation pumps) are provided in a region surrounding the core 2 in the reactor pressure vessel 1. : RIP) 3 is a boiling water reactor. In FIG. 12, these ten internal pumps 3 are given alphabetic capital letters “A, B, C, D, E, F, G, H, J, K”, respectively.

  In FIG. 11, these ten internal pumps 3 (A, B, C, D, E, F, G, H, J, K) are shown in a horizontal line and each of these internal pumps is illustrated. An electric circuit configuration for driving the pump 3 (A, B, C, D, E, F, G, H, J, K) is shown.

  As shown in FIG. 11, power is supplied from an external power source via the main transformer 4 or from the on-site generator 5 via the load switch 6. The supplied current is transformed by a direct-coupled transformer 7, and four systems of a first-stage receiving circuit breaker 8 and a second-stage receiving circuit breaker 9 are connected to the direct-connected transformer 7. An internal pump 3 is connected to the circuit breaker 9 via an input transformer 10, a variable frequency power supply (ASD) 11 for power frequency conversion, and a switch 12. An MG set 13 (a set of an AC motor M and an AC generator G) and a power receiving breaker 14 are provided on the upstream side of the specific variable frequency power supply device 11.

  The ten internal pumps 3 are respectively driven by the corresponding variable frequency power supply devices 11 and a total of six internal pumps 3 ((B, E, H) and (C, G, K)). The MG set 13 maintains the power supply, and a total of four internal pumps 3 ((A, F) and (D, J)) are operated without the power supply being maintained by the MG set 13. It has been adopted. In addition, an operation in which each internal pump 3 is automatically controlled according to the core flow rate is performed by a control device (not shown).

  The variable frequency power supply device 11 is grouped into those having the MG set 13 and those having no MG set 13, and the group of internal pumps 3 (A, F, and D) driven by the variable frequency power supply device 11 not having the MG set 13. D, G) is operated at a higher or lower speed than the group of internal pumps 3 (B, E, H, C, G, K) driven by the variable frequency power supply 11 having the MG set 13. It is like that.

  Further, an operation in which each variable frequency power supply device 11 is automatically controlled according to the core flow rate is performed by a control device (not shown).

  As shown in FIG. 12, the three internal pumps 3 ((B, E, H) and (C, G, K)) of the group having the MG set 13 are arranged at the corner positions of different triangles. Is done. Further, the internal pumps 3 ((A, F) and (D, G)) of the group driven by the variable frequency power supply device 11 that does not have the MG set 13 are arranged at the target positions.

  Then, for example, two internal pumps 3 ((E, H)) connected under one MG set 13 and three internal pumps 3 not having the MG set 13 are grouped into one group. The operation of making the speed of the internal pump 3 of the group higher or lower than the speed of the internal pump 3 of the other group is performed, and the individual variable frequency power supply devices 11 are automatically controlled according to the core flow rate. .

  According to the present embodiment, the internal pump 3 that is connected to the MG set 13 and the internal pump 3 that is not connected to the MG set 13 are assigned as the number of rotations as one group, and it is necessary while avoiding the resonance region. It is possible to secure the core flow rate by automatic control.

[Sixth Embodiment (FIGS. 13 and 14)]
The sixth embodiment of the present invention has a total of 10 variable frequency power supply devices 11 that can drive 10 internal pumps 3 one by one, and the variable of 6 internal pumps 3 in total. In the internal water pump operation method of the boiling water reactor having the MG set 13 upstream of the frequency power supply device 11, only the specific internal pump 3 is operated at a higher speed or at a lower speed than the other internal pumps 3. At the same time, the individual variable frequency power supply 11 is automatically controlled according to the core flow rate.

  FIG. 13 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the sixth embodiment of the present invention, and FIG. 12 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  FIG. 6 is a diagram showing the power supply configuration and internal pump speed distribution according to the sixth aspect of the present invention. In FIG. 6, for example, only the internal pump 3 having large vibration in the resonance region can avoid the resonance region and secure the necessary core flow rate by automatic control.

[Seventh Embodiment (FIGS. 15 and 16)]
In the seventh embodiment of the present invention, there are a total of 10 variable frequency power supply devices 11 that can drive 10 internal pumps 3 one by one, and a total of 6 internal pumps 3 are variable. In the internal pump operation method of the boiling water reactor having the MG set 13 upstream of the frequency power supply device 11, five units are set as one group every other unit, and the speed of the internal pump 3 of that group is set to the other group. The operation of increasing or decreasing the speed of the internal pump 3 is performed, and the individual variable frequency power supply devices 11 are automatically controlled according to the core flow rate.

  FIG. 15 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the fifth embodiment of the present invention, and FIG. 16 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the present embodiment, every other unit is set to five units as one group, and the speed of the internal pump 3 of that group is made higher or lower than the internal pump rate of the other group, and every other unit is operated. The number of rotations of the internal pump 3 is assigned to the internal pump 3, and the necessary core flow rate can be secured by automatic control while avoiding the resonance region.

  Furthermore, it is possible to obtain an operation pattern with the least deviation of the core flow rate while performing the unbalanced operation of the internal pump 3.

[Eighth Embodiment (FIGS. 17 and 18)]
The eighth embodiment of the present invention has a total of 10 variable frequency power supply devices 11 that can drive 10 internal pumps 3 one by one, and the MG upstream of the variable frequency power supply device 11 of the internal pump 3. In the internal pump operation method of the boiling water reactor not having the set 13, only the specific internal pump 3 is operated at a higher speed or at a lower speed than the other internal pumps 3 and according to the core flow rate. Thus, the control of each variable frequency power supply device 11 is automatically performed.

  FIG. 17 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the eighth embodiment of the present invention, and FIG. 18 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the present embodiment, only the specific internal pump 3 is operated at a higher speed or at a lower speed than the other internal pumps 3 and the control of the individual variable frequency power supply devices 11 is automatically performed according to the core flow rate. By doing so, for example, only the internal pump 3 having a large vibration in the resonance region can avoid the resonance region and secure a necessary core flow rate by automatic control.

[Ninth Embodiment (FIGS. 19 and 20)]
The ninth embodiment of the present invention has a total of ten variable frequency power supply devices 11 that can drive ten internal pumps 3 one by one, and upstream of the variable frequency power supply device 11 of the internal pump 3. In the internal pump operation method of the boiling water reactor without the MG set 13, 5 units are set as one group every other unit, and the speed of the internal pump 3 of the group is compared with the internal pump speed of the other group. In addition, an operation for increasing or decreasing the frequency is performed, and control of each variable frequency power supply device 11 is automatically performed according to the core flow rate.

  FIG. 19 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the ninth embodiment of the present invention, and FIG. 20 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the present embodiment, every other unit is divided into five groups, and the operation is performed so that the internal pump 3 speed of the group is higher or lower than the internal pump speed of the other group, and the core flow rate is increased. The number of rotations of the internal pump 3 is allocated to every other unit by automatically controlling the individual variable frequency power supply devices 11 according to the above, and the necessary core flow rate is ensured while avoiding the resonance region. Is possible with automatic control.

  Furthermore, it is possible to obtain an operation pattern with the least deviation of the core flow rate while performing the unbalanced operation of the internal pump 3.

[Tenth Embodiment (FIGS. 21 and 22)]
The tenth embodiment of the present invention has two variable frequency power supply devices 11 each capable of driving two or three internal pumps 3 together, and the three variable frequency power supply devices 11 In an internal pump operation method of a boiling water reactor having an MG set 13 upstream, three variable frequency power supply devices having the MG set 13 and two variable frequency power supply devices 11 having no MG set 13 are provided. Dividing into groups, the operation of lowering the speed of the internal pump 3 driven by the two variable frequency power supply devices 11 to be lower than the speed of the internal pump 3 driven by the three variable frequency power supply devices 11 In addition, the control of each variable frequency power supply device 11 is automatically performed according to the core flow rate.

  FIG. 21 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the tenth embodiment of the present invention, and FIG. 2 shows an example of the distribution of pump speeds of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the present embodiment, one ASD is installed for every two or three internal pumps 3, and three MG sets 13 are installed upstream of a total of six internal pumps 3. In such a power supply configuration, the pump speeds of the four internal pumps 3 not connected to the MG set 13 are made lower than the pump speeds of the remaining six pumps to achieve a predetermined core flow rate.

  Since the conventional technology is based on the operation of ten internal pumps 3 at the same rotational speed, the speed of the internal pump 3 is set to the motor casing in order to ensure the core flow rate required in the normal operation state of the plant. There is a possibility of a resonance region. In this case, it is not preferable to maintain the speed of the internal pump 3 in the resonance region. In such a case, the internal pump 3 is divided into groups of four and six, and the four groups are separated from the resonance region. However, it is possible by automatic control to secure the necessary core flow rate while avoiding the resonance region by setting the other six units at a high rotational speed by reducing the rotational speed.

  In addition, since the speed of the internal pump 3 that is not connected to the MG set 13 is set to be low by setting such a rotation number distribution, the core flow rate is reduced in a transient event involving a rapid decrease in the core flow rate such as power loss. The reduction width can be suppressed.

[Eleventh Embodiment (FIGS. 23 and 24)]
The eleventh embodiment of the present invention has two variable frequency power supply apparatuses 11 each capable of driving two or three internal pumps 3 together, and the three variable frequency power supply apparatuses 11 In the internal pump operation method of the boiling water reactor having the MG set 13 in the upstream, the internal pump 3 for 3 units having the MG set 13 and the variable frequency power supply unit for 2 units not having the MG set 13 are grouped. The operation is performed such that the speed of the internal pump 3 driven by the two variable frequency power supply devices 11 is higher than the speed of the internal pump 3 driven by the three variable frequency power supply devices 11. Control of each variable frequency power supply 11 is automatically performed according to the core flow rate.

  FIG. 23 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the fifth embodiment of the present invention, and FIG. 24 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the present embodiment, it is divided into a group of three variable frequency power supply devices having the MG set 13 and two variable frequency power supply devices having no MG set 13 and is driven by the two variable frequency power supply devices 11. The internal pump is operated at a speed higher than the speed of the internal pump driven by the three variable frequency power supply devices 11, and the individual variable frequency power supply devices 11 are controlled according to the core flow rate. By carrying out automatically, contrary to 10th Embodiment, the pump speed of four internal pumps which are not connected to MG set 13 is made lower than the remaining six pump speeds, and predetermined core flow is achieved. By doing so, it is possible to ensure the necessary core flow rate while avoiding the resonance region by automatic control.

[Twelfth Embodiment (FIGS. 25 and 26)]
The twelfth embodiment of the present invention has two variable frequency power supply devices 11 each capable of driving two or three internal pumps 3 together, and the three variable frequency power supply devices 11 In the internal pump operation method for a boiling water reactor having an MG set 13 upstream, two internal pumps 3 connected under one MG set 13 and three internal pumps not having an MG set The null pump 3 is set as one group, and the operation of the internal pump 3 of the group is made higher or lower than the internal pump speed of the other group, and each variable frequency is changed according to the core flow rate. The power supply device 11 is automatically controlled.

  FIG. 25 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the twelfth embodiment of the present invention, and FIG. 26 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In this embodiment, the internal pumps 3 connected to the MG set 13 and the internal pumps 3 not connected are allocated as a group, and the number of rotations is allocated while avoiding the resonance region. It can be ensured by automatic control.

[Thirteenth Embodiment (FIGS. 27 and 28)]
The thirteenth embodiment of the present invention has two variable frequency power supply devices 11 each capable of driving two or three internal pumps 3 together, and the three variable frequency power supply devices 11 In the internal pump operation method of the boiling water reactor having the MG set 13 upstream, only the specific internal pump 3 is operated at a higher speed or lower speed than the other internal pumps 3 and the core flow rate is increased. The variable frequency power supply device 11 is automatically controlled according to the above.

  FIG. 27 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the thirteenth embodiment of the present invention, and FIG. 28 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the present embodiment, for example, only the internal pump 3 having a large vibration in the resonance region can avoid the resonance region and secure the necessary core flow rate by automatic control.

[Fourteenth Embodiment (FIGS. 29 and 30)]
The fourteenth embodiment of the present invention has two variable frequency power supply devices 11 each capable of driving two or three internal pumps 3 together, and the variable frequency power supply device of the internal pump 3 In the internal pump operation method of the boiling water reactor that does not have the MG set 13 upstream of 11, only the specific internal pump 3 is operated at a higher speed or at a lower speed than the other internal pumps 3. The variable frequency power supply 11 is automatically controlled according to the core flow rate.

  FIG. 29 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the fourteenth embodiment of the present invention, and FIG. 30 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the present embodiment, only the specific internal pump 3 is operated at a higher speed or at a lower speed than the other internal pumps 3 and the control of the individual variable frequency power supply devices 11 is automatically performed according to the core flow rate. By doing so, for example, only the internal pump 3 having a large vibration in the resonance region can avoid the resonance region and secure a necessary core flow rate by automatic control.

[Fifteenth embodiment (FIGS. 31 and 32)]
The fifteenth embodiment of the present invention is an internal pump operation having two MFGs (variable frequency power supply device 11 by MG set 13) that can drive ten internal pumps 3 in groups of five. In the method, the operation is carried out in such a manner that every other unit is set as one group, and the speed of the internal pump 3 of the group is made higher or lower than the internal pump speed of the other group, and the flow rate of the core is changed. Thus, control of individual variable frequency power supply devices is performed automatically.

  FIG. 11 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the fifth embodiment of the present invention, and FIG. 12 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  According to the present embodiment, the operation is performed such that every other vehicle has five units as one group, and the speed of the internal pump 3 of the group is made higher or lower than the internal pump speed of the other group, It is necessary to automatically control each variable frequency power supply 11 according to the core flow rate and avoid the rotation speed from the resonance region every other unit by using an MFG that can drive five units every other unit. It is possible to secure the core flow rate by automatic control.

[Sixteenth Embodiment (FIGS. 33 and 34)]
The sixteenth embodiment of the present invention is a specific internal pump in a boiling water nuclear reactor internal pump operation method having eight internal pumps 3 and a variable frequency power supply 11 capable of driving the internal pumps 3. 3 is operated at a higher speed or at a lower speed than the other internal pumps 3 and the individual variable frequency power supply devices 11 are automatically controlled according to the core flow rate.

  FIG. 33 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the sixteenth embodiment of the present invention, and FIG. 34 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the present embodiment, only the specific internal pump 3 is operated at a higher speed or at a lower speed than the other internal pumps 3 and the control of the individual variable frequency power supply devices 11 is automatically performed according to the core flow rate. By doing so, for example, only the internal pump 3 having a large vibration in the resonance region can avoid the resonance region and secure a necessary core flow rate by automatic control.

[17th Embodiment (FIGS. 35 and 36)]
The seventeenth embodiment of the present invention relates to a specific internal pump 3 in an internal pump operating method of a boiling water reactor having six internal pumps 3 and a variable frequency power supply 11 capable of driving the internal pumps. The operation is performed at a speed higher or lower than that of the other internal pumps 3 and the individual variable frequency power supply devices 11 are automatically controlled according to the core flow rate.

  FIG. 35 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the seventeenth embodiment of the present invention, and FIG. 36 shows an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. FIG. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the present embodiment, only the specific internal pump 3 is operated at a higher speed or at a lower speed than the other internal pumps 3 and the control of the individual variable frequency power supply devices 11 is automatically performed according to the core flow rate. By doing so, for example, only the internal pump 3 having a large vibration in the resonance region can avoid the resonance region and secure a necessary core flow rate by automatic control.

[Eighteenth Embodiment (FIGS. 37 and 38)]
In an eighteenth embodiment of the present invention, in a method for operating an internal pump of a boiling water reactor having four internal pumps 3 and a variable frequency power supply device 11 capable of driving the internal pump 3, a specific internal pump This is a method in which only 3 is set to be faster or slower than the other internal pumps 3 and each variable frequency power supply 11 is automatically controlled according to the core flow rate.

  FIG. 37 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to the present embodiment, and FIG. 38 is a plan layout view showing an example of the distribution of the pump speed of each internal pump 3 in the same embodiment. It is. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the present embodiment, only the specific internal pump 3 is operated at a higher speed or at a lower speed than the other internal pumps 3 and the control of the individual variable frequency power supply devices 11 is automatically performed according to the core flow rate. By doing so, for example, only the internal pump 3 having a large vibration in the resonance region can avoid the resonance region and secure a necessary core flow rate by automatic control.

[Nineteenth Embodiment (FIGS. 39 and 40)]
In the nineteenth embodiment of the present invention, in the internal pump operating method of the boiling water reactor having the internal pump 3 and the variable frequency power supply 11 capable of driving the internal pump 3, one or more internal pumps 3 are provided. When the operation is stopped, only the specific internal pump 3 is operated at a higher speed or at a lower speed than the other internal pumps 3 according to the core flow rate, and each variable frequency power supply device 11 is operated according to the core flow rate. Control is automatically performed.

  FIG. 39 is an explanatory view showing the equipment configuration for carrying out the internal pump operation method according to this embodiment, and FIG. 40 is a plan layout view showing an example of the distribution of pump speeds of each internal pump 3 in the same embodiment. It is. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the present embodiment, the internal pump 3 having a large vibration in the resonance region is stopped during partial unit operation in which one or more internal pumps 3 are stopped, and further, the resonance region is avoided with respect to the internal pump 3. While ensuring the necessary core flow. It is possible to operate by automatic control also by such a method.

[20th Embodiment (FIGS. 3 and 4)]
In the present embodiment, in the internal pump operating method of the boiling water reactor having the internal pump 3 and the variable frequency power supply device 11 capable of driving the internal pump, the internal motor in which the motor casing vibration has reached a certain value or more. When one or more pumps 3 are generated, an operation for automatically changing the rotational speed of the internal pump 3 to a region where vibration is reduced, and a variable frequency power supply device 11 of the internal pump 3 according to the operation method. A method for automatically performing the control will be described.

  FIG. 3 is a graph for explaining the operation of the present embodiment. The vertical axis represents the motor casing vibration speed, and the horizontal axis represents the pump speed. As shown in FIG. 3, the motor casing resonance area a1 exceeding the motor vibration great vibration threshold appears at a substantially intermediate speed of the pump speed. In FIG. 3, as an avoidance region for avoiding resonance, a constant region a2 having a vibration speed smaller than the motor vibration large vibration threshold value is set to a speed relative to the internal pump 3 exceeding the vibration large threshold value c. The pump speed area | region a2 after having decreased is illustrated. The pump speed of the specific internal pump 3 (“A”) is set in this low speed side pump speed region a2.

  FIG. 4 shows the speed of the other internal pumps 3 in order to avoid resonance and compensate the core flow rate after reducing the speed of the internal pump 3 exceeding the vibration threshold a1. The speed region a3 after increasing is illustrated. In order to compensate for the decrease in coolant flow rate, the pump speed of another specific internal pump 3 (“G”) is set in the pump speed region a2 on the high speed side. In addition, about the component similar to each said embodiment, a code | symbol same as the said embodiment is attached | subjected to a figure, and description is abbreviate | omitted.

  In the internal pump operation method of the boiling water reactor having the internal pump 3 and the variable frequency power supply device 11 that can drive the internal pump, the internal pump 3 having a motor casing vibration of a certain value or more is When one or more units are generated, the operation of automatically changing the rotation speed of the internal pump 3 to a region where vibration is reduced and the control of the variable frequency power supply device 11 of the internal pump 3 according to the operation method are performed. Do it automatically.

[Other Embodiments]
Boiling with 10 variable frequency power supply units that can drive 10 internal pumps one by one, and MG set upstream of variable frequency power supply units of 6 internal pumps in total 3 units In the water reactor internal pump operation method, the operation of stopping only a specific internal pump can be performed, and the individual variable frequency power supply devices can be automatically controlled according to the core flow rate.

  In addition, there are a total of 10 variable frequency power supply units that can drive 10 internal pumps one by one, and there is no MG set upstream of the internal pump variable frequency power supply unit. In the null pump operation method, the operation of stopping only a specific internal pump can be performed, and the control of each variable frequency power supply device can be automatically performed according to the core flow rate.

  Also, a boiling water nuclear reactor having two variable frequency power supply units each capable of driving two or three internal pumps together and having an MG set upstream of the three variable frequency power supply units In this internal pump operation method, only the specific internal pump is stopped, and each variable frequency power supply device can be automatically controlled according to the core flow rate.

  In addition, two internal variable frequency power supply units that can drive two or three internal pumps (reactor built-in type recirculation pumps) together, and upstream of the internal pump variable frequency power supply unit In the internal water pump operation method for boiling water reactors that do not have an MG set, the operation of stopping only a specific internal pump is performed, and the individual variable frequency power supply devices are automatically controlled according to the core flow rate. You can also.

  In addition, in the variable frequency power supply device having two MFGs (variable frequency power supply devices by MG set) that can drive 10 internal pumps in groups of 5 every other unit, 5 units are provided for every other unit. As a group, the operation of stopping one group of internal pumps can be performed, and the individual variable frequency power supply devices can be automatically controlled according to the core flow rate.

  In addition, in the internal pump operation method of a boiling water reactor having eight internal pumps and a variable frequency power supply device capable of driving the internal pumps, only a specific internal pump is stopped and the core flow rate is controlled. Accordingly, control of individual variable frequency power supply devices can be automatically performed.

  Moreover, in the internal pump operation method of a boiling water reactor having six internal pumps and a variable frequency power supply device that can drive the internal pumps, only a specific internal pump is set to be faster than other internal pumps. Alternatively, the operation at a low speed can be performed, and the individual variable frequency power supply devices can be automatically controlled according to the core flow rate.

  In addition, in the internal pump operation method for a boiling water reactor having six internal pumps and a variable frequency power supply device that can drive the internal pumps, only the specific internal pump is stopped and the core flow rate is controlled. Accordingly, control of individual variable frequency power supply devices can be automatically performed.

  In addition, in the internal pump operation method of a boiling water reactor having four internal pumps and a variable frequency power supply device that can drive the internal pumps, only a specific internal pump is stopped and the core flow rate is controlled. Accordingly, control of individual variable frequency power supply devices can be automatically performed.

  In addition, in the internal pump operation method of a boiling water reactor having an internal pump and a variable frequency power supply capable of driving the internal pump, the core flow rate during operation of one or more internal pumps in which one or more internal pumps are stopped. Accordingly, only a specific internal pump can be operated at a higher speed or a lower speed than other internal pumps, and individual variable frequency power supply devices can be automatically controlled according to the core flow rate.

BRIEF DESCRIPTION OF THE DRAWINGS Structure explanatory drawing which implements the method by 1st Embodiment of this invention. The pump layout for demonstrating the method by 1st Embodiment of this invention. The graph for demonstrating the effect | action of 1st Embodiment of this invention. The graph for demonstrating the effect | action of 1st Embodiment of this invention. Structure explanatory drawing which implements the method by 2nd Embodiment of this invention. The pump layout for demonstrating the method by 2nd Embodiment of this invention. FIG. 6 is an explanatory diagram of a configuration for carrying out a method according to a third embodiment of the present invention. The pump layout for demonstrating the method by 3rd Embodiment of this invention. Structure explanatory drawing which implements the method by 4th Embodiment of this invention. The pump layout for demonstrating the method by 4th Embodiment of this invention. Structure explanatory drawing which implements the method by 5th Embodiment of this invention. The pump layout for demonstrating the method by 5th Embodiment of this invention. Structure explanatory drawing which implements the method by 6th Embodiment of this invention. The pump layout for demonstrating the method by 6th Embodiment of this invention. Structure explanatory drawing which implements the method by 7th Embodiment of this invention. The pump layout for demonstrating the method by 7th Embodiment of this invention. Structure explanatory drawing which implements the method by 8th Embodiment of this invention. The pump layout for demonstrating the method by 8th Embodiment of this invention. Structure explanatory drawing which implements the method by 9th Embodiment of this invention. The pump layout for demonstrating the method by 9th Embodiment of this invention. Structure explanatory drawing which implements the method by 10th Embodiment of this invention. The pump layout for demonstrating the method by 10th Embodiment of this invention. Structure explanatory drawing which implements the method by 11th Embodiment of this invention. The pump layout for demonstrating the method by 11th Embodiment of this invention. The structure explanatory view which enforces the method by a 12th embodiment of the present invention. The pump layout for demonstrating the method by 12th Embodiment of this invention. Structure explanatory drawing which implements the method by 13th Embodiment of this invention. The pump layout for demonstrating the method by 13th Embodiment of this invention. Structure explanatory drawing which implements the method by 14th Embodiment of this invention. The pump layout for demonstrating the method by 14th Embodiment of this invention. Structure explanatory drawing which implements the method by 15th Embodiment of this invention. The pump layout for demonstrating the method by 15th Embodiment of this invention. Explanatory drawing which implements the method by 16th Embodiment of this invention. The pump layout for demonstrating the method by 16th Embodiment of this invention. Structure explanatory drawing which implements the method by 17th Embodiment of this invention. The pump layout for demonstrating the method by 17th Embodiment of this invention. Structure explanatory drawing which implements the method by 18th Embodiment of this invention. The pump layout for demonstrating the method by 18th Embodiment of this invention. Structure explanatory drawing which implements the method by 19th Embodiment of this invention. The pump layout for demonstrating the method by 19th Embodiment of this invention. The graph for demonstrating a prior art example.

Explanation of symbols

1 Reactor pressure vessel 2 Core 4 Main transformer 3 Internal pump (reactor built-in recirculation pump: RIP) “A, B, C, D, E, F, G, H, J, K”
5 Generator 6 Load switch 7 Directly connected transformer 8 Power receiving breaker 9 Power receiving breaker 10 Input transformer 11 Variable frequency power supply (ASD)
12 Switch 13 MG set 14 Power receiving breaker

Claims (11)

In the internal pump operation method in which the internal pump of a boiling water reactor is driven by a variable frequency power supply, only a specific internal pump is operated at a higher speed or lower speed than other internal pumps, and depending on the core flow rate And an internal pump operation method for a boiling water reactor, wherein the operation is performed to automatically control individual variable frequency power supply devices. In the internal pump operation method in which the internal pump of a boiling water reactor is driven by a variable frequency power supply, the operation to stop only a specific internal pump and the individual variable frequency power supply are automatically controlled according to the core flow rate. A method for operating an internal pump of a boiling water reactor, characterized in that: Internal pump operation in which 10 internal pumps of boiling water reactors are driven by individually corresponding variable frequency power supply units, and power supply is maintained by MG sets for a total of 6 variable frequency power supply units. In the method, the variable frequency power supply devices are grouped into those having the MG set and those having no MG set, and an internal pump of a group driven by the variable frequency power supply device not having the MG set has the MG set. Boiling water characterized by performing an operation at a higher speed or a lower speed than an internal pump of a group driven by the variable frequency power supply device and an operation of automatically controlling each variable frequency power supply device in accordance with a core flow rate. Operation method of internal pump of type reactor. Internal pump operation in which 10 internal pumps of boiling water reactors are driven by individually corresponding variable frequency power supply units, and power supply is maintained by MG sets for a total of 6 variable frequency power supply units. In the method, an internal pump connected to the MG set and an internal pump not connected to the MG set are grouped, and an internal pump belonging to one group is grouped with an internal pump belonging to the other group. The speed of the internal pumps in the group, with only a specific internal pump set to be faster or slower than other internal pumps, or 5 units in a group as a group Faster than the other group of internal pumps or And operation for a fast, internal pumps operating method of a boiling water nuclear reactor and performing the operation for automatically controlling the individual variable frequency power supply in accordance with the core flow. While each of the 10 boiling water reactor internal pumps is individually driven by a variable frequency power supply, the internal pump operation method that does not maintain the power supply by the MG set is limited to a specific internal pump. Or higher speed than the internal pump of the other group, or every 5 units in one group, and the internal pump of that group is faster or slower than the internal pump of the other group And an internal pump operation method for a boiling water reactor, characterized in that an operation for automatically controlling individual variable frequency power supply devices according to the core flow rate is performed. 10 internal pumps are driven by 2 variable frequency power supply units for 2 units that can be driven together and 2 variable frequency power supply units for 3 units that can be driven collectively, and 3 units in total. In the internal pump operation method in which power supply is maintained for the six variable frequency power supply devices by the MG set, the internal pump is not provided with the group of three variable frequency power supply devices having the MG set and the MG set. The internal pump driven by the two variable frequency power supply devices is divided into a group with the variable frequency power supply device for the table, and is faster or slower than the internal pump driven by the three variable frequency power supply devices. Operation, 2 internal pumps connected under 1 MG set and 3 internal pumps without MG set As a group, with the internal pump of that group running faster or slower than the other group's internal pump, or with only a specific internal pump running faster or slower than other internal pumps And an internal pump operation method for a boiling water reactor, characterized in that an operation for automatically controlling individual variable frequency power supply devices according to the core flow rate is performed. The 10 internal pumps are driven by two sets of two variable frequency power supply devices that can be driven together and two sets of three variable frequency power supply devices that can be driven collectively, while the variable frequency power supply In the internal pump operation method that does not have an MG set upstream of the device, only a specific internal pump is operated at a higher speed or a lower speed than other internal pumps, or stopped, and individually according to the core flow rate. A method for operating an internal pump of a boiling water reactor, characterized by performing an operation of automatically controlling a variable frequency power supply apparatus of the above. In the internal pump operation method in which 10 internal pumps are driven by a variable frequency power supply device having two MFGs (variable frequency power supply devices by MG set) capable of driving 5 units at a time every other unit. Divide the pumps into two groups of 5 units every other unit, and operate the internal pump speed of one group higher or lower than the internal pump of the other group, and individual variable frequency power supply according to the core flow rate A method for operating an internal pump of a boiling water reactor, characterized by performing an operation for automatically controlling the apparatus. In the internal pump operation method that uses 10 variable frequency power supply devices that can drive 10 internal pumps one by one, but does not have an MG set upstream of the variable frequency power supply device of the internal pump. An internal pump operation method for a boiling water reactor, characterized in that an operation for stopping only the internal pump of the reactor and an operation for automatically controlling each variable frequency power supply device according to the operation method and the core flow rate are performed. . 10 internal pumps are driven by two sets of two variable frequency power supply devices that can be driven together and two sets of three variable frequency power supply devices that can be driven collectively, and for the three sets In the internal pump operation method having the MG set upstream of the variable frequency power supply device, the operation for stopping only a specific internal pump, the operation for stopping only a specific internal pump, or one unit for every 5 units. As a group, an operation for stopping one group of internal pumps, and an operation for automatically controlling individual variable frequency power supply devices according to the operation method and the core flow rate are performed. Internal pump operation method. The internal pump operation method according to any one of claims 1 to 10, wherein when one or more internal pumps having a motor casing vibration with a certain value or more are generated, When one or more internal pumps that automatically change the rotation speed to a region where vibration is reduced or one or more internal pumps with motor casing vibration exceeds a certain value are generated, the rotation speed of the internal pump Boiling water that automatically changes to the area to be reduced and changes the rotational speed of other internal pumps according to the core flow rate and automatically controls each variable frequency power supply unit according to the core flow rate Operation method of internal pump of type reactor.

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