JP2003035790A - Reflector controlling reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflector controlling reactor of which the neutron reflector can smoothly move up and down in a moving region. SOLUTION: A projection part 22 extending in horizontal direction along side 21a and 21b of the neutron reflector 21 moving up and down inside the moving region 8 is projected and a coolant flow path 23 between the inner wall of the moving region 8 and the neutron reflector 21 is narrowed. As fluid force such as fluid resistance, fluid pressure and viscosity force strongly work, the neutron reflector 21 smoothly moves up and down in the moving region 8 without vibrating to up and down direction, back and forth direction and left and right direction. Also, since the inclination of the neutron reflector 21 inside the moving region 8 can be made small, the neutron reflector 21 does not catch on the inner wall of the moving region 8 when guided by a slide on the end surface 22a of the projection part 22 and the inner wall surface, and can smoothly move up and down inside the moving region 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention adjusts the leakage of neutrons from the core by vertically moving a neutron reflector arranged around the core immersed in a coolant within a moving region. Reflector control reactor for controlling the reactivity of

[0002]

2. Description of the Related Art Conventionally, in a reflector control reactor, a neutron reflector disposed around a core immersed in a coolant is vertically moved within a moving region to cause leakage of neutrons from the core. Is adjusted to control the reactivity of the core, and a general structure thereof will be described with reference to FIGS. 29 to 32.

In the reflector control reactor 1 shown in FIG. 29, an annular neutron reflector 4 and a ring-shaped neutron reflector 4 are provided around a core 3 located at the center of a reactor vessel 2 filled with liquid sodium as a coolant. The neutron shield 5 is arranged concentrically. The neutron reflector 4 includes a core barrel 6 and a partition wall 7.
It is possible to move up and down inside the annular moving area 8 formed by.

On the other hand, the liquid sodium discharged downward from the electromagnetic pump 9 arranged in the upper part of the reactor vessel 2 is
After passing through the periphery of the neutron shield 5 and flowing down to the lower plenum 10, it is heated to a high temperature when rising in the assembly region 11 including the core 3, and rises to the upper plenum 12.
The hot liquid sodium in the upper plenum 12
After being guided to a heat exchanger (not shown) to remove the heat, it returns to the suction side of the electromagnetic pump 9.

The neutron reflector 4 moves up and down in the moving area 8 by the balance of the fluid force (fluid pressure, fluid resistance, viscous force) and buoyancy received from the liquid sodium flowing upward in the moving area 8. To do. When the discharge pressure of the electromagnetic pump 9 rises, the fluid force received from the liquid sodium increases, so that the neutron reflector 4 rises inside the moving region 8.

The neutron reflector 4 that has moved upward in the moving region 8 is held by the drive mechanism 13 adsorbed on the surface of the core barrel 6 as shown in FIG. When the neutron reflector 4 is held around the core 3, the neutrons emitted by the nuclear fission in the core 3 are reflected by the neutron reflector 4 toward the core 3, so that the nuclear fission is continued in a chain and the reflector The output of the control reactor 1 can be maintained.

On the other hand, when the electromagnetic pump 9 is stopped and the circulation of the liquid sodium is lost, the fluid force received by the neutron reflector 4 from the liquid sodium disappears and the gravitational force acting on the neutron reflector 4 prevails. The neutron reflector 4 descends inside the liquid movement region 8. When the neutron reflector 4 descends inside the liquid transfer region 8 and is located below the core 3,
Since the neutrons emitted from the core 3 are absorbed by the neutron shield 5, the operation of the reflector control reactor 1 is stopped.

[0008]

By the way, in the conventional reflector control reactor 1 described above, FIG. 31 and FIG.
As shown in FIG. 2, the neutron reflector 4 is divided into a plurality of parts in the circumferential direction.

As a result, the neutron reflector 4 moves in the moving region 8
When the neutron reflector 4 tilts while moving up and down inside the neutron reflector 4, the corner portions of the upper end or the lower end rub against the surfaces of the core barrel 6 and the partition wall 7, so that the neutron reflector 4 smoothly moves up and down inside the moving region 8. There were cases where it did not move.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a reflector control reactor in which a neutron reflector can smoothly move up and down inside a moving region.

[0011]

According to the means for solving the above-mentioned problems, the neutron reflector arranged around the core immersed in the coolant moves up and down within the moving region. In the reflector control reactor to control the reactivity of the core by adjusting the leakage of neutrons from the core, the neutron reflector, the inner wall surface protruding from the side surface toward the inner wall surface of the moving region And a projection portion that narrows the flow path of the coolant between the side surface and the side surface.

That is, when the neutron reflector moves up and down inside the moving area filled with the coolant, the gap between the inner wall surface of the moving area and the side surface of the neutron reflector forms the flow path of the coolant. Become. At this time, since the projection provided on the neutron reflector narrows the flow path, the projection receives the fluid resistance such as the fluid resistance, the fluid pressure, and the viscous force received from the coolant. Thereby, the neutron reflector can smoothly move up and down (float or sink) inside the moving region without vibrating in the up-down direction and the front-back, left-right direction. Also,
Since the gap between the inner wall surface of the moving region and the tip of the protruding portion is narrow, the amount of inclination of the neutron reflector inside the moving region is smaller than in the case where the protruding portion is not provided. As a result, the neutron reflector smoothly guides the inside of the moving region while being guided by the sliding between the inner wall surface of the moving region and the tip surface of the protrusion without the corners being caught on the inner wall surface of the moving region. Can move up and down. Furthermore, in order to narrow the gap between the inner wall surface of the moving region, only the tip of the protrusion needs to be processed with high accuracy, so compared with the case of processing the entire side surface of the neutron reflector The manufacturing cost can be significantly reduced.

According to a second aspect of the present invention, in the reflector-controlled nuclear reactor according to the first aspect, the protrusion extends horizontally continuously along a side surface of the neutron reflector. To do.

That is, when the protrusion is arranged so as to extend in the horizontal direction, the direction in which the protrusion extends and the direction in which the coolant flows are perpendicular to each other. Therefore, the fluid pressure, the fluid resistance, and the viscous force received from the coolant are applied to the protrusion. The fluid force such as acts remarkably. As a result, the neutron reflector can smoothly move up and down inside the moving region without vibrating in the vertical direction and the front-back, left-right direction. It should be noted that one protrusion may be provided only on the upper end or the lower end of the neutron reflector, or a plurality of protrusions extending parallel to each other may be provided dispersed over the entire side surface of the neutron reflector.

According to a third aspect of the present invention, in the reflector-controlled nuclear reactor according to the first aspect, the protrusion extends in the vertical direction along the side surface of the neutron reflector.

That is, when the protrusion is arranged so as to extend in the vertical direction, the direction in which the protrusion extends and the direction in which the coolant flows coincide with each other, so that the flow direction of the coolant can be restricted and the viscous force of the coolant can be suppressed. The protrusion can be greatly affected. As a result, the neutron reflector can smoothly move up and down inside the moving region without vibrating in the up-down direction or the front-back, left-right direction. In addition, it is preferable that the plurality of protrusions extending in parallel to each other are dispersed and disposed on the entire side surface of the neutron reflector.

The means according to claim 4 adjusts the leakage of neutrons from the core by vertically moving a neutron reflector arranged around the core immersed in the coolant within a moving region. In the reflector-controlled nuclear reactor for controlling the reactivity of the core, the neutron reflector has a portion having a lower density than the other portions at the upper end thereof.

That is, when a portion having a low density is provided at the upper end of the neutron reflector, a larger buoyancy acts on the upper end of the neutron reflector than at other portions. This makes it possible to stabilize the posture of the neutron reflector when it moves up and down in the moving region and prevent its inclination, so that the neutron reflector causes vibration due to being caught on the inner wall surface of the moving region or disturbing the posture. It is possible to move up and down smoothly inside the moving area without moving. In addition, in order to form a portion having a low density, a hollow portion may be provided at the upper end portion of the neutron reflector, or a member having a density lower than that of other portions may be filled.

According to a fifth aspect of the present invention, which solves the above-mentioned problems, the neutron reflector disposed around the core immersed in the coolant is moved up and down within the moving region to remove the neutron reflector from the core. In the reflector-controlled nuclear reactor that adjusts the leakage of neutrons to control the reactivity of the core, the neutron reflector has a portion having a higher density than other portions at its lower end portion.

That is, when a portion having a high density is provided at the lower end of the neutron reflector, the gravitational force acting on the lower end of the neutron reflector is larger than that of the other portions. This makes it possible to stabilize the posture of the neutron reflector when it moves up and down in the moving region and prevent its inclination, so that the neutron reflector causes vibration due to being caught on the inner wall surface of the moving region or disturbing the posture. It is possible to move up and down smoothly inside the moving area without moving. In addition, in order to form a high-density portion, the lower end portion of the neutron reflector can be filled with a member having a higher density than other portions such as a weight.

The means according to claim 6 adjusts the leakage of neutrons from the core by vertically moving a neutron reflector arranged around the core immersed in a coolant within a moving region. In a reflector control reactor for controlling the reactivity of the core, the neutron reflector can move up and down in the through flow passage and a through flow passage that extends through the coolant in the vertical direction. And a movable member.

That is, the pressure fluctuation (pulsation) of the coolant pumped upward from the lower part of the moving region causes energy consumption and fluid resistance generated when the coolant vertically moves the movable member in the through passage. Can be absorbed by etc. With this, it is possible to prevent the neutron reflector from vertically vibrating due to the pressure fluctuation of the coolant, and to smoothly move the neutron reflector up and down inside the moving region.
It is also possible to further increase the pulsation damping effect by providing the throttle portions at the inlet and the outlet of the through-flow passage so that a pressure loss occurs when the coolant passes through these throttle portions.

The means according to claim 7 adjusts the leakage of neutrons from the core by vertically moving a neutron reflector arranged around the core immersed in a coolant within a moving region. In the reflector control reactor to control the reactivity of the core, the neutron reflector guides the vertical movement of the neutron reflector by rolling on the inner wall surface of the moving region, to the neutron reflector. It is characterized in that it is provided with a guide wheel that is rotatably supported.

That is, since there is a gap that serves as a coolant flow path between the inner wall surface of the moving region and the side surface of the neutron reflector, the neutron reflector tilts when moving up and down inside the moving region. May get caught on the inner wall surface. At this time, the guide wheel rotatably supported on the neutron reflector rolls on the inner wall surface, so that the inclination of the neutron reflector and the contact between the neutron reflector and the inner wall surface and the front-rear, left-right direction of the neutron reflector Since the vibration can be prevented, the neutron reflector can be smoothly moved up and down inside the moving region. Further, it is possible to prevent the neutron reflector from vertically vibrating due to the frictional force generated when the guide wheel rotates. The guide wheels are preferably provided at the upper and lower ends of the neutron reflector in order to minimize the inclination of the neutron reflector.

The means according to claim 8 adjusts the leakage of neutrons from the core by vertically moving a neutron reflector disposed around the core immersed in a coolant within a moving region. In the reflector control reactor for controlling the reactivity of the core, the neutron reflector, an inlet for receiving the coolant by opening at the lower end of the neutron reflector, and an opening on the side surface of the neutron reflector. And a discharge port that discharges the coolant received from the reception port toward the inner wall surface, and a through channel that extends through the neutron reflector between the reception port and the discharge port. It is characterized by

That is, when the neutron reflector rises inside the moving region by the coolant pumped upward from the lower part of the moving region and when the neutron reflector descends inside the moving region, the neutron reflector While the coolant below is flowing into the through channel through the receiving port,
It is discharged from the discharge port toward the inner wall surface of the moving area. Thereby, the coolant is supplied into the gap between the inner wall surface of the moving region and the side surface of the neutron reflector, and the contact between the inner wall surface of the moving region and the neutron reflector can be prevented, so that the neutron reflector is moved. It can be moved up and down smoothly inside the area.

The means according to claim 9 adjusts the leakage of neutrons from the core by vertically moving a neutron reflector disposed around the core immersed in a coolant within a moving region. A reactor control reactor for controlling the reactivity of the core, comprising a guide shaft that is inserted into a through hole that vertically penetrates the neutron reflector and guides the vertical movement of the neutron reflector. Is characterized by.

That is, since the neutron reflector can be moved up and down while being guided by the guide shaft, contact between the inner wall surface of the movement region and the neutron reflector is prevented, and the neutron reflector is moved. It can be moved up and down smoothly inside the area.

The means according to claim 10 adjusts the leakage of neutrons from the core by vertically moving a neutron reflector arranged around the core immersed in a coolant within a moving region. In the reactor control reactor for controlling the reactivity of the core, the neutron reflector is divided into a plurality of parts in which the gap between the inner wall surface of the moving region and the inner wall is narrower in the vertical direction. It is characterized by being

That is, among the plurality of parts obtained by dividing the neutron reflector in the vertical direction, the gap between the upper part and the inner wall surface of the moving region is narrower, so that the pump is pumped upward from the lower part of the moving region. The fluid force received from the applied coolant is greater in the upper part. Thereby, when the coolant is pumped by pumping to raise the neutron reflector, by controlling the flow rate of the coolant pumped by the pump, among each part of the neutron reflector divided into a plurality of vertically It is possible to control how many items are raised from the top. Further, when the neutron reflector descends inside the moving region, the fluid resistance received from the coolant is smaller toward the lower part. Accordingly, when the supply of the coolant by pumping is stopped to lower the neutron reflector, the lower the neutron reflector is, the easier it is to lower, so that the entire neutron reflector can be smoothly lowered. Furthermore, each part of the neutron reflector divided into a plurality of parts in the vertical direction is smaller in the vertical direction than the integrally formed neutron reflector, so even if it is tilted inside the moving region, The amount of displacement is small and it is difficult to contact the inner wall surface of the moving area. As a result, the entire neutron reflector can be smoothly moved up and down inside the moving region.

According to the eleventh aspect of the present invention, the leakage of neutrons from the core is adjusted by vertically moving a neutron reflector disposed around the core immersed in the coolant within the moving region. In the reflector control reactor for controlling the reactivity of the reactor core, the cross-sectional shape of the moving region cut along a vertical plane is a shape that widens from the lower side to the upper side.

That is, the gap between the inner wall surface of the moving region and the side surface of the neutron reflector becomes wider as it goes upward. As a result, the magnitude of the fluid force that the neutron reflector receives from the coolant pumped upward from the lower part of the moving region gradually decreases as the neutron reflector moves upward inside the moving region. Therefore, by controlling the flow rate of the coolant pumped upward from the lower part of the moving region, the vertical position of the neutron reflector inside the moving region is continuously controlled, and the reactor power is continuously changed. Can be controlled.

According to a twelfth aspect of the present invention, the neutron reflector disposed around the core immersed in the coolant is vertically moved within the moving region to adjust the leakage of neutrons from the core. In the reflector control reactor for controlling the reactivity of the reactor core, the cross-sectional shape when the moving region is cut along a vertical plane is characterized in that the shape gradually increases from the lower side to the upper side. .

That is, the gap between the inner wall surface of the moving region and the side surface of the neutron reflector becomes wider stepwise as it goes upward. As a result, the magnitude of the fluid force that the neutron reflector receives from the coolant pumped upward from the lower part of the moving region gradually decreases as the neutron reflector moves upward inside the moving region. . Therefore, by controlling the flow rate of the coolant pumped upward from the lower part of the moving region, the vertical position of the neutron reflector inside the moving region is controlled stepwise, and the reactor power is gradually changed. Can be controlled. Moreover, since the gap between the inner wall surface of the moving region and the side surface of the neutron reflector becomes gradually wider as it goes upward, the neutron reflector does not come into contact with the inner wall surface, and the neutron reflector is smoothly moved up and down. Can be moved.

The means according to the thirteenth aspect adjusts the leakage of neutrons from the core by vertically moving a neutron reflector disposed around the core immersed in the coolant within a moving region. Is a reflector control reactor for controlling the reactivity of the core, an electromagnet disposed around the neutron reflector that vertically displaces the neutron reflector by magnetic force, and driving the electromagnet. And an electromagnet driving mechanism for vertically displacing.

That is, by changing the vertical position of the electromagnet using the electromagnet driving mechanism, the neutron reflector can be moved up and down within the moving region without vibrating in the vertical direction. In addition, the neutron reflector can be lowered in accordance with the stop of the pump by interlocking with the stop of the pump that pumps the coolant upward from the lower part of the moving region and cutting off the power supply to the electromagnet.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a reflector control reactor according to the present invention will be described in detail with reference to FIGS. 1 to 28. In the following description, the same reference numerals are used for the same parts, and the vertical direction is the vertical direction,
The radial direction with respect to the core is called the front-back direction, and the circumferential direction with respect to the core is called the left-right direction.

First Embodiment First, the reflector control reactor of the first embodiment and its modification will be described in detail with reference to FIGS.

The structure and operation of the reflector control reactor of the first embodiment are similar to those of the conventional reflector control reactor shown in FIGS. 29 to 32 except that the shape of the neutron reflector is partly different. It has the same structure and operation. Therefore, the difference in the shape of the neutron reflector and its effect will be described in detail.

As shown in FIGS. 1 to 4, the neutron reflector 21 used in the reflector control reactor 20 of the first embodiment.
Is attached to each of the side surfaces 21a, 21
It is provided with a pair of upper and lower protrusions 22 that extend horizontally horizontally along b, 21c, and 21d. Then, these projecting portions 22 project toward the inner wall surfaces of the core barrel 6 and the partition wall 7 forming the moving region 8 and form the coolant flow passage 23 between these inner wall surfaces and the pair of front and rear side surfaces 21a, 21d. The narrow spaces 24 to be narrowed are formed respectively.

As a result, when the neutron reflector 21 moves up and down inside the moving region 8, a pair of upper and lower protrusions 22 are provided.
Since a fluid force such as a fluid resistance, a fluid pressure, and a fluid viscous force acts on the neutron reflector 21, the neutron reflector 21 can smoothly move up and down inside the moving region 8 without vibrating in the up-down direction and the front-back and left-right directions.

Further, each inner wall surface of the moving area 8 and the protruding portion 22.
Since the gap between the tip 22a and the tip 22a is narrow, the amount of inclination of the neutron reflector 21 inside the moving region 8 can be reduced as compared with the case where the protrusion 22 is not provided. As a result, when the neutron reflector 21 moves up and down inside the moving region 8, the neutron reflector 21 is largely inclined, and its end does not get caught on the inner wall surface of the moving region 8. Also,
Since the tip end surface 22a of the protrusion 22 slides on the inner wall surface of the moving region 8 to guide the vertical movement of the neutron reflector 21, the neutron reflector 21 can smoothly move up and down inside the moving region 8. .

The protrusion 2 is formed on the side surface of the neutron reflector 21.
In order to reduce the inclination amount of the neutron reflector 21 in the moving region 8 without providing 2, the entire side surfaces 21a and 21b of the neutron reflector 21 are finished with high dimensional accuracy to form an inner wall surface of the moving region 8. It is necessary to narrow the gap between them, which increases the manufacturing cost of the neutron reflector 21. At this time, in the neutron reflector 21 of the first embodiment,
Since only the tip surface 22a of the protrusion 22 needs to be processed with high accuracy, the manufacturing cost of the neutron reflector 21 can be significantly reduced.

In the modification shown in FIG. 5, the protrusion 2
The upper and lower surfaces of 2 are inclined surfaces 22b. Further, in the modification shown in FIG. 6, a chamfer 22c is applied to the tip corner portion of the protrusion 22. Furthermore, in the modification shown in FIG. 7, the tip of the protrusion 22 is rounded by the curved surface 22d. As described above, by appropriately setting the cross-sectional shape of the protrusion 22, the flow condition of the coolant flowing around the tip of the protrusion 22 can be controlled.
It is possible to freely control the magnitude of fluid force such as fluid resistance and fluid pressure acting on the protruding portion 22.

In the modification shown in FIG. 8, the protrusion 2
A plurality of recessed grooves 25 are provided in the front end surface 22a of the second member 2 while being inclined with respect to the vertical direction. This makes it possible to control the flow condition of the coolant flowing around the tip of the protrusion 22 and freely control the magnitude of the fluid resistance acting on the protrusion 22 and the fluid force such as the fluid pressure. The groove 25
The number, depth, inclination, etc. can be changed as necessary.

In the modification shown in FIG. 9, the protrusion 22 is provided only on the upper end of the neutron reflector 21. Thereby, when the neutron reflector 21 moves up and down inside the moving region 8, the fluid force acting on the protrusion 22 acts upward on the upper end portion of the neutron reflector 21. Therefore, since the posture of the neutron reflector 21 can be stabilized and the inclination can be prevented, the neutron reflector 21 does not get caught on the inner wall surface of the moving region 8 or vibrates due to the disorder of the posture, and the neutron reflector 21 is not generated. 21 can be smoothly moved up and down inside the moving area 8.

In the modification shown in FIG. 10, a plurality of protrusions 22 extending horizontally in parallel to each other are arranged in the vertical direction over the entire side surface of the neutron reflector 21. Thereby, the total sum of the fluid forces of the coolant acting on each protrusion 22 is significantly increased as compared with the case where only one protrusion 22 is provided. Therefore, it is possible to more reliably prevent the neutron reflector 21 from vibrating in the up-down direction and the front-rear, left-right direction, and move the neutron reflector 21 up and down more smoothly in the moving region 8.

In the modification shown in FIG. 11, both side surfaces 21 of the neutron reflector 21 facing the inner wall surface of the moving region 8 are arranged.
A pair of front and rear guide surfaces 26 are formed at the lower end portions of a and 21b. That is, when the neutron reflector 21 descends inside the moving region 8, the coolant is guided by the guide surface 26 and the inner wall surface of the moving region 8 and the neutron reflector 2 are guided.
The turbulent flow of the coolant does not occur around the lower end of the neutron reflector 21 because it smoothly flows into the gap between the side surfaces 21a and 21b of the first neutron reflector 21. Thereby, the neutron reflector 21 does not vibrate in the front-rear direction and the left-right direction,
The inside of the moving area 8 can be smoothly lowered.

On the other hand, in the modification shown in FIG.
The guide surface 26 is formed only on the lower end of the one side surface 21b of the neutron reflector 21. As a result, when the neutron reflector 21 descends inside the moving region 8, the moving region 8
The neutron reflector 21 can be pressed toward the inner wall surface of the core barrel 6 that forms the. That is, the guide surface 26
By appropriately setting the position, size, shape, etc. at which the neutron is provided, the attitude of the neutron reflector 21 that descends inside the moving region 8 can be freely controlled.

Second Embodiment Next, a reflector control reactor of the second embodiment will be described with reference to FIG.

The structure and operation of the reflector control reactor of the second embodiment are the same as those of the conventional reflector control reactor shown in FIGS. 29 to 32 except that the shape of the neutron reflector is partly different. It has the same structure and operation. Therefore, the difference in the shape of the neutron reflector and its effect will be described in detail.

As shown in FIG. 13, the neutron reflector 31 used in the reflector control nuclear reactor 30 of the second embodiment is parallel to each other along the side faces 31a, 31b, 31c, 31d and is continuous. Then, a plurality of protrusions 32 extending in the vertical direction are provided.

At this time, since the extending direction of each protrusion 32 and the flowing direction of the coolant coincide with each other, the flow direction of the coolant can be restricted and the viscous force of the coolant can be applied to each protrusion 32.
Can be greatly affected. As a result, the neutron reflector 31 can smoothly move up and down inside the moving region 8 without vibrating in the vertical direction or the front-back, left-right direction.

Third Embodiment Next, with reference to FIGS. 14 and 15, a reflector control nuclear reactor of the third embodiment and a modification thereof will be described.

The structure and operation of the reflector control reactor of the third embodiment are the same as those of the conventional reflector control reactor shown in FIGS. 29 to 32 except that the shape of the neutron reflector is partly different. It has the same structure and operation. Therefore, the difference in the shape of the neutron reflector and its effect will be described in detail.

As shown in FIG. 14, the neutron reflector 41 used in the reflector control nuclear reactor 40 of the third embodiment has a hollow portion 42 at its upper end.

That is, when the hollow portion 42 having a low density is provided at the upper end portion of the neutron reflector 41, a larger buoyancy acts on the upper end portion of the neutron reflector 41 than at other portions. Therefore, since the posture of the neutron reflector 41 can be stabilized and the inclination can be prevented, the neutron reflector 41 is not caught on the inner wall surface of the moving region 8 or the vibration due to the disorder of the posture does not occur, The neutron reflector 41 can be smoothly moved up and down inside the moving region 8. In addition, in order to form a portion having a low density, a hollow portion 42 may be provided at the upper end of the neutron reflector 41, and a member having a density lower than that of other portions may be filled.

On the other hand, in the modification shown in FIG. 15, the neutron reflector 41 has a weight 43 at the lower end thereof.

That is, when the weight 43 is filled in the lower end portion of the neutron reflector 41 to form a portion having a higher density than the other portions, the lower end portion of the neutron reflector 41 has a larger gravity than the other portions. To work. Therefore, since the posture of the neutron reflector 41 can be stabilized and the inclination can be prevented, the neutron reflector 41 is not caught on the inner wall surface of the moving region 8 or the vibration due to the disorder of the posture does not occur, The neutron reflector 41 can be smoothly moved up and down inside the moving region 8.

Fourth Embodiment Next, with reference to FIGS. 16 and 17, a reflector control reactor of the fourth embodiment and a modification thereof will be described.

The structure and operation of the reflector control reactor of the fourth embodiment are the same as those of the conventional reflector control reactor shown in FIGS. 29 to 32 except that the shape of the neutron reflector is partly different. It has the same structure and operation. Therefore, the difference in the shape of the neutron reflector and its effect will be described in detail.

As shown in FIG. 16, the neutron reflector 51 used in the reflector control reactor 50 of the fourth embodiment has a through channel 52 penetrating in the vertical direction and an upper end portion of the through channel 52. And the narrowed portions 53 disposed at the lower end,
54, and a movable member 55 made of a spherical metal that can move up and down in the through channel 52.

That is, in the neutron reflector 51 used in the reflector control reactor 50 of the fourth embodiment, the pressure fluctuation (pulsation) of the coolant pumped upward from the lower part of the moving region 8 is cooled. When the material enters and exits the through channel 52 of the neutron reflector 51, the throttle portions 53, 54
Can be eliminated by the pressure loss received at, the energy consumption and the fluid resistance when the coolant moves the movable member 55 up and down. As a result, it is possible to prevent the neutron reflector 51 from vertically vibrating due to the pressure fluctuation of the coolant, and to move the neutron reflector 51 smoothly up and down in the moving region 8.

On the other hand, in the modification shown in FIG.
The through channel 56 that penetrates the inside of the neutron reflector 51 in the up-down direction has a cross-sectional shape when it is cut along the vertical plane such that it expands upward.

That is, as the pressure fluctuation of the coolant increases, the movable member 55 moves to the upper part of the through passage 56. At this time, in this modification, the inner wall surface of the through channel 56 penetrating the neutron reflector 51 and the movable member 5 are
The size of the gap between the surface of No. 5 and the surface of No. 5 becomes wider as it goes up. As a result, the fluid force of the coolant acting on the movable member 55 decreases as the movable member 55 moves to the upper part of the through channel 56, so that the movable member 55 rises to the uppermost part of the through channel 56. It is possible to reliably prevent the upper opening 53 of the through flow path 56 from being closed. Therefore, even when the pressure fluctuation of the coolant is large, the movable member 55 can be reliably vibrated in the vertical direction to eliminate the pressure fluctuation of the coolant.

Fifth Embodiment Next, a reflector control reactor of the fifth embodiment will be described with reference to FIG.

The structure and operation of the reflector control reactor of the fifth embodiment are similar to those of the conventional reflector control reactor shown in FIGS. 29 to 32 except that the shape of the neutron reflector is partly different. It has the same structure and operation. Therefore, the difference in the shape of the neutron reflector and its effect will be described in detail.

As shown in FIG. 18, the neutron reflector 61 used in the reflector control reactor 60 of the fifth embodiment rolls on the inner wall surface of the moving region 8 to move the neutron reflector 61 up and down. Guide the neutron reflector 61 to the side surfaces 61a, 6
1b includes a plurality of guide wheels 62 that are rotatably supported.
have.

That is, the guide wheel 62 rotatably supported by the neutron reflector 61 rolls on the inner wall surface of the moving region 8 so that the inclination of the neutron reflector 61 and the neutron reflector 61 and the inner wall surface The contact and vibration of the neutron reflector 61 in the front-rear direction and the left-right direction can be prevented. Further, it is possible to prevent the neutron reflector 61 from vertically vibrating due to a frictional force generated when the guide wheel 62 rotates around a shaft (not shown). Thereby, the neutron reflector 61 can be smoothly moved up and down within the moving region 8.

Sixth Embodiment Next, with reference to FIGS. 19 and 20, a reflector control reactor of the sixth embodiment and a modification thereof will be described.

The structure and operation of the reflector control reactor of the sixth embodiment are the same as those of the conventional reflector control reactor shown in FIGS. 29 to 32 except that the shape of the neutron reflector is partly different. It has the same structure and operation. Therefore, the difference in the shape of the neutron reflector and its effect will be described in detail.

As shown in FIG. 19, the neutron reflector 71 used in the reflector-controlled nuclear reactor 70 of the sixth embodiment has an inlet 72 for opening the lower end thereof to receive a coolant,
A discharge port 73 that opens into the side surfaces 71a and 71b of the neutron reflector 71 and discharges the coolant received from the receiving port 72 toward the inner wall surface of the moving region 8, and the receiving port 72 and the discharging port 73.
Through channel 7 extending through the neutron reflector 71 between
4 and.

That is, when the neutron reflector 71 rises in the moving region 8 and the neutron reflector 71 descends in the moving region 8 by the coolant pumped upward from the lower part of the moving region 8. , Neutron reflector 71
The coolant below the through hole 74 through the inlet 72
While flowing in, it is discharged from the discharge port 73 toward the inner wall surface of the moving region 8. As a result, the coolant is supplied into the gap between the inner wall surface of the moving region 8 and the side surfaces 71a, 71b of the neutron reflector 1 so that the inner wall surface of the moving region 8 and the neutron reflector 71 contact each other. Since this can be prevented, the neutron reflector 71 can be smoothly moved up and down inside the moving region 8.

In the modification shown in FIG. 20, a plurality of outlets 73 opening toward the inner wall surface of the moving region 8 are arranged in a vertically dispersed manner, and the outlets 73 and the receiving inlets are arranged. A through passage 75 extends between the neutron reflector 71 and the neutron reflector 71. As a result, the coolant is supplied over the entire gap between the inner wall surface of the moving region 8 and the side surfaces 71a, 71b of the neutron reflector 1 so that the inner wall surface of the moving region 8 and the neutron reflector 71 contact each other. Since this can be prevented, the neutron reflector 71 can be moved up and down more smoothly inside the moving region 8.

Seventh Embodiment Next, with reference to FIG. 21, a reflector control nuclear reactor of a seventh embodiment will be described.

The structure and operation of the reflector control reactor of the seventh embodiment are the same as those of the conventional reflector control reactor shown in FIGS. 29 to 32 except that the shape of the neutron reflector is partly different. It has the same structure and operation. Therefore, the difference in the shape of the neutron reflector and its effect will be described in detail.

As shown in FIG. 21, the neutron reflector 81 used in the reflector control reactor 80 of the seventh embodiment is
A through hole 82 penetrating vertically is provided. A guide shaft 83 extending vertically is provided in the through hole 82.
Has been inserted.

As a result, the neutron reflector 81 is moved to the guide shaft 8
Since it can be moved up and down in the moving area 8 while being guided by 3, the inner wall surface of the moving area 8 and the neutron reflector 81
The neutron reflector 81 can be smoothly moved up and down within the moving region 8 by preventing contact with the neutron reflector 81. In addition,
The vertical movement of the neutron reflector 81 can be guided by the plurality of guide shafts 83.

Eighth Embodiment Next, a reflector control reactor of an eighth embodiment will be described with reference to FIGS. 22 and 23.

The structure and operation of the reflector control reactor of the eighth embodiment are the same as those of the conventional reflector control reactor shown in FIGS. 29 to 32, except that the shape of the neutron reflector is partly different. It has the same structure and operation. Therefore, the difference in the shape of the neutron reflector and its effect will be described in detail.

As shown in FIG. 21, the neutron reflector 91 used in the reflector control reactor 90 of the eighth embodiment is the same as the neutron reflector 81 of the above-described seventh embodiment, cut in the horizontal plane to move in the vertical direction. The structure is divided into a plurality of parts 92, 93, 94. And each divided part 9
2, 93, 94 have through holes 92a, 93a, 94a penetrating in the vertical direction, and a guide shaft 95 extending in the vertical direction is inserted into these through holes. Thereby, each part 92, 9 of the neutron reflector 91
3 and 94 are guided by the guide shaft 95 to move the moving area 8
Since it does not come into contact with the inner wall surface of the, the inside of the moving region 8 can be smoothly moved up and down.

On the other hand, each of the portions 92, 93, 94 constituting the neutron reflector 91 has a rectangular sectional shape when cut along a vertical plane, and the sectional area when cut along a horizontal plane is an upper portion 92. Is the largest and lower part 94
Is the smallest. In other words, the bottom surface 9 of the upper part 92
2a has the largest area, and the bottom surface 94c of the lower portion 94
Has the smallest area. In other words, in the gap between each side surface of each of the portions 92, 93, 94 forming the neutron reflector 91 and the inner wall surface of the moving region 8, the upper portion 92 is the narrowest and the lower portion 94 is the most. wide.

That is, among the portions 92, 93, 94 constituting the neutron reflector 91, the gap between the upper portion and the inner wall surface of the moving region 8 is narrower, and therefore the upper portion of the moving region 8 is directed upward. The uppermost portion 92 and the lowermost portion 94 have the smallest fluid force received from the coolant pumped by the pump. Thereby, when pumping the coolant to raise the neutron reflector 91,
By controlling the flow rate of the coolant pumped,
It is possible to control how many of the portions 92, 93, 94 are raised from the top. Specifically, by lowering the flow rate of the coolant pumped upward from the lower part of the moving region 8, only the upper part 92 is raised, and by slightly increasing the flow rate, the upper part 92 and the center part are increased. By raising part 93 and maximizing the flow rate, all parts 92, 93, 94 can be raised.

Further, when the neutron reflector 91 descends inside the moving region 8, the fluid resistance received from the coolant is smaller toward the lower part. Accordingly, when the supply of the coolant by pumping is stopped and the neutron reflector 91 is lowered, the lower part is more likely to be lowered, so that the entire neutron reflector 91 can be smoothly lowered. Further, the respective portions 92, 93, 94 of the neutron reflector 91 divided into a plurality of portions in the vertical direction have smaller vertical dimensions than in the case where the neutron reflector is integrally formed. Even if it is tilted inside, the amount of displacement in the front-rear direction is small, and it is difficult to contact the inner wall surface of the moving region 8. As a result, the entire neutron reflector 91 can be smoothly moved up and down inside the moving region 8.

Note that, as shown as a modification in FIG. 23, it is also possible to exclude the vertical movement guide by the guide shaft 95 extending in the vertical direction.

Ninth Embodiment Next, a reflector control reactor of a ninth embodiment will be described with reference to FIGS. 24 and 25.

The structure and operation of the reflector control reactor of the ninth embodiment are the same as those of the conventional reflector control reactor shown in FIGS. 29 to 32 except that the shape of the neutron reflector is partly different. It has the same structure and operation. Therefore, the difference in the shape of the neutron reflector and its effect will be described in detail.

As shown in FIG. 24, in the reflector control nuclear reactor 100 of the ninth embodiment, the moving region 8 has a cross-sectional shape which is tapered upward when cut along a vertical plane. It has an open shape. That is, the core barrel 6 and the partition wall 7 are tilted at a predetermined tilt angle with respect to the vertical axis, and the distance between the core barrel 6 and the partition wall 7 becomes wider toward the upper side.

The pair of front and rear side surfaces 101a and 101b of the neutron reflector 101 extend in parallel with the inner wall surfaces of the moving region 8 facing each other. Furthermore, a projecting portion 102 that projects toward the inner wall surface of the moving region 8 is provided at the upper ends of the pair of front and rear side surfaces 101a and 101b.

As a result, as the neutron reflector 101 moves upward inside the moving region 8, the inner wall surface of the moving region 8 and the pair of front and rear side faces 101a of the neutron reflecting member 101,
Since the gap between the neutron reflector 101 and the neutron reflector 101 becomes wider, the fluid force received by the neutron reflector 101 from the coolant pumped upward from the lower part of the moving region 8 is larger than that of the moving region 8. It gradually becomes smaller as it moves upward in the interior. Therefore, by controlling the flow rate of the coolant pumped upward from the lower part of the moving region 8, the neutron reflector 1 inside the moving region 8 is controlled.
The furnace position can be continuously controlled by continuously controlling the vertical position of 01.

At this time, both side surfaces 10 of the neutron reflector 91
Since the fluid force from the coolant acts upward on the protrusion 102 provided at the upper end of each of the neutron reflectors 1a and 101b.
The posture of 01 can be stabilized. Further, since the pair of front and rear side surfaces 101a and 101b of the neutron reflector 101 are inclined downward in accordance with the inclination of the inner wall surface of the moving region 8, the neutron reflector 101 may be caught on the inner wall surface of the moving region 8. Therefore, the neutron reflector 101 can be smoothly lowered inside the moving region 8.

In the modification shown in FIG. 25, a guide surface 104 for guiding the flow of the coolant is formed at the lower end of the neutron reflector 103. As a result, the flow of the coolant flowing upward from the lower part of the moving region 8 is directed to the inner wall surface of the moving region 8 and the pair of front and rear side surfaces 10 of the neutron reflector 103.
3a, 103b, it is possible to prevent the turbulent flow of the coolant from occurring around the lower end of the neutron reflector 103 and to further stabilize the posture of the neutron reflector 103. You can

Tenth Embodiment Next, a reflector control reactor of a tenth embodiment will be described with reference to FIG.

The structure and operation of the reflector controlled nuclear reactor of the tenth embodiment are similar to those of the conventional reflector controlled nuclear reactor shown in FIGS. 29 to 32 except that the shape of the neutron reflector is partially different. It has the same structure and operation. Therefore, the difference in the shape of the neutron reflector and its effect will be described in detail.

As shown in FIG. 26, in the reflector control reactor 110 of the tenth embodiment, the moving region 8 is
The cross-sectional shape when cut along the vertical plane is a shape that gradually expands from the bottom to the top. That is, the core barrel 6 has wall surfaces 6a, 6 extending in the vertical direction, respectively.
b, 6c are formed stepwise, and the partition wall 7
Also wall surfaces 7a, 7b, 7c extending in the vertical direction, respectively.
Are formed in a staircase. And the space | interval between the wall surface 6a and the wall surface 7a which oppose each other is the narrowest, and the space | interval between the wall surface 6c and the wall surface 7c is the widest.

On the other hand, the neutron reflector 111 has a pair of front and rear side surfaces 111a and 111b extending in parallel to each other, and a guide surface 112 for guiding the flow of the coolant is provided at the lower end portion thereof, and a pair of front and rear side surfaces. 111a, 11
A protrusion 113 is provided at the upper end of 1b.

As a result, when the neutron reflector 111 is located between the wall surface 6a and the wall surface 7a that face each other, the gap between the inner wall surface of the moving region 8 and the side surface of the neutron reflector 111 is the smallest, When the reflector 111 is located between the wall surface 6c and the wall surface 7c that face each other, the moving region 8
The gap between the inner wall surface and the side surface of the neutron reflector 111 is the widest. That is, the size of the gap between the inner wall surface of the moving region 8 and the side surface of the neutron reflector 111 is
It changes stepwise in accordance with the vertical position of the neutron reflector 111 inside.

On the other hand, the magnitude of the fluid force that the neutron reflector 111 receives from the coolant pumped upward from the lower part of the moving region 8 is such that the neutron reflector 111 moves upward inside the moving region 8. It gradually becomes smaller as it goes. Therefore, by controlling the flow rate of the coolant pumped upward from the lower part of the moving region 8, the vertical position of the neutron reflector 111 inside the moving region 8 is continuously controlled, and the reactor output is increased. It can be controlled continuously.

More specifically, the neutron reflector 111 can be located between the wall surface 6a and the wall surface 7a by reducing the flow rate of the coolant. By increasing the flow rate of the coolant, the neutron reflector 111 can be located between the wall surface 6b and the wall surface 7b. By further increasing the flow rate of the coolant, the neutron reflector 111 can be located between the wall surface 6c and the wall surface 7c.

Further, both side surfaces 111 of the neutron reflector 111
Since the fluid force from the coolant acts upward on the protrusion 113 provided on the upper ends of the a and 111b, the neutron reflector 11
The posture of No. 1 can be stabilized. In addition, the moving area 8
Of the coolant flowing upward from the lower part of the neutron reflector 111 by the guide surface 112 provided at the lower end of the neutron reflector 111 Since the neutron reflector 111 can be guided between the neutron reflector 111 and the neutron reflector 111
The posture can be further stabilized. Further, since the guide surface 112 is provided at the lower end portion of the neutron reflector 111, the neutron reflector 111 is formed on the step portion of the inner wall surface of the moving region 8.
Does not get caught.

Eleventh Embodiment Next, a reflector control reactor of the eleventh embodiment will be described with reference to FIGS. 27 and 28.

The structure of the reflector-controlled nuclear reactor 120 of the 11th embodiment shown in FIG. 27 is different from the structure of the conventional reflector-controlled nuclear reactor 1 shown in FIG. That is, the lower portion of the reactor vessel 121 is thin, and the neutron shield 5 annularly arranged around the core 3 is the reactor vessel 121.
Located outside of. Further, between the surface of the reactor vessel 121 and the neutron shield 5, an electromagnet 123 for vertically displacing the neutron reflector 122 by magnetic force.
Are arranged in an annular shape around the reactor vessel 121 so as to face the neutron reflector 122 in the radial direction. The electromagnet 123 can be freely moved up and down by an electromagnet driving mechanism 124 using a ball screw and an electric motor and a control device 125. Further, the lower end of the moving region 8 in which the neutron reflector 122 moves up and down is closed so that the flow of the coolant circulated by the electromagnetic pump 9 does not enter the moving region 8.

According to the reflector control nuclear reactor 120 of the 11th embodiment having such a structure, the electromagnet driving mechanism 12
4, the neutron reflector 111 captured by the magnetic force of the electromagnet 123 can be moved up and down inside the moving region 8 by changing the vertical position of the electromagnet 123. At this time, since the flow of the coolant does not exist inside the moving region 8, the neutron reflector 122 can be moved up and down in the moving region 8 without vibrating in the vertical direction.

Incidentally, in conjunction with the stoppage of the operation of the electromagnetic pump 9 which circulates the coolant inside the reactor vessel 121, the control device 125 cuts off the energization of the electromagnet 123, so that the electromagnetic pump 9 is stopped. Neutron reflector 12
2 can be lowered inside the movement area 8.

On the other hand, in the modification shown in FIG. 28, the coolant inlet 8a is provided at the lower end of the moving region 8 and the coolant circulating in the reactor vessel 121 by the electromagnetic pump 9 is used. Enter the moving region 8 and contribute to the ascending operation of the neutron reflector 111.

Although the embodiments of the reflector control reactor according to the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made. . For example, the protrusion 22 of the neutron reflector 21 of the first embodiment shown in FIG. 4 can be provided on the side surface of the neutron reflector 51 of the fourth embodiment shown in FIG.

[0107]

As is apparent from the above description, according to the reflector control reactor of the present invention, the neutron reflector can be smoothly moved up and down within the moving region.

[Brief description of drawings]

FIG. 1 is a perspective view showing one of neutron reflectors used in a reflector control reactor according to a first embodiment of the present invention.

FIG. 2 is a horizontal sectional view schematically showing a main part of a reflector control reactor according to the first embodiment of the present invention.

3 is a vertical cross-sectional view taken along the line AA shown in FIG.

FIG. 4 is a longitudinal sectional view of an essential part schematically showing the operation of the neutron reflector shown in FIG.

5 is an enlarged longitudinal sectional view of an essential part showing a modified example of the neutron reflector shown in FIG.

FIG. 6 is an enlarged longitudinal sectional view of an essential part showing a modified example of the neutron reflector shown in FIG.

7 is an enlarged longitudinal sectional view of an essential part showing a modified example of the neutron reflector shown in FIG.

8 is an enlarged perspective view of essential parts showing a modified example of the neutron reflector shown in FIG.

9 is a longitudinal cross-sectional view of a main part schematically showing the operation of the modified example of the neutron reflector shown in FIG.

FIG. 10 is a longitudinal sectional view of an essential part schematically showing the operation of the modified example of the neutron reflector shown in FIG.

FIG. 11 is a longitudinal sectional view of an essential part schematically showing the operation of the modified example of the neutron reflector shown in FIG.

FIG. 12 is a longitudinal sectional view of an essential part schematically showing the operation of the modified example of the neutron reflector shown in FIG.

FIG. 13 is an overall perspective view showing one of the neutron reflectors used in the reflector control reactor of the second embodiment according to the present invention.

FIG. 14 is a longitudinal cross-sectional view of an essential part schematically showing the operation of the neutron reflector used in the reflector control reactor of the third embodiment according to the present invention.

FIG. 15 is a longitudinal sectional view of an essential part schematically showing the operation of the modified example of the neutron reflector shown in FIG.

FIG. 16 is a longitudinal sectional view schematically showing the operation of the neutron reflector used in the reflector control reactor of the fourth embodiment according to the present invention.

FIG. 17 is a longitudinal sectional view of an essential part schematically showing the operation of the modified example of the neutron reflector shown in FIG. 16.

FIG. 18 is a longitudinal sectional view of an essential part schematically showing the operation of the neutron reflector used in the reflector control reactor of the fifth embodiment according to the present invention.

FIG. 19 is a longitudinal sectional view of an essential part schematically showing the operation of the neutron reflector used in the reflector control reactor of the sixth embodiment according to the present invention.

20 is a longitudinal sectional view of an essential part schematically showing the operation of the modified example of the neutron reflector shown in FIG.

FIG. 21 is a longitudinal sectional view of an essential part schematically showing the operation of the neutron reflector used in the reflector control reactor of the seventh embodiment according to the present invention.

FIG. 22 is a longitudinal sectional view of an essential part schematically showing the operation of the neutron reflector used in the reflector control reactor of the eighth embodiment according to the present invention.

FIG. 23 is a longitudinal sectional view of an essential part schematically showing the operation of the modification of the neutron reflector shown in FIG. 22.

FIG. 24 is a longitudinal sectional view of an essential part schematically showing the operation of the neutron reflector used in the reflector control reactor of the ninth embodiment according to the present invention.

FIG. 25 is a longitudinal sectional view of an essential part schematically showing the operation of the modification of the neutron reflector shown in FIG. 24.

FIG. 26 is a longitudinal sectional view of an essential part schematically showing the operation of the neutron reflector used in the reflector control reactor of the tenth embodiment according to the invention.

FIG. 27 is a longitudinal sectional view of an essential part schematically showing the operation of the neutron reflector used in the reflector control nuclear reactor of the eleventh embodiment according to the present invention.

FIG. 28 is a longitudinal sectional view of an essential part schematically showing the operation of the modified example of the neutron reflector shown in FIG. 27.

FIG. 29 is a longitudinal sectional view schematically showing the structure of a conventional reflector control reactor.

FIG. 30 is an enlarged view showing a main part of FIG. 29.

FIG. 31 is a horizontal sectional view taken along the line CC of FIG. 30.

32 is an overall perspective view showing one of the conventional neutron reflectors shown in FIG. 31. FIG.

[Explanation of symbols]

1 Conventional reflector control reactor 2 reactor vessel 3 core 4 Neutron reflector 5 Neutron shield 6 core barrel 7 partition 8 moving areas 9 Electromagnetic pump 10 Lower Plenum 11 Assembly area 12 Upper plenum 13 Drive mechanism 20 Reflector Control Reactor of First Embodiment 21 Neutron reflector 22 Projection 23 channel 24 Narrow space 25 groove 26 Guideway 30 Reflector Control Reactor of Second Embodiment 31 Neutron reflector 32 protrusion 40 Reflector Control Reactor of Third Embodiment 41 Neutron reflector 42 hollow 43 weights 50 Reflector Control Reactor of Fourth Embodiment 51 Neutron reflector 52 through channel 53, 54 throttle 55 Movable member 56 through channel 60 Reflector Control Reactor of Fifth Embodiment 61 Neutron reflector 62 guide wheels 70 Reflector Controlled Reactor of Sixth Embodiment 71 Neutron reflector 72 entrance 73 outlet 74 Through flow path 75 through channel 80 Reflector Control Reactor of Seventh Embodiment 81 Neutron reflector 82 through hole 83 Guide shaft 90 Reflector Control Reactor of Eighth Embodiment 91 Neutron reflector 92,93,94 each part 95 Guide shaft 100 Reflector Control Reactor of Ninth Embodiment 101 Neutron reflector 102 protrusion 103 Neutron reflector 104 guideway 110 Reflector Control Reactor of Tenth Embodiment 111 Neutron reflector 112 guideway 113 protrusion 120 Reflector Control Reactor of Eleventh Embodiment 121 reactor vessel 122 Neutron reflector 123 Electromagnet 124 Electromagnet drive mechanism 125 control device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiromitsu Inagaki             20 Kitakanzan, Otakamachi, Midori-ku, Nagoya-shi, Aichi             No. 1 Chubu Electric Power Co., Inc. (72) Inventor Masato Watanabe             20 Kitakanzan, Otakamachi, Midori-ku, Nagoya-shi, Aichi             No. 1 Chubu Electric Power Co., Inc. (72) Inventor Mitsuo Wakamatsu             2-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa             Ceremony Company Toshiba Hamakawasaki Factory (72) Inventor Toshihito Matsumiya             8th Shinsugita Town, Isogo Ward, Yokohama City, Kanagawa Prefecture             Ceremony company Toshiba Yokohama office

Claims (13)

[Claims] 1. The reactivity of the core is adjusted by adjusting the leakage of neutrons from the core by vertically moving a neutron reflector disposed around the core immersed in a coolant in a moving region. In a reflector control reactor for controlling, the neutron reflector includes a protrusion that protrudes from the side surface toward the inner wall surface of the moving region and narrows the flow path of the coolant between the inner wall surface and the side surface. A reflector control reactor characterized by the above. 2. The reflector-controlled nuclear reactor according to claim 1, wherein the protruding portion extends continuously in the horizontal direction along a side surface of the neutron reflector. 3. The reflector-controlled nuclear reactor according to claim 1, wherein the protrusion extends continuously in the vertical direction along a side surface of the neutron reflector. 4. The reactivity of the core is adjusted by adjusting the leakage of neutrons from the core by vertically moving a neutron reflector disposed around the core immersed in a coolant in a moving region. In the reflector-controlled nuclear reactor to be controlled, the neutron reflector has a portion having a lower density than other portions at its upper end portion. 5. The reactivity of the core is adjusted by adjusting the leakage of neutrons from the core by vertically moving a neutron reflector disposed around the core immersed in a coolant in a moving region. In the reflector control nuclear reactor to control, the said neutron reflector has a part whose density is higher than other parts in the lower end part, The reflector control nuclear reactor characterized by the above-mentioned. 6. The reactivity of the core is adjusted by adjusting the leakage of neutrons from the core by vertically moving a neutron reflector disposed around the core immersed in a coolant in a moving region. In a reflector control nuclear reactor to control, the neutron reflector has a through-flow passage that extends through the coolant in the up-down direction, and a movable member that can move up and down in the through-flow passage. Reflector control reactor characterized by. 7. The reactivity of the core is adjusted by adjusting the leakage of neutrons from the core by vertically moving a neutron reflector arranged around the core immersed in a coolant in a moving region. In a reflector control nuclear reactor to control, the neutron reflector guides the vertical movement of the neutron reflector by rolling on the inner wall surface of the moving region, a guide rotatably supported by the neutron reflector A reflector-controlled nuclear reactor comprising wheels. 8. The reactivity of the core is adjusted by adjusting the leakage of neutrons from the core by vertically moving a neutron reflector arranged around the core immersed in a coolant in a moving region. In a reflector control reactor to control, the neutron reflector is an inlet that receives the coolant by opening at the lower end of the neutron reflector, and an opening at the side surface of the neutron reflector that receives from the inlet. A reflector comprising: a discharge port for discharging the coolant toward the inner wall surface; and a through channel extending through the neutron reflector between the receiving port and the discharge port. Control reactor. 9. The reactivity of the core is adjusted by adjusting the leakage of neutrons from the core by vertically moving a neutron reflector arranged around the core immersed in a coolant in a moving region. A reflector control reactor for controlling, wherein the neutron reflector is equipped with a guide shaft that is inserted into a through hole that penetrates the neutron reflector in a vertical direction to guide vertical movement of the neutron reflector. . 10. The reactivity of the core is adjusted by adjusting the leakage of neutrons from the core by vertically moving a neutron reflector arranged around the core immersed in a coolant in a moving region. In the reflector control reactor to control, the neutron reflector is characterized in that the gap between the inner wall surface of the moving region is vertically divided into a plurality of parts that become narrower toward the upper part. Reflector controlled reactor. 11. The reactivity of the core is adjusted by adjusting the leakage of neutrons from the core by vertically moving a neutron reflector disposed around the core immersed in a coolant in a moving region. In the reflector-controlled nuclear reactor to be controlled, the moving region has a cross-sectional shape, when cut along a vertical plane, that widens upward from below to above. 12. The reactivity of the core is adjusted by adjusting the leakage of neutrons from the core by vertically moving a neutron reflector arranged around the core immersed in a coolant in a moving region. In the reflector-controlled nuclear reactor to be controlled, the moving region has a shape in which a cross-sectional shape when cut along a vertical plane gradually increases from a lower side to an upper side. 13. The reactivity of the core is adjusted by adjusting the leakage of neutrons from the core by vertically moving a neutron reflector arranged around the core immersed in a coolant in a moving region. A reflector control reactor for controlling, wherein the neutron reflector is vertically displaced by magnetic force, an electromagnet disposed around the neutron reflector, and an electromagnet for driving the electromagnet to vertically displace. A reflector control reactor, comprising: a drive mechanism.