JP2012163414A - Reactor vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reactor vessel which reduces self-excited vibrations of a wall-cooling structure due to vibrations of sloshing (liquid surface fluctuation).SOLUTION: The reactor vessel includes: an outer cylinder of the reactor vessel; an outer wall-cooling liner being a structure disposed inside the outer cylinder, beyond which a coolant in a space between the structure and the outer cylinder overflows into the reactor vessel; an inner wall-cooling liner which forms a return passage for returning the overflowing coolant to the space, between the outer wall-cooling liner and the inner wall-cooling liner; and a plurality of self-excited vibration preventing members which are in contact with a part of the overflowing coolant or a part of the coolant in the space between the outer wall-cooling liner and the inner wall-cooling liner and are arranged in a peripheral direction of the outer cylinder. Arrangements of the self-excited vibration preventing members include an arrangement irregular in the peripheral direction of the outer cylinder.

Description

  The present invention relates to a nuclear reactor vessel.

  In a nuclear power plant reactor, a wall cooling structure is provided between an outer cylinder of a reactor vessel and an inner cylinder in the outer cylinder to form a multi-cylindrical structure, and an annulus constituted by them is used for cooling. A structure in which liquid sodium flows may be adopted. For example, Patent Literature 1 describes a self-excited vibration-preventing wall cooling structure in which a protrusion whose front edge is located above the downstream free surface of liquid sodium is provided at the top of the wall cooling structure. In addition, because of this protrusion, the overflow cannot effectively give energy to the sloshing (liquid level fluctuation) of the liquid sodium in the downstream plenum, and the rigidity of the wall cooling structure increases and the eigenvalue increases. It is described that it has the effect of suppressing self-excited vibration.

Utility Model Registration No. 2590279

  Since sloshing (liquid level fluctuation) vibration includes periodic vibration, it is necessary to prevent self-excited vibration of the wall cooling structure due to further sloshing vibration.

  The present invention solves the above-described problems, and an object of the present invention is to provide a nuclear reactor vessel that reduces self-excited vibration of a wall cooling structure caused by sloshing vibration.

  In order to achieve the above-described object, the reactor vessel is a structure disposed inside the outer tube of the reactor vessel and the outer tube, and a coolant in the gap between the structure and the outer tube. An outer wall cold liner that overflows over the inside of the reactor vessel, and an inner wall cold liner that forms a return flow path for returning the coolant that has overflowed between the outer wall cold liner and the gap; Self-excited vibration prevention that is in contact with a part of the coolant that has overflowed or a part of the coolant in the gap between the outer wall cooling liner and the inner wall cooling liner and that is arranged in the circumferential direction of the outer cylinder And the array of the self-excited vibration preventing members includes an irregular array in the circumferential direction of the outer cylinder.

  As a result, the distribution amount of the coolant falling on the coolant surface in the gap between the outer wall cooling liner and the inner wall cooling liner becomes uneven in the circumferential direction, and even if sloshing vibration occurs The risk of fluctuations is reduced. Or the fall energy of a coolant is attenuate | damped and sloshing is suppressed. For this reason, the periodic self-excited vibration of the outer wall cooling liner or the inner wall cooling liner which is the wall cooling structure is reduced.

  As a desirable mode of the present invention, it is preferable that a part of the overflowed coolant collides with the self-excited vibration preventing member. Thereby, the flow of the overflowing coolant can be changed. For this reason, the coolant whose flow has been changed creates a time difference in the amount of fall between the coolant falling without colliding. Further, the self-excited vibration preventing member serves as an umbrella, and the distribution amount of the coolant that falls into the gap between the outer wall cold liner and the inner wall cold liner becomes uneven in the circumferential direction. As a result, the sloshing is less likely to be periodically fluctuated, and the possibility that the outer wall cooling liner or the inner wall cooling liner causes periodic self-excited vibration can be reduced.

  As a desirable mode of the present invention, the self-excited vibration preventing member is a plurality of convex portions formed at a part of an end portion of the outer wall cooling liner on a side where the coolant overflows, and from between the convex portions. It is preferable that the coolant that has overflowed falls to the inside of the reactor vessel. Thereby, the dripping distribution amount of the coolant that pours into the gap between the outer wall cold liner and the inner wall cold liner becomes uneven in the circumferential direction. As a result, the sloshing is less likely to be periodically fluctuated, and the possibility that the outer wall cooling liner or the inner wall cooling liner causes periodic self-excited vibration can be reduced.

  As a desirable mode of the present invention, the self-excited vibration preventing member is a member having a through hole arranged in the vicinity of the liquid level of the coolant in a gap between the outer wall cooling liner and the inner wall cooling liner. preferable. Thereby, a part of the vertical fluctuation of the gap between the outer wall cooling liner and the inner wall cooling liner is attenuated by the coolant passing through the through hole of the member having the through hole. As a result, the sloshing is less likely to be periodically fluctuated, and the possibility that the outer wall cooling liner or the inner wall cooling liner causes periodic self-excited vibration can be reduced.

  As a desirable mode of the present invention, the self-excited vibration preventing member is preferably a member having a through hole that covers a liquid surface of the coolant in a gap between the outer wall cooling liner and the inner wall cooling liner. Thereby, a part of the overflowing coolant once collides with the member having the through hole, and the coolant is partially passed through the through hole. Thereby, the fall energy of a coolant is attenuated and sloshing is suppressed. Further, part of the vertical fluctuation of the coolant level is attenuated by the coolant passing through the through hole. For this reason, sloshing is suppressed more.

  As a desirable mode of the present invention, the self-excited vibration preventing member extends in a radial direction between the outer wall cooling liner and the inner wall cooling liner, and in a gap between the outer wall cooling liner and the inner wall cooling liner. The plate member is preferably a plate member that blocks a part of the liquid surface of the coolant. Thereby, the shielding of the sloshing generated in the gap between the outer wall cooling liner and the inner wall cooling liner can be made uneven in the circumferential direction or the radial direction. As a result, the sloshing is less likely to be periodically fluctuated, and the possibility that the outer wall cooling liner or the inner wall cooling liner causes periodic self-excited vibration can be reduced.

  In order to achieve the above-described object, the reactor vessel is a structure disposed inside the outer tube of the reactor vessel and the outer tube, and the coolant in the gap between the structure and the outer tube. An outer wall cooling liner whose liquid level overflows to the inside of the reactor vessel and an inner wall cooling that forms a return flow path for returning the coolant that has overflowed between the outer wall cooling liner to the gap. And a self-excited vibration preventing member that blocks at least a part of a liquid level of the coolant in a gap between the outer wall cooling liner and the inner wall cooling liner.

  Thereby, the sloshing generated at the coolant level in the gap between the outer wall cooling liner and the inner wall cooling liner can be shielded, and the sloshing energy can be attenuated. As a result, it is possible to reduce the possibility that the outer wall cooling liner or the inner wall cooling liner causes periodic self-excited vibration.

  ADVANTAGE OF THE INVENTION According to this invention, the nuclear reactor vessel which reduces the self-excited vibration of the wall cooling structure by vibration of sloshing can be provided.

FIG. 1 is an explanatory diagram schematically showing a nuclear reactor vessel of a nuclear power plant. FIG. 2 is a perspective view showing the configuration of the self-excited vibration preventing member of the first embodiment. FIG. 3 is a plan view of FIG. FIG. 4 is a perspective view showing the configuration of the self-excited vibration preventing member of the second embodiment. FIG. 5 is a plan view of FIG. FIG. 6 is a perspective view showing the configuration of the self-excited vibration preventing member of the third embodiment. FIG. 7 is a plan view of FIG. FIG. 8 is a perspective view showing the configuration of the self-excited vibration preventing member of the third embodiment. FIG. 9 is a plan view of FIG.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined.

(Embodiment 1)
FIG. 1 is an explanatory diagram schematically showing a nuclear reactor vessel of a nuclear power plant. In a nuclear power plant, for example, there is a fast reactor type reactor that cools a reactor core with a liquid metal such as liquid sodium. In order to avoid the influence of the liquid sodium-water reaction, the fast reactor type reactor is provided with a primary sodium system and a secondary sodium system, and has an intermediate heat exchanger that performs heat exchange between the two systems. . The heat of secondary sodium is transferred to water in a steam generator to generate steam. Then, when the steam is supplied to the steam turbine, the steam turbine is driven to supply power to the generator.

  The reactor vessel of the nuclear power plant shown in FIG. 1 is a reactor vessel of a fast reactor type reactor. The nuclear reactor vessel 1 has a cylindrical shape around the central axis O. In FIG. 1, the reactor vessel 1 has a central axis O as an axis of symmetry, and thus is shown in a partial cross-sectional view with a part omitted. A reactor vessel 1 shown in FIG. 1 includes a core structure 11, an outer cylinder 13, an inner wall cooling liner 19, an outer wall cooling liner 17, a lower plenum 21, a lower intermediate plenum 23, and an outer annulus 25. , An inner annulus 27, an upper intermediate plenum 31, an upper plenum 33, an inlet flow hole 41, an outlet flow hole 42, and coolant flow paths F1, F2, F3, F4, F5, F6, and F7.

  The core structure 11 includes fuel rods, and the fuel rods include pellets such as Pu-U mixed oxide. By operating the nuclear reactor, Pu in the core structure 11 can be propagated. The outer cylinder 13 has a substantially cylindrical shape and can hold the core structure 11 therein.

  The outer side wall cooling liner 17 has a cylindrical shape formed at a predetermined interval on the inner periphery of the outer cylinder 13. Thereby, the outer wall cooling liner 17 can hold the coolant, which is a liquid metal such as liquid sodium, by the outer annulus 25 that is an annular gap with the outer cylinder 13. The inner wall cold liner 19 has a cylindrical shape formed at a predetermined interval on the inner periphery of the outer wall cold liner 17. The inner wall cold liner 19 can hold the coolant with an inner annulus 27 that is an annular gap with the outer wall cold liner 17. As a result, the inner annulus 27 becomes a return flow path for the coolant. A rectifying plate that rectifies the flow of the coolant may be inserted into the inner annulus 27 between the inner wall cooling liner 19 and the outer wall cooling liner 17. Further, the outer wall cooling liner 17 or the inner wall cooling liner 19 has a wall cooling structure.

  The lower plenum 21, the lower intermediate plenum 23, the upper intermediate plenum 31, and the upper plenum 33 are spaces through which the coolant flows around the core structure 11 in the reactor vessel 1. The core structure 11 is disposed so as to be sandwiched between the lower plenum 21 and the upper plenum 33. The coolant supplied from the intermediate heat exchanger is supplied to the lower plenum 21. The coolant of the upper plenum 33 is supplied to the intermediate heat exchanger. The lower intermediate plenum 23 and the upper intermediate plenum 31 are spaces provided in the middle of the coolant flow path from the lower plenum 21 to the upper plenum 33 and can be omitted depending on the coolant flow path. The inlet flow hole 41 is a hole that connects the lower intermediate plenum 23 and the outer annulus 25. The outlet flow hole 42 is a hole that connects the inner annulus 27 and the upper intermediate plenum 31.

  Next, the coolant flow path of the reactor vessel 1 shown in FIG. 1 will be described. The coolant channels F 1, F 2, F 3, F 4, F 5, F 6, and F 7 are channel systems that circulate the coolant in the reactor vessel 1. The coolant channel F1 is a channel for conveying the coolant from the lower plenum 21 to the lower intermediate plenum 23. The coolant flow path F <b> 2 is a flow path for transporting the coolant from the lower intermediate plenum 23 to the outer annulus 25 via the inlet flow hole 41. The coolant channel F3 is a channel for conveying the coolant in the outer annulus 25 in the liquid surface direction. The coolant channel F4 is a coolant overflow channel (overflow) in which the coolant level in the outer annulus 25 overflows to the inside of the reactor vessel 1 and the coolant passes over the outer wall cooling liner 17. is there. The coolant channel F5 is a channel for transporting the coolant in a direction in which the coolant in the inner annulus 27 moves away from the liquid surface in the inner annulus 27. The coolant flow path F6 is a flow path for transporting the coolant from the inner annulus 27 to the upper intermediate plenum 31 via the outlet flow hole 42. The coolant channel F7 is a channel for conveying the coolant from the upper intermediate plenum 31 to the upper plenum 33. The reactor vessel 1 has a flow path system for circulating the coolant, so that the coolant heated by the core structure 11 can be circulated in the reactor vessel 1. Thereby, the heat distribution in the reactor vessel 1 is adjusted, and the thermal stress generated in the reactor vessel 1 is relaxed.

  FIG. 2 is a perspective view showing the configuration of the self-excited vibration preventing member of the first embodiment. FIG. 3 is a plan view of FIG. As shown in FIG. 2, the outer wall cooling liner 17 has self-excited vibration preventing members 51, 52, 53 on the wall surface on the inner annulus 27 side.

  The self-excited vibration preventing members 51, 52 and 53 have a flat plate shape. The self-excited vibration preventing members 51, 52, 53 are arranged at intervals in a circumferential direction C parallel to the circumferential direction of the outer cylinder 13 of the reactor vessel 1 shown in FIG. The widths in the circumferential direction C of the self-excited vibration preventing members 51, 52, and 53 are widths w1, w2, and w3, respectively. The interval between the self-excited vibration preventing member 51 and the self-excited vibration preventing member 52 is an interval t1. The interval between the self-excited vibration preventing member 52 and the self-excited vibration preventing member 53 is an interval t2.

  As described above, the coolant flow path F4 shown in FIG. 2 is a coolant in which the coolant level in the outer annulus 25 overflows to the inside of the reactor vessel 1 and the coolant passes over the outer wall cooling liner 17. Overflow channel (overflow). The self-excited vibration preventing members 51, 52, and 53 of the present embodiment collide with a part of the coolant that falls over the outer wall cooling liner 17 and falls. Thereby, the flow of the coolant is changed along the self-excited vibration preventing members 51, 52, 53 as in the coolant flow path F11 shown in FIG. 2, and collides with the self-excited vibration preventing members 51, 52, 53. This will create a time difference in the amount of fall with the coolant that falls without it. In addition, the self-excited vibration preventing members 51, 52, and 53 serve as umbrellas, and the amount of the coolant dropped onto the inner annulus 27 becomes uneven in the circumferential direction C of the inner annulus 27.

  The arrangement of the self-excited vibration preventing members 51, 52, 53 is arranged in the circumferential direction of the outer cylinder 13 of the nuclear reactor vessel 1 in order to make the distribution amount of the coolant falling on the inner annulus 27 uneven along the circumferential direction C. C preferably contains an irregular arrangement. As shown in FIG. 3, when the widths w1, w2, and w3 are the same, the self-excited vibration preventing members 51, 52, and 53 are arranged so that the intervals t1 and t2 are different. The self-excited vibration preventing members 51, 52, 53 are arranged at unequal intervals in the circumferential direction C of the outer cylinder 13 of the reactor vessel 1. Alternatively, the self-excited vibration preventing members 51, 52, and 53 are arranged so that the widths w1, w2, and w3 are different when the intervals t1 and t2 are the same. The self-excited vibration preventing members 51, 52 and 53 are arranged with unequal widths in the circumferential direction C of the outer cylinder 13 of the nuclear reactor vessel 1. Alternatively, the self-excited vibration preventing members 51, 52, 53 may be arranged such that the widths w1, w2, w3 and the intervals t1, t2 are different from each other. Note that the arrangement of the self-excited vibration preventing members illustrated in FIGS. 2 and 3 only needs to include an irregular arrangement on any of the entire circumference in the circumferential direction C of the outer cylinder 13 of the nuclear reactor vessel 1.

  As described above, the reactor vessel of the present embodiment is the outer cylinder 13 of the nuclear reactor vessel 1 and the structure disposed inside the outer cylinder 13, and is located in the gap between the structure and the outer cylinder 13. The coolant that overflows between the outer wall cooling liner 17 and the outer wall cooling liner 17 where the coolant level in an outer annulus 25 overflows and enters the inside of the reactor vessel 1 is the inner space that is the gap. Self-excitation of an inner wall cooling liner 19 that forms a return channel for returning to the annulus 27 and a plurality of outer wall cooling liners 17 that are in contact with a part of the overflowed coolant and arranged in the circumferential direction C of the outer cylinder 13 The vibration preventing members 51, 52, 53 are included, and the arrangement of the self-excited vibration preventing members 51, 52, 53 includes an irregular arrangement in the circumferential direction C of the outer cylinder 13 of the reactor vessel 1.

  Sloshing (liquid level fluctuation) of the coolant such as liquid sodium is generated by the coolant channel F4 and the coolant channel F11. Here, since the distribution amount of the coolant that falls on the inner annulus 27 is uneven in the circumferential direction C of the inner annulus 27, the sloshing is less likely to be periodically fluctuated, and the outer wall cooling liner 17 or the inner wall cooling liner 19 The risk of causing periodic self-excited vibration can be reduced.

  A part of the overflowing coolant that falls falls on the self-excited vibration preventing members 51, 52, and 53. As a result, the self-excited vibration preventing members 51, 52, 53 serve as umbrellas, and the amount of the coolant dropped onto the inner annulus 27 becomes uneven in the circumferential direction C of the inner annulus 27. For example, when the self-excited vibration preventing members 51, 52, 53 are formed of a porous plate having a plurality of through holes, a part of the coolant that collides with the self-excited vibration preventing members 51, 52, 53 is self-excited vibration preventing member. It can pass through 51, 52, 53 and can be dropped onto the inner annulus 27. As a result, the distribution amount of the coolant dropped onto the inner annulus 27 becomes uneven in the circumferential direction C of the inner annulus 27. The through hole is preferably formed in parallel with the free fall direction of the coolant.

(Embodiment 2)
FIG. 4 is a perspective view showing the configuration of the self-excited vibration preventing member of the second embodiment. FIG. 5 is a plan view of FIG. In the reactor vessel 2 according to the present embodiment, the self-excited vibration preventing member is a plurality of convex portions formed at a part of the end portion on the coolant liquid surface side of the outer wall cooling liner, and overflows from between the convex portions. The feature is that the cooled coolant falls to the inside of the reactor vessel. In the following description, the same components as those described in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

  As shown in FIG. 4, the outer wall cooling liner 17 has an uneven shape at the end where the coolant overflows, and has notches 61, 62, 63, 64 formed at the overflowing end of the outer wall cooling liner 17. Have. The notch 61 is a space sandwiched between the convex portion 65 and the convex portion 66. The notch 62 is a space sandwiched between the convex portion 66 and the convex portion 67. The notch 63 is a space sandwiched between the convex portion 67 and the convex portion 68. The notch 64 is a space sandwiched between the convex portion 68 and the convex portion 69.

  Since the notches 61, 62, 63, 64 are lower than the tops of the convex portions 65, 66, 67, 68, 69, they are close to the coolant level in the outer annulus 25. For this reason, the coolant in the outer annulus 25 exceeds the notches 61, 62, 63, 64 in preference to the convex portions 65, 66, 67, 68, 69, and the coolant falls to the inner annulus 27. The notches 61, 62, 63, 64 are arranged at intervals in a circumferential direction C parallel to the circumferential direction of the outer cylinder 13 of the reactor vessel 2 shown in FIG. The width in the circumferential direction C of the notch 61 is a width w11. The width in the circumferential direction C of the notch 62 is a width w12. The width in the circumferential direction C of the notch 63 is a width w13. The width in the circumferential direction C of the notch 64 is a width w14. The width of the projection 66, which is the distance between the notch 61 and the notch 62, is a width t11. The width of the convex portion 67 that is the distance between the notch 62 and the notch 63 is a width t12. The width of the convex portion 68 that is the distance between the notch 63 and the notch 64 is a width t13.

  As described above, the coolant flow path F4 shown in FIG. 4 has the convex portions 65, 66, 67, 68 in which the coolant level in the outer annulus 25 is a self-excited vibration preventing member inside the reactor vessel 2. , 69 overflows the notches 61, 62, 63, 64, and the coolant flows over the outer wall cooling liner 17 (overflow). As a result, the flow of the coolant is changed along the arrangement of the convex portions 65, 66, 67, 68, 69 which are self-excited vibration preventing members, and a time difference in the amount of fall between the coolant and the falling coolant is generated. become. In addition, it overflows in preference to the notches 61, 62, 63, 64 between the convex portions, which are self-excited vibration preventing members, and the amount of the coolant dropped onto the inner annulus 27 is reduced in the circumferential direction C of the inner annulus 27. Becomes unequal.

  In order to make the amount of distribution of the coolant dropped onto the inner annulus 27 non-uniform along the circumferential direction C, the arrangement of the convex portions 65, 66, 67, 68, 69, which are self-excited vibration preventing members, is It is preferable that an irregular arrangement is included in the circumferential direction C of the two outer cylinders 13. The convex portions 66, 67, and 68 are arranged so that the widths t11, t12, and t13 of the convex portions are different when the notch widths w11, w12, w13, and w14 are the same. Alternatively, the protrusions 66, 67, and 68 are arranged so that the notch widths w11, w12, w13, and w14 are different when the protrusions have the same widths t11, t12, and t13. Or convex part 66, 67, 68 may be arrange | positioned so that notch width w11, w12, w13, w14 and convex part width t11, t12, t13 may each differ. The same applies to the convex portions 65 and 69. Note that the arrangement of the self-excited vibration preventing members illustrated in FIGS. 4 and 5 may include an irregular arrangement on any of the entire circumferences in the circumferential direction C of the outer cylinder 13 of the reactor vessel 2.

  As described above, the reactor vessel of the present embodiment is a structure disposed inside the outer tube 13 of the reactor vessel 2 and the outer tube 13, and in the gap between the structure and the outer tube 13. The coolant that overflows between the outer wall cooling liner 17 and the outer wall cooling liner 17 where the liquid level of the coolant in the outer annulus 25 overflows and enters the inside of the reactor vessel 2 is the inner space that is the gap. The inner wall cooling liner 19 forming a return flow path for returning to the annulus 27 is in contact with a part of the overflowed coolant at the notches 61, 62, 63, 64 and is arranged in the circumferential direction C of the outer cylinder 13. Including the convex portions 65, 66, 67, 68, 69 that are the self-excited vibration preventing members, and the arrangement of the convex portions 65, 66, 67, 68, 69 that are the self-excited vibration preventing members is the reactor vessel 2 Irregular in the circumferential direction C of the outer cylinder 13 It contains the Do array.

  The sloshing of the liquid level of the coolant such as liquid sodium is generated by the coolant channel F4. Since the distribution amount of the coolant that pours into the inner annulus 27 is uneven in the circumferential direction C of the inner annulus 27, the sloshing is less likely to be periodically varied, and the outer wall cooling liner 17 or the inner wall cooling liner 19 is periodic. The possibility of causing self-excited vibration can be reduced.

  The self-excited vibration preventing member is a plurality of convex portions 65, 66, 67, 68, 69 formed at a part of the end portion on the coolant liquid surface side of the outer wall cooling liner 17, and a cut between the convex portions. The coolant that has overflowed from the notches 61, 62, 63, 64 falls into the reactor vessel 2. As a result, the distribution amount of the coolant dropped onto the inner annulus 27 becomes uneven in the circumferential direction C of the inner annulus 27.

(Embodiment 3)
FIG. 6 is a perspective view showing the configuration of the self-excited vibration preventing member of the third embodiment. FIG. 7 is a plan view of FIG. The reactor vessel 3 according to the present embodiment is a member in which the self-excited vibration preventing member has a plurality of through holes arranged in the vicinity of the coolant level in the gap between the outer wall cold liner and the inner wall cold liner. There are features. In the following description, the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 6 and 7, the perforated plates 71, 72, 73 that are self-excited vibration preventing members can pass a part of the coolant overflowing from the outer wall cooling liner 17. The perforated plates 71, 72, 73 are members having a plurality of through holes. The perforated plates 71, 72, 73 which are excitation vibration preventing members are buried below the coolant level in the gap between the outer wall cold liner 17 and the inner wall cold liner 19. A part of the vertical fluctuation of the coolant level is attenuated by the coolant passing through the through holes of the perforated plates 71, 72, 73. For this reason, sloshing is suppressed. The perforated plates 71, 72, 73 are plate-like members in this embodiment, but may be spherical or cylindrical. The through hole is preferably formed perpendicular to the coolant level when there is no sloshing (parallel to the free fall direction of the coolant). Thereby, a coolant becomes easy to pass.

  The reactor vessel of the present embodiment is a structure disposed inside the outer tube 13 of the reactor vessel 3 and the outer tube 13, and the coolant level in the gap between the structure and the outer tube 13. An inner wall cold liner that forms a return flow path for returning the coolant that has overflowed between the outer wall cold liner 17 and the outer wall cold liner 17 to the inside of the reactor vessel 3. 19, and a member having a through hole that is a self-excited vibration preventing member, and is preferably disposed so as to include a coolant inside the through holes of the perforated plates 71, 72, 73. Thereby, the coolant is moved up and down in the through hole. Thereby, the energy of the vertical vibration of the liquid level is attenuated, and sloshing is suppressed.

  The perforated plates 71, 72, 73, which are self-excited vibration preventing members, are arranged at intervals in a circumferential direction C parallel to the circumferential direction of the outer cylinder 13 of the reactor vessel 3 shown in FIG. The width in the circumferential direction C of the perforated plate 71 is the width w21. The width in the circumferential direction C of the porous plate 72 is a width w22. The interval between the perforated plate 71 and the perforated plate 72 is an interval t21. The interval between the perforated plate 72 and the perforated plate 73 is the interval t22. The interval t21 and the interval t22 are preferably different from each other. When the radial direction of the reactor vessel 3 is a radial direction D, the length of the porous plate 71 in the radial direction D is a width d1. The length in the radial direction D of the porous plate 72 is a width d2. The width d2 is equal to the length (distance) from the outer wall cold liner 17 to the inner wall cold liner 19 in the radial direction D. Thereby, the porous plate 72 can suppress the sloshing in the radial direction D. Since the length in the radial direction D of the porous plate 71 and the length in the radial direction D of the porous plate 72 are different, sloshing can be made irregular. The perforated plates 71, 72, and 73 may be annular plate members that are the same as or similar to the inner annulus 27 without being divided.

  As described above, the coolant flow path F4 shown in FIG. 6 has a coolant level in the outer annulus 25 that overflows to the inside of the reactor vessel 3 and the coolant passes over the outer wall cooling liner 17. An overflow channel (overflow). Thereby, the flow of the coolant is dripped onto the perforated plates 71, 72, 73 which are self-excited vibration preventing members. Since the perforated plates 71, 72, 73 are formed of a member having a through hole, the coolant is partially passed through the through hole. Thereby, the energy of the vertical vibration of the liquid level is attenuated, and sloshing is suppressed.

  Further, the perforated plates 71, 72, 73 are irregularly arranged in the circumferential direction C or the radial direction D, so that the amount of coolant dropped onto the inner annulus 27 is reduced in the circumferential direction C or radial direction of the inner annulus 27. D is unequal. When the widths w21 and w22 are the same, the porous plates 71 and 72 are arranged such that the intervals t21 and t22 are different from each other. Further, the porous plates 71 and 72 are arranged so that the widths w21 and w22 are different when the intervals t21 and t22 are the same. Or the perforated plates 71 and 72 may be arrange | positioned so that width | variety w21 and w22 and space | interval t21 and t22 may each differ. The same applies to the perforated plate 73. Note that the arrangement of the self-excited vibration preventing members illustrated in FIGS. 6 and 7 may include an irregular arrangement on any of the entire circumferences in the circumferential direction C of the outer cylinder 13 of the reactor vessel 3.

  As described above, the reactor vessel of the present embodiment is a structure disposed inside the outer tube 13 of the reactor vessel 3 and the outer tube 13, and in the gap between the structure and the outer tube 13. The coolant that overflows between the outer wall cooling liner 17 and the outer wall cooling liner 17 where the liquid level of the coolant in an outer annulus 25 overflows and enters the inside of the reactor vessel 3 is the inner space that is the gap. The inner wall cooling liner 19 that forms a return channel for returning to the annulus 27, and a part of the coolant that forms the return channel in the gap between the outer wall cooling liner 17 and the inner wall cooling liner 19, and Members having through holes (perforated plates 71, 72, 73) that are self-excited vibration preventing members arranged in a plurality in the circumferential direction C of the outer cylinder, and including through-hole members (porous plates 71, 72, 73) Arrangement is irregular in the circumferential direction C of the outer cylinder 13 It contains an array.

  The sloshing of the liquid level of the coolant such as liquid sodium is generated by the coolant channel F4. Here, since the distribution amount of the coolant that falls on the inner annulus 27 is uneven in the circumferential direction C of the inner annulus 27, the sloshing is less likely to be periodically fluctuated, and the outer wall cooling liner 17 or the inner wall cooling liner 19 The risk of causing periodic self-excited vibration can be reduced.

  The perforated plates 71, 72, 73 that are self-excited vibration preventing members are members having through holes arranged in the vicinity of the coolant level of the inner annulus 27 that forms a return channel with the outer wall cooling liner 17. is there. In addition, the distribution amount of the coolant dropped onto the inner annulus 27 is uneven in the circumferential direction C of the inner annulus 27.

  The perforated plate 72 which is a self-excited vibration preventing member is a member having a through hole disposed in the vicinity of the coolant level of the inner annulus 27 in the gap between the outer wall cooling liner 17 and the inner wall cooling liner 19 and the radial direction. It is preferable that the length of D is equal to the length of the inner annulus 27. As a result, the sloshing in the radial direction D is unlikely to periodically change, and the possibility that the outer wall cooling liner 17 or the inner wall cooling liner 19 causes periodic self-excited vibration can be reduced.

  The perforated plates 71, 72, 73 that are self-excited vibration preventing members may cover the coolant level in the gap between the outer wall cold liner 17 and the inner wall cold liner 19. As a result, a part of the overflowed coolant once collides with the perforated plates 71, 72, 73 and partially passes the coolant. Thereby, the fall energy of a coolant is attenuated and sloshing is suppressed. Further, part of the vertical fluctuation of the coolant level is attenuated by the coolant passing through the through holes of the perforated plates 71, 72, 73. For this reason, sloshing is suppressed more.

  The reactor vessel of the present embodiment is a structure disposed inside the outer tube 13 of the reactor vessel 3 and the outer tube 13, and the coolant level in the gap between the structure and the outer tube 13. An inner wall cold liner that forms a return flow path for returning the coolant that has overflowed between the outer wall cold liner 17 and the outer wall cold liner 17 to the inside of the reactor vessel 3. 19, and may be perforated plates 71, 72, 73 that are self-excited vibration preventing members that block at least a part of the coolant level in the gap between the outer wall cooling liner 17 and the inner wall cooling liner 19.

  The sloshing that occurs in the radial direction D is called a turning mode. Generation | occurrence | production of this turning mode can be reduced with either of the perforated plates 71, 72, and 73 which are self-excited vibration prevention members. As a result, the vibration of the outer wall cold liner 17 or the inner wall cold liner 19 due to the turning mode is reduced. By blocking the liquid surface of the coolant by the member having the through hole, the energy of sloshing generated in the radial direction D of the inner annulus 27 can be attenuated. As a result, the possibility that the outer wall cold liner 17 or the inner wall cold liner 19 causes periodic self-excited vibration can be reduced. Further, part of the vertical fluctuation of the coolant level is attenuated by the coolant passing through the through holes of the perforated plates 71, 72, 73. For this reason, sloshing is suppressed more.

(Embodiment 4)
FIG. 8 is a perspective view showing the configuration of the self-excited vibration preventing member of the third embodiment. FIG. 9 is a plan view of FIG. In the reactor vessel 4 according to the present embodiment, the self-excited vibration preventing member extends in the radial direction between the outer wall cooling liner and the inner wall cooling liner, and is cooled in the gap between the outer wall cooling liner and the inner wall cooling liner. It is characterized by being a plate member that blocks part of the liquid surface of the material. In the following description, the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 8 and 9, the sloshing shielding plates 81, 82, 83, 84, 85, 86 that are self-excited vibration preventing members are arranged in the radial direction D between the outer wall cooling liner 17 and the inner wall cooling liner 19. This is a plate member that extends to the side and blocks a part of the coolant level in the inner annulus 27 that is the gap between the outer wall cooling liner 17 and the inner wall cooling liner 19.

  The sloshing shielding plates 81, 82, 83, 84, 85, 86 are arranged at intervals in a circumferential direction C parallel to the circumferential direction of the outer cylinder 13 of the reactor vessel 4 shown in FIG. 9. The lengths in the radial direction D of the sloshing shielding plates 81, 82, 83, 84, 85, 86 are lengths d31, d32, d33, d34, d35, d36, respectively. The interval between the sloshing shielding plate 81 and the sloshing shielding plate 82 is an interval t31. The interval between the sloshing shielding plate 82 and the sloshing shielding plate 83 is an interval t32. The interval between the sloshing shielding plate 83 and the sloshing shielding plate 84 is an interval t33. The interval between the sloshing shielding plate 84 and the sloshing shielding plate 85 is an interval t34. The interval between the sloshing shielding plate 85 and the sloshing shielding plate 86 is an interval t35. The intervals t31, t32, t33, t34, and t35 are preferably different from each other. The length d36 is equal to the distance from the outer wall cold liner 17 to the inner wall cold liner 19 in the radial direction D. Thereby, the sloshing shielding board 86 can suppress the sloshing in the radial direction D. Moreover, sloshing can be made irregular by the length of the radial direction D of the sloshing shielding board 81, 82, 83, 84, 85, 86 differing. The sloshing shielding plates 81, 83, 84 and 86 are fixed to the outer wall cooling liner 17. The sloshing shielding plates 82, 85, 86 are fixed to the inner wall cold liner 19. Thereby, the position which interrupts a part of the liquid level of the coolant in the inner annulus 27 which is the gap between the outer wall cooling liner 17 and the inner wall cooling liner 19 can be varied. Note that the self-excited vibration preventing member illustrated in FIGS. 8 and 9 only needs to include an irregular arrangement in any of the entire circumferences in the circumferential direction C of the outer cylinder 13 of the reactor vessel 4.

  As described above, the coolant channel F4 shown in FIG. 8 is a coolant in which the coolant level in the outer annulus 25 overflows to the inside of the reactor vessel 4 and the coolant gets over the outer wall cooling liner 17. Overflow channel (overflow). As a result, even if sloshing occurs on the coolant level in the side annulus 27, the sloshing shield plate 81, 82, 83, 84, 85, 86, which is a self-excited vibration preventing member, can reduce the level of the liquid level. Part is blocked. For this reason, the sloshing is shielded by the sloshing shielding plates 81, 82, 83, 84, 85, 86. Thereby, sloshing is suppressed. The sloshing that occurs in the radial direction D is called a turning mode. Generation | occurrence | production of this turning mode can be reduced by either of the sloshing shielding boards 81, 82, 83, 84, 85, 86 which are self-excited vibration preventing members. As a result, the vibration of the outer wall cold liner 17 or the inner wall cold liner 19 due to the turning mode is reduced.

  Further, the sloshing shielding plates 81, 82, 83, 84, 85, 86 are irregularly arranged in the circumferential direction C or the radial direction D, so that the sloshing shielding state generated in the inner annulus 27 is reduced. It becomes unequal in the circumferential direction C or the radial direction D. When the lengths d31, d32, d33, d34, d35, d36 are the same, the sloshing shielding plates 81, 82, 83, 84, 85, 86 are arranged so that the intervals t31, t32, t33, t34, t35 are different. Is done. Or, the sloshing shielding plates 81, 82, 83, 84, 85, 86 have different lengths d31, d32, d33, d34, d35, d36 when the intervals t31, t32, t33, t34, t35 are the same. Placed in. Alternatively, the sloshing shielding plates 81, 82, 83, 84, 85, 86 are arranged such that the lengths d31, d32, d33, d34, d35, d36 and the intervals t31, t32, t33, t34, t35 are different. It may be.

  As described above, the nuclear reactor vessel of the present embodiment is a structure disposed inside the outer cylinder 13 of the nuclear reactor vessel 4 and the outer cylinder 13, and is located in the gap between the structure and the outer cylinder 13. The coolant level in a certain outer annulus 25 overflows into the reactor vessel 4 and gets over the outer wall cold liner 17, and the coolant that overflows between the outer wall cold liner 17 and the inner annulus as a gap. 27, an inner wall cooling liner 19 that forms a return flow path for returning to 27, a gap between the outer wall cooling liner 17 and the inner wall cooling liner 19, and a part of the coolant that forms the return flow path, and an outer cylinder And sloshing shielding plates 81, 82, 83, 84, 85, 86, which are self-excited vibration preventing members arranged in a plurality of circumferential directions C, and the sloshing shielding plates 81, 82, 83, 84, 85, 86. Array of nuclear reactors It contains irregular arranged in the circumferential direction C of 4 of the outer tube 13.

  The sloshing of the liquid level of the coolant such as liquid sodium is generated by the coolant channel F4. Here, the degree of shielding of sloshing generated in the inner annulus 27 becomes uneven in the circumferential direction C or the radial direction D of the inner annulus 27. For this reason, the sloshing is less likely to cause periodic fluctuations, and the possibility that the outer wall cooling liner 17 or the inner wall cooling liner 19 causes periodic self-excited vibration can be reduced.

  Sloshing shielding plates 81, 82, 83, 84, 85, 86 which are self-excited vibration preventing members extend in the radial direction D between the outer wall cooling liner 17 and the inner wall cooling liner 19, and It is a plate member that blocks a part of the liquid level of the coolant in the gap with the wall cooling liner 19. As a result, the shielding of sloshing generated in the inner annulus 27 can be made uneven in the circumferential direction C or the radial direction D of the inner annulus 27.

  The self-excited vibration preventing member is a sloshing shielding plate 86, and the length in the radial direction D is preferably equal to the length of the inner annulus 27. As a result, the sloshing in the radial direction D is unlikely to periodically change, and the possibility that the outer wall cooling liner 17 or the inner wall cooling liner 19 causes periodic self-excited vibration can be reduced.

  The reactor vessel 4 of the present embodiment includes an outer cylinder 13 of the reactor vessel, and an outer wall cooling liner 17 that the coolant level in the gap between the outer vessel 13 overflows to the inside of the reactor vessel 4 and gets over. And an inner wall cooling liner 19 in which the overflowing coolant forms a return channel with the outer wall cooling liner 17, and the coolant level in the gap between the outer wall cooling liner 17 and the inner wall cooling liner 19. One of the sloshing shielding plates 81, 82, 83, 84, 85, 86 which is a self-excited vibration preventing member that blocks at least a part of the

  The sloshing generated in the inner annulus 27 is shielded, and the sloshing energy can be attenuated. As a result, the possibility that the outer wall cold liner 17 or the inner wall cold liner 19 causes periodic self-excited vibration can be reduced.

  The self-excited vibration preventing member in the first, second, third, and fourth embodiments described above can be implemented in combination.

1, 2, 3, 4 Reactor vessel 11 Core structure 13 Outer cylinder 17 Outer wall cooling liner 19 Inner wall cooling liner 21 Lower plenum 23 Lower intermediate plenum 25 Outer annulus 27 Inner annulus 31 Upper intermediate plenum 33 Upper plenum 41 Inlet flow Hall 42 Outlet flow hole 51, 52, 53 Self-excited vibration preventing member 65, 66, 67, 68, 69 Convex part (self-excited vibration preventing member)
71, 72, 73 Perforated plate (self-excited vibration preventing member)
81, 82, 83, 84, 85, 86 Sloshing shielding plate (self-excited vibration preventing member)
F1, F2, F3, F4, F5, F6, F7, F11 Coolant flow path

Claims (7)

A reactor vessel outer cylinder,
An outer wall cooling liner that is disposed inside the outer cylinder, and the coolant in the gap between the structure and the outer cylinder overflows over the inside of the reactor vessel;
An inner wall cooling liner that forms a return channel for returning the coolant that has overflowed with the outer wall cooling liner to the gap;
Self-excited vibration prevention that is in contact with a part of the coolant that has overflowed or a part of the coolant in the gap between the outer wall cooling liner and the inner wall cooling liner and that is arranged in the circumferential direction of the outer cylinder And a member,
The nuclear reactor vessel characterized in that the arrangement of the self-excited vibration preventing members includes an irregular arrangement in the circumferential direction of the outer cylinder.   The nuclear reactor vessel according to claim 1, wherein a part of the overflowed coolant collides with the self-excited vibration preventing member.   The self-excited vibration preventing member is a plurality of convex portions formed at a part of an end portion of the outer wall cooling liner on a side where the coolant overflows, and the coolant overflowing from between the convex portions is the The reactor vessel according to claim 1, which falls to the inside of the reactor vessel.   2. The nuclear reactor vessel according to claim 1, wherein the self-excited vibration preventing member is a member having a through hole disposed in the vicinity of a liquid level of the coolant in a gap between the outer wall cooling liner and the inner wall cooling liner. .   2. The nuclear reactor vessel according to claim 1, wherein the self-excited vibration preventing member is a member having a through hole that covers a liquid surface of the coolant in a gap between the outer wall cooling liner and the inner wall cooling liner.   The self-excited vibration preventing member extends in a radial direction between the outer wall cooling liner and the inner wall cooling liner, and a liquid level of the coolant in a gap between the outer wall cooling liner and the inner wall cooling liner. The reactor vessel according to claim 1, wherein the reactor vessel is a plate member that partially shields the reactor vessel. A reactor vessel outer cylinder,
An outer wall cooling liner disposed on the inner side of the outer cylinder, the coolant level in the gap between the structure and the outer cylinder overflowing into the inner side of the reactor vessel;
An inner wall cooling liner that forms a return flow path for returning the coolant that has overflowed with the outer wall cooling liner to the gap,
A reactor vessel having a self-excited vibration preventing member that blocks at least a part of a liquid level of the coolant in a gap between the outer wall cooling liner and the inner wall cooling liner.

Images