Pressurised water reactor

FIELD: physics, atomic power.

SUBSTANCE: invention relates to pressurised water reactors. The reactor comprises a reactor pressure vessel (11), a cylindrical core basket (13), a lower core support plate (17) and a cylindrical permeable membrane (31). A downcomer (14) is formed between the inner lateral surface of the vessel (11) and the cylindrical core basket (13). The lower core support plate (17) has a large number of openings (80) for an ascending stream. The cylindrical permeable membrane (31) divides the lower chamber (16) and the lower part of the downcomer (14), and has a large number of openings (83) for an incoming stream, which serve as channels for passing the stream from the lower part of the downcomer (14) into the lower chamber (16). The openings (83) for the incoming stream on the side where said openings for the input stream exit into the lower chamber (16) are inclined upwards towards the lower chamber (16).

EFFECT: high uniformity of the flow of coolant in the core.

13 cl, 12 dwg

 

The technical field to which the invention relates

The invention relates to pressurized water nuclear reactor.

The level of technology

In a well-known traditional water-moderated reactors are described, for example, in the publication laid patent application of Japan No. 08-62372 (document D1), the coolant flows into the high pressure reactor vessel through the inlet nozzles and passes down into the drop chamber of the reactor, which is an annular channel formed between the inner surface of the reactor vessel high pressure and the outer surface of the basket of the reactor core. The coolant which has reached the lower end of the drop camera passes through the inlet of the lower chamber, and then reversing the direction of movement in the lower chamber to upward, passes through a large number of holes to guide the flow from the bottom up, and reaches the reactor core, which includes the fuel assemblies. As you progress through the coolant up in the core, its temperature increases further, the coolant passes through the upper chamber and out of the pressurized water reactor through the discharge pipes. The brine withdrawn from pressurized water reactor through the discharge pipes, is sent to the steam generator.

The path of flow from the inlet to the reactor react�RA designed to the maximum extent possible to eliminate the factor that causes the appearance of the vortex or collision of the stream, and thereby to make the coolant flow coming in each fuel Assembly, steadily evenly distributed. For this reason, in the lower chamber is set, for example, a disk-shaped plate for the suppression of the vortex.

The coolant will be described later with reference to Fig.11, which illustrates the area around the entrance of the lower chamber in the famous traditional water-moderated reactor. At that Fig.11 shows a partial view in vertical section showing only the left side of the vertical section of the lower part of the high pressure casing of conventional pressurized water reactor.

Thread 21 of the coolant flowing down in the surge chamber 14 of the reactor, passes through the inlet 15 of the lower chamber and flows into the lower chamber 16. Reducing the width of the inlet 15 into the lower chamber 16 to increase the speed of the coolant flowing into the lower chamber 16, which increases the inertia of the flow. Having a high inertia, which flows into the lower chamber 16 in a lateral direction of the high-speed stream 22 is first lowered down along the inner wall surface of the lower portion 81 that forms the lower chamber 16 of the reactor vessel under high pressure and then the flow is directed toward the center of the bottom of the core, as shown in Fig.11. Such a character of the flow causes the flow rate of the dispensed fluid that passes up through the lower support plate 17 of the active zone, is increased in the Central part 23. From all fuel assemblies placed above the lower support plate 17 of the core, the fuel assemblies located near the city center, tend to perceive a greater flow rate compared to the assemblies located in the peripheral area.

To reduce the uneven distribution of coolant flow in the reactor core can be installed permeable cylindrical partition 31 containing a large number of holes 83 for influent flow (radially directed through holes) installed at the inlet 15 into the lower chamber, as shown in Fig.12. Cylindrical permeable wall 31 is usually attached to a lower section 81 under pressure of the reactor vessel by means of a support element 33. Although between the lower base plate 17 of the reactor core and a cylindrical permeable partition wall 31 there is a small gap 32, the upper corner portion 43 of the entrance of the gap 32 and the lower corner plot 44 are at the same level in the radial direction relative to each other, so that the step between the corner teaching�worry-beads is formed.

In that case, if it has the specified permeable cylindrical partition 31, stream 21 flowing in the surge chamber 14 down at the entrance 15 to the lower chamber rotates inward in the radial direction, passes through the holes 83 for the filling flow formed in a cylindrical permeable partition wall 31, and enters the lower chamber 16 in the form of a flowing in a radial flow direction 41. When passing through the holes 83 for the inflow of the stream available in cylindrical permeable partition wall 31, the flow spreads out and moves in the horizontal direction in the vicinity of the lower support plate 17 of the active zone, so that the aspiration flow 22 in the direction of the Central part 23, as shown in Fig.11, becomes difficult, which prevents the increase of the flow rate of the coolant supplied to the fuel assemblies located near the Central station.

Disclosure of the invention

The problem solved by the present invention

As shown in Fig.12, stream 42 flowing from the upper holes 83 for the filling of the flow in the above-mentioned known permeable cylindrical partition 31, is held in the transverse direction in the vicinity of the lower ends of the openings 80 for upward flow, located on the peripheral area 24 of the lower support plate 17 is actively� zone of the reactor. In this case, to the lower ends of the holes 80 for upward flow, disposed on the peripheral section 24, due to the Venturi effect suction is applied force. More specifically, it creates stress, which leads to the downward displacement of the fluid in the holes 80 for the rising tide. As noted above, a disadvantage of the known cylindrical permeable partition 31 is that it reduces the amount of coolant supplied to the fuel assemblies located in the peripheral area.

The present invention was made to solve the above problems, and an object of the invention is the reduction in water-moderated reactor of the uneven flow distribution of the refrigerant flow to the fuel assemblies in the radial direction.

To solve the problem in accordance with an embodiment of one aspect of the present invention proposes a water-water reactor, comprising: a cylindrical reactor vessel under pressure, the axis of which passes in a vertical direction, wherein the reactor vessel under pressure contains the lower part, protruding downward, and the inlet nozzle is attached to the side surface of the housing; a cylindrical basket reactor core installed in the reactor vessel under pressure so as to form an annular downcomer to�measure between a given basket of the active zone and the inner surface of the reactor vessel under pressure; the active zone from the basket, the active zone; the lower support plate of the reactor core mounted below the active zone so that it passes horizontally across the bottom part of the basket of the active zone and has a large number of openings for the upward flow; and a permeable cylindrical wall, placed as a partition in contact with the lower part of the building, between the lower chamber and the lower section movable camera and having a large number of holes for flowing stream, each of which serves as a channel to move the thread from the bottom of the surge chamber to the lower chamber, wherein, at least some of the holes for flowing the stream from the side on which they enter into the lower chamber, made with a slope at least up towards the bottom of the camera.

In accordance with an embodiment of another aspect of the present invention proposes a water-water reactor, comprising: a cylindrical reactor vessel under pressure, the axis of which passes in a vertical direction, wherein the reactor vessel under pressure contains the lower part, protruding downward, and the inlet nozzle is attached to the side surface of the housing; a cylindrical basket reactor core installed in the reactor vessel under pressure that�, to form an annular downcomer chamber between said basket of the active zone and the inner surface of the reactor vessel under pressure; active zone being in the basket of the core; the lower support plate of the reactor core mounted below the active zone so that it passes horizontally across the bottom part of the basket of the active zone and has a large number of openings for the upward flow; and a permeable cylindrical wall, placed as a partition in contact with the lower part of the building, between the lower chamber and the lower section movable camera and having a large number of holes for flowing stream, each of which serves as a channel to move the thread from the bottom of the surge chamber to the lower chamber, the cylindrical permeable partition wall formed with a step protruding movable in the direction of the camera and passing toward the periphery.

According to the embodiment of another aspect of the present invention proposes a water-water reactor, comprising: a cylindrical reactor vessel under pressure, the axis of which passes in a vertical direction, wherein the reactor vessel under pressure contains the lower part, protruding downward, and the inlet nozzle is attached to the side surface of the housing; C�cylindrical basket reactor core, installed in the reactor vessel under pressure so as to form an annular downcomer chamber between said basket of the active zone and the inner surface of the reactor vessel under pressure; active zone being in the basket of the core; the lower support plate of the reactor core mounted below the active zone so that it passes horizontally across the bottom part of the basket of the active zone and has a large number of openings for the upward flow; and a permeable cylindrical wall, placed as a partition in contact with the lower section of the housing, between the lower chamber and the lower section movable camera and having a large number of holes for flowing stream, each of which serves as a channel to move the thread from the bottom of the surge chamber to the lower chamber, in the horizontal direction passes the annular gap so that it serves as a channel for the passage of thread from the bottom of the surge chamber to the lower chamber, formed between the lower base plate of the active zone and the upper end section of the cylindrical permeable partition, and at least the side surface of the gap from the bottom of the camera is tilted up towards the bottom of the camera.

According to another embodiment of the present aspect of the invent�of proposed water-moderated reactor, comprising: a cylindrical reactor vessel under pressure, the axis of which passes in a vertical direction, wherein the reactor vessel under pressure contains the lower part, protruding downward, and the inlet nozzle is attached to the side surface of the housing; a cylindrical basket reactor core installed in the reactor vessel under pressure so as to form an annular downcomer chamber between said basket of the active zone and the inner surface of the reactor vessel under pressure; active zone being in the basket of the core; the lower support plate of the reactor core mounted below the active zone, that it extends horizontally across the bottom part of the basket of the active zone and has a large number of openings for the upward flow; and a permeable cylindrical wall, placed as a partition in contact with the lower part of the building, between the lower chamber and the lower section movable camera and having a large number of holes for flowing stream, each of which serves as a channel to move the thread from the bottom of the surge chamber to the lower chamber, and wherein in the horizontal direction passes the annular gap so that it serves to channel the flow from the bottom of the surge chamber to the lower chamber, � it is formed between the lower base plate of the active zone and the upper end section of the cylindrical permeable walls, and the outer periphery of the upper end area of the cylindrical permeable septum protrudes relative to the outer periphery of the lower end portion of the bottom support plate of the core.

Advantages of the invention

In accordance with the present invention in water-moderated reactor, it becomes possible to reduce the uneven distribution of the flow rate of the refrigerant supplied to the fuel assemblies in the radial direction.

Brief description of the drawings

Fig.1 is a partial view in vertical section showing only the left side of the vertical section of the lower part of the high pressure body of water-cooled reactor, corresponding to the first embodiment.

Fig.2 is a view in vertical section showing the inner part of the reactor vessel under pressure of a first embodiment of the pressurized water reactor according to the present invention.

Fig.3 is an enlarged view in vertical section showing only the left side of the vertical section of the cylindrical permeable septum, shown in Fig.1.

Fig.4 is a detail view in vertical section showing only the left side of the vertical section of the lower part of the reactor vessel under pressure to the second embodiment of the pressurized water reactor according to the present invention.

Fig.5 is an enlarged view in vertical section, displays only the left side of the vertical section of the cylindrical permeable septum, shown in Fig.4.

Fig.6 is an enlarged view in vertical section showing only the left side of the vertical section of the lower portion of the cylindrical permeable partition to the third embodiment of the water-water reactor in accordance with the present invention.

Fig.7 is a detail view in vertical section showing only the left side of the vertical section of the lower part of the reactor vessel under pressure to the fourth embodiment of the pressurized water reactor according to the present invention.

Fig.8 is an enlarged view in vertical section showing only the left side of the vertical section of the cylindrical permeable septum, shown in Fig.7.

Fig.9 is a detail view in vertical section showing only the left side of the vertical section of the lower part of the reactor vessel under pressure to the fifth embodiment of the pressurized water reactor according to the present invention.

Fig.10 is a detail view in vertical section showing only the left side of the vertical section around a cylindrical permeable partition to the sixth embodiment of the pressurized water reactor according to the present invention.

Fig.11 is a detail view in vertical section, from�rajasi only the left side of the vertical section of the lower part of the reactor vessel under pressure for a known pressurized water reactor.

Fig.12 is a detail view in vertical section showing only the left side of the vertical section of the lower part of the reactor vessel under pressure for a known pressurized water reactor illustrating an example different from Fig.11.

Embodiments for carrying out the invention

The embodiment of the pressurized water reactor according to the present invention will be described below with reference to the accompanying drawings.

The first incarnation

Fig.1 shows a partial view in vertical section showing only the left side of the vertical section of the lower part under high pressure in the reactor, corresponding to the first embodiment of the pressurized water reactor according to the present invention. Fig.2 shows a view in vertical section showing the inner part of the reactor vessel under pressure of a first embodiment of the pressurized water reactor according to the present invention. Fig.3 presents an enlarged view in vertical section showing only the left side of the vertical section of the cylindrical permeable septum, shown in Fig.1.

Water-moderated reactor, corresponding to the first embodiment, comprises a housing 11 of the reactor under pressure, the basket 13 reactor core disposed within the housing 11 of the reactor under pressure, and an active� zone 18, located in the basket 13. In the active zone 18 contains a large number of fuel assemblies.

The housing 11 of the reactor pressure has the shape of a circular cylinder whose axis runs in the vertical direction. The lower part 81 of the specified housing 11 of the reactor pressure acts downwards and has a hemispherical shape. In this lower part of the housing formed by the lower chamber 16. The upper body portion 11 of the reactor pressure attached openable cover 88.

Basket 13 active area has the shape of a circular cylinder whose axis runs in the vertical direction. Between the outer wall of the basket 13 of the active zone and the inner wall of the housing 11 of the reactor under pressure is formed by an annular surge chamber 14.

To the shell side of the reactor 11 under pressure attached inlet tube 12 and outlet connections 50. Above the basket 13 active zone formed by the upper camera 19. To the lower end portion of the basket 13 active zone is attached a horizontal lower support plate 17 active zones having the shape of a disk so that it closes below the specified lower end portion of the basket 13. While in the lower support plate 17 of the active zone is made of a large number of holes 80 for upward flow of coolant.

In lower chamber 16 is disc-shaped PL�TA 51, the vast majority vortex formation in the flow, designed to provide stabilization and uniformity of coolant flow which passes through a hole 80 for upward flow in the lower support plate 17 of the active zone and enters the fuel assemblies. Fig.1 disc-shaped plate 51, shown in Fig.2, not shown.

The lower part of the dipleg chamber 14 serves as the entrance 15 to the lower chamber through which the heat carrier flowing down in the surge chamber 14, flows into the lower chamber 16. At the entrance 15 to the lower chamber is placed a permeable partition wall 31 in the form of a circular cylinder. Permeable cylindrical partition 31 is supported from below by the lower section 81 of the housing 11 of the reactor under pressure through an annular support member 33. Cylindrical permeable partition wall 31 is placed below the lower support plate 17 of the active zone and along its outer periphery. In a cylindrical permeable partition wall 31 is made of a large number of holes 83 for inflowing stream.

Between the lower surface of the lower support plate 17 of the active zone, in the vicinity of its external periphery, and the upper end of the cylindrical permeable partition 31 is formed an annular gap 32.

Each of the holes 83 for flowing stream in the middle of the curved section, and there is a difference between the slope�mi side surface of the holes from the side of the surge chamber 14 (the outer side, side inlet) and the side surface from the lower chamber 16 (the inner side, outlet side flow). In the example illustrated in Fig.3, each hole 83 has a configuration in which a side surface of the holes from the side of the surge chamber 14 extends horizontally, and from the lower chamber 16 continues upward at an angle θ in the direction of the lower chamber 16.

In the first embodiment, the configuration described above, the coolant flows into the housing 11 of the reactor under pressure through an inlet 12 and flows downwardly in the surge chamber 14. The coolant which has reached the lower end of the movable camera is fed to the input 15 of the lower chamber, meaning it passes through the holes 83 for the filling flow in a cylindrical permeable partition wall 31 through the annular gap 32 and enters the lower chamber. After that in the lower chamber 16, the fluid changes direction to an upward flow, passes through the holes 80 for upward flow in the lower support plate 17 of the active zone and reaches the active zone 18 of the reactor. The temperature of the coolant increases as it moves upward in the active area 18, then the coolant passes through the upper chamber 19 and out of the housing 11 of the reactor under high pressure through the discharge pipes 50. The coolant, which is outside the building�and 11 of the reactor under high pressure through the discharge pipes 50, is sent to a steam generator which is not shown in the figures.

In accordance with the present invention in water-moderated reactor, the uneven distribution of the flow rate of the coolant supplied to the fuel assemblies in the radial direction can be reduced.

In the present embodiment, each of the holes 83 for the filling flow in a cylindrical permeable partition wall 31 is held up at an angle 9 from the outlet side of the flow, i.e., from the lower chamber 16. Thus, in the lower chamber 16, the flow of the coolant that has passed through the holes 83 for influent flow is directed upwards to the center of the lower chamber 16. This allows fluid to easily pass into the holes 80 for upward flow, located in the peripheral area 24, with the aforementioned Venturi effect is not evident, and as a result it becomes possible to reduce the decrease in the flow rate of the refrigerant supplied to the fuel assemblies located in the peripheral area.

In addition, according to the present invention each of the holes 83 for the filling flow in a cylindrical permeable partition wall 31 is held in the horizontal direction from the entrance side of the flow, i.e., from the surge chamber 14, and therefore, the coolant flows more smoothly than in the case where the holes 83 for inflowing stream have inclination �about the entire length of the hole towards the bottom of the chamber 16, and this achieves a reduction in hydraulic pressure losses.

In the process of manufacturing a permeable cylindrical partition 31, when in the cylindrical structural member is drilled, the drill bit is introduced from the outer side (left side in Fig.3) drill horizontally and half the thickness of the septum, and then the drill is injected from above the inner side (right side in Fig.3) inclined and drill the other half of the thickness of the septum. Thus, permeable cylindrical partition 31 can be manufactured easily.

Second embodiment

Fig.4 shows a detail view in vertical section showing only the left side of the vertical section of the lower part of the reactor vessel under pressure to the second embodiment of the pressurized water reactor according to the present invention. Fig.5 shows an enlarged view in vertical section showing only the left side of the vertical section of the cylindrical permeable septum, shown in Fig.4. In these figures, elements identical or similar to the components of the first embodiment denoted by the same reference numbers, and their repeated description will not be repeated here.

According to the second embodiment of the angle of inclination of each of the holes 83 for the filling flow in a cylindrical pronice�th partition 31 from the lower chamber (inner side) is changed in accordance with the height position of each of the holes 83 for inflowing stream. Namely, the angle of the upper hole 83 for the filling flow in a cylindrical permeable partition wall 31 on the inner side is equal to θ1, and with the decrease of the height of the opening angle becomes smaller (up to θ2, θ3, ...), and finally, the angle of the bottom of the holes 83 for inflowing stream from the inner side is equal to zero. The rest of the structural performance of the reactor is the same as in the first embodiment.

When you described the constructive implementation of the second embodiment, as can be seen from Fig.4 ways flow path 41, the coolant that has passed through the holes 83 for flowing stream in the upper portion of the cylindrical permeable partitions 31 can easily flow into the lower ends of the holes 80 for upward flow, located in the peripheral area 24 of the lower support plate, and the coolant that has passed through the holes 83 for inflowing stream, located in the lower part of the septum, may proceed further in the direction of the holes 80 for upward flow near the Central part 23. Due to the choice of this manner inclination angles corresponding holes 83 for inflowing stream, it becomes possible to reduce the decrease of coolant flow rate supplied to the fuel assemblies located in the peripheral area, and ETS�AMB uniform distribution of flow rate, entering the active zone.

The third incarnation

Fig.6 presents an enlarged view in vertical section showing only the left side of the vertical section of the lower portion of the cylindrical permeable partition to the third embodiment of the water-water reactor in accordance with the present invention. The third embodiment is a modification of the second embodiment, and therefore, elements identical or similar elements of the third embodiment denoted by the same reference numbers as for the second embodiment, and their repeated description will not be repeated here.

According to the third embodiment on the surface of the permeable partition from the drop chamber 14, i.e. from the outer side surface of the cylindrical permeable partition 31 has a stepped surface 91 substantially constant height. In the example illustrated in Fig.6, the lower boundary of the upper hole 83 for inflowing stream and a stepped surface 91 is designed so that they are in height at the same level with each other. The rest of the design implementation is the same as in the second embodiment.

With this structure, the considered embodiment, if the portion of the stream flowing down in the surge chamber 14, is faced with serving a stepped surface 91, as shown in Fig. the current line 92, this part of the flow is directed into the upper hole 83 for inflowing stream. As described above, due to the structural embodiment with the location of the lower boundary of the upper hole 83 for flowing the stream and stepped surface 91 at the same level in height ensure smooth flow direction to the top hole 83 for inflowing stream. Thus, due to the presence of the stepped surface 91 can be directed more coolant flow to the upper holes 83 for influent flow compared to the constructive execution without forming a stepped surface 91.

It was found that the greater the width of the stepped surface 91, the greater the effect of increasing the amount of fluid that can be directed into the upper hole 83 for flowing stream, and that if the width of the stepped surface is less than 20% of the diameter of each of holes 83 for inflowing stream, this effect is limited. Thus, the height of the stepped surface is preferably a value equal to or exceeding 20% of the diameter of the hole.

In addition, according to the present invention, the holes 83 for inflowing stream have the same configuration, from the viewpoint of hole shapes, with holes 83 for flowing stream in the second�the polishing, it allows not only to increase the amount of coolant supplied to the fuel assemblies located in the peripheral area, but also to provide a flexible increase/decrease of coolant flow rate at predetermined positions in the radial direction.

The fourth incarnation

Fig.7 shows a detail view in vertical section showing only the left side of the vertical section of the lower part of the reactor vessel under pressure to the fourth embodiment of the pressurized water reactor according to the present invention. Fig.8 shows an enlarged view in vertical section showing only the left side of the vertical section of the cylindrical permeable septum, shown in Fig.7. When describing the fourth embodiment, elements identical or similar elements of the embodiments discussed above, first to third, designated by the same reference numbers, and their repeated description will not be repeated here.

According to the present embodiment in the vicinity of the external periphery of the lower support plate 17 of the active zone are annular protrusion 85, which protrudes downward. The upper end surface 72 of the cylindrical permeable partition 31 is turned to the lower end surface of the annular protrusion 85, wherein between said surfaces 72 and 85 obrazovatelnoi the gap 32. Part of the upper end surface 72 of the cylindrical permeable septum 31 located closer to the lower chamber 16, is made with a slope up to the side of the lower chamber 16. Accordingly, a portion of the lower end surface of the annular protrusion 85, which is near the bottom of chamber 16, is also made with a slope up to the side of the lower chamber 16. As a result, the gap 32 is in the vertical direction is essentially constant along its length.

In accordance with this embodiment, all the holes 83 for the filling flow in a cylindrical permeable partition wall 31 are held in a straight horizontal direction as in the conventional device shown in Fig.12.

In the present embodiment, the portion of the gap 32 located near the bottom of chamber 16 is tilted toward the lower chamber 16, so that the thread 71 of the coolant flowing in the direction of the holes 82 for upward flow in the lower support plate 17 of the active zone, located on the peripheral area 24 becomes uniform. In addition, the presence of the annular protrusion 85 in the lower support plate 17 of the active zone leads to the fact that the gap 32 in the vertical direction is shifted by some distance down from the input sections, i.e., the lower end portions of the holes 80 for upward flow in the lower support plate 17 of the core. As a result�e attenuated Venturi effect, due to the transverse flow of the coolant that has passed through the gap 32 and received in the lower chamber 16. This leads to the acceleration of the coolant flow is directed to the apertures 80 for upward flow in the lower support plate 17 of the active zone located on the peripheral area 24.

The fifth incarnation

Fig.9 shows a detail view in vertical section showing only the left side of the vertical section of the lower part of the reactor vessel under pressure to the fifth embodiment of the pressurized water reactor according to the present invention.

The fifth embodiment is a modification of the fourth embodiment, and therefore, elements identical or similar to the elements discussed above fourth embodiment, denoted by reference numbers identical with the fourth embodiment, and their repeated description will not be repeated here.

In the above-described embodiments, the first through fourth cylindrical permeable partition 31 is supported by the lower part 81 of the housing 11 of the reactor by means of an intermediate supporting element 33. In the fifth embodiment the upper surface of the permeable cylindrical partition 31 is attached to the lower surface of the lower support plate 17 of the active zone and held her down. When fixing the septum surface 31 of the upper end of the cylindrical inner and outer�tion permeable partition 31 is lifted up in various discrete points on the height of the gap 32 and are welded with butt weld to the contact areas of the lower support plate 17 of the core.

When the above-described design the implementation of the present embodiment inaccuracy in regard to the height of the gap 32 is reduced, which allows the effect described for the fourth embodiment, which reduces the decrease of coolant flow rate supplied to the fuel assemblies placed in the peripheral area.

The sixth incarnation

Fig.10 shows a detail view in vertical section showing only the left side of the vertical section around a cylindrical permeable partition to the sixth embodiment of the pressurized water reactor according to the present invention.

The sixth embodiment is a modification of the fourth embodiment, and therefore, elements identical or similar to the elements discussed above fourth embodiment denoted by the same reference numbers, and their repeated description will not be repeated here.

In the present embodiment of the corner section 44 of the entrance gap on the lower section of the entry clearance acts in the direction of the surge chamber 14 (the outer side in the radial direction) relative to the angular portion 43 located on the upper portion of the entrance of the gap 32. Thus, on the side of the inlet flow into the gap 32 formed by the protruding portion 74 with the upper surface of constant height. Other design elements that made�, as in the fourth embodiment.

When you described the constructive execution of the considered embodiment the portion of the stream 21 flowing down in the surge chamber 14, is faced with a protruding section 74, and the resulting stream is directed into the gap 32. Thus, in the gap 32 can be directed more coolant flow rate as compared to the case in which the protruding section is missing.

It was found that the greater the width of the ledge, the more specified the effect of increasing the amount of coolant. In addition, it was found that if the width of the stepped surface is less than 20% of the height of the gap, this effect is limited. Thus, the width of the ledge is preferably equal to or is more than 20% of the height of the gap. By an appropriate choice of the width of the protrusion in the design of the reactor it is possible to appropriately control the amount of flow directed to the fuel assemblies located in the peripheral area.

Other incarnations

In the first embodiment (Fig.3) each of the holes 83 for the filling flow in permeable cylindrical partition 31 from the surge chamber 14 extends in the horizontal direction. However, alternatively, each of the holes 83 for the filling flow in permeable cylindrical partition 31 from the drop �im 14 can be performed with the upward slope in the direction of the lower chamber 16, provided that the angle of the hole (the hole axis) of the movable camera is smaller than the angle of inclination of the hole from the lower chamber 16. As a further alternative, each of the holes 83 for inflowing stream from the surge chamber 14 may have a slope down toward the lower chamber 16.

In addition, in the first embodiment for each of the holes 83 for flowing stream there is no need to run with a bend in the middle part, provided that they are tilted up towards the lower chamber 16.

In the third embodiment (Fig.6) a stepped surface is provided only in the top hole 83 for inflowing stream. However, alternatively, a stepped surface may be in a different place. According to another alternative, a stepped surface can be achieved in a number of locations along the height of the permeable septum.

The features of the above embodiments can be combined.

For example, in the third embodiment (Fig.6) the angle of inclination of each of the holes 83 for the filling flow in a cylindrical permeable partition wall 81 from the lower chamber 16 (the inner side) is changed depending on the position and the height of each of the holes 83 for the flowing stream, as in the second embodiment (Fig.5). However, alternatively, the angle NAC�it all hole 83 for the filling flow in a cylindrical permeable partition wall 81 from the lower chamber 16, as in the first embodiment (Fig.3) may be constant regardless of the position of the height of the walls. According to another alternative, each of the holes 83 for the filling flow in a cylindrical permeable partition wall 81 from the lower chamber 16 can be held horizontally.

In embodiments of the fourth through sixth each of the holes 83 for flowing stream passes horizontally, as in the known solution (Fig.12). However, if alternatively, each of the holes 83 for the filling thread is made with a slope, as in any of embodiments one through three, can be obtained an additional effect.

Although permeable cylindrical partition 31 and the housing 11 of the reactor under pressure in each of the embodiments discussed above have the form of a circular cylinder, they can be made not only in the form of a circular cylinder, and also in the form of a cylinder, the horizontal section of which has the shape of the ellipsoid.

The above-described embodiment of the present invention are only illustrative and do not limit the scope of the present invention. In other various forms can be made new embodiments, and various exceptions (elements), substitutions and alterations can be made without going beyond the scope of the present invention. Discussed embodiments and their modification�ication included in the scope and essence of the present invention and in the attached claims and their equivalents.

Explanation of symbols

11 - the reactor vessel under pressure

12 - inlet

13 - basket reactor core

14 lowering the camera

15 - entrance lower camera

16 - lower camera

17 - bottom base plate of the active zone

18 - active area

19 - top chamber

23 - the Central part of

24 - peripheral area

31 - permeable cylindrical partition

32 - the gap

33 - reference

43 - corner plot

44 - corner plot

50 - outlet

51 is a disk-shaped plate to suppress vortices

72 - the upper end surface

74 a raised plot

80 - the opening for the upward flow

81 lower section

83 - opening for inflowing stream

85 - annular ledge

88 - cover

91 - stage surface

1. Water-water reactor that contains:
a cylindrical reactor vessel under pressure, the axis of which passes in a vertical direction, wherein the reactor vessel under pressure contains the lower part, protruding downward, and the inlet nozzle is attached to the side surface of the housing;
cylindrical basket reactor core installed in the reactor vessel under pressure so as to form an annular downcomer chamber between said basket of the active zone and the inner surface of the reactor vessel under pressure�tion;
active area, located in the basket of the core;
the lower support plate of the reactor core mounted below the active zone so that it passes horizontally across the bottom part of the basket of the active zone and has a large number of openings for the upward flow; and
cylindrical permeable partition, on a partition that is in contact with the lower part of the building, between the lower chamber and the lower section movable camera and having a large number of holes for flowing stream, each of which serves as a channel to move the thread from the bottom of the surge chamber to the lower chamber,
thus, at least some of the holes for flowing the stream from the side on which they enter into the lower chamber, made with a slope at least up towards the bottom of the camera.

2. Water-water reactor under pressure according to claim 1, wherein the slope of at least some of the openings for the upward flow varies in their middle portion so that the side on which they enter into the lower chamber, they tilted up towards the bottom of the camera more than by where they come in and lowering the camera.

3. Water-water reactor under pressure according to claim 1 or 2, in which the higher the position of the holes for the inflow poto�and cylindrical permeable wall the more amount of inclination of the holes for the inflow of the flow from the side where the holes go in the lower chamber.

4. Water-water reactor under pressure according to claim 1 or 2, wherein the cylindrical permeable wall has a notch, the protruding movable in the direction of the camera and passing toward the periphery.

5. Water-water reactor that contains:
a cylindrical reactor vessel under pressure, the axis of which passes in a vertical direction, wherein the reactor vessel under pressure contains the lower part, protruding downward, and the inlet nozzle is attached to the side surface of the housing;
cylindrical basket reactor core installed in the reactor vessel under pressure so as to form an annular downcomer chamber between said basket of the active zone and the inner surface of the reactor vessel under pressure;
the active zone in the basket of the core;
the lower support plate of the reactor core mounted below the active zone so that it passes horizontally across the bottom part of the basket of the active zone and which has a great number of holes for the bottom of the stream;
cylindrical permeable partition, on a partition that is in contact with the lower part of the building, between the lower �amaray and a lower section movable camera and having a large number of holes for flowing stream, each of which serves as a channel for the passage of thread from the bottom of the surge chamber to the lower chamber;
the cylindrical permeable partition wall formed with a step protruding movable in the direction of the camera and passing toward the periphery, and the said notch and lower border of the upper holes for flowing stream made so that they are in height at the same level with each other.

6. Water-water reactor under pressure according to claim 5, in which from the sides above and below the specified step is executed a large number of holes for flowing stream.

7. Water-water reactor under pressure according to claim 5, in which at least some of the holes for the filling threads are at the same height with a step.

8. Water-water reactor under pressure according to claim 1 or 2, wherein between the lower base plate of the active zone and the upper end section of the cylindrical permeable septum is formed an annular gap, passing horizontally so that it serves as a channel for the passage of thread from the bottom of the surge chamber to the lower chamber, and at least from the bottom chambers of the specified annular gap is tilted up towards the bottom of the camera.

9. Water-water reactor that contains:
a cylindrical reactor vessel under pressure, the axis of which the passage�t in the vertical direction, the reactor vessel under pressure contains the lower part, protruding downward, and the inlet nozzle is attached to the side surface of the housing;
cylindrical basket reactor core installed in the reactor vessel under pressure so as to form an annular downcomer chamber between said basket of the active zone and the inner surface of the reactor vessel under pressure;
the active zone in the basket of the core;
the lower support plate of the reactor core mounted below the active zone so that it passes horizontally across the bottom part of the basket of the active zone and has a large number of holes for the bottom of the stream;
cylindrical permeable partition, on a partition that is in contact with the lower part of the building, between the lower chamber and the lower section movable camera and having a large number of holes for flowing stream, each of which serves as a channel for the passage of thread from the bottom of the surge chamber to the lower chamber;
in this case, between the lower base plate of the active zone and the upper end section of the cylindrical permeable septum is formed an annular gap, which takes place in the horizontal direction and serves as a channel for the passage of flow from the lower part opusc�second chamber to the lower chamber,
and, at least from the bottom chambers of the specified annular gap is tilted up towards the bottom of the camera.

10. Water-water reactor under pressure according to claim 9, in which the lower support plate active area is formed with an annular protrusion protruding toward the upper end section of the cylindrical permeable septum.

11. Water-water reactor under pressure according to claim 9, in which a cylindrical permeable partition is supported by the lower support plate of the core.

12. Water-water reactor under pressure according to claim 9, in which the outer periphery of the upper end section of the cylindrical permeable septum protrudes relative to the outer periphery of the lower end portion of the bottom support plate of the core.

13. Water-water reactor that contains:
a cylindrical reactor vessel under pressure, the axis of which passes in a vertical direction, wherein the reactor vessel under pressure contains the lower part, protruding downward, and the inlet nozzle is attached to the side surface of the housing;
cylindrical basket reactor core installed in the reactor vessel under pressure so as to form an annular downcomer chamber between said basket of the active zone and the inner surface of the reactor vessel under pressure;
active zone, n�emerging in the basket of the core;
the lower support plate of the reactor core mounted below the active zone so that it passes horizontally across the bottom part of the basket of the active zone and has a large number of holes for the bottom of the stream;
cylindrical permeable partition, on a partition that is in contact with the lower part of the building, between the lower chamber and the lower section movable camera and having a large number of holes for flowing stream, each of which serves as a channel for the passage of thread from the bottom of the surge chamber to the lower chamber;
in this case, between the lower base plate of the active zone and the upper end section of the cylindrical permeable septum is formed an annular gap, which takes place in the horizontal direction and serves as a channel for the passage of thread from the bottom of the surge chamber to the lower chamber, and
the outer periphery of the upper end section of the cylindrical permeable septum protrudes relative to the outer edge of the lower end portion of the bottom support plate of the core.



 

Same patents:

FIELD: power industry.

SUBSTANCE: invention relates to internals of a reactor with pressure water cooling. The reactor includes high-pressure cylindrical housing (1) with inlet branch pipes connected to it; fuel assemblies installed inside high-pressure housing (1); cylindrical core barrel (3) enveloping the fuel assemblies and forming annular downcomer (6) between core barrel (3) and the inner surface of high-pressure housing (1); and radial supports. Radial supports represent supports installed under downcomer (6) at some distance from each other in a circumferential direction, in each of which there is a vertical heat carrier passage duct formed inside it, by means of which positioning of core barrel (3) and high-pressure housing (1) is performed. For example each radial support can have radial key (21) with the heat carrier passage duct and element (40) with a key groove.

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FIELD: power engineering.

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EFFECT: optimum flow hydrodynamics at pressure chamber outlet.

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FIELD: machine building.

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EFFECT: enhanced performances.

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FIELD: power industry.

SUBSTANCE: invention relates to internals of a reactor with pressure water cooling. The reactor includes high-pressure cylindrical housing (1) with inlet branch pipes connected to it; fuel assemblies installed inside high-pressure housing (1); cylindrical core barrel (3) enveloping the fuel assemblies and forming annular downcomer (6) between core barrel (3) and the inner surface of high-pressure housing (1); and radial supports. Radial supports represent supports installed under downcomer (6) at some distance from each other in a circumferential direction, in each of which there is a vertical heat carrier passage duct formed inside it, by means of which positioning of core barrel (3) and high-pressure housing (1) is performed. For example each radial support can have radial key (21) with the heat carrier passage duct and element (40) with a key groove.

EFFECT: uniform distribution of a heat carrier flow in a circumferential direction.

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FIELD: physics, atomic power.

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EFFECT: high uniformity of the flow of coolant in the core.

13 cl, 12 dwg

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