A fuel assembly channel uranium-graphite nuclear reactor (options)

 

A fuel Assembly channel uranium-graphite nuclear reactor intended for use in the field of nuclear energy. A fuel Assembly is equipped located in the Central hole of the lower shank around a Central rod stepped sleeve. The surface speed of the latter is in contact with the surface of the lower end of the shank. The speaker for the size of the lower shank end of the stepped sleeve interacts with the surface of the end face of the nut when tightening. The Central openings in the upper and lower shanks are shaped profile. Profiles of cross-sections of the end face of the suspension and the stepped sleeve is made of the conditions for azimuth recording suspension and a stepped sleeve relative to the upper and lower shanks. Provides improvement in the build settings. 2 C. and 12 C.p. f-crystals, 9 Il.

The invention relates to nuclear power for a two-beam structures of fuel assemblies, providing the ability to remove the damaged fuel elements and used in RBMK type reactors (reactor high power channel).

The prior art fuel Assembly to the fuel elements, placed in the spacer grids, which are rigidly mounted on the Central frame tube (EN 2072569, G 21 3/00, 27.01.1997). In the known Assembly, the lower shank fixed to the Central rod through the lower mounting means made in the form of screws, are secured to the Central rod. The dismantling of such Assembly involves placing her in the pit of cutting, the separation of the bundles of fuel elements and cutting the bottom of the shank and nut fuel Assembly.

The closest in technical essence and the achieved result to the described heat-generating Assembly is a fuel Assembly channel uranium-graphite nuclear reactor, containing situated in the Central hole of the upper shank suspension, rigidly connected with the Central rod, and the lower shank, a preloaded in the direction of the suspension through the nuts, thread which interacts with mating threads executed on a Central rod passing through the Central hole of the shank (EN 2128375, G 21 3/32, 27.03.1999). In the known construction the lower shank and nut, clamped it, fixed to the Central rod by pins.

Fixing nuts and the lower shank of the pin is carried out sharp. In this case, after replacing the defective fuel element, you need to mount the new Central terminal with the suspension, the lower shank and nut, which increases the cost of Assembly-disassembly. In addition, cutting the lower part of the fuel Assembly involves the use of special tooling, and when the original installation of the Assembly is necessary in the nut, the lower shank and the Central rod to perform hole pins.

Summary of the invention the present invention is the creation and development of the fuel Assembly channel uranium-graphite nuclear reactor with improved parameters.

The solution of this task is possible obtain a technical result, namely, that significantly simplifies the Assembly-disassembly of the fuel Assembly increases the adaptability of its design, reduced range of snap-ins that are used when assembling or disassembling.

These technical results are achieved by the fact that a fuel Assembly channel uranium-graphite nuclear reactor, containing situated in the Central hole of the upper shank suspension, rigidly connected with the Central rod with dressed him bunches t the response thread, executed on a Central rod passing through the Central hole of the lower shank equipped located in the Central hole of the lower shank around a Central rod stepped sleeve, the surface of the tread which comes into contact with the surface of the lower end of the shank, and the speaker for the size of the lower shank end of the stepped sleeve interacts with the surface of the end face of the nut when tightening, and the center hole in the top and bottom and the shanks have shaped profile, and the profiles of cross-sections of the end face of the suspension and a stepped sleeve, located in the Central holes of the upper and lower shanks respectively performed under condition of providing azimuthal recording suspension and a stepped sleeve relative to the upper and lower shanks.

The second option run a fuel Assembly channel uranium-graphite nuclear reactor, containing situated in the Central hole of the upper shank suspension, rigidly connected with the Central rod passing through the Central hole of the lower shank, bogatogo in the direction of the suspension by means of nuts threaded, provided with a cylindrical obtenu, limited emphasis made on the terminal part of the free end of the Central rod, and is located in the Central hole of the lower shank around a Central rod stepped sleeve, the surface of the tread which comes into contact with the surface of the lower end of the shank, and the speaker for the size of the lower shank end of the stepped sleeve interacts with the surface of the end face of the nut when tightening through the interaction of the threads of the nut with mating threads made on the outer surface of the cylindrical fairing, with the Central openings in the upper and lower shanks are shaped profile, and the profiles of cross-sections of the end face of the suspension and a stepped sleeve, located in the Central holes of the upper and lower shanks respectively performed under condition of providing azimuthal recording suspension and a stepped sleeve relative to the upper and lower shanks.

A distinctive feature of the present invention is that a fuel Assembly is equipped located in the Central hole of the lower shank around a Central rod stepped sleeve, the surface of the tread which comes into contact with poverhnostnom with the surface of the end face of the nut when tightening. As a result, the preload of the lower shank in the direction of the suspension through the intermediate element is a stepped sleeve. To prevent rotation of the elements of the fuel Assembly relative to each other when tightening nuts have Central openings in the upper and lower shanks to perform with a shaped profile and the profiles of cross-sections of the end face of the suspension and a stepped sleeve located in the Central holes of the upper and lower shanks respectively to perform under condition of providing azimuthal recording suspension and a stepped sleeve relative to the upper and lower shanks.

The second option distinctive feature is that the fuel Assembly is provided with a cylindrical Radome mounted around the free end of the Central rod with the possibility of longitudinal movement limited by a stop made on the terminal part of the free end of the Central rod. Nut when it interacts with mating threads made on the outer surface of the cylindrical fairing that eliminates the need for threads on the Central rod.

In addition, the fence can be made in the form of various rod or in the form of a fork, placed in grooves made on the terminal part of the free end of the Central rod.

It is advisable nut to do with obitaemoj skirt for coverage extending beyond the dimensions of the shank portion of the stepped sleeve that will securely stop nut.

Although it is preferred that the Central openings in the upper and lower shanks had shaped profile, in particular an oval shape corresponding to the profile cross-sections of the end face of the suspension and a stepped sleeve located in the Central holes of the upper and lower shanks respectively.

The shaped profile of the Central holes of the upper and lower shanks can be formed by means of an intermediate sleeve.

The list of drawings In Fig.1 shows the upper part of the fuel Assembly of Fig.2 shows a section a-a of Fig.3 shows the section b-B the lower part of the fuel Assembly of Fig.4 shows a cross-section In the lower part of the fuel Assembly of Fig.3 shows a view of the City, in Fig.6 shows a section d-D of the second variant implementation of the lower part of the fuel Assembly of Fig.7 shows the cross-section e-E of the second variant of execution of the fuel Assembly of Fig. 8 shows a view W of Fig.9 shows the plug.

Information nuclear reactor contains located in the Central hole of the upper shank 1 suspension 2. Suspension 2 is rigidly connected to the Central rod 3, for example by means of a pin. The lower shank 5 of the fuel Assembly is preloaded in the direction of the suspension 2 by means of nuts 6. In the first embodiment, the threaded nut 6 interacts with mating threads executed on the Central rod 3 passing through the Central hole of the lower shank 5. A fuel Assembly is equipped located in the Central hole of the lower shank 5 around the Central rod 3 speed hub 7. The surface speed of the sleeve 7 is in contact with the surface of the lower end of the shank 5, and the speaker for the size of the lower shank end of the stepped sleeve interacts with the surface of the end face of the nut 6 when it is screwing up. The center hole in the top of the shank 1 and the lower shank 5 are shaped profile, and the profiles 8 cross-sections of the end face of the suspension and a stepped sleeve located in the Central holes of the upper and lower shanks respectively made of the conditions for fixing the suspension and stepped sleeve relative to both the shank (see Fig.2). It is obvious that the shapes of the Central holes of both shanks can be the most different shapes - oval, RMS is moscovice. Profiles 8 cross-sections of the suspension and a stepped sleeve can be performed with suitable shaped profiles of the Central apertures oval, square, triangle, etc. Profiles 8 cross-sections of the end face of the suspension and a stepped sleeve can be performed not appropriate shaped profiles of the Central hole, but with the azimuth of fixing the suspension and speed of the sleeve relative to the upper and lower shanks, for example, square and oval.

According to the second variant of the fuel Assembly is provided with a cylindrical Radome 9 mounted around the free end of the Central rod 3 with the possibility of longitudinal movement limited by a stop made on the terminal part of the free end of the Central rod. The fence can be made in any known way, for example in the form of a fork 10 that are installed in the slots of the Central rod or in the form of a split ring. Thread the nut 6 interacts with mating threads made on the outer surface of the cylindrical fairing 9. I.e. the second option on the free end of the Central rod 3, the thread is missing. To prevent loss of the plug 10 from the slots, it is advisable in the fairing 9 to perform the ring is disgust spontaneous unscrewing the nut 6 has obitaemyy skirt 12, made with coverage extending beyond the dimensions of the shank portion of the stepped sleeve. Assembly-disassembly of the fuel assemblies is obvious from its construction and is in the Assembly of its elements by a simple snap. The outer surface of the protruding part of the stepped sleeve is advisable to make the hexagon shape that will allow you to record key when tightening the nut 6 to the required torque.

Claims

1. A fuel Assembly channel uranium-graphite nuclear reactor, containing situated in the Central hole of the upper shank suspension, rigidly connected with the Central rod with put on him bundles of fuel rods, and the lower shank, a preloaded in the direction of the suspension through the nuts, thread which interacts with a mating thread, made in the Central rod, characterized in that provided is located in the Central hole of the lower shank around a Central rod stepped sleeve, the surface of the tread which comes into contact with the surface of the lower end of the shank, and the speaker for the size of the lower shank end of the stepped sleeve interacts with poverhnosti profile and profiles of cross-sections of the end face of the suspension and a stepped sleeve located in the Central holes of the upper and lower shafts, respectively, performed under condition of providing azimuthal recording suspension and a stepped sleeve relative to the upper and lower shanks.

2. A fuel Assembly under item 1, characterized in that the nut has a skirt made with coverage extending beyond the dimensions of the shank portion of the stepped sleeve.

3. A fuel Assembly under item 1 or 2, characterized in that the Central openings in the upper and lower shanks are shaped profile corresponding to the profile cross-sections of the end face of the suspension and a stepped sleeve located in the Central holes of the upper and lower shanks, respectively.

4. A fuel Assembly according to any one of paragraphs.1-3, characterized in that the Central openings in the upper and lower shanks are shaped profile in the form of an oval.

5. A fuel Assembly according to any one of paragraphs.1-4, characterized in that the profiles of cross-sections of the suspension and a stepped sleeve located in the Central holes of the upper and lower shafts, respectively, made in the form of an oval.

6. Teplovydelyayuschie formed through the intermediate sleeve.

7. A fuel Assembly channel uranium-graphite nuclear reactor, containing situated in the Central hole of the upper shank suspension, rigidly connected with the Central rod passing through the Central hole of the lower shank, bogatogo in the direction of the suspension by means of nuts threaded, characterized in that it is equipped with a cylindrical Radome mounted around the free end of the Central rod with the possibility of longitudinal movement limited by a stop made on the terminal part of the free end of the Central rod, and is located in the Central hole of the lower shank around a Central rod stepped sleeve, the surface of the tread which comes into contact with the surface of the lower end of the shank, and the speaker for the size of the lower shank end of the stepped sleeve interacts with the surface of the end face of the nut when tightening through interaction thread nut with mating threads made on the outer surface of the cylindrical fairing, with the Central openings in the upper and lower shanks are shaped profile, and the profiles of cross-sections of the end face of the suspension and a stepped sleeve, rapolechenie azimuth recording suspension and a stepped sleeve relative to the upper and lower shanks.

8. A fuel Assembly under item 7, characterized in that the emphasis is made in the form of a split ring, is placed in an annular groove made on the terminal part of the free end of the Central rod.

9. A fuel Assembly under item 7, characterized in that the emphasis is made in the form of a fork placed in grooves made on the terminal part of the free end of the Central rod.

10. A fuel Assembly according to any one of paragraphs.7-9, characterized in that the nut has a skirt made with coverage extending beyond the dimensions of the shank portion of the stepped sleeve.

11. A fuel Assembly according to any one of paragraphs.7-10, characterized in that the Central openings in the upper and lower shanks are shaped profile corresponding to the profile cross-sections of the end face of the suspension and a stepped sleeve located in the Central holes of the upper and lower shanks, respectively.

12. A fuel Assembly according to any one of paragraphs.7-11, characterized in that the Central openings in the upper and lower shanks are shaped profile in the form of an oval.

13. A fuel Assembly according to any one of paragraphs.7-12, characterized in that the profiles of cross-sections of the suspension and a stepped sleeve located in Centralia Assembly according to any one of paragraphs.7-13, characterized in that the shaped profile of the Central holes of the upper and lower shanks formed through the intermediate sleeve.

 

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