Fast Reactor Equipment

Abstract

A fast reactor device is provided, comprising: a stack container support neck; a rotating shield plug, the rotating shield plug is arranged on the stack container support neck; and a plug protection sleeve, the plug protection sleeve is located outside the rotating shield plug and is arranged on the stack container support neck, the plug protection sleeve at least comprises a first sleeve and a second sleeve, in the axial direction of the rotating shield plug, the second sleeve is farther away from the stack container support neck than the first sleeve, wherein a first gap is formed between the first sleeve and the rotating shield plug, and the projection of the second sleeve along the axial direction of the rotating shield plug covers the projection of the first gap along the axial direction of the rotating shield plug. The fast reactor device of the present invention can effectively prevent the sodium vapor in the reactor from being deposited on the rotating shield plug, reduce the temperature of the large bearing mounting surface of the plug, and at the same time make the reactor hall in the conventional working area.

Description

Technical Field

[0001] The present disclosure relates to the field of nuclear reaction, and in particular to a fast reactor device. Background Art

[0002] Since the coolant of fast reactor equipment is chemically active, closed refueling is required, so a rotating shield plug installed on the reactor vessel support neck is required, which places high demands on the rotation and positioning of the rotating shield plug. Sodium vapor deposition in the reactor will affect the function of the rotating shield plug. In addition, in order to install the rotating shield plug, it is necessary to open a hole in the reactor top cover, that is, the reactor vessel support neck. Due to the large amount of radiation in the reactor, such as gamma radiation and neutron radiation, and the large amount of heat released during the nuclear reaction, higher requirements are placed on the safety protection of fast reactor equipment. Summary of the invention

[0003] In one aspect, a fast reactor device is provided, comprising: a stack container support neck; a rotating shield plug, the rotating shield plug being arranged on the stack container support neck; and a cock protection sleeve, the cock protection sleeve being located on the outside of the rotating shield plug and being arranged on the stack container support neck, the cock protection sleeve comprising at least a first sleeve and a second sleeve, wherein in the axial direction of the rotating shield plug, the second sleeve is farther away from the stack container support neck than the first sleeve, wherein a first gap is formed between the first sleeve and the rotating shield plug, and a projection of the second sleeve along the axial direction of the rotating shield plug covers a projection of the first gap along the axial direction of the rotating shield plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] Other objects and advantages of the present disclosure will be apparent from the following description of the present disclosure with reference to the accompanying drawings, and will help to have a comprehensive understanding of the present disclosure.

[0005] Figure 1 The schematic diagram of the structure of the fast reactor device according to the embodiment of the present disclosure is shown;

[0006] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0007] Figure 3 is a diagram schematically showing the installation position of the tap protection sleeve according to an embodiment of the present disclosure; and

[0008] Figure 4 Schematic diagram of a plug protection sleeve according to an embodiment of the present disclosure.

[0009] Figure markings: 1-stack container support neck, 2-rotating shielding plug, 3-cock protection sleeve, 4-first sleeve, 5-second sleeve, 6-first gap, 7-third sleeve, 8-fourth sleeve, 9-third gap, 10-second inner surface, 11-first inner surface, 12-fourth inner surface, 13-third inner surface, 14-second outer surface, 15-first outer surface, 16-third outer surface, 17-fourth outer surface, 18-second gap, 19-fourth gap, 20-inner shielding of the stack. DETAILED DESCRIPTION

[0010] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0011] Unless otherwise defined, the technical terms or scientific terms used in this disclosure should be understood by ordinary technicians in the field. "First", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0012] In this document, unless otherwise specified, directional terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing the present disclosure, and do not indicate or imply that the device, element or component referred to must have a specific orientation, be constructed or operate in a specific orientation. It should be understood that when the absolute position of the described object changes, the relative positional relationship they represent may also change accordingly. Therefore, these directional terms should not be understood as limiting the present disclosure.

[0013] Since the coolant of fast reactor equipment is mostly metallic sodium, which has active chemical properties, closed refueling is required. In order to facilitate the refueling of fast reactor equipment, a rotating shield plug is installed on the support neck of the reactor vessel of the fast reactor equipment, and the refueling in the reactor is realized by rotating and positioning the rotating shield plug. However, since there is a large amount of sodium vapor in the reactor, the deposition of sodium vapor on the rotating shield plug will greatly affect the normal function of the rotating shield plug, so it is necessary to prevent the deposition of sodium vapor. In addition, in order to install the rotating shield plug, it is necessary to open a hole in the top cover of the reactor, that is, the support neck of the reactor vessel, and install the rotating shield plug on the large bearing. Since there is a large amount of irradiation in the reactor, such as gamma irradiation and neutron irradiation, and a large amount of heat will be released during the nuclear reaction, the temperature of the large bearing mounting surface of the rotating shield plug needs to be lower than 120°C, and it is necessary to ensure that the radioactivity will not overflow into the reactor hall during normal operation of the reactor.

[0014] Figure 1 The structural diagram of a fast reactor device according to an embodiment of the present disclosure is schematically shown. Figure 2 yes Figure 1 Enlarged view of point A in the middle. Figure 3 Schematically shows the installation position of the tap protection sleeve according to an embodiment of the present disclosure. Figure 4 Schematic diagram of a plug protection sleeve according to an embodiment of the present disclosure.

[0015] like Figures 1 to 4 As shown, an embodiment of the present disclosure provides a fast reactor device, comprising: a stack container support neck 1; a rotating shield plug 2, the rotating shield plug 2 being arranged on the stack container support neck 1; and a cock protection sleeve 3, the cock protection sleeve 3 being located outside the rotating shield plug 2 and arranged on the stack container support neck 1, the cock protection sleeve 3 at least comprising a first sleeve 4 and a second sleeve 5, in the axial direction of the rotating shield plug 2, the second sleeve 5 is farther away from the stack container support neck 1 than the first sleeve 4, wherein a first gap 6 is formed between the first sleeve 4 and the rotating shield plug 2, and the projection of the second sleeve 5 along the axial direction of the rotating shield plug 2 covers the projection of the first gap 6 along the axial direction of the rotating shield plug 2. It should be noted that the cock protection sleeve 3 is arranged above the sodium liquid level inside the fast reactor device. Due to the presence of the second sleeve 5, the sodium vapor coming from below can be blocked from entering the first gap 6, thereby preventing the deposition of sodium vapor on the rotating shield plug 2. Therefore, sodium vapor can be blocked by increasing the thickness of the second sleeve 5 or providing a blocking device on the inner surface of the second sleeve 5 . Any design that can prevent sodium vapor from entering the first gap 6 by the second sleeve 5 is acceptable, and the present disclosure does not limit this.

[0016] It should be noted that the plug protection sleeve 3 is arranged on the reactor vessel support neck 1 of the fast reactor equipment. During installation, a hole needs to be opened on the reactor vessel support neck 1 to install the rotary shield plug 2 on the large bearing. Due to the presence of the plug protection sleeve 3, the heat in the reactor is transferred to the reactor vessel support neck 1 through the plug protection sleeve 3, and the temperature is reduced, so that the temperature of the large bearing mounting surface of the rotary shield plug 2 is lower than 120°C, which provides a guarantee for the safe operation of the rotary shield plug 2. In addition, the plug protection sleeve 3 can also prevent sodium vapor from condensing on the bearing and tin-bismuth alloy of the rotary shield plug 2, which provides a guarantee for the rotation of the rotary shield plug 2.

[0017] like Figures 1 to 4 As shown, in the embodiment of the present disclosure, the cock protection sleeve 3 further includes a third sleeve 7 and a fourth sleeve 8, and in the axial direction of the rotating shield plug 2, the fourth sleeve 8 is farther away from the stack container support neck 1 than the third sleeve 7, wherein a third gap 9 is formed between the third sleeve 7 and the rotating shield plug 2, and the projection of the fourth sleeve 8 along the axial direction of the rotating shield plug 2 covers the projection of the third gap 9 along the axial direction of the rotating shield plug 2. It should be noted that, due to the presence of the fourth sleeve 8, the sodium vapor coming from below can be further blocked from entering the third gap 9, thereby preventing the sodium vapor from being deposited on the rotating shield plug 2. Similarly, the sodium vapor can be blocked by increasing the thickness of the fourth sleeve 8 or by providing a blocking device on the inner surface of the fourth sleeve 8. Any design that can enable the fourth sleeve 8 to block the sodium vapor from entering the third gap 9 is acceptable, and the present disclosure does not limit this.

[0018] like Figures 1 to 4 As shown, in the embodiment of the present disclosure, the second inner surface 10 of the second sleeve 5 of the cock protection sleeve 3 is closer to the rotary shield plug than the first inner surface 11 of the first sleeve 4 in the axial direction perpendicular to the rotary shield plug 2. As a result, the projection of the second sleeve 5 along the axial direction of the rotary shield plug 2 covers the projection of the first gap 6 along the axial direction of the rotary shield plug 2.

[0019] like Figures 1 to 4 As shown, in the embodiment of the present disclosure, the fourth inner surface 12 of the fourth sleeve 8 of the cock protection sleeve 3 is closer to the rotary shield plug 2 than the third inner surface 13 of the third sleeve 7 in the axial direction perpendicular to the rotary shield plug 2. As a result, the projection of the fourth sleeve 8 along the axial direction of the rotary shield plug 2 covers the projection of the third gap 9 along the axial direction of the rotary shield plug 2.

[0020] like Figures 1 to 4As shown, in the embodiment of the present disclosure, the thickness of the second sleeve 5 of the cock protection sleeve 3 in the axial direction perpendicular to the rotary shield plug 2 is greater than the thickness of the first sleeve 4 in the axial direction perpendicular to the rotary shield plug 2; and / or, the thickness of the fourth sleeve 8 of the cock protection sleeve 3 in the axial direction perpendicular to the rotary shield plug 2 is greater than the thickness of the third sleeve 7 in the axial direction perpendicular to the rotary shield plug 2. Therefore, the projection of the second sleeve 5 along the axial direction of the rotary shield plug 2 can further cover the projection of the first gap 6 along the axial direction of the rotary shield plug 2, and the projection of the fourth sleeve 8 along the axial direction of the rotary shield plug 2 can cover the projection of the third gap 9 along the axial direction of the rotary shield plug 2.

[0021] like Figures 1 to 4 As shown, in the embodiment of the present disclosure, the second outer surface 14 of the second sleeve 5 of the tap protection sleeve 3 is closer to the rotary shield plug 2 than the first outer surface 15 of the first sleeve 4 in the axial direction perpendicular to the rotary shield plug 2 .

[0022] like Figures 1 to 4 As shown, in the embodiment of the present disclosure, the third outer surface 16 of the third sleeve 7 of the plug protection sleeve 3 is located in the same plane as the fourth outer surface 17 of the fourth sleeve 8 in the axial direction perpendicular to the rotary shielding plug 2 .

[0023] like Figures 1 to 4 As shown, in the embodiment of the present disclosure, a second gap 18 is formed between the second sleeve 5 and the rotating shield plug 2, and a fourth gap 19 is formed between the fourth sleeve 8 and the rotating shield plug 2, wherein the projections of the second gap 18 and the third gap 9 along the axial direction of the rotating shield plug 2 coincide, the first gap 6 is farther away from the rotating shield plug 2 than the second gap 18 in the axial direction perpendicular to the rotating shield plug 2, and the third gap 9 is farther away from the rotating shield plug 2 than the fourth gap 19 in the direction perpendicular to the rotating shield plug 2. Thus, two-layer blocking can be achieved, and the fourth sleeve 8 and the second sleeve 5 respectively block the sodium vapor, further reducing the deposition of the sodium vapor on the rotating shield plug 2.

[0024] In the embodiment of the present disclosure, the medium in the first gap 6, the second gap 18, the third gap 9 and the fourth gap 19 is argon gas. The presence of argon gas can further prevent sodium vapor from being deposited on the rotating shield plug 2.

[0025] like Figures 1 to 4As shown, in the embodiment of the present disclosure, the fast reactor device further includes an in-pile shield 20, which is located outside the end of the plug protection sleeve 3 away from the reactor vessel support neck 1, and the plug protection sleeve 3, the in-pile shield 20 and the reactor vessel support neck 1 form a closed shielding structure in the axial direction of the rotating shield plug 2. In actual use, the plug protection sleeve 3, the in-pile shield 20 and the reactor vessel support neck 1 have a sufficient steel shielding thickness in the axial direction of the rotating shield plug 2 to form a closed shielding structure, block the radiation in the reactor, and prevent the radiation from leaking out during the operation of the reactor.

[0026] In the embodiment of the present disclosure, the first sleeve 4, the second sleeve 5, the third sleeve 7 and the fourth sleeve 8 are connected together by welding.

[0027] In the embodiment of the present disclosure, the material of the cock protection sleeve 3 is 316H stainless steel. 316H stainless steel is a stainless steel material commonly used in reactors, which can meet the requirements of reactors for material mechanical properties, corrosion resistance, etc.

[0028] The plug protection cover of the disclosed embodiment can effectively prevent the sodium vapor in the reactor from being deposited on the rotating shielding plug. At the same time, the heat insulation function of the plug protection cover makes the temperature of the large bearing mounting surface of the plug lower than 120°C. In addition, it can form a closed biological shielding structure with the in-core shielding and the reactor vessel support neck, so that the reactor hall is in the conventional working area.

[0029] The plug protection cover of the disclosed embodiment was used for the first time in the reactor vessel of China's fast reactor equipment. Through shielding analysis, in the disclosed embodiment, the reactor hall is a conventional working area; through heat transfer analysis, the temperature of the large bearing mounting surface of the plug is lower than the design limit requirement; through the sodium aerosol condensation test, it is verified that the plug protection cover can effectively prevent the deposition of sodium vapor on the plug. Therefore, the plug protection cover of the disclosed embodiment meets the design requirements and can ensure the safety function of the reactor.

[0030] The present disclosure provides important guidance for the design of the cock protection sleeve of large-scale sodium-cooled fast reactor equipment.

[0031] Although some embodiments according to the overall technical concept of the present disclosure have been shown and described, those skilled in the art will appreciate that changes may be made to these embodiments without departing from the principles and spirit of the overall technical concept of the present disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. A fast reactor device, characterized in that: include: Stack container support neck; A rotating shielding plug, the rotating shielding plug being arranged on the stack container support neck; as well as A plug protection sleeve, the plug protection sleeve is located outside the rotating shield plug and is arranged on the stack container support neck, the plug protection sleeve comprises at least a first sleeve and a second sleeve, in the axial direction of the rotating shield plug, the second sleeve is farther away from the stack container support neck than the first sleeve, Wherein, a first gap is formed between the first sleeve and the rotating shield plug, and a projection of the second sleeve along the axial direction of the rotating shield plug covers a projection of the first gap along the axial direction of the rotating shield plug; The plug protection sleeve further comprises a third sleeve and a fourth sleeve. In the axial direction of the rotary shield plug, the fourth sleeve is further away from the stack container support neck than the third sleeve. Wherein, a third gap is formed between the third sleeve and the rotating shield plug, and the projection of the fourth sleeve along the axial direction of the rotating shield plug covers the projection of the third gap along the axial direction of the rotating shield plug; The first sleeve, the second sleeve, the third sleeve and the fourth sleeve are connected together in sequence by welding; The second sleeve is used to block the sodium vapor coming from below from entering the first gap, so as to prevent the sodium vapor from being deposited on the rotating shielding plug; The fourth sleeve is used to further block the sodium vapor coming from below from entering the third gap, thereby preventing the sodium vapor from being deposited on the rotating shielding plug.

2. The fast reactor device according to claim 1, characterized in that: The second inner surface of the second sleeve of the tap protection sleeve is closer to the rotary shield plug in the axial direction perpendicular to the rotary shield plug than the first inner surface of the first sleeve.

3. The fast reactor device according to claim 1 or 2, characterized in that: The fourth inner surface of the fourth sleeve of the tap protection sleeve is closer to the rotary shield plug than the third inner surface of the third sleeve in the axial direction perpendicular to the rotary shield plug.

4. The fast reactor device according to claim 3, characterized in that: The thickness of the second sleeve of the plug protection sleeve in a direction perpendicular to the axial direction of the rotary shielding plug is greater than the thickness of the first sleeve in a direction perpendicular to the axial direction of the rotary shielding plug; and / or, The thickness of the fourth sleeve of the tap protection sleeve in the direction perpendicular to the axial direction of the rotary shield plug is greater than the thickness of the third sleeve in the direction perpendicular to the axial direction of the rotary shield plug.

5. The fast reactor device according to claim 2, characterized in that: The second outer surface of the second sleeve of the tap protection sleeve is closer to the rotary shield plug in the axial direction perpendicular to the rotary shield plug than the first outer surface of the first sleeve.

6. The fast reactor device according to claim 3, characterized in that: The third outer surface of the third sleeve of the tap protection sleeve is located in the same plane as the fourth outer surface of the fourth sleeve in the axial direction perpendicular to the rotary shielding plug.

7. The fast reactor device according to claim 1, characterized in that: A second gap is formed between the second sleeve and the rotating shield plug, and a fourth gap is formed between the fourth sleeve and the rotating shield plug. Among them, the projections of the second gap and the third gap along the axial direction of the rotating shielding plug coincide, the first gap is farther away from the rotating shielding plug than the second gap in the axial direction perpendicular to the rotating shielding plug, and the third gap is farther away from the rotating shielding plug than the fourth gap in the direction perpendicular to the rotating shielding plug.

8. The fast reactor device according to claim 7, characterized in that: The medium in the first gap, the second gap, the third gap and the fourth gap is argon gas.

9. The fast reactor device according to claim 1, characterized in that: The fast reactor equipment also includes an in-pile shield, which is located outside the end of the plug protection sleeve away from the stack container support neck. The plug protection sleeve, the in-pile shield and the stack container support neck form a closed shielding structure in the axial direction of the rotating shield plug.

10. The fast reactor device according to claim 1, characterized in that: The material of the plug protection sleeve is 316H stainless steel.

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