JPH0968583A - Nuclear reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the effective capacity of a containment vessel, and downsize the vessel by the portion corresponding to this increase of the effective capacity. SOLUTION: This nuclear reactor has a reactor vessel 1, a watertight vessel 5 for reactor vessel formed of a vessel body 5a for covering the body part 1a of the reactor vessel 1 and a vessel upper lid 5b installed so as to cover the upper mirror part 1c of the reactor vessel 1 and be removable from the vessel body 5a, and a housing vessel 2 capable of housing the reactor vessel 1 including the watertight vessel 5 for reactor vessel, and storing water 3 in the inner part. A pressurizer system piping 7 extended from the reactor vessel 1 into the housing vessel 2 is constituted in such a manner that the through part piping 7b of the pressurizer system piping 7 is vertically extended through the vessel upper lid 5b of the watertight vessel 5 for reactor vessel.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a nuclear reactor.

[0002]

2. Description of the Related Art In recent years, research and development of a nuclear reactor mounted on a large vessel have been conducted.

FIG. 6 and FIG. 7 show an example of a nuclear reactor mounted on a large vessel.
Reactor vessel 1 with control rod and steam generator inside
A containment vessel 2 for storing the reactor vessel 1 and capable of storing water 3 as a coolant and a shielding material, and surrounding a portion of the reactor vessel 1 in which the core fuel assembly is located, and It has a shielding structure 4 for supporting the reactor vessel 1 against the inner bottom of the containment vessel 2, and a watertight container 5 for the reactor vessel provided inside the containment vessel 2 so as to surround the reactor vessel 1. ing.

The reactor vessel 1 has a cylindrical body 1a extending vertically and a lower mirror portion 1b connected to the lower end of the body 1a.
An upper mirror portion 1c that is detachably bolted to the upper end of the body portion 1a, and a support portion 1d that protrudes obliquely downward from a vertical middle portion of the outer peripheral surface of the body portion 1a. There is.

The containment vessel 2 has a cylindrical body portion 2a extending vertically and having an inner diameter larger than the outer diameter of the body portion 1a of the reactor vessel 1, and a lower mirror portion 2b connected to the lower end of the body portion 2a. ,
The upper mirror portion 2c is detachably bolted to the upper end of the body portion 2a.

The shield structure 4 has an outer diameter smaller than the inner diameter of the body 2 a of the containment vessel 2 and the body 1 of the reactor vessel 1.
A recessed portion 4 into which the lower end portion of a and the lower mirror portion 1b are loosely fitted from above.
a shielding portion 4b having a formed therein, and a supporting portion 4c protruding obliquely downward from an intermediate portion in the vertical direction of the outer peripheral surface of the shielding portion 4b.
And

The support portion 4c of the shield structure 4 is provided with a shield portion 4b.
Is fixed to the inner bottom surface of the lower mirror portion 2b of the storage container 2 so as to be coaxial with the storage container 2.

On the other hand, the support portion 1 of the reactor vessel 1 described above
In FIG. 4d, the lower end portion of the body portion 1a and the lower mirror portion 1b are the shielding structures 4
It is fixed to the upper surface of the shielding portion 4b of the shielding structure 4 so as to be loosely fitted coaxially with the concave portion 4a.

The watertight container 5 for a reactor is a container body 5a.
And a container upper lid 5b.

The vessel body 5a is a body portion 1a of the reactor vessel 1.
It has a surrounding shape so that a void is formed.

The vessel upper lid 5b is the upper mirror portion 1 of the reactor vessel 1.
c is covered with the upper mirror portion 1c so that a space is formed, and is bolted to the upper end of the container body 5a in a removable manner.

In the upper mirror portion 1c of the reactor vessel 1 described above,
A pressurizer system pipe 6 penetrating the container body 5a of the watertight container 5 for a nuclear reactor is connected.

As shown in FIG. 7, the pressurizer system pipe 6 has one end welded and fixed to the upper mirror portion 1c of the reactor vessel 1 and extends from the upper mirror portion 1c in an obliquely upward end pipe 6a.
An intermediate pipe 6b, one end of which is flange-connected to the other end of the end pipe 6a, and which bends downward toward the side surface of the reactor vessel 1, and one end of which is connected to the other end of the intermediate pipe 6b It has a penetrating pipe 6c which is bent substantially horizontally outward in the radial direction of the reactor vessel 1 and penetrates the vessel body 5a of the watertight vessel 5 for a nuclear reactor vessel so as to keep watertightness.

In the nuclear reactor shown in FIGS. 6 and 7, the water phase 3 enclosed in the boundary formed by the watertight container 5 for the reactor vessel is formed, and the water 3 stored in the containment vessel 2 is formed. However, it does not touch the reactor vessel 1.

Further, the inside of the boundary formed of the watertight container 5 for a reactor vessel is filled with nitrogen gas.

[0016]

In a nuclear reactor mounted on a ship, it is desirable to make the containment vessel 2 as small as possible in order to ensure that the ship has a sufficient loading volume.

However, if the containment vessel 2 is simply downsized, it becomes impossible to store the water 3 corresponding to the core fuel assembly in the reactor vessel 1 inside the containment vessel 2.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a nuclear reactor capable of storing water required in a containment vessel and reducing the size of the containment vessel. I am trying.

[0019]

In order to achieve the above object, in the present invention, a reactor vessel in which a core fuel assembly is arranged, a body of the reactor vessel, a vessel body and a reactor vessel are provided. A watertight container for a reactor vessel, which comprises a vessel upper cover that covers the upper mirror part and is detachably attached to the vessel body, and a reactor vessel including the watertight container for the reactor vessel. In a nuclear reactor having a containment vessel capable of storing water as a shielding material, a pipe extending from the reactor vessel to the inside of the containment vessel is vertically penetrated through the upper lid of the watertight container for the reactor vessel. It is configured to do.

In the nuclear reactor of the present invention, a pipe extending from the reactor vessel to the inside of the containment vessel is vertically penetrated through the upper lid of the watertight container for the reactor vessel to increase the effective volume of the containment vessel.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first example of an embodiment of a nuclear reactor of the present invention. In the drawings, the parts denoted by the same reference numerals as those shown in FIGS. 6 and 7 are the same. Is represented.

In the reactor shown in FIGS. 1 to 3, a pressurizer system pipe 7 penetrating a container upper lid 5b of a watertight container 5 for a reactor vessel is connected to the upper mirror portion 1c of the reactor vessel 1.

As shown in FIGS. 1 and 2, one end of the pressurizer system pipe 7 is welded and fixed to the upper mirror portion 1c of the reactor vessel 1 and is bent substantially horizontally in the lateral direction of the reactor vessel 1. An end pipe 7a and one end of which is flange-connected to the other end of the end pipe 7a, and a penetrating penetrating through the container upper lid 5b of the watertight container 5 for a reactor vessel after being bent in a hairpin shape and then bent substantially vertically upward. The end pipe 7a includes a partial pipe 7b and an intermediate pipe 7c, one end of which is flange-connected to the other end of the penetrating pipe 7b and which bends downward to a side surface of the watertight container 5 for a reactor vessel. Further, the bent portion of the penetrating pipe 7b forms an expansion structure against thermal expansion.

As shown in FIGS. 1 and 3, a tubular stand member 8a, an annular mounting seat 8b, and a penetrating pipe 7b are provided in a penetrating portion of the penetrating pipe 7b in the watertight container 5 for a nuclear reactor. There is provided a penetrating structure 8 having a closing member 8c that is externally fitted to.

The stand member 8a is arranged on the upper surface of the container upper lid 5b so as to surround the opening 5c formed in the container upper lid 5b for inserting the penetrating pipe 7b, and the lower end is welded and fixed to the container upper lid 5b. Has been done.

The mounting seat 8b has an inner diameter D3 smaller than the inner diameter D1 of the opening 5c.

The mounting seat 8b is coaxially arranged on the upper end of the stand member 8a and welded and fixed to the stand member 8a.

The closing member 8c has an outer diameter D2 which is smaller than the inner diameter D1 of the opening 5c and larger than the inner diameter D3 of the mounting seat 8b.

The closing member 8c is externally fitted to the penetrating pipe 7b and welded to the penetrating pipe 7b, and the upper surface of the closing member 8c surrounds the penetrating pipe 7b in the circumferential direction. The seal member 8d is fitted to the.

Further, the closing member 8c is fixed to the mounting seat 8b by a plurality of bolts 8e which coaxially abut the lower surface of the mounting seat 8b and extend downward from the upper side of the mounting seat 8b.

On the other hand, the outer diameter D4 of the flange member 7d for flange-connecting the through pipe 7b to the intermediate pipe 7c is the inner diameter D3 of the mounting seat 8b and the opening 5c described above.
The inner diameter D1 is smaller than any of the inner diameters D1.

That is, the inner diameter D1 of the opening 5c, the outer diameter D2 of the closing member 8c, the inner diameter D3 of the mounting seat 8b, and the outer diameter D4 of the flange member 7d are formed so that the relationship of the following equation (1) is established. Has been done.

[0034]

[Equation 1] D1> D2> D3> D4 ... (1)

In the nuclear reactor shown in FIGS. 1 to 3 described above, when the watertight container 5 for the reactor vessel is opened, after the bolting of the upper mirror portion 2c to the body portion 2a of the containment vessel 2 is released, The upper mirror portion 2c is lifted up substantially vertically by a lifting means such as a crane to remove the upper mirror portion 2c of the storage container 2 from the body portion 2a.

Next, the flange connection between the intermediate pipe 7c forming the pressurizer system pipe 7 and the penetrating pipe 7b is released, and the mounting seat 8b of the penetrating structure 8 and the closing member 8 by the bolt 8e.
Release the connection with c.

Further, after the bolt fastening of the container upper lid 5b to the container body 5a of the watertight container 5 for a nuclear reactor is released,
The vessel upper lid 5b is lifted up substantially vertically by a lifting means such as a crane to remove the vessel upper lid 5b of the watertight vessel 5 for a reactor vessel from the vessel body 5a.

At this time, the outer diameter D4 of the flange member 7d of the penetrating pipe 7b is smaller than either the inner diameter D3 of the mounting seat 8b of the penetrating structure 8 or the inner diameter D1 of the opening 5c of the container top lid 5b. Therefore, the container upper lid 5b can be easily lifted.

Further, in the reactor shown in FIGS. 1 to 3, since the penetrating pipe 7b forming the pressurizer system pipe 7 penetrates the container upper lid 5b of the watertight container 5 for a reactor container substantially vertically, The outer diameter of the upper end portion of the container body 5a of the watertight container 5 for a nuclear reactor can be made equal to the outer diameter below it.

Therefore, as shown in FIGS. 6 and 7, the outer diameter of the upper end of the vessel body 5a of the watertight vessel 5 for a nuclear reactor vessel is provided in order to penetrate the penetrating portion piping 6c forming the pressurizer system piping 6 substantially horizontally. Comparing the reactor formed larger than the lower part with the reactor shown in FIGS. 1 to 3, if the internal shape of the containment vessel 2 is the same, the reactor shown in FIGS. Compared with the reactor shown in FIGS. 6 and 7, the effective volume of the containment vessel 2 is relatively increased, and more water 3 can be stored inside the containment vessel 2.

As described above, in the nuclear reactor shown in FIGS. 1 to 3, since the effective volume of the containment vessel 2 can be increased, the containment vessel 2 is increased by the amount corresponding to the increase of the effective volume.
It is possible to reduce the size.

FIGS. 4 and 5 show a second example of the embodiment of the nuclear reactor of the present invention, in which FIGS. 1 to 3 and 6 are shown.
Also, the parts denoted by the same reference numerals as those shown in FIG. 7 represent the same things.

In the reactor shown in FIGS. 4 and 5, the pressurizer system piping 9 penetrating the upper container cover 5b of the watertight container 5 for a reactor vessel is connected to the upper mirror portion 1c of the reactor vessel 1.

As shown in FIG. 4, the pressurizer system pipe 9 has one end welded and fixed to the upper mirror portion 1c of the reactor vessel 1 and penetrates the vessel upper lid 5b of the watertight vessel 5 for the reactor vessel substantially vertically. It has a penetrating pipe 9a and an intermediate pipe 9b, one end of which is flange-connected to the other end of the penetrating pipe 9a and which bends downward toward the side surface of the watertight container 5 for a reactor vessel.

As shown in FIGS. 4 and 5, a cylindrical stand member 10a, an annular mounting seat 10b, and a penetrating seat 10b are provided in the penetrating portion of the penetrating pipe 9a in the watertight container 5 for a nuclear reactor.
A penetrating structure 10 having bellows 10e having annular connecting members 10c and 10d provided at both ends is provided.

The stand member 10a is arranged on the upper surface of the container upper lid 5b so as to surround the opening 5c formed in the container upper lid 5b for inserting the penetrating pipe 9a, and the lower end thereof is welded and fixed to the container upper lid 5b. Has been done.

The mounting seat 10b has an inner diameter D1 of the opening 5c.
Has an inner diameter D5 approximately equal to.

This mounting seat 10b is used for the stand member 10
A seal member 10f is coaxially arranged at the upper end of a and is welded and fixed to the stand member 10a, and a seal member 10f is fitted on the upper surface of the mounting seat 10b so as to surround the through pipe 9a in the circumferential direction.

Connecting members 10c, 10d and bellows 10
The effective inner diameter of e is substantially equal to the inner diameter D5 of the mounting seat 10b.

The connecting member 10c located on the lower side is fixed to the mounting seat 10b by a plurality of bolts 10g so that the bellows 10e surrounds the through pipe 9a coaxially, and the connecting member 10d located on the upper side. A seal member 10h is fitted on the upper surface of the so as to surround the through pipe 9a in the circumferential direction, and the bellows 10e forms a structure corresponding to thermal expansion.

On the other hand, the outer diameter D6 of the flange member 9c for flange-connecting the through pipe 9a to the intermediate pipe 9b is the inner diameter D5 of the mounting seat 10b and the opening 5 described above.
A seal member 9f is fitted on the upper surface of the flange member 9c so as to be positioned coaxially with the through pipe 9a.

That is, the inner diameter D1 of the opening 5c, the inner diameter D5 of the mounting seat 10b, and the outer diameter D6 of the flange member 9c are formed so as to satisfy the following equations (2) and (3). .

[0053]

[Equation 2] D1> D6 ... (2) D5> D6 ... (3)

Further, the outer diameter of the flange member 9d for flange-connecting the intermediate pipe 9b to the penetrating pipe 9a is equal to the outer diameter of the connecting member 10d located on the upper side.

The above-mentioned flange member 9c is used for the through pipe 9
a and a plurality of bolts 9 so that the intermediate portion piping 9b communicates with each other.
It is fixed to the flange member 9d by e, and the connecting member 10d is fixed to the flange member 9d by a plurality of bolts 10i.

In the reactor shown in FIGS. 4 and 5 described above, when the watertight container 5 for the reactor vessel is opened, after the bolting of the upper mirror portion 2c to the body portion 2a of the containment vessel 2 is released, The upper mirror portion 2c is lifted up substantially vertically by a lifting means such as a crane to remove the upper mirror portion 2c of the storage container 2 from the body portion 2a.

Next, the pressurizer system piping 9 with the bolt 9e
The flange member 9d of the intermediate pipe 9b and the flange member 9c of the through pipe 9a are released from each other, and the bolt 10
The fastening of the flange member 9d and the connecting member 10d of the penetration structure 10 by i is released.

Further, after the bolt fastening of the container upper lid 5b to the container body 5a of the watertight container 5 for a nuclear reactor is released,
The vessel upper lid 5b is lifted up substantially vertically by a lifting means such as a crane to remove the vessel upper lid 5b of the watertight vessel 5 for a reactor vessel from the vessel body 5a.

At this time, the outer diameter D6 of the flange member 9c of the penetrating pipe 9a is smaller than either the inner diameter D5 of the mounting seat 10b of the penetrating structure 10 or the inner diameter D1 of the opening 5c of the container top lid 5b. Therefore, the container upper lid 5b can be easily lifted.

Further, in the reactor shown in FIGS. 4 and 5, the penetrating pipe 9a forming the pressurizer system pipe 9 penetrates the container upper lid 5b of the watertight container 5 for the reactor container substantially vertically. The outer diameter of the upper end portion of the container body 5a of the watertight container 5 for a nuclear reactor can be made equal to the outer diameter below it.

Therefore, as shown in FIGS. 6 and 7, the outer diameter of the upper end portion of the vessel body 5a of the watertight vessel 5 for a reactor vessel is provided so as to penetrate the penetrating portion pipe 6c forming the pressurizer system pipe 6 substantially horizontally. 4 and FIG. 5 are compared with each other, the reactor shown in FIG. 4 and FIG. As compared with the reactor shown in FIGS. 6 and 7, the effective volume of the containment vessel 2 is relatively increased, and more water 3 can be stored inside the containment vessel 2.

As described above, in the nuclear reactor shown in FIGS. 4 and 5, the effective volume of the containment vessel 2 can be increased, so that the containment vessel 2 can be increased by an amount corresponding to the increase of the effective volume.
It is possible to reduce the size.

The nuclear reactor of the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0064]

As described above, the nuclear reactor of the present invention can exhibit various excellent effects as described below.

(1) Since the pipe extending from the reactor vessel to the inside of the containment vessel is vertically penetrated through the upper lid of the watertight container for the reactor vessel, the effective volume of the containment vessel can be increased. It is possible to reduce the size of the storage container by an amount corresponding to this increase in effective volume.

(2) Since the containment vessel can be downsized, it is possible to equip a ship equipped with a nuclear reactor with a sufficient volume of cargo to be loaded.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a first example of an embodiment of a nuclear reactor of the present invention.

FIG. 2 is a conceptual view of the pressurizer system piping shown in FIG. 1 viewed from a direction different by 90 °.

FIG. 3 is a conceptual diagram of the penetrating structure shown in FIG.

FIG. 4 is a conceptual diagram showing a second example of the embodiment of the nuclear reactor of the present invention.

5 is a conceptual diagram of the penetrating structure shown in FIG.

FIG. 6 is a conceptual diagram showing the overall structure of an example of a conventional nuclear reactor.

FIG. 7 is a conceptual diagram showing a main part in an example of a conventional nuclear reactor.

[Explanation of symbols]

 1 Reactor Vessel 1a Body 1c Upper Mirror 2 Containment Vessel 5 Watertight Vessel for Nuclear Reactor Vessel 5a Vessel Main Body 5b Vessel Top Lid 7,9 Pressurizer System Pipe 7b, 9a Penetration Pipe

Claims (1)

[Claims] 1. A reactor vessel in which a core fuel assembly is arranged, a vessel body for covering a body of the reactor vessel and an upper mirror section of the reactor vessel and detachably mounted on the vessel body. A watertight container for a reactor vessel, which includes a container upper lid, and a containment vessel that stores the reactor vessel including the watertight container for the reactor vessel and that can store water as a coolant and a shielding material therein. In the nuclear reactor, a pipe extending from the reactor vessel to the inside of the containment vessel is configured such that the pipe vertically penetrates the upper lid of the watertight container for the reactor vessel.