JP5621215B2 - Large aperture hatch - Google Patents

Description

The present invention relates to a large opening hatch provided in a cylindrical vessel such as a reactor containment vessel.

  The nuclear reactor containment vessel is a vessel for preventing the radioactive material inside from leaking to the outside, and is formed in a cylindrical shape whose upper and lower ends are blocked. The reactor containment vessel is provided with a large-diameter hatch for carrying a large-sized device or the like into the reactor containment vessel in addition to a hatch for a person to enter and exit.

  The large-diameter hatch has a cylindrical body portion that extends radially inward and on the side surface of the reactor containment vessel, and a swing bolt at the end of the trunk portion in the reactor containment vessel. It consists of an end plate that is attached and closes the opening of the trunk. The end plate is formed of a cylindrical portion that is formed in a cylindrical shape having the same diameter as that of the barrel portion and is abutted against an end portion of the barrel portion, and a lid portion that is provided so as to close the cylindrical portion on the inner periphery of the cylindrical portion. A ring-shaped seal that is in contact with the tube portion of the end plate is provided at the end of the body portion so that air in the reactor containment vessel does not leak to the outside.

Japanese Patent Laid-Open No. 2002-243484

  By the way, the reactor containment vessel is required to maintain airtightness even in the event of an accident, and is required to maintain airtightness even when the internal pressure becomes as high as about 300 kPa. Further, since the reactor containment vessel is formed in a cylindrical shape whose upper and lower ends are closed as described above, as shown in FIG. 11, the circumferential displacement and the longitudinal direction of the reactor containment vessel when the internal pressure is increased. There is a difference in the direction (axial direction) displacement (circumferential displacement: longitudinal displacement = 2: 1), and the body 5 becomes elliptical. For this reason, in a relatively small reactor containment vessel such as a BWR (boiling water type light water reactor), the barrel 5 and the end plate are attached via a swing bolt to absorb the deviation between the barrel 5 and the end plate. However, if the reactor containment vessel and the large-diameter hatch are large like PWR (Pressurized Water Light Water Reactor), the amount of displacement is large, and there is a risk that the sealing performance between the trunk portion 5 and the cylindrical portion of the end plate may not be ensured. There was a problem that there was.

Accordingly, an object of the present invention is to provide a large opening hatch that can solve the above-mentioned problems, can reduce the deviation in the radial direction and the circumferential direction between the body side and the end plate side, and can ensure the reliability of the sealing performance.

In order to solve the above-described problems, the present invention provides a cylindrical body that forms an opening in the outer periphery of a reactor containment vessel formed in a cylindrical vessel shape and extends radially inward of the reactor containment vessel at the periphery of the opening. the section provided at the distal end of the body portion, the large mounting to the end plate having a lid for closing the opening of the cylindrical portion and having a cylindrical portion having the same diameter as body portion, butting the tube portion to the body portion In the caliber hatch , a regulating member that engages with the other when the internal pressure of the reactor containment vessel rises and the trunk deforms to one of the trunk and the end plate and regulates deformation of the trunk Is provided.

  The restricting member includes a first extension member extending from the inner peripheral side of the trunk portion to the inner peripheral side of the end plate, and the first extension member is spaced apart in the circumferential direction of the reactor containment vessel and It is good to provide in two places of the trunk | drum internal peripheral surface spaced apart in a diameter direction.

  The first extending member facing the inner peripheral surface of the end plate may be formed in an arc shape along the inner peripheral surface of the end plate, and the displacement of the body portion may be transmitted to the inner peripheral surface of the end plate by the surface.

  The restricting member includes the first extending member and a second extending member extending from the inner peripheral side of the end plate to the inner peripheral side of the body portion, and the second extending member is separated in the diameter direction of the end plate. Preferably, the end plate is attached to the barrel so that the second extending members are arranged along the axial direction of the reactor containment vessel.

  The second extending member facing the inner peripheral surface of the body portion may be formed in an arc shape along the inner peripheral surface of the body portion so that the displacement of the body portion is received by the surface.

  The first extension member may be disposed away from the end plate so that the first extension member contacts the end plate when the radial displacement of the body part exceeds a predetermined amount.

  The second extension member may be spaced apart from the barrel so that the second extension member contacts the barrel when the radial displacement of the barrel exceeds a predetermined amount.

  ADVANTAGE OF THE INVENTION According to this invention, the shift | offset | difference of the radial direction of the trunk | drum side and an end plate side and the circumferential direction can be made small, and the reliability of sealing performance can be ensured.

FIG. 1 is a schematic explanatory view of a reactor containment vessel. FIG. 2 is a sectional side view of the main part of FIG. FIG. 3 is an enlarged view of a main part of FIG. FIG. 4 is a bottom view of FIG. FIG. 5 is a rear view of FIG. FIG. 6 is a front view of a large-diameter hatch with the end plate omitted. 7 is a cross-sectional view taken along line AA in FIG. FIG. 8 is a front view of a large-diameter hatch in which an end plate showing another embodiment is omitted. 9 is a cross-sectional view taken along line BB in FIG. FIG. 10 is a cross-sectional view of the main part of a large-diameter hatch showing another embodiment. FIG. 11 is an explanatory view for explaining the deformation of the trunk when the internal pressure of the reactor containment vessel increases.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic explanatory view of a reactor containment vessel as viewed from the front, and FIG. 2 is a side sectional view of the reactor containment vessel and a large-diameter hatch provided in the reactor containment vessel. The right side of the paper is the outside. FIG. 5 is a rear view of the large-diameter hatch as seen from the inside of the reactor containment vessel.

As shown in FIG. 1, a PWR nuclear reactor containment vessel 1 is formed in a cylindrical shape extending vertically and closed at both upper and lower ends, and includes a high-temperature, high-pressure primary coolant. All the primary cooling system equipment (not shown) is accommodated. The reactor containment vessel 1 has a diameter R _V of about 40 m and a height H _V of about 70 m, and is accommodated in the building 2 (see FIG. 2).

  In addition, the reactor containment vessel 1 is provided with a large-diameter hatch 3 for carrying a large-sized device or the like into the reactor containment vessel 1 in addition to a hatch (not shown) for people to enter and exit.

As shown in FIGS. 2 and 5, the large-diameter hatch 3 has a cylindrical shape that forms an opening 4 on the outer periphery of the reactor containment vessel 1 and extends radially inward of the reactor containment vessel 1 at the periphery of the opening 4. A body part 5 is provided, and an end plate 6 is detachably attached to the tip of the body part 5. The trunk portion 5 has an inner diameter _RH of about 5 m, and is provided in the reactor containment vessel 1 by welding. As shown in FIG. 7, a ring-shaped seal 7 is provided at the distal end of the body portion 5 so as to block the space between the end plate 6 in an airtight manner. As shown in FIGS. 2 and 5, the end plate 6 includes a cylindrical portion 8 that has the same inner diameter and outer diameter as the barrel portion 5 and is abutted against the barrel portion 5, and a cylindrical portion that is provided on the inner peripheral side of the barrel portion 8. And a lid portion 9 that closes the central opening of the portion 8. The lid portion 9 is formed in a spherical shape that swells inside the reactor containment vessel 1. The cylindrical portion 8 is fastened to the trunk portion 5 via the swing bolt 10.

  As shown in FIG. 3 and FIG. 4, the swing bolt 10 includes a base portion 11 that protrudes radially outward from the outer peripheral surface of the body portion 5, and a bolt portion that is rotatably provided at one end of the base portion 11. 12, a nut 13 screwed into the bolt portion 12, and a locking portion 14 that protrudes radially outward from the outer peripheral surface of the cylindrical portion 8 and locks the nut 13. When the bolt 5 is deformed, the bolt 12 is rotated with respect to the base 11 to absorb the deformation of the body 5.

  As shown in FIGS. 6 and 7, the trunk portion 5 is provided with a regulating member 15 that regulates deformation of the trunk portion 5 when the internal pressure of the reactor containment vessel 1 rises and the trunk portion 5 is deformed. Yes. The restricting member 15 includes a first extending member 16 for restricting deformation (hereinafter referred to as lateral displacement) of the trunk portion 5 in the circumferential direction of the reactor containment vessel 1.

  The first extending members 16 are provided at two locations on the inner circumferential surface 27 of the trunk portion 5 that are spaced apart in the circumferential direction of the reactor containment vessel 1 and spaced apart in the diameter direction of the trunk portion 5. It extends to the inner peripheral side of the end plate 6. The first extension member 16 includes an arc plate-like first pad 17 welded to the inner peripheral surface 27 of the body portion 5, and a first stopper welded to the inner peripheral surface of the first pad 17 and extending toward the end plate 6 side. 18 and. The first stopper 18 is formed in a circular arc plate shape and welded to the first pad 17, and a first extension 20 extending from the first mounting base 19 toward the end plate 6 in parallel with the body 5. The first contact portion 21 extends from the tip of the first extension portion 20 toward the inner peripheral surface 22 of the cylindrical portion 8. The first contact portion 21 is separated from the cylindrical portion 8 so as to contact the inner peripheral surface 22 of the cylindrical portion 8 when the displacement of the trunk portion 5 in the circumferential direction of the reactor containment vessel 1 exceeds a predetermined amount. Yes. The predetermined amount of lateral displacement is set to a distance that the end plate 6 does not come off the seal 7. Further, the first extension portion 20 and the first contact portion 21 are formed in an arc shape along the inner peripheral surface 22 of the tube portion 8, and the body portion 5 is deformed so that the first contact portion 21 becomes the tube portion 8. The lateral displacement of the body portion 5 is transmitted to the inner peripheral surface 22 of the cylindrical portion 8 by a surface when the inner surface 22 abuts on the inner peripheral surface 22.

  5 and 6, reference numeral 23 denotes a hanging portion that is provided on the end plate 6 and is engaged with the hook 24 when the large-diameter hatch 3 is opened, and 25 is a support that is provided on the end plate 6 so as to extend in the horizontal direction. Reference numeral 26 denotes a guide rail that supports the support frame 25 so as to be slidable up and down.

  Next, the operation of this embodiment will be described.

  When the internal pressure of the reactor containment vessel 1 rises, the trunk portion 5 of the large-diameter hatch 3 is deformed according to the deformation of the reactor containment vessel 1 and expands in the circumferential direction of the reactor containment vessel 1 and shrinks in the axial direction. To do. When the lateral displacement of the trunk 5 is less than the predetermined amount, the first extension member 16 does not interfere with the deformation of the trunk 5 and freely deforms the trunk 5 according to the deformation of the reactor containment vessel 1. . Further, when the lateral displacement of the body portion 5 exceeds a predetermined amount, the first extending member 16 comes into contact with the inner peripheral surface 22 of the tube portion 8 with the deformation of the body portion 5. Thereby, the displacement of the body 5 is transmitted to the end plate 6 and the displacement of the body 5 is suppressed by the rigidity of the end plate 6.

  As described above, the body 5 is provided with the regulating member 15 that engages with the end plate 6 and regulates deformation of the body 5 when the internal pressure of the reactor containment vessel 1 rises and the body 5 is deformed. The deformation of the body part 5 can be suppressed, and the reliability of the sealing performance between the body part 5 and the end plate 6 can be ensured.

  The restricting member 15 includes a first extension member 16 extending from the inner peripheral side of the trunk portion 5 to the inner peripheral side of the end plate 6, and the first extension member 16 is separated in the circumferential direction of the reactor containment vessel 1 and the trunk portion. 5 is provided at two locations on the inner peripheral surface 27 of the body portion that are separated in the diameter direction of the body 5, so that deformation of the body portion 5 can be suppressed with a simple structure without impairing the function of loading the cargo.

  The first extension member 16 facing the inner peripheral surface 22 of the end plate 6, that is, the first extension portion 20 and the first contact portion 21 of the first extension member 16 are formed in an arc shape along the inner peripheral surface 22 of the end plate 6. Since the displacement of the body 5 is transmitted to the inner peripheral surface 22 of the end plate 6 by a surface, it is possible to prevent local concentration of force on the end plate 6 and to prevent deformation of the end plate 6. Can do.

  Since the first extension member 16 is disposed away from the end plate 6 so that the first extension member 16 contacts the end plate 6 when the radial displacement of the body portion 5 exceeds a predetermined amount, the large-diameter hatch 3 is higher than the other parts of the reactor containment vessel 1 and can be prevented from affecting the seismic strength, etc., and can be easily retrofitted to the existing reactor containment vessel 1 as well. .

  In addition, although the regulation member 15 shall consist of the 1st extension member 16, it is not restricted to this. As shown in FIGS. 8 and 9, the restriction member 30 includes the first extension member 16 and a second extension member 31 for restricting deformation of the trunk portion 5 in the axial direction of the reactor containment vessel 1. It may be. Another embodiment will be described. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The second extension members 31 are provided at two locations on the inner peripheral surface 22 that are separated from each other in the diameter direction of the cylindrical portion 8 of the end plate 6, and the end plate 6 includes two second extension members 31 of the reactor containment vessel 1. It is attached to the trunk | drum 5 so that it may line up along an axial direction. The second extending member 31 extends from the inner peripheral side of the end plate 6 to the inner peripheral side of the body unit 5 when the end plate 6 is attached to the body unit 5. The second extending member 31 includes a second arc-plate-shaped pad 32 that is welded to the inner peripheral surface 22 of the cylindrical portion 8 and a second pad that is welded to the inner peripheral surface of the second pad 32 and extends toward the body portion 5 side. It consists of a stopper 33. The second stopper 33 is formed in a circular arc plate shape and is welded to the second pad 32, and a second extension 35 extending from the second attachment base 34 to the body portion 5 side in parallel with the cylinder portion 8. And a second contact part 36 extending from the tip of the second extension part 35 toward the inner peripheral surface 27 of the body part 5. The second abutting portion 36 abuts on the inner peripheral surface 27 of the trunk portion 5 when the displacement of the trunk portion 5 in the axial direction of the reactor containment vessel 1 (hereinafter referred to as a longitudinal displacement) exceeds a predetermined amount. It is separated from the body part 5. The predetermined amount of longitudinal displacement is the interval between the first abutment portion 21 and the cylinder portion 8 so that the second abutment portion 36 and the barrel portion 5 also abut simultaneously when the first abutment portion 21 and the cylinder portion 8 abut. Set to about half. Further, the second extension portion 35 and the second contact portion 36 are formed in an arc shape along the inner peripheral surface 27 of the body portion 5, and the body portion 5 is deformed to contact the second contact portion 36. Sometimes the inner peripheral surface 27 of the body 5 is received by the surface.

  Next, the operation of this embodiment will be described.

  When the internal pressure of the reactor containment vessel 1 increases, the trunk portion 5 of the large-diameter hatch 37 is deformed in accordance with the deformation of the reactor containment vessel 1 and expands in the circumferential direction of the reactor containment vessel 1 and shrinks in the axial direction. To do. When the lateral displacement of the trunk portion 5 is less than the predetermined amount, the first extension member 16 and the second extension member 31 do not interfere with the deformation of the trunk portion 5 and the trunk portion according to the deformation of the reactor containment vessel 1. 5 is freely deformed. Further, when the lateral displacement of the body portion 5 exceeds a predetermined amount, the first extending member 16 comes into contact with the inner peripheral surface 22 of the cylindrical portion 8 and the inner peripheral surface 27 of the body portion 5 is brought into contact with the deformation of the body portion 5. Abuts on the second extension member 31. Thereby, the displacement of the body 5 is transmitted to the end plate 6 and the rigidity of the end plate 6 is transmitted to the body 5, and the displacement of the body 5 is suppressed.

  As described above, the restriction member 30 extends from the inner peripheral side of the barrel 5 to the inner peripheral side of the end plate 6, and the second extending member 16 extends from the inner peripheral side of the end plate 6 to the inner peripheral side of the barrel 5. The first extension member 16 is provided at two locations on the inner peripheral surface 27 of the trunk portion that is spaced apart in the circumferential direction of the reactor containment vessel 1 and spaced in the diameter direction of the trunk portion 5. The member 31 is provided at two locations on the inner peripheral surface 22 that are separated from each other in the diameter direction of the end plate 6, and the end plate 6 is formed so that the second extending members 31 are arranged along the axial direction of the reactor containment vessel 1. Therefore, the deformation of the body portion 5 can be more strongly suppressed with a simple structure without impairing the function of loading the cargo.

  The second extension member 31 facing the inner peripheral surface 27 of the trunk portion 5, that is, the second extension portion 35 and the second abutting portion 36 of the second extension member 31 are formed in an arc shape along the inner peripheral surface 27 of the trunk portion 5. Since the body 5 is formed so as to be received by the surface, it is possible to more effectively prevent the local concentration of the force on the body 5 and to correct the deformation of the body 5. The trunk portion 5 can be supported, and deformation of the trunk portion 5 can be suppressed.

  Since the second extension member 31 is arranged to be separated from the trunk portion 5 so that the second extension member 31 contacts the trunk portion 5 when the radial displacement of the trunk portion 5 exceeds a predetermined amount, The rigidity of the caliber hatch 37 can be prevented from being higher than the other portions of the reactor containment vessel 1 and affect the seismic strength and the like, and can be easily retrofitted to the existing reactor containment vessel 1 as well. Can do.

  The restricting member 30 may be composed only of the second extending member 31.

  Further, as shown in FIG. 10, the regulating member 40 may be formed by forming a fitting portion 41 which is uneven in the radial direction on the body portion 5 and the cylindrical portion 8 and is fitted to each other.

DESCRIPTION OF SYMBOLS 1 Reactor containment vessel 3 Large diameter hatch 4 Opening 5 Trunk part 6 End plate 8 Tube part 9 Lid part 15 Restriction member 16 First extension member 30 Restriction member 31 Second extension member

Claims (7)

An opening is formed in the outer periphery of the nuclear reactor containment vessel formed in a cylindrical vessel shape, and a cylindrical trunk extending radially inward of the nuclear reactor containment vessel is provided at the periphery of the opening, and at the tip of the trunk, A large-diameter hatch that has a cylindrical portion having the same diameter as that of the body portion and has a lid portion that closes the opening of the cylindrical portion so that the cylindrical portion is abutted against the body portion. A large-diameter hatch that is provided with a restricting member that engages with the other when the internal pressure of the reactor containment vessel rises and the body is deformed to restrict deformation of the body. . The restricting member includes a first extension member extending from the inner peripheral side of the trunk portion to the inner peripheral side of the end plate, and the first extension member is spaced apart in the circumferential direction of the reactor containment vessel and 2. The large-diameter hatch according to claim 1, wherein the large-diameter hatch is provided at two locations on the inner peripheral surface of the body portion that are separated in the diameter direction. The first extending member facing the inner peripheral surface of the end plate is formed in an arc shape along the inner peripheral surface of the end plate, and the displacement of the body portion is transmitted to the inner peripheral surface of the end plate by a surface. Large-diameter hatch described. The restricting member includes the first extending member and a second extending member extending from the inner peripheral side of the end plate to the inner peripheral side of the body portion, and the second extending member is separated in the diameter direction of the end plate. 4. The large plate according to claim 2, wherein the end plate is attached to the barrel so that the second extending members are arranged in two locations along the axial direction of the reactor containment vessel. Caliber hatch . The large-diameter hatch according to claim 4, wherein the second extending member facing the inner peripheral surface of the trunk portion is formed in an arc shape along the inner peripheral surface of the trunk portion and receives the displacement of the trunk portion by the surface. . The first extension member is disposed apart from the end plate so that the first extension member contacts the end plate when the radial displacement of the body part exceeds a predetermined amount. Large-diameter hatch described in crab. The said 2nd extension member is arrange | positioned spaced apart from the said trunk | drum so that the said 2nd extension member may contact | abut to the said trunk | drum when the displacement of the radial direction of the said trunk | drum exceeds predetermined amount. Large-diameter hatch described.

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