JP2014235016A - Reactor containment vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leak of gas from a reactor containment vessel even in a severe accident, in the reactor containment vessel in which the penetration unit is sealed by a seal section such as a gasket.SOLUTION: The reactor containment vessel includes a main body surrounding a reactor pressure vessel, and a penetration unit that goes in and out of the main body. The penetration unit includes: a middle part penetrating the main body; a lid for opening or closing the middle part; and a seal section interposed between the middle part and the lid when the lid is closed. The reactor containment vessel includes a shield member that is disposed on the middle part of the penetration unit and closer to the inside of the main body than the seal section.

Description

  The present invention relates to a nuclear reactor containment vessel.

  For example, a reactor containment vessel as shown in Patent Document 1 is provided with a through portion for entering and exiting the reactor containment vessel during construction or maintenance of a nuclear power plant. For example, the above-mentioned through-holes are a hatch for taking equipment into and out of the reactor containment vessel, an air lock for workers to enter and leave the reactor containment vessel, and the like.

  Such a penetrating portion generally includes a trunk portion that penetrates the main body of the reactor containment vessel and a door for opening and closing the trunk portion. Further, a gasket is interposed between the trunk portion and the closed door so that the radioactive substance inside the reactor containment vessel does not leak to the outside of the reactor containment vessel.

JP-A-53-131387

  In the future, as a countermeasure against severe accidents at nuclear power plants, it is highly likely that it is required to improve the reliability of the containment of the reactor containment vessel. For example, even if the inside of the reactor containment vessel becomes extremely hot due to a severe accident, it is desirable that the radioactive material inside the reactor containment vessel does not leak as much as possible from the penetration portion. However, in the conventional structure, when the inside of the reactor containment vessel becomes high temperature, the possibility that the gasket deteriorates and a large amount of radioactive material leaks cannot be denied.

  The present invention has been made in view of the above-mentioned problems. In a reactor containment vessel in which a penetrating portion is sealed with a seal portion by a gasket, leakage of radioactive material inside the reactor containment vessel even during a severe accident It aims at reducing.

  The present invention adopts the following configuration as means for solving the above-described problems.

  1st invention is equipped with the main-body part which encloses a reactor pressure vessel, and the penetration part for getting in and out with respect to the said main-body part, The said penetration part penetrated the said main-body part, The said trunk | drum A reactor containment vessel having a door that opens and closes and a seal portion interposed between the trunk portion and the door when the door is closed, and is installed in the trunk portion of the penetration portion A configuration is adopted in which a shielding member is provided closer to the inside of the main body than the seal.

  According to a second invention, in the first invention, the shielding member includes a cover portion that covers an opening inside the main body portion of the body portion, and the cover portion includes a heat insulating layer made of a heat insulating material and a steel material. A configuration having a shielding layer is employed.

  According to a third invention, in the second invention, a configuration is adopted in which the cover portion can be divided into an outer peripheral portion whose center is opened and a central portion which closes the opening of the outer peripheral portion.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the shield member is filled in a gap between the outer peripheral portion and the main body portion and includes a filling portion made of a heat insulating material.

  According to the present invention, even if the inside of the reactor containment vessel becomes high temperature due to a severe accident, the shielding member can suppress the transfer of the heat to the seal portion, and the seal portion becomes high temperature. Can be prevented. Therefore, deterioration of the seal part can be suppressed, and in the reactor containment where the penetration part is sealed by the gasket seal part, gas leakage inside the reactor containment vessel does not occur even during a severe accident. Can be.

It is sectional drawing which showed typically the schematic structure of the nuclear reactor containment vessel in one Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram containing the outward opening type hatch with which the reactor containment vessel in one Embodiment of this invention is equipped, (a) is a longitudinal cross-sectional view, (b) is AA sectional drawing of (a). is there. (A) is a schematic diagram which shows the modification of the outward opening type | mold hatch with which the reactor containment vessel in one embodiment of this invention is equipped, (b) is the outside with which the reactor containment vessel in one embodiment of this invention is equipped. It is sectional drawing containing schematic structure of an open type hatch. It is a longitudinal cross-sectional view which shows schematic structure containing the airlock with which the nuclear reactor containment vessel in one Embodiment of this invention is provided. It is a schematic block diagram containing the outward opening type hatch with which the modification of the nuclear reactor containment vessel in one Embodiment of this invention is equipped, (a) is a longitudinal cross-sectional view, (b) is a front view.

  Hereinafter, an embodiment of a reactor containment vessel according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

  FIG. 1 is a cross-sectional view schematically showing a schematic configuration of a reactor containment vessel 1 of the present embodiment. As shown in FIG. 1, the reactor containment vessel 1 includes a main body 2, a plurality of penetrations 3, and a shielding member 4.

  As shown in FIG. 1, the main body 2 is a steel vessel that surrounds the reactor pressure vessel 10. Although not shown in FIG. 1, in addition to the reactor pressure vessel 10, parts and devices such as piping and measuring equipment are accommodated in the main body 2.

  A plurality of penetrating parts 3 are installed with respect to the main body part 2 and are used to enter and exit the main body part 2 during construction and maintenance of the nuclear power plant. Parts or equipment such as pipes or workers enter and leave the main body 2 through the penetration part 3. There are various types of such penetrating portions 3, all of which have a body portion, a door, and a gasket. The reactor containment vessel 1 according to the present embodiment includes a through portion 3 (externally opening type hatch 3a, inward opening type hatch 3b, and air lock 3c are given as main structural examples). Below, these penetration part 3 and shielding member 4 are demonstrated in detail with reference to FIGS.

  FIG. 2A and FIG. 2B are schematic configuration diagrams including an outward opening type hatch 3a. 2A is a longitudinal sectional view, and FIG. 2B is an AA sectional view of FIG. The outward opening type hatch 3a is a through-hole 3 for taking in and out necessary equipment and the like in the main body 2 during construction and maintenance of the nuclear power plant. This outwardly-opening hatch 3a includes a body portion 3a1, a door 3a2, and a gasket 3a3 (seal portion).

  The body portion 3 a 1 is a cylindrical member provided through the main body portion 2, and the outer peripheral surface is welded to the main body portion 2. The above devices and the like are taken in and out through the inside of the trunk portion 3a1. The door 3a2 is for opening and closing the trunk portion 3a1, and in the outward opening type hatch 3a, the door 3a2 is installed on the opening side located outside the main body portion 2 of the trunk portion 3a1. The door 3a2 is supported by a support mechanism (not shown) and can be opened and closed with respect to the body 3a1. The gasket 3a3 is fixed to the end portion of the trunk portion 3a1 so as to be interposed between the trunk portion 3a1 and the door 3a2 when the door 3a2 closes the trunk portion 3a1. The gasket 3a3 is an annular member made of, for example, resin, and is provided over the entire circumference of the opening end of the body portion 3a1. Such an open-type hatch 3a is sealed by the gasket 3a3, and the gas in the main body 2 is prevented from leaking to the outside of the main body 2 at the normal time of the nuclear power plant.

  In the reactor containment vessel 1 of the present embodiment, as shown in FIGS. 2 (a) and 2 (b), the first shielding member is used as the shielding member 4 with respect to such an open-type hatch 3a. 4a is attached. The first shielding member 4a has a configuration in which a disc-shaped shielding layer 4a1 having a larger diameter than the body portion 3a1 and a disc-shaped heat insulating layer 4a2 having the same diameter as the shielding layer 4a1 are laminated.

  The shielding layer 4a1 is made of a steel material, and prevents high-temperature steam generated in the main body 2 due to a severe accident or the like from entering the inside of the outer opening type hatch 3a. An engaging portion 4a3 for attaching the first shielding member 4a to the trunk portion 3a1 is provided at the edge portion of the shielding layer 4a1, and the engaging portion 4a3 is engaged with the trunk portion 3a1 to form the first portion. One shielding member 4a is fixed. The heat insulating layer 4a2 is made of a heat insulating material such as glass wool, and is fixed to the shielding layer 4a1. The heat insulating layer 4a2 prevents heat from entering the outwardly opening hatch 3a when the inside of the main body 2 becomes high temperature due to a severe accident or the like.

  This 1st shielding member 4a covers opening of the main-body part 2 inside trunk | drum 3a1, and consists of a cover part of this invention. Such a 1st shielding member 4a is installed in trunk | drum 3a1, and is arrange | positioned near the inner side of the main-body part 2 rather than the gasket 3a3.

  According to the reactor containment vessel 1 having such a first shielding member 4a, even if the inside of the reactor containment vessel 1 becomes high temperature due to a severe accident, heat is generated by the first shielding member 4a by the gasket 3a3. Can be suppressed, and the gasket 3a3 can be prevented from reaching a high temperature. Therefore, deterioration of the gasket 3a3 can be suppressed, and leakage of radioactive material inside the reactor containment vessel 1 can be prevented even during a severe accident.

  Moreover, according to the reactor containment vessel 1 having the first shielding member 4a, the shielding layer 4a1 and the heat insulating layer 4a2 are laminated. For this reason, it is possible to prevent the steam and heat from entering the outward opening type hatch 3a.

  Note that the attachment of the first shielding member 4a to the outward opening hatch 3a is basically performed from the inside of the main body 2. For this reason, if the above-mentioned 1st shielding member 4a is provided with respect to all the outward opening type hatches 3a, it will become impossible to attach the 1st shielding member 4a from the inner side with respect to the last outward opening type hatch 3a. . For this reason, as shown in FIG. 3A, one of the outwardly-opening hatches 3a is attached to the outwardly-opening hatch 3a via a hinge 4a4, and the body 3a1 is attached by a handle (not shown). It is desirable to provide the first shielding member 4aA that can be opened and closed from inside.

  FIG. 3B is a cross-sectional view showing a schematic configuration of the inner opening type hatch 3b. The inward opening type hatch 3b is a through-hole 3 for taking in and out necessary equipment and the like in the main body 2 at the time of construction or maintenance of a nuclear power plant. This inward-opening type hatch 3b includes a body portion 3b1, a door 3b2, and a gasket 3b3 (seal portion).

  The body portion 3 b 1 is a cylindrical member provided through the main body portion 2, and the outer peripheral surface is welded to the main body portion 2. The above devices and the like are taken in and out through the inside of the trunk portion 3b1. The door 3b2 is for opening and closing the trunk portion 3b1, and in the inner opening type hatch 3b, the door 3b2 is installed on the opening side located inside the main body portion 2 of the trunk portion 3b1. The door 3b2 is supported by a support mechanism (not shown), and can be opened and closed with respect to the body 3b1. The gasket 3b3 is fixed to the end portion of the trunk portion 3b1 so as to be interposed between the trunk portion 3b1 and the door 3b2 when the door 3b2 closes the trunk portion 3b1. The gasket 3b3 is an annular member made of, for example, resin, and is provided over the entire circumference of the opening end of the body portion 3b1. By such a gasket 3b3, the inner opening type hatch 3b is sealed, and the gas in the main body 2 is prevented from leaking to the outside of the main body 2 at the normal time of the nuclear power plant.

  In the reactor containment vessel 1 of the present embodiment, as shown in FIG. 3B, a second shielding member 4b is attached as a shielding member 4 to such an inner opening type hatch 3b. . The 2nd shielding member 4b is formed from heat insulating materials, such as glass wool, and has covered the area | region which protruded inside the main-body part 2 of the inner opening type hatch 3b including the door 3b2. Such a second shielding member 4b prevents heat from being transferred to the gasket 3b3 when the inside of the main body 2 becomes high due to a severe accident or the like. Such a 2nd shielding member 4b is installed in the trunk | drum 3b1, and is arrange | positioned inside the main-body part 2 rather than the gasket 3b3. The second shielding member 4b may be partly detachable so as not to obstruct the opening and closing of the door 3b2.

  According to the reactor containment vessel 1 having such a second shielding member 4b, even if the inside of the reactor containment vessel 1 becomes high temperature due to a severe accident, the heat is generated by the gasket 3b3 by the second shielding member 4b. Can be suppressed, and the gasket 3b3 can be prevented from reaching a high temperature. Therefore, the deterioration of the gasket 3b3 can be suppressed, and the gas inside the reactor containment vessel 1 can be prevented from leaking even during a severe accident.

  FIG. 4 is a cross-sectional view showing a schematic configuration of the air lock 3c. The airlock 3c is a through-hole 3 for an operator to enter and exit the main body 2 during construction or maintenance of the nuclear power plant. The air lock 3c includes a body portion 3c1, a first door 3c2, a first gasket 3c3 (seal portion), a second door 3c4, and a second gasket 3c5.

  The body portion 3 c 1 is a cylindrical member provided through the main body portion 2, and the outer peripheral surface is welded to the main body portion 2. An operator enters and exits through the inside of the trunk portion 3c1. The 1st door 3c2 is for opening and closing the trunk | drum 3c1, and in the air lock 3c, it is installed in the opening side located in the outer side of the main-body part 2 of the trunk | drum 3c1. The first door 3c2 is supported by a support mechanism (not shown), and is attached to the body 3c1 so as to be opened and closed. When the first door 3c2 closes the body portion 3c1, the first gasket 3c3 is interposed between the door seat (a part of the body portion 3c1) and the first door 3c2. It is installed on the pedestal. This 1st gasket 3c3 is a member formed, for example with resin, and is provided over the perimeter of the seat of a door.

  The 2nd door 3c4 is for opening and closing the trunk | drum 3c1, and in the air lock 3c, it is installed in the opening side located inside the main-body part 2 of the trunk | drum 3c1. The second door 3c4 is supported by a support mechanism (not shown), and is attached to the body 3c1 so as to be opened and closed. When the second door 3c4 closes the body portion 3c1, the second gasket 3c5 is disposed between the door seat (a part of the body portion 3c1) and the second door 3c4. It is installed on the pedestal. This 2nd gasket 3c5 is a member formed, for example with resin, and is provided over the perimeter of the receiving seat of a door.

  The air gasket 3c is sealed by the first gasket 3c3 and the second gasket 3c5, and the gas in the main body 2 is prevented from leaking to the outside of the main body 2 at the normal time of the nuclear power plant.

  In the reactor containment vessel 1 of the present embodiment, as shown in FIG. 4, a third shielding member 4 c is attached as a shielding member 4 to such an air lock 3 c. The 3rd shielding member 4c is formed from heat insulating materials, such as glass wool, and is arrange | positioned between the 1st door 3c2 and the 2nd door 3c4. Such a 3rd shielding member 4c prevents that a heat | fever transfers to the 1st gasket 3c3, when the inside of the main-body part 2 becomes high temperature by a severe accident etc. Such a 3rd shielding member 4c is fixed to the trunk | drum 3c1, and is arrange | positioned inside the main-body part 2 rather than the 1st gasket 3c3. Note that a part of the third shielding member 4c may be detachable so as not to obstruct the opening and closing of the second door 3c4.

  According to the reactor containment vessel 1 having the third shielding member 4c as described above, even if the inside of the reactor containment vessel 1 becomes a high temperature due to a severe accident, the heat is first generated by the third shielding member 4c. Transmission to the gasket 3c3 can be suppressed, and the first gasket 3c3 can be prevented from reaching a high temperature. Therefore, it is possible to suppress the deterioration of the first gasket 3c3, and it is possible to prevent the gas inside the reactor containment vessel 1 from leaking even during a severe accident.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the spirit of the present invention.

  For example, as the shielding member 4, it is possible to use a separable fourth shielding member 4 d as shown in FIG. 5. In addition, in FIG. 5, (a) is a longitudinal cross-sectional view containing the 4th shielding member 4d, (b) is a front view. As shown in these drawings, in the fourth shielding member 4d, a disk-shaped shielding layer 4d1 having a larger diameter than the body portion 3a1 and an opening at the center thereof, and a disk-shaped and central material having the same diameter as the shielding layer 4d1 are formed. A cover portion 4d4 is provided that includes the opened heat insulating layer 4d2 and a cover portion 4d3 (center portion) that closes the central portion of the shielding layer 4d1 and the heat insulating layer 4d2.

  The shielding layer 4d1 is made of a steel material, and prevents high-temperature steam generated in the main body 2 due to a severe accident or the like from entering the inside of the outward opening type hatch 3a. The shielding layer 4d1 is divided into a plurality of portions in the circumferential direction, and is fixed to the trunk portion 3a1 by a mounting pin (not shown). The heat insulating layer 4d2 is made of a heat insulating material such as glass wool, and is fixed to the body portion 3a1 by a mounting pin (not shown). The heat insulating layer 4d2 prevents heat from entering the outwardly opening type hatch 3a when the inside of the main body 2 becomes high temperature due to a severe accident or the like. The shielding layer 4d1 and the heat insulating layer 4d2 form the outer peripheral portion of the cover portion 4d4. The lid portion 4d3 is formed of a heat insulating material and covers an opening provided in the outer peripheral portion (the shielding layer 4d1 and the heat insulating layer 4d2) of the cover portion 4d4. Such a lid portion 4d3 is fixed to the outer peripheral portion (the shielding layer 4d1 and the heat insulating layer 4d2) by a mounting pin (not shown).

  The fourth shielding member 4d is provided with a filling portion 4d5 made of a heat insulating material while being filled in a gap between the outer peripheral portion (the shielding layer 4d1 and the heat insulating layer 4d2) and the main body portion 2. The outer peripheral portion (the shielding layer 4d1 and the heat insulating layer 4d2) is fixed to the main body 2 by such a filling portion 4d5.

  If it has such a structure, since the cover part 4d4 is divided | segmented into the outer peripheral part (shielding layer 4d1 and heat insulation layer 4d2) and the center part (lid part 4d3), attachment of the 4th shielding member 4d Becomes easy. Moreover, since the cover part 4d3 can be formed lightly, it becomes possible to close from the inner side of the trunk | drum 3a1, for example, by suspending and supporting the cover part 4d3. Therefore, it is not necessary to install the hinge 4a4 as described above.

  Further, in this configuration, since the filling portion 4d5 is provided, it is possible to prevent heat from entering through the gap between the cover portion 4d4 and the main body portion 2.

  In addition, about the structure of the above-mentioned penetration part 3, it is an example and this invention is applicable to a nuclear reactor containment vessel provided with various penetration parts.

  DESCRIPTION OF SYMBOLS 1 ... Reactor containment vessel, 2 ... Main part, 3 ... Penetration part, 3a ... Opening type hatch, 3a1 ... Trunk part, 3a2 ... Door, 3a3 ... Gasket, 3b ... Inner opening Mold hatch, 3b1 ... barrel, 3b2 ... door, 3b3 ... gasket, 3c ... air lock, 3c1 ... barrel, 3c2 ... first door, 3c3 ... first gasket, 3c4 ... first 2 doors, 3c5 ... 2nd gasket, 4 ... shielding member, 4a ... 1st shielding member, 4a1 ... shielding layer, 4a2 ... heat insulation layer, 4a3 ... locking part, 4a4 ... hinge, 4aA ... ... 1st shielding member, 4b ... 2nd shielding member, 4c ... 3rd shielding member, 4d ... 4th shielding member, 4d1 ... shielding layer, 4d2 ... heat insulation layer, 4d3 ... cover part, 4d4 ... ... cover part, 4d5 ... filling part, 10 ... reactor pressure vessel

Claims (4)

A main body that surrounds the reactor pressure vessel; and a through portion for entering and exiting the main body, the through portion penetrating the main body, a door that opens and closes the main body, A reactor containment vessel having a seal portion interposed between the trunk portion and the door when the door is closed,
A reactor containment vessel comprising a shielding member that is disposed on a body portion of the penetrating portion and is disposed closer to the inside of the main body portion than the seal portion. The shielding member includes a cover portion that covers an opening inside the body portion of the trunk portion,
The reactor containment vessel according to claim 1, wherein the cover portion includes a heat insulating layer made of a heat insulating material and a shielding layer made of a steel material.   3. The reactor containment vessel according to claim 2, wherein the cover part can be divided into an outer peripheral part whose center is opened and a central part that closes the opening of the outer peripheral part.   The reactor containment vessel according to claim 3, wherein the shielding member includes a filling portion made of a heat insulating material while being filled in a gap between the outer peripheral portion and the main body portion.

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