JP2014085242A - Electric wiring penetration part structure of reactor containment vessel and reactor containment vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric wiring penetration part structure of a reactor containment vessel capable of: securing sealability of electric wiring penetration parts during a station blackout accident; and transmitting information necessary for monitoring during the station blackout accident to the outside of the reactor containment vessel.SOLUTION: An electric wiring penetration part structure 14 provided by penetrating a reactor containment vessel comprises a sleeve 15 penetrating a shell 4 and a plurality of electric wiring penetration parts penetrating a header 22 provided at the end of the sleeve 15. These electric wiring penetration parts include one electric wiring penetration part 17 and six electric wiring penetration parts 21. The electric wiring penetration part 17 internally places a glass insulation sealer through which a plurality of cables 20 having stainless-steel covering materials penetrate. A cooler 23 is provided facing the outer surface of each of the electric wiring penetration parts 21 outside the reactor containment vessel. The electric wiring penetration parts 21 are cooled by the cooler 23 during a station blackout accident.

Description

  TECHNICAL FIELD The present invention relates to an electric wiring penetration part structure of a nuclear reactor containment vessel and a nuclear reactor containment vessel, and more particularly to an electric wiring penetration part structure of a nuclear reactor containment vessel suitable for application to a boiling water nuclear power plant. Concerning the container.

  In a nuclear power plant using light water as a coolant for cooling a fuel assembly loaded in a reactor core in a reactor pressure vessel, a reactor containment vessel surrounding the reactor pressure vessel is provided. The reactor containment vessel prevents the released radioactive material from leaking to the outside environment even if a serious accident occurs and the radioactive material in the core is released from the reactor pressure vessel.

  The reactor vessel of the improved boiling water reactor (ABWR) is made of reinforced concrete and has a steel liner on the inside to maintain hermeticity. The reactor containment vessel has a cylindrical shell portion installed on a concrete mat and a top slab portion provided at the upper end of the shell portion, and a dry well head is detachably attached to the top slab portion. Yes. Such a reactor containment vessel is installed in the reactor building.

  A reactor pressure vessel containing a reactor core is disposed in a reactor containment vessel, and is installed on a cylindrical pedestal provided in the reactor containment vessel. A dry well and a pressure suppression chamber, which are separated from each other, are formed in the reactor containment vessel by the diaphragm floor and the pedestal installed in the reactor containment vessel.

  A number of wires connected to each sensor installed in the reactor pressure vessel and each sensor installed in the reactor containment vessel, and power supply connected to the pump and motor installed in the reactor containment vessel Cable, and wiring that is connected to a motor-operated valve provided in the piping to transmit a control signal are taken out of the reactor containment through a plurality of electrical wiring penetrations that penetrate the reactor containment. Yes. In order to prevent the leakage of gas in the reactor containment vessel, airtight measures are taken at the electrical wiring penetration.

  Japanese Patent No. 2813360 and Japanese Patent Application Laid-Open No. 7-104089 propose a structure for reducing leakage of the electrical wiring penetration. In the electrical wiring penetrating structure described in Japanese Patent No. 2813360, the end of the electrical wiring penetrating part is covered with a pressurizing chamber outside the reactor containment vessel, and pressurized gas is supplied to the pressurizing chamber from the pressurizing device. The pressure in the pressurizing chamber is supplied to be higher than the pressure in the reactor containment vessel. As a result, it is possible to prevent the gas in the reactor containment vessel from leaking to the outside through the electrical wiring penetration.

  The electric wiring penetrating portion penetrating the reactor containment vessel described in Japanese Patent Laid-Open No. 7-104089 is fixed by filling the electric wiring laid in the sleeve of the electric wiring penetrating portion with a synthetic resin. A hollow portion is formed in a sleeve filled with synthetic resin, and a high-pressure gas having a pressure higher than that of the reactor containment vessel is supplied into the hollow portion. Even if a gas leakage path is formed in the synthetic resin due to deterioration, the pressure in the cavity is high, so that the gas in the reactor containment vessel can be prevented from leaking to the outside.

  Japanese Utility Model Laid-Open No. 1-134299 describes that a radiation detector is disposed in a penetrating portion that penetrates a containment vessel and protrudes into the containment vessel, and measures a dose in the containment vessel. Yes. This penetration part does not communicate with the region in the reactor containment vessel. When a coolant loss accident occurs, in order to prevent the temperature of the cable connected to the radiation detector from rising and generating noise, a cooling device is attached to the penetration portion to cool the cable.

  In the electrical wiring penetration part of the reactor containment vessel described in JP-A-63-25812, cooling air is supplied into the conduit of the electrical wiring penetration part to cool the cable in the conduit.

Japanese Patent No. 2813360 Japanese Patent Laid-Open No. 7-104089 Japanese Utility Model Publication No. 1-134299 JP-A 63-25812

  In the nuclear power plant, it is assumed that an accident of loss of all AC power has occurred, and the high-temperature and high-pressure cooling water in the reactor pressure vessel has become steam and has flowed into the reactor containment vessel. In this case, the temperature of the reactor containment vessel rises due to the high-temperature steam that has flowed into the reactor containment vessel, and the temperature of the electrical wiring penetration portion also rises. In the electrical wiring penetration part filled with the synthetic resin (for example, epoxy resin), the synthetic resin deteriorates due to the temperature rise at the time of the loss of all AC power supply, and the hermeticity and insulation in the electrical wiring penetration part are lowered.

  In order to prevent the deterioration of the airtightness and insulation of the electrical wiring penetration filled with synthetic resin in the event of loss of all AC power, all the electrical wiring penetration filled with synthetic resin is used as an insulating sealant for heat. It is conceivable to use a strong inorganic material (such as glass and ceramics) in the electrical wiring penetration. Since the inorganic material that is an insulating seal material does not deteriorate even in the event of a loss of all AC power, an electrical wiring penetrating part that uses such an inorganic material as an insulating seal material is airtight and insulated in the event of a loss of all AC power. Sex does not decrease. However, it takes a very long time to replace all of the many electrical wiring penetrations provided in the reactor containment vessel filled with synthetic resin with electrical wiring penetrations using an insulating insulating material made of inorganic material. It will take.

  In the electrical wiring penetration that penetrates the containment vessel, it is possible to prevent leakage of radioactive materials in the reactor containment by securing the sealing property of the electrical wiring penetration in the event of loss of all AC power It is necessary to secure electrical wiring that transmits information necessary for monitoring in the event of loss of all AC power to the outside of the containment vessel.

  The purpose of the present invention is to ensure the sealability of the electrical wiring penetration in the event of a loss of all AC power, and to transmit information necessary for monitoring in the event of a loss of all AC power to the outside of the reactor containment vessel An object of the present invention is to provide an electrical wiring penetration portion structure of a containment vessel and a reactor containment vessel.

A feature of the present invention that achieves the above-described object is that a cylindrical first sleeve that penetrates the reactor containment vessel, and a first sleeve attached to an end portion of the first sleeve located outside the reactor containment vessel And a plurality of electrical wiring penetrating portions penetrating the header,
The plurality of electrical wiring penetration parts include a first electrical wiring penetration part that is a part of these electrical wiring penetration parts, and a second electrical wiring penetration part that is the remaining electrical wiring penetration part,
A cylindrical second sleeve attached to the header through the first electrical wiring penetrating portion; a first insulating sealing material made of an inorganic material disposed in the second sleeve; and the first 1 having a plurality of first cables penetrating the insulating sealing material, surrounding the core wire with an insulating material of an inorganic material and covering the insulating material with a metal coating material;
A cylindrical third sleeve attached to the header through which the second electrical wiring penetrating portion is attached to the header, a second insulating sealing material made of synthetic resin and disposed in the third sleeve, and a second insulating sealing material A plurality of second cables that pass through
The cooling device is provided on the outer side of the reactor containment vessel so as to be opposed to the outer surface of each second electric wiring penetrating portion.

  Since the first insulating sealing material of the first electrical wiring penetration part is an inorganic insulating sealing material, and the first cable covers the inorganic insulating material with a metal coating material, and the core wire is disposed in the insulating material. Even in the event of a loss of all AC power, it is possible to ensure the sealing performance of the first electric wiring penetrating portion. Further, since the second electrical wiring penetrating portion is cooled by the cooling device in the event of the loss of all AC power supply, the temperature of the second insulating sealing material, which is a synthetic resin, can be reduced below the set temperature. Can be prevented. Moreover, deterioration of the covering material of the second cable can also be prevented. For this reason, the sealing performance of the second electric wiring penetrating portion can be ensured. As a result, the electrical wiring penetration structure having the first electrical wiring penetration part and the second electrical wiring penetration part can secure the sealing performance in the event of loss of all AC power supply, so that the outside of the radioactive substance in the reactor containment vessel Leakage can be prevented.

  Furthermore, information necessary for monitoring in the event of a loss of all AC power can be transmitted outside the reactor containment vessel through the plurality of first cables.

The above-described objects are: a cylindrical first sleeve that penetrates the reactor containment vessel, a header that is attached to an end portion of the first sleeve located outside the reactor containment vessel and seals the first sleeve, and A plurality of first electrical wiring penetrating portions penetrating the header,
A plurality of first electrical wiring penetrating portions penetrating the header and attached to the header, a cylindrical second sleeve, a first insulating sealing material made of an inorganic material disposed in the second sleeve, and a first This can also be achieved by having a plurality of first cables that penetrate through one insulating sealing material and surround the core wire with an inorganic insulating material and cover the insulating material with a metal coating material.

  ADVANTAGE OF THE INVENTION According to this invention, the sealing performance of an electrical wiring penetration part can be ensured at the time of all AC power supply loss accident, and the information required for monitoring at the time of all AC power supply loss accident can be transmitted out of a reactor containment vessel.

It is a block diagram of the electrical wiring penetration part structure of the nuclear reactor containment vessel of Example 1 which is one preferable Example of this invention. FIG. 2 is an enlarged vertical cross-sectional view of an electric wiring penetrating portion shown in FIG. It is the III-III arrow line view of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a boiling water nuclear power plant stored in a nuclear reactor, to which an electrical wiring penetrating part structure of Example 1 is applied. It is a block diagram of the electrical wiring penetration part structure of the reactor containment vessel of Example 2 which is another suitable Example of this invention.

  Examples of the present invention will be described below.

  An electrical wiring penetrating portion structure of a reactor containment vessel according to embodiment 1 which is a preferred embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

  The reactor containment vessel 3 of the boiling water nuclear power plant 1 to which the electrical wiring penetration structure of the present embodiment is applied will be described with reference to FIG. The boiling water nuclear plant 1 is an ABWR plant. The reactor containment vessel 3 has a cylindrical shell portion (cylindrical portion) 4 constructed on a concrete mat constituting the bottom portion, a top slab 7 formed on the upper end portion of the shell portion 4, and a dry well head 13. . The dry well head (upper lid) 13 is detachably attached to the top slab 7. As shown in FIG. 1, the shell portion 4 of the reactor containment vessel 3 includes a reinforced concrete portion 5 and a steel liner 6 lined on the inner surface of the reinforced concrete portion 5. Similarly to the shell portion 4, the top slab 7 also has a reinforced concrete portion 5 and a steel liner 6 lined on the lower surface of the reinforced concrete portion 5. The upper surface of the concrete mat constituting the bottom is also lined with a steel liner 6. The reactor containment vessel 3 is installed in the reactor building 32.

  The reactor pressure vessel 2 containing the reactor core is disposed in the reactor containment vessel 3 and installed in a cylindrical pedestal 12 provided in the reactor containment vessel 3. A diaphragm floor 11 is installed in the reactor containment vessel 3 and supported by a pedestal 12. In the nuclear reactor containment vessel 3, a dry well 8 and a pressure suppression chamber 9 which are separated from each other are formed by a diaphragm floor 11 and a pedestal 12. The reactor pressure vessel 2 is disposed in the dry well 8.

  A pressure suppression pool 10 filled with cooling water is formed in the interference pressure suppression chamber 9 surrounding the pedestal 12. One end of each of the plurality of vent passages 31 formed in the pedestal 12 communicates with the dry well 8, and the other end is opened in the cooling water of the pressure suppression pool 10.

  A plurality of electrical wiring penetration structure 14 is provided through the reactor containment vessel 3. The details of the electrical wiring penetration structure 14 will be described with reference to FIG. The electrical wiring penetration portion structure 14 includes a cylindrical sleeve 15 that penetrates the reinforced concrete portion 5 and the constituent liner 6 in the shell portion 4 of the reactor containment vessel 3, a header 22 provided at an outer end portion of the sleeve 15, and a header 22. And a plurality of electrical wiring penetrating portions provided in the header 22. For example, the electrical wiring penetration part structure 14 shown in FIG. 1 has seven electrical wiring penetration parts, as shown in FIG. These electric wiring through portions include, for example, one electric wiring through portion 17 and six electric wiring through portions 21.

  As shown in FIG. 2, the electrical wiring penetrating portion 17 has a cylindrical sleeve 18 attached to the header 22 so as to penetrate the header 22 and ensure airtightness. An insulating sealing material 19 made of glass, which is an inorganic material, is installed in the sleeve 17, and a plurality of cables 20 are provided through the insulating sealing material 19. The insulating sealing material 19 made of glass isolates the dry well 8 in the reactor containment vessel 3 from the outside of the reactor containment vessel 3, and the radioactive substance in the reactor containment vessel 3 is atomized through the electrical wiring penetration part 17. Leakage to the outside of the furnace containment vessel 3 is prevented.

  The electrical wiring penetration part 21 has a configuration in which the insulating sealing material 19 made of glass in the electrical wiring penetration part 17 is replaced with a synthetic resin which is an insulation sealing material. That is, although not shown, the electrical wiring penetration part 21 has a sleeve 18 attached to the header 22 so as to penetrate the header 22 and ensure airtightness, like the electrical wiring penetration part 17. . A plurality of cables 20 </ b> B are laid in the sleeve 18 of the electrical wiring penetrating portion 21 and penetrate through the sleeve 18. A synthetic resin (for example, epoxy resin), which is an insulating seal material, is filled in the sleeve 18 of the electrical wiring penetration portion 21 so as to fill between the cables 20B. The filled synthetic resin isolates the dry well 8 in the reactor containment vessel 3 from the outside of the reactor containment vessel 3, and the radioactive substance in the reactor containment vessel 3 is passed through the electrical wiring penetration part 21. Leakage to the outside of the containment vessel 3 is prevented.

  A cable cover 16 is installed in the sleeve 15 on the dry well 8 side of the electrical wiring through portions 17 and 21. A plurality of cables 20 passing through the electrical wiring penetrating portion 17 are separately connected to a plurality of cables 20 </ b> A laid in the reactor containment vessel 4 in the cable cover 16. These cables 20A are cables that transmit information necessary for monitoring in the event of a severe accident such as a loss of all AC power supply. For example, a sensor that measures the temperature in the reactor pressure vessel 2, a reactor pressure vessel 2 is connected to any of a sensor for measuring the pressure in the reactor containment vessel 3, a sensor for measuring the temperature in the reactor containment vessel 3, and a sensor for measuring the pressure in the reactor containment vessel 3. In the cables 20 and 20A, in order to improve heat resistance, the cable core wire disposed in a stainless steel cladding tube (coating material) is surrounded by an inorganic material aluminum oxide (or magnesium oxide) as an insulating material in the cladding tube. It has a configuration. A plurality of cables 20 </ b> B passing through each electrical wiring penetration 21 are separately connected to a plurality of cables 20 </ b> C laid in the reactor containment vessel 4 within the cable cover 16. These cables 20C include sensors provided for the reactor pressure vessel 2, sensors provided for the reactor containment vessel 3, motors other than the above-described sensors for measuring pressure and sensors for measuring temperature. Separately connected to the pump. The cables 20B and 20C are covered with, for example, a flame-retardant crosslinked polyethylene, and a synthetic resin is used as an insulating material. The cables 20 and 20B connected to each sensor are connected to a display device of an operation panel (not shown) installed in a central control room (not shown) of the boiling water nuclear power plant 1. The cable 20B connected to the motor and the pump is connected to a power source.

  The cooling device 23 is disposed on the outer side of the reactor containment vessel 3, that is, on the outer side of the header 22 so as to face the outer surface of each electric wiring penetration portion 21. The pipes 25 connected to the respective cooling devices 23 are connected to the bottom of the tank 24 filled with cooling water. An on-off valve 27 is provided in the pipe 27. The tank 24 is disposed above each electrical wiring penetration 21.

  A thermometer 28 is installed on the outer surface of the sleeve 18 of one electrical wiring penetration 21 in the sleeve 15 on the dry well 8 side of the header 22. A cable 29 is connected to these thermometers 28. The cable 29 has the same configuration as that of the cable 20A, and surrounds the core wire with an inorganic insulating material, and surrounds the core wire surrounded with the insulating material with a barbarian covering material. The cable 29 reaches the dry well 8 through the cable cover 16, and passes through the electric wiring through portion 21 of the other electric wiring through portion structure 14 provided in the reactor containment vessel 3. 14 cable covers 16 are reached. The wiring 29 passes through the electrical wiring penetration portion 21 provided in the other electrical wiring penetration portion structure 14 in the cable cover 16 of the other electrical wiring penetration portion structure 14, and goes out of the reactor containment vessel 3. Connected to an extended cable.

  Since the number of sensors that measure information necessary for monitoring in the event of a loss of all AC power supply is small, the number of cables 20 is very small compared to the number of cables 20B. For this reason, the number of electrical wiring penetrating parts 17 provided in the boiling water nuclear power plant 1 is very small compared to the electrical wiring penetrating part 21. For this reason, there is a case in which all of the plurality of electrical wiring penetrations provided in the electrical wiring penetration structure 14 are electrical wiring penetrations 21. As described above, the cooling device 23 is provided outside the reactor containment vessel 3 for each of all the electrical wiring penetration portions 21 provided in all the electrical wiring penetration portion structures 14. When the thermometers 28 are installed on the outer surfaces of all the electrical wiring penetrations 21 in each sleeve 15, the wiring 29 connected to the thermometer 28 is the number of electrical wiring penetrations 21 in the entire reactor containment vessel 3. An equal number is required, and it takes time to lay the wiring 29. For this reason, a thermometer 28 is provided on the outer surface of a typical electrical wiring penetration 21, for example, the electrical wiring penetration 21 having the highest temperature in the electrical wiring penetration structure 14, for one electrical wiring penetration structure 14. And a wiring 29 is connected to the thermometer 28. As a result, the number of wires 29 is reduced, and the time required for laying the wires 29 in the reactor containment vessel 3 is reduced.

  In the boiling water atomic weight plant 1 in operation, it is assumed that an accident of losing all AC power has occurred. The cooling function of the core in the reactor pressure vessel 2 is lost, and the high-pressure and high-temperature cooling water in the reactor pressure vessel 2 becomes high-temperature steam and is jetted into the dry well 8. The vapor in the dry well 8 is discharged into the cooling water of the pressure suppression pool 10 through each vent passage 31 and condensed. For this reason, the rise in the pressure in the reactor pressure vessel 3 is suppressed. However, since the high-temperature vapor is released into the dry well 8, the temperature of the electric wiring through portions 17 and 21 of the electric wiring through portion structure 14 increases.

  The temperature measured by the thermometer 28 has risen to a set temperature that is set lower than the deterioration temperature of the synthetic resin (for example, epoxy resin) that is an insulating sealing material filled in the sleeve 17 of the electrical wiring penetration 21. At that time, a control device (not shown) for inputting the measured temperature opens the on-off valve 27. The deterioration temperature of the flame retardant crosslinked polyethylene is equivalent to the deterioration temperature of the epoxy resin. The control device is supplied with electric power from a battery, and the electric power of the battery is also used for opening the on-off valve 27. When the on-off valve 27 is opened, the cooling water in the tank 24 is supplied to the cooling device 23 through the pipe 25 by gravity, and is sprayed from the nozzle of the cooling device 23 toward the outer surface of the electric wiring penetration 21 near the header 22. . The temperature of the electrical wiring through portion 21 is lowered by the cooling water sprayed from the nozzle of the cooling device 23, and the temperature of the insulating sealing material 19 and the covering material of the cable 20B existing in the electrical wiring through portion 21 is lower than the set temperature. To do. In each electric wiring penetration part 21, the synthetic resin which is an insulation sealing material, and the coating | covering material of the cable 20B have deteriorated at least in the area | region cooled below to preset temperature with the cooling water sprayed from the nozzle of the cooling device 23. FIG. Not kept in a healthy state. In the electrical wiring penetrating portion 21, the synthetic resin as the insulating seal material and the covering material of the cable 20B are not deteriorated even in the portion outside the region. For this reason, even if the accident of losing all AC power occurs and the temperature of the reactor containment vessel 3 rises, at least each of the synthetic resin, which is an insulating seal material in the electrical wiring penetration portion 21, and the covering material of the cable 20B Since a part is held in a healthy state, it is possible to prevent the radioactive substance in the reactor containment vessel 3 from leaking to the outside through the electric through-holes 21. At the time of all AC power loss accident, in the dry well 8, the covering material and the insulating material of the cable 20C deteriorate due to contact with the high-temperature steam in the dry well 8, and the insulation of the core wire of the cable 20C is impaired. For this reason, it becomes impossible to transmit the measurement signal through the core wire of the cable 20C.

  The cable 20 penetrating the inside of the electric wiring penetrating portion 17 is made of stainless steel, which is an inorganic material, and uses aluminum oxide, which is an inorganic material, as an insulating material. Even if the temperature of 17 rises above the set temperature, the covering material and the insulating material of the cable 20 do not deteriorate. For this reason, the soundness of the cables 20 and 20A can be maintained at the time of the all AC power loss accident, and information that needs to be monitored at the time of the total AC power loss accident (for example, measured in the reactor pressure vessel 2). Temperature and pressure, and measured temperature and pressure in the reactor containment vessel 3) can be reliably transmitted to the display device provided in the central control room through the cables 20 and 20A. Therefore, the operator can grasp the respective temperatures and pressures in the reactor pressure vessel 2 and the reactor containment vessel 3 at the time of the loss of all AC power supply by viewing the information displayed on the display device. The state in the reactor pressure vessel 2 and the reactor containment vessel 3 can be known.

  In this embodiment, in the event of a loss of all AC power supply, outside the reactor containment vessel 3, the cooling water 26 is filled from the nozzle of the cooling device 23, and the synthetic resin, which is the insulating seal material, of the electrical wiring penetration portion 21 is filled. Since it injects on the outer surface of the part which is, the quantity of the cooling water 26 injected from a nozzle can be reduced. Further, since the temperature of the injected cooling water 26 is equal to or higher than the saturation temperature corresponding to the pressure in the dry well 8 from which the vapor has been discharged and is equal to or lower than the set temperature, the cooling water 26 is cooled. The sealing property of the electrical wiring through part 21 can be maintained, and the amount of the cooling water 26 used for cooling the electrical wiring through part 21 can be reduced. In addition, the fact that the amount of the cooling water 26 used for cooling the electrical wiring through portion 21 can be reduced can reduce the size of the nozzle that injects the cooling water 26.

  In this embodiment, since the insulating sealing material 19 of the electrical wiring penetrating portion 17 is glass made of an inorganic material, the temperature of the electrical wiring penetrating portion 17 rises to a set temperature or higher even in the event of loss of all AC power. In addition, the sealing property of the electric wiring penetrating portion 17 can be ensured. Since the covering material and insulating material of the cable 20 passing through the electric wiring penetrating portion 17 are inorganic materials, the covering material and insulating material of the cable 20 are not deteriorated, and this also ensures the sealing performance of the electric wiring penetrating portion 17. can do. Further, in the portion where the cooling device 23 does not sufficiently cool the synthetic resin and the cable 20B, which are insulating sealing materials present on the dry well 8 side of the header 22 in the electrical wiring penetration portion 21, the synthetic resin, and The covering material and the insulating material of the cable 20B are deteriorated, and the sealing performance cannot be secured. However, the function of the synthetic resin, which is an insulating seal material, and the covering material and the insulating material of the cable 20B, can be maintained in the portion of the electric wiring penetrating portion 21 that is lower than the set temperature by cooling by the cooling device 23. . For this reason, it is possible to prevent the radioactive material in the reactor containment vessel 3 from leaking to the outside of the reactor containment vessel 3 through the electrical wiring penetrations 17 and 21 in the event of the loss of all AC power.

  In the present embodiment, it is not necessary to perform the work of replacing all the electrical wiring penetration portions 21 provided in the electrical wiring penetration portion structure provided through the reactor containment vessel 3 with the electrical wiring penetration portion 17. Since a part of the penetration part 21 is replaced with the electrical wiring penetration part 17 having high heat resistance, even if the cooling device 23 is installed in each electrical wiring penetration part 21, the time required for the replacement can be shortened.

  An electrical wiring penetrating portion structure of a reactor containment vessel according to embodiment 2, which is another preferred embodiment of the present invention, will be described with reference to FIG. The electric wiring penetration part structure of a present Example is applied to the nuclear reactor containment vessel of an ABWR plant.

  The electrical wiring penetration structure 14A of the present embodiment is a cylindrical sleeve 15A that penetrates the reinforced concrete part 5 and the constituent liner 6 in the shell part 4 of the reactor containment vessel 3, and a header provided at the outer end of the sleeve 15A. 22, a plurality of electric wiring penetrating portions 17 </ b> A provided in the header 22 through the header 22. The sleeve 15 </ b> A includes a cylindrical small-diameter sleeve portion 30 in which the cable cover 16 is disposed, and a large-diameter sleeve portion 31 that is connected to the small-diameter sleeve portion 30 and disposed outside the reactor containment vessel 3. . One end portion of the large diameter sleeve portion 31 is connected to the end portion of the small diameter sleeve portion 30 outside the reactor containment vessel 3, and the outer diameter of the large diameter sleeve portion 31 increases from this end portion of the small diameter sleeve portion 30. ing. The outer diameter D1 of the small diameter sleeve portion 30 is smaller than the maximum outer diameter D2 of the large diameter sleeve portion 31. A small-diameter sleeve portion 30 is installed in the shell portion 4 through the shell portion 4 of the reactor containment vessel 3.

  The header 22 is attached to the other end portion of the large diameter sleeve portion 31. A plurality of, for example, seven electrical wiring penetrating portions 17 </ b> A penetrate through the header 22 and are attached to the header 22. Each electric wiring penetrating portion 17A has substantially the same configuration as the electric wiring penetrating portion 17 used in the first embodiment. However, the electrical wiring penetrating portion 17A is different from the electrical wiring penetrating portion 17 in the number of cables 20 passing through the inside. The number of cables 20 passing through the interior is greater in the electrical wiring penetration 17A than in the electrical wiring penetration 17.

  In the first embodiment, since the outer diameter of the sleeve 18 of the electric wiring penetrating portion 17 is the same as the outer diameter of the sleeve 18 of the electric wiring penetrating portion 21, the number of cables 20 passing through the inside of the electric wiring penetrating portion 17 is the same. The number is less than the number of cables 20 </ b> B that pass through the interior of the electrical wiring penetration 21. This is because the insulating insulating material 19 made of glass, which is an inorganic material, is used in the electrical wiring penetrating portion 17. When the insulating sealing material 19 which is an inorganic material is used, it is necessary to previously form a through hole through which the cable 20 passes through the insulating sealing material 19. For this reason, the interval between the through holes may be too narrow. Therefore, the number of cables 20 that pass through the inside of the electrical wiring through portion 17 is smaller than the number of cables 20B that pass through the inside of the electrical wiring through portion 21. When the number of cables 20 is greater than the number of cables 20 that pass through one electrical wiring penetration part 17, the electrical wiring penetration part of the spare electrical wiring penetration part structure provided in the reactor containment vessel 3 is passed. .

  In the electrical wiring penetration portion structure 14A of the present embodiment, the same number of cables 20 as the cables 20B passing through the electrical wiring penetration portion 21 provided in the first embodiment pass through each electrical wiring penetration portion 17A. The outer diameter of each of the electric wiring penetrating portions 17 is larger than the outer diameter of each electric wiring penetrating portion 17A. As a result, the outer diameter D2 of the large diameter sleeve portion 31 is larger than the outer diameter D1 of the small diameter sleeve portion 30. Incidentally, the outer diameter D1 of the small diameter sleeve portion 30 is the same as the outer diameter of the sleeve 15 used in the first embodiment.

  All the cables 20 passing through all the electric wiring through portions 17A provided in the electric wiring through portion structure 14A are separately connected to the cables 20A laid in the reactor containment vessel 3 within the cable cover 16. . In the present embodiment, the cable 20A is not only a sensor that measures information necessary for monitoring in the event of a loss of all AC power supply, but also other sensors, motors, and sensors disposed in the reactor containment vessel 3 other than these sensors. Separately connected to the pump.

  All of the electrical wiring penetration structure provided in the reactor containment vessel 3 is an electrical wiring penetration structure 14A. In the present embodiment, not only information necessary for monitoring in the event of a loss of all AC power but also other measured information is transmitted through the cable 20A and the cable 20 passing through the electrical wiring penetrating portion 17A.

  In the present embodiment, the cable 20 penetrating through the electric wiring penetrating portion 17A is made of an inorganic material stainless steel and uses an inorganic material aluminum oxide as an insulating material. In this case, even if the temperature of the electrical wiring penetrating portion 17 rises to a set temperature or higher, the covering material and the insulating material of the cable 20 are not deteriorated, and further, the glass that is the insulating sealing material 19 of the electric wiring penetrating portion 17A is not deteriorated. For this reason, even in the event of loss of all AC power supply, the sealing property of the electrical wiring penetration part 17 can be secured, and the radioactive material in the reactor containment vessel 3 is prevented from leaking outside through the electrical wiring penetration part 17A. it can. In addition, since the soundness of the cables 20 and 20A can be maintained, information that needs to be monitored in the event of a loss of all AC power (for example, the measured temperature and pressure in the reactor pressure vessel 2, and the reactor containment vessel 3). The measured temperature and pressure can be reliably transmitted to the display device provided in the central control room through the cables 20 and 20A.

  In the reactor containment vessel 3 in which the electrical wiring penetration portion structure 14A of the present embodiment is installed, a part of the plurality of electrical wiring penetration portion structures provided in the reactor containment vessel 3 is used as the electrical wiring penetration portion structure 14A, and the remaining The electrical wiring penetration part structure is an electrical wiring penetration part structure in which all, for example, seven electrical wiring penetration parts installed in the electrical wiring penetration part structure are all electrical wiring penetration parts 21. The number of the former electric wiring penetration structure 14A is smaller than the number of the latter electric wiring penetration structure. In the latter electrical wiring penetrating structure provided in the reactor containment vessel 3, the cooling device 23 is attached to all the electrical wiring penetrating portions 21 outside the reactor containment vessel 3 as in the first embodiment. In the event of a loss of all AC power, the cooling water 26 is sprayed separately from the nozzles of the cooling device 23 toward the outer surfaces of all the electrical wiring penetrations 21 to cool each electrical wiring penetration 21.

  In this way, a part of the plurality of electrical wiring penetration structures is the electrical wiring penetration structure 14A, and the remaining electrical wiring penetration structure is an electrical wiring penetration in which all electrical wiring penetrations are electrical wiring penetrations 21. Each effect produced in the first embodiment can also be obtained by using the partial structure.

  In the present embodiment, the plurality of electric wiring through portions 17A are arranged in the large diameter sleeve portion 31 having an outer diameter larger than that of the plurality of small diameter sleeve portions 30. 1 can be made larger than the outer diameter of the electrical wiring penetration part 17, and the number of cables 20 passing through the electrical wiring penetration part 17 </ b> A can be made larger than the number of cables 20 passing through the electrical wiring penetration part 17. it can. For this reason, in the present embodiment, the number of electrical wiring penetrating portions 17A provided in the reactor containment vessel 3 through which the cable 20 is passed is set as the number of electric wires passing through the cable 20 provided in the reactor containment vessel 3 in the first embodiment. The number can be smaller than the number of wiring through portions 17.

  In this embodiment, since the small diameter sleeve portion 30 having a smaller outer diameter than the large diameter sleeve portion 31 penetrates the reactor containment vessel 3, compared with the case where the large diameter sleeve portion 31 penetrates the reactor containment vessel 3. Thus, the pressure resistance of the reactor containment vessel 3 can be improved.

  The electrical wiring penetration structure in each of the embodiments described above is not only the reactor containment vessel 3 of the ABWR plant, but also the reactor containment vessel of the BWR-5 type boiling water nuclear plant and the reactor containment of the pressurized water nuclear plant. It can also be applied to containers.

  DESCRIPTION OF SYMBOLS 1 ... Boiling water type nuclear power plant, 2 ... Reactor pressure vessel, 3 ... Reactor containment vessel, 4 ... Shell part, 5 ... Reinforced concrete part, 6 ... Steel liner, 8 ... Dry well, 10 ... Pressure suppression chamber, 14 , 14A ... Electric wiring penetration part structure, 15, 18 ... Sleeve, 17, 17A, 21 ... Electric wiring penetration part, 19 ... Insulating seal member, 20, 20A, 20B, 20C ... Cable, 22 ... Header, 23 ... Cooling device , 24 ... tank, 25 ... piping, 28 ... thermometer, 29 ... wiring, 30 ... small diameter sleeve portion, 31 ... large diameter sleeve portion.

Claims (6)

A cylindrical first sleeve penetrating the reactor containment vessel, a header attached to an end of the first sleeve located outside the reactor containment vessel and sealing the first sleeve, and the header A plurality of electrical wiring penetrating parts penetrating through,
The plurality of electrical wiring penetration parts include a first electrical wiring penetration part that is a part of these electrical wiring penetration parts, and a second electrical wiring penetration part that is the remaining electrical wiring penetration part,
A cylindrical second sleeve attached to the header through the first electrical wiring penetrating portion, the first insulating sealing material made of an inorganic material disposed in the second sleeve, and A plurality of first cables penetrating the first insulating sealing material, surrounding the core wire with an inorganic insulating material and covering the insulating material with a metal coating;
The second electrical wiring penetrating portion penetrates the header and has a cylindrical third sleeve attached to the header, a second insulating seal material made of synthetic resin disposed in the third sleeve, and the first 2 having a plurality of second cables penetrating the insulating sealing material;
An electrical wiring penetrating portion structure for a nuclear reactor containment vessel, wherein a cooling device is provided on the outside of the reactor containment vessel so as to face the outer surface of each of the second electric wiring penetrating portions.   A thermometer is attached to the surface of the second electrical wiring penetration part in the second sleeve, and the cooling device has a nozzle for injecting cooling water toward the surface of the second electrical wiring penetration part, and the cooling A tank filled with water is arranged at a position above the second electric wiring penetrating portion, communicated with the nozzle by a pipe line, and inputs a temperature measured by the thermometer, and this temperature is equal to or higher than a set temperature. The electrical wiring penetration part structure of the nuclear reactor containment vessel of Claim 1 which provides the control apparatus which opens the on-off valve provided in the said pipe line when it becomes. A cylindrical first sleeve penetrating the reactor containment vessel, a header attached to an end of the first sleeve located outside the reactor containment vessel and sealing the first sleeve, and the header A plurality of first electrical wiring penetrating portions penetrating through
A plurality of first electrical wiring penetration portions that pass through the header and are attached to the header of a cylindrical second sleeve, and a first insulating sealing material made of an inorganic material disposed in the second sleeve A plurality of first cables penetrating the first insulating sealing material, surrounding the core wire with an insulating material of an inorganic material, and covering the insulating material with a metal coating material;
The first sleeve includes a small-diameter portion and a large-diameter portion having an outer diameter larger than that of the small-diameter portion;
The small diameter portion penetrates the reactor containment vessel;
The electrical wiring penetrating portion structure of a nuclear reactor containment vessel, wherein the plurality of first electric wiring penetrating portions are disposed in the large diameter portion. A cylindrical portion, an upper lid that is detachably attached to the upper end portion of the cylindrical portion, and a plurality of electrical wiring penetrating portion structures that penetrate the cylindrical portion and are provided in the cylindrical portion,
A part of the plurality of electrical wiring penetration structures is a first electrical wiring penetration structure that is the electrical wiring penetration structure according to claim 1 or 2, and the remainder of the plurality of electrical wiring penetration structures is A nuclear reactor containment vessel having a second electric wiring penetration portion structure having a plurality of the second electric wiring penetration portions. A cylindrical portion, an upper lid that is detachably attached to the upper end portion of the cylindrical portion, and a plurality of electrical wiring penetrating portion structures that penetrate the cylindrical portion and are provided in the cylindrical portion,
The reactor containment vessel according to claim 3, wherein the plurality of electrical wiring penetration structure is the electrical wiring penetration structure according to claim 3. A cylindrical portion, an upper lid that is detachably attached to the upper end portion of the cylindrical portion, and a plurality of electrical wiring penetrating portion structures that penetrate the cylindrical portion and are provided in the cylindrical portion,
A part of the plurality of electrical wiring penetration structures is a first electrical wiring penetration structure that is the electrical wiring penetration structure according to claim 3,
The remainder of the plurality of electrical wiring penetration structures is attached to a cylindrical third sleeve that penetrates the cylindrical part, and an end of the third sleeve that is located outside the reactor containment vessel. A third header that seals the three sleeves, and a plurality of second electrical wiring penetrating portions that penetrate the other header,
The second electrical wiring penetrating portion penetrates the header and is attached to the header of a cylindrical fourth sleeve, a second insulating seal material made of synthetic resin disposed in the fourth sleeve, and the first 2. A containment vessel comprising a plurality of second cables penetrating through an insulating sealing material.

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