JP2012149968A - Primary and secondary drain systems of nuclear power plant, and nuclear power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide primary and secondary drain systems of a nuclear power plant capable of securing installation space for facility instruments of a primary building, and the nuclear power plant.SOLUTION: Primary and secondary drain systems of a nuclear power plant include a primary building where a reactor coolant system including a nuclear reactor stored in a containment vessel is installed and a secondary building where a turbine system for exchanging heat with the reactor coolant system is installed. Drainage water drained from a safety system facility of a primary facility installed in the primary building is collected in a drainage facility installed in the primary building and the drainage water drained from a non-safety system facility of the primary facility installed in the primary building is collected in a drainage facility installed in the secondary building.

Description

  The present invention relates to a primary system facility and a secondary system drainage system of a nuclear power plant and a nuclear power plant.

  Nuclear power plants are becoming larger in size in order to accommodate high-power plants. Furthermore, the number of primary system facilities has been increased so that maintenance work can be performed during normal operation.

  Patent Document 1 describes an air conditioning facility for a nuclear power plant including four refrigerators including a spare unit as a cooling water system for the air conditioning facility. This is because three of the four units can be operated to cover the peak load, and in the event of an emergency when one of the refrigerators fails, the spare unit can be operated to provide reliable cooling water supply. is there.

  Examples of the primary system equipment configured to cope with an emergency or a periodic inspection include an emergency generator and a seawater pump of CCW (Component Cooling Water).

JP 2001-82819 A

  FIG. 8 is a configuration diagram showing an example of an air conditioning cooling water equipment system in the primary system. The A-system equipment of the primary safety air conditioning cooling water equipment includes an A room air conditioning unit 30, an A room cooling unit 32, an A safety air conditioning cold water pump 33, a safety system air conditioning cold water tank 34, and an evaporator 35. A condenser 36, a SWS (Sea Water System: Reactor Auxiliary Cooling Seawater Equipment) 37, and pipes 38 and 39 are included. In addition, the evaporator 35 and the condenser 36 are a pair and are called a chiller for safety system air conditioning.

  Here, a series of operations of the system A equipment of the primary safety air conditioning cooling water equipment will be described. The cooling water cooled by the evaporator 35 by the refrigerant of the condenser 36 of the A safety system air conditioning chiller is sent by the A safety system air conditioning cold water pump 33 and distributed to each air conditioning device through the pipe line 38. The return cooling water heated by the heat exchange in the A room air conditioning unit 30 and the A room cooling unit 32 is merged into the pipe line 39, returned to the evaporator 35 of the A safety air conditioning chiller, and cooled again. Recirculated. The refrigerant whose temperature is increased by heat exchange in the condenser 36 is cooled by the seawater of the SWS 37. The temperatures of the A room air conditioning unit 30 and the A room cooling unit 32 are controlled by the flow rate of the cooling water. This temperature control is performed by adjusting the flow rate of the cooling water by a valve provided in the pipes 38 and 39. Moreover, the cold water tank 34 for safety system air conditioning is for adjusting the amount of cooling water, and is common to the A and B system facilities.

  B system equipment (portion surrounded by broken line B) similar to the above-described A system facility (portion surrounded by broken line A) constitutes one side of the cooling water facility for primary safety air conditioning. Yes. The pair of C and D system facilities (parts surrounded by broken lines C and D) is configured in the same manner as the pair of A and B system facilities. It is composed. Therefore, the primary safety air conditioning cooling water equipment is constituted by the four A, B, C, and D system equipments. By configuring such a pair of A and B system equipment and a pair of C and D system equipment, either one of the A or B system equipment or one of the C or D system equipment is subject to periodic inspection or failure. Each air conditioner can be operated even if it stops.

  Next, the primary non-safety (ordinary) air conditioning cooling water equipment (the portion surrounded by the broken line E) includes an F cooling unit 41, a G cooling unit 42, an H cooling unit 43, an I cooling unit 44, and an A The safety system air-conditioning cold water pump 33, the safety system air-conditioning cold water tank 34, the evaporator 35, the condenser 36, the SWS 37, and the pipelines 45, 46, 47 and 48 are configured. As shown in FIG. 8, the cooling water cooled by the safety system air conditioner chillers of the four A, B, C, and D system facilities described above passes through the pipelines 45 and 47 by the cold water pumps for safety system air conditioning. Water is being sent. The return cooling water whose temperature has been raised by heat exchange in the F to I cooling units 41 to 44 returns to the A to D safety system air-conditioning chiller through the pipes 46 and 48, and is cooled again and recirculated. .

  As described above, the configuration of the cooling water facility for air conditioning in the primary system is a large-scale system in which the safety system and the non-safety (ordinary) system are integrated, and is used for all air conditioning in the primary system building. The cooling system was installed and the plant system was completed in the primary building.

  In addition to the above-described primary air conditioning cooling water facilities, many facility devices are arranged in the primary system building. A sump tank or sump pit is provided on the lowest basement floor in order to collect drainage discharged from the pipes and equipment for maintenance of the equipment. Since the wastewater discharged from each equipment is separated and collected according to the type and content of wastewater, the subsequent treatment and disposal methods, multiple sump tanks and sump pits were installed, requiring a large installation space. .

  The configuration of the conventional cooling water equipment for air conditioning has a problem that the equipment installation space in the primary system building is insufficient due to the increase in the size of the equipment and the increase in the number of equipment in order to cope with the large output plant. It was.

  In addition, wastewater discharged from each equipment is collected separately according to the type of wastewater, its components, subsequent treatment and disposal methods, so multiple sump tanks and sump pits are installed, requiring a large installation space. There was a problem that there was.

  This invention is made | formed in view of the above, Comprising: Let it be a subject to provide the 1/2 system drainage system and nuclear power plant of a nuclear power plant which can ensure the installation equipment installation space of a primary system building. .

  In order to solve the above-described problems and achieve the object, the nuclear power plant 1/2 system drainage system of the present invention is provided with a reactor cooling system including a reactor housed in a reactor containment vessel. A primary system building and a secondary system building in which a turbine system for heat exchange with the reactor cooling system is installed, and discharged from a safety system facility of the primary system equipment installed in the primary system building Drainage is collected in the drainage facility installed in the primary system building, and the drainage discharged from the non-safety system of the primary system facility installed in the primary system building is discharged to the drainage facility installed in the secondary system building. It is characterized by collecting.

  According to this configuration, in the primary system facilities, the safety system facilities and the non-safety (ordinary) system drainage facilities are separated, and the safety system drainage facilities are installed in the primary system building as before. Is done. The drainage of non-safety facilities with low management class is integrated with the drainage of secondary systems installed in the secondary system building, and the drainage of primary non-safety systems has been reduced to reduce the primary Equipment installation space can be secured in the system building.

  The nuclear power plant 1/2 primary drainage system of the present invention further includes a radiation monitor for detecting radiation in the drainage in a pipe for collecting the drainage of non-safety equipment, and blocking the drainage of the pipe downstream of the radiation monitor. It is preferable to have a shut-off valve.

  According to this configuration, it is possible to remove a part of the drain pipe on the downstream side of the valve by providing the drain pipe for discharging the waste water of the primary non-safety system with the valve for shutting off the drain pipe. . Thereby, it is possible to prevent drainage exposed to radiation from being discharged to the drainage facility of the secondary system facility in the secondary system building.

  In the nuclear power plant 1/2 system drainage system of the present invention, a part of the piping is further removable downstream of the shutoff valve, and a part of the removed piping is connected and fixed by piping and a fastener. When radiation is not detected in the wastewater by the radiation monitor, it is preferable to connect and fix a part of the removed pipe downstream of the shutoff valve to the pipe with a fastener to discharge the wastewater from the non-safety system.

  According to this configuration, it becomes possible to remove a part of the drain pipe on the downstream side of the valve that shuts off the drain pipe that discharges the drainage of the primary non-safety system. Thereby, it is possible to prevent drainage exposed to radiation from being discharged to the drainage facility of the secondary system facility in the secondary system building.

  The nuclear power plant 1/2 primary system drainage system of the present invention further includes a treatment facility for treating wastewater of non-safety facilities exposed to radiation, a pump for transferring wastewater to the treatment facility, and a wastewater treatment facility. It has a transfer pipe to transfer and a shutoff valve to shut off the drainage of the transfer pipe. When radiation is detected in the wastewater by the radiation monitor, the shutoff valve of the transfer pipe is opened and the wastewater is transferred to the treatment facility by the pump. It is preferable to process.

  According to this configuration, it becomes possible to transfer wastewater exposed to radiation directly to the treatment facility, and the drainage facility of the non-safety system is integrated with the drainage facility of the secondary system installed in the secondary system building. It is possible to reduce the drainage of primary non-safety facilities. This makes it possible to secure equipment installation space in the primary building.

  A nuclear power plant according to the present invention includes the above-described nuclear power plant half-primary drainage system.

  According to this configuration, in the primary system facilities, the safety system facilities and the non-safety (ordinary) system drainage facilities are separated, and the safety system drainage facilities are installed in the primary system building as before. Is done. The drainage of non-safety facilities with low management class is integrated with the drainage of secondary systems installed in the secondary system building, and the drainage of primary non-safety systems has been reduced to reduce the primary Equipment installation space can be secured in the system building. In addition, the drainage of the primary non-safety system is monitored by a radiation monitor, and a valve that shuts off the drain pipe is provided on the downstream side, so that a part of the drain pipe on the downstream side of the valve can be removed. It is possible to prevent the drainage exposed to radiation from being discharged to the drainage facility of the secondary system facility in the secondary system building.

  According to the 1/2 primary system drainage system and nuclear power plant of the nuclear power plant of the present invention, the safety system equipment and the non-safety (ordinary) system equipment are separated from the non-safety system equipment in the primary system equipment. By collecting the discharged wastewater into the drainage system of the secondary system installed in the secondary system building, the drainage system of the non-safety system in the primary system building is reduced, and the equipment installation space of the primary system building is reduced. It can be secured.

FIG. 1 is a schematic configuration diagram schematically showing a nuclear power plant to which a 1 / 2-order cooling water system according to the present embodiment is applied. FIG. 2 is a block diagram of the drainage facility of the primary facility according to the present embodiment. FIG. 3 is a configuration diagram illustrating an example of a drainage facility of a conventional primary system facility. FIG. 4 is a perspective view showing a separated state of the drain pipe of the non-safety facility according to the present embodiment. FIG. 5 is a side view of the drain pipe of the non-safety facility in FIG. FIG. 6 is a perspective view showing a state where the drain line of the non-safety facility according to the present embodiment is connected. FIG. 7 is a side view of the drain pipe of the non-safety facility in FIG. FIG. 8 is a configuration diagram showing an example of a cooling water equipment system for air conditioning in a conventional primary system.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a nuclear power plant 1 / 2-system drainage system and a nuclear power plant according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this Example. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic configuration diagram schematically illustrating a nuclear power plant to which a 1 / 2-order drainage system according to an embodiment of the present invention is applied.

  The nuclear reactor 5 of the nuclear power plant 1 to which the present embodiment is applied uses light water as a reactor coolant and a neutron moderator, and generates high-temperature and high-pressure water that does not boil throughout the primary system. It is a pressurized water reactor (PWR) that generates steam by sending it to a vessel and exchanging heat with the secondary coolant, and sends this steam to a turbine generator to generate electricity. In addition, a present Example is applicable not only to this PWR but the improved pressurized water reactor (APWR: Advanced Pressurized Water Reactor) which improved this. Moreover, it is applicable also to the other power generation plant provided with the safety system and the non-safety system equipment.

  A nuclear power plant 1 using a nuclear reactor 5 includes a reactor cooling system 3 including a nuclear reactor 5 installed in a primary system building, and a turbine that exchanges heat with the reactor cooling system 3 installed in a secondary system building. A reactor coolant is circulated in the reactor cooling system 3, and a secondary coolant is circulated in the turbine system 4.

  The reactor cooling system 3 includes a nuclear reactor 5 and a steam generator 7 connected to the nuclear reactor 5 through a cold leg 6a and a hot leg 6b. In addition, a pressurizer 8 is interposed in the hot leg 6b, and a reactor coolant pump 9 is interposed in the cold leg 6a. The reactor 5, the cold leg 6 a, the hot leg 6 b, the steam generator 7, the pressurizer 8, and the reactor coolant pump 9 are accommodated in the reactor containment vessel 10.

  The reactor 5 is a pressurized water reactor as described above, and the inside thereof is filled with a reactor coolant. In the nuclear reactor 5, a large number of fuel assemblies 15 are accommodated, and a large number of control rods 16 for controlling nuclear fuel fission in the fuel rods of the fuel assemblies 15 can be inserted into the fuel assemblies 15. Is provided.

  When the nuclear fuel in the fuel rod of the fuel assembly 15 is fissioned while controlling the fission reaction by the control rod 16, thermal energy is generated by this fission. The generated thermal energy heats the reactor coolant, and the heated reactor coolant is sent to the steam generator 7 via the hot leg 6b. On the other hand, the reactor coolant sent from each steam generator 7 via the cold leg 6 a flows into the reactor 5 and cools the reactor 5.

  The pressurizer 8 interposed in the hot leg 6b suppresses boiling of the reactor coolant by pressurizing the reactor coolant that has become high temperature. Moreover, the steam generator 7 generates steam by evaporating the secondary coolant by exchanging heat with the secondary coolant at a high temperature and high pressure, and at the high temperature and pressure. The furnace coolant is being cooled. The reactor coolant pump 9 circulates the reactor coolant in the reactor cooling system 3, and sends the reactor coolant from the steam generator 7 to the reactor 5 through the cold leg 6 a, and also the reactor coolant. From the nuclear reactor 5 to the steam generator 7 through the hot leg 6b.

  The reactor coolant circulates between the reactor 5 and the steam generator 7. The reactor coolant is light water used as a coolant and a neutron moderator.

  The turbine system 4 connects a turbine 22 connected to each steam generator 7 through a steam pipe 21, a condenser 23 connected to the turbine 22, and the condenser 23 and each steam generator 7. And a water supply pump 24 interposed in the water supply pipe 26. A generator 25 is connected to the turbine 22.

  Here, a series of operations in the turbine system 4 of the nuclear power plant 1 will be described. When steam flows from the steam generator 7 into the turbine 22 via the steam pipe 21, the turbine 22 rotates. When the turbine 22 rotates, the generator 25 connected to the turbine 22 generates power. Thereafter, the steam discharged from the turbine 22 flows into the condenser 23. The condenser 23 has a cooling pipe 27 disposed therein, and one of the cooling pipes 27 is connected to a water intake pipe 28 for supplying cooling water (for example, seawater). A drain pipe 29 for draining the cooling water is connected to. The condenser 23 cools the steam flowing in from the turbine 22 by the cooling pipe 27, thereby returning the steam to a liquid. The secondary coolant that has become liquid is sent to the steam generator 7 through the feed water pipe 26 by the feed water pump 24. The secondary coolant sent to the steam generator 7 becomes steam again by exchanging heat with the reactor coolant in the steam generator 7.

  Next, the drainage facility of the primary system facility of this embodiment will be described with reference to FIGS. 2 and 3.

  FIG. 2 is a block diagram of the drainage facility of the primary facility according to the present embodiment. FIG. 3 is a configuration diagram illustrating an example of a drainage facility of a conventional primary system facility. In FIG. 3, the same parts as those in the embodiment shown in FIG.

  The nuclear power plant 1 of this embodiment has a configuration in which the safety system facilities and the non-safety (ordinary) system drainage facilities are separated from the primary system facilities, and the safety system drainage facilities are the primary system buildings as before. Installed indoors. The drainage of non-safety facilities with a low management class is integrated with the drainage of secondary systems installed in the secondary system building, and the drainage of primary non-safety systems is reduced. . This makes it possible to secure equipment installation space in the primary building. In addition, by monitoring the drainage of the primary non-safety system with a radiation monitor and providing a valve on the downstream side to shut off the drainage pipe, it becomes possible to remove the drainage pipe on the downstream side of the valve. It is possible to prevent the exposed wastewater from being discharged to the drainage facility of the secondary system in the secondary system building. Safety-related equipment is equipment installed in the controlled area (exposed to radiation), and non-safety equipment is equipment installed in the non-managed area (not exposed to radiation). Non-safety equipment is also described as regular equipment.

  With reference to FIG.2 and FIG.3, the drainage equipment structure of the primary system installation in the primary system building of a present Example and the drainage equipment structure of the secondary system equipment in a secondary system building are demonstrated in detail.

  The embodiment shown in FIG. 2 collects fresh water drainage between the non-safety facilities 51 and 52 in the reactor building 12 of the primary building 11 and the non-safety facility 61 in the auxiliary building 13. The radioactive sump tank 54 was reduced. The fresh water drainage of the primary system building 11 is drained to a fresh water sump pit (drainage facility) 72 installed in the secondary system building 14, thereby making it possible to secure the equipment installation space in the primary system building.

  In the conventional example shown in FIG. 3, the fresh water drainage of the non-safety equipment 51 and 52 in the reactor building 12 and the non-safety equipment 61 in the auxiliary building 13 is in the reactor building 12 of the primary building 11. R / B non-radioactive sump tank 54. When a certain amount of drainage accumulated in the R / B non-radioactive sump tank 54, freshwater drainage was transferred to the freshwater sump pit 72 in the secondary system building 14 by a pump (not shown).

  The primary system building 11 according to the embodiment includes a reactor building 12 including a reactor containment vessel 10 and an auxiliary building 13. The secondary system building 14 is composed of a turbine building including a generator. As shown in FIG. 2, the drainage facility of the primary building 11 includes an R / B sump tank 55 and a spring sump tank 56 installed in the reactor building 12 and an A / B sump installed in the auxiliary building 13. And a tank 63. The drainage facility of the secondary system building 14 includes a fresh water sump pit 72 and a seawater sump pit 73.

  The R / B sump tank 55 in the reactor building 12 is a tank that collects freshwater wastewater such as equipment drainage, non-radioactive equipment drainage, and CCW drainage that is the safety system facility 50 in the management area. When a certain amount of fresh water wastewater is accumulated in the R / B sump tank 55, the freshwater wastewater is transferred to a WDS (waste water treatment facility) 62 by a pump not shown. The spring water sump tank 56 is a tank for collecting spring water 53 in an unmanaged area and fresh water drainage such as CCW cooler seawater side drain drainage. When a certain amount of freshwater drainage is accumulated in the spring sump tank 56, the freshwater drainage is discharged outside the primary system building 11 by a pump (not shown). In addition, the upper side from the broken line A in the figure is the safety system facility in the management area, and the lower side from the broken line A is the non-safety system facility in the non-management area.

  The A / B sump tank 63 in the auxiliary building 13 is a tank that collects freshwater drainage such as drainage equipment drainage and floor drainage that is a safety system facility 60 in the management area. When a certain amount of fresh water drainage is accumulated in the A / B sump tank 63, the fresh water drainage is transferred to the WDS 62 by a pump (not shown) and processed.

  The fresh water sump pit 72 in the secondary system building 14 is the primary system equipment / floor drain drainage, non-radioactive drainage drainage, CCW drainage drainage which is the non-safety system equipment 51 and 52 of the primary system equipment in the reactor building 12. This is a pit for collecting fresh water drainage such as AFWP (auxiliary water pump) drainage by pipes 83, 84, 85 and pipe 91. Further, the fresh water sump pit 72 is a pit for collecting fresh water drainage such as non-radioactive equipment drainage and CCW drainage which is the non-safety facility 61 in the auxiliary building 13 through the pipe line 92. In addition, the fresh water sump pit 72 collects fresh water drainage such as secondary drainage equipment floor drain pump blow drainage, secondary drainage equipment cleanup drainage, blowdown tank drainage, etc., which is a non-safety facility 70 of the secondary system. It is a pit. When a certain amount of fresh water drainage accumulates in the fresh water sump pit 72, the fresh water drainage is transferred to a waste water treatment facility 74 by a pump (not shown). The seawater sump pit 73 is a pit for collecting seawater drainage such as seawater blow drainage of the secondary system equipment which is the non-safety system equipment 71 of the secondary system. When a certain amount of freshwater drainage is accumulated in the seawater sump pit 73, the freshwater drainage is transferred to the monitoring water tank 75 or the discharge pit 76 by a pump (not shown).

  Conventionally, as shown in FIG. 3, primary system equipment / floor drainage, non-radioactive drainage, CCW drainage, AFWP (auxiliary) which are non-safety systems 51 and 52 of the primary system in the reactor building 12 Fresh water drainage such as (water supply pump) drainage was collected in the R / B non-radioactive sump tank 54 in the reactor building 12 through the pipeline 101 and the pipeline 102. In addition, fresh water drainage such as non-radioactive equipment drainage drainage and CCW drainage drainage which is non-safety system equipment 61 in the auxiliary building 13 is piped to the R / B nonradioactive sump tank 54 in the reactor building 12 of the primary building 11. It was collected on Road 103. When a certain amount of freshwater drainage accumulated in the R / B non-radioactive sump tank 54, the freshwater drainage was transferred to the freshwater sump pit 72 by a pipe 104 using a pump (not shown). Fresh water drainage such as secondary system equipment / floor drain pump blow drainage, secondary system equipment cleanup drainage, blowdown tank drainage, etc., which is a non-safety system 70 of secondary system equipment in the secondary system building 14, It was collected in the fresh water sump pit 72 in the secondary system building 14. Thus, conventionally, the facility wastewater of the primary system building 11 is collected by the drainage facility in the primary system building 11, and the facility wastewater of the secondary system building 14 is collected by the drainage facility in the secondary system building 14. It was a system for indoor processing.

  Next, the drainage facility of the non-safety facility 51 of this embodiment will be described with reference to FIGS. The CCW drain drainage facility will be described below as an example, but the present invention is not limited to this.

  FIG. 4 is a perspective view showing a separated state of the drain pipes 83, 84, 85 of the non-safety facility 51. FIG. 5 is a view of the drainage pipe of the non-safety facility 51 as viewed from the side. FIG. 6 is a perspective view showing a state in which the drain pipes 83, 84, 85 of the non-safety facility 51 are connected. FIG. 7 is a view of the drain pipe of the non-safety facility 51 as viewed from the side.

  The CCW drain drainage of the non-safety facility 51 in the unmanaged area is discharged when it is determined that the replacement is necessary in the periodic inspection, and is not always discharged. As shown in FIGS. 2, 4 and 5, when discharging the CCW drain drainage into the fresh water sump pit 72, the pipe 83, the pipe 84, and the pipe 85 are connected from the upstream side to form one drain pipe. A road is constructed and the CCW drainage is discharged into the fresh water sump pit 72. A valve 82 that shuts off the pipe 83 is provided in the pipes 83, 84, 85 of the CCW drain drainage, which is the non-safety facility 51 in the non-managed area in the reactor building 12, and the pipe 83 on the downstream side of the valve 82 The pipe 84 between the pipe 85 and the pipe 85 can be removed. Further, a radiation monitor 81 for detecting whether or not the CCW drain drainage is exposed to radiation is installed on the upstream side of the valve 82 of the pipe line 83. That is, the drainage pipe for discharging the CCW drain drainage to the fresh water sump pit 72 is a pipe line provided with the radiation monitor 81 on the most upstream side and the valve 82 on the downstream side when the CCW side is upstream and the fresh water sump pit 72 side is downstream. 83, there is a pipe 84 that can be removed immediately downstream of the pipe 83, and there is a pipe 85 that is connected to the fresh water sump pit 72 immediately downstream of the pipe 84.

  As shown in FIG. 4, the pipe 83 after the pipe 84 is removed is covered with a sealing plate 86 attached with bolts 95. Similarly, the downstream pipe 85 is covered with a sealing plate 89 attached with a bolt 98. The removed pipe line 84 is stored with sealing plates 87 and 88 attached to both sides with bolts 96 and 97 and covered. Normally, when connecting as shown in FIGS. 4 and 5, the pipes 84 of the pipes 83, 84, and 85 constituting one drain pipe are removed, and the CCW drain drainage is discharged from the secondary system building. The pipe 83 and the pipe 85 discharged to the 14 fresh water sump pits 72 are physically cut.

  In addition, as shown in FIG. 2, the non-safety system 51 is provided with a transfer pipe line 93 for transferring CCW drain drainage with a pump 95 to the WDS 62 in the management area in the auxiliary building 13. A valve 94 for blocking the transfer pipeline 93 is installed on the upstream side of the transfer pipeline 93 on the non-safety facility 51 side. The CCW of the non-safety facility 51 is equipment installed in an unmanaged area, but the CCW piping may be exposed to radiation because a part of the piping passes through the managed area (arrow 80). . Therefore, by providing the above-described configuration, before the CCW drain drainage is discharged to the fresh water sump pit 72 in the secondary system building 14, the radiation is measured by the radiation monitor 81. 93, the valve 94 is opened, and the CCW drain water is transferred to the WDS 62 by the pump 95 so that the waste water can be treated.

  Here, the drain operation of the non-safety facility 51 of the embodiment will be described. When it is determined that the CCW needs to be replaced during the periodic inspection, the radiation monitor 81 first checks whether the CCW drain drain is exposed to radiation. When the CCW drain drainage is not exposed to radiation, after the pipe 84 that has been removed is mounted between the pipe 83 and the pipe 85 as shown in FIGS. The open CCW drain drainage is discharged to the fresh water sump pit 72 in the secondary system building 14. On the other hand, when the CCW drain drainage is exposed to radiation, the conduit 84 is removed as shown in FIGS. 4 and 5, the valve 94 that shuts off the transfer conduit 93 is opened, and the pump 95 is opened. Then, the CCW drain drainage is transferred to the WDS 62 in the auxiliary building 13 and the drainage treatment is performed by the WDS 62.

  In this way, when the CCW of the non-safety system 51 is not exposed to radiation, the pipe 83, the pipe 84, and the pipe 85 are connected from the upstream side to form one drain pipe, and the CCW Drainage is discharged into the fresh water sump pit 72 of the secondary system building 14. When CCW has been exposed to radiation, the valve 94 is opened and the CCW drain drainage is transferred to the WDS 62 by the pump 95 and the transfer line 93 to be processed in the reactor building 12 of the primary building 11. The R / B non-radioactive sump tank 54 that has been used can be reduced.

  According to the embodiment, in the primary system equipment, the safety system equipment and the drainage equipment of the non-safety (ordinary) system equipment are separated, and the drainage equipment of the safety system equipment is installed in the primary system building as before. Is done. The drainage of non-safety facilities with low management class is integrated with the drainage of secondary systems installed in the secondary system building, and the drainage of primary non-safety systems has been reduced to reduce the primary It became possible to secure the equipment installation space in the system building.

  In addition, a radiation monitor that detects radiation is installed in the drainage pipe that drains the primary non-safety equipment drainage into the secondary system drainage equipment in the secondary building, and the drainage pipe is shut down downstream. By providing the valve, it is possible to remove the drain pipe on the downstream side of the valve, and it is possible to prevent drainage exposed to radiation from being discharged to the drainage facility of the secondary system facility in the secondary system building.

  As described above, the half-drainage system and the nuclear power plant of the nuclear power plant according to the present invention are useful for securing the equipment installation space of the primary system building, and particularly the safety system and the non-safety system. Suitable for plants with system facilities.

DESCRIPTION OF SYMBOLS 1 Nuclear power plant 3 Reactor cooling system 4 Turbine system 5 Reactor 10 Reactor containment vessel 11 Primary system building 12 Reactor building 13 Auxiliary building 14 Secondary system building 30 Room A air conditioning unit 35 Evaporator 36 Condenser 37 SWS (Reactor auxiliary cooling seawater equipment)
41 F cooling unit 42 G cooling unit 43 H cooling unit 44 I cooling unit 50, 60 Safety system equipment 51, 52, 61, 70, 71 Non-safety system equipment 54 R / B non-radioactive sump tank 55 R / B sump tank 56 Spring water sump tank 62 WDS (Wastewater treatment facility)
63 A / B sump tank 72 Fresh water sump pit 73 Seawater sump pit 81 Radiation monitor 82, 94 Valve 83, 84, 85, 91, 92 Line 93 Transfer line 95 Pump

Claims (5)

A primary building in which a reactor cooling system including a reactor housed in a reactor containment vessel is installed;
A secondary system building in which a turbine system for heat exchange with the reactor cooling system is installed,
The waste water discharged from the safety system equipment of the primary system equipment installed in the primary system building is collected in the drainage equipment installed in the primary system building,
The waste water discharged from the non-safety system of the primary system installed in the primary system building is collected in the drain system installed in the secondary system building. Secondary drainage system. A radiation monitor for detecting radiation in the wastewater in a pipe for collecting wastewater of the non-safety system;
A shutoff valve that shuts off the drainage of the pipe downstream of the radiation monitor;
A 1 / 2-order drainage system for a nuclear power plant according to claim 1, wherein The pipe has a structure in which a part of the pipe is removable on the downstream side of the shutoff valve, and a part of the removed pipe is connected and fixed by the pipe and a fastener.
When the radiation monitor does not detect radiation in the drainage, a part of the pipe removed downstream of the shutoff valve is connected and fixed to the pipe by the fastener, and the drainage of the non-safety system is discharged. A 1 / 2-order drainage system for a nuclear power plant according to claim 2. A treatment facility for treating the wastewater of the non-safety facility exposed to radiation;
A pump for transferring the waste water to the treatment facility;
A transfer pipe for transferring the waste water to a treatment facility;
A shutoff valve that shuts off the drainage of the transfer pipe,
3. The nuclear power according to claim 2, wherein when radiation is detected in the wastewater by the radiation monitor, the shutoff valve of the transfer pipe is opened, and the wastewater is transferred to the treatment facility by the pump to be processed. 1/2 drainage system for power plant.   A nuclear power plant comprising the 1 / 2-order drainage system according to any one of claims 1 to 4.

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