JPH0647895U - Mock-up test device for integrated pressurized water reactor - Google Patents

Abstract

(57) [Summary] [Purpose] A demonstration test is conducted on an integrated pressurized water reactor by simulating the core with an electric heater. According to the mock-up test apparatus of the present invention, a cooling water circulation simulation system 10 is formed by connecting a circulation pump 12 and a steam generator 13 in a closed loop to a pressure vessel 11 in which an electric heater 14 is built in a core portion in advance. And the lower end of the furnace stop liquid storage tank 21 is connected to the lower side of the electric heater 14 in the pressure vessel 11, and a water pressure operating valve 23 that operates by the discharge pressure of the circulation pump 12 is installed at the upper end of the tank 21. And a simulated system 20 for injecting the reactor stop solution.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mock-up test device for an integrated pressurized water reactor.

[0002]

[Prior art]

 From the viewpoint of simplifying the safety system and the reactor system, an integrated pressurized water reactor (SPWR) has been proposed that eliminates the control rod and integrates the main cooling system.

In such an integrated pressurized water reactor, as shown in FIG. 3, inside a pressure vessel 1, a poison tank 3 storing boric acid water as a reactor stop solution, and a circulation pump for circulating primary cooling water in the reactor 4. A steam generator 5 is provided to take out steam by exchanging heat between the circulating primary cooling water and the secondary cooling water from the outside. At any time, the circulation pump 4 generates the primary cooling water heated in the core 2 to generate steam. After being pressure-fed to the vessel 5, heat is given to the secondary cooling water there, it is returned to the lower side of the core 2 through the passage 6 on the outer peripheral side of the tank 3.

On the other hand, a water pressure operating valve 7 is installed above the poison tank 3 in order to stop the furnace when there is an abnormality such that the discharge pressure of the circulation pump 4 decreases. The water pressure operated valve 7 is closed during normal operation of the furnace, but automatically opens when the discharge pressure of the circulation pump 4 drops, and boric acid water in the tank 3 is injected into the core 2.

[0005]

[Problems to be solved by the device]

 By the way, in constructing the integrated pressurized water reactor as described above, it is necessary to prove in advance that the concept of the reactor is established. A mockup test device was proposed. However, it was found that if a test device was manufactured using a full-scale model, the electric heater would require an enormous electric output (about 300,000 kW), which is not feasible.

Therefore, it is conceivable to limit the size of the test device according to the electric output (about 330,000 kw) actually obtained. However, in order to obtain the same natural convection as the actual machine, the head difference (pressure difference) of the cooling water, etc. in the test equipment must be set to the same as that of the actual machine. However, the structure is the same as the actual machine, but only the diameter is reduced, and it becomes impossible to incorporate a steam generator, poison tank, etc. in construction.

Assuming that the electric output actually obtained is 1/100 (300,000 kw → 30 thousand kw) of the electric output required for the full-scale model, the diameter of the test apparatus is 1/10 (flow rate) of the actual machine. The road cross-sectional area must be 1/100 of the actual machine). Now, assuming that the diameter of the actual machine is 6 m, the diameter of the test equipment will be 60 cm, and it is impossible to incorporate the above-mentioned various devices at all.

An object of the present invention is to provide a mockup test apparatus capable of conducting a verification test on an integrated pressurized water reactor even when the core is simulated by an electric heater.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the mock-up test apparatus of the present invention has a circulation pump, a steam generator, and a reactor stop solution storage tank which are to be installed in a pressure vessel in the previously planned integrated test apparatus. It is taken out and connected by piping. That is, a cooling water circulation simulation system formed by connecting a circulation pump and a steam generator in a closed loop to a pressure vessel having an electric heater built in the core in advance, and a reactor stop solution below the electric heater in the pressure vessel. The reactor bottom liquid injection simulation system is formed by connecting the lower end of the storage tank to the upper end of the storage tank and installing a water pressure operation valve that operates by the discharge pressure of the circulation pump at the upper end of the tank.

[0010]

[Action]

 According to this invention, by separately installing the steam generator, the reactor shutdown liquid storage tank, etc., it is not necessary to install these steam generators, etc. in the pressure vessel, and the radial dimension in the pressure vessel is greatly increased. Can be reduced. Therefore, even when the core is simulated with an electric heater, it is possible to conduct a verification test by energizing this electric heater with a realistic electric output.

[0011]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the mockup test apparatus of the present invention. This mock-up test device simulates a cooling water circulation simulation system 10 that simulates the circulation flow of primary cooling water in an actual machine (SPWR), and a reactor shutdown system when the discharge pressure of the circulation pump 4 (Fig. 3) decreases. It mainly comprises a reactor stop liquid injection simulating system 20 and a pressure equalizing injection simulating system 30 simulating the reactor stop system when the water level in the pressure vessel 1 is lowered.

As shown in the figure, the cooling water circulation simulation system 10 is formed by connecting a pressure vessel 11, a circulation pump 12 and a steam generator 13 in a closed loop. Here, the space inside the pressure vessel 11 is the flow path 11a of the primary cooling water, the dimension of the flow path 11a in the height direction is the same as the actual machine, and the dimension in the radial direction (the inner diameter of the vessel 11) is the same as that of the real machine. Each is set to about 1/10. The suction port of the circulation pump 12 is connected to the space inside the pressure container 11, that is, the flow path 11a, through a suction line 16 branched from a predetermined height position of the container 11, and is connected to the discharge port of the circulation pump 12. Is connected to the water inlet of the steam generator 13 via a discharge line 17. On the other hand, an electric heater 14 simulating a reactor core is installed at the bottom of the pressure vessel 11, and the drain port of the steam generator 13 is connected below the heater 14 by a return line 18.

The furnace stop solution injection simulation system 20 is formed by connecting a poison tank (furnace stop solution storage tank) 21 to the pressure vessel 11. Like the pressure vessel 11, the poison tank 21 has the same height dimension as that of the actual machine and the inner diameter thereof is set to about 1/10 of that of the actual machine. The lower end of the poison tank 21 is communicated with the lower portion of the heater 14 in the pressure vessel 11 via an injection line 22, and the upper end of the poison tank 21 is a hydraulic valve that operates when the discharge pressure of the circulation pump 12 decreases. 23 are installed. The water pressure operation valve 23 is automatically opened when the discharge pressure of the circulation pump 12 applied through the pressure guiding line 24 is lowered, and the cooling water in the pressure vessel 11 is injected through the injection line 25 into the poison tank 21. Inject. Here, the poison tank 21 is filled with boric acid water having a larger specific gravity than the cooling water in the pressure vessel 11, and by opening the hydraulically operated valve 23, the boric acid water in the tank 21 is injected into the injection line. It is injected into the pressure vessel 11 through 22. The cooling water introduced from the circulation pump 12 to the hydraulic pressure actuating valve 23 through the pressure guiding line 24 is returned to the pressure vessel 11 through the return line 26.

FIG. 2 shows an example of the hydraulically operated valve 23. The water pressure operation valve 23 has an upper water pressure chamber 23a and a lower water pressure chamber 23b which are partitioned in a liquid-tight state with each other, and in normal operation, the discharge water introduced to the upper water pressure chamber 23a through the pressure transmission line 24. The piston 23c is pushed up by the output pressure so that the valve body 23d is seated on the valve seat 23e, and the lower hydraulic chamber 23b is shut off from the inside of the poison tank 21. Further, when the discharge pressure of the circulation pump 12 decreases, the weight of the weight 23f pulls down the piston 23c to open the valve body 23d, so that the lower hydraulic chamber 23b communicates with the inside of the poison tank 21. Since the cooling water in the pressure vessel 11 is guided to the lower hydraulic chamber 23b by the line 25, the cooling water is introduced into the poison tank 21 at the same time as the valve body 23d is opened. Becomes

As shown in FIG. 1, the pressure equalization injection simulation system 30 has a pressure equalization tank 33 connected to the pressure vessel 11 in a closed loop shape, and the water level in the pressure vessel 11 is lowered to a predetermined level or lower. At that time, the boric acid water in the pressure equalizing tank 33 is injected into the pressure vessel 11. That is, water injection valves 34 and 35 are respectively provided in the injection line 31 and the pressure equalization line 32 that connect the pressure equalizing tank 33 and the pressure vessel 11, and the water pressure operating valves 34 and 35 are provided with a valve drive pump 36. The discharge pressure is applied through the pressure guiding line 37. The suction port of the valve drive pump 36 communicates with the pressure vessel 11 at a predetermined height level A, and is applied to the water pressure actuated valves 34 and 35 when the water level in the pressure vessel 11 drops below the level A. There is no pressure. The cooling water led from the valve drive pump 36 to the hydraulic pressure actuating valves 34, 35 through the pressure guiding line 37 is returned to the pressure vessel 11 by the return line 38.

Next, the operation of the mockup test apparatus having the above configuration will be described.

The primary cooling water in the pressure vessel 11 is heated by the electric heater 14 at any time to rise, and is sent under pressure to the steam generator 13 via the circulation pump 12. The cooling water sent to the steam generator 13 gives heat to the secondary cooling water there, and then returns to the inside of the pressure vessel 11 through the return line 18 and is heated again by the electric heater 14 to go through the above path. It will circulate. During the circulation of the cooling water, a part of the cooling water discharged from the circulation pump 12 is guided to the hydraulically operated valve 23 through the pressure guiding line 24 and returned to the pressure vessel 11 through the return line 26. Now, when the circulation pump 12 is operating normally, the hydraulic pressure operated valve 23 is maintained in the closed state due to the discharge pressure of the pump 12, but the discharge pressure of the pump 12 due to the stop of the circulation pump 12, etc. When a situation in which the water pressure is lowered occurs, the hydraulically operated valve 23 is opened. As a result, the cooling water in the pressure vessel 11 is injected into the poison tank 21 through the injection line 25, while the boric acid water in the poison tank 21 is injected into the pressure vessel 11 through the injection line 22.

If the cooling water is leaked from the discharge line 17 on the assumption that the pipe is broken, the water level in the pressure vessel 11 will be lowered. Now, when the water level in the pressure vessel 11 drops below the set level A, the cooling water is no longer sucked into the valve drive pump 36, and the discharge pressure applied from the pump 36 to the hydraulically operated valves 34, 35 disappears. At this time, since the pressure in the pressure equalizing tank 33 is much smaller than the pressure in the pressure vessel 11, first, one of the water pressure actuated valves 34 is opened to prevent the steam in the pressure vessel 11 from being opened. It is sent to the pressure equalizing tank 33 through the pressure equalizing line 31. After that, when the pressure equalizing tank 33 and the pressure vessel 11 are brought into a pressure equalizing state, the other water pressure actuating valve 35 is also opened, and the boric acid water in the pressure equalizing tank 33 passes through the injection line 32 and enters the pressure vessel 11. Is injected into.

As described above, according to the present embodiment, the circulation pump 12, the steam generator 13, and the poison tank 21 are installed outside the pressure vessel 11, and these are connected by piping to form a mock-up device. It is not necessary to incorporate the steam generator 13 or the like into the pressure vessel 11, and it is possible to significantly reduce the diameter of the pressure vessel 11. Therefore, when the electric heater 14 is applied to the core part, it becomes possible to obtain the same heat flow as the actual machine by using the existing power source for the heater 14, so that the verification test for the actual machine is sound. Can be done.

Further, according to the present embodiment, by installing the circulation pump 12, the steam generator 13 and the like outside the pressure vessel 11, various sensors such as a densitometer, a thermometer and a pressure gauge used in the verification test can be provided. It can be attached from the outside of the device. That is, in the conventional integrated test apparatus, various sensors have to be incorporated in the pressure vessel, and the work such as mounting and replacement is complicated, but various sensors are mounted on the outer peripheral surface of the pressure vessel 11 or the like. If it can be installed, the work such as installation and replacement will be extremely easy.

Further, according to this embodiment, since the poison tank 21 is formed separately from the pressure vessel 11, a normal (commercially available) heat insulating material for the poison tank 21 can be used. Usually, it is desirable that the poison tank of the actual equipment is provided with a heat insulating material in order to ensure natural circulation of boric acid water to keep the temperature of boric acid water lower than the temperature of cooling water. In this case, in the conventional integrated test apparatus, it is necessary to use the same underwater heat insulating material as the actual machine, but in the test apparatus of this embodiment, the heat insulating material is provided on the outer peripheral side of the poison tank 21. By installing it, you can avoid using underwater insulation.

[0023]

[Effect of device]

 In short, according to the present invention, the demonstration test of the integrated pressurized water reactor can be performed by the mock-up test device simulating the core with the electric heater.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a mockup test apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a hydraulically operated valve applied to a mockup test device.

FIG. 3 is a diagram showing a schematic configuration of an integrated pressurized water reactor.

[Explanation of symbols]

 10 Cooling Water Circulation Simulation System 11 Pressure Vessel 12 Circulation Pump 13 Steam Generator 14 Electric Heater 20 Reactor Stop Solution Injection Simulation System 21 Poison Tank (Reactor Stop Solution Storage Tank) 23 Water Pressure Operated Valve 30 Equal Pressure Injection Simulation System

Claims (1)

[Scope of utility model registration request] 1. A cooling water circulation simulation system which is formed by connecting a circulation pump and a steam generator in a closed loop to a pressure vessel having an electric heater built in the core in advance, and a furnace below the electric heater in the pressure vessel. And a reactor stop solution injection simulation system formed by connecting a lower end of the stop solution storage tank to the upper end of the tank and installing a hydraulically operated valve that operates by the discharge pressure of the circulation pump at the upper end of the tank. Mock-up test equipment for integrated pressurized water reactor.