KR101548873B1 - Hydraulic system for bottom-mounted second shutdown drive mechanism - Google Patents

Abstract

The present invention relates to a hydraulic system for bottom-mounted second shutdown drive mechanism. The hydraulic system can improve space availability according to the installation of a bottom-mounted hydraulic system. Approach and maintenance are facilitated when a reactor is stopped. Also, design margin for a bottom-mounted driving device can be improved. The hydraulic system for bottom-mounted second shutdown drive mechanism includes a tank which is installed at the lower part of a bath and stores the water of the bath; a pump which absorbs and pressurizes the water stored in the tank, and supplies the water to a vertical cylinder assembly; and a water-intake line which connects the bath and the tank and supplies the water of the bath to the tank. The hydraulic system having a pressure boundary and a leak tightness boundary is installed in a reactivity control device room located in the lower part of the bath.

Description

Technical Field [0001] The present invention relates to a hydraulic system for a bottom-mounted secondary shutdown drive mechanism,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulics system for driving a secondary stationary drive device installed at a lower portion of a research reactor and, more particularly, The present invention relates to a hydraulics system for driving a secondary drive installed at a lower portion of a research reactor, which can easily be accessed when the reactor is stopped and can be easily maintained, and can increase the design margin for the lower installation drive.

In research reactors, the secondary stop drive is a drive that is applied in an alternative (alternative) and independent manner to ensure dual safety, independent of the control rod drive that performs the primary stop function for shutdown of the reactor .

In the conventional secondary stop drive apparatus, during the normal operation, the secondary stop rod is held by the hydraulic system and the hydraulic cylinder assembly to the upper portion of the core, and falls into the core within a predetermined time by the stop signal of the reactor during the abnormal operation Stop the reactor.

FIG. 1 is a conceptual view showing a state in which a tube-line is installed at an upper portion of a reactor water tank, and a hydraulic system 30 for providing a hydraulic force to the secondary stop drive apparatus of the conventional research reactor.

As shown in FIG. 1, a conventional research reactor upper-mounted secondary stationary driving apparatus 10 includes a secondary shutdown rod 1 for stopping a reactor, an upper guide (not shown) of a research reactor 20, And a hydraulic cylinder assembly (5) installed on the inner wall of the structure (9) for driving the secondary stopper rod (1) to lift up the upper stopper rod (1) by the hydraulic force provided by the external hydraulic system (30).

The hydraulic cylinder assembly 5 is interconnected with the hydraulic system 30 located at the upper part of the water tank through the plurality of tube lines 12 so that hydraulic pressure can be supplied to the inside. In this case, the hydraulic cylinder assembly 5 is installed in the water tank and is not designed as a separate pressure boundary or leak tight boundary because the hydraulic system 11 is installed above the water tank water level.

The upper stationary secondary stationary drive device 10 is configured such that the hydraulic pressure applied from the hydraulic system 30 to the inlet port formed on the outer surface of the hydraulic cylinder assembly 5 during normal operation causes the secondary stationary rod 1 to move toward the upper portion of the core It is pushed up and held up.

On the other hand, when the stoppage of the reactor 20 is required, if the hydraulic pressure flowing into the inlet port of the hydraulic cylinder assembly 5 is lost by the function of the hydraulic system 30, the secondary stopper rod 1 falls downward, So that the reactor 20 is stopped.

However, the above-mentioned conventional stationary secondary drive device includes a hydraulic cylinder assembly 5 for driving the secondary stationary rod 1, a track for transferring or guiding the driving force, a conveying car, a secondary stop rod guide pipe, Or so that the core is obscured and the accessibility to the inside of the reactor core and the accessibility to the nuclear reactor test space due to the plurality of tube lines connected from the hydraulic system 30 to the hydraulic cylinder assembly 5 It gives a lot of restrictions. Therefore, there is a problem in that research and utilization efficiency and economical efficiency of the research reactor are deteriorated because the internal and peripheral test spaces to be secured in the research reactor are remarkably reduced. In addition, in the secondary stationary driving apparatus, when a plurality of tube lines 12 connected to the driving unit and the hydraulic cylinder assembly 5 are located in the water tank, and maintenance is required, there has been a great deal of difficulty. There has been a problem that an expensive handling tool designed is required.

In order to overcome various problems caused by the conventional structure of the above-mentioned secondary stationary driving device, in the "secondary stationary driving device for the lower part of the research reactor " of Patent Application No. 2014-0059992 (2014.05.19) filed by the present applicant A hydraulic cylinder assembly having a pressure boundary or airtight boundary on the bottom side of the water tank; a piston unit driven by a hydraulic force in the hydraulic cylinder assembly; and a piston unit installed along the inside of the sealing structure penetrating the bottom of the water tank, An extension rod assembly connecting the rods and a buffer cylinder unit having a sealing structure for buffering the shock caused by the fall of the secondary stop rod at the lower end of the hydraulic cylinder assembly are installed in the upper portion of the reactor To the lower portion of the core, and thus, More space can be secured, the margin for core design can be improved, accessibility to the inside and outside of the core can be increased from the upper part of the tank, and maintenance can be facilitated.

Since such a bottom-mounted secondary stationary drive system is located below the water tank and the system is designed with a pressure boundary or airtight boundary, the hydraulic system that provides hydraulic power to the secondary stationary drive system is also installed at the bottom of the water tank, And it is essential that water for generating hydraulic power be drawn from near the upper part of the water tank located in the upper layer and provided to the hydraulic cylinder assembly.

In order to provide hydraulic force to the secondary stationary drive apparatus, the upper water tank is provided with a pressure boundary or airtight boundary, and is provided to the lower hydraulic cylinder assembly, There is an urgent need for a system.

Japanese Patent Application Laid-Open No. 1987-096893 (May 27, 1987) China patent registration 100520982 (2009.07.29)

Sanghaun Kim. et al., "Reactor shutdown mechanism by top-mounted hydraulic system" Transactions of the Korean nuclear society spring meeting May 17-18, 2012

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hydraulic system for a lower installed secondary stationary drive apparatus which is designed to have a pressure boundary or airtight boundary, Installed hydraulics system for driving a bottom-mounted secondary stationary driving device capable of efficiently driving water by maximally circulating the water within the hydraulic system itself installed at the bottom of the water tank by pulling the water tank located at the bottom of the water tank.

In particular, by optimizing the flow of water between the hydraulic cylinder assembly and the hydraulic system connected to the inside of the reactor in the water tank through an aggregation of penetrating, sealing, Installed hydraulics system for driving a bottom-mounted secondary stationary drive device capable of minimizing the circulation flow into the bottom-mounted secondary stationary drive system.

According to an aspect of the present invention, there is provided a lower installation hydraulic system for driving a secondary stationary driving device installed at a lower portion of a research reactor, comprising: a tank installed at a lower portion of a water tank to receive water from the water tank; A pump for sucking and pressurizing the water taken into the tank and supplying the water to the inside of the hydraulic cylinder assembly; And a water intake line connecting the water tank and the tank and supplying the water in the water tank to the tank, wherein a pressure boundary or a leak tight boundary And a plurality of guide rails.

Here, a buffer cylinder unit for buffering a drop impact due to the falling of the secondary stop rod is provided at the lower end of the hydraulic cylinder aggregate, and the buffer cylinder unit may be connected to the pump through a water pressure supply line.

The water intake line may be installed to penetrate the lower wall of the water tank, and may be installed at an outlet plenum inside the reactor, or at a position spaced apart from the bottom of the water tank outside the reactor by a predetermined height.

At this time, a mesh member may be installed at the water inlet at the upper end of the water intake line.

In addition, a seal valve may be installed on the water intake line located below the lower wall of the water tank.

Here, an air discharge line may be branched on the water intake line located below the seal valve, and an air discharge valve may be installed on the air discharge line.

The lower installed hydraulic system according to the present invention comprises: a dump line branched from the hydraulic supply line and connected to the tank; A piston valve installed on the dump line and being opened and closed by receiving pressurized air from a pressurized air supply source; And a solenoid valve for opening and closing the flow of pressurized air provided to the piston valve.

At this time, the piston valve may be connected to the pressurized air supply source through the solenoid valve and pressurized by the pneumatic pressure to be closed or unblocked to be opened.

The lower installed hydraulic system of the present invention comprises: a main valve installed on a hydraulic pressure supply line connecting the pump and the hydraulic cylinder assembly; Further comprising a bypass valve installed on a bypass line connecting the pump and the tank so that the flow pressure supplied to the hydraulic cylinder assembly from the pump is regulated by the main valve and the bypass valve can do.

The tank may be connected to the buffer cylinder unit of the hydraulic cylinder assembly through a buffer line and a buffer control valve may be provided in the buffer line so that the amount of drop impact upon dropping the secondary stop rod can be adjusted.

In addition, the lower installed hydraulic system of the present invention includes: a rising position indicating pressure switch connected to the hydraulic cylinder assembly and indicating that the secondary stopping rod is raised by the hydraulic force to the upper portion of the reactor core; And a lowering position indicating pressure switch connected to the buffer cylinder and indicating that the secondary stopping rod is separated into the core.

At this time, a down pressure switch control valve may be installed on the flow lines before and after the valve provided in the buffer cylinder unit.

In addition, an internal circulation line connecting the tank or the intake line and the hydraulic cylinder aggregate may be further provided so that the hydraulic fluid can be circulated as much as possible in the hydraulic system itself.

According to another aspect of the present invention, there is provided a lower installation hydraulic system for driving a secondary stationary driving device installed at a lower portion of a research reactor, comprising: a water intake line connected to a lower portion of the water tank to receive water from the water tank; A dump line connected to the water intake line side so as to dump the pressurized water in the hydraulic cylinder assembly to the water intake line; A piston valve installed on the dump line and being opened and closed by receiving pressurized air from a pressurized air supply source; A solenoid valve for opening and closing the flow of pressurized air provided to the piston valve; An inner circulation line interconnecting the hydraulic cylinder assembly and the water intake line; A cushioning line connecting the cushioning cylinder unit of the hydraulic cylinder assembly to the water intake line; And a buffer control valve installed in the buffer line and controlling an amount of dropping of the secondary stopper when the secondary stopper is dropped. A pressure boundary or a tight boundary (Leak tightness boundary).

According to the hydraulics system for a bottom-mounted secondary stationary driving apparatus of the present invention, a hydraulic system that provides a hydraulic force to the secondary stationary driving apparatus can be constructed by installing the hydraulic system in a reaction- Therefore, there is no need for additional installation space for hydraulic system installation.

Further, since the hydraulics system for driving the secondary stationary driving device is installed in the reaction control room, even when the research reactor is stopped in an emergency, the operator can easily access the inside of the reaction control room And can be easily maintained including a visual inspection.

Further, since the lower installation hydraulic system is connected to the buffer cylinder unit of the lower installed secondary stop drive device and the control rod drive device through the buffer line and the buffer control valve, the dropping impact amount of each driven structure connected to the drive device can be effectively controlled And it is possible to reduce the burden on the falling impact reduction / reduction design of the driven structure aggregate, thereby improving the design margin of the drive system.

In addition, due to the installation of the lower installed hydraulic system which can drive the lower installed secondary stop drive device which does not interfere with the core design and space, unlike the existing upper stop second stop drive structure, There is an advantage in that the design margin can be increased.

Brief Description of the Drawings Fig. 1 is a block diagram showing a mounting structure of a hydraulics system for driving a secondary stationary driving device and a secondary stationary driving device installed in an upper part of a conventional research reactor.
2 is a sectional view showing the installation of a lower installed hydraulic drive system for driving the lower installed secondary stop drive apparatus and the lower installed secondary stop drive apparatus according to the present invention.
3 is a layout view showing an arrangement of a lower installed hydraulic system for driving a lower installed secondary stop driving apparatus according to the present invention.
4 is a flow diagram showing the flow flow in the lower installed hydro-hydraulic system shown in Fig.

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

FIG. 2 is a cross-sectional view showing the installation of a research reactor subordinate stationary driving apparatus 100 for a research reactor and a lower installed hydraulic system 200 for driving a stationary secondary stationary driving apparatus according to an embodiment of the present invention.

2, the lower stationary stationary drive system 100 of the research reactor includes a secondary stationary rod 110 located near the core 104 of the research reactor 102 and a lower stationary rod 110 And a secondary stop rod 110 and an elongated rod assembly 130 connected to the secondary stop rod 110 by a hydraulic force and disposed under the lower wall 106 of the water tank, The hydraulic pressure required for driving the hydraulic cylinder assembly 150 is supplied through a lower installed hydraulic system 200 located below the lower wall 106 of the water tank. do.

The secondary stopper rod 110 is located in the vicinity of the core 104 of the reactor 102 to perform a secondary stop function of the reactor 102. The secondary stopper rod 110 is connected to the hydraulic system 200 The reactor core 102 is located on the upper side of the core 104 of the research reactor 102 by the hydraulic force provided by the reactor core 102 and falls into the core 104 due to the loss of the hydraulic force during the abnormal operation, do.

In the research reactor 102 shown in FIG. 2, the left side (A) shows a state where the secondary stopper rod 110 is completely inserted into the core 104 when the reactor is stopped, and the right side (B) Shows a state in which the secondary stopper rod 110 is lifted up to the top of the core 104 due to the vertical lift of the secondary stopper rod 110 by hydraulic force when the reactor is in normal operation.

3 is a layout view showing the arrangement structure of the lower installed hydraulic system 200 for driving the lower installed secondary stationary driving apparatus 100, and FIG. 4 is a view showing a flow in the lower installed hydraulic system 200 shown in FIG. Flow diagram showing the flow.

3 and 4, the lower installed hydraulic system 200 for driving the lower installed secondary static driving apparatus according to the present invention is connected to the hydraulic cylinder aggregate 150 of the lower installed secondary static driving apparatus, (Not shown) in the hydraulic cylinder assembly 150 connected to the secondary stopper rod 110 via the first stopper rod 130.

The lower installed hydraulic system 200 of the present invention is located in the reaction control apparatus room R located on the lower side of the water tank 105 as in the case of the hydraulic cylinder assembly 150 and therefore the pressure boundary or leaktight boundary, .

Specifically, the lower installed hydraulic system 200 includes a tank 201 and a water intake line 202 installed in the reaction control apparatus room R so that the water source for driving the system can be drawn from the upper water tank 105 .

The internal circulation port (not shown) formed on the upper side of the hydraulic cylinder assembly 150 and the water intake lines 202 are connected to each other through an internal circulation line (not shown) so that the working fluid can be circulated in the lower installed hydraulic system 200 itself as much as possible. Line 206. < / RTI > At this time, the inner circulation line 206 may be configured to directly connect the hydraulic cylinder assembly 150 with the tank 201 or the intake line 202.

The water intake line 202 is connected between the upper water tank 105 and the lower tank 201 and the water tank water stored in the water tank 105 is supplied into the tank 201 through the water intake line 202 do.

The water intake line 202 is installed through the lower wall 106 of the water tank 105 and is taken out of the outlet plenum of the reactor structure aggregate or at a position spaced a certain height from the bottom of the water tank outside the reactor structure So that it can be withdrawn.

At this time, a separate mesh member is installed at the inlet of the water intake at the upper end of the water intake line 202, so that the fine mesh and suspended matter can be removed by the mesh member when the water intake is taken.

A seal valve 202 is provided on the water intake line 202 close to the lower wall 106 of the water tank 105 so as to selectively block the supply of water to the tank 201 from the water tank 105, ) 203 are provided.

The installation of the seal valve 203 prevents water leakage to the tank 201 from the water tank 105 in an emergency, thereby preventing pipe leakage and breakage.

An air discharge line 205 for discharging the air inside the water intake line 202 is branched on the water intake line 202 located just below the seal valve 203, A valve 204 is provided.

Therefore, if necessary, the air discharge valve 204 can be opened to discharge the air generated in the hydraulic system 200 to the outside.

At this time, when air is to be drawn out through the air discharge valve 204, the seal valve 203 attached to the water intake line 202 is first completely closed, and then the lower installation control rod drive device and the secondary stop drive device When the seal valve 203 of the hydraulic system 200 is fully opened and the pump 210 is rotated for several minutes to several hours with the piston valve 222a of the hydraulic system open, The air is discharged through the open air discharge line 205 to the outside.

On the other hand, a buffer cylinder unit 160 is provided at the lower end of the hydraulic cylinder assembly 150 to buffer the drop impact caused by the falling of the secondary stop rod. The buffer cylinder unit 160 is interconnected with the pump 210 through a water supply line 211.

The pump 210 is connected to the tank 201 through a suction line 212. Accordingly, the water stored in the tank 201 is sucked through the suction line 212 when the pump 210 is driven. The water sucked through the pump 210 is supplied into the buffer cylinder unit 160 of the hydraulic cylinder assembly 150 through the hydraulic pressure supply line 211 to move the piston in the hydraulic cylinder assembly 150 upward The secondary stopper rod is raised by pressurization.

In this process, the flow pressure supplied from the pump 210 to the hydraulic cylinder assembly 150 is regulated by a main valve 220 and a bypass valve 230.

By controlling the flow pressure supplied to the hydraulic cylinder assembly 150 through the main valve 220 and the bypass valve 230, the piston unit connected to the secondary stop rod 110 via the elongated rod assembly can be moved to the predetermined demand time So that it can be lifted sufficiently.

On the other hand, two dump lines 222 and 224 connected to the tank 201 are branched on the hydraulic supply line where the main valve 220 is located. Each of the dump lines 222 and 224 is provided with a combination of two electrically driven solenoid valves 222b and 224b and two air driven piston valves 222a and 224a.

Accordingly, the fluid regulated and pressurized by the main valve 220 and the bypass valve 230 together with the pump 210 flows into the hydraulic cylinder assembly 150 at all times. At this time, the two pairs of the air-driven piston valves (222a) 224a is opened, the pressurized fluid flowing to the hydraulic cylinder assembly 150 is dumped into the tank 201. [

In this state, the fluid pressurized through the pump 210 is discharged into the tank 201, whereby the hydraulic force inside the hydraulic cylinder assembly 150 is lost. And by this hydraulic loss, the secondary stop rod is inserted into the core by gravity.

The fluid in the hydraulic cylinder assembly 150 is discharged through the opened piston valve 222a 224a to the dump line 222 and the damping line 213 while the secondary stop rod is inserted into the core And then flows into the tank 201.

When the opened piston valve 222a 224a is closed, the fluid pressurized through the pump 210 is immediately injected into the hydraulic cylinder assembly 150 to push the piston unit in the hydraulic cylinder assembly 150 upward To provide a force that allows the secondary stop rod to rest against the top of the core.

Here, the pair of air-driven piston valves 222a and 224a are supplied with or shut off the pressurized air through the two electrically operated solenoid valves 222b and 224b.

That is, when the solenoid valve 222b (224b) applies a voltage to the air drive piston valve 222a (224b), the pressurized air is delivered to the solenoid valve 222b (224b) And is operated by the restoring force of the spring due to the pneumatic loss and the flow pressure of the pump.

The tank 201 is connected to the buffer cylinder unit 160 of the lower installation control rod drive unit (not shown) and the buffer cylinder unit 160 of the secondary stop drive unit through the respective tube lines and is connected to the control rod (not shown) The drop amount of the driving device can be freely adjusted by controlling the amount of flow to the tank 201 through the damping line 213 connected to the damping cylinder unit 160 and the damping control valve 235 when the stop rod 110 falls .

In this embodiment, the tank 201 is connected to the lower side of the water intake line 202. However, in view of the fact that the flow rate of the working fluid for driving the secondary stationary driving device is not much required, 201 and the piping of the suction line 212, the dampening line 213, the dump lines 222 and 224 and the descending position indicating flow line 263 of the pump 201 described above to the withdrawal line 202 It is also possible to configure them directly.

The UP position indicating pressure switch 250 is connected to a port formed on the outer surface of the hydraulic cylinder assembly 150 located at a level immediately below the piston in the raised state, The second stop rod 110 detects that the pressure is higher than a predetermined level and indicates that the second stop rod 110 is raised to the upper portion of the core.

Further, the DOWN position indicating pressure switch 260 is connected to one of the two ports formed at a level equal to or greater than the cushioning stroke below the inflow port of the cushioning cylinder unit 160 hermetically connected to the lower portion of the hydraulic cylinder assembly 150 When the secondary stopper rod 110 is in a state of being distanced into the core, the flow of the flow is blocked by the valve 161 located in the buffer cylinder unit 160 to transfer the flow pressure in the dump state to the corresponding pressure switch line, It indicates that it is fully inserted into the core.

On the flow lines 263 before and after the valve 161 for the lowering position indicating pressure switch 260, the lowering position indicating pressure switch 262 so as to sense a pressure equal to or higher than a predetermined pressure for the operation of the first and second valves 260, 260, respectively.

In this case, the UP / DOWN position indicating pressure switches 250 and 260, which respectively indicate the rising and falling of the secondary stopper rod 110, are set to the operating pressure range of the hydraulic cylinder aggregate 150 It can be designed to be sufficiently included.

In addition, since the lower installed hydraulic system 200 is located at the lower part of the water tank 105, the hydrostatic pressure is designed to be structurally and safely drivable without leakage in the operating pressure range to which the hydrostatic pressure is added. At this time, various instruments, valves, pumps 210, and filters 216 provided in the hydraulic system 200 can also be selected as devices that can be safely operated within the operating pressure range without leakage.

As described above, the hydraulic system 200 for providing the hydraulic power to the lower installed secondary stationary driving device 100 is constructed by being installed in the responsiveness control room R in the lower part of the water tank where the lower installed control rod driving device is installed, There is no need for a separate additional installation space.

Particularly, in the lower installed hydraulic system, the tube 213 is disposed between the reaction control tank 201 for taking the water tank 105 and the buffer cylinder unit 160 of the lower installed control rod driving device and the lower installed secondary static driving device. And the control valve 235 to constitute the fluid pressure damping system, it is possible to effectively control the amount of drop impact of each of the assemblies to be connected connected to the drive unit, / Reduce the burden on the reduction design, it is possible to improve the design margin for the driving device. In addition, circulation flow between the water tank 105 and the hydraulic system 200 can be performed to maintain water tank equilibrium.

In addition, even when the reactor 102 for research in an emergency stops, the operator can easily access the inside of the reaction control apparatus room R to easily check whether the apparatus is operated or not, and maintenance including visual inspection can be easily performed There is an advantage to be able to do.

In addition, unlike the conventional structure of the overhead installed secondary stationary drive system 10, installation of the lower installed hydraulic system 200 capable of driving a very small lower installed stationary drive system 100 without core design and interference with space Thereby further increasing the design margin of the device according to the device itself and core requirements.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be possible to change it.

100: Lower installation secondary stop drive device 102: Research reactor
104: core 105: water tank (or water tank)
106: (tank) bottom wall 110: secondary stop rod
130: extension rod assembly 150: hydraulic cylinder assembly
160: buffer cylinder unit 161: valve
180, 203: Seal valve 200: Hydraulic system
201: tank for reactivity control device 202: intake line
204: Air exhaust valve 205: Air exhaust line
206: internal circulation line 210: pump
211: Hydraulic pressure supply line 212: Suction line
213: buffer line 216: filter
220: Main valve 222, 224: Dump line
222a, 224a: piston valve 222b, 224b: solenoid valve
230: bypass valve 235: buffer control valve
240: pressurized air supply source 250: raised position indicating pressure switch
260: descending position indicating pressure switch 262, 264: descending pressure switch control valve
263: descending position indicating flow line

Claims (14)

A tank 201 installed at a lower portion of the water tank 105 to receive water from the water tank 105;
A pump 210 for sucking and pressurizing the water taken into the tank 201 and supplying the water to the hydraulic cylinder assembly 150;
And a water intake line (202) connecting the water tank (105) and the tank (201) and supplying water of the water tank (105) to the tank (201)
The water intake line 202 is installed through the lower wall 106 of the water tank 105 and is connected to an outlet plenum inside the reactor or to a water level at a predetermined height from the bottom of the water tank 105 outside the reactor. And the lower installation hydraulic system for driving the second stationary drive unit installed under the reactor for research.
The cushioning cylinder unit according to claim 1, wherein a cushioning cylinder unit is installed at a lower end of the hydraulic cylinder assembly and the cushioning cylinder unit is connected to the pump through a water pressure supply line And a lower installation hydraulics system for driving a secondary stationary drive device installed under a research reactor.
delete The hydraulic system as set forth in claim 1, wherein a mesh member is installed at a water intake at an upper end of the water intake line (202).
2. The reactor as set forth in claim 1, wherein a seal valve (203) is installed on the water intake line (202) located below the lower wall (106) of the water tank (105) Lower installed hydraulic system for driving the device.
The air conditioner according to claim 5, wherein an air discharge line (205) is branched on the water intake line (202) located below the seal valve (203), and an air discharge valve And a lower installation hydraulics system for driving a secondary stationary drive device installed under a research reactor.
3. The method of claim 2,
A dump line (222) (224) branched from the hydraulic pressure supply line (211) and connected to the tank (201);
A piston valve (222a, 224a) installed on the dump line (222) (224) and opened and closed by receiving pressurized air from a pressurized air supply source (240);
Solenoid valves 222b and 224b for opening and closing the flow of pressurized air provided to the piston valves 222a and 224a;
Further comprising: a lower installation hydraulics system for driving a second stationary drive unit installed at a lower portion of the research reactor.
The air conditioner of claim 7, wherein the piston valve (222a) (224a) is connected to the pressurized air supply source (240) through two solenoid valves (222b, 224b) Wherein the lower portion of the lower portion of the reactor is connected to the lower portion of the reactor.
3. The apparatus according to claim 2, further comprising: a main valve (220) installed on a hydraulic pressure supply line (211) connecting the pump (210) and the hydraulic cylinder assembly (150);
And a bypass valve 230 installed on a bypass line connecting the pump 210 and the tank 201,
Wherein a flow pressure supplied to the hydraulic cylinder assembly (150) from the pump (210) is regulated by the main valve (220) and the bypass valve (230) Install hydraulic system.
3. The apparatus according to claim 2, wherein the tank (201) is connected to the buffer cylinder unit (160) of the hydraulic cylinder assembly (150) through a buffer line (213) And a lower installation hydraulic system for driving a second stationary drive unit installed under the reactor for research.
3. The method of claim 2,
A rising position indicating pressure switch 250 connected to the hydraulic cylinder assembly 150 for indicating that the secondary stopping rod 110 is raised by the hydraulic force to the upper portion of the reactor core;
A descending position indicating pressure switch 260 connected to the buffer cylinder unit 160 to indicate that the secondary stopping rod is in a state of being dropped into the core;
Further comprising: a lower installation hydraulics system for driving a second stationary drive unit installed at a lower portion of the research reactor.
12. The method according to claim 11, wherein a downward pressure switch control valve (262) (264) is installed on the upstream and downstream flow lines (263) with respect to the valve (161) provided in the buffer cylinder unit Lower installation hydraulics system for driving the secondary stationary drive unit under the reactor.
2. The research reactor according to claim 1, further comprising an internal circulation line (206) connecting the tank (201) or the water intake line (202) and the hydraulic cylinder aggregate (150) Lower installation hydraulic system for driving drive.
A water intake line (202) connected to a lower portion of the water tank (105) and taking water of the water tank (105);
A dump line (222) (224) connected to the water intake line (202) side so as to dump the pressurized water in the hydraulic cylinder assembly (150) to the water intake line (202);
A piston valve (222a, 224a) installed on the dump line (222) (224) and opened and closed by receiving pressurized air from a pressurized air supply source (240);
Solenoid valves 222b and 224b for opening and closing the flow of pressurized air provided to the piston valves 222a and 224a;
An internal circulation line 206 interconnecting the hydraulic cylinder assembly 150 and the water intake line 202;
A buffer line 213 connecting the buffer cylinder unit 160 of the hydraulic cylinder assembly 150 to the water intake line 202;
And a buffer control valve (235) installed in the buffer line (213) to adjust an amount of dropping impact upon falling of the secondary stopper rod,
Wherein the reactor is installed with a pressure boundary or a leak tight boundary in a reaction control room R located at a lower portion of the water tank 105. [ Install hydraulic system.

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