KR101463441B1 - High concentration boron injection system and safety injection system having the same - Google Patents

Abstract

The present invention proposes a highly concentrated boric acid injection system capable of rapidly injecting highly concentrated boric acid water into a reactor vessel at the beginning of an accident such as a coolant loss accident or a non-coolant loss accident. The high-concentration boric acid injection system includes a boric acid tank formed to receive boric acid water to be injected into a reactor vessel in the event of a coolant loss accident or a non-coolant loss accident, and a boron- And a safety infusion pipe connected to a lower portion of the boric acid tank for maintaining a flow path of the cooling water to be injected, wherein the boric acid tank maintains thermal equilibrium with the reactor vessel so that the concentration of the boric acid water At least a portion of the upper portion of the upper portion of the reactor vessel is opened so as to inject boric acid water into the reactor vessel prior to the cooling water flowing into the tank via the safety injection pipe.

Description

TECHNICAL FIELD [0001] The present invention relates to a high-concentration boric acid injection system and a safety injection system including the same. BACKGROUND OF THE INVENTION [0002]

The present invention relates to a highly concentrated boric acid injection system capable of promptly injecting highly concentrated boric acid water into a reactor for inhibiting reactivity and stopping the core, and a safety injection system having the same.

Nuclear reactors can be classified according to the configuration of the safety system or the installation location of the main equipment. First, depending on how the safety system is constructed, it can be divided into an active reactor using an active power such as a pump, and a passive reactor using an attractive force such as gravity or gas pressure. Depending on the installation location of the main equipment, separate type reactors (eg domestic commercial reactors) where the main equipment (steam generator, pressurizer, pump impeller, etc.) are installed outside the reactor, and integral reactors in which the main equipment is installed inside the reactor vessel SMART reactor).

In nuclear power plants (nuclear power plants), various types of systems are used to supply emergency cooling water (boric acid water) as a reactor in case of an accident. For example, there is a nitrogen pressurized safety injection tank (or an accumulator) for supplying emergency cooling water (boric acid water) to a reactor in case of a large loss of coolant in which a large amount of cooling water is discharged in a commercial separated water- A low-pressure safety infusion pump and a high-pressure safety infusion pump are used. For example, in the passive separation type pressurized water reactors AP600 and AP1000 developed by Westinghouse USA, the pressure between the reactor and the tank is balanced at the high pressure condition in addition to the nitrogen pressurized safety injection tank, (Core Makeup Tank (CMT)) is used to inject boron (boric acid) water into the reactor, and a reload tank in the containment building is injected by gravity after the reactor is decompressed.

Integrated reactors do not have large piping to connect major equipment, and small piping such as chemical and volume control systems, safety injection systems, static cooling systems, safety valves, etc. are connected to the reactor vessel. Because of these characteristics, large-scale coolant loss incidents that damage large pipes in integral reactors do not occur in principle, and large amounts of cooling water exist in the internal space of reactors because main equipment is accommodated inside the reactors of integral reactors. Therefore, when a coolant loss accident (piping damage, etc.) occurs in an integrated reactor, the pressure and the water level of the reactor are comparatively and slowly reduced compared to the separable reactor. In addition, there is a lot of available space that can be used for other purposes inside the integrated reactor.

Generally, in the early stage of a non-coolant loss accident such as a steam pipe breakage accident, the reactor coolant temperature rapidly decreases and the density of cooling water used as a neutron moderator increases. Therefore, the amount of moderator per unit volume is relatively increased, Is increased. When this happens, the active reactor (domestic commercial) operates a high-pressure safety injection system using a high-pressure pump to rapidly inject boric acid water into the core. In a passive reactor (AP1000: Westinghouse, USA), boron is injected at high pressure using a gravity replenishment tank. The core replenishment tank is also used for the loss of coolant, but it is mainly used to suppress the reactivity of reactor core in case of loss of non - coolant.

In the case of a loss of coolant, in addition to the high-pressure system, a safety injection tank using gas pressure is used for injecting boric acid water at a medium pressure. In the case of a storage tank (AP1000: USA Westinghouse) Alternatively, a low-pressure safety infusion pump (for domestic use) may be used together to pump boric acid at low pressure by a pump.
Other techniques for the background of the invention refer to the following prior art documents.
1. Registration Patent Publication No. 10-0402705 (Oct. 30, 2003)
2. Japanese Unexamined Patent Application Publication No. 05-297168 (November 12, 1993)

It is an object of the present invention to propose a highly concentrated boric acid injection system capable of rapidly injecting highly concentrated boric acid water into a reactor vessel for restricting reactivity in a reactor capable of utilizing internal space of a reactor vessel to stop the reactor core.

It is another object of the present invention to solve the problem of increasing the size of the tank due to the use of boric acid water which is relatively low in concentration and the problem of lowering the boric acid injection performance by using low concentration boric acid water, And a high-concentration boric acid injection system that solves the problem of increased production cost due to a large-capacity design, and a safety injection system including the same.

In order to accomplish the object of the present invention, a highly concentrated boric acid injection system according to an embodiment of the present invention includes a boric acid tank configured to receive boric acid water to be injected into a reactor vessel when a coolant loss accident or a non-coolant loss accident occurs, And a safety infusion pipe connected to a lower portion of the boric acid tank to provide a flow path of the cooling water injected into the reactor vessel through the boric acid tank from a safety injection facility installed outside the reactor vessel, The boric acid tank is provided inside the reactor vessel so as to maintain a state of thermal equilibrium with the reactor vessel so as to maintain the concentration of the boric acid water therein and prior to the cooling water flowing into the tank through the safety injection pipe, At least a portion of the upper portion is opened.

According to an embodiment of the present invention, the boric acid tank is installed in a space between the reactor vessel and the internal structure so as to be installed in a usable space inside the reactor vessel.

According to another embodiment of the present invention, the boric acid tank is formed in an annular shape so as to be installed inside the reactor vessel.

At least a part of the annular shape may be divided into a plurality of the boric acid tanks so that the boric acid tanks can be installed and repaired independently of each other.

According to another embodiment of the present invention, the highly concentrated boric acid injection system is installed in the safety injection pipe to prevent the cooling water from being injected from the safety injection facility during normal operation of the reactor, And a check valve which is opened by a check valve.

According to another embodiment of the present invention, a highly concentrated boric acid injection system is provided on the upper part of the boric acid tank to provide a flow path of boric acid water or cooling water injected from the boric acid tank into the reactor vessel, And an injection piping formed therein.

According to another embodiment of the present invention, the safety injection facility is an active safety injection facility operated by a passive safety injection facility which is actively driven by natural forces or by an energy externally applied.

In order to realize the above-mentioned object, the present invention also discloses a safety injection system. The safety injection system includes a safety injection system installed outside the reactor vessel to limit the level of the reactor vessel when a coolant loss accident or a non-coolant loss accident occurs, and injecting cooling water into the reactor vessel, Wherein the high concentration boric acid injection facility is configured to inject boric acid water to be injected into the reactor vessel when a coolant loss accident or a non-coolant loss accident occurs, And a safety infusion line connected to the lower portion of the boric acid tank to provide a flow path of cooling water injected into the reactor vessel through the boric acid tank from the safety infusion system And the boric acid tank is connected to the reactor vessel At least a part of the upper portion of the reactor vessel is provided inside the reactor vessel so as to maintain the concentrated state of the boron-containing water to be injected into the reactor vessel prior to the cooling water flowing into the tank through the safety injection pipe It is open.

According to the present invention having such a constitution as described above, the boric acid concentration of the boric acid stored in the boric acid tank can be maintained at a level higher than room temperature without any additional heater, so that it can be designed with a small capacity.

In addition, the present invention can design a highly-concentrated boric acid injection system at a lower design pressure than the case where it is installed outside the reactor vessel by installing a highly concentrated boric acid injection system inside the reactor vessel.

In addition, the present invention can increase the amount of boric acid to be injected because the concentration of boric acid is high, even when highly concentrated boric acid can be injected prior to the operation of other safety injection facilities except for the high concentration boric acid injection facility. .

In addition, the present invention is designed to inject boric acid water prior to the operation of other safety injection facilities without separately providing an isolation valve or a piping system for the boric acid injection system of high concentration by the safety system activation signal, Configuration and operation can be simplified.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual diagram showing a highly concentrated boric acid injection facility and a reactor including the same according to an embodiment of the present invention; FIG.
FIG. 2 is a conceptual diagram showing a system arrangement of a highly concentrated boric acid injection facility during normal operation of the reactor shown in FIG. 1;
3 is a conceptual diagram showing initiation of boric acid injection of a highly concentrated boric acid injection plant by operation of a core replenishing tank when an accident occurs in the reactor shown in FIG.
FIG. 4 is a conceptual diagram showing the continuous state of boric acid injection of the highly concentrated boric acid injection equipment by operation of the core replenishment tank, following FIG. 3; FIG.
FIG. 5 is a conceptual diagram showing the completion of the injection of boric acid in the highly concentrated boric acid injection plant and the safe injection state of the cooling water supplied from the core replenishment tank, as shown in FIG.
FIG. 6 is a conceptual diagram showing the safety injection state of the cooling water supplied from the safety injection tank after the operation of the core filler tank is terminated after FIG. 5 in the case of a coolant loss accident.
Figure 7 is a top view of the boric acid tank and safety injection piping shown in Figure 1;
8 is a plan view showing a modification of the boric acid tank.
9 is a plan view showing still another modification of the boric acid tank.
FIG. 10 is a conceptual view showing a highly concentrated boric acid injection facility and a reactor including the same according to another embodiment of the present invention. FIG.

Hereinafter, a highly concentrated boric acid injection system and a safety injection system including the same will be described in detail with reference to the drawings. In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

1 is a conceptual diagram showing a highly concentrated boric acid injection facility 100 and a reactor 10 having the same according to an embodiment of the present invention.

The concentrated boric acid injection plant 100 may be operated in the boric acid tank 11 prior to the injection of the cooling water stored in the safety injection facility 15 in the event of an accident such as a loss of coolant or a loss of non- 110 is filled with high-concentration boric acid water. The boric acid water and the cooling water may be the same safety injection number, but the boric acid water remains relatively highly concentrated as compared with the cooling water until injected into the reactor vessel 11 at least. The highly concentrated boric acid injection equipment 100 includes a boric acid tank 110 installed inside the reactor vessel 11 and a safety injection pipe 120 connecting the reactor vessel 11 with the safety injection facility 15 outside the reactor vessel 11 ).

The boric acid tank 110 is formed to receive the boric acid water to be injected into the reactor vessel 11 in the event of a coolant loss accident or a non-coolant loss accident in the reactor 10. [ The boric acid tank 110 is installed inside the reactor vessel 11 to maintain the concentration of boric acid in the concentrated state.

The boric acid water stored in the boric acid tank 110 is used to suppress the nuclear fission reactivity of the core 12. The boric acid water that can be dissolved in the cooling water at a normal operating temperature of a relatively high temperature reactor Is increased to about 5 times.

Therefore, the boric acid tank 110 can maintain a thermal equilibrium state with the reactor vessel 11 when it is installed inside the reactor vessel 11 to receive heat generated from the reactor core 12. Accordingly, the boric acid stored in the boric acid tank 110 can be maintained in a highly concentrated state.

The integrated reactor 10 as shown in the figure has an internal space that can be utilized for various purposes because the internal space of the reactor vessel 11 is relatively large. The boric acid tank 110 is installed in a space between the reactor vessel 11 and the internal structure, which is an available space inside the reactor vessel 11. For example, the boric acid tank 110 may be installed in an annular space above the steam generator 13, which is a pump discharge portion between the reactor vessel 11 and the internal structure. Further, it can be installed in the side space of the steam generator 13. 1 shows that a boric acid tank 110 is installed in an annular space above the steam generator 13.

However, since the present invention can be utilized in other reactors capable of utilizing the internal space of the reactor, its purpose is not limited to the integral reactor.

The safety infusion piping 120 is provided with a safety infusion piping 120 for supplying at least one safety infusion pipeline to the reactor vessel 11 to provide a flow path of cooling water injected into the reactor vessel 11 through the boric acid tank 110 from the safety infusion installation 15, And is connected to the lower part of the facility 15 and the boric acid tank 110.

There are various ways in which the safety injection pipe 120 is connected to the lower portion of the boric acid tank 110. [ A connection pipe (not shown) may be separately installed between the lower part of the boric acid tank 110 and the reactor vessel 11, and the safety injection pipe 120 may be connected to the connection pipe through a flange. Alternatively, the safety infusion piping 120 may be connected directly to the boric acid tank 110 through the reactor vessel 11.

The cooling water is injected into the reactor vessel 11 from the safety injection facility 15 provided outside the reactor vessel 11 when an accident occurs in the reactor 10. [ The safety injection facility 15 is for restricting the lowering of the level of the cooling water in the reactor vessel 11. When the cooling water is injected into the reactor vessel 11 from the safety injection facility 15 in the event of an accident, Can be maintained at a certain level or more.

The safety injection facility 15 may be a passive safety injection facility which is actively driven by natural forces such as a pressure difference or gravity head, or may be an active safety injection facility operated by energy externally applied. The illustrated safety infusion installation 15 is a passive safety infusion installation comprising a core replenishment tank 15a of a passive reactor AP1000 (Westinghouse, USA) and a pressurized safety infusion tank 15b of a pressurized or commercial reactor.

Check valves 15a 'and 15b' or isolation valves 15a 'are installed in the safety infusion piping 120. The safety infusion piping 120 connected to the core replenishing tank 15a of the safety infusion set 15 is provided with a check The valve 15a 'and the isolation valve 15a' are all installed and the safety injection pipe 120 connected to the safety injection tank 15b is provided with the check valve 15b '. The check valves 15a 'and 15b' prevent the cooling water from being injected from the safety injection equipment 15 such as the core filler tank 15a or the safety injection tank 15b during normal operation of the reactor, Is opened by the flow of fluid to be injected into the reactor vessel (11) from the safety injection facility (15) through the boric acid tank (110).

When the flow of cooling water is formed from the core replenishing tank 15a or the safety injection tank 15b toward the reactor vessel 11, the cooling water flows into the lower portion of the boric acid tank 110 through the safety injection pipe 120. The boric acid tank 110 is connected to the upper portion of the reactor vessel 11 to inject the boric acid water pushed up by the incoming cooling water into the reactor vessel 11 in advance of the cooling water flowing into the lower portion of the boric acid tank 110 through the safety injection pipe 120. [ At least a part of which is open.

Accordingly, when cooling water flows into the boric acid tank 110 from the safety injection facility 15 in the event of an accident such as a loss of a coolant or a loss of non-coolant, the boric acid water in the boric acid tank 110 flows into the reactor vessel 11 before the cooling water, Lt; / RTI > The cooling water introduced into the reactor vessel 11 from the safety injection facility 15 is injected into the reactor vessel 11 only after the highly concentrated boric acid water of the boric acid tank 110 is injected into the reactor vessel 11.

Since the highly concentrated boric acid water stored in the boric acid tank 110 is injected into the reactor vessel 11 prior to the cooling water supplied from the safety injection equipment 15, the injection performance of the boric acid water injected into the reactor vessel 11 . This is because the boric acid concentration is higher than in the case where the boric acid tank 110 is installed outside the reactor vessel 11 even when the same amount of boric acid water is injected, so that the amount of boric acid injected into the reactor vessel 11 is greatly increased. In addition, since highly concentrated boron-rich water can be injected prior to the cooling water supplied from the safety injection equipment 15, the reactivity of the core 12 can be reduced early.

The injection piping 130 is formed on the upper portion of the boric acid tank 110 and communicates with the inside of the reactor vessel 11 to provide a flow path of boric acid water or cooling water injected from the boric acid tank 110 into the reactor vessel 11 . The boric acid tank 110 communicates with the inside of the reactor vessel 11 through the injection pipe 130.

There is no possibility that the cooling water filled in the reactor vessel 11 and the boric acid water in the boric acid tank 110 communicate with each other at the time of normal operation of the reactor because the boric acid tank 110 is open. The lower part of the boric acid tank 110 is isolated until the cooling water is injected from the safety injection equipment 15 and the boric acid tank 110 maintains a thermal equilibrium state with the reactor vessel 11, The inside water of the reactor and the cooling water filled in the reactor vessel 11 do not communicate smoothly.

Since the boric acid water in the boric acid tank 110 is injected into the reactor vessel 11 through the injection pipe 130 due to the rise in the water level and the injection pipe 130 is installed on the top of the boric acid tank 110, The hot borated water of the boric acid tank 110 can be injected into the reactor vessel 11 prior to the low temperature cooling water injected from the safety injection facility 15. [ On the other hand, when the injection pipe 130 is installed in the boric acid tank 110, the opportunity for communication between the boric acid water in the boric acid tank 110 and the cooling water filled in the reactor vessel 11 can be reduced. Accordingly, the boric acid water stored in the inside of the boric acid tank 110 can be maintained in a highly concentrated state.

The highly concentrated boric acid injection system 100 may further include an auxiliary system (not shown) for controlling the boric acid water inside the boric acid tank 110 during normal operation of the reactor 10. [ However, since the highly concentrated boric acid injection system 100 operates in conjunction with the operation of the safety injection system 15, a separate drive system for operating the boric acid tank 110 in case of an accident such as an isolation valve operated by a safety system operation signal It is not installed.

The design pressure of the boric acid tank 110 can be designed so as to withstand the pressure difference generated inside the reactor vessel 11 because the boric acid tank 110 is installed inside the reactor vessel 11. [ Accordingly, the design pressure is greatly reduced compared to the pressure difference (atmospheric pressure-operation pressure) generated when the boric acid tank 110 is installed outside the reactor vessel 11.

FIG. 2 is a conceptual diagram showing the systematic arrangement of the highly concentrated boric acid injection equipment 100 during the normal operation of the reactor shown in FIG.

During normal operation of the reactor 10, the cooling water is circulated inside the reactor vessel 11 by operation of the reactor coolant system, and the water level of the reactor vessel 110 is maintained at a constant level by the chemical and volumetric control system (not shown) ) And the like for normal operation. Accordingly, the check valves 15a 'and 15b' and the isolation valve 15a 'provided in the safety injection pipe 120 are all kept closed, and during the normal operation of the reactor 10, the highly concentrated boric acid injection equipment 100 It does not work.

Since the check valves 15a 'and 15b' are kept closed by the pressure of the reactor vessel 11 during the normal operation of the reactor 10, even if the reactor vessel 11 is relatively higher in pressure than the outside, 11 can be prevented from flowing back to the safety injection equipment (15).

Hereinafter, the operation of the highly concentrated boric acid injection system 100 will be described with reference to FIGS. 3 to 6 in the event of a reactor coolant accident or a non-coolant loss accident.

 FIG. 3 is a conceptual diagram showing the start of boric acid injection of the highly concentrated boric acid injection facility 100 by operation of the core replenishing tank 15a when an accident occurs in the reactor shown in FIG.

The isolation valve 15a "provided in the safety injection pipe 120 connected to the core replenishing tank 15a is opened by an associated signal and the flow of the cooling water formed from the core replenishing tank 15a causes the check valve 15a ' Temperature cooling water flows into the lower portion of the boric acid tank 110 from the core replenishing tank 15a so that the water level of the high temperature highly concentrated boric acid water in the boric acid tank 110 gradually increases and the boric acid water is injected into the upper portion of the boric acid tank 110 And starts to be injected into the reactor vessel 11 through the pipe 130.

FIG. 4 is a conceptual diagram showing the boron-dissolved water injection state of the highly concentrated boric acid injection equipment 100 by operation of the core replenishment tank 15a.

The coolant level in the reactor vessel 11 is continuously lowered as the coolant density is increased due to release of the coolant to the breakage portion as the coolant loss accident proceeds or after cooling after the loss of the non-coolant loss.

The cooling water continuously flows into the boric acid tank 110 from the core replenishing tank 15a and the water level of the cooling water gradually increases inside the boric acid tank 110. [ Thus, highly concentrated boric acid water is continuously injected into the reactor vessel 11 from the boric acid tank 110.

FIG. 5 is a conceptual diagram showing the end of the boron-containing water injection of the high-concentration boric acid injection equipment 100 and the safe injection state of the cooling water supplied from the core replenishment tank 15a.

As the cooling water continuously flows from the core replenishing tank 15a, the boric acid water stored in the boric acid tank 110 is completely injected into the reactor vessel 11. The size of the boric acid tank 110 can be designed based on the amount of boric acid required depending on the accidental nature of the reactor 10 and thus can be injected into the reactor vessel 11 by the amount of highly concentrated boric acid water required early in the accident . Subsequently, the cooling water introduced from the core replenishment tank 15a is injected into the reactor vessel 11.

Both the boric acid water and the cooling water are injected into the reactor vessel 11 from the boric acid tank 110 and the injection of the boric acid water continues to be pushed up by the cooling water so that the injection of the boric acid water and the cooling water is continuous.

In the case of a non-coolant loss event in which pipe breakage does not occur, the cooling rate of the residual heat removal system gradually decreases, reaching a steady state similar to the steady state.

Fig. 6 is a conceptual diagram showing the safety injection state of the cooling water supplied from the safety injection tank 15b after the operation of the core replenishing tank 15a is terminated, as shown in Fig. 5, in the event of a coolant loss accident.

The cooling water stored in the core replenishing tank 15a is depleted and the operation of the core replenishing tank 15a is terminated but at least a part of the cooling water flowing from the core replenishing tank 15a into the boric acid tank 110 still remains in the form of boric acid And remains in the tank 110. The remaining cooling water is pushed up inside the boric acid tank 110 by the cooling water supplied from the safety injection tank 15b and injected into the reactor vessel 11.

In case of a coolant loss accident, safety injection from the core replenishment tank 15a is terminated and cooling water is continuously supplied from the safety injection tank 15b. The injection of the cooling water supplied from the core replenishing tank 15a to the boric acid tank 110 and the cooling water supplied from the safety injection tank 15b to the boric acid tank 110 are also continuous.

The highly concentrated boric acid injection equipment 100 injects the highly concentrated boric acid water stored in the boric acid tank 110 into the reactor vessel 11 in the early stage and then injects the cooling water supplied from the safety injection equipment 15, And the safety level of the reactor 10 can be secured by keeping the level of the cooling water in the reactor vessel 11 at a predetermined level or higher.

7 is a top view of the boric acid tank 110 and the safety injection piping 120 shown in FIG.

In the integrated reactor, there is an available space inside the reactor vessel 11, and the boric acid tank 110 can be formed in an annular shape so as to be installed in a space available inside the reactor vessel.

A plurality of safety infusion piping 120 may be arranged to be connected to various safety infusion facilities 15 (see FIG. 1), and the infusion piping 130 may be divided into a plurality of Can be installed.

8 is a plan view showing a modified example of the boric acid tank 210. Fig.

The boric acid tank 210 may be divided into at least a part of the annular shape so that the boric acid tank 210 can be independently installed and repaired. Accordingly, when any one of the boric acid tanks 210 needs to be repaired, it is possible to perform the repair work independently of the other boric acid tanks 210. When it is necessary to install another facility in a part of the annular available space, Some of the boric acid tank 210 may be separated to provide an available space for other facilities.

9 is a plan view showing still another modification of the boric acid tank 310. As shown in Fig.

The shape of the boric acid tank 310 may vary depending on the available space inside the reactor vessel. The boric acid tank 310 may be formed into a cylindrical shape as shown in the figure. Further, an additional apparatus may be installed in a space formed between any one of the boric acid tanks 310 and the other.

10 is a conceptual diagram showing a highly concentrated boric acid injection facility 400 and a reactor 40 having the same according to another embodiment of the present invention.

The safety infusion set-up 45 may include an active safety infusion set-up, which is operated by an externally applied energy, as well as a passive safety infusion set-up. An example of an active safety infusion set may be a safety infusion set-up operated by a safety infusion pump 47 as shown.

The highly concentrated boric acid injection system of the present invention can rapidly inject highly concentrated boric acid water into the reactor vessel at the early stage of an accident such as a loss of coolant or a loss of non-coolant, thereby contributing to the safety improvement of the reactor.

In addition, the highly concentrated boric acid injection system of the present invention is one of the passive safety injection systems, and it is easy to construct a passive type safety system together with a passive safety system such as a passive residual heat removal system. The passive safety system consists of facilities that do not require an AC power source such as an emergency diesel generator, which eliminates the need for operator intervention for a long period of time, thereby improving the reliability of the system and contributing to the safety improvement of the reactor.

In addition, the boric acid tank can be designed and manufactured with relatively small / low pressure (low pressure equipment with a small differential pressure). The high-concentration boric acid injection facility can reduce the size of high-pressure tanks such as core replenishment tanks, reduce the size of high-pressure tanks such as core replenishment tanks, and improve the economic efficiency.

The high-concentration safety injection system and the safety injection system including the high-concentration safety injection system described above are not limited to the configurations and the methods of the embodiments described above, but the embodiments may be modified so that all or some of the embodiments are selectively As shown in FIG.

10: Reactor 100: Highly Concentrated Boric Acid Injection System
110: Boric acid tank 120: Safety injection piping
130: injection piping

Claims (8)

A boric acid tank formed to receive boric acid water to be injected into the reactor vessel in the event of a coolant loss accident or a non-coolant loss event; And
And a safety infusion pipe connected to a lower portion of the boric acid tank to provide a flow path of cooling water injected into the reactor vessel through the boric acid tank from a safety injection facility installed outside the reactor vessel,
In the boric acid tank,
The reactor vessel is maintained in a state of thermal equilibrium with the reactor vessel so as to maintain the concentration of the boron-containing water, and boron water is first injected into the reactor vessel in advance of the cooling water flowing into the tank through the safety injection pipe Wherein at least a portion of the upper portion is opened. The method according to claim 1,
Wherein the boric acid tank is installed in a space between the reactor vessel and the internal structure so as to be installed in a usable space inside the reactor vessel. The method according to claim 1,
Wherein the boric acid tank is formed in an annular shape so as to be installed inside the reactor vessel. The method of claim 3,
Wherein the boric acid tank is divided into at least a part of the annular shape so that the boric acid tank can be independently installed and repaired. The method according to claim 1,
Further comprising a check valve installed in the safety injection pipe to prevent cooling water from being injected from the safety injection facility during normal operation of the reactor and opened by a flow of fluid formed from the safety injection facility. Infusion equipment. The method according to claim 1,
Further comprising an injection pipe installed at an upper portion of the boric acid tank to communicate with the inside of the reactor vessel to provide a flow path of boric acid water or cooling water injected from the boric acid tank into the reactor vessel, . The method according to claim 1,
Wherein the safety injection facility is an active safety injection facility operated by a passive safety injection facility which is actively driven by natural force or by an energy externally applied. A safety injection system installed outside the reactor vessel for injecting cooling water into the reactor vessel to limit the level of the reactor vessel when a coolant loss accident or a loss of non-coolant accident occurs; And
And a highly concentrated boric acid injection facility configured to inject boric acid water in a concentration state prior to the cooling water injection of the safety injection facility into the reactor vessel,
The high-concentration boric acid injection equipment comprises:
A boric acid tank formed to receive boric acid water to be injected into the reactor vessel when a coolant loss accident or a non-coolant loss accident occurs; And
At least one safety infusion facility and a safety infusion line connected to a lower portion of the boric acid tank to provide a flow path of cooling water injected from the safety infusion facility through the boric acid tank to the reactor vessel,
In the boric acid tank,
Wherein the reactor vessel is installed inside the reactor vessel so as to maintain the concentrated state of the boron-containing water by maintaining a thermal equilibrium state with the reactor vessel, and the boron-containing water is injected first into the reactor vessel prior to the cooling water flowing into the tank through the safety injection- Wherein at least a portion of the upper portion is open.

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