CN212411590U - A system for reactor power control - Google Patents

Abstract

The utility model discloses a system for controlling power of a reactor, which comprises a control rod module (1) and a fluid supply module (2); wherein, one reactor comprises a plurality of control rod modules (1), the plurality of control rod modules (1) The rod modules (1) share a set of fluid supply modules (2). The utility model changes the original adjustment of the slender rod-shaped solid control rod to the adjustment of the liquid, and the adjustment is more accurate; It is convenient for maintenance and maintenance, and also overcomes the defects of easy folding and bending of the slender rod-shaped solid control rod.

Description

A system for reactor power control

technical field

The utility model belongs to the technical field of nuclear power, in particular to a system for controlling the power of a reactor.

Background technique

At present, the power control of the reactor is mainly through the insertion and lifting of control rods. This method mainly has the following shortcomings:

(1) The control rod is a slender rod-shaped structure, and it takes up a lot of space to lift and take it out, which is difficult;

(2) Accidents of sticking rods and sticking rods often occur during operation, threatening the safety of the unit operation;

(3) During the commissioning stage of the high temperature gas-cooled reactor, the sticking problem occurs from time to time, and it has not been completely solved yet;

(4) The material requirements of the control rod are relatively high, and the manufacturing is difficult;

(5) The fineness of the control rod to adjust the reactor power is poor.

Utility model content

The purpose of the utility model is to provide a reactor power control system in view of the problems existing in the current reactor power control.

In order to achieve the above object, the utility model adopts the following technical solutions to realize:

A reactor power control system includes a control rod module and a fluid supply module; wherein, a reactor includes a plurality of control rod modules, and the plurality of control rod modules share a set of fluid supply modules.

A further improvement of the present invention is that the control rod module includes an upper fluid tank, a lower fluid tank, a connecting straight pipe, an electric control slide valve, a drain valve, an isolation slide valve and a sealing slide valve; wherein,

The connecting straight pipe connects the upper fluid tank and the lower fluid tank arranged from top to bottom, the sealing slide valve is arranged in the upper fluid tank and can slide up and down in the upper fluid tank, and the isolation slide valve is arranged in the connecting straight pipe and can Sliding up and down in the connecting straight pipe, the lower fluid box forms a circulation loop with the fluid supply module through the electronically controlled slide valve and the relief valve.

A further improvement of the present utility model is that the fluid supply module includes a pressure fluid tank, a fluid return tank, a stabilized pump and a system pressure control valve; wherein,

The outlet of the fluid return tank is connected to the inlet of the stabilizing pump, the outlet of the stabilizing pump is connected to the inlet of the pressure fluid tank, and the first outlet of the pressure fluid tank is connected to the first inlet of the fluid return tank through the system pressure control valve; the pressure fluid The second outlet of the tank is connected to the first inlet of the electronically controlled spool valve, the first outlet of the lower fluid tank is connected to the second inlet of the electronically controlled spool valve, and the second outlet of the lower fluid tank is connected to the fluid return tank through the drain valve The second inlet of the electric control slide valve is connected to the third inlet of the fluid return tank, and the second outlet of the electronic control slide valve is connected to the inlet of the lower fluid tank.

The further improvement of the utility model lies in that an isolated space can be formed above and below the sealing slide valve in the upper fluid box, and can be slid upward under the push of the fluid at the lower part of the sealing slide valve. After the pressure of the fluid at the lower part of the sealing slide valve is reduced, gravity can swipe down.

The further improvement of the utility model lies in that an isolated space can be formed above and below the isolation slide valve in the connecting straight pipe, and can be slid upward under the push of the fluid at the lower part of the isolation slide valve. After the pressure of the fluid at the lower part of the isolation slide valve is reduced, gravity can swipe down.

A further improvement of the present invention lies in that the drain valve has a quick-opening function requirement, and after the drain valve receives a quick-opening command, the fluid in the lower fluid tank can be quickly discharged back into the fluid return tank.

The further improvement of the utility model is that the electronically controlled slide valve can precisely control the amount of fluid flowing from the pressure fluid tank to the lower fluid tank according to the command; the electronically controlled slide valve can precisely control the amount of fluid flowing from the lower fluid box according to the command. volume of fluid in the tank.

A further improvement of the utility model is that the combined action of the pressure-stabilizing pump and the system pressure control valve can ensure that the pressure of the pressure fluid tank and its connected pipelines is stabilized to pressure C, which is sufficient to push the isolation slide valve to the top of the straight pipe.

A further improvement of the utility model lies in that the volume of the fluid return tank is sufficient to ensure that after all the fluids in the lower pipeline of the isolation slide valve, the lower fluid tank and the pressure fluid tank return to the fluid return tank, the liquid level is not higher than the highest liquid level; The volume of the return tank is such that after the lower pipe of the isolation slide valve, the lower fluid tank and the pressure fluid tank are filled with fluid, the liquid level is not lower than the minimum liquid level.

A method for reactor power control, a system for reactor power control described in the method, includes the following steps:

Fill the upper pipe of the isolation spool valve and the upper fluid tank with fluid A with neutron absorption capacity, the amount of fluid A is more than when the isolation spool valve slides to the bottom of the connecting straight pipe, the liquid level of the upper fluid tank is higher than that of the upper part The minimum fluid level of the fluid tank, the amount of fluid A is less than The liquid level changes and slides up and down, isolating the upper fluid from the surrounding environment;

Fill fluid B with no neutron absorption capacity in the fluid return tank;

Start the stabilizer pump, fill the pressure fluid tank, the lower fluid tank, and the lower pipe of the isolation spool valve with fluid B, use the system pressure control valve to adjust the pressure of the pressure fluid tank to make it stable to the pressure C, and the pressure C is sufficient to push the isolation spool valve to the top of the straight pipe;

When the reactor needs to increase the load, adjust the electronically controlled spool valve, so that the fluid B in the lower fluid tank increases, the fluid pushes the isolation spool valve to move upward, the fluid B in the connecting straight pipe increases, and the fluid A decreases, and the neutron absorption capacity of the control rod module is controlled. weakened, the reactor power increased;

When the reactor needs to reduce the load, adjust the electronically controlled spool valve so that the fluid B in the lower fluid tank decreases, the fluid pushes the isolation spool valve to move down, the fluid A in the connecting straight pipe increases, the fluid B decreases, and the control rod module absorbs neutrons Increased capability and reduced reactor power;

When the reactor is protected, the drain valve is quickly opened, the fluid B in the lower fluid tank is quickly discharged back into the fluid return tank, the connecting straight pipe is filled with fluid A, and the reactor power is reduced to zero.

Compared with the prior art, the utility model has the following advantages:

The utility model provides a reactor power control system, which has obvious advantages in the following aspects compared with the currently commonly used system:

The utility model provides a reactor power control system, which adopts a plurality of control rod modules to cooperate with a set of fluid supply modules, so as to replace the slender rods that need to be moved frequently and finely, and reduce the failure rate of stuck rods, elastic rods, etc. Safer operation of the reactor.

Further, the control rod module adopts a liquid control rod with neutron absorption ability. By adjusting the composition of the neutron-absorbing liquid, it is easy to realize the adjustment of the reactivity value of the control rod, which is convenient for the design of the reactor, and the manufacturing of the control rod is easier. .

Further, when the isolation slide valve slides to the bottom of the connecting straight pipe, it is equivalent to inserting all the control rod modules into the reactor. The difference between the effective breeding coefficient of the reactor before and after the module is inserted into the reactor and the ratio of the effective breeding coefficient of the reactor before the insertion is called the reactivity value of the control rod module. The reactivity value of the control rod module 1 formed by fluid A should meet the requirements of the reactor control Require.

To sum up, the utility model changes the original adjustment of the slender rod-shaped solid control rod to the adjustment of the liquid, and the adjustment is more accurate; , operation, maintenance, and maintenance are convenient, and also overcomes the defects of slender rod-shaped solid control rods that are easy to break and bend; therefore, the utility model provides more reactor control methods.

Description of drawings

FIG. 1 is a structural block diagram of a reactor power control system of the present invention.

Description of reference numbers:

1- Control rod module, 2- Fluid supply module, 3- Upper fluid tank, 4- Connect straight pipe, 5- Lower fluid tank, 6- Electric control spool valve, 7- Relief valve, 8- Isolation spool valve, 9 -Sealing slide valve, 10-Pressure fluid tank, 11-Fluid return tank, 12-Pressure pump, 13-System pressure control valve.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings.

As shown in FIG. 1 , a system for controlling power of a reactor provided by the present invention includes a control rod module 1 and a fluid supply module 2; wherein, one reactor includes a plurality of control rod modules 1, and the plurality of control rod modules 1 share a set of fluid supply modules 2.

The control rod module 1 includes an upper fluid tank 3, a lower fluid tank 5, a connecting straight pipe 4, an electrically controlled slide valve 6, a relief valve 7, an isolation slide valve 8 and a sealing slide valve 9; wherein, the connecting straight pipe 4 The upper fluid tank 3 and the lower fluid tank 5 are connected from top to bottom. The sealing slide valve 9 is set in the upper fluid tank 3 and can slide up and down in the upper fluid tank 3. The isolation slide valve 8 is set in the connecting straight pipe 4 It can slide up and down in the connecting straight pipe 4, and the lower fluid tank 5 forms a circulation loop with the fluid supply module 2 through the electronically controlled slide valve 6 and the drain valve 7.

The fluid supply module 2 includes a pressure fluid tank 10, a fluid return tank 11, a stabilizer pump 12 and a system pressure control valve 13; wherein, the outlet of the fluid return tank 11 is connected to the inlet of the stabilizer pump 12, and the stabilizer pump 12 The outlet of the pressure fluid tank 10 is connected to the inlet of the pressure fluid tank 10, and the first outlet of the pressure fluid tank 10 is connected to the first inlet of the fluid return tank 11 through the system pressure control valve 13; the second outlet of the pressure fluid tank 10 is connected to the electric control slide valve 6, the first outlet of the lower fluid tank 5 is connected to the second inlet of the electronically controlled slide valve 6, and the second outlet of the lower fluid tank 5 is connected to the second inlet of the fluid return tank 11 through the relief valve 7, The first outlet of the electrically controlled spool valve 6 is connected to the third inlet of the fluid return tank 11 , and the second outlet of the electrically controlled spool valve 6 is connected to the inlet of the lower fluid tank 5 .

Among them, the sealing slide valve 9 has certain sealing performance requirements, and an isolated space can be formed on the upper and lower parts of the sealing slide valve 9; After the fluid pressure in the lower part of the valve 9 is reduced, it can slide down under the action of gravity. The isolation spool valve 8 has certain sealing performance requirements, and an isolated space can be formed above and below the isolation spool valve 8; After the lower fluid pressure is reduced, it can slide down under the force of gravity.

In addition, the drain valve 7 has a quick-opening function requirement. After the drain valve 7 receives a quick-opening command, the fluid in the lower fluid tank 5 can be quickly discharged back into the fluid return tank 11 . The electronically controlled spool valve 6 can precisely control the amount of fluid flowing into the lower fluid tank 5 from the pressure fluid tank 10 according to the command; fluid volume. The combined action of the stabilizer pump 12 and the system pressure control valve 13 can ensure that the pressure of the pressure fluid tank 10 and its connected pipelines is stabilized to a pressure C sufficient to push the isolation slide valve 8 to the top of the straight pipe 4 .

The volume of the fluid return tank 11 should meet the requirement that all the fluids in the lower pipeline of the isolation slide valve 8, the lower fluid tank 5, and the pressure fluid tank 10 return to the fluid return tank 11, and their liquid level should not be higher than the highest liquid level; the fluid return tank The volume of 11 should satisfy that after the lower pipeline of isolation slide valve 8, lower fluid tank 5, and pressure fluid tank 10 are filled with fluid, the liquid level should not be lower than the minimum liquid level.

The reactor power control system provided by the utility model specifically includes the following steps during operation:

The upper pipeline of the isolation slide valve 8 and the upper fluid tank 3 are filled with the fluid A with strong neutron absorption capacity. The liquid level of the upper fluid tank 3 is higher than the minimum liquid level of the upper fluid tank 3, and the amount of fluid A is less than that when the isolation slide valve 8 slides to the top of the connecting straight pipe 4, the liquid level of the upper fluid tank 3 is lower than the maximum liquid level of the upper fluid tank 3 The liquid level, the sealing slide valve 9 slides up and down with the change of the liquid level of the upper fluid tank 3, isolating the upper fluid and the surrounding environment; when the isolation slide valve 8 slides to the bottom of the connecting straight pipe 4, it is equivalent to inserting all the control rod modules 1 In the reactor, when the isolation slide valve 8 slides to the top of the connecting straight pipe 4, it is equivalent to pulling out all the control rod modules 1 from the reactor. The ratio of the coefficients is called the reactivity value of the control rod module 1, and the reactivity value of the control rod module 1 formed by the fluid A should meet the requirements of reactor control.

The fluid B with weak neutron absorption capacity is filled in the fluid return tank 11;

Start the stabilizer pump 12, fill the fluid B into the pressure fluid tank 10, the lower fluid tank 5, and the lower pipe of the isolation slide valve 8, and use the system pressure control valve 13 to adjust the pressure of the pressure fluid tank 10 to stabilize it to C;

When the reactor needs to increase the load, adjust the electronically controlled spool valve 6 so that the fluid B in the lower fluid tank 5 increases, the fluid pushes the isolation spool valve 8 to move upward, the fluid B in the connecting straight pipe 4 increases, and the fluid A decreases, and the control rod module 1 The ability to absorb neutrons is weakened, and the power of the reactor is increased;

When the reactor needs to reduce the load, adjust the electronically controlled spool valve 6 so that the fluid B in the lower fluid tank 5 decreases, the fluid pushes the isolation spool valve 8 to move down, the fluid A in the connecting straight pipe 4 increases, the fluid B decreases, and the control rod The ability of module 1 to absorb neutrons is enhanced, and the power of the reactor is reduced;

When the reactor is protected, the drain valve 7 is quickly opened, the fluid B in the lower fluid tank 5 is quickly discharged back into the fluid return tank 11, the connecting straight pipe 4 is filled with the fluid A, and the reactor power is reduced to zero.

Claims (9)

1. A system for reactor power control, comprising a control rod module (1) and a fluid supply module (2); wherein,

a reactor includes a plurality of control rod modules (1), the plurality of control rod modules (1) sharing a set of fluid supply modules (2).

2. A system for reactor power control according to claim 1, characterized in that the control rod module (1) comprises an upper fluid tank (3), a lower fluid tank (5), a connecting straight pipe (4), an electrically controlled slide valve (6), a blow-off valve (7), an isolation slide valve (8) and a sealing slide valve (9); wherein,

the connecting straight pipe (4) is connected with an upper fluid tank (3) and a lower fluid tank (5) which are arranged from top to bottom, the sealing slide valve (9) is arranged in the upper fluid tank (3) and can slide up and down in the upper fluid tank (3), the isolating slide valve (8) is arranged in the connecting straight pipe (4) and can slide up and down in the connecting straight pipe (4), and the lower fluid tank (5) and the fluid supply module (2) form a circulation loop through the electric control slide valve (6) and the drain valve (7).

3. A system for reactor power control according to claim 2, characterized in that the fluid supply module (2) comprises a pressure fluid tank (10), a fluid return tank (11), a pressure maintaining pump (12) and a system pressure control valve (13); wherein,

an outlet of the fluid return tank (11) is connected to an inlet of a pressure stabilizing pump (12), an outlet of the pressure stabilizing pump (12) is connected to an inlet of the pressure fluid tank (10), and a first outlet of the pressure fluid tank (10) is connected to a first inlet of the fluid return tank (11) through a system pressure control valve (13); the second outlet of the pressure fluid box (10) is connected to the first inlet of the electric control slide valve (6), the first outlet of the lower fluid box (5) is connected to the second inlet of the electric control slide valve (6), the second outlet of the lower fluid box (5) is connected to the second inlet of the fluid return box (11) through the drain valve (7), the first outlet of the electric control slide valve (6) is connected to the third inlet of the fluid return box (11), and the second outlet of the electric control slide valve (6) is connected to the inlet of the lower fluid box (5).

4. A reactor power control system according to claim 3, characterized in that the upper fluid tank (3) forms a separate space above and below the sealing slide valve (9) and can slide upwards under the push of the lower fluid of the sealing slide valve (9), and can slide downwards under the action of gravity after the lower fluid pressure of the sealing slide valve (9) is reduced.

5. A reactor power control system according to claim 3, characterized in that the connection straight pipe (4) can form isolated spaces above and below the isolation slide valve (8), and can slide upwards under the push of the fluid below the isolation slide valve (8), and can slide downwards under the action of gravity after the pressure of the fluid below the isolation slide valve (8) is reduced.

6. A system for reactor power control according to claim 3, characterized in that the bleeder valve (7) has a quick-opening function requirement, and the fluid in the lower fluid tank (5) can be quickly discharged back to the fluid return tank (11) after the bleeder valve (7) receives the quick-opening command.

7. A system for reactor power control according to claim 3, characterized in that the electrically controlled slide valve (6) is capable of accurately controlling the amount of fluid flowing from the pressure fluid tank (10) to the lower fluid tank (5) on command; the electrically controlled slide valve (6) can precisely control the amount of fluid flowing out of the lower fluid tank (5) to the fluid return tank (11) according to a command.

8. A reactor power control system according to claim 3 characterised in that the combination of the pressure maintaining pump (12) and the system pressure control valve (13) ensures that the pressure in the pressure fluid tank (10) and its associated piping is stabilised to a pressure C sufficient to push the isolation slide valve (8) to the top of the straight pipe (4).

9. A reactor power control system according to claim 3, characterized in that the volume of the fluid return tank (11) is such that the liquid level of all the fluid in the lower pipe of the isolation slide valve (8), the lower fluid tank (5) and the pressure fluid tank (10) is not higher than the highest liquid level after the fluid returns to the fluid return tank (11); the volume of the fluid return tank (11) meets the condition that the liquid level of the lower pipeline of the isolation slide valve (8), the lower fluid tank (5) and the pressure fluid tank (10) is not lower than the lowest liquid level after being filled with fluid.

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