JPH0236398A - Automatic cooling operation device for operation from hot state to cold state of pressurized water nuclear power plant - Google Patents

Abstract

PURPOSE:To reduce the operation load on an operator greatly by setting plural modes from a hot state to a cold state, operating a mode switch stepwise by the modes and finishing each mode respectively, and thus completing all the cooling modes. CONSTITUTION:A start command switch SW-A is equipped with a start switch S1, an off key S2, and a hold switch S3. A mode switch SW-B is equipped with a cooling switch M1 for cooling operation I and a cooling I completion lamp L1. Then remaining heat removal RHR isolation resetting operation is performed by an RHR isolation reset switch M2 and an RHR isolation resetting completion lamp L1 after the lamp L1 illuminates. Further, pressurizer gas-phase eliminating operation is performed by a pressurizer gas-phase elimination switch M2 and a pressurizer gas-phase elimination completion lamp L3 after the lamp L2 illuminates. Cooling operation II is performed by a cooling II switch M4 and a cooling II completion lamp L4 after the lamp L3 illuminates. Consequently, switches M1-M4 are operated in order at the start to perform semiautomatic cooling from the hot state to the cold state. Further, a mode switch SW-B' is equipped with a full-automatic switch AUTO.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is applied to cooling a pressurized water nuclear power plant from a hot state to a cold state when the plant is shut down. This invention relates to automatic cooling operation equipment for

[Prior art] When shutting down an operating pressurized water nuclear power plant, -
The secondary cooling system is first maintained in a state called a wet state, and then lowered to and maintained in a state called a cold state. mR
In the case, the secondary cooling bomb is operated, there is a gas phase in the pressurizer, and the water level is maintained by the filling flow 1 control valve. Also, the pressurizer pressure is maintained (at about 157.2K) by the pressurizer heater and spray valve. Furthermore, R
C3 temperature is kept constant (291,7° or 286°) by steam line pressure control by steam dump valve or atmospheric release valve.
．． (approximately 1°) is maintained. The extraction water pressure is maintained constant by an extraction water pressure control valve.

When the cooling system is cooled down to a cold state by manual operation, the temperature of the secondary cooling system becomes approximately 55° C., and the series of cooling modes at the time of stop, which is the object of the present application, ends.

Cooling operations in such pressurized water nuclear power plants have generally been performed manually, with some exceptions.

[Problems to be Solved by the Invention] As described above, cooling operations in pressurized water nuclear power plants are performed manually; i. The burden of plant operation and monitoring on operators is too great.

ii) There are operation parts that require complicated and advanced techniques, and if operators manually perform such plant operation operations, there is a possibility that errors may occur.

iii. Also, since it is manual, such operation control takes a huge amount of time.

Such problems have been pointed out in the past.

[Means for Solving the Problems] The present invention has been made to eliminate the above-mentioned drawbacks of the conventional technology. It was made to function automatically according to the sequence. To this end, we have introduced a new control system and are making full use of sequence operations.

According to a specific aspect of the invention, there is provided a nuclear reactor, a primary coolant circulation system communicating with the reactor and comprising a steam generator and a pressurizer, and a residual heat removal system and a coolant communication system communicating with the circulation system. In a shutdown operation control device for a pressurized water nuclear power plant having an extraction/filling system and a main steam system connected to the steam generator, a reactor cooling system (RC3) temperature control section, a reactor cooling system pressure control section, an extraction Water pressure control section, filling flow control section,
and a pressurizer water level control unit, and a reactor cooling system (RC3)
a first cooling mode control unit for lowering the temperature to a first predetermined temperature, lowering the reactor cooling system pressure to the first pressure, and raising and maintaining the pressurizer water level to a predetermined level; Residual heat removal isolation release has a reactor cooling system temperature control section, a reactor cooling system pressure control section, a pressurizer water level control section, an extraction water pressure control section, and an extraction flow rate control section, and performs the operation of releasing the isolation of the residual heat removal system. Mode control unit, filling flow rate control unit, reactor cooling system temperature control unit, extraction flow rate control unit, extraction water pressure ff
1I control section and a reactor cooling system pressure control section, a pressurizer gas phase extinction mode control section that performs an operation to eliminate the gas phase in the pressurizer, and a first and second reactor cooling system. a second cooling mode control section that has a system temperature control section and a residual heat removal flow rate control section and lowers the reactor cooling system temperature to a second predetermined temperature lower than the first predetermined temperature. Provided is an automatic cooling operation device for a pressurized water type nuclear power plant from a wet state to a cold state, which is characterized by the above features.

[Operation] Each mode is divided into modes from warm to cold, and each mode is automatically completed by operating the mask switch for each mode in stages.

Since each mode is automated in this way, the operation and burden on the operator is greatly reduced, erroneous operations can be prevented, and monitoring and operation time can be reduced, making it possible to maintain the healthy condition of the equipment. It becomes possible.

C Embodiment One embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a conceptual diagram of the cooling mode start switch operated by the operator when performing automatic cooling from a wet state to a cold state, and Figure 2 is a conceptual diagram of the cooling mode start switch operated by the operator in Figure 1. 1 is a conceptual diagram showing a control system of a primary cooling system of a nuclear reactor, and only the parts related to implementation of the present application are shown. Further, in FIG. 2A, reference numerals 5.7.15.
16.17.20 etc. is a conceptual diagram showing in more detail the RHR system that was conceptually completed, and shows the A system and the B system.

In the cooling mode start switch shown in FIG. 1, the upper start command switch section 5W-A includes a start switch S, an off switch S2, and a hold switch S, and a second break point. Method mode switch section 5W
-B includes a cooling I switch M1. which is operated to perform the cooling I operation. and a cooling I completion lamp L1 that indicates that the operation of the cooling l is completed; an RHR isolation release switch M2 that is operated to perform the operation of releasing the RHR isolation after the cooling l completion lamp L1 lights up; and the RHR RHR isolation isolation release completion lamp furnace 2 indicating that the isolation release operation has been completed. RHR isolation isolation release completion lamp furnace 2. Pressurizer gas phase extinguishing switch that is operated to perform the pressurizer gas phase extinguishing operation after lighting the RHR isolation isolation release completion lamp furnace 2. M1, the pressurizer gas phase extinction completion lamp L indicating that the operation of pressurizer gas phase extinction has been completed, and the pressurizer gas phase extinction completion lamp L lighting up, in order to perform the cooling operation. Operating cooling switch M4,
and a cooling completion lamp L indicating that the operation of the cooling H has been completed.When starting up, by operating these switches M1 to M4 in order, the state can be changed from a wet state to a cold state. Cooling is done semi-automatically.

The third stage fully automatic mode switch section 5W-B' has -
A fully automatic switch AUT○ is shown that automatically controls cooling from a wet state to a cold state when operated at a certain temperature, and a switch section 5W-C for setting the temperature increase rate is shown at the fourth stage. There is.

In FIG. 2, steam generator (SG) 1. - Various elements for controlling the primary cooling system, that is, the reactor cooling system (RC3), which is composed of the secondary cooling pump (RCP) 2, the reactor vessel <R/V) 3, and the pressurizer 4, are conceptually explained. These control elements include residual heat removal (RHR).
) pump 5, charging pump 6, residual heat removal (RHR) cooler 7, pressurizer heater 8, desalination tower 9, volume subgroup tank (VCT) 9°, and reactor cooling system (RC3). An atmosphere release valve 10 and a steam dump valve 11 that perform temperature control;
A pressurizer spray valve 12 that controls C3 pressure, a filling flow control valve 13 that controls pressurizer water level and filling flow rate, and R
The extraction water pressure control valve 14 controls the CS pressure, extraction flow rate, and extraction pressure, and the residual heat removal valve 14 controls the RC3 temperature.
RHR>Temperature control valve 15 and the first valve for sequence control
a low pressure extraction valve 16, a second low pressure extraction valve 17, an extraction orifice isolation valve 18, and an extraction line cut-off three-way valve 19, a residual heat removal (RHR) flow control valve 20, and a measurement to measure the pressurizer pressure pp. A device 30, a measuring device 31 that measures the RC3 pressure Pr, and a measuring device 32 that measures the RCS temperature Tr.
and a filling flow rate measuring device 33 that measures the filling flow rate Fc,
A measuring device 34 for measuring the water level of the pressurizer and an extraction water flow rate F
1 and the extraction water pressure P! A measuring device 36 is shown for measuring.

FIG. 2A shows the RHR pump 5 shown in FIG.
In addition to the cooler 7, the RHR temperature control valve 15, the first and second low pressure extraction valves 16,17, and the RHR flow control valve 20, the RHR bomb loop high temperature side inlet stop valve 201,
HR pump inlet C/V isolation valve 202 and RHR pump
Minimum flow line stop valve 203 and RHRHx
An outlet C/V isolation valve 204 and an RHR pump RWSP side population valve 205 are shown.

The operating modes for automatically advancing the cooling mode from the initial wet state to the cold state include a fully automatic method by operating switch AUT○, and a step-by-step operation of switches M, ~M. There is a breakpoint method in which human operations intervene, but in both cases, (A> continuous control that controls the analog quantity, and (B) sequence that performs on-off control of auxiliary equipment in an ordered manner) The breakpoint method is explained below.

Expansion 1 East 1 In Figure 2, the initial conditions are -order cooling pump (
RCP) 2 is in operation, the pressurizer 4 has a gas phase (later filled with water), and the water level is maintained by the filling flow rate control valve 13. Further, the pressurizer pressure pp is maintained by the pressurizer heater 8 and the spray valve 12. Furthermore, R.C.
3. The temperature Tr is maintained constant by steam line pressure control using the steam dump valve 11 or the atmosphere release valve 10.

The extraction water pressure PI is maintained constant by the extraction water pressure control valve 14.

Under these conditions, when the cooling I switch M of the mode switch section 5W-B is pressed and the start switch Sl of the start command switch section 5t-A is pressed, the mode becomes the cooling I mode. . Cooling I
The control circuit in the mode is shown in FIGS. 3A and 3B, and an AND circuit 301 performs an AND operation between the signal from the cooling I switch M1, the signal from the start switch S1, and the signal representing the cooling I start condition. and outputs a start command when all of these signals are met. Cooling ■ Starting conditions include, for example, that the A and C extraction orifice isolation valves are fully closed, the B extraction orifice isolation valve is fully open, and the deviation from the RCS pressure set value is within 5KH/am2. AND circuit 301 when all 9 conditions are satisfied
When it outputs a start command and enters the cooling I mode, the following operations occur.

(a-1) In response to the activation command from the AND circuit 301, the RCS temperature control unit 302 controls the steam dump valve 11 or the atmosphere release valve 10 to open, thereby reducing the RCs by 1 degree according to a predetermined cooling rate. In other words, the RC3C10 set value Tref from the temperature decreasing rate setter 303 input to the RC3 temperature control unit 302 is set to the cooling rate setting switch unit 5W with the temperature at that time as the initial value.
The temperature is lowered at the rate of temperature drop or cooling set by -C, and as a result, the RC3 temperature control section 302
As the 3C10 set value Tref decreases, the steam dump valve 1
1 or the atmosphere release valve 10, and the RCS temperature is lowered according to a predetermined cooling rate set by the cooling rate setting switch unit 5W-C.

(a-2> The start command from the AND circuit 301 is R
It is also applied to the C3 pressure control section 304, thereby causing the R
The C3 pressure control unit 304 controls the RC3C10 to a predetermined RC.
Pressurizer heater 8 and spray valve 12 so that the pressure is 3.
to control the pressure drop.

That is, the RC3 pressure control unit 304 receives the pressurizer pressure signal P rcs from the measuring device 30 also shown in FIG. 1 and the pressure set value Pref from the function generator 305 . The function generator 305 inputs the RCS temperature signal rcs from the measuring device 32 shown in FIG. 1, and outputs a pressure signal corresponding to the RC3 temperature signal Trcs as a pressure set value P ref. By R
The C3 pressure control unit 304 sets the RC3 pressure Pres to the pressure set value Pref (that is, the RC3 corresponding to RC3C10).
pressure), pressurizer heater 8 and spray valve 12
Pressure control is performed by controlling .

When the RC9 pressure drops to 110 to 115 K, the measuring device 3
The control target changes to the RC3 pressure Pr measured by 1.

During this mode, the group 1 pressurizer backup heater 8' is left on, and the pressure is controlled by the pressurizer spray valve 12 and the pressurizer proportional regulator 8. In addition, due to the low pressure signal from the comparison section 306, the group 2 pressurizer back-up heater 8'
Insert °.

(a,) The activation command from the AND circuit 301 is also given to the extraction pressure control section 307, whereby the extraction water pressure P1 measured by the measuring device 36 is controlled by the extraction pressure control valve 14. The initial setting value for extraction water pressure is 22Kg/c.
m2, and when the comparator 308 detects an RCS pressure below 45 Kg/cm2, the setting device 309 decreases the set value by IKg/cm2 per minute until the set value is 12 Kg/cm2.

(a-<) The activation command from the AND circuit 301 is also given to the filling flow rate control section 310, and as a result, the filling flow rate control section 310 starts cooling and starts the filling flow rate control section 1.
3 to gradually increase the filling flow rate to raise the water level of the pressurizer to 9.
Increase to 5%. When the comparator 311 detects that the pressurizer water level from the measuring device 34 has reached 95%, the signal is sent to the pressurizer water level controller 3 via the AND circuit 312.
13, whereby the filling flow rate control section 13 is controlled by the filling flow 1 control section 310 and the pressurizer water level control section 31.
3. Note that the filling and extraction flow rate setting conditions are input to the other input of the AND circuit 312, and the setting conditions include, for example, the deviation of the filling flow rate and the total extraction flow rate from the set value of the filling flow rate by 0.7 m'/ h and 1
．． It must be 3m3/h or less.

(a-s) When the extraction flow rate decreases as the RCS pressure decreases and the comparison unit 314 detects that the extraction flow rate F1 from the measuring device 35 has fallen below 12 m'/h, the signal is sent via the AND circuit 315. Extraction orifice isolation valve 18 (
In addition to the already open B extraction orifice isolation valve provided in Figure 2), the A and C extraction orifice isolation valves are initially opened to ensure a predetermined flow rate (block 316).

(a-6) RC3 pressure signal Pr from the measuring device 31
The signal from the comparator 317 that detects that the weight has fallen to 26.5 Kg/0m2, the RC from the measuring device 32
8. A signal from the comparator 318 that detects that the temperature Tr has fallen to 160°C, and a signal from the comparator 31 that detects that the water level in the pressurizer from the measuring device 34 has reached 95% or more.
When receiving all the signals starting from 1, the AND circuit 319 outputs a cooling I completion signal. The cooling I completion signal turns on the cooling I completion lamp L1, and the cooling I completion signal is also applied to the OR circuit 320, which outputs a holding signal via the AND circuit 321. Based on this holding signal, all controls, including keeping the RC3 temperature and RC3 pressure constant, are controlled to maintain the current process state.

(a-t) If an abnormality occurs during cooling, the [cooling I abnormality] signal is also given to the OR circuit 320 and the AND circuit 3
A holding signal is outputted through 21, thereby automatically holding the current state. [Cooling I abnormality]
, the deviation between the RC3 pressure and the set value is 5Kg/am.
2 or more, but the deviation between the RCS temperature and the set value is 4℃ or more, but the RC3 pressure is 60 KB/am2 or less and the pressure storage tank top valve is open, or the RCS pressure is 22 Kg/am2 Examples include the following cases.

(a4) Also, when the signal from the holding switch S3 shown in FIG. hold.

(a-s) If the off switch S2, also shown in FIG. 1, is operated, all control is transferred from the automated logic to the normal logic.

Note that the operations related to "hold" and "off" are the same in each mode described below.

b. Paper mode After the cooling I mode is achieved, that is, after the cooling I completion lamp L1 lights up, press the residual heat removal (RHR) isolation release switch M2 of the mode switch section 5W-B and press the start switch S1. Residual heat removal isolation release, that is, RHR isolation release mode is entered.

The operation of the RHR isolation release mode is shown in FIGS. 4A and 4B. An AND operation is performed with the cooling I completion signal from the AND circuit 319 in FIG. 3B as a condition, and when all these signals are satisfied, R
When all six conditions for outputting the activation command for the HR isolation release mode are satisfied and the AND circuit 401 outputs the activation command and enters the RHR isolation release mode, the following operations occur.

(b-1> Based on the start command from the AND circuit 401, the RC3 temperature control unit 402 performs the same control as in the cooling mode and cools down to 145°C.The RC3 pressure control unit 403 and the pressurizer water level control unit 404 The RC3 pressure and pressurizer water level are 26 Kg/cm' and 95%, respectively.
Keep it as it is.

(b-2) Along with the mode activation from the AND circuit 401, the RHR pump minimum flow line stop valve 2
03 (Fig. 2A) is fully opened (block 405), and the operation notification causes the RHR pump RWSP side population valve 205 to be fully opened (block 406) and the RHR pump inlet C/V isolation valve 202 to be fully opened (block 407). Encourage personnel to operate.

(b-j) Under the conditions of (b-,) above, the low pressure extraction line stop valve 16 is fully opened (block 408), the low pressure extraction flow rate control valve 17 is opened to 10% opening (block 409), (reverse) (Start of pressure operation) Gradually increase the set value of extraction water pressure (Block 410)
), when it reaches 23 kg/cm2, valve 17 (HCv1
02) is fully closed, then close the valve 16 (V-R1+-026
A, B) Fully close the door (block 411) and lower the extraction water pressure set value to 12 kg/cm2. (Reverse pressure completed) (b-,,) Fully close the RHR cooler outlet flow control valve 15 (block 412), and by the operation notification,
Fully open the RHR Bonproop high temperature side inlet stop valve 201 and the RHRHx outlet C/V isolation valve 204 (RH-043A,
B) Fully closed, A, B prompts the operator to start the RHR pump 5 (blocks 413 and 414).

(b-s) After 3 minutes, valve 16 (V-RH-026^
, B) is again interrupted, and in block 415), the extraction water pressure control 4) is switched from 0 to the extraction flow rate control j4416.

(b-s) 1 minute later, valve 17 (HCV-102)
After switching from normal extraction to low pressure extraction by gradually opening and then fully opening, close the V-CS-004^, B, and C, that is, the extraction orifice isolation valve 18, to the condyles of^, B, and C at 20 second intervals (block 417).

(b, -,) V-CS-004A, B, C, that is, the extraction orifice isolation valve 18 is fully closed, and the mode is completed.

After the C1 port "' mode residual heat removal isolation release mode is achieved, press the pressurizer gas phase extinction switch M of the mode switch section 5W-B and press the start switch Sl, the pressurizer gas phase extinction mode will be activated. The operation of the pressurizer gas phase extinction mode is the fifth Al12 and the fifth
The AND circuit 501 receives the operation signal from the pressurizer vapor phase extinguishing switch M, and the starting switch S, as shown in FIG.
and the R)lR1a release release completion signal from the AND circuit 430 in FIG. When all the 0 conditions for outputting the start command for the extinction mode are added up, the AND circuit 501 outputs the start command and enters the pressurizer gas phase extinction mode, the following operation occurs.

(c-1) The activation command from the AND circuit 501 is given to the filling flow rate control section 502 and the extraction flow rate control section 503, so that the filling flow rate and the extraction flow rate are respectively 3+e'/
Control is performed in increments of h/min. Extraction flow rate is 20+i
'/h is the upper limit, and the filling flow rate is Loe than the balance flow rate.
By increasing A'/h, the water level of the pressurizer is raised.

(c-,) Note that the RC3 pressure at this time is controlled to 26 kg/c so2 by the RC3 pressure control section 504, and the RC3 pressure is
8 temperature is determined by the RC3 temperature control unit 505 at that time.
Temperature controlled.

(C~,) The difference between the filling flow rate and the balance flow rate decreases from 10 to 7 to 51/h as the water level of the pressurizer increases.

(c−+) that the comparison unit 507 detected that the RC3 pressure exceeded 28 kg/cm”, or that the comparison unit 508 detected that the pressure increase rate exceeded 2 kg/aI11”7 minutes; OR circuit 509 representing
The signal from the comparator 506 and the signal from the comparator 506 indicating that the water level of the pressurizer has risen to 95% or more are connected to the AND circuit 5.
10, the AND circuit 510 outputs a gas phase extinction signal that determines that the pressurizer gas phase has disappeared, and in response to the gas phase extinction signal, the extraction water pressure control unit 511 controls the extraction flow rate control to RC3 full water. The pressure is controlled at the same time.

(c-5) The gas phase annihilation signal from the AND circuit 510 is also given to the AND circuit 513 via the 5-minute delay circuit 512, and when the system is settled after 5 minutes, the AND circuit 513 Outputs the extinction completion signal and completes the pressurizer gas phase extinction mode.

(e-s) Thereafter, if necessary, the filling flow rate controller 502 controls the filling flow rate to 31 through the AND circuit 518.
+13/h/min, and the comparator 519 detects that the filling flow rate has become 50 m'/h, or the comparator 520 detects that the extraction flow rate has become 56 m'/h. For example, a signal from the OR circuit 521 indicating this is sent to the AND circuit 522 and the flip-flop 5.
23 to the filling flow rate control section 502 to stop the control section 502 from increasing the filling flow rate and maintain that state.

After the pressurizer gas phase extinction mode is achieved, that is, after the pressurizer gas phase extinction completion lamp L lights up, press the cooling switch M of the mode switch section 5W-H, Start switch S
Press , to enter cooling ■ mode. The operation in the cooling mode is shown in FIG.
The operation signal from the switch M4, the operation signal from the start switch S, and the gas phase extinction completion signal from the AND circuit 513 in FIG. Outputs a startup command for cooling ■ mode when

When all the conditions are satisfied and the AND circuit 601 outputs a start command and enters the cooling mode, the following operation occurs.

(cll> By the start command of the AND circuit 601, first, an operation notification is sent to the RHR cooler outlet isolation valve 204.
(V-RH-043^, B) prompts the operator to fully open the engine (block 602).

(d-z) Then, after one minute has elapsed by the delay circuit 604, the RHR warming section 603 sets the RHR cooler outlet flow tX control valve 15 ()ICV-603, 613>
Open gradually.

(d-, > RHR input temperature 605 and RC3C182
When the comparator 606 detects that the difference between , Stop the opening operation of HCV-603, 613 and maintain that state. (Warming completed) (d-t) In addition, the 30°C or lower signal from the AND circuit 607 is sent to the RHR flow rate control unit 61 via the OR circuit 612.
3, thereby controlling the RHR flow rate control section 613.
is RHR cooler bypass flow control valve 20 (FCv-
604, 614> gradually to increase the RHR flow rate,
If the comparison unit 614 detects that the speed exceeds 580 m'/h, the RHR pump minimum 7o-line stop valve 2
03 (FCV601, 611) are fully closed (block 615).

1.) Further increase the RHR flow rate to 680m'/h
If the comparator 617 detects that F! @618 and NOT
It is applied to the switching device 620 via the circuit 619, whereby the RHR flow rate control unit 613 switches the RHRHx bypass flow control valve FCV-8 to maintain the flow rate of 680 m'/h.
Controls 04,614.

(d-,) Flow rate 680 m' from AND circuit 618
The /h signal is also given to the second RC3 temperature control section 621, which causes the control section 621 to adjust the cooling rate set by the cooling rate setting switch section 5W-C also shown in FIG. With the set temperature Tref from the temperature decreasing rate setting device 622 being lowered by the RHRHx outlet flow rate control valve 15
(IICV-603, 613) to control RC3C1
82 is being cooled down.

(c17) Until the comparison unit 623 detects RC3C10145°C, the first RC3 temperature control unit 624 performs RC3 temperature control by controlling the turbine bypass valve or the main steam relief valve.

<L,) Pressurizer liquidus temperature 625 and R, C5 temperature 32
When the comparator 626 detects that the difference between the
(PCV-451^, B) is fully opened (block 628).

(d-,) After that, when the comparator 629 detects that the RC5 temperature has fallen to 55°C, it outputs a cooling completion signal and lights up the completion lamp L4, and also the OR circuit 630 and the AND circuit 631 A holding signal is outputted via. This means that the series of modes from Cooling I to Cooling ■ have all been completed.

In realizing automation according to the present invention, a large amount of continuous analog control and sequence control are utilized.

[Effects of the Invention] As described above, according to the present invention, it is possible to divide the state from wet state to cold state into a plurality of modes, operate the mode switch in stages for each mode to automatically complete the mode, and complete all cooling modes. This has the effect of significantly reducing the operation and burden on the operator, preventing malfunctions, and further reducing operation time, making it possible to maintain the sound condition of the equipment. There is.

[Brief explanation of the drawing]

FIG. 1 is a diagram conceptually showing mode switches for each mode divided according to the present invention, FIG. 2 is a diagram conceptually showing a nuclear reactor control system to which the present invention can be applied, and FIG. A detailed diagram showing the residual heat removal system in Figure 2, Figure 3A, and Figure 3.
Figure B is an action explanatory diagram for explaining the control of the cooling I mode, Figures 4A and 4B are action explanatory diagrams for explaining the control of the residual heat removal isolation release mode, and Figures 5A and 5B are operation explanatory diagrams for explaining the control of the residual heat removal isolation release mode. FIG. 6 is an explanatory diagram for explaining the control in the pressure vessel gas phase extinction mode. FIG. 6 is an explanatory diagram for explaining the control in the cooling mode. In the figure, M is the cooling I switch, L
l is the cooling I completion lamp, M2 is the residual heat removal isolation release switch, L2 is the residual heat removal isolation release completion lamp, M is the pressurizer gas phase extinction switch, L is the pressurizer gas phase extinction completion lamp,
M4 is the cooling ■ switch, L4 is the cooling H completion lamp, St
is a start switch, S2 is an off switch, S is a hold switch, 1 is a steam generator, 2 is a primary cooling bomb, 3 is a reactor vessel, 4 is a pressurizer, 5 is a residual heat removal pump, 6 is a filling pump, 7 is a residual heat removal cooler, 8 is a pressurizer heater, 9 is a demineralization tower, 9° is a volume control tank, 10 is an atmosphere release valve, 11
is a steam dump valve, 12 is a pressurizer spray valve, 13 is a filling flow rate control valve, 14 is an extraction water pressure control valve, 15 is a residual heat removal temperature control valve, 16 is a first low pressure extraction valve, 17 is a second Low pressure extraction valve, 18 is extraction orifice isolation valve, 19 is extraction line switching three-way valve, 30 is pressurizer pressure measuring device, 31 is R
C3 pressure measuring device, 32 is RCS temperature measuring device 1.33
34 is a filling flow rate measuring device, 34 is a pressurizer water level measuring device, and 35 is a filling flow rate measuring device.
36 is an extracted water flow rate measuring device, and 36 is an extracted water pressure measuring device.

Claims (1)

[Claims] (1) A nuclear reactor, a primary coolant circulation system connected to the reactor and equipped with a steam generator and a pressurizer, a residual heat removal system and a coolant extraction/filling system connected to the circulation system, and the steam In a shutdown operation control system for a pressurized water nuclear power plant that has a main steam system connected to a generator, it includes a reactor cooling system (RCS) temperature control section, a reactor cooling system pressure control section, an extraction water pressure control section, and a charging flow rate control section. a reactor cooling system (RCS) temperature to a first predetermined temperature, a reactor cooling system pressure to a first pressure, and a pressurizer water level to a predetermined level. a first cooling mode control section for raising and maintaining the temperature at a level of a residual heat removal isolation release mode control unit that performs the release operation of residual heat removal system isolation; a charging flow rate control unit; a reactor cooling system temperature control unit; an extraction flow rate control unit; an extraction water pressure control unit; a pressurizer gas phase extinction mode control section that has a reactor cooling system pressure control section and performs an operation to eliminate the gas phase within the pressurizer; first and second reactor cooling system temperature control sections; A second cooling mode control section having a residual heat removal flow rate control section and lowering the reactor cooling system temperature to a second predetermined temperature lower than the first predetermined temperature. , automatic cooling operation device for pressurized water nuclear power plants from hot to cold.