JPS5932896A - Reactor power control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Invention Q", pressure in the reactor pressure vessel. ＆Cho 6-Suppress/
In this way, the output of the JQ furnace plant which controls the steam flow 1 to the turbine is directly connected to the 1 equipment.

[Technical Background of the Invention); ↓] Firstly, in a boiling water reactor plant, the 111 force fli control system is used, and the fl# (1＾j
11. of! Ii1. l foil 111 method,
There is a method of controlling the steam flow t(4) to the turbine by changing the opening degree of the main control valve or the turbine bypass valve.

In equation B, which controls the output of the plant by the recirculation piece (diversion - control f++), L, p + circulation high j flow 1 in the reactor pressure vessel.
By cyclizing 11, the value of po-fF'' (generated) is changed, and the reactor output is controlled by utilizing the increase/decrease in the reactivity coefficient of 71ξi1'. For example, 1L) jrfI (11 When the flow VA is increased, d and id in the pressure vessel decrease in a vortex +7 ((-), and the reactivity becomes 11
19 addition, "1, J' at the time of whispering], 1. a,,Il￥
, to! 7 hll r<j tIf 6 inside t7)
y1! The reactor output increases until ii + 8 lances occur, and a low output level I is achieved.

From 1 to 4j, -; 4j to υ, 11, the output is changed using this method. flj:l#1
rir, Vice's "rl2A6Koyamashii4kJre3J'
NorI゛, it takes 1 time to set up, the load is relatively small), -' 〒11+1J changes 4゛(1 in 34 times,
The output of a nuclear reactor plant is expressed as [fluctuation of one load (・′(−−・・[
Q, 11 Tree 191 (to change the main steam control valve or (), the opening of the turbine bypass valve + (+) The method is first-order (7
Problems like S1)6. 4 no f ie boiling water type JjK
When the pressure is outside jξ (one-to-one, for example, two ↑-steam) 1 [1 reduction valve opening 4B- is decreased, the reactor-r reactor J -1 month inside the vessel) -1 is the upper arm (7 points void in the reactor core/)・No decrease/,.

There is also a possibility that this/kome reactor core K kJ will be transitional (the reaction of L will be introduced and the flux will increase, and the reactor will become 0.0 and C). . Therefore, as shown in FIG. 1, it is essential to have a device that can control the pressure inside the pressure vessel at the same time as controlling the output of the zero runt.

Now, to explain the configuration shown in Fig. 1, the soft water in the reactor pressure vessel 1 is heated as it passes through the reactor core 2, becomes main steam, and then flows through the main steam shield 3 to the turbine. 4, and the rotation of this turbine 4 generates a generator 5.
is driven.

In addition, the main steam after driving the turbine 4 once flows into the condenser 6, is cooled and liquefied, and is returned through the water supply pipe 7 to the Kaji furnace bar power vessel 1. l! IL'
, υj in pipe 3, main steam q (, control valve 8 is inserted, steam power (1 contract, valve B t)) l flow 11111 into turbine bypass piping 9 bypassing ascites G-\ A turbine bypass valve 5 and a bypass valve 10 are inserted.

Therefore, the configuration of the reactor power control unit installed in this nuclear reactor plant is as follows.

- Feed 111 from the cow's turbine 4, and the turbine load signal 11 and negative i! Load setter output signal 131d' received from J setter 12, addition f'4: f, '4x
To 4:1. ．． - is added and outputted as an adder output signal 15. On the other hand, the pressure regulator 16 is connected to the pressure signal IA in the reactor pressure vessel 1 and the set pressure signal 16A.
The odor 1 is compared and calculated, and the result is outputted as the pressure regulator output signal 17. And the above υII arithmetic operation n
Pressure regulator 1 output signal 15 from pressure regulator 16
4i power signal 17 is input to the low value priority circuit) 8, and the ball No. 1 which indicates the lower value is the low value 1 destination circuit output No. 19 (7 and outputs i) The main steam control valve 8 is controlled by 19.When the reactor is operating normally, the pressure regulator 114 and 1-17 are lower than the adding unit power ratio @15, so normally The pressure regulator force signal 17 becomes the low priority circuit output signal 19.

゛Pressure jlA in 9 device 20 with differential pressure function] The difference between regulator output signal 17 and low value priority circuit output signal 19 is calculated,
The turbine pressure valve 10 is controlled by the differential pressure calculation unit quantity Q, -1 and 2 from this difference) L calculation unit 20.

[Problems with background technology]

A pressure regulator 16 inputs a pressure signal in the reactor pressure vessel 1 and outputs a signal 17 for adjusting the pressure in the pressure vessel I to a predetermined set value.

Then, the output signal 17 of the 7 lever is sent to the turbine piston valve 10.
This is the source of the control signal. Therefore, the turbine bypass valve 10 is designed to suppress pressure fluctuations in the pressure vessel 1 due to changes in the opening degree of the main steam regulator valve 80.
It is desirable to perform a quick follow-up operation with the pressure regulator 16, but since a delay time corresponding to the operating time of the pressure regulator 16 occurs, it is not possible to quickly follow the control valve 7 with the pressure regulator 16, and the pressure vessel There were problems in that pressure fluctuations within the reactor core and large fluctuations in the neutral flux in the reactor core were unavoidable.

Figure 2 shows the frequency fluctuation (A) of the electric power system, which is the load, and
It shows the relationship between the main steam control, the change in the opening degree of the valve 8 (B), and the change in the opening degree of the turbine bypass valve θ.

When the frequency of the power system fluctuates by -4 as shown in Figure 2), the main steam control valve 8 moves in the direction of suppressing this system frequency fluctuation (B
). For example, as the system frequency increases, the opening degree of the control valve 8 decreases to reduce the steam flow rate to the turbine 4.

Further, the operation of the turbine pinosus valve 10 is opposite to that of the regulating valve 8 as shown in (C), and operates in the direction of suppressing pressure fluctuations caused by the regulating valve 8. For example, when the opening degree of the regulating valve 8 decreases, in order to suppress the increase in the internal force of the reactor ffE force vessel 1, the Ipass valve 10 increases its opening degree and increases the flow rate to the turbine pinos pipe 9. It becomes like this. However, in the conventional device shown in FIG. (C)
It was desired that there would be no delay as shown by the broken line in the figure.

[Purpose of the invention]

The present invention was made based on these circumstances, and its purpose is to suppress load fluctuations without causing sudden pressure fluctuations in the reactor I and the force vessel or large fluctuations in neutron flux. An object of the present invention is to provide an output control device for a Q sub-reactor plant (which can quickly follow the flow rate of steam to a turbine).

[Summary of the invention]

An output control device (#, i, load setting device) according to the present invention; , a pressure regulator that outputs a difference signal between the pressure in the reactor pressure vessel and a set pressure signal; a difference calculator that inputs a steam control valve control signal and outputs a pressure deviation signal; a positive limiter that adds the entire positive limit value to the pressure deviation signal output from the difference calculator; Compare the negative limiter that adds a negative limit value to the signal, the thermal output detection signal in the reactor pressure vessel, and the main steam control valve control signal output from the addition calculator 1 to obtain the difference signal. A comparator that outputs negative i Wj and a load (i) output from this comparator and the output signals from both limiters are input, and a signal indicating an intermediate value from among the three signals is input to the turbine pipe. - A pi/p valve control signal selection circuit that outputs a gas valve opening request signal.

[Embodiments of the invention]

FIG. 3 shows an embodiment of the present invention.

Since the IN configuration of the nuclear reactor plant is the same as that in FIG. 1, the same reference numerals are given and the explanation will be omitted.

The configuration of the power control device for a nuclear reactor plant is as follows.

The turbine load signal 11 sent from the Saizu turbine 4 and the load setter output signal 13 from the load setter 12 are added in the addition calculator 14, and the addition calculator output signal is used to control the main steam control valve 8. Adjustment valve control signal 15' and I
7 is output.

On the other hand, the main steam control valve control signal 15' is manually input to the comparator 23 together with the thermal output detection signal 22 in the reactor pressure regulator I,
Both signals 15', 22 are compared in a comparator 23,
The difference signal is output as the load signal 24. On the other hand, the pressure signal IA in the reactor pressure vessel 1 and the set pressure signal 16A
are compared and calculated in the pressure regulator 16, and the result is outputted as a pressure regulator output signal 17 and L-. and the main steam control valve control signal 15'kl, pressure regulator 1
difference calculator 25 along with pressure regulator output signal 17 from 6
and in the differential enumerator 25, both signals 15', 17
The LL force deviation signal 26 is generated by comparing the LL force deviation signal 26. This pressure deviation signal 26 is then divided into two parts, one of which is input to a positive limiter 27 and applied with a limit value corresponding to several to 10% of the reference output, resulting in a positive differential pressure signal, ? 7A and [7 are output. The other signal is input to the negative limiter 28, where a negative limit value of 4.5 times corresponding to several to 10 points of the reference output is subtracted, and the resultant signal is output as a negative differential pressure signal 28A. The load signal 24, positive differential pressure signal 27k, and negative differential pressure signal 28 are inputted to a binosu valve control number selection circuit 29. This pieno! The valve control signal selection circuit 29 selects the above three signals 24°, ? 7 A, 2,'? Select one signal 1 showing an intermediate value from A, and apply the selected signal to the turbine.
This is output to the Talvin bypass valve 1θ as a -1 degree request signal 30.
The opening degree of the turbine piston valve IQ is controlled by.

Here, during the reactor rated operation, the pressure regulator output signal 17
and the main steam control valve control signal 15'.
Therefore, the pressure deviation signal 26 is zero since there is no need to deactivate the turbine seat valve. Therefore, 1fill bypass valve? The positive difference signal input to the 1llll signal selection circuit 29, ? 7A and negative differential pressure signal 21? The values of A are the positive limit signal and negative jfill limit signal 28A, respectively.

Earth, ・4-(・! The load signal 24, which is another human input signal to the valve control signal selection circuit 29, is also zero during rated reactor operation.), so at least the load signal is 24 is i
As long as the load signal 24 changes between the E limit value and the Koma limit value, the turbine pi/well opening request No. 30
As bypass valve control 1,1 to 1 at the same time turbine load signal 1
This also controls the main steam control valve 8. Therefore, if the load setting device output signal 13 from the load setting device 12 is an output reduction request and the output is 1, then Q, L, main steam υ
11 to the reducing valve 8 to control the main steam regulating valve (M number 15' is output as a word 17 for opening reduction request, and at the same time J-
For the Himpais valve 10, 7 is output as the turbine valve opening request signal 17.
,ru. Conclusion In the Song Dynasty, it was possible to suppress the disturbance in the upper pressure range that occurs due to the decrease in the opening of the main steam control valve 8 by quickly increasing the opening of the turbine pi-slot valve, and the negative M side In response to the power reduction request, the turbine 4.
could reduce the steam flow rate and reduce the generator 50 output. - On the contrary, if an output increase request is made from the load setting device 12, the main steam control valve 8
At the same time, the steam flow to the turbine 4 (4) is increased, and at the same time the opening degree of the turbine pipe gas valve 10 ir:,1
Due to the reduced opening, part of the surplus steam that was flowing to the turbine pipe 9 flows to the turbine 4 side)
1, the output of 65 is on the upper row, and the load setting is set to 12.
If you don't meet the demands of the. (Also in the case of lever 7, a sudden pressure drop in the reactor pressure vessel 1 and a large decrease in neutron flux are suppressed).

Next, some abnormality occurs and the value of the 4-load signal 24 changes to the stop difference LL1. - If the signal deviates from the range of the negative differential pressure signal 28A from 27 to The valve opening request signal 30 is output from the binos and valve control signal selection circuit 29, and based on either of these signals, the turbine bypass valve 10 is selected.
is ii+l being controlled.

Therefore, in the above configuration, during the rated operation of the reactor, the turbine valve 10 is controlled by the load signal 24 outputted from the comparator 23. As shown by the broken line in FIG. 2, the turbine/railway valve 10 suppresses fluctuations in the system frequency, pressure fluctuations in the force vessel 1, and neutron flux fluctuations by the operation of the turbine/railway valve 10. can do.

〔Effect of the invention〕

As described above, 11i of the reactor flut according to the present invention
According to the power control device, the main steam control valve and the turbine pipe
The PS valve can be opened and closed with great effort by following system frequency fluctuations, and as a result, even in response to load demands that change within a short period of time, rapid pressure fluctuations in the reactor pressure vessel and large neutron flux fluctuations can be avoided. Weird Xi! It is possible to quickly follow the steam flow rate to the turbine without causing any load fluctuations. In response, the IR can be used to supply power.

[Brief explanation of the drawing]

Figure 1 shows a conventional example of the output control range of a nuclear reactor plant. Diagram showing changes in the opening degree of the turbine binos 9 valve, Figure 3 V, 1
FIG. 1 is a configuration diagram of an output control device for a nuclear reactor plant showing an embodiment of the present invention. l... Reactor pressure vessel, 3... Main steam piping, 4...
・Li~bin, 5... Generator, 8... Main steam control valve,
9... Turbine pipe 9 piping, 10... Turbine pipe! valve, 11...turbine load signal, -12...
..., load setting device, 14...addition η' calculation unit, 15'.
...Main steam control valve control No. 18, 16...Pressure, 1. i
I rectifier, 23... Comparator, 24... Load signal, 25
...Difference wave n device, 26...Pressure difference r-L signal, 27
...Positive limiter, 28...Negative limiter, 27k...
・Positive differential pressure signal, 28A... Negative differential pressure signal, 29... Bypass valve control signal selection circuit, ? 0...Turbine by...
9th valve opening request signal.

Claims (1)

[Claims] Load setting Load setter Output signal of load setter and turbine load 1. −? a pressure A controller that outputs a difference signal between a pressure signal in the reactor pressure vessel and a set pressure signal; The difference signal output from this pressure regulator and i? f + /j The main steam control valve control signal outputted from the addition operator W is inputted manually to a difference calculator which inputs the pressure deviation signal, and a positive difference is added to the pressure deviation signal output from this difference calculator. a positive limiter for adding a negative limit value to the pressure deviation signal; a negative limiter for adding a negative limit value to the pressure deviation signal; A comparator that outputs the difference signal as a load signal with the main steam control valve control signal at a ratio of 11'=> 1, and the load signal output from this comparator and the output signals from both limiters are manually input. Bypass valve control (Ut':j selection circuit and -U, which outputs the intermediate value from among the three signals as the 4-j signal as the turbine load I/gus valve open 1 dust request signal 7)
A nuclear reactor that is uniquely equipped with a zero-rated output control device.