JPS61155893A - Indicator for position of control rod - 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 Technical Field of C* Ming] The present invention relates to a control rod position indicating device suitable for monitoring the position of control rods in a nuclear power plant.

[Technical background of the invention and its problems] The prior art will be explained with reference to FIGS. 2, 3, and 4. The following description will be made using a BUR type nuclear power plant as an example, but it goes without saying that the present invention is not limited to this.

A conventional control rod position indicating device is constructed as shown in FIG. The control rod position is detected by 53 or 54 reed switches built into the main body of the control rod 1 and attached corresponding to the insertion position of the control rod 1 into the reactor.

These switches are arranged at each intersection of the matrix circuit shown in FIG. 3 that constitutes the control rod position detector 10 provided for each control rod, and the data P representing the control rod position is P= (Pi (PIP2P3P4P3. P8P72°
2°1"°1"r)) i=・～・(・8 control rod's mound υ
For example, 0 is input to the control rod position input device 2 in the form of (hereinafter collectively referred to as control rod position data).

When the first control rod position is at the 00'' position, the reed switch “00” in FIG. 3 is closed, P6 and Pl are connected to each other, and a switching circuit (not shown) connected to the outside As a result, the signal state of P g eP x becomes “1”, and the position data P becomes P=Pt(10000e100000
), this data P is internal processing data [Pl([
Pl indicates data after conversion of data P),
Control rod position determination device! 3 is input. The control rod position determination device 3 determines whether the input data [Pl is normal data or not. In a normal state, only one of P1 to Ps is "1" and only one of Ps to Ptt is 1.
′′, and other combinations result in abnormal data.

There is data [P] that does not satisfy this condition.

If there is even one of i=1=n (n: number of control rods), a control rod position device abnormality signal a is output, and control rod operation is disabled. Further, the data CP] is input to and stored in the control rod position storage l output device 4, and is outputted to the outside in the form of control rod position output data B shown below.

(B = (b 1(xoxtxzxs*yoyxyz
ys10002υJ, TOTIT2#here.

1 (=1~n) 2 Control rod number Xo""X3: X coordinate of control rod i (see Figure 4) yo"
ya: y-coordinate of control rod i (see Figure 4) υo”lJ3:
Control rod i digit W1 data To=Tz: Control rod i digit!
! 10th data R1: Selection of control rod i Ol: Full withdrawal of control rod i Ii: All insertion ports i of control rod i: Drift of control rod i Ti: Overtravel of control rod i For example, when control rod i=1 If the control rod position is selected at the fully withdrawn position, the data B is B = b 1 (001G, 0000,0001,00
1,1,1,0,0,0).

As described above, in the conventional control rod position indicating device, the control rod 1
If there was an abnormality in the position data P from the control rod position determining device 3, the control rod position indicating device abnormality signal a was output and control rod operation was prohibited. This poses a major problem during the operation of the nuclear power plant, especially when the output fluctuates, and only the abnormal position state is input to the control rod position memory/output device 4, making the control rod position unknown.

[Object of the Invention] The present invention provides a control rod that enables control rod operation in the case of a single failure in control rod position data and prevents one position from becoming unknown, thereby improving the operability and operating rate of a nuclear power plant. The purpose of the present invention is to provide a position pointing device.

[Summary of the Invention] For this reason, the present invention provides two sets of control rod position data processing systems, checks the normality of each position data, and allows control rod operation as long as even one set is normal. By outputting the position data of the normal one through the controller, the loss of position data is prevented, and if both sets become abnormal, control rod operation is prohibited to ensure safety.
A feature of this system is that control rods with abnormal data are displayed.

[Embodiment of the Invention] FIG. 1 shows a configuration diagram of a control rod position indicating device according to an embodiment of the present invention.

The control rod position indicating device of this embodiment has a matrix circuit shown in FIG. 3, and has control rod position data P1. Two sets of control rod position detectors 10 that output P2 and their control rod position data P1 are input and converted to internal processing data [P1], or control rod position data P2 is input and converted to internal processing data CP2]. Two sets of control rod position input bags to be converted M2
Then, input the control rod position data [P sl , [P 2], determine whether there is an abnormality in the position data, and if there is a data abnormality in even one of the 0 control rods.

Control rod position indicating device abnormality signal a1 or B2.

Control rod position abnormality signal 81 corresponding to the relevant abnormal control rod
Alternatively, output e 2 and output 1 position data [P 1
], CP2] to the control rod position memory/output bag W14, and the control rod position indicating device abnormality signals a1, a2 are input, and both at and ax are input. When "l", the control rod position indicating device abnormality signal a is output to the outside and control rod operation is prohibited, while the signal at,
When only one of a2 is 1, the control rod position abnormality determination device 15 outputs the control rod position data output switching signal C, and the control rod position data CP t ] or [P2] is input, and the control rod position output data B1 or B2. Control rod coordinate L1
Alternatively, two sets of control rod position storage/output devices 4 that output B2 and control rod position output data B1#B2 are input, and the control rod position data output switching signal C from the control rod position abnormality determination device 5 is used. , a control rod position data output switching device that switches the above two signals and outputs them as control rod position output data B! 6, and an abnormal control rod display bag [7] that inputs the control rod position abnormality signal 81°e2 and its control rod coordinates L 1t L 2 and displays an abnormal control rod. Here, L 1 # L 2 is represented by.

however.

1 (=1 to n) 2 Control rod number K O"" If bar i is i=+, its coordinates are (4,0) coordinates from Figure 4, so L L is L 5=Ls
It is indicated by (0010,0000).

With the above configuration, now the position data Pt from the control rod 1,
When there is no abnormality in both F'2, the control rod position judgment bag 5!3 outputs the signals a t=o, az=o, e s=0
．． Output ez=o, respectively. Control rod position determination bag! 15
from the signals at, a2, C:, =C(a I.

a2) Outputs C(0,0) to the control rod position data output switching circuit 6 and outputs a=0 to permit control rod operation (permitted when a=0), control rod position data output switching When circuit 6 inputs 0=C:(0,0).

Output control rod position data with B = 81.
Also, control rod position memory/output bag! ! 4 is control rod seat #AL
Outputs s, L 2. Abnormal control rod display bag [7 is signal 6 s = 0. eh 2:01 L, s *L
2 for control rod coordinate L1.

e Since 1 = 0, the position of the control rod coordinate L1 is assumed to be normal, and no abnormality display is performed.L's Also, since 82 = 0 for B2, the position of the control rod coordinate L2 is It is assumed to be normal and no abnormality is displayed.

On the other hand, if a data abnormality occurs in the position data P1, for example, 1 = 10th data is the control rod insertion position "00".
, then P = P t .

(10000, 100000) is normal data, but
If P = = P plate o (10010, 100000) “1
There are too many °9s, resulting in abnormal data, but like this, for example 1 =
Assuming that there is an abnormality in the 10th data, control rod position judgment bag [13 is al=1 (“1” indicates abnormality),
While outputting az=O, for the 10th control rod,
e t = 1 ('1' indicates abnormality).The control rod position abnormality determination device 5 outputs the signal a1°B2 to 0=C:
(1,0) is a control rod position data output switching device! 6 and output a=0.

Allow control rod operation. When the control rod position data output switching device 6 receives e=c(1,0), it sets B=82 and outputs the control rod position data.

The abnormality control rod display device shows e for the 10th control rod.
1 = 1 and the control rod coordinates L (L I = L Io (1010° 1000), that is, the coordinates (5, 1) of the 10th control rod) are input from the control rod position memory l output device 4, and the ki side 0 position data P that displays the position abnormality of the 10th control rod
There is a data error in 2.

For example, assuming that there is an abnormality in the i=5th control rod data, the control rod position judgment bag! ! 3 are respectively at=0 and a2
= 1 and e 2 for the 5th control rod.
=1 is output. The control rod position abnormality determination device 15 receives the signal a
From t and a2, e=C(0,1) is output to the control rod position data output switching device, and a=0 is output to permit control rod operation. Control position data output switching device 1!6
When inputting e=c(0,1), B=81 is set and control rod position data is output.

Abnormal control rod display device! 7 is e for the fifth control rod
2=1 and control rod position memory/output device! ! Input the control rod coordinates Lz (Lz=Ls(0001°0000), that is, the seat 1m (8,0) of the fifth control rod) from 4, and set 5 on the -2 side.
The control rod position error will be displayed.

If there is an abnormality in the data for both position data Ps*Px, then 1. For example, assuming that there is an abnormality in the data of the first control rod on the Pi side and the third control rod on the P2 side, the control rod position determination device 13 will each calculate a1= 1. While outputting a==1,
P ex=1 for the first control rod on the s side. Output e 2 = 1 to the third control rod on the Pz side. The control rod position abnormality determination device 15 determines e=c(1,
1) is output to the control rod position data output switching device 6, and a=1 is output, thereby prohibiting control rod operation.

Control rod position data output switching bag! I6 relates to abnormal control rod data when inputting c==c, <1°1).

Outputs Bi=0. Abnormal control rod display bag! 7 is.

e1=1 for the first control rod on the Pi side and Lt=Lt(0001,00
00) to display the abnormal position of the 1st control rod on the &1 side, and e2= for the 3rd control rod on the P2 side.
1 and the control rod position memory/output device 14, 2 =
Input L s (0110, 0000) and 3 on &2 side
No. control rod position error display.

Although the above embodiment was explained using a BwR type nuclear power plant, it goes without saying that it can also be applied to nuclear power plants such as FBR and ATR. Although this is done using a reed switch, other means are also applicable. Furthermore, it goes without saying that the CHD drive mechanism may be of a hydraulic drive type, a motor drive type, or the like. Furthermore, it goes without saying that any display method such as an individual display using an LHD or the like or a display using a CRT can be applied to the display and display method of the abnormality control rod display device.

[Effects of the Invention] As described above, according to the present invention, in the case of a single failure in the control rod position data, the control rod can be operated and the position can be determined, and the control rod position of the single failure is also displayed. Improving the operability and availability of nuclear power plants.

A control rod position indicating device with high reliability and safety can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a control rod position indicating device according to an embodiment of the present invention, Fig. 2 is a block diagram of a conventional control rod position indicating device, and Fig. 3 is a block diagram of a control rod position indicating device. The constituent matrix circuit diagram, FIG. 4, is a coordinate correspondence diagram of the control rods arranged in the nuclear reactor. 1... Control rod, 2... Control rod position input device. 3... Control rod position determination device, 4... Control rod position memory/output device, 5... Control rod position abnormality determination device. 6... Control rod position data output switching device, 7... Abnormal control rod display device. Agent Patent Attorney Crest 1) Makoto ゛) Figure 1 Figure 3

Claims (1)

[Claims] Two sets of control rod position detectors that detect the insertion and withdrawal positions of control rods placed in the reactor, and two sets of control rod position detectors that input control rod position data from these two sets of detectors and convert it into internal processing data.
a set of control rod position input devices, and two sets of control rod position determination devices that determine whether or not there is an abnormality in the internally processed data and output a data abnormality signal and a control rod position indicating device abnormality signal in the case of an abnormality; a control rod position abnormality determination device that outputs a position data output switching signal when only one set of control rod position indicating device abnormal signals is abnormal, and outputs a control rod operation prohibition signal when both sets are abnormal; Stores internally processed data and outputs position data and control rod coordinates to the outside 2
a set of control rod position storage/output devices; a control rod position data output switching device that inputs the position data and switches the position data to be output based on the position data output switching signal; and a control rod position determination device of the two sets. A control rod characterized in that it is equipped with an abnormal control rod display device that inputs a data abnormality signal from the device and control rod coordinates from the two sets of control rod position storage/output devices, and displays an abnormal control rod. Position indicating device.