JP2582911B2 - Boot area monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention is to monitor and control the operating state of a nuclear reactor at the time of starting operation of a nuclear reactor, and to maintain safety. In addition, one neutron detector uses the principle reactor power from the neutron source region to the intermediate power region (approximately 10
Digit) is monitored.

(Prior Art) Conventionally, as a monitoring device for monitoring neutrons of a nuclear reactor, its measurement range is over 10 digits, so as shown in FIG. 8, in a neutron source region having a low neutron flux level at startup, A neutron source monitoring device (hereinafter abbreviated as SRM) is used, an intermediate region monitoring device (hereinafter abbreviated as IRM) is used in an intermediate output region where the neutron flux level is high at the time of startup, and an output region monitoring device (hereinafter abbreviated as IRM) is used during operation. PRM).

FIG. 4 is a block diagram showing the configuration of the IRM. IRM
Installs a neutron detector 2 in a nuclear reactor 1 on site, guides a neutron flux signal (electric signal) from the detector 2 to a central operation room via a cable 3, and a predetermined attenuation rate by an attenuator 3. After the attenuation, the reactor output corresponding to the neutron flux signal is obtained by the IRM measuring unit 5 and the reactor output is displayed and recorded on the instruction / recorder 7 on the operation panel 6. Note that the attenuation rate of the attenuator 4 is changed by switching the range switch 8 on the operation panel 6. Accordingly, the operator checks the output of the indicator / recorder 7 while checking the output of the reactor 1.
In general, since the indicator of the indicator / recorder 7 is a linear scale, when the indicator approaches full scale, the operator raises the range of the range switch 8 by one step to increase the attenuation rate of the attenuator 4. To increase. When the reactor power increases until the maximum range of the range switch 8 is used, the operator switches the mode of the reactor from “start” to “operation” at an appropriate time, and shifts to the operation monitoring of the reactor by the PRM. I do.

By the way, as described above, conventionally, SRM is used in the neutron source region where the neutron flux level is low when the reactor is started, and IRM is used in the intermediate power region where the neutron flux level is high.
However, since SRM and IRM are separate devices, the output to the indicator / recorder etc. differs between the two devices, and adjustment, calibration, alarm setting at the time of trip, etc. must be performed for each device, so that it is practical Above was very complicated. Therefore, a start-up area monitoring device (hereinafter abbreviated as SRNM) that can monitor about 10 digits of reactor power over a wide area from the neutron source area to the intermediate output area at the time of startup with one piece of hardware has been developed. It is being introduced into plants.

FIG. 5 is a block diagram showing the configuration of the SRNM. The neutron flux signal from the neutron detector 2 in the reactor 1 is input to the SRNM measuring unit 9 via the cable 3 and the SRNM measuring unit 9 The neutron flux signal is converted into a reactor power of about 10 digits using a microcomputer or the like, and this reactor power is indicated on a logarithmic scale by an indicator / recorder 7 on an operation panel 6.
The operator performs a reactor start-up operation while checking the output of the indicator / recorder 7, and switches the mode of the reactor from "startup" to "operation" when an appropriate output is obtained. Therefore, compared to the case where the SRM and the IRM are used, it is practical and less complicated, and the range switching operation required for the IRM or the like is not required, and the burden on the operator is reduced.

(Problems to be Solved by the Invention) However, the above-mentioned conventional SRNM also has the following problems. That is, when the mode of the reactor is switched from “startup” to “operation”, when the IRM is used, the operator can confirm that the mode switching time is approaching by switching the range switch 8 to the highest range.
When the NM is used, the switching timing can be measured only by the output contents of the instruction / recorder 7. Therefore, since the operator keeps monitoring the output of the indicator / recorder 7 from the initial stage of the start-up, the operator does not notice that the mode switching time is approaching. Could cause abnormalities. In particular, when a reactor power plant is replaced from SRM / IRM to SRNM as a monitoring device at the time of start-up, the operator of the plant is accustomed to performing the reactor start-up operation while performing range switching. Since the reactor start operation was performed at intervals, the possibility of operation errors such as forgetting to switch modes was high.

Therefore, the present invention provides a method of displaying the information corresponding to the range of the SRM or the IRM from the “start” mode to the “operation”
An object of the present invention is to provide a start-up area monitoring device (SRNM) that can clearly indicate that the mode switching time to the mode is approaching, prevents an operator from forgetting to switch the mode, and improves safety.

[Constitution of the Invention] (Means for Solving the Problems) The present invention obtains a reactor power in a neutron source region and an intermediate power region based on a neutron flux signal from a neutron detector placed in a reactor, In the start-up area monitoring device (SRNM) that outputs to the reactor power recorder on the operation panel, a series of range data is set and stored in order from the low-power division range that divides the reactor power range for the neutron source area and the intermediate output area A range table, range data reading means for reading range data corresponding to the reactor output obtained from the neutron flux signal from the neutron detector from the range table, and displaying the range data read by the reading means. And a range data display means for outputting.

(Operation) By taking such means, the range data displayed as the reactor power obtained by the neutron flux signal from the neutron detector increases increases. Therefore, when the displayed range data reaches the highest range, the operator can recognize that the time to switch the mode of the reactor from “startup” to “operation” is approaching.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the present embodiment. The same parts as those in FIG. 5 are denoted by the same reference numerals, and detailed description is omitted. In FIG. 1, reference numeral 10 denotes an SRNM measuring unit 9
Is a range judging unit for judging to which range in the conventional SRM and IRM the reactor power value obtained in the above is. The judgment result of this judging unit 10 is provided on the operation panel 6. Displayed and output on the range display 11. Reference numeral 12 denotes a maximum range detection unit that detects that the maximum range of the SRM / IRM equivalent range determined by the range determination unit 10 has been reached.
The buzzer 13 provided on the operation panel 6 sounds according to the detection signal of the detection unit 12.

As shown in FIG. 2, the range determination unit 10 receives a nuclear power output signal from the SRNM measurement unit 9 and outputs it to the indicator recorder 7, a reactor signal input unit 21, and a 10-digit reactor output in the start-up area. The range is divided into 10 units, one digit at a time, and "01" is equivalent to the range used in conventional SRM / IRM in order from the low output range
A range table 22 for setting and storing a series of range data corresponding to ~ 10, a reactor output signal input to the reactor signal input unit 21 is taken in at a constant period, and a corresponding reactor output is output from the range table 22. And a range signal output unit 24 that outputs the range data read by the range reading unit 23 to the range display 11 and the highest range detecting unit 12. .

In the operation of the present embodiment configured as described above, when the reactor 1 starts the start-up operation, the neutron flux is detected by the neutron detector 2 in the reactor, and the neutron flux signal is output to the reactor output by the SRNM measurement unit 9. The converted value is provided to the indicator / recorder 7 of the operation panel 6 via the reactor signal input unit 21 of the range determination unit 10, and the reactor output is indicated and recorded on a logarithmic scale.

On the other hand, the reactor output signal input to the reactor signal input unit 21 is taken into the range reading unit 23 at a constant period, and the range reading unit 23 reads the range data corresponding to the corresponding reactor output from the range table 22. You. The range data is output to the range display 11 by the range signal output unit 24.
Is output to the highest range detector 12. As a result, the range display section 11 displays a numerical value corresponding to the corresponding range data. In addition, in the highest range detection unit 12, a detection signal is not output unless the corresponding range data is in the highest range.In this case, the buzzer 13 does not sound, but when the maximum range is reached, a detection signal is output and the buzzer 13 is output. Sounds to alert the operator that the maximum range has been reached.

Reactor power is “10 ^-8 ” or less at the beginning of startup, but it gradually rises and then approaches “1”, and the mode is switched from “start” to “operation”, and the monitoring system is also switched from SRNM to PR.
Move to M. That is, the display of the range indicator 11 is “01” at the initial stage of the start-up, and thereafter becomes larger as “02”, “03”... As the reactor power increases, and the switching to the “operation” mode is almost completed. In the range of "10 ^-1 ""1", the highest range is "10". Therefore, the operator visually recognizes the display on the range display 11 and confirms that the display has reached the maximum range of “10”, which indicates that the time for mode switching from the “start” mode to the “operation” mode is approaching. Can be recognized. Therefore, the mode switching timing is not forgotten, and there is no possibility that the switching to the “operation” mode is delayed and the reactor 1 becomes abnormal, thereby improving safety. In particular, since the display of the range indicator 11 corresponds to the switching operation of the range switch 8 for an operator who is accustomed to the conventional SRM / IRM, when operating the conventional SRNM which measures the mode switching timing by the output of the indicator / recorder 7 There is no uncomfortable feeling as compared with the above, and there is no possibility of making a mistake such as forgetting to switch modes.

Further, according to the present embodiment, the buzzer 13 sounds when the highest range is reached, so that even an operator who has missed the display of the range display 11 can be notified from hearing that the mode switching time is approaching, Be clearer.

It should be noted that the effects of the present invention can be sufficiently achieved even if the highest range detection unit 12 and the buzzer 13 are omitted.

[Effects of the Invention] As described above in detail, according to the present invention, SRM or IRM
By displaying the information corresponding to the range, it is possible to clarify that the mode switching time from the "start" mode to the "operation" mode is approaching, and it is possible to prevent the operator from forgetting to switch the mode and improve the safety. A boot area monitoring device (SRNM) can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of an embodiment of the present invention, FIG. 2 is a block configuration diagram of a range determining unit in the embodiment, and FIG. 3 shows a correspondence relationship between a reactor output and each monitoring device. FIG. 4 is a block diagram of a conventional IRM, and FIG.
The figure is a block diagram of a conventional SRNM. 1 ... Reactor, 2 ... Neutron detector, 6 ... Operation panel, 7 ... Indicator / recorder, 9 ... SRNM measurement unit, 10 ... Range judgment unit, 11 ... Rench indicator, 12 ... ... Highest range detector, 13 ... Buzzer, 21 ... Reactor signal input, 22 ...
Range table, 23: Range readout unit, 24: Range signal output unit.

Claims (1)

(57) [Claims] 1. A starting device for obtaining reactor power in a neutron source region and an intermediate power region based on a neutron flux signal from a neutron detector placed in a reactor, and outputting the reactor power to a reactor power recorder on an operation panel. In the region monitoring device, a range table for setting and storing a series of range data in order from the low power division range by dividing the reactor power range with respect to the neutron source region and the intermediate power region, and from the range table to the neutron detector. Range data reading means for reading range data corresponding to the reactor output obtained by the neutron flux signal; and range data display means for displaying and outputting the range data read by the reading means. Boot area monitoring device.