JPS59132390A - Method of monitoring and controlling reactor - 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] [Substantive Field of the Invention] The invention relates to a method for monitoring and controlling a nuclear reactor (1) in which a nuclear reactor is operated at one time.

[Keyu's origins of invention and its problems]

General (In the watercolor reactor, as shown in Figure 1, around the visiting cross-shaped 1lI1111Iv/l volume 1 (24 fuel product combinations 2 are arranged and Yuko Hijiri 3 is 4j4 formation) The premature death grid 3 with
They are arranged in two reactor cores 4 whose planar shape is almost circular (2), and these cores 4 are housed in two reactor pressure vessels (2) as shown in Figure 3. The first part of Figure 11 shows one fuel assembly 2, and the large white circle shows the control rod 1. Also, inside such a reactor core 4 (the second part shows a large number of power range neutron detectors 5 (hereinafter referred to as PRM Houdaseki and Nazu)
is provided. Note that this pRm ejector 5 is shown by a small black circle in Fig. S2 and Fig. 3 (2).

These PRfvl detectors 5 are arranged in a planar manner (as shown in FIG.
As shown in Fig. 3, every two rods of the control rod 1 are arranged in a lattice pattern (the two rods are directly connected to each other). The outputs from these pRmH outputs 5 and 5 are processed by the average power/singing range monitor (APRIVI) to detect the average power of the entire reactor core 4, and the local power/singing range monitor In the system (LPRM), a no-phrase-like output is detected.

Then, it is determined that the local output of the control rod 1 is being pulled out (2), and that the local output of the control rod 1 is being pulled out (2). 1l of rl
If the setting value for preventing the withdrawal of the control rod l on the IIJ side is exceeded (- means that a control rod withdrawal monitoring device 6 is installed that prevents the withdrawal of the control rod l to ensure the integrity of the reactor. For example, when the control rod l' at the shaded position in FIG. A group of PRM detectors 5 is selected, and this group of PRM detectors 5 constitutes a local power area monitoring system for monitoring the @urban power around this control rod 1'.

By the way, for the purpose of shortening the operation time of the future nuclear reactor (2nd place, city 1), it will be possible to simultaneously use multiple sticks (
It is also possible to do two operations. In this case, as described above, simply monitoring the control rod withdrawal prevention set value for each control rod (2) is not sufficient, for example, if four control rods are simultaneously Even if one control rod remains in the reactor core without being withdrawn, it will not be detected (2) the control rod withdrawal will continue, and later (2) the remaining control rods will fall rapidly (2). It is conceivable that a sudden reaction error may be inserted and cause fuel damage.The control rod may remain in the reactor (1) due to interference between the control rod 1 and the fuel assembly 2, etc. It is conceivable that the connecting portion 10 to the control rod driving device 8 comes off.

[Purpose of the invention]

An object of the present invention is to provide a highly reliable nuclear reactor monitoring and control method for detecting control rod operation abnormalities in a control system that operates a plurality of control rods simultaneously.

[Summary of the invention]

The nuclear reactor monitoring and control method of the present invention compares the amount of change in the pitch of the PRM detector around 9 of a plurality of control rods, and constructs a pitch that is different from other pitches. It is characterized by the fact that it simultaneously sends out good news and prevents the extraction of controlled crops.

[@Ming Example]

The monitoring and control method of the present invention will be explained below with reference to Figure 4, which shows the core arrangement of two nuclear reactors. The control rods la, 1b + lc, i are now operated simultaneously.
Once a is selected, those control rods 1a to 1d (two adjacent PRM detectors 5a, 5b, 5c+5d are selected as comparison detectors. Then, these detectors 5
A to 5d are mutually compared based on the amount of change based on the value before the control rod operation.

Now, as shown in FIG. If the side cover of the amount of double-crossing exceeds the set value △h (2 abnormal rounding, an i alarm is issued and the operator (1) is rejected. 1. The standard deviation △h of this deviation is determined by the main light (man's center) as appropriate (two major standard outputs).

In the same non-example, the number of simultaneous operation secondary (If41 bullets) was set to 4, but the application of the present invention is based on this controlled number (-in limited cases, Detector for use?/) Selection (- Even if it flashes, it looks like a non-example (except for the PRM detectors 5a to 5d, which instantaneously contact the two-proportion extractor) (Two, like the conventional control rod withdrawal monitoring device (two operations l1111) on the stick.

Of course, it is also possible to combine it with a PRM detector for all directions including the downward direction.

〔Effect of the invention〕

As mentioned above, according to the invention (2), it is possible to compare the amount of change in the PR1R1 ratio detector of multiple pull-out # rods that are operated simultaneously (2), and to detect abnormalities such as operation congestion. control rods, and more reliable control operations (monitoring the control rods and preventing control rod withdrawal if necessary).
We can do something to improve the safety of nuclear reactors.

[Brief explanation of drawings]

Figure 1 is the main configuration diagram showing the relationship between the fuel assembly and the RJIJ control rod, and Figure 2 is the reactor IL? 3 is a vertical cross-sectional view of the core of a nuclear reactor, and FIG. Figure 5 is monitoring of non-invention '+ilJ
FIG. 3 is a detection diagram showing the operation of the control method. 1... Control 1lII power 2... Fuel assembly 3... Unit lattice 4... Octopus core 5... PR
M detector 1a+ 1bl let ld-...Simultaneous operation'1υri Omari 5a, 5'bl 5c, 5d...Selected circle LiVl detector Fig. 3 Fig. 4 Fig. 5 Fig. 1 Interval

Claims (1)

[Claims] Operation in which multiple 71jlJ rods are operated at the same time (2nd, check the amount of change in the reading of the neutron 8'1' thread of the 1ilJ1 wholesale Azusaashi, and in the ml of the neutron instrumentation system A nuclear reactor monitoring and control method that includes 29 points: if there is one with a different amount of change in reading compared to the others (2. - η signal is emitted and the operation is blocked).