JPS6276493A - Scram discharge system controller for control rod drive - 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 the Invention] The present invention is installed in a nuclear power plant! ! , 111
This article relates to a scrum fJI system control device with a 3+1 dedicated drive device.

[Technical aspects of the invention and its problems] For example, the high 1F water-driven type that uses reactor water is used to drive the control rods of boiling water reactors. This drive water pressure is controlled by control rod drive control units 1 to 2 (it CtJ).
11, and the drain from each -L unit I~ is supplied to the scram drainage system control til+ device9.In the scram 1/1 discharge system control device, the water level is monitored, for example, if there is too much drain water. If there is any slippage in the control support, set the reactor scram to 4.

Scram discharge system of such a control rod drive device1. Control equipment (Generally, as shown in Figure 3, connect the scram discharge vessel 1 and the reactor equipment drain limp 2!, '1, and install the drain pipe ↑4 in the drain piping 3), and in the scram The discharge unit 1 is equipped with a water (Q detection level switch +6.7). 2
Water level detection level switch F6+; ;J For communication, a third water (1"l detection level switch f7f and 1 level for scram detection is installed respectively.

Therefore, the level O62 of the scram discharge container combiner 1 is f-jl due to the increase in the water level δ1 due to high-refined hemp, and the level and Ijj signal b used for the inter-
It is configured with 1/2x2 logic or 2/3 logic.

Drain water accumulated in the scram discharge container 1 is drained from the drain pipe 3
J3 J: Drain valve 4 between Bibatake and I! is accommodated in IJi 7 furnace equipment drain valve 2 by the action of one CΦ horn.

% J3, a vent valve 8 is usually used to aid in the smooth discharge of drain water from the scram discharge vessel 1.

This J is like an eel! S'F-r control device scram; Sea 1~leak from valve 711, handling of control 211 system, In water discharged by insertion, 1g of water accumulated in scram discharge container 1 for a certain amount of fi1, The water level of the drain water has risen and the level switch 5 is turned on.
Control rod pull 1M and 11 stops (through 1g) by 6,
Furthermore, as a result of water level detection by level switch f-7, there is a space of 1J in container 1, which corresponds to the discharge δf- during scram.
4' It seems that the nuclear power plant will be scrammed before it reaches 4'.

Location C, drain pipe 3 is clogged] Upward, J, closed '%
(,' or if a 1-hera pull occurs such as the drain valve 4 becoming closed due to failure, the sukrano\111
There is a possibility that the drain water in the Dekichi vessel 1 will not be discharged and the water level of the drain water will rise by 1-47Il. Even in such a case, the level switch is activated and scrams the reactor.In 4F and 41, even though the control rod drive device is wired, it is determined that there is an abnormality, and it takes extra effort to find out. It will cost 7.

In this way, a reactor scram can be avoided when trouble occurs due to blockages in the drain valve 4 and drain piping 3, and the
Improving the JJ rate Improvements that would reduce the number of trips required during driving have been desired, but have not been put to practical use to date.

[target of invention]

The present invention has been made in view of the above-mentioned points. C. If the drain piping or drain valve is malfunctioning, the drain water can be discharged from the scram discharge container via another route such as the drain piping of B. The scram IJI +11 system control system of the control rod drive device that prevents the scram I
l (with the purpose of

(Summary of the invention) The present invention provides a branch pipe in parallel with the drain pipe connecting the scram discharge container and the D; Controlled by detecting the δ device (, attached) =
)Yo) IL, 1. , C is said to be a symptom of 1Jj.

(An example of a thick difference between A and A) Hereinafter, one embodiment of the present invention is shown in Fig. 1 and b, and Fig. 2 is shown in 8.
5, the conventional RANOTO 111-4 components (141, using the same number as in FIG. According to Fig. 1, in 1), the distillation side part of the drain valve 11 of the drain pipe T"
Install 104 branch pipes that connect to the furnace equipment drain limp 2. There is. Hereinafter, the standby drain valve 11 on the L flow side will be referred to as the standby drain first valve 1.
・Standby drain on the downstream side? 12 is the special drain second valve.
cormorant. A cleaning water source 13 is communicated between each of the standby drain valves 11 and 12, and one end of a pipe 14 is connected to the pipe 14, and a valve 15 for flushing the cleaning water (hereinafter referred to as a cleaning port) is installed in the piping 14.
I'm J.

Figure 2 Li each valve 11, 12, 15 control system 211 @
This is a family tree.

Yoza, switching of the water shuttle, i.e., 71shi↑j1 exit-]
(If the drain piping 3 is malfunctioning 11, the JJI output from the scram discharge container 1 will be caused by the Vj PM, -CU) l) When replacing the Vj with the branch piping 10 (
,321+11 Rir.

<K t33.29 is an IS reactor scram 11. ) is closed, normally maintained in the open state.

1: Drain valve 4 is open, drain pipe 3 is blocked, etc., and drain 11 [unable to drain]
h+'11 water 11'! Of the detection level switches, 4 detections of impossibility of launching) JI IlrufH/IJ level switch 5
) turns on, the interlocking switch! j' becomes ON,
1! 1 machine drain 1'1 valve 11 memeta b, I heard. At the same time, at 11'i, the relay 23 is set to 1+tab, and the self-holding is applied to the self-holding relay switch 23a of the GIJ level switch 5, and the Samurai 1 drain second valve 12 is activated. become a rumor.

As a result, the drain water from the JJI outlet vessel 1 passes through the branch pipe 10 and is sent to the reactor equipment drain limb 2.

Next, we will explain the cleaning action of the 1 blue machine line. 1J 3° distribution? The switch operation 41' is installed in T14 (the flush valve 15 is
k2J, Inter [ ] Tsuku listening to Riwashiban 15 is 1.
QC has been carried out.

That is, when the level switch is OFF with the water level in the scram leveling container 1 being low, cleaning 4? When the open signal 1 (5) is output, the operation switch 20 turns ON, and the tie ζ 221 that determines J, ℃ and cleaning time is energized, and the contact 21 EJ turns ON (f1, so1). When the cleaning valve P15 is activated, the relay 2 knee j is energized.As a result, the relay contact 22[) becomes 01-'l'', and the relay 23 is temporarily moved to the stationary u1. +j
, +23 a is 0[F and the standby drain valve 11.
121.1-Fl is fully open.

IcJ3, IE+,', Mi21r] maintains the IJ ON state during the cleaning 01 even if the timer 21 is not energized.

However, the encouragement of relay 22 (18 Tei 22a turned ON at the meeting)
Contacts 2a and 27 of the relay 27 that turns off the cleaning process
1, 2nd valve for standby drain 11.12
Opening/closing control is performed at 11.

(, 5 (The opening/closing control action of the drain first and second valves 11.12 is as follows. Start counting. Until it reaches setting 11.1, the contact 26 of the tie 726 is OFF. Therefore, the relay 27 is still not energized, so the relay 27 is not energized.
AND of the closing contact 271) of the relay 22 and the contact point 22a of the relay 22
I heard that the 3rd machine drain valve 11 is fcj, scram IJI exit Ai! ! The +1 side piping 1Qa is cleaned. , J, 3.1 The piping 10b on the non-build side is fully open because the contact point 27a of the relay 27 is at the OF'i'' position.

When the fin contact 26a reaches the set time and the fin contact 26a turns ON, the relay 27 is activated and installed in the second standby drain valve 12.
a/fi turned on and the standby drain No. 2 block? 12 will be heard. At the same time, the relay contact 27 b h < 0, which is built into the first standby drain valve 11, roars and the first standby drain valve 11 closes.

As a result, the pipe 10 on the drain inosive 2 side is cleaned. During this process, the pipe 10 is cleaned I1. ? 17
! When timer 28, which is set to 1, times up η, timer Ia point 28b turns OFF, and timer 2G becomes de-energized. Relay contact 27a is 01
: "The second standby drain valve 12 closes. On the other hand, the timer 21 which sets the cleaning period (0) is closed.
21 a-t) OF t- yell, wash mouth, butt to 1
When the relay (221) claw (which was interlocked) is energized (41), the cleaning process is completed.

In addition, 24.25 in Fig. 2 is a switch for constant stop (during operation), and 1 is a switch that is always in the ON state (the sumo wrestler of the invention). For piping＼)
9 rows of branch pipes were installed, and the drain valve installed in the branch pipe was connected to the drain pipe according to the detection signal of the detection device installed in the drain container. Even if a trouble such as a blockage occurs, the drain water (Q) in the drain container rises, and the detection device detects a drain malfunction in the 1st line, the reactor must be scrammed. IJI exits to the equipment drain reservoir, thus reducing the space required for the control rod drive scram.
The number of situations in which IS was required to be completed or scrammed has been significantly reduced, and improvements in the operating rate and operation of Plan 1~ have been achieved. φλL] 4゜ to reduce the number of f1 wrestlers to 11゜

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the scram 77) yarn output control device of the control illumination + rod drive device according to the present invention. System diagram(
·be. 1... Scram l Jr discharge container, 2... Nuclear reactor tank drain lean! , 3... Drain piping, 4... Drain 5t, 5゜6.7... Level switch, 10... Branch piping, 11... Standby drain 1st button, ] 2... Standby drain Second valve, 14...Piping, 15...Washing valve. Applicant's agent Hisashi Hatano L l Figure

Claims (1)

[Claims] A drain valve is installed in the drain piping connecting the scram discharge container and the reactor instrument drain sump, and a detection device is installed in the scram discharge container to detect the water level of drain water, and the reactor is scrammed according to the drain water level. In the scram ejection system control device of the control rod drive device,
A branch pipe is provided that connects the distillation side of the drain valve of the drain pipe and the drain lip of the reactor equipment, and a standby drain valve provided in the branch pipe is opened and closed in response to a detection signal from a detection device. scram ejection system control device for the control rod drive device.