JPH10296006A - Device for filing instrumentation piping with water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a large amount of dearerated water easily and realize the shortening of time and the operating reliability of operation to fill an instrumentation piping with water. SOLUTION: An air permeable membrane 22 is provided horizontally in a casing 29, then a water chamber 20 is formed below the air permeable membrane 22 and an air chamber 23 is formed above the air permeable membrane 22. In addition, baffles 21 are provided in a zigzag fashion in the water chamber 20 so that the water flow meanders. A vacuum pump 24 which vacuumizes the interior of the air chamber 23 is firmly mounted on the casing 29. A water outlet side plug 27 and a water inlet side plug 28 are provided in the water chamber 20, and water is continuously flowed into the water chamber 20. The water infiltrating into the water chamber 20 from the inlet side meanders up and down, flowing out of the outlet side. Thus it is possible to obtain a large amount to the deareated water easily and thereby shorten the time required for the operation to fill the instrumentation piping with water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrumentation pipe filling apparatus used for filling water into pipes of power plants, general equipment plants, factories, and the like.

[0002]

2. Description of the Related Art In general, when measuring the pressure or water level of a pipe or a container filled with water or steam, an instrumentation pipe for guiding pressure or a differential pressure to an instrument is filled with water, called "water filling." .
As a water filling device, there is a hand pump or an electric pump, and water is filled by pushing water stored in a tank from a meter side to a pipe side using the pump.

[0003] Taking the reactor water level measurement at a nuclear power plant as an example, the instrumentation piping configuration and a conventional water filling method will be described with reference to Figs. In FIG. 2, the reactor water level is measured by a reactor pressure vessel 1, a differential pressure gauge 2 for measuring the reactor water level, and an instrumentation pipe 3 for guiding the reactor head water pressure to the high pressure side of the differential pressure gauge 2. And an instrumentation pipe 3a for guiding the head pressure of the reference water level on the reference container 4 side to the low pressure side of the differential pressure gauge 2, and drain pipes 6 and 6a for draining water from the instrumentation pipes 3 and 3a to the funnel 5. There is.

The drain pipes 6 and 6a are connected to a drain header 6b.
And are connected to the funnel 5 via the stop valve 7. In the instrumentation pipes 3 and 3a, detection source valves 8 and 8a are provided on the reactor pressure vessel 1 side, and instrument inlet valves 9 and 9a are provided on the differential pressure gauge 2 side. Drain valves 10 and 10a are provided in the drain pipes 6 and 6a. Provided,
A hose 11 is externally provided on the differential pressure gauge 2 side of the drain header 6b.
A connection port 12 for connecting the like is provided.

[0005] A water filling method will be described using the instrumentation pipe 3a as an example. A method in which a hand pump 13 or an electric pump 14 is connected to the connection port 12 using a hose 11, and the method is performed using water filled in a tank 15 via a drain header 6b and a drain pipe 6a, and a system for supplying water. 16 to hose 11
There is a method in which the system is connected to the connection port 12 by using the system pressure of the system 16 for replenishing the filling water through the drain pipe 6a and the drain header 6b.

In any case, after the detection source valves 8 and 8 are fully closed, water equivalent to the internal capacity of the instrumentation pipe 3a is pushed in by a pump, and then the detection source valve 8a is fully opened. However, there is a possibility that air may remain in the instrumentation pipe 3a as shown in FIG. 3 as shown in FIG. 3, so that water is further supplied to the hand pump 13 shown in FIG.
Alternatively, water is pushed in by the electric pump 14.

[0007] Since the residual air 17 stays in the inner surface of the instrumentation pipe 3a or in the throttle such as the detection valve 8a, it must be blown using a considerable amount of water. The greater the amount of water to be blown, the higher the reliability of water filling. However, usually, the capacity is about 10 times the capacity of the instrumentation pipe 3a. In addition,
Reference numeral 26 in FIG. 3 indicates a water column equivalent to dissolved air.

[0008] The water-filled water usually contains dissolved air 18 of about 3% by volume. This is a 10mm caliber and a length
In the case of a 10 m instrumentation pipe 3a, it is equivalent to about 30 cm. Degas operation is performed when the reactor is started.

At this time, the dissolved air 18 in the instrumentation pipe 3a escapes, appears as bubbles, and is sucked out to the reactor vessel 1 side. Then, the water filled water in the instrumentation pipe 3a drops the dissolved air equivalent water column 26 that has escaped. This phenomenon appears remarkably in the instrumentation pipe 3a connected to the reference container 4.

As a result, the pressure applied to the low pressure side of the differential pressure gauge 2 decreases and the pressure difference between the high pressure side and the high pressure side decreases, so that the reactor water level appears to rise, and an alarm or an interlock may malfunction. . The fluctuation of the reactor water level during the deaeration operation at the time of starting the reactor is widely known.

Conventionally, in order to prevent this, the water in the instrumentation pipe 3a is heated by storing water in the tank for 24 hours to degas naturally or by circulating and heating the reactor water before the degassing operation. And degas.

[0012]

However, in the case of the hand pump 13, since a method of pushing a small amount of water is used, a flow rate that can sufficiently blow the residual air 17 in the instrumentation pipes 3, 3a cannot be flowed. Further, in the case of the electric pump 14 and the system 16 for supplying the water, the flow rate necessary for blowing the residual air 17 in the instrumentation pipes 3 and 3a can be flowed.

However, in the case of the electric pump 14, air bubbles are generated in the flooded water due to stirring by the blades, and air bubbles are mixed in the system 16 for supplying the flooded water. For this reason, it is necessary to increase the reliability by filling the instrumentation pipes 3 and 3a with water using the respective methods.

In the case of the electric pump 14 or the system 16 for refilling the water, since deaerated water cannot be used as the water, the reactor water is circulated and heated during the deaeration operation at the time of starting the reactor. Then, the temperature of the water in the instrumentation pipes 3, 3a must be raised and degassed.

[0015] Therefore, not only does the water filling take time, which causes an increase in the exposure dose to the workers, but also in a nuclear power plant or the like, the time required for starting the reactor becomes longer or the load on the operators increases. There are issues such as an increase.

The present invention has been made in order to solve the above-mentioned problems, and a large amount of deaerated water can be easily obtained, a flow rate can be obtained by directly using a makeup water system, an instrument can be in service, and instrumentation can be performed. An object of the present invention is to provide an instrumentation piping water filling apparatus capable of shortening the time required for water filling work of a pipe and improving reliability.

[0017]

According to the first aspect of the present invention, there is provided a housing, an air permeable film provided in the housing so as to traverse the housing, and a water chamber provided below the air permeable film. And an air chamber provided above the air permeable membrane, and a water inlet side and water outlet side plug provided in the water chamber.

The invention according to claim 2 is characterized in that a plurality of baffles are provided in a staggered manner in the water chamber from above and below, so that water entering from the inlet of the water chamber meanders up and down and flows to the outlet. I do.

A third aspect of the present invention is characterized in that a vacuum pump is provided which can make a negative pressure by a vacuum pump and reduce the pressure in the air chamber. The invention of claim 4 is characterized in that the casing is installed on a cart with casters.

According to the present invention, it is possible to supply degassed water at a flow rate necessary for blowing residual air in instrumentation pipes and the like when filling instrumentation pipes and the like in power plants, general equipment plants, factories, and the like. it can.

In addition, it is possible to use deaerated water at a flow rate necessary for blowing residual air in the instrumentation pipes and the like for filling the instrumentation pipes and the like, so that highly reliable watering can be easily and reliably performed. It can be carried out.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an instrumentation pipe filling apparatus according to the present invention will be described with reference to FIG. The instrumentation pipe water filling device 19 of the present embodiment is provided with a housing 29, an air permeable film 22 provided in the housing 29 so as to traverse the inside of the housing 29, and provided below the air permeable film 22. Water chamber 20 and an air chamber 23 provided above the air permeable membrane 22. A vacuum pump 24 for reducing the pressure inside the air chamber 23 is mounted and fixed on the upper surface of the housing 29. In the water chamber 20, a plurality of baffle plates 21 are provided alternately so as to cross up and down. Fluids meander and flow through these baffles 21. A water outlet side plug 27 is connected to a lower left portion of the water chamber 20, and a water inlet side plug 28 is connected to an upper right portion of the water chamber 20. Water outlet side plug 27
Is connected to the hose 11, and the water inlet side plug 28 is connected to the system 16 for replenishing water via a valve 30. In FIG. 1, the piping system shown on the left side from the instrumentation piping water filling device 19 is the same as the system described in FIG.

FIG. 1 shows a system for supplying water.
The water filling water supplied from 16 flows to the instrumentation pipe water filling device 19 and meanders up and down in the water chamber 20 by the baffle plates 21 provided in a staggered manner. At this time, the dissolved air 18 mixed in the water fills the upper part of the water chamber 20, passes through the air permeable membrane 22, and escapes to the air chamber 23 side.

The air chamber 23 side blocked by the air permeable film 22 is maintained at a negative pressure by a vacuum pump 24. For this reason,
When the dissolved air 18 dissolved in the water is in contact with the air permeable membrane 22, it is sucked out to the air chamber 23 side.

By providing a large number of baffles 21 in the water chamber 20, it becomes possible to deaerate the water in a stepwise manner.
At the outlet side of the instrumentation piping water filling device 19, it is possible to continuously supply sufficiently degassed water.

When there is no system 16 for supplying water, the electric pump 14 and the tank 15 shown in FIG. 2 are provided at the inlet side of the instrumentation pipe water filling device 19 as shown in FIG. At the outlet side of the pipe filling apparatus 19, it is possible to continuously supply sufficiently degassed water. In addition, by installing this instrumentation pipe water filling device 19 on the cart 25 with casters, it is made portable and easy to carry.

Next, a water filling method will be described using the instrumentation pipe water filling apparatus 19 according to the present embodiment as an example of measuring a reactor water level in a nuclear power plant. Reactor water level measurement consists of a reactor pressure vessel 1 and a differential pressure gauge 2 for measuring the reactor water level.
And an instrumentation pipe 3 for guiding the head pressure on the reactor side to the high pressure side of the differential pressure gauge 2, and an instrumentation pipe 3a for guiding the head pressure of the reference water level on the reference vessel 4 side to the low pressure side of the differential pressure gauge 2. And drain pipes 6, 6a for draining water from the instrumentation pipes 3, 3b to the funnel 5.

The drain pipes 6, 6a are connected to a drain header 6b.
And are connected to the funnel 5 via the stop valve 7. In the instrumentation pipes 3 and 3a, detection source valves 8 and 8a are provided on the side of the reactor vessel 1 and instrument inlet valves 9 and 9a are provided on the differential pressure gauge 2 side. Drain valves 10 and 10a are provided in the drain pipes 6 and 6a. On the differential pressure gauge 2 side of the drain header 6b, a connection port 12 for connecting a hose 11 or the like from the outside is provided. The water filling method will be described taking the instrumentation pipe 3a as an example.

The water for filling is connected from the system 16 for supplying the filling water to the connection port 12 via the hose 11 through the instrumentation pipe filling device 19, and the drain header 6 b and the drain pipe 6 are connected.
, The detection source valve 8a is fully opened and the instrumentation pipe 3a is filled with water approximately 10 times the capacity of the instrumentation pipe 3a.

With this operation alone, the air in the instrumentation pipe 3a is blown and filled with deaerated water. This eliminates the need for the conventional hand pump 13 to refill the water. Further, it is not necessary to circulate and heat the reactor water and raise the temperature of the water in the instrumentation pipe 3a before the degassing operation at the time of starting the reactor to degas.

In the instrumentation piping water filling device 19,
Although an example is shown in which the baffle plates 21 are provided in the water chamber 20 in a zigzag manner so that the water meanders, the present invention is not limited to this, and the baffle plates 21 may be arranged in an inverted octagonal shape or an inclined shape. In addition, a function of forcibly degassing by adding a heating wire or an ultrasonic generator to the water chamber 20 can be added.

[0032]

As described above, according to the present invention, it is possible to use deaerated water at a flow rate necessary for blowing residual air in an instrumentation pipe or the like for filling the instrumentation pipe or the like. The required working time can be shortened, and furthermore, in a nuclear power plant or the like, the circulating heating operation at the time of startup is not required, and there is an effect that the startup time is reduced and the load on the operator is reduced.

[Brief description of the drawings]

FIG. 1 is a piping system diagram for explaining an embodiment of an instrumentation piping water filling apparatus according to the present invention.

FIG. 2 is a piping system diagram for explaining a conventional instrumentation piping water filling apparatus.

FIG. 3 is a piping diagram for explaining a bubble state of the instrumentation piping in FIG. 2;

[Explanation of symbols]

1: reactor pressure vessel, 2: differential pressure gauge, 3: instrumentation piping (H
Side, 3a ... instrumentation pipe (L side), 4 ... reference vessel, 5 ... funnel, 6 ... drain pipe (H side), 6a ... drain pipe (L side) 7 ... stop valve, 8 ... detection source valve ( Ha), 8a: Detection source valve (L side), 9: Meter inlet valve (H side), 9a: Meter inlet valve (L side), 10: Drain valve (H side), 10a: Drain (L side) , 11 ... Hose, 12 ... Connection port, 13 ... Hand pump, 14 ... Electric pump, 15 ... Tank, 16 ... Water supply system, 17 ... Residual air, 18 ... Dissolved air, 19 ... Instrumentation pipe filling device, 20 ... water chamber, 21 ... baffle plate, 22 ... air permeable membrane, 23 ... air chamber, 24 ... vacuum pump, 25 ... trolley with caster, 26 ... water column equivalent to dissolved air, 27 ... water outlet side plug, 28 ... water Inlet plug, 29 ... housing, 30 ... valve.

Claims (4)

[Claims] 1. A housing, an air permeable film provided in the housing across the inside of the housing, a water chamber provided below the air permeable film, and an air chamber provided above the air permeable film. And a water inlet side and a water outlet side plug provided in the water chamber. 2. The water chamber according to claim 1, wherein a plurality of baffle plates are provided in a staggered manner in the water chamber from above and below, so that water entering from an inlet of the water chamber meanders up and down and flows to an outlet. Instrumentation piping water filling equipment. 3. The structure of an air chamber of an instrumentation piping water filling apparatus according to claim 1, further comprising a vacuum pump capable of generating a negative pressure by a vacuum pump and reducing the pressure in the air chamber. 4. The instrumentation pipe filling apparatus according to claim 1, wherein the casing is mounted on a cart with casters.