CN113324696B - Method for maintaining back-flushing isolation device of nuclear reactor differential pressure and pressure transmitter - Google Patents
Method for maintaining back-flushing isolation device of nuclear reactor differential pressure and pressure transmitter Download PDFInfo
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- CN113324696B CN113324696B CN202110692354.7A CN202110692354A CN113324696B CN 113324696 B CN113324696 B CN 113324696B CN 202110692354 A CN202110692354 A CN 202110692354A CN 113324696 B CN113324696 B CN 113324696B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000002955 isolation Methods 0.000 title claims abstract description 34
- 238000011010 flushing procedure Methods 0.000 title abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 230000008569 process Effects 0.000 claims abstract description 22
- 238000012423 maintenance Methods 0.000 claims abstract description 18
- 238000011001 backwashing Methods 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035485 pulse pressure Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
In order to solve the technical problem that a differential pressure transmitter and a pressure transmitter are difficult to maintain, a back-flushing isolation device of a nuclear reactor differential pressure and pressure transmitter and a maintenance method are provided, and the back-flushing isolation device comprises a first pressure leading pipe, a second instrument valve and a fifth instrument valve; the first pressure guiding pipe, the second pressure guiding pipe and the third pressure guiding pipe are all used for being connected with a process pipeline; the first pressure leading pipe is connected with the H end of the differential pressure transmitter through the second instrument valve and the fifth instrument valve in sequence; the second instrument valve and the fifth instrument valve are connected with the high-pressure water system through a seventh instrument valve; the pressure measuring device comprises a second pressure leading pipe, a first instrument valve and a fourth instrument valve; the second pressure leading pipe is connected with the L end of the differential pressure transmitter through the first instrument valve and the fourth instrument valve in sequence; the first instrument valve and the fourth instrument valve are connected with the high-pressure water system through a sixth instrument valve; the device comprises a third pressure leading pipe, a thirteenth instrument valve and an eleventh instrument valve; the third pressure leading pipe is connected with the high-pressure water system through a thirteenth instrument valve and an eleventh instrument valve in sequence; and the thirteenth meter valve is connected with the pressure transmitter through the twelfth meter valve.
Description
Technical Field
The invention relates to a maintenance method of a recoil isolation device of a nuclear reactor differential pressure and pressure transmitter.
Background
The reactor instrument system mainly comprises a sensor, a signal conversion instrument, a signal operation instrument, a display instrument and other functional instruments. The differential pressure transmitter and the pressure transmitter are generally distributed along a process pipeline in situ as a primary instrument, and a plurality of transmitters are also in direct contact with a loop pipeline medium containing radioactivity, so that the instrument is polluted, maintenance personnel are irradiated by dose during maintenance and repair, and the difficulty in maintenance is increased. On the other hand, along with the increase of the operation time of the reactor and the change of the working condition, impurities and gas can be accumulated in the meter cavity of the transmitter, and the measurement stability and the measurement precision of the transmitter are influenced.
Disclosure of Invention
In order to solve the technical problem that the existing differential pressure transmitter and pressure transmitter are difficult to maintain, the embodiment of the invention provides a method for maintaining a recoil isolation device of a nuclear reactor differential pressure transmitter and a pressure transmitter.
The embodiment of the invention is realized by the following technical scheme:
in a first aspect, embodiments of the present invention provide a back-flushing isolation device for a nuclear reactor differential pressure and pressure transmitter, where the differential pressure transmitter and the pressure transmitter are centrally disposed between primary instruments;
the recoil isolation device includes:
the first pressure guide pipe, the second instrument valve and the fifth instrument valve;
the first pressure leading pipe is used for being connected with a process pipeline;
the first pressure leading pipe is connected with the H end of the differential pressure transmitter through the second instrument valve and the fifth instrument valve in sequence;
a pipeline between the second instrument valve and the fifth instrument valve is connected with the high-pressure water system through a seventh instrument valve;
the recoil isolation device further includes:
the second pressure leading pipe, the first instrument valve and the fourth instrument valve;
the second pressure leading pipe is used for being connected with a process pipeline;
the second pressure leading pipe is connected with the L end of the differential pressure transmitter through the first instrument valve and the fourth instrument valve in sequence;
a pipeline between the first instrument valve and the fourth instrument valve is connected with the high-pressure water system through a sixth instrument valve;
the recoil isolation device further includes:
a third pressure leading pipe, a thirteenth instrument valve and an eleventh instrument valve;
the third pressure leading pipe is used for being connected with a process pipeline;
the third pressure leading pipe is connected with the high-pressure water system through a thirteenth instrument valve and an eleventh instrument valve in sequence;
and the thirteenth instrument valve is connected with the pressure transmitter through a twelfth instrument valve.
Further, the high-pressure water system comprises a high-pressure sealing water pipeline and an eighth instrument valve; and the high-pressure sealing water pipeline is respectively connected with the sixth instrument valve, the seventh instrument valve and the eleventh instrument valve through the eighth instrument valve.
Furthermore, an eighth meter valve, a sixth meter valve, a seventh meter valve and an eleventh meter valve are respectively connected with the high-pressure pump through a ninth meter valve.
Further, the recoil isolation device further comprises a third instrument valve; a pipeline between the fourth instrument valve and the L end of the differential pressure transmitter is connected with one end of the third instrument valve; and a pipeline between the fifth instrument valve and the H end of the differential pressure transmitter is connected with the other end of the third instrument valve.
Furthermore, the eighth meter valve, the sixth meter valve, the seventh meter valve and the eleventh meter valve are connected with the floor drain through a tenth meter valve.
Furthermore, the lengths of the first pressure leading pipe, the second pressure leading pipe and the third pressure leading pipe are more than 30 meters, and deionized water is packaged in the first pressure leading pipe, the second pressure leading pipe and the third pressure leading pipe.
In a second aspect, an embodiment of the present invention provides a maintenance method for the recoil isolation device, including:
back washing state:
closing the fourth, fifth and twelfth meter valves;
opening a first instrument valve, a second instrument valve, a thirteenth instrument valve, a sixth instrument valve, a seventh instrument valve, an eighth instrument valve, a ninth instrument valve and an eleventh instrument valve, and backwashing the first pressure guide pipe, the second pressure guide pipe and the third pressure guide pipe;
and adjusting the opening degrees of the fourth instrument valve, the fifth instrument valve and the twelfth instrument valve to clean the gauge cavity of the pressure transmitter and the differential pressure transmitter.
Further, the method further comprises:
measuring the working state:
closing the eighth, ninth, sixth, seventh and eleventh instrumentation valves;
and opening the first instrument valve, the second instrument valve, the fourth instrument valve, the fifth instrument valve, the twelfth instrument valve and the thirteenth instrument valve to measure the pressure transmitter and the differential pressure transmitter.
Further, the recoil isolation device further comprises a third instrument valve; a pipeline between the fourth instrument valve and the L end of the differential pressure transmitter is connected with one end of the third instrument valve; a pipeline between the fifth instrument valve and the H end of the differential pressure transmitter is connected with the other end of the third instrument valve;
closing the fourth, fifth, and twelfth meter valves further comprises: closing the third meter valve;
open first instrument valve, second instrument valve, thirteenth instrument valve, sixth instrument valve, seventh instrument valve, eighth instrument valve, ninth instrument valve and eleventh instrument valve, to first pressure pipe, second pressure pipe and third pressure pipe backwash, still include: the third meter valve is opened.
Furthermore, the eighth instrument valve, the sixth instrument valve, the seventh instrument valve and the eleventh instrument valve are connected with the floor drain through a tenth instrument valve;
said closing the fourth, fifth and twelfth meter valves; also includes; closing the tenth meter valve;
the first instrument valve, the second instrument valve, the fourth instrument valve, the fifth instrument valve, the twelfth instrument valve and the thirteenth instrument valve are opened, and the pressure transmitter and the differential pressure transmitter are measured; further comprising opening a tenth meter valve.
Compared with the prior art, the embodiment of the invention has the following advantages and beneficial effects:
according to the maintenance method of the backflushing isolation device of the nuclear reactor differential pressure and pressure transmitter, the differential pressure transmitter and the pressure transmitter are arranged between the primary instruments in a centralized mode, and the backflushing isolation device is used for backflushing the surface cavities of the differential pressure transmitter and the pressure transmitter, so that convenience and efficiency of instrument maintenance are improved, and maintenance cost is reduced; the differential pressure transmitter and the pressure transmitter are prevented from being directly contacted with radioactive water.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of the structural principles of a back-flushing isolation device for a nuclear reactor differential pressure and pressure transmitter.
FIG. 2 is a schematic diagram of a differential pressure transmitter and a back-flushing isolation device of the pressure transmitter.
FIG. 3 is a back-flushing schematic diagram of a differential pressure transmitter and a back-flushing isolation device of the pressure transmitter.
Reference numbers and corresponding part names in the drawings:
1-a first pressure-leading pipe, 2-a second pressure-leading pipe and 3-a third pressure-leading pipe; 4-floor drain; 5-instrument drainage or vent holes; 6-high pressure water pipeline; 7-process piping; 8-a pressure transmitter; 9-differential pressure transmitter; v-1-first instrumentation valve; v-2-second meter valve; v-3-third instrument valve; v-4-fourth meter valve; v-5-fifth instrument valve; v-6-sixth instrument valve; v-7-seventh instrument valve; v-8-eighth instrument valve; v-9-ninth instrument valve; v-10-tenth instrument valve; v-11-eleventh instrument valve; v-12-twelfth instrument valve; v-13-thirteenth instrument valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
Referring to fig. 1, an embodiment of the present invention provides a back-flushing isolation device for a nuclear reactor differential pressure and pressure transmitter, wherein the differential pressure transmitter and the pressure transmitter are centrally disposed between primary instruments;
the recoil isolation device includes: the first pressure guide pipe, the second instrument valve and the fifth instrument valve; the first pressure leading pipe is used for being connected with a process pipeline;
the first pressure leading pipe is connected with the H end of the differential pressure transmitter through the second instrument valve and the fifth instrument valve in sequence;
a pipeline between the second instrument valve and the fifth instrument valve is connected with the high-pressure water system through a seventh instrument valve;
the recoil isolation device further includes:
the second pressure leading pipe, the first instrument valve and the fourth instrument valve;
the second pressure leading pipe is used for being connected with a process pipeline;
the second pressure leading pipe is connected with the L end of the differential pressure transmitter through the first instrument valve and the fourth instrument valve in sequence;
a pipeline between the first instrument valve and the fourth instrument valve is connected with the high-pressure water system through a sixth instrument valve;
the recoil isolation device further includes:
a third pressure leading pipe, a thirteenth instrument valve and an eleventh instrument valve;
the third pressure leading pipe is used for being connected with a process pipeline;
the third pressure leading pipe is connected with the high-pressure water system through a thirteenth instrument valve and an eleventh instrument valve in sequence;
and the thirteenth instrument valve is connected with the pressure transmitter through a twelfth instrument valve.
Referring to fig. 1-3, the transmitter back-flushing isolation device is composed of a pressure pipe, a measuring valve group, a back-flushing valve group and a high-pressure water system. The transmitters are arranged in a primary instrument room in a near centralized arrangement mode, and pressure leading pipes at different pressure taking positions are led to a differential pressure transmitter 9 and a pressure transmitter 8 in the primary instrument room from a process pipeline 7 after passing through a measuring valve group and a recoil valve group, so that differential pressure and pressure measurement is realized. During normal operation and non-maintenance of the reactor, opening a measuring valve group and closing other valves; and during shutdown maintenance, other valves are closed, the recoil valve group is opened, and the high-pressure water system is started to recoil impurities and gases in the differential pressure transmitter, the pressure transmitter surface cavity and each pressure guide pipe into the process loop through the recoil valve group.
The structural principle of the recoil isolator is shown in fig. 1. Optionally, the lengths of the first pressure guiding pipe, the second pressure guiding pipe and the third pressure guiding pipe are more than 30 meters, and deionized water is sealed in the first pressure guiding pipe 1, the second pressure guiding pipe 2 and the third pressure guiding pipe 3.
The pressure guiding pipe is used for connecting a process loop with a differential pressure transmitter and a pressure transmitter, the pipe diameter of the pressure guiding pipe is generally 14 mm to 2mm of the standard, the pressure guiding pipe is made of stainless steel, the length of the pressure guiding pipe can reach more than 30m, pressure transmission can be achieved through the pressure guiding pipe with the proper length, meanwhile, static deionized water is packaged in the pipe, the loop water can be effectively prevented from permeating the transmitter, and an isolation effect is achieved.
The measuring valve group refers to a first instrument valve V-1, a second instrument valve V-2, a fourth instrument valve V-4, a fifth instrument valve V-5, a twelfth instrument valve V-12 and a thirteenth instrument valve V-13 in the figure 1, and is divided into a pressure transmitter measuring valve group and a differential pressure transmitter measuring valve group according to different transmitter measuring modes. When the reactor is running, the measuring valve group is opened, and other valves are closed.
The pressure transmitter's measurement valve group refers to the twelfth and thirteenth instrumentation valves V-12 and V-13 of fig. 1. When pressure measurement is carried out, the twelfth instrument valve V-12 and the thirteenth instrument valve V-13 are opened, and pressure on the process pipeline is transmitted to the pressure transmitter through pressure transmission of the pressure guiding pipe 3, so that measurement of liquid pressure on the process pipeline is realized.
A measuring valve group of the differential pressure transmitter refers to a first instrument valve V-1, a second instrument valve V-2, a fourth instrument valve V-4 and a fifth instrument valve V-5 in the graph 1, pressure at one end of a throttling device on a process pipeline is transmitted to a first pressure guide pipe, the second instrument valve V-2 and the fifth instrument valve V-5 through pressure and finally to the H end of the differential pressure transmitter, and pressure at the other end of the throttling device is transmitted to the second pressure guide pipe, the first instrument valve V-1 and the fourth instrument valve V-4 through pressure and finally to the L end of the differential pressure transmitter. Because the pressures at the two ends of the throttling device are unequal, differential pressure measurement is realized.
Composition and function of recoil valve group
The recoil valve group is divided into a pressure transmitter recoil valve group and a differential pressure transmitter recoil valve group by referring to a first instrument valve V-1, a second instrument valve V-2, a third instrument valve V-3, a fourth instrument valve V-4, a fifth instrument valve V-5, a sixth instrument valve V-6, a seventh instrument valve V-7, an eleventh instrument valve V-11, a twelfth instrument valve V-12 and a thirteenth instrument valve V-13 in the figure 1. When the reactor is shut down for maintenance, the recoil valve group is opened, and other valves are closed.
Referring to an eleventh instrument valve V-11, a twelfth instrument valve V-12 and a thirteenth instrument valve V-13 in the figure 1, when the pressure leading pipe is backflushed, high-pressure deionized water of a high-pressure water pipeline 6 of a high-pressure water system backflushes the dirt-containing impurities in the third pressure leading pipe 3 back to the process pipeline through the eleventh instrument valve V-11 and the thirteenth instrument valve V-13, and meanwhile, sealing water can also flush a surface cavity of the pressure transmitter by slightly opening the twelfth instrument valve V-12, and finally the cleaning effect on the pressure transmitter is achieved.
Referring to a first instrument valve V-1, a second instrument valve V-2, a third instrument valve V-3, a fourth instrument valve V-4, a fifth instrument valve V-5, a sixth instrument valve V-6 and a seventh instrument valve V-7 in a drawing 1-3, when the back flushing of the pressure guiding pipe is carried out, the first instrument valve V-1, the second instrument valve V-2, the third instrument valve V-3, the sixth instrument valve V-6 and the seventh instrument valve V-7 are opened, high-pressure deionized water of a high-pressure water system respectively returns back to a back flushing process pipeline containing sewage impurities in the second pressure guiding pipe 2 and the first pressure guiding pipe 1 through the sixth instrument valve V-6, the fourth instrument valve V-4, the first instrument valve V-1 and the seventh instrument valve V-7, the fifth instrument valve V-5 and the second instrument valve V-2, particularly, the third instrument valve V-3 belongs to a balance valve, so that the phenomenon that the instrument is damaged by leaked high-pressure water possibly existing in the fourth instrument valve V-4 and the fifth instrument valve V-5 during backflushing is prevented. When the gauge cavity of the differential pressure transmitter is subjected to back flushing cleaning, the sixth instrument valve V-6 and the seventh instrument valve V-7 are opened, the first instrument valve V-1, the second instrument valve V-2 and the third instrument valve V-3 are closed, the fourth instrument valve V-4 and the fifth instrument valve V-5 are slightly opened (the instruments are prevented from being damaged by high-pressure water). And high-pressure water reaches the surface cavity through a sixth instrument valve V-6, a seventh instrument valve V-7, a fourth instrument valve V-4 and a fifth instrument valve V-5, the surface cavity is cleaned, and then the high-pressure water flows out to a water receiving tank through instrument liquid drainage or an exhaust hole 5 and finally is drained to a floor drain 4 to be discharged.
The high pressure deionized water required by the high pressure water system is provided by a third party system, the eighth instrument valve V-8 in figure 1 is a pressure regulating valve, and the high pressure water required by the instrument back flushing water isolation device can be obtained by regulating the valve and observing the pressure gauge in figure 1. Generally, for instrument recoil isolation devices of low-temperature and low-pressure stacks, a high-pressure water system is generally required to provide a constant pressure of usually 0-2.5 Mpa. For the instrument recoil isolation device of the test circuit, a high-pressure water system is required to provide 6Mpa pulse pressure.
The embodiment of the invention also provides a maintenance method of the recoil isolating device, which comprises the following steps:
back washing state:
closing the fourth, fifth and twelfth meter valves;
opening a first instrument valve, a second instrument valve, a thirteenth instrument valve, a sixth instrument valve, a seventh instrument valve, an eighth instrument valve, a ninth instrument valve and an eleventh instrument valve, and backwashing the first pressure guide pipe, the second pressure guide pipe and the third pressure guide pipe;
and adjusting the opening degrees of the fourth instrument valve, the fifth instrument valve and the twelfth instrument valve to clean the gauge cavity of the pressure transmitter and the differential pressure transmitter.
The recoil isolating device is divided into two modes according to the working mode: (1) when the reactor is in the operation stage, the transmitter recoil isolating device is in the measuring working state, and at the moment, the differential pressure transmitter and the pressure transmitter use the pressure transmission of the pressure guiding pipe to measure the differential pressure and the pressure of the process pipeline. (2) When the reactor is stopped and maintained, the transmitter backflushing isolation device can work in a backflushing state, dirty substances of the pressure leading pipe are flushed back to the process pipeline by high-pressure backflushing water, and meanwhile, the surface cavity of the differential pressure and pressure transmitter is cleaned. The method comprises the following specific steps:
1) measuring operating conditions
a. And closing the eighth instrument valve V-8, the ninth instrument valve V-9 and the tenth instrument valve V-10 to confirm that the transmitter recoil isolating device has no residual high-pressure water.
b. The third meter valve V-3, the sixth meter valve V-6, the seventh meter valve V-7 and the eleventh meter valve V-11 are closed.
c. And opening a fourth instrument valve V-4, a fifth instrument valve V-5, a first instrument valve V-1, a second instrument valve V-2, a twelfth instrument valve V-12 and a thirteenth instrument valve V-13 to measure the pressure of the pressure transmitter and the differential pressure of the differential pressure transmitter.
2) Recoil operating condition
a. And opening the eighth instrument valve V-8, the ninth instrument valve V-9 and the tenth instrument valve V-10 to confirm that the high-pressure water generated by the high-pressure water system is normal.
b. Tenth meter valve V-10 is closed.
c. And adjusting the pressure of the eighth instrument valve V-8, and observing the pressure gauge to enable the high-pressure water pressure generated by the high-pressure water system to meet the backwashing requirement of the backwashing isolating device.
d. The fourth meter valve V-4, the fifth meter valve V-5 and the twelfth meter valve V-12 are closed.
And opening a third instrument valve V-3 to prevent damage to a differential pressure transmitter instrument during backflushing.
e. And opening a first instrument valve V-1, a second instrument valve V-2, a thirteenth instrument valve V-13, a sixth instrument valve V-6, a seventh instrument valve V-7 and an eleventh instrument valve V-11 to prepare for pressure guide pipe recoil.
f. And closing the first instrument valve V-1, the second instrument valve V-2 and the third instrument valve V-3, and stopping the back flushing of the pressure guiding pipe.
g. And slightly opening a fourth instrument valve V-4, a fifth instrument valve V-5 and a twelfth instrument valve V-12 to clean the pressure and differential pressure transmitter cavity.
h. And closing the eighth instrument valve V-8, the ninth instrument valve V-9, the third instrument valve V-3, the sixth instrument valve V-6, the seventh instrument valve V-7 and the eleventh instrument valve V-11, opening the tenth instrument valve V-10 and finishing the backflushing process.
The recoil isolation device and the maintenance method of the embodiment of the invention, which have the advantages of simple structure, reasonability, reliability and convenient use, can avoid radiation hazard caused by the local deployment of the differential pressure transmitter and the pressure transmitter, avoid the pollution of the instrument by radioactive water, facilitate the maintenance of the instrument by maintenance personnel, and are safe and reliable through field experiments, thereby meeting the field use requirements.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (1)
1. A maintenance method of a recoil isolator of a nuclear reactor differential pressure and pressure transmitter is characterized in that,
the differential pressure transmitter and the pressure transmitter are arranged between the primary instruments in a centralized manner;
the recoil isolation device includes:
the first pressure guide pipe, the second instrument valve and the fifth instrument valve;
the first pressure leading pipe is used for being connected with a process pipeline;
the first pressure leading pipe is connected with the H end of the differential pressure transmitter through the second instrument valve and the fifth instrument valve in sequence;
a pipeline between the second instrument valve and the fifth instrument valve is connected with the high-pressure water system through a seventh instrument valve;
the recoil isolation device further includes:
the second pressure leading pipe, the first instrument valve and the fourth instrument valve;
the second pressure leading pipe is used for being connected with a process pipeline;
the second pressure leading pipe is connected with the L end of the differential pressure transmitter through the first instrument valve and the fourth instrument valve in sequence;
a pipeline between the first instrument valve and the fourth instrument valve is connected with the high-pressure water system through a sixth instrument valve;
the recoil isolation device further includes:
a third pressure leading pipe, a thirteenth instrument valve and an eleventh instrument valve;
the third pressure leading pipe is used for being connected with a process pipeline;
the third pressure leading pipe is connected with the high-pressure water system through a thirteenth instrument valve and an eleventh instrument valve in sequence;
the thirteenth instrument valve is connected with the pressure transmitter through a twelfth instrument valve;
the high-pressure water system comprises a high-pressure sealing water pipeline and an eighth instrument valve; the high-pressure sealing water pipeline is respectively connected with a sixth instrument valve, a seventh instrument valve and an eleventh instrument valve through an eighth instrument valve;
the eighth instrument valve, the sixth instrument valve, the seventh instrument valve and the eleventh instrument valve are respectively connected with the high-pressure pump through the ninth instrument valve;
the recoil isolation device further comprises a third instrument valve; a pipeline between the fourth instrument valve and the L end of the differential pressure transmitter is connected with one end of the third instrument valve; a pipeline between the fifth instrument valve and the H end of the differential pressure transmitter is connected with the other end of the third instrument valve;
the eighth instrument valve, the sixth instrument valve, the seventh instrument valve and the eleventh instrument valve are connected with the floor drain through the tenth instrument valve; the lengths of the first pressure guiding pipe, the second pressure guiding pipe and the third pressure guiding pipe are more than 30 meters, and deionized water is packaged in the first pressure guiding pipe, the second pressure guiding pipe and the third pressure guiding pipe;
the maintenance method comprises the following steps:
back washing state:
closing the fourth, fifth and twelfth meter valves;
opening a first instrument valve, a second instrument valve, a thirteenth instrument valve, a sixth instrument valve, a seventh instrument valve, an eighth instrument valve, a ninth instrument valve and an eleventh instrument valve, and backwashing the first pressure guide pipe, the second pressure guide pipe and the third pressure guide pipe;
adjusting the opening degrees of the fourth instrument valve, the fifth instrument valve and the twelfth instrument valve to clean the gauge cavity of the pressure transmitter and the differential pressure transmitter;
measuring the working state:
closing the eighth, ninth, sixth, seventh and eleventh instrumentation valves;
opening a first instrument valve, a second instrument valve, a fourth instrument valve, a fifth instrument valve, a twelfth instrument valve and a thirteenth instrument valve, and measuring a pressure transmitter and a differential pressure transmitter;
the recoil isolation device further comprises a third instrument valve; a pipeline between the fourth instrument valve and the L end of the differential pressure transmitter is connected with one end of the third instrument valve; a pipeline between the fifth instrument valve and the H end of the differential pressure transmitter is connected with the other end of the third instrument valve;
closing the fourth, fifth, and twelfth meter valves further comprises: closing the third meter valve;
open first instrument valve, second instrument valve, thirteenth instrument valve, sixth instrument valve, seventh instrument valve, eighth instrument valve, ninth instrument valve and eleventh instrument valve, to first pressure pipe, second pressure pipe and third pressure pipe backwash, still include: opening a third meter valve;
the eighth instrument valve, the sixth instrument valve, the seventh instrument valve and the eleventh instrument valve are connected with the floor drain through the tenth instrument valve;
said closing the fourth, fifth and twelfth meter valves; further comprising: closing the tenth meter valve;
the first instrument valve, the second instrument valve, the fourth instrument valve, the fifth instrument valve, the twelfth instrument valve and the thirteenth instrument valve are opened, and the pressure transmitter and the differential pressure transmitter are measured; further comprising opening a tenth meter valve.
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