CN106057258A - Online metering method of nuclear power plant electrical penetration assembly pressure gauge and pressure monitoring device of method - Google Patents
Online metering method of nuclear power plant electrical penetration assembly pressure gauge and pressure monitoring device of method Download PDFInfo
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- CN106057258A CN106057258A CN201610375782.6A CN201610375782A CN106057258A CN 106057258 A CN106057258 A CN 106057258A CN 201610375782 A CN201610375782 A CN 201610375782A CN 106057258 A CN106057258 A CN 106057258A
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- pressure gauge
- pressure
- electrical penetration
- nuclear power
- power station
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/002—Detection of leaks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention discloses an online metering method of a nuclear power plant electrical penetration assembly pressure gauge and a pressure monitoring device of the method. The pressure monitoring device comprises a three-way valve set, a standard pressure meter and a nitrogen tank, wherein the three-way valve set is arranged on a connecting pipeline between an electrical penetration assembly and the pressure gauge and used for closing and isolating the electrical penetration assembly and the pressure gauge, the standard pressure meter is communicated with the pressure gauge through the same connecting pipeline and used for obtaining the precise pressure value of gas in the connecting pipeline, and the nitrogen tank is connected with an adjusting valve and then adjusts the gas in the connecting pipeline to reach a verification pressure point together with the pressure gauge and the standard pressure meter. The electrical penetration assembly carried pressure gauge can be online metered and verified in the running process, the regular verification of the precision of the pressure gauge is achieved on the premise of ensuring the integrity of a third safety barrier, and therefore pressure gauges which can not meet the precision requirement are replaced in time.
Description
Technical field
The present invention relates to technical field of nuclear power safety, particularly relate to a kind of nuclear power station electrical penetration Pressure gauge on-line metering
Method and pressure monitoring device thereof.
Background technology
Nuclear power plant containment shell, i.e. reactor building, be a cylindrical prestressed reinforced concrete with torispheric domes
Soil structure, is used for stopping the fission product from fuel and last one barrier of primary Ioops radioactive substance entrance environment.When
During reactor generation loss of-coolant accident (LOCA), a large amount of radioactivity discharged and High Temperature High Pressure steam water interface can inclusive and isolation,
To prevent from nuclear power station surrounding resident is produced harm.
Nuclear power plant containment shell is most important for the safety of nuclear power station, it is therefore desirable to ensure containment to greatest extent
Performance is up to standard.Containment bulge test is used for simplation verification containment sealing energy under large break dehydration (LOCA) emergency conditions
Power, for ensure nuclear power plant operation have very important meaning, Construction of Unit stage and unit operation stage be required to into
Row test.Wherein, the electric wire within electrical penetration, i.e. reactor building leads to outside transmission channel, runs through safety
Thimble body, plays nuclear power station the 3rd road protective screen jointly with containment body, machinery penetration piece, access lock, equipment gate
The key player of barrier.As shown in Figure 4, existing electrical penetration 1 is generally located in containment body 2；Inside containment
21 extend through outside containment 22, it is achieved the connection of inside cable 3 and external cable 4；By nitrogen interface 6 to electrical penetration
The Pneumatic assembly of 1 provides power, it is achieved pressure closed shield, the force value within electrical penetration 1 monitored by Pressure gauge 5.Normally
During operation, inside electrical penetration, need to maintain the pressure of 2.5 ± 10%bar.g, to limit radioactive substance by electrical penetration
Leak.
Though electrical penetration is mounted in the quiet machine equipment on npp safety shell, it is arranged on fluid line relative to other
And without outside focus for the Pressure gauge on rotating machinery, but the internal mechanical that the severe and life-time service of its installation environment causes
, there is the inaccurate risk of monitor value in damage.If a certain piece of manometric monitor value is inaccurate, then cannot complete electrically passing through
Wear the real-time monitoring of part internal pressure, cannot judge that electrical penetration pressure boundary is the most complete afterwards.And once Pressure gauge is not
Trace into the signal that electrical penetration pressure is low in time, the risk that radioactive substance leaks will be there is.Therefore, need to be to electrically running through
Part Pressure gauge carries out periodic dosages to guarantee its accuracy.But, the restriction of electrical penetration structure, electrical penetration is from pressure
Power table cannot be carried out periodic metering, thus cannot judge to run whether later stage manometric precision meets onsite application demand.
If carrying out off-line metering, equipment pressure release need to be experienced, Pressure gauge dismounting, censorship, Pressure gauge return the stage such as dress, equipment pressurising.Should
The method not only persistent period is longer, has the risk losing pressure boundary integrity.Meanwhile, during equipment pressure release, nitrogen is also brought along
Suffocate risk.
Summary of the invention
The present invention is directed to present in prior art existing electrical penetration Pressure gauge can not the metering of property performance period, carry out
Off-line metrological operation is complicated, and the persistent period is long, there is also this technology of risk that nitrogen suffocates and loses pressure boundary integrity
Problem, it is provided that a kind of nuclear power station electrical penetration Pressure gauge on-line metering method and pressure monitoring device thereof.
On the one hand, the invention provides a kind of nuclear power station electrical penetration Pressure gauge on-line metering method, including following step
Rapid:
S1, the connection pipeline closed between electrical penetration and Pressure gauge, isolate described electrical penetration and described pressure
Table；
S2, the Pressure gauge connecting needs metering and standard pressure gauge, nitrogen pot；
S3, regulation connect the gas pressure value in pipeline, and described Pressure gauge is examined in school.
Optionally, in described step S2, described Pressure gauge with, standard pressure gauge, nitrogen pot be connected pipeline even by same
Logical.
Optionally, described step S3 also includes sub-step:
S31, regulation connect gas pressure value arrival school inspection pressure spot in pipeline；
Pressure gauge described in S32, comparison and the standard pressure gauge deviation of reading value when school inspection pressure spot, it is judged that described Pressure gauge
Whether meet required precision.
Optionally, described nuclear power station electrical penetration Pressure gauge on-line metering method is further comprising the steps of:
S4, obtain ambient temperature value in real time, revise the deviation of reading value when school inspection pressure spot.
Optionally, the accuracy class of described standard pressure gauge should be not less than described manometric 1/4.
On the other hand, present invention also offers the pressure monitoring dress of a kind of nuclear power station electrical penetration Pressure gauge on-line metering
Put, including:
Three-way valve group, on the connection pipeline that described three-way valve group is arranged between electrical penetration and Pressure gauge, is used for sealing
Close and isolate described electrical penetration and Pressure gauge；
Standard pressure gauge, is connected pipeline communication with described Pressure gauge by same, connects gas in pipelines for obtaining
Accurate pressure value；
Nitrogen pot, with described Pressure gauge, standard pressure gauge after connection one regulation valve, regulates the gas in described connection pipeline
Arrive school inspection pressure spot.
Optionally, described pressure monitoring device also includes nitrogen monitoring modular, obtains environment nitrogen content number in real time
Value.A small amount of leakage of nitrogen it is likely to result in, by this module monitors nitrogen content to guarantee the safety of metrological personnel during metering.
Optionally, described pressure monitoring device also includes temperature monitoring module, obtains ambient temperature value in real time.Nitrogen
Gas pressure under different temperature conditionss can change, according to nitrogen air pressure change rule under different ambient temperatures
Rule, correction Pressure gauge and the measurement numerical value of standard pressure gauge, thus the error that when reducing metering, temperature introduces.
Optionally, described standard pressure gauge accuracy class is not less than tested manometric 1/4；Described electrical penetration pressure
The accuracy class of table is 1.6 grades；Described standard pressure gauge accuracy class is not less than 0.4 grade；
Optionally, described standard pressure gauge, nitrogen pot, nitrogen monitoring modular and temperature monitoring module are arranged on a metering
On support；The bottom of described metering support is provided with travel mechanism, for the most mobile described pressure monitoring device.
Optionally, the steel frame construction of multiple draw-in groove, described standard pressure gauge, nitrogen it are provided with in described metering support
Gas tank, nitrogen monitoring modular and temperature monitoring module are arranged in described draw-in groove.
Optionally, described three-way valve group includes penetration piece interface, inflatable interface, pressure gauge connection and the first stop valve；Institute
Stating that penetration piece interface is relative with described inflatable interface to be connected, described pressure gauge connection is by filling with described with described penetration piece interface
Gas interface is connected by vertical pipe, and described first stop valve is arranged between described penetration piece interface and described inflatable interface,
For ending described inflatable interface；Described vertical pipe is additionally provided with pressure measurement device interface, described pressure gauge connection
Connecting with described pressure measurement device interface, the second stop valve is arranged on below described pressure measurement device interface, is used for ending
Described pressure gauge connection and described pressure measurement device interface.
One or more technical schemes that the present invention program provides, at least have the following technical effect that or advantage:
In technical scheme, nuclear power station electrical penetration Pressure gauge on-line metering method: electrical penetration with
Three-way valve group is added between Pressure gauge, to realize electrical penetration and manometric isolation, by the introducing of three-way valve group, permissible
Complete in the case of not pressure release manometric on-line metering；The most both ensure that the integrity of pressure boundary, also tested simultaneously
Demonstrate,prove manometric accuracy.Therefore, technical scheme can carry Pressure gauge to the electrical penetration of run duration
Carry out on-line metering verification, on the premise of guaranteeing that the 3rd road safety curtain is complete, it is achieved the periodic verification of Pressure gauge precision, from
And Pressure gauge undesirable to required precision is changed in time.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to
The accompanying drawing provided obtains other accompanying drawing.
The first nuclear power station electrical penetration Pressure gauge on-line metering method flow that Fig. 1 provides for the embodiment of the present invention
Figure；
The second nuclear power station electrical penetration Pressure gauge on-line metering method flow that Fig. 2 provides for the embodiment of the present invention
Figure；
The third nuclear power station electrical penetration Pressure gauge on-line metering method flow that Fig. 3 provides for the embodiment of the present invention
Figure；
Fig. 4 is the mounting structure schematic diagram of the existing electrical equipment penetration piece in the present invention；
Fig. 5 is the pressure monitoring device mounting structure schematic diagram in the present invention；
Fig. 6 is the three-way valve group front sectional view in the present invention；
Fig. 7 is the three-way valve group left view sectional view in the present invention.
Detailed description of the invention
By providing a kind of nuclear power station electrical penetration Pressure gauge on-line metering method in the embodiment of the present invention, solve existing
During having the metering of electrical penetration Pressure gauge, the following technical problem existed:
1) metering cycle is long；Nuclear power station single unit is provided with 79 electrical penetrations altogether to realize cable and wire inside and outside nuclear island
Transmission；If implementing manometric regular censorship, then certainly will experience pressure release, Pressure gauge dismounting, censorship, return dress, pressurising etc. many
In the individual stage, time-consumingly will directly result in electrical penetration and be chronically at, at about two months, the state that pressure is the most monitored.
2) pressure release causes the integrity that cannot ensure the 3rd road barrier；Containment cylinder, personnel and equipment gate, machinery pass through
Wear part, electrical penetration together constitutes the 3rd road safety curtain of nuclear power station, and the inefficacy of any of which ingredient all can be led
Cause the imperfect of pressure boundary.
3) risk that nitrogen makes people suffocate is introduced；For ensureing sealing, electrical penetration is filled with about 15m3Nitrogen
Gas is to maintain pressure.Therefore, will there is about 15m during pressure release3Nitrogen be released in surrounding, there is compressed nitrogen and suffocate
Risk.
The technical scheme of the embodiment of the present invention is for solving above-mentioned technical problem, and general thought is as follows:
Owing to existing electrical penetration cylinder is joined directly together with Pressure gauge pipeline, middle do not have any obstruct to arrange
Impose its independence of guarantee, therefore be difficulty with manometric on-line metering under the current model.Technical scheme is improved
Electrical penetration and Pressure gauge connecting line, add three-way valve group between penetration piece cylinder and Pressure gauge, to realize running through
Part and manometric isolation, and coordinate a whole set of Portable metering device to use, thus reach the purpose of Pressure gauge on-line metering.
As it is shown in figure 1, the present invention improves a kind of nuclear power station electrical penetration Pressure gauge on-line metering method, including following
Step:
S1, the connection pipeline closed between electrical penetration and Pressure gauge, isolate described electrical penetration and described pressure
Table；
S2, the Pressure gauge connecting needs metering and standard pressure gauge, nitrogen pot；
S3, regulation connect the gas pressure value in pipeline, and described Pressure gauge is examined in school.
Optionally, in described step S2, described Pressure gauge with, standard pressure gauge, nitrogen pot be connected pipeline even by same
Logical.
In specific implementation process, refer to Fig. 2, a kind of described nuclear power station electrical penetration Pressure gauge on-line metering method
Described in step S3 also include sub-step:
S31, regulation connect gas pressure value arrival school inspection pressure spot in pipeline；
Pressure gauge described in S32, comparison and the standard pressure gauge deviation of reading value when school inspection pressure spot, it is judged that described Pressure gauge
Whether meet required precision.
In specific implementation process, refer to Fig. 3, a kind of described nuclear power station electrical penetration Pressure gauge on-line metering method
Further comprising the steps of:
S4, obtain ambient temperature value in real time, revise the deviation of reading value when school inspection pressure spot.
Optionally, the accuracy class of described standard pressure gauge should be not less than described manometric 1/4.
Based on same inventive concept, refer to Fig. 5, embodiments of the invention additionally provide a kind of nuclear power station electrical penetration
The pressure monitoring device of Pressure gauge on-line metering, including:
Three-way valve group 10, described three-way valve group 10 is arranged on the connection pipeline between electrical penetration 1 and Pressure gauge 5,
For closing and isolating described electrical penetration 1 and Pressure gauge 5；
Standard pressure gauge 20, is connected pipeline communication with described Pressure gauge 5 by same, is used for obtaining connection gas in pipelines
Accurate pressure value；
Nitrogen pot 30, with described Pressure gauge 5, standard pressure gauge 20 after connection one regulation valve 31, regulates described connection pipeline
Interior gas arrives school inspection pressure spot.
Optionally, described pressure monitoring device also includes nitrogen monitoring modular 40, obtains environment nitrogen content in real time
Numerical value.A small amount of leakage of nitrogen it is likely to result in, by this module monitors nitrogen content to guarantee the peace of metrological personnel during metering
Entirely.
Optionally, described pressure monitoring device also includes temperature monitoring module 50, obtains ambient temperature value in real time.Nitrogen
Gas gas pressure under different temperature conditionss can change, according to nitrogen air pressure change under different ambient temperatures
Rule, correction Pressure gauge and the measurement numerical value of standard pressure gauge, thus the error that when reducing metering, temperature introduces.
Optionally, described standard pressure gauge 20 accuracy class is not less than the 1/4 of tested Pressure gauge 5；Described electrical penetration
The accuracy class of Pressure gauge 5 is 1.6 grades；Described standard pressure gauge 20 accuracy class is not less than 0.4 grade；
Optionally, described standard pressure gauge 20, nitrogen pot 30, nitrogen monitoring modular 40 and temperature monitoring module 50 are arranged
On a metering support 60；The bottom of described metering support 60 is provided with travel mechanism 61, for the most mobile described pressure prison
Survey device.
Optionally, the steel frame construction (not shown) of multiple draw-in groove, described mark it are provided with in described metering support 60
Quasi-piezometer 20, nitrogen pot 30, nitrogen monitoring modular 40 and temperature monitoring module 50 are arranged in described draw-in groove.
Optionally, as shown in Figure 6,7, three-way valve group 10 includes penetration piece interface 101, inflatable interface 102, pressure gauge connection
103, the first stop valve 104；Described penetration piece interface 101 is relative with described inflatable interface 102 to be connected, described pressure gauge connection
103 by connecting by vertical pipe with described inflatable interface 102 with described penetration piece interface 101, described first stop valve 104
It is arranged between described penetration piece interface 101 and described inflatable interface 102, is used for ending described inflatable interface 102；Hang down described
Pressure measurement device interface 105, described pressure gauge connection 103 and described pressure measurement device interface it is additionally provided with on straight pipeline
105 connections, the second stop valve 106 is arranged on below described pressure measurement device interface 105, is used for ending described pressure gauge connection
103 with described pressure measurement device interface 105.
Existing three-way valve group 10 does not have pressure measurement device interface and the second stop valve, it is impossible to realize electrical penetration
And the isolation between Pressure gauge, the first stop valve is used only for ending inflatable interface；Three-way valve group 10 in the present invention is by weight
After new design, it is possible to realize the isolation between electrical penetration and Pressure gauge, and be provided with pressure measurement device interface and pressure
Power table orifice, it is simple to obtain the accurate pressure value of same connection gas in pipelines, and Pressure gauge numerical value is formed and compares.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to include excellent
Select embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the present invention to the present invention
God and scope.So, if these amendments of the present invention and modification belong to the scope of the claims in the present invention and equivalent technologies thereof
Within, then the present invention is also intended to comprise these change and modification.
Claims (11)
1. a nuclear power station electrical penetration Pressure gauge on-line metering method, it is characterised in that comprise the following steps:
S1, the connection pipeline closed between electrical penetration and Pressure gauge, isolate described electrical penetration and described Pressure gauge；
S2, the Pressure gauge connecting needs metering and standard pressure gauge, nitrogen pot；
S3, regulation connect the gas pressure value in pipeline, and described Pressure gauge is examined in school.
A kind of nuclear power station electrical penetration Pressure gauge on-line metering method the most according to claim 1, it is characterised in that institute
State in step S2, described Pressure gauge with, standard pressure gauge, nitrogen pot be connected pipeline communication by same.
A kind of nuclear power station electrical penetration Pressure gauge on-line metering method the most according to claim 1 and 2, its feature exists
Sub-step is also included in, described step S3:
S31, regulation connect gas pressure value arrival school inspection pressure spot in pipeline；
Pressure gauge described in S32, comparison and the standard pressure gauge deviation of reading value when school inspection pressure spot, it is judged that whether described Pressure gauge
Meet required precision.
A kind of nuclear power station electrical penetration Pressure gauge on-line metering method the most according to claim 3, it is characterised in that institute
State nuclear power station electrical penetration Pressure gauge on-line metering method further comprising the steps of:
S4, obtain ambient temperature value in real time, revise the deviation of reading value when school inspection pressure spot.
5. the pressure monitoring device of a nuclear power station electrical penetration Pressure gauge on-line metering, it is characterised in that including:
Three-way valve group, on the connection pipeline that described three-way valve group is arranged between electrical penetration and Pressure gauge, for closing also
Isolate described electrical penetration and Pressure gauge；
Standard pressure gauge, is connected pipeline communication with described Pressure gauge by same, connects the accurate of gas in pipelines for obtaining
Force value；
Nitrogen pot, with described Pressure gauge, standard pressure gauge after connection one regulation valve, regulates the gas in described connection pipeline and arrives
School inspection pressure spot.
The pressure monitoring device of a kind of nuclear power station electrical penetration Pressure gauge on-line metering the most according to claim 5, its
Being characterised by, described pressure monitoring device also includes nitrogen monitoring modular, obtains environment nitrogen content numerical value in real time.
The pressure monitoring device of a kind of nuclear power station electrical penetration Pressure gauge on-line metering the most according to claim 5, its
Being characterised by, described pressure monitoring device also includes temperature monitoring module, obtains ambient temperature value in real time.
8. according to the pressure monitoring of a kind of nuclear power station electrical penetration Pressure gauge on-line metering described in any one of claim 5-7
Device, it is characterised in that described standard pressure gauge accuracy class is not less than tested manometric 1/4；Described electrical penetration pressure
The accuracy class of power table is 1.6 grades；Described standard pressure gauge accuracy class is not less than 0.4 grade.
9. according to the pressure monitoring of a kind of nuclear power station electrical penetration Pressure gauge on-line metering described in any one of claim 5-7
Device, it is characterised in that described standard pressure gauge, nitrogen pot, nitrogen monitoring modular and temperature monitoring module are arranged on a meter
On amount support；The bottom of described metering support is provided with travel mechanism, for the most mobile described pressure monitoring device.
The pressure monitoring device of a kind of nuclear power station electrical penetration Pressure gauge on-line metering the most according to claim 9, its
Be characterised by, in described metering support, be provided with the steel frame construction of multiple draw-in groove, described standard pressure gauge, nitrogen pot,
Nitrogen monitoring modular and temperature monitoring module are arranged in described draw-in groove.
The pressure monitoring device of 11. a kind of nuclear power station electrical penetration Pressure gauge on-line meterings according to claim 9, its
Being characterised by, described three-way valve group includes penetration piece interface, inflatable interface, pressure gauge connection and the first stop valve；Described run through
Part interface is relative with described inflatable interface to be connected, described pressure gauge connection by with described penetration piece interface and described inflatable interface
Being connected by vertical pipe, described first stop valve is arranged between described penetration piece interface and described inflatable interface, for cutting
Only described inflatable interface；Being additionally provided with pressure measurement device interface on described vertical pipe, described pressure gauge connection is with described
Pressure measurement device interface connects, and the second stop valve is arranged on below described pressure measurement device interface, is used for ending described pressure
Power table interface and described pressure measurement device interface.
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| CN201610375782.6A CN106057258B (en) | 2016-05-30 | 2016-05-30 | Nuclear power station electrical penetration pressure gauge on-line metering method and its pressure monitoring device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108257694A (en) * | 2016-12-29 | 2018-07-06 | 中核核电运行管理有限公司 | A kind of nuclear power station main feed system performance supervision method |
| CN111834024A (en) * | 2020-07-23 | 2020-10-27 | 中国核动力研究设计院 | On-line accurate measurement method and system for pressure in containment vessel |
| CN115655575A (en) * | 2022-09-30 | 2023-01-31 | 中核核电运行管理有限公司 | Online calibration equipment of nuclear power plant's electric penetration piece manometer |
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| CN204064589U (en) * | 2014-07-07 | 2014-12-31 | 中广核工程有限公司 | A kind of nuclear power station safety injection pipeline reverse checkvalve leakage test instrument |
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| US4984448A (en) * | 1989-11-16 | 1991-01-15 | Atmos Energy Corporation | Leak detector and utilization pressure manifold |
| US20040123641A1 (en) * | 2001-03-02 | 2004-07-01 | Rene Gilbert | Method and device for controlling a sensor |
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| CN108257694A (en) * | 2016-12-29 | 2018-07-06 | 中核核电运行管理有限公司 | A kind of nuclear power station main feed system performance supervision method |
| CN108257694B (en) * | 2016-12-29 | 2019-09-17 | 中核核电运行管理有限公司 | A kind of nuclear power station main feed system performance supervision method |
| CN111834024A (en) * | 2020-07-23 | 2020-10-27 | 中国核动力研究设计院 | On-line accurate measurement method and system for pressure in containment vessel |
| CN115655575A (en) * | 2022-09-30 | 2023-01-31 | 中核核电运行管理有限公司 | Online calibration equipment of nuclear power plant's electric penetration piece manometer |
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| CN106057258B (en) | 2017-12-05 |
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