CN110929894A - Hierarchical management method and system for small branch pipes of nuclear power station - Google Patents
Hierarchical management method and system for small branch pipes of nuclear power station Download PDFInfo
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Abstract
The invention discloses a hierarchical management method for small branch pipes of a nuclear power station, which comprises the following steps: step S1, a grading strategy is formulated according to the vibration parameters, the stress parameters and the importance levels of the small branch pipes; step S2, determining the corresponding levels of a plurality of small branch pipes on the small branch pipe management list, and establishing a small branch pipe management database; and step S3, detecting and managing a plurality of small branches in the small branch management database according to the preventive detection requirements corresponding to different levels. The invention carries out classification according to the vibration and stress conditions of the small branch pipes by combing the management lists of the small branch pipes; different preventive detection requirements (nondestructive testing and pipeline and component inspection) are formulated according to different grades, potential hidden dangers of the small branch pipes are found in time, passive management is changed into active management, the risk of breakage of the small branch pipes can be effectively reduced, and safe operation of the unit is guaranteed.
Description
Technical Field
The invention relates to the technical field of nuclear power stations, in particular to a method and a system for hierarchical management of small branch pipes of a nuclear power station.
Background
The small branch pipe is used as an important component of a pipeline system, mainly refers to an instrument and a mechanical pipeline with the nominal diameter of less than or equal to 80mm, and the pipeline is generally led out as a branch pipe of a main pipeline and is called as a small branch pipe. The connection of the small branch pipe and the main pipe is usually realized by welding, is a stress concentration part, is sensitive to vibration fatigue, is one of main weak links of a piping system, and is easy to cause the situations of welding seam cracking and pipeline fracture. According to the feedback of the operation experience of the international nuclear power station, thousands of small-size pipeline vibration fatigue cracking events have occurred since 1970, and account for 18.7 percent of the total number of pipeline failure events of the light water reactor nuclear power station. Dozens of small-sized pipelines have vibration fatigue cracking events during the operation of domestic nuclear power stations, and the unit is also stopped seriously.
At present, a unified and clear strategy is lacked for daily inspection and management of small branch pipes, and emergency repair treatment is often organized after the small branch pipes have problems; a regular and preventive small branch management strategy is lacked, the problem of small branch breakage is solved in an initial state, and passive management is converted into active management.
Disclosure of Invention
The invention aims to provide a method and a system for hierarchical management of small branch pipes of a nuclear power station.
The technical scheme adopted by the invention for solving the technical problems is as follows: a hierarchical management method for small branch pipes of a nuclear power station is constructed, and the method comprises the following steps:
step S1, a grading strategy is formulated according to the vibration parameters, the stress parameters and the importance levels of the small branch pipes;
step S2, determining the corresponding levels of a plurality of small branch pipes on the small branch pipe management list, and establishing a small branch pipe management database;
and step S3, detecting and managing a plurality of small branches in the small branch management database according to the preventive detection requirements corresponding to different levels.
In the hierarchical management method for the small branch pipe of the nuclear power plant provided by the present invention, in step S1, the hierarchical policy includes:
a) the pipeline with the vibration parameter more than or equal to 9mm/s and less than 12mm/s is determined as a vibration 0-level pipeline;
b) the pipeline with the vibration parameter more than or equal to 12mm/s and less than the vibration speed threshold value is determined as a vibration 1-level pipeline;
c) the pipeline with the vibration parameter more than or equal to the vibration speed threshold and the stress parameter less than the stress threshold is determined as a vibration 2-level pipeline;
d) the pipeline with the stress parameter more than or equal to the stress threshold value is determined as a vibration 3-level pipeline;
e) if the importance level of the pipe is associated with a trip-heap condition, the corresponding level of the pipeline is increased by one level.
In the hierarchical management method for the small branch pipe of the nuclear power plant provided by the invention, in step S2:
for the pipeline with the vibration level of 0, the preventive detection requirement comprises daily inspection of the pipeline, and if the pipeline is directly connected with the main steam loop, the liquid permeation inspection of a welded junction of the connected pipeline is also carried out;
for the pipeline with the level of vibration 1, the preventive detection requirements comprise daily inspection of the pipeline, inspection of the pipeline and a pipe clamp and liquid permeation inspection of a pipeline welded junction;
for the pipeline with the level of 2 vibration, the preventive detection requirements comprise daily pipeline inspection, pipeline and pipe clamp inspection and pipeline welded junction liquid penetration inspection, the time interval of two adjacent pipeline and pipe clamp inspections is not more than one fuel cycle period, and the time interval of two adjacent pipeline welded junction liquid penetration inspections is not more than three fuel cycle periods;
to the pipeline that the level is vibration 3 grades, the preventive detection requirement includes that pipeline daily inspection, pipeline and pipe strap inspection, pipeline welded junction's radiographic inspection and liquid penetrant inspection, and the time interval of two adjacent pipeline and pipe strap inspections is not more than a fuel cycle, and the time interval of two adjacent pipeline welded junction's radiographic inspection and liquid penetrant inspection is not more than a fuel cycle.
The invention provides a hierarchical management method for small branch pipes of a nuclear power station, which further comprises the following steps:
and step S4, modifying the pipeline with the level of vibration 3, and reclassifying the modified pipeline.
The invention provides a hierarchical management method for small branch pipes of a nuclear power station, which further comprises the following steps:
and step S5, performing life evaluation on the pipeline which still exceeds the standard after being transformed for many times and has no better optimization scheme.
According to another aspect of the present invention, there is also provided a hierarchical management system for small branch pipes of a nuclear power plant, including:
the grading strategy making unit is used for making a grading strategy according to the vibration parameters, the stress parameters and the important grades of the small branch pipes;
the grading unit is used for determining the corresponding grades of the small branch pipes on the small branch pipe management list and establishing a small branch pipe management database;
and the detection management unit is used for detecting and managing a plurality of small branches in the small branch management database according to the preventive detection requirements corresponding to different levels.
In the hierarchical management system for the small branch pipe of the nuclear power plant provided by the invention, the hierarchical strategy comprises the following steps:
a) the pipeline with the vibration parameter more than or equal to 9mm/s and less than 12mm/s is determined as a vibration 0-level pipeline;
b) the pipeline with the vibration parameter more than or equal to 12mm/s and less than the vibration speed threshold value is determined as a vibration 1-level pipeline;
c) the pipeline with the vibration parameter more than or equal to the vibration speed threshold and the stress parameter less than the stress threshold is determined as a vibration 2-level pipeline;
d) the pipeline with the stress parameter more than or equal to the stress threshold value is determined as a vibration 3-level pipeline;
e) if the importance level of the pipe is associated with a trip-heap condition, the corresponding level of the pipeline is increased by one level.
In the hierarchical management system for the small branch pipe of the nuclear power station, for the pipeline with the level of vibration 0, the preventive detection requirement comprises daily inspection of the pipeline, and if the pipeline is directly connected with the main steam loop, the hierarchical management system also comprises the step of performing liquid permeation inspection on a welded junction of the connected pipeline;
for the pipeline with the level of vibration 1, the preventive detection requirements comprise daily inspection of the pipeline, inspection of the pipeline and a pipe clamp and liquid permeation inspection of a pipeline welded junction;
for the pipeline with the level of 2 vibration, the preventive detection requirements comprise daily pipeline inspection, pipeline and pipe clamp inspection and pipeline welded junction liquid penetration inspection, the time interval of two adjacent pipeline and pipe clamp inspections is not more than one fuel cycle period, and the time interval of two adjacent pipeline welded junction liquid penetration inspections is not more than three fuel cycle periods;
to the pipeline that the level is vibration 3 grades, preventive detection requires including pipeline daily inspection, pipeline and pipe strap inspection, pipeline welded junction's radiographic inspection and liquid penetrant inspection, and the time interval of two adjacent pipeline and pipe strap inspections is not more than a fuel cycle, and the time interval of two adjacent pipeline welded junction's radiographic inspection and liquid penetrant inspection is not more than a fuel cycle.
In the hierarchical management system for the small branch pipe of the nuclear power station, provided by the invention, the hierarchical unit is also used for reconstructing the pipeline with the level of vibration 3 and reclassifying the reconstructed pipeline.
The hierarchical management system for the small branch pipe of the nuclear power station provided by the invention further comprises:
and the evaluation unit is used for evaluating the service life of the pipeline which still exceeds the standard after being transformed for many times and has no better optimization scheme.
The method and the system for managing the small branch pipes of the nuclear power station in a grading way have the following beneficial effects: the invention carries out classification according to the vibration and stress conditions of the small branch pipes by combing the management lists of the small branch pipes; different preventive detection requirements (nondestructive testing and pipeline and component inspection) are formulated according to different grades, potential hidden dangers of the small branch pipes are found in time, passive management is changed into active management, the risk of breakage of the small branch pipes can be effectively reduced, and safe operation of the unit is guaranteed.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
fig. 1 is a flowchart of a hierarchical management method for a small branch pipe of a nuclear power plant according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.
Example one
Fig. 1 is a flowchart of a hierarchical management method for a small branch pipe of a nuclear power plant according to an embodiment of the present invention, and as shown in fig. 1, the hierarchical management method for a small branch pipe of a nuclear power plant according to the present invention includes the following steps:
step S1, a grading strategy is formulated according to the vibration parameters, the stress parameters and the importance levels of the small branch pipes;
specifically, in an embodiment of the present invention, the small branch pipes are classified according to their vibration, stress condition, importance, and the like. Through grading, the key attention pipeline can be found out, so that the purpose is achieved, the safety of the small branch pipe is guaranteed, and excessive resources are not required to be input.
Further, in an embodiment of the present invention, the ranking policy includes:
a) the pipeline with the vibration parameter more than or equal to 9mm/s and less than 12mm/s is determined as a vibration 0-level pipeline;
b) the pipeline with the vibration parameter more than or equal to 12mm/s and less than the vibration speed threshold value is determined as a vibration 1-level pipeline;
c) the pipeline with the vibration parameter more than or equal to the vibration speed threshold and the stress parameter less than the stress threshold is determined as a vibration 2-level pipeline;
d) the pipeline with the stress parameter more than or equal to the stress threshold value is determined as a vibration 3-level pipeline;
e) if the importance level of the pipe is associated with a trip-heap condition, the corresponding level of the pipeline is increased by one level.
In this embodiment, the vibration parameter < 9mm/s of the pipeline is in the excellent vibration range, and the detailed management list of the small branch pipe is not included. And for the pipeline related to the condition of jumping the heap, after the grade is determined, adding a grade on the basis of the determined grade. For example, if a small branch pipe related to the condition of jumping from a machine is determined to be a vibrating grade 1 pipe according to the vibration parameter and the stress parameter, the final grade of the small branch pipe should be determined to be grade 2. Further, if a small branch pipe related to the trip-over condition is determined to be a vibrating 3-pipe according to the vibration parameter and the stress parameter, the final grade of the small branch pipe should be determined to be 3 grades.
Step S2, determining the corresponding levels of a plurality of small branch pipes on the small branch pipe management list, and establishing a small branch pipe management database;
specifically, in an embodiment of the present invention, before the small branch management database is established, a small branch management list covering all important pipelines is prepared according to the vibration condition of the pipelines, the post-treatment difficulty of pipeline breakage and the influence of breakage on the unit, and the list includes the following pipelines:
a) the small branch pipe is used for generally surveying the pipeline with high vibration before service;
b) the method mainly focuses on all relevant small branch pipes of equipment, such as a steam turbine body, a steam inlet pipe, an exhaust pipe, a steam extraction pipe, an MSR and the like;
c) jumping the machine and the small branch pipe related to pile jumping;
d) empirical feedback is given to the relevant small branch.
According to the classification strategy formulated in the step S1, the small branch pipes on the small branch pipe management list are classified, so that the passive situation of 'failure-first-aid repair' in the past can be thoroughly changed, the active management of the small branch pipes is realized, the occurrence probability of load shedding or shutdown of a unit caused by temporary processing of the breakage problem of the small branch pipes is reduced, and the reliability of equipment is improved.
And step S3, detecting and managing a plurality of small branches in the small branch management database according to the preventive detection requirements corresponding to different levels.
Specifically, in an embodiment of the present invention, different detection management is performed on small branch pipes of different levels, and hierarchical management can realize effective fusion of the current pipeline state inspection method, and ensure accurate positioning of a problem pipeline through organic combination of vibration monitoring, branch and hanger inspection, and means such as radiation inspection (RT) and liquid Penetration (PT) inspection.
Further, the corresponding preventive detection requirements for different levels of pipelines are as follows:
for the pipeline with the vibration level of 0, the preventive detection requirement comprises daily inspection of the pipeline, and if the pipeline is directly connected with the main steam loop, the liquid permeation inspection of a welded junction of the connected pipeline is also carried out;
for the pipeline with the level of vibration 1, the preventive detection requirements comprise daily inspection of the pipeline, inspection of the pipeline and a pipe clamp and liquid permeation inspection of a pipeline welded junction;
for the pipeline with the level of 2 vibration, the preventive detection requirements comprise daily pipeline inspection, pipeline and pipe clamp inspection and pipeline welded junction liquid penetration inspection, the time interval of two adjacent pipeline and pipe clamp inspections is not more than one fuel cycle period, and the time interval of two adjacent pipeline welded junction liquid penetration inspections is not more than three fuel cycle periods;
to the pipeline that the level is vibration 3 grades, the preventive detection requirement includes that pipeline daily inspection, pipeline and pipe strap inspection, pipeline welded junction's radiographic inspection and liquid penetrant inspection, and the time interval of two adjacent pipeline and pipe strap inspections is not more than a fuel cycle, and the time interval of two adjacent pipeline welded junction's radiographic inspection and liquid penetrant inspection is not more than a fuel cycle.
Further, the inspection range for in-service pipelines is as follows: 0. carrying out liquid permeation inspection on the grade 1 and grade 2 pipelines, wherein the inspection range is all welded junctions before a primary valve; and the 3-level pipeline needs to be subjected to liquid penetration and radiographic inspection, the radiographic inspection range is all welded junctions before the primary valve, and the liquid penetration inspection range is all welded junctions of the whole pipeline. The inspection range of the pipeline pipe clamp is as follows: 1. 2, checking a 2-stage pipeline and a pipe clamp, wherein the checking range is a pipeline and a pipe clamp before a secondary valve; and 3, checking the pipelines and the pipe clamps at the 3 stages, wherein the checking range is all the pipelines and the pipe clamps.
And step S4, modifying the pipeline with the level of vibration 3, and reclassifying the modified pipeline.
Specifically, in one embodiment of the present invention, the staged management of the small legs is not static, but is dynamically managed based on field inspection, processing, retrofit conditions, and vibration data of the pipeline. According to the detection result, the management level of the pipeline with the deteriorated state is improved, and the degradation management is carried out after the field processing meets the corresponding requirements, so that the dynamic regulation and control of the management resources can be realized. It should be noted that, in the specific implementation process, steps S3 and S4 are performed synchronously, and there is no sequential limitation.
And step S5, performing life evaluation on the pipeline which still exceeds the standard after being transformed for many times and has no better optimization scheme.
Specifically, in an embodiment of the present invention, if a part of the pipeline still exceeds the standard after being modified for many times and no better optimization scheme exists, the service life is evaluated, and preventive replacement is performed according to the evaluation result. The application of the grading management strategy can timely find the defects of vulnerable parts such as a small branch pipe support hanger, a welding line and the like and maintain the vulnerable parts at the first time, thereby avoiding the 'operation with diseases' of the pipeline and improving the health level of the pipeline.
Example two
Based on the same invention concept, the invention also provides a hierarchical management system for the small branch pipes of the nuclear power station, which comprises the following steps:
the grading strategy making unit is used for making a grading strategy according to the vibration parameters, the stress parameters and the important grades of the small branch pipes;
specifically, in an embodiment of the present invention, the ranking policy includes:
a) the pipeline with the vibration parameter more than or equal to 9mm/s and less than 12mm/s is determined as a vibration 0-level pipeline;
b) the pipeline with the vibration parameter more than or equal to 12mm/s and less than the vibration speed threshold value is determined as a vibration 1-level pipeline;
c) the pipeline with the vibration parameter more than or equal to the vibration speed threshold and the stress parameter less than the stress threshold is determined as a vibration 2-level pipeline;
d) the pipeline with the stress parameter more than or equal to the stress threshold value is determined as a vibration 3-level pipeline;
e) if the importance level of the pipe is associated with a trip-heap condition, the corresponding level of the pipeline is increased by one level.
The grading unit is used for determining the corresponding grades of the small branch pipes on the small branch pipe management list and establishing a small branch pipe management database;
specifically, in an embodiment of the present invention, before the small branch management database is established, a small branch management list covering all important pipelines is prepared according to the vibration condition of the pipelines, the post-treatment difficulty of pipeline breakage and the influence of breakage on the unit, and the list includes the following pipelines:
a) the small branch pipe is used for generally surveying the pipeline with high vibration before service;
b) the method mainly focuses on all relevant small branch pipes of equipment, such as a steam turbine body, a steam inlet pipe, an exhaust pipe, a steam extraction pipe, an MSR and the like;
c) jumping the machine and the small branch pipe related to pile jumping;
d) empirical feedback is given to the relevant small branch.
The detection management unit is used for detecting and managing a plurality of small branches in the small branch management database according to preventive detection requirements corresponding to different levels;
specifically, in an embodiment of the present invention, for a pipeline with a vibration level of 0, the preventive inspection requirement includes daily inspection of the pipeline, and if the pipeline is directly connected to the main steam loop, the method further includes performing liquid permeation inspection of a welded junction of the connected pipeline;
for the pipeline with the level of vibration 1, the preventive detection requirements comprise daily inspection of the pipeline, inspection of the pipeline and a pipe clamp and liquid permeation inspection of a pipeline welded junction;
for the pipeline with the level of 2 vibration, the preventive detection requirements comprise daily pipeline inspection, pipeline and pipe clamp inspection and pipeline welded junction liquid penetration inspection, the time interval of two adjacent pipeline and pipe clamp inspections is not more than one fuel cycle period, and the time interval of two adjacent pipeline welded junction liquid penetration inspections is not more than three fuel cycle periods;
to the pipeline that the level is vibration 3 grades, the preventive detection requirement includes that pipeline daily inspection, pipeline and pipe strap inspection, pipeline welded junction's radiographic inspection and liquid penetrant inspection, and the time interval of two adjacent pipeline and pipe strap inspections is not more than a fuel cycle, and the time interval of two adjacent pipeline welded junction's radiographic inspection and liquid penetrant inspection is not more than a fuel cycle.
Further, the grading unit is also used for reforming the pipeline with the grade of 3 vibration grades and reclassifying the reformed pipeline.
Further, the system also comprises an evaluation unit which is used for evaluating the service life of the pipeline which still exceeds the standard after being transformed for many times and has no better optimization scheme. And if part of pipelines still exceed the standard after being reconstructed for many times and no better optimization scheme exists, carrying out life evaluation and carrying out preventive replacement according to an evaluation result.
For other details, reference may be made to the first embodiment, which is not described herein again.
Compared with the prior art, the calibration device for the direct current differential transformer type displacement sensor has the following advantages in aspects:
1) the method initiates a small branch pipe hierarchical management strategy: the strategy of vibration grading management of the small branch pipes is put forward for the first time, grading is carried out according to the vibration, stress condition, importance degree and the like of the small branch pipes, the key attention pipelines are found out, the purpose is achieved, the safety of the small branch pipes is guaranteed, and excessive resources are not required to be invested; (ii) a
2) The active management of the small branch pipes is realized: the application of the hierarchical management strategy thoroughly changes the passive situation of 'failure-first-aid repair' in the past, realizes the active management of the small branch pipes, reduces the occurrence probability of load shedding or shutdown of a unit caused by temporary processing of the breakage problem of the small branch pipes, and improves the reliability of equipment;
3) realizing dynamic management of the small branch pipes: the grading management of the small branch pipes is not static, but a dynamic management database of the small branch pipes is established according to the on-site inspection, processing and modification conditions and the vibration data of the pipelines, the management level of the pipelines with deteriorated states is improved, and the on-site processing meets the corresponding requirements and then is subjected to degradation management, so that the dynamic regulation and control of the management resources can be realized;
4) the effective fusion of a plurality of inspection means is realized: the grading management can realize effective fusion of the current pipeline state inspection method, and ensure accurate positioning of the problematic pipeline through organic combination of means such as vibration monitoring, support and hanger inspection, ray inspection (RT), liquid Penetration (PT) inspection and the like;
5) the defects are eliminated and maintained in time: the application of the grading management strategy can timely find the defects of vulnerable parts such as a small branch pipe support hanger, a welding line and the like and maintain the vulnerable parts at the first time, thereby avoiding the 'operation with diseases' of the pipeline and improving the health level of the pipeline.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read Only Memory (ROM), a Random Access Memory (RAM), or the like.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above description refers to various units, and it should be noted that the above description of various units is divided into these units for clarity of illustration. However, in actual implementation, the boundaries of the various elements may be fuzzy. For example, any or all of the functional units herein may share various hardware and/or software elements. Also for example, any and/or all of the functional units herein may be implemented in whole or in part by a common processor executing software instructions. Accordingly, the scope of the present invention is not limited by the mandatory boundaries between the various hardware and/or software elements, unless explicitly claimed otherwise.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A hierarchical management method for small branch pipes of a nuclear power station is characterized by comprising the following steps:
step S1, a grading strategy is formulated according to the vibration parameters, the stress parameters and the importance levels of the small branch pipes;
step S2, determining the corresponding levels of a plurality of small branch pipes on the small branch pipe management list, and establishing a small branch pipe management database;
and step S3, detecting and managing a plurality of small branches in the small branch management database according to the preventive detection requirements corresponding to different levels.
2. The hierarchical management method for nuclear power plant small branch pipes according to claim 1, wherein in step S1, the hierarchical policy includes:
a) the pipeline with the vibration parameter more than or equal to 9mm/s and less than 12mm/s is determined as a vibration 0-level pipeline;
b) the pipeline with the vibration parameter more than or equal to 12mm/s and less than the vibration speed threshold value is determined as a vibration 1-level pipeline;
c) the pipeline with the vibration parameter more than or equal to the vibration speed threshold and the stress parameter less than the stress threshold is determined as a vibration 2-level pipeline;
d) the pipeline with the stress parameter more than or equal to the stress threshold value is determined as a vibration 3-level pipeline;
e) if the importance level of the pipe is associated with a trip-heap condition, the corresponding level of the pipeline is increased by one level.
3. The hierarchical management method for nuclear power plant small branch pipes according to claim 2, characterized in that in step S3:
for the pipeline with the vibration level of 0, the preventive detection requirement comprises daily inspection of the pipeline, and if the pipeline is directly connected with the main steam loop, the liquid permeation inspection of a welded junction of the connected pipeline is also carried out;
for the pipeline with the level of vibration 1, the preventive detection requirements comprise daily inspection of the pipeline, inspection of the pipeline and a pipe clamp and liquid permeation inspection of a pipeline welded junction;
for the pipeline with the level of 2 vibration, the preventive detection requirements comprise daily pipeline inspection, pipeline and pipe clamp inspection and pipeline welded junction liquid penetration inspection, the time interval of two adjacent pipeline and pipe clamp inspections is not more than one fuel cycle period, and the time interval of two adjacent pipeline welded junction liquid penetration inspections is not more than three fuel cycle periods;
to the pipeline that the level is vibration 3 grades, the preventive detection requirement includes that pipeline daily inspection, pipeline and pipe strap inspection, pipeline welded junction's radiographic inspection and liquid penetrant inspection, and the time interval of two adjacent pipeline and pipe strap inspections is not more than a fuel cycle, and the time interval of two adjacent pipeline welded junction's radiographic inspection and liquid penetrant inspection is not more than a fuel cycle.
4. The hierarchical management method for the small branch pipes in the nuclear power plant as set forth in claim 2, further comprising:
and step S4, modifying the pipeline with the level of vibration 3, and reclassifying the modified pipeline.
5. The hierarchical management method for the small branch pipes of the nuclear power plant as set forth in claim 4, further comprising:
and step S5, performing life evaluation on the pipeline which still exceeds the standard after being transformed for many times and has no better optimization scheme.
6. A hierarchical management system of nuclear power station small branch pipes is characterized by comprising:
the grading strategy making unit is used for making a grading strategy according to the vibration parameters, the stress parameters and the important grades of the small branch pipes;
the grading unit is used for determining the corresponding grades of the small branch pipes on the small branch pipe management list and establishing a small branch pipe management database;
and the detection management unit is used for detecting and managing a plurality of small branches in the small branch management database according to the preventive detection requirements corresponding to different levels.
7. The nuclear power plant small branch pipe grading management system according to claim 6, wherein the grading strategy comprises:
a) the pipeline with the vibration parameter more than or equal to 9mm/s and less than 12mm/s is determined as a vibration 0-level pipeline;
b) the pipeline with the vibration parameter more than or equal to 12mm/s and less than the vibration speed threshold value is determined as a vibration 1-level pipeline;
c) the pipeline with the vibration parameter more than or equal to the vibration speed threshold and the stress parameter less than the stress threshold is determined as a vibration 2-level pipeline;
d) the pipeline with the stress parameter more than or equal to the stress threshold value is determined as a vibration 3-level pipeline;
e) if the importance level of the pipe is associated with a trip-heap condition, the corresponding level of the pipeline is increased by one level.
8. The hierarchical management system for the small branch pipes of the nuclear power plant according to claim 7, wherein for the pipeline with the level of vibration 0, the preventive detection requirement comprises daily inspection of the pipeline, and if the pipeline is directly connected with the main steam loop, the system further comprises liquid permeation inspection of the welded junctions of the connected pipelines;
for the pipeline with the level of vibration 1, the preventive detection requirements comprise daily inspection of the pipeline, inspection of the pipeline and a pipe clamp and liquid permeation inspection of a pipeline welded junction;
for the pipeline with the level of 2 vibration, the preventive detection requirements comprise daily pipeline inspection, pipeline and pipe clamp inspection and pipeline welded junction liquid penetration inspection, the time interval of two adjacent pipeline and pipe clamp inspections is not more than one fuel cycle period, and the time interval of two adjacent pipeline welded junction liquid penetration inspections is not more than three fuel cycle periods;
to the pipeline that the level is vibration 3 grades, the preventive detection requirement includes that pipeline daily inspection, pipeline and pipe strap inspection, pipeline welded junction's radiographic inspection and liquid penetrant inspection, and the time interval of two adjacent pipeline and pipe strap inspections is not more than a fuel cycle, and the time interval of two adjacent pipeline welded junction's radiographic inspection and liquid penetrant inspection is not more than a fuel cycle.
9. The nuclear power plant small branch pipe grading management system according to claim 7, wherein the grading unit is further configured to modify the pipeline with a grade of 3 vibration, and reclassify the modified pipeline.
10. The hierarchical management system for the small branch pipes of the nuclear power plant according to claim 9, further comprising:
and the evaluation unit is used for evaluating the service life of the pipeline which still exceeds the standard after being transformed for many times and has no better optimization scheme.
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