CN107766621B - Nuclear power station overhead HDPE (high-density polyethylene) pipeline functionality verification method and system - Google Patents
Nuclear power station overhead HDPE (high-density polyethylene) pipeline functionality verification method and system Download PDFInfo
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Abstract
The invention discloses a nuclear power station overhead pipeline functionality verification method, which comprises the following steps: building a simulation model of a pipeline system adopting high-density polyethylene pipes; simulating the response of the pipeline system under different external conditions through the simulation model; and when the response meets a preset standard, determining that the pipeline in the pipeline system can perform the function required by the system design. The invention also discloses a system for verifying the functionality of the nuclear power station overhead pipeline. The invention has good economy, timeliness and universality.
Description
Technical Field
The invention relates to the technical field of nuclear power, in particular to a method and a system for verifying functionality of an overhead pipeline of a HDPE nuclear power station.
Background
The functional evaluation of the pipeline is an important means for proving whether the pipeline can realize the function of system design. In the design of nuclear power plant piping, it is important to demonstrate whether the piping can perform the functions required by system design, and the important content of nuclear power plant piping evaluation and the important guarantee of nuclear power safety.
High Density Polyethylene (HDPE) materials have achieved excellent results in conventional industrial pipe design with their excellent corrosion and antimicrobial material properties, and have also become one of the ideal alternatives for metal pipes in part of nuclear power plant systems. However, the mechanical properties of the high-density polyethylene material are greatly different from those of the metal material, so that the method for evaluating the functionality of the metal pipeline cannot be applied to the high-density polyethylene overhead pipeline. Therefore, the test method of building the pipeline system in real objects can only be adopted to verify whether the pipeline can execute the functions required by the system design.
Although the verification method is the most direct functional verification method, the manufacturing of the pipeline and the construction, testing and maintenance of the system all require high operation cost; one-time test can only aim at functional verification of a specified object under a specified working condition, and the universality is poor; the long work period is needed from the preparation of the test to the development of the test to the post-processing of the test data, and the test proves that the high-density polyethylene pipeline takes long time to have the functionality; in the test verification, the sensitivity analysis of a certain specific parameter is difficult to execute by fixing other parameters, and the parameter variation range is limited.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method and a system for verifying the functionality of an overhead HDPE pipeline of a nuclear power station, and the method and the system have good economy, timeliness and universality.
The technical scheme provided by the invention for the technical problem is as follows:
in one aspect, the invention provides a functionality verification method for an overhead HDPE (high-Density polyethylene) pipeline of a nuclear power station, which comprises the following steps:
building a simulation model of a pipeline system adopting high-density polyethylene pipes;
simulating the response of the pipeline system under different external conditions through the simulation model;
and when the response meets a preset standard, determining that the pipeline in the pipeline system can perform the function required by the system design.
Further, the building of the simulation model of the pipeline system adopting the high-density polyethylene pipe specifically comprises:
acquiring material information of a high-density polyethylene pipe and structural performance information of a pipeline system adopting the high-density polyethylene pipe;
building a simulation model of the pipeline system according to the material information and the structural performance information;
wherein the material information of the high density polyethylene pipe comprises Young's modulus, Poisson's ratio, coefficient of thermal expansion, yield strength, ultimate strength and fatigue characteristics;
the structural performance information of the pipeline system comprises geometric information, material types and section size information of pipelines, pipe fittings and valves, support restraint positions and functions on the pipelines, interface information of the pipelines and equipment, sizes, masses and gravity center positions of the valves in the pipelines, temperature and pressure of the pipeline system under normal operation conditions, dynamic loads borne by the pipeline system and load information of the pipeline system under various operation conditions.
Further, the building a simulation model of the pipeline system according to the material information and the structural performance information specifically includes:
establishing nodes of the model according to the geometric information of the pipeline system;
selecting corresponding unit types according to related information of pipelines, pipe fittings, valves and equipment of the pipeline system, and establishing units of the model according to the unit types;
selecting the material, section attribute, flexibility coefficient and stress index of the unit according to the material information of the high-density polyethylene pipe and the material types and section size information of the pipeline, the pipe fitting and the valve;
according to the restraint position and the function of the bracket on the pipeline, the support rigidity corresponding to the restraint direction on the pipeline is defined aiming at different loads;
and building a simulation model of the pipeline system according to the nodes, the selected units and the defined information.
Further, the simulating the response of the pipeline system under different external conditions by the simulation model specifically includes:
modifying the Young's modulus and Poisson's ratio of the high density polyethylene pipe in the simulation model to simulate the life of the piping system;
and simulating the response of the pipeline system under different external conditions at different service lives through the simulation model.
Further, the external conditions include self-weight, thermal expansion and dynamic load;
the simulation of the response of the pipeline system under different external conditions at different service lives by the simulation model specifically includes:
applying an acceleration of-1 g to the simulation model to simulate the effect of dead weight;
giving corresponding temperature to the simulation model to simulate the thermal expansion effect;
simulating the dynamic load action by adopting a modal superposition method and the dynamic load born by the pipeline system;
acquiring the pipeline stress sigma of the pipeline system under the action of self weight in different service livesSelf-weightAxial force F of the pipe under the action of self-weight and thermal expansionSelf weight + thermal expansionPipe stress sigma under the action of dead weight and dynamic loadDead weight + dynamic loadAnd the pipe axial force F under the action of dead weight, thermal expansion and dynamic loadDead weight + thermal expansion + dynamic load. Further, the preset criteria include a first criterion and a second criterion;
when the response meets a preset standard, determining that the pipeline in the pipeline system can perform a function required by system design specifically comprises:
simulating and detecting whether the pipeline system respectively meets three groups of primary selection conditions under the operation working condition;
if all the three sets of initial selection conditions are met, detecting whether the response meets the first standard, and judging that the pipeline in the pipeline system can execute the function required by system design when the response meets the first standard;
if the three sets of initial selection conditions are not all met, detecting whether the response meets the second standard, and judging that the pipeline in the pipeline system can execute the function required by system design when the response meets the second standard.
Further, the simulation detects whether pipe-line system satisfies three sets of primary election conditions respectively under operating condition, specifically includes:
simulating and detecting whether the pipeline system has a plunger flowing water hammer under each operating condition; if no plunger flowing water hammer exists under all the operating conditions, judging that the primary selection condition is met, otherwise, judging that the primary selection condition is not met;
simulating and detecting whether the internal pressure of the pipeline system is greater than the external pressure under each operating condition; if so, judging that the primary selection condition is met, otherwise, judging that the primary selection condition is not met;
simulating and detecting whether the dynamic loads borne by the pipeline system under each operating condition are all alternating dynamic loads; if yes, judging that the initial selection condition is met, otherwise, judging that the initial selection condition is not met.
Further, the detecting whether the response meets the first criterion and determining that the pipe in the pipe system can perform the function required by the system design when the response meets the first criterion specifically includes:
detecting the pipe stress sigmaSelf-weightWhether less than 0.25Sy, the pipe axial force FSelf weight + thermal expansionWhether less than 0.5 times the critical buckling limit load of the pipeline, the pipeline stress sigmaDead weight + dynamic loadWhether less than 0.32Sy and the pipe axial force FDead weight + thermal expansion + dynamic loadWhether the critical instability limit load of the pipeline is less than 0.6 times;
if yes, the response is judged to meet the first standard, and the pipeline in the pipeline system can execute the function required by system design.
Further, the detecting whether the response meets the second criterion and determining that the pipe in the pipe system can perform the function required by the system design when the response meets the second criterion specifically includes:
detecting the pipe stress sigmaDead weight + dynamic loadWhether less than 0.25Sy and said pipe axial force FDead weight + thermal expansion + dynamic loadWhether the critical instability limit load of the pipeline is less than 0.5 times;
if yes, the response is judged to meet the second standard, and the pipeline in the pipeline system can execute the function required by system design.
In another aspect, the present invention provides a system for performing verification by using the above verification method for functionality of an overhead pipeline of a nuclear power plant, where the system includes:
the model building module is used for building a simulation model of the pipeline system adopting the high-density polyethylene pipe;
the response simulation module is used for simulating the response of the pipeline system under different external conditions through the simulation model; and the number of the first and second groups,
and the verification module is used for judging that the pipeline in the pipeline system can execute the function required by the system design when the response meets the preset standard.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the method comprises the steps of building a simulation model of the pipeline system, wherein the pipeline in the pipeline system is made of high-density polyethylene, simulating the pipeline system by using the simulation model, obtaining responses of the pipeline system under different external conditions, detecting the responses of the pipeline system, and if the responses meet preset standards, indicating that the pipeline in the pipeline system meets performance requirements and executing functions required by system design.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for verifying functionality of an overhead HDPE pipe in a nuclear power plant according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a functionality verification system for an overhead HDPE pipe of a nuclear power plant according to the second embodiment of the present invention.
Detailed Description
In order to solve the technical problems of poor economy, poor universality, long time consumption, high difficulty in parameter sensitivity analysis and the like in the prior art, the invention aims to provide a method for verifying the functionality of an overhead pipeline of a nuclear power station, which has the core idea that: the method comprises the steps of building a simulation model of the pipeline system adopting the high-density polyethylene pipe, simulating the pipeline system by adopting the simulation model, obtaining responses of the pipeline system under different external conditions, detecting the responses of the pipeline system, and if the responses meet preset standards, indicating that the pipeline in the pipeline system meets performance requirements and executing functions required by system design. The method has good economy and universality, short time consumption of simulation verification and convenience for carrying out parameter sensitivity analysis.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
The embodiment of the invention provides a method for verifying functionality of an overhead HDPE (high-density polyethylene) pipeline of a nuclear power station, and the method comprises the following steps of:
s1, building a simulation model of the pipeline system adopting the high-density polyethylene pipe;
s2, simulating the response of the pipeline system under different external conditions through the simulation model;
and S3, when the response meets the preset standard, judging that the pipeline in the pipeline system can execute the function required by the system design.
Further, in step S1, the building a simulation model of a piping system using high-density polyethylene pipes specifically includes:
acquiring material information of a high-density polyethylene pipe and structural performance information of a pipeline system adopting the high-density polyethylene pipe;
building a simulation model of the pipeline system according to the material information and the structural performance information;
wherein the material information of the high density polyethylene pipe comprises Young's modulus, Poisson's ratio, coefficient of thermal expansion, yield strength, ultimate strength and fatigue characteristics;
it should be noted that the simulation model of the management system is built based on the fundamental principle of the finite element, relying on the material information of the high-density polyethylene, the finite element software and the data processing tool for simulation and verification. Wherein, the material information is the basic mechanical property parameters of the used high-density polyethylene material extracted from the material supplier or material specification, and the parameters comprise Young modulus, Poisson's ratio, thermal expansion coefficient, yield strength, ultimate strength, fatigue property and the like. Unlike metal pipes, these material parameters include not only the change in performance parameters with temperature, but also the change in performance parameters with load duration. And inputting the material parameters into finite element software in a self-defined mode.
General or special finite element software is selected as a simulation platform. The selected software must have the following functions: a) the material parameters can be customized, including Young modulus, Poisson ratio, thermal expansion coefficient, yield strength, ultimate strength, fatigue property and the like; b) a unit having a conduit and a fitting; c) modal analysis can be carried out, and modal analysis results can be extracted and viewed; d) the device is provided with a solver for static analysis and dynamic analysis, and can provide and view analysis results. The finite element software available as a simulation platform includes ANSYS, PIPESTRESS, CASTER II, etc.
In addition, software is selected as a data processing tool for simulation verification, and the software can be selected from excel, matlab and the like.
Further, structural performance information of the piping system is collected and collated.
The structural performance information of the piping system includes: geometric information; material type and cross-sectional dimension information for pipes, tubes and valves; the position and function of the bracket constraint on the pipeline; interface information of the pipeline and the equipment, if the on-line equipment exists, drawing and weight of the equipment need to be provided; the size, the mass and the gravity center position of the valve in the piping system need to provide the specific position and the fixing mode for fixing the valve if the valve is fixed on the floor; temperature and pressure of the piping system under normal operating conditions; dynamic loads borne by the piping system, such as seismic acceleration floor response spectrum loads; and load information of the pipeline system under other operation conditions.
Further, the building a simulation model of the pipeline system according to the material information and the structural performance information specifically includes:
establishing nodes of the model according to the geometric information of the pipeline system;
selecting corresponding unit types according to related information of pipelines, pipe fittings, valves and equipment of the pipeline system, and establishing units of the model according to the unit types;
selecting the material, section attribute, flexibility coefficient and stress index of the unit according to the material information of the high-density polyethylene pipe and the material types and section size information of the pipeline, the pipe fitting and the valve;
according to the restraint position and the function of the bracket on the pipeline, the support rigidity corresponding to the restraint direction on the pipeline is defined aiming at different loads;
and building a simulation model of the pipeline system according to the nodes, the selected units and the defined information.
It should be noted that the establishment of the simulation model is mainly carried out by means of finite element software selected by a simulation platform. Through the steps, the built simulation model can reflect the mechanical behavior and performance of the pipeline system.
Further, after the building of the simulation model of the pipeline system, the method further includes:
detecting whether the ratio of the outer diameter to the wall thickness of the pipeline in the simulation model is less than or equal to 50; if not, the wall thickness of the pipeline is thickened, and the ratio of the outer diameter of the pipeline to the wall thickness is smaller than or equal to 50.
Further, the simulating the response of the pipeline system under different external conditions by the simulation model specifically includes:
modifying the Young's modulus and Poisson's ratio of the high density polyethylene pipe in the simulation model to simulate the life of the piping system;
and simulating the response of the pipeline system under different external conditions at different service lives through the simulation model.
It should be noted that, according to the temperature of the normal working condition and the design life of the design object, the young modulus, poisson's ratio, thermal expansion coefficient, etc. of the high-density polyethylene pipe in the simulation model are modified to reflect the material properties at the beginning of the design life and at the end of the design life. And simulating material performance parameters at each stage of the service life by interpolation. During simulation, the responses of the pipeline system under different external conditions are acquired at different stages of the design life.
Further, the external conditions include self-weight, thermal expansion and dynamic load;
the simulation of the response of the pipeline system under different external conditions at different service lives by the simulation model specifically includes:
applying an acceleration of-1 g to the simulation model to simulate the effect of dead weight;
giving corresponding temperature to the simulation model to simulate the thermal expansion effect;
simulating the dynamic load action by adopting a modal superposition method and the dynamic load born by the pipeline system;
and acquiring the first pipeline stress of the pipeline system under the action of the dead weight, the first pipeline axial force under the action of the dead weight and thermal expansion, the second pipeline stress under the action of the dead weight and dynamic load and the second pipeline axial force under the action of the dead weight, thermal expansion and dynamic load in different service lives.
It should be noted that an acceleration of-1 g is applied to the simulation model to simulate the response of the piping system due to its own weight. And according to the temperature and the pressure of the normal working condition, corresponding temperature and pressure are given in the simulation model for simulating the response of the pipeline system caused by the temperature and the internal pressure. And simulating the response of the pipeline system under the action of the dynamic load by adopting a response spectrum (such as a seismic floor response spectrum) of the dynamic load and a mode stacking method.
Selecting a post-processing tool of finite element software through a simulation platform, respectively extracting the response of the dead weight and the earthquake caused at different stages of the design life, and merging the response into excel to sort out the following groups of data:
pipe stress in pipe systems under the effect of their own weight, i.e. pipe stress sigma, at different stages of the design lifeSelf-weight(ii) a Pipeline axial force in the pipeline system under the action of dead weight and thermal expansion, namely pipeline axial force F at different stages of design lifeSelf weight + thermal expansion；
Pipe stress in the pipe system under the effect of dead weight and dynamic load, i.e. pipe stress sigma, at different stages of the design lifeDead weight + dynamic load；
Pipe axial forces in the pipe system under the effects of deadweight, thermal expansion and dynamic loading, i.e. pipe stresses F, at various stages of the design lifeDead weight + thermal expansion + dynamic load。
Further, the preset criteria include a first criterion and a second criterion;
when the response meets a preset standard, determining that the pipeline in the pipeline system can perform a function required by system design specifically comprises:
simulating and detecting whether the pipeline system respectively meets three groups of primary selection conditions under the operation working condition;
if all the three sets of initial selection conditions are met, detecting whether the response meets the first standard, and judging that the pipeline in the pipeline system can execute the function required by system design when the response meets the first standard;
if the three sets of initial selection conditions are not all met, detecting whether the response meets the second standard, and judging that the pipeline in the pipeline system can execute the function required by system design when the response meets the second standard.
Further, the simulation detects whether pipe-line system satisfies three sets of primary election conditions respectively under operating condition, specifically includes:
simulating and detecting whether the pipeline system has a plunger flowing water hammer under each operating condition; if no plunger flowing water hammer exists under all the operating conditions, judging that the primary selection condition is met, otherwise, judging that the primary selection condition is not met;
simulating and detecting whether the internal pressure of the pipeline system is greater than the external pressure under each operating condition; if so, judging that the primary selection condition is met, otherwise, judging that the primary selection condition is not met;
simulating and detecting whether the dynamic loads borne by the pipeline system under each operating condition are all alternating dynamic loads; if yes, judging that the initial selection condition is met, otherwise, judging that the initial selection condition is not met.
It should be noted that, the three sets of initial selection conditions are respectively that the pipeline system has no plunger flowing water hammer under each operation condition, the internal pressure is greater than the external pressure, and the borne dynamic load is an alternating dynamic load. According to the load information of the pipeline system under each operating condition, simulating and detecting that no plunger running water hammer exists in the pipeline system under each operating condition, and meeting a first group of primary selection conditions; simulating to detect that the internal pressure of the pipeline system is greater than the external pressure under each operating condition, and meeting a second group of primary selection conditions; and simulating to detect that the dynamic loads possibly borne by the pipeline system under each operating condition are all alternating dynamic loads, and then meeting the third group of initial selection conditions. If all the three groups of initial selection conditions are met, evaluating the response of the pipeline system by using a first standard; and if one group of initial selection conditions are not met, selecting a second standard to evaluate the response of the pipeline system.
Further, the detecting whether the response meets the first criterion and determining that the pipe in the pipe system can perform the function required by the system design when the response meets the first criterion specifically includes:
detecting the pipe stress sigmaSelf-weightWhether less than 0.25Sy, the pipe axial force FSelf weight + thermal expansionWhether less than 0.5 times the critical buckling limit load of the pipeline, the pipeline stress sigmaDead weight + dynamic loadWhether less than 0.32Sy and the pipe axial force FDead weight + thermal expansion + dynamic loadWhether the critical instability limit load of the pipeline is less than 0.6 times;
if yes, the response is judged to meet the first standard, and the pipeline in the pipeline system can execute the function required by system design.
It should be noted that the first criterion is the pipe stress σ in the pipe system under the effect of its own weight at different stages of the design lifeSelf-weightMust be less than 0.25Sy (Sy is the yield strength of the material), and the pipe axial force F in the pipe system under the action of self weight and thermal expansionSelf weight + thermal expansionThe critical instability limit load of the pipeline is less than 0.5 time; pipe stress sigma in a pipe system under the action of dead weight and dynamic load at different stages of design lifeDead weight + dynamic loadMust be less than 0.32Sy, and the pipe axial force F in the pipe system under the action of dead weight, thermal expansion and dynamic loadDead weight + thermal expansion + dynamic loadMust be less than 0.6 times the critical buckling limit load of the pipeline.
Further, the detecting whether the response meets the second criterion and determining that the pipe in the pipe system can perform the function required by the system design when the response meets the second criterion specifically includes:
detecting the pipe stress sigmaDead weight + dynamic loadWhether less than 0.25Sy and said pipe axial force FDead weight + thermal expansion + dynamic loadWhether the critical instability limit load of the pipeline is less than 0.5 times;
if yes, the response is judged to meet the second standard, and the pipeline in the pipeline system can execute the function required by system design.
It should be noted that the second criterion is the pipe stress σ in the pipe system under the effect of the dead weight and the dynamic load at different stages of the design lifeDead weight + dynamic loadMust be less than 0.25Sy, and the pipe axial force F in the pipe system under the action of dead weight, thermal expansion and dynamic loadDead weight + thermal expansion + dynamic loadMust be less than 0.5 times the critical buckling limit load of the pipeline.
The embodiment of the invention builds a simulation model of the pipeline system, wherein the pipeline in the pipeline system is made of high-density polyethylene, the simulation model is adopted to simulate the pipeline system, the response of the pipeline system under different external conditions is obtained to detect the response of the pipeline system, if the response meets the preset standard, the pipeline in the pipeline system meets the performance requirement, and the function required by system design can be executed, so that the pipeline system has good economy and universality, the simulation verification time consumption is short, and the parameter sensitivity analysis is convenient to develop.
Example two
The embodiment of the invention provides a nuclear power station overhead HDPE (high-Density polyethylene) pipeline functionality verification system, which can realize all the processes of the nuclear power station overhead pipeline functionality verification method, and with reference to fig. 2, the system comprises:
the model building module 1 is used for building a simulation model of a pipeline system adopting high-density polyethylene pipes;
the response simulation module 2 is used for simulating the response of the pipeline system under different external conditions through the simulation model; and the number of the first and second groups,
and the verification module 3 is used for judging that the pipeline in the pipeline system can execute the function required by the system design when the response meets the preset standard.
The embodiment of the invention builds a simulation model of the pipeline system, wherein the pipeline in the pipeline system is made of high-density polyethylene, the simulation model is adopted to simulate the pipeline system, the response of the pipeline system under different external conditions is obtained to detect the response of the pipeline system, if the response meets the preset standard, the pipeline in the pipeline system meets the performance requirement, and the function required by system design can be executed, so that the pipeline system has good economy and universality, the simulation verification time consumption is short, and the parameter sensitivity analysis is convenient to develop.
In summary, the invention provides a method and a system for verifying the functionality of an overhead pipeline of a nuclear power plant, which have better practical effects: the simulation model and the system for the high-density polyethylene overhead pipeline functional verification are provided for the first time, and the domestic blank is filled; the provided method and system for verifying the functionality of the high-density polyethylene overhead pipeline breaks through the technical bottleneck of applying the high-density polyethylene material pipeline to the nuclear power station, and is successfully applied to the project of modifying the high-density polyethylene overhead pipeline; compared with the material object test method in the prior art, the high-density polyethylene overhead pipeline functional verification method and system have the advantages of good economy and universality, short simulation test time consumption and convenience in carrying out parameter sensitivity analysis.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A nuclear power station overhead pipeline functionality verification method is characterized by comprising the following steps:
acquiring material information of a high-density polyethylene pipe and structural performance information of a pipeline system adopting the high-density polyethylene pipe; building a simulation model of the pipeline system according to the material information and the structural performance information; wherein the material information of the high density polyethylene pipe comprises Young's modulus, Poisson's ratio, coefficient of thermal expansion, yield strength, ultimate strength and fatigue characteristics; the structural performance information of the pipeline system comprises geometric information, material types and section size information of pipelines, pipe fittings and valves, support restraint positions and functions on the pipelines, interface information of the pipelines and equipment, the size, the mass and the gravity center position of the valves in the pipelines, the temperature and the pressure of the pipeline system under normal operation conditions, dynamic loads borne by the pipeline system and load information of the pipeline system under various operation conditions;
modifying the Young's modulus and Poisson's ratio of the high density polyethylene pipe in the simulation model to simulate the life of the piping system; applying an acceleration of-1 g to the simulation model to simulate the effect of dead weight; giving corresponding temperature to the simulation model to simulate the thermal expansion effect; simulating the dynamic load action by adopting a modal superposition method and the dynamic load born by the pipeline system; acquiring the pipeline stress sigma of the pipeline system under the action of self weight in different service livesSelf-weightAxial force F of the pipe under the action of self-weight and thermal expansionSelf weight + thermal expansionPipe stress sigma under the action of dead weight and dynamic loadDead weight + dynamic loadAnd the pipe axial force F under the action of dead weight, thermal expansion and dynamic loadDead weight + thermal expansion + dynamic load；
Simulating and detecting whether the pipeline system respectively meets three groups of primary selection conditions under the operation working condition; if all the three sets of initial selection conditions are met, detecting whether a response meets a first standard, and judging that the pipeline in the pipeline system can execute the function required by system design when the response meets the first standard; if the three sets of initial selection conditions are not all met, detecting whether a response meets a second standard, and judging that the pipeline in the pipeline system can execute the function required by system design when the response meets the second standard;
whether the detection response meets a first standard or not and when the response meets the first standard, the pipeline in the pipeline system is judged to be capable of executing functions required by system design, and the method specifically comprises the following steps:
detecting the pipe stress sigmaSelf-weightWhether the stress is less than 0.25Sy, Sy is the yield strength of the material, and the pipeline axial force FSelf weight + thermal expansionWhether less than 0.5 times the critical buckling limit load of the pipeline, the pipeline stress sigmaDead weight + dynamic loadWhether less than 0.32Sy and the pipe axial force FDead weight + thermal expansion + dynamic loadWhether the critical instability limit load of the pipeline is less than 0.6 times;
if yes, judging that the response meets the first standard, and enabling the pipeline in the pipeline system to execute the function required by system design;
whether the detection response meets a second standard or not and when the response meets the second standard, the pipeline in the pipeline system is judged to be capable of executing functions required by system design, and the method specifically comprises the following steps:
detecting the pipe stress sigmaDead weight + dynamic loadWhether less than 0.25Sy and said pipe axial force FDead weight + thermal expansion + dynamic loadWhether the critical instability limit load of the pipeline is less than 0.5 times;
if yes, the response is judged to meet the second standard, and the pipeline in the pipeline system can execute the function required by system design.
2. The nuclear power plant overhead pipeline functionality verification method as claimed in claim 1, wherein the building of the simulation model of the pipeline system according to the material information and the structural performance information specifically includes:
establishing nodes of the model according to the geometric information of the pipeline system;
selecting corresponding unit types according to related information of pipelines, pipe fittings, valves and equipment of the pipeline system, and establishing units of the model according to the unit types;
selecting the material, section attribute, flexibility coefficient and stress index of the unit according to the material information of the high-density polyethylene pipe and the material types and section size information of the pipeline, the pipe fitting and the valve;
according to the restraint position and the function of the bracket on the pipeline, the support rigidity corresponding to the restraint direction on the pipeline is defined aiming at different loads;
and building a simulation model of the pipeline system according to the nodes, the selected units and the defined information.
3. The nuclear power plant overhead pipeline functionality verification method as claimed in claim 1, wherein the simulation detection of whether the pipeline system respectively meets three sets of preliminary selection conditions under the operating condition specifically includes:
simulating and detecting whether the pipeline system has a plunger flowing water hammer under each operating condition; if no plunger flowing water hammer exists under all the operating conditions, judging that the primary selection condition is met, otherwise, judging that the primary selection condition is not met;
simulating and detecting whether the internal pressure of the pipeline system is greater than the external pressure under each operating condition; if so, judging that the primary selection condition is met, otherwise, judging that the primary selection condition is not met;
simulating and detecting whether the dynamic loads borne by the pipeline system under each operating condition are all alternating dynamic loads; if yes, judging that the initial selection condition is met, otherwise, judging that the initial selection condition is not met.
4. A system for verification using the nuclear power plant overhead pipeline functionality verification method as claimed in any one of claims 1 to 3, the system comprising:
the model building module is used for building a simulation model of the pipeline system adopting the high-density polyethylene pipe;
the response simulation module is used for simulating the response of the pipeline system under different external conditions through the simulation model; and the number of the first and second groups,
and the verification module is used for judging that the pipeline in the pipeline system can execute the function required by the system design when the response meets the preset standard.
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| CN110472846B (en) * | 2019-07-30 | 2021-05-28 | 西安交通大学 | Optimal estimation and uncertainty method for thermal hydraulic safety analysis of nuclear power plant |
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| CN106126847A (en) * | 2016-06-30 | 2016-11-16 | 中国石油天然气集团公司 | A kind of determination method of thermoplasticity reinforced composite pipe road design ratio |
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