CN107358983B - The method for monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence - Google Patents
The method for monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence Download PDFInfo
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Abstract
The invention discloses a kind of methods for monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence, it is the following steps are included: a certain magnetic parameter for monitoring position of the reactor pressure vessel steel of S1, real-time monitoring nuclear power station during normal operation, magnetic parameter are magnetic susceptibility χ, remanent magnetization MRWith coercivity HCIn any one；S2, the neutron irradiation damage fluence Φ that reactor pressure vessel is calculated based on the magnetic parameter measured in real time.For the prior art, the present invention monitor nuclear power plant reactor pressure vessel neutron irradiation damage fluence method can in real time, follow-on test nuclear power station operation during reactor pressure vessel steel magnetic parameter, the neutron spoke damage fluence data for obtaining reactor pressure vessel steel are calculated in real time, and can monitor the neutron irradiation damage fluence of the multiple positions of reactor pressure vessel simultaneously.
Description
Technical field
The invention belongs to nuclear power fields, it is more particularly related to a kind of monitoring nuclear power plant reactor pressure vessel
The method of neutron irradiation damage fluence.
Background technique
Reactor pressure vessel is one of large scale equipment the most key in nuclear island of nuclear power station, and major function is to contain and prop up
Hold the steel pressure resistant vessel of reactor core nuclear fuel assembly, control assembly, in-pile component and reactor coolant.Its long service is in strong
Irradiation, high temperature, hyperbaric environment, wherein neutron irradiation damage (is embodied in during reactor pressure vessel steel radiation embrittlement
Intensity increases, toughness declines) it is one of its dominant failure mode.
In order to ensure the safety of reactor pressure vessel operation, it is normal for being monitored its irradiation damage fluence with evaluation
One of method.Specific implementation step is as follows: (1) before the operation of nuclear power station first fuel loading, in reactor pressure vessel
4 to 6 irradiation monitoring pipes are installed in portion, and fission dose detector is loaded in every irradiation monitoring pipe, generally includes U238And Np237Two
Detecting element, is then encapsulated into titanium box, titanium box is reloaded into boron nitride box, then nitrogen by kind fission dosage detecting element respectively
Change boron box to be integrally packed into irradiation monitoring pipe again.(2) plan is extracted according to the irradiation monitoring pipe that irradiation outline is formulated, utilized
Nuclear power station reloads the chance of maintenance, irradiation monitoring pipe is periodically extracted from reactor pressure vessel, then according to radiation protection
It is required that the hot cell mechanism of fixed point, fission dose detector is taken out in cutting dissection, then right in hot cell for long-distance transport after packaging
Analytical test is carried out in variation of its ingredient etc., and then calculates and obtain the neutron irradiation damage note that fission dose detector is received
Amount.(3) according to the lead factor of irradiation monitoring pipe, conversion obtains the neutron irradiation damage fluence of reactor pressure vessel ontology,
And then Subsequent secure appraisal is carried out to the operation of reactor pressure vessel.
The shortcomings that existing method, is summarized as follows:
1) fission dose detector (U238And Np237) belonging to radioactive source, production, transport, sale etc. are required to professional money
Matter, purchase cost is very high, subsequent transportation, according to etc. it is also extremely troublesome；
2) the irradiation damage fluence that cannot directly obtain reactor pressure vessel ontology, need to be converted by lead factor, be deposited
In certain error, when lead factor is larger, the error is further obvious, the representative of the neutron irradiation damage fluence obtained at that time
Property is poor；
3) due to the quantity of irradiation monitoring pipe it is very limited (usually only 4~6, and must first fuel loading operation before
Disposable loading finishes, and the prior art is supplemented installation irradiation monitoring pipe, the following nuclear power after can not realizing operation a period of time
The problem is further prominent when station is lengthened the life), corresponding dose detector quantity of fissioning also only has 4~6, therefore, passes through this side
Method cannot continuously obtain the neutron irradiation damage fluence of reactor pressure vessel steel；Simultaneously because irradiation monitoring pipe extract, transport,
The work such as cutting dissection, fission dose detector assay at least needed for 1 year, obtained reactor pressure by this method
There is also apparent hysteresis qualitys in time for the neutron irradiation damage fluence of container steel；
4) fission dose detector belongs to disposable products, and has stronger radioactivity after use, while analyzing
Chemical examination link also generates a large amount of radioactive wastes, and subsequent three-protection design amount is larger, higher cost；
5) above method is only capable of monitoring the neutron irradiation damage fluence in reactor pressure vessel reactor core area on the whole, does not have
The irradiation damage fluence of standby monitoring other components of reactor pressure vessel, especially specific position.
In view of this, can real-time, online, follow-on test monitoring nuclear power plant reactor pressure appearance it is necessory to provide one kind
The method of device neutron irradiation damage fluence.
Summary of the invention
Goal of the invention of the invention is: overcoming the deficiencies of the prior art and provide one kind can real-time, online, follow-on test
Monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence method.
Lot of experiments discovery, reactor pressure vessel steel be on active service when radiation embrittlement during, magnetism of material
The changing rule of energy parameter and its neutron irradiation damage fluence have preferable relevance, pass through and monitor reactor pressure vessel steel magnetic
The variation of performance parameter can get its neutron irradiation damage fluence.
In order to achieve the above-mentioned object of the invention, the present invention provides a kind of monitoring nuclear power plant reactor pressure vessel neutron irradiation damage
Hurt the method for fluence comprising following steps:
The magnetic property ginseng at a certain monitoring position of the reactor pressure vessel steel of S1, real-time monitoring nuclear power station during normal operation
Number, the magnetic parameter are magnetic susceptibility χ, remanent magnetization MRWith coercivity HCIn any one；
S2, the neutron irradiation damage fluence Φ that reactor pressure vessel is calculated based on the magnetic parameter measured in real time.
A kind of improvement of method as present invention monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence, institute
Neutron irradiation damage fluence Φ is stated as analysis input parameter, for its structure during reactor pressure vessel irradiation damage
Integrality carries out security evaluation or life prediction.
A kind of improvement of method as present invention monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence, institute
When to state magnetic parameter be magnetic susceptibility χ, neutron irradiation damage fluence Φ is calculated based on the magnetic susceptibility χ that measures in real time, shows as public affairs
Formula (1):
Φ=c1·㏑(b1-a1·χ) (1)
Wherein, a1Value range be 0.75-1.38；b1Value range be 8.78-16.75；c1Value range be
0.042-0.17；The unit of Φ is dpa.
A kind of improvement of method as present invention monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence, institute
State a1、b1And c1The influence factor of value includes the Microstructure characteristics and nuclear power station fortune of reactor pressure vessel steel original state
Pile neutron irradiation field power spectrum between the departure date.
A kind of improvement of method as present invention monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence, institute
Stating magnetic parameter is remanent magnetization MRWhen, based on the remanent magnetization M measured in real timeRCalculate neutron irradiation damage note
Φ is measured, formula (2) are shown as:
Φ=b2-a2·MR (2)
Wherein, a2Value range be 0.087-0.23；b2Value range be 0.12-0.31；The unit of Φ is dpa.
A kind of improvement of method as present invention monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence, institute
State a2And b2The influence factor of value includes Microstructure characteristics and the nuclear power station runtime of reactor pressure vessel steel original state
Between pile neutron irradiation field power spectrum.
A kind of improvement of method as present invention monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence, institute
Stating magnetic parameter is coercivity HCWhen, based on the coercivity H measured in real timeCNeutron irradiation damage fluence Φ is calculated, public affairs are shown as
Formula (3):
Φ=D-a3·HC+b3·(HC)2-c3·(HC)3 (3)
Wherein, a3Value range be 1.79-3.21；b3Value range be 0.19-0.41；c3Value range be
The value range of 0.007-0.19, D are 5.64-9.23；The unit of Φ is dpa.
A kind of improvement of method as present invention monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence, institute
State D, a3、b3And c3The influence factor of value includes the Microstructure characteristics and nuclear power station of reactor pressure vessel steel original state
Pile neutron irradiation field power spectrum during operation.
Compared with the existing technology, the present invention monitors the method tool of nuclear power plant reactor pressure vessel neutron irradiation damage fluence
There are following advantageous effects:
1) can in real time, online, reactor pressure vessel steel during the operation of follow-on test nuclear power station magnetic parameter, and it is real
When calculate obtain reactor pressure vessel steel neutron spoke damage fluence data；
2) the neutron irradiation damage fluence of the multiple positions of reactor pressure vessel can be monitored simultaneously；
3) due to the magnetism testing of reactor pressure vessel steel be it is lossless, prolong in nuclear power station full phase in longevity, including future
Longevity can test acquisition data during running infinitely；
4) test equipment and operation do not need special radiological safety protection requirement, and to equipment free surrounding space substantially without wanting
It asks, it is low in cost, safety is preferable, radioactive waste, basic no three wastes process demand are not generated especially.
Detailed description of the invention
With reference to the accompanying drawings and detailed description, to present invention monitoring nuclear power plant reactor pressure vessel neutron irradiation damage
The method for hurting fluence is described in detail, in which:
Fig. 1 is the method and step flow chart of present invention monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence.
Functional relation of the Fig. 2 between reactor pressure vessel steel reactor core section position magnetic susceptibility and neutron irradiation damage fluence
Figure.
Letter of the Fig. 3 between reactor pressure vessel steel reactor core section position remanent magnetization and neutron irradiation damage fluence
Number relational graph.
Functional relation of the Fig. 4 between reactor pressure vessel steel reactor core section position coercivity and neutron irradiation damage fluence
Figure.
Specific embodiment
In order to be more clear goal of the invention of the invention, technical solution and its technical effect, below in conjunction with attached drawing and tool
Body embodiment, the present invention will be described in further detail.It should be understood that specific embodiment party described in this specification
Formula is not intended to limit the present invention just for the sake of explaining the present invention.
It please refers to shown in Fig. 1, the present invention provides a kind of monitoring nuclear power plant reactor pressure vessel neutron irradiation damage notes
The method of amount comprising following steps:
The magnetic property ginseng at a certain monitoring position of the reactor pressure vessel steel of S1, real-time monitoring nuclear power station during normal operation
Number, magnetic parameter are magnetic susceptibility χ, remanent magnetization MRWith coercivity HCIn any one；
S2, the neutron irradiation damage fluence Φ that reactor pressure vessel is calculated based on the magnetic parameter measured in real time.
Reactor pressure vessel steel is when being on active service during radiation embrittlement, magnetic susceptibility χ, residue in magnetism of material energy parameter
Magnetization MRWith coercivity HCAll there is preferable relevance with its neutron irradiation damage fluence respectively, it therefore, can be by monitoring magnetic
Rate χ, remanent magnetization MRWith coercivity HCIn any one parameter obtain its neutron irradiation damage fluence Φ.
Letter when the magnetic parameter of real-time monitoring is magnetic susceptibility χ, between magnetic susceptibility χ and neutron irradiation damage fluence Φ
Number relationship is formula (1),
Φ=c1·㏑(b1-a1·χ) (1)
Wherein, a1Value range be 0.75-1.38；b1Value range be 8.78-16.75；c1Value range be
0.042-0.17；The unit of Φ is dpa.a1、b1And c1Value will receive reactor pressure vessel original state grain size,
The influence of pile neutron irradiation field power spectrum during Types of Dislocations, quantity, the second phase characteristic distributions and nuclear power station are run.For
Specific nuclear power station and reactor pressure vessel, can also be determined by traditional irradiation fission detector test data
Or amendment.
According to the magnetic susceptibility χ numerical value measured in real time, neutron irradiation damage fluence Φ can be calculated, and neutron irradiation damage
Fluence Φ is as analysis input parameter, for carrying out safety to its structural intergrity during reactor pressure vessel irradiation damage
Assessment or life prediction.
Magnetic parameter is alternatively chosn to remanent magnetization MR, remanent magnetization MRWith neutron irradiation damage fluence Φ
Functional relation be formula (2):
Φ=b2-a2·MR (2)
Wherein, a2Value range be 0.087-0.23；b2Value range be 0.12-0.31；The unit of Φ is dpa.Together
Sample, a2And b2Value also will receive the grain size of reactor pressure vessel original state, Types of Dislocations, quantity, the second phase point
The influence of pile neutron irradiation field power spectrum during cloth feature and nuclear power station are run.For specific nuclear power station with react stacking pressure
Force container can also be determined or be corrected by traditional irradiation fission detector test data.
When magnetic parameter is selected as coercivity HCWhen, coercivity HCFunctional relation with neutron irradiation damage fluence Φ is
Formula (3):
Φ=D-a3·HC+b3·(HC)2-c3·(HC)3 (3)
Wherein, a3Value range be 1.79-3.21；b3Value range be 0.19-0.41；c3Value range be
The value range of 0.007-0.19, D are 5.64-9.23；The unit of Φ is dpa.
Likewise, D, a3、b3And c3Value also will receive the grain size of reactor pressure vessel original state, dislocation class
The influence of pile neutron irradiation field power spectrum during type, quantity, the second phase characteristic distributions and nuclear power station are run.For specific
Nuclear power station and reactor pressure vessel can also be determined or be repaired by traditional irradiation fission detector test data
Just.
Parameter is inputted using the neutron irradiation damage fluence Φ of above-mentioned acquisition as analysis, for carrying out reactor pressure vessel
The structural intergrity safety evaluation of irradiation damage, life prediction etc..Specific method is identical as traditional irradiation analysis method.
Embodiment 1
By taking the magnetic parameter at particular point in time real-time monitoring reactor pressure vessel steel reactor core section position as an example.
When particular point in time monitoring magnetic parameter be magnetic susceptibility χ=3.290, neutron can be calculated according to formula (1)
Irradiation damage fluence Φ.
During the Microstructure characteristics and nuclear power station for considering reactor pressure vessel steel original state are run in reactor
After the influence factor of sub- irradiation field power spectrum, a in formula (1) is obtained1、b1And c1Value be respectively 1.07,13.15 and 0.07, then
The calculating process of neutron irradiation damage fluence Φ is as follows:
Φ=0.07ln (13.15-1.07 χ)=0.07ln (13.15-1.07 × 3.290)=0.15860dpa
When magnetic parameter is remanent magnetization MR, remanent magnetization M that same time point measuresR=0.24emu/
G can calculate neutron irradiation damage fluence Φ according to formula (2).
After considering various influence factors, in formula (2), a2And b2Value be respectively 0.14 and 0.19, then neutron irradiation damages
The calculating process for hurting fluence Φ is as follows:
Φ=0.19-0.14MR=0.19-0.14 × 0.24=0.15640dpa
When magnetic parameter is coercivity HC, coercivity H that same time point measuresC=7.1Oe can be counted according to formula (3)
Calculate neutron irradiation damage fluence Φ.
After considering various influence factors, in formula (3), D, a3、b3And c3Value be respectively 7.65,2.56,0.29 and
0.01, then the calculating process of neutron irradiation damage fluence Φ is as follows:
Φ=7.65-2.56HC+0.29(HC)2-0.01(HC)3=0.15304dpa
Magnetic susceptibility χ, remanent magnetization M in the present embodimentRWith coercivity HCRespectively with the letter of neutron irradiation damage fluence Φ
Number relational graph is as shown in Figure 2, Figure 3 and Figure 4.
Parameter is inputted using calculated neutron irradiation damage fluence Φ as analysis, to reactor pressure vessel irradiation damage
Structural intergrity in the process carries out security evaluation or life prediction；Detailed process and traditional irradiation analysis method phase
Together.
Comparative example 1
For the validity of the method for verifying present invention monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence, take
Traditional reactor pressure vessel with identical irradiation damage degree (referring generally to neutron irradiation accumulation fluence having the same)
Irradiation control sample carries out destructive mechanical property test, surveys and obtain the neutron irradiation damage fluence Φ at reactor core section position.
The numerical value for the neutron irradiation damage fluence Φ that the different magnetic parameters of 1 embodiment of table 1 and comparative example 1 obtain
It can be seen from Table 1 that different magnetic parameter (magnetic susceptibility χ, remanent magnetization M are respectively adopted in embodiment 1R
With coercivity HC) numerical value of the neutron irradiation damage fluence Φ at reactor core section position that is calculated and 1 measured value of comparative example are very
It is close；Deviation within the acceptable range, will not bring the safety evaluation of subsequent reactions core pressure vessel irradiation damage
It influences.
Therefore, the method that present invention monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence can be used replaces passing
The irradiation analysis method of system, not only method is simple, and data are accurate, and can realize that real-time online is assessed, simultaneous reactions heap
Magnetic susceptibility, remanent magnetization and the coercivity test of pressure vessel steel are lossless, therefore in the nuclear power station full phase in longevity and not
Acquisition data can be tested infinitely during operation of lengthening the life.
It can be seen that compared with the existing technology in conjunction with the above detailed description of the present invention, the present invention at least has following
Advantageous effects:
1) can in real time, online, reactor pressure vessel steel during the operation of follow-on test nuclear power station magnetic parameter, and it is real
When calculate obtain reactor pressure vessel steel neutron spoke damage fluence data；
2) the neutron irradiation damage fluence of the multiple positions of reactor pressure vessel can be monitored simultaneously；
3) due to the magnetism testing of reactor pressure vessel steel be it is lossless, in the nuclear power station full phase in longevity, including not
Acquisition data can be tested infinitely during operation of lengthening the life；
4) test equipment and operation do not need special radiological safety protection requirement, and to equipment free surrounding space substantially without wanting
It asks, it is low in cost, safety is preferable, radioactive waste, basic no three wastes process demand are not generated especially.
According to above-mentioned principle, the present invention can also be made appropriate changes and modifications to the above embodiments.Therefore, this hair
It is bright to be not limited to specific embodiment disclosed and described above, some modifications and changes of the invention should also be as to fall into this
In the scope of protection of the claims of invention.In addition, although being used some specific terms in this specification, these terms
Merely for convenience of description, it does not limit the present invention in any way.
Claims (5)
1. a kind of method for monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence, which is characterized in that including following
Step:
The magnetic parameter at a certain monitoring position of the reactor pressure vessel steel of S1, real-time monitoring nuclear power station during normal operation,
The magnetic parameter is magnetic susceptibility χ, remanent magnetization MRWith coercivity HCIn any one；
S2, the neutron irradiation damage fluence Φ that reactor pressure vessel is calculated based on the magnetic parameter measured in real time:
When the magnetic parameter is magnetic susceptibility χ, neutron irradiation damage fluence Φ, table are calculated based on the magnetic susceptibility χ measured in real time
Now it is formula (1):
Φ=c1·㏑(b1-a1·χ) (1)
Wherein, a1Value range be 0.75-1.38, b1Value range be 8.78-16.75, c1Value range be 0.042-
0.17, Φ unit is dpa；
The magnetic parameter is remanent magnetization MRWhen, based on the remanent magnetization M measured in real timeRCalculate neutron irradiation
Fluence Φ is damaged, formula (2) are shown as:
Φ=b2-a2·MR (2)
Wherein, a2Value range be 0.087-0.23, b2Value range be 0.12-0.31, the unit of Φ is dpa；
The magnetic parameter is coercivity HCWhen, based on the coercivity H measured in real timeCCalculate neutron irradiation damage fluence Φ, table
Now it is formula (3):
Φ=D-a3·HC+b3·(HC)2-c3·(HC)3 (3)
Wherein, a3Value range be 1.79-3.21, b3Value range be 0.19-0.41, c3Value range be 0.007-
0.19, D value range is 5.64-9.23, and the unit of Φ is dpa.
2. the method for monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence according to claim 1, special
Sign is that the neutron irradiation damage fluence Φ is as analysis input parameter, for reactor pressure vessel irradiation damage mistake
Cheng Zhongqi structural intergrity carries out security evaluation or life prediction.
3. the method for monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence according to claim 1, special
Sign is, a1、b1And c1The influence factor of value include reactor pressure vessel steel original state Microstructure characteristics and
Pile neutron irradiation field power spectrum during nuclear power station is run.
4. the method for monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence according to claim 1, special
Sign is, a2And b2The influence factor of value includes the Microstructure characteristics and core of reactor pressure vessel steel original state
Pile neutron irradiation field power spectrum during power station is run.
5. the method for monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence according to claim 1, special
Sign is, described D, a3、b3And c3The influence factor of value includes the Microstructure characteristics of reactor pressure vessel steel original state
With pile neutron irradiation field power spectrum during nuclear power station operation.
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| CN201710594049.8A CN107358983B (en) | 2017-07-20 | 2017-07-20 | The method for monitoring nuclear power plant reactor pressure vessel neutron irradiation damage fluence |
| GB1917961.3A GB2577425B8 (en) | 2017-05-09 | 2017-12-15 | Non-destructive assessment method for radiation damage of reactor pressure vessel in nuclear power plant |
| PCT/CN2017/116357 WO2018205607A1 (en) | 2017-05-09 | 2017-12-15 | Non-destructive assessment method for radiation damage of reactor pressure vessel in nuclear power plant |
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| GB2577425B8 (en) * | 2017-05-09 | 2022-09-07 | China Nuclear Power Eng Co Ltd | Non-destructive assessment method for radiation damage of reactor pressure vessel in nuclear power plant |
| CN109817357B (en) * | 2019-01-28 | 2020-07-31 | 中广核工程有限公司 | Method and device for evaluating radiation damage of reactor pressure vessel based on magnetization work |
| CN109817356B (en) * | 2019-01-28 | 2020-08-04 | 中广核工程有限公司 | Method and device for monitoring RPV neutron irradiation damage based on magnetization work parameters |
| CN110990999B (en) * | 2019-10-31 | 2023-05-23 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Neutron tube life test method, neutron tube life test device, computer equipment and storage medium |
| CN111816334A (en) * | 2020-07-20 | 2020-10-23 | 中国核动力研究设计院 | Irradiation monitoring tube |
| CN114323945B (en) * | 2021-12-29 | 2023-09-12 | 宁波市特种设备检验研究院 | Pressure container safety rapid judging method based on coercive force |
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| CN106128528A (en) * | 2016-07-28 | 2016-11-16 | 中广核工程有限公司 | A kind of method and apparatus monitoring nuclear power plant reactor pressure vessel irradiation damage |
| CN106710648A (en) * | 2016-12-16 | 2017-05-24 | 深圳中广核工程设计有限公司 | Nuclear power plant reactor pressure vessel irradiation damage monitoring method |
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| CN106128528A (en) * | 2016-07-28 | 2016-11-16 | 中广核工程有限公司 | A kind of method and apparatus monitoring nuclear power plant reactor pressure vessel irradiation damage |
| CN106710648A (en) * | 2016-12-16 | 2017-05-24 | 深圳中广核工程设计有限公司 | Nuclear power plant reactor pressure vessel irradiation damage monitoring method |
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