CN105070333B - Thimble tube fuel element failure determination methods - Google Patents
Thimble tube fuel element failure determination methods Download PDFInfo
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- CN105070333B CN105070333B CN201510449025.4A CN201510449025A CN105070333B CN 105070333 B CN105070333 B CN 105070333B CN 201510449025 A CN201510449025 A CN 201510449025A CN 105070333 B CN105070333 B CN 105070333B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The present invention discloses thimble tube fuel element failure determination methods, comprises the following steps：Step 1, selection critical nuclide, make the activity concentration of critical nuclide and the relation trendgram of reactor capability, step 2, the benchmark nucleic chosen in cladding materials, the relation trendgram of K values and reactor capability is made, wherein K values are equal to the activity concentration of the activity concentration divided by benchmark nucleic of critical nuclide；The controlling value of step 3, the warning value of setting critical nuclide and critical nuclide；The stove section that the activity concentration of critical nuclide exceedes the warning value of critical nuclide is interval interval for failure time, is considered as element rupture or involucrum corrosion in failure time interval；Step 4, made according to failure time interval K values warning value and K values controlling value curve；Step 5, when K values are more than the controlling value of K values, it is interval A that the failure time is interval, is considered as element rupture；When warning value of the K values less than K values, it is interval B that the failure time is interval, is considered as element normal.
Description
Technical field
The present invention relates to fuel element failure judgment technology, and in particular to arrived thimble tube fuel element failure judgement side
Method.
Background technology
After low denseization of HFETR fuel elements, water activity and typical nuclide concentration（Such as24Na、131I、137Cs）Than highly concentrated
The reason for element period height, rising is element rupture or involucrum corrosion.Existing nucleic analyzes handss with power relation Trend judgement
During Duan Buneng is accurately judged to involucrum, whether the thimble tube fuel element element containing nuclear fuel is damaged, in order to effectively screen element
The difference of damaged and involucrum corrosion, correctly judges the whether true breakage of fuel element, it would be desirable to it is a set of can be accurately and reliably anti-
The state of research reactor thimble tube fuel element should be gone out（Such as involucrum extent of corrosion, whether element intact etc.）Method.
The content of the invention
It is an object of the invention to provide a kind of thimble tube fuel element failure determination methods, accurately and reliably reflect set
The state of cast fuel element, the interval that the interval and involucrum corrosion that its element rupture generation is found out in stove section occurs.
To reach above-mentioned purpose, technical scheme is as follows：
Thimble tube fuel element failure determination methods, comprise the following steps：
Step 1, the critical nuclide chosen, make the activity concentration of critical nuclide and the relation trendgram of reactor capability,
The activity concentration of critical nuclide is vertical coordinate, and reactor capability is vertical coordinate, and stove section is abscissa；
Step 2, the benchmark nucleic chosen in cladding materials, make the relation trendgram of K values and reactor capability, and K values are
Vertical coordinate, reactor capability are vertical coordinate, and stove section is abscissa, and wherein K values are equal to the activity concentration of critical nuclide divided by benchmark
The activity concentration of nucleic；
Step 3, in the relation trendgram of step 1 arrange critical nuclide warning value and critical nuclide controlling value；Close
The activity concentration of key nucleic exceedes the stove section interval of the warning value of critical nuclide and is considered as element rupture or involucrum corrosion；Critical nuclide
Activity concentration less than the stove section interval of the warning value of critical nuclide, to be considered as element normal.
Step 4, warning value and K that K values are made according to the interval ruuning situation of the failure time of the relation trendgram of step 1
The curve of the controlling value of value；
Step 5, the curve of the controlling value of the warning value and K values of K values is arranged in the relation trendgram of step 2, works as step
When element rupture or involucrum corrosion are determined that it is in rapid 3, when K values are more than the controlling value of K values, the interval is interval A, in interval
It is considered as element rupture in A；If K values are less than the controlling value of K values, it is interval B that the failure time is interval, in interval B
It is considered as involucrum corrosion.
The present invention design principle be：As, after generating device breakage or involucrum corrosion condition, its critical nuclide can go out
The situation for now rolling up, its activity concentration are higher than highly concentrated element period therefore dense by the activity of the critical nuclide in step 1
The relation trendgram of degree and reactor capability, it can be seen that the steep increasing situation of critical nuclide, for example, element is sent out in whole stove section
Raw primary element is damaged and an involucrum corrodes, then we can be appreciated that the activity concentration of critical nuclide occurs 2 times and increase suddenly feelings
Shape, either generating device is damaged or involucrum corrosion occurs, and can all cause the steep increasing situation of critical nuclide, become in above-mentioned relation
In gesture figure, then peak value occurs, therefore, after step 3, we just can according to its it is steep increase situation judge element rupture or
Involucrum corrodes.When to the operation later stage, the activity concentration of critical nuclide is close to the controlling value of critical nuclide, if element rupture
The serious or only generation involucrum corrosion for occurring, therefore, the activity concentration of critical nuclide will not occur significant increase, can
Only to increase to below the controlling value of critical nuclide, the stove section that the activity concentration of key nucleic exceedes the warning value of critical nuclide is interval
It is considered as element rupture or involucrum corrosion；If under such case occurs, cannot correctly judge it is element rupture or fuel element
Workmanship cause involucrum corrosion.Therefore, we distinguish activity concentration in critical nuclide in crucial core by K values
During situation below the controlling value of element, it is as element rupture causes or as the involucrum concentration that causes of corrosion increases on earth.
Therefore, after step 4 and step 5, can find out from the relation trendgram of step 2, the warning value and the control of K values of K values and K values
The relation of value processed, if it is involucrum corrodes the situation for occurring, then the concentration of the benchmark nucleic in cladding materials can roll up, because
This K value will diminish, if when the situation that occurs of element rupture, therefore the concentration of benchmark nucleic will not increase or increase on a small quantity,
Therefore just greatly, in the case of this K values, it is due to element that we just clearly can determine bottom from the size of K values to K values
Breakage causes or as the concentration that involucrum corrosion causes increases.Meanwhile, the present invention is additionally provided with the warning value and K values of K values
Controlling value, therefore, when K values are more than the controlling value of K values, then explanation is as the K value changes that element rupture causes increase（Significantly）；
When K values are more than the controlling value of K values, the interval is interval A, in interval A is considered as element rupture；If K values are less than the control of K values
During value processed, it is interval B that the failure time is interval, is considered as involucrum corrosion in interval B.
Preferably, the critical nuclide is131I.The benchmark nucleic is24Na。
Preferably, the K values=131I /24Na.The controlling value of the K values is 0.02.The warning value of K values is 0.01.
Preferably, the controlling value of the critical nuclide is 80KBq/L.The warning value of the critical nuclide is 60KBq/L.
Preferably, in failure time is interval, when the activity concentration of critical nuclide exceedes the controlling value of critical nuclide, depending on
It is that element rupture or involucrum corrode；When the activity concentration of critical nuclide is less than the warning value of critical nuclide, it is considered as element normal.
Effect of the invention is that：The present invention is sorted out and a set of accurately and reliably reflects research reactor by reasonable analysis
The state of thimble tube fuel element（Such as involucrum extent of corrosion, whether element intact etc.）Method.And two kinds in this research
Method is simple to operate, and operations staff is easy to grasp, and is conducive to operations staff to track understanding reactor fuel element operation conditions in time,
Facilitate operations staff to make correct analysis in operation to research reactor thimble tube fuel element and judge, screen and manufacture because of element
Whether a water activity concentration and water typical case's nucleic activity exception that problem causes, accurately judge research reactor thimble tube element
It is damaged.
Description of the drawings
Relation trendgrams of the Fig. 1 for the activity concentration and reactor capability of critical nuclide.
Fig. 2 is the relation trendgram of K values and reactor capability.
Specific embodiment
With reference to embodiment and its accompanying drawing, the present invention is described in further detail, but embodiments of the present invention
Not limited to this.
Embodiment 1
As depicted in figs. 1 and 2.
Thimble tube fuel element failure determination methods, comprise the following steps：
Step 1, selection critical nuclide, make the activity concentration of critical nuclide and the relation trendgram of reactor capability, close
The activity concentration of key nucleic is vertical coordinate, and reactor capability is vertical coordinate, and stove section is abscissa；
Step 2, the benchmark nucleic chosen in cladding materials, make the relation trendgram of K values and reactor capability, and K values are
Vertical coordinate, reactor capability are vertical coordinate, and stove section is abscissa, and wherein K values are equal to the activity concentration of critical nuclide divided by benchmark
The activity concentration of nucleic；
Step 3, in the relation trendgram of step 1 arrange critical nuclide warning value and critical nuclide controlling value；Close
The stove section interval that the activity concentration of key nucleic exceedes the warning value of critical nuclide is interval for failure time, in failure time is interval
It is considered as element rupture or involucrum corrosion；
Step 4, according to the interval ruuning situation of the failure time of the relation trendgram of step 1, it is interval according to failure time
Make the curve of the controlling value of the warning value and K values of K values；
Step 5, the curve of the controlling value of the warning value and K values of K values is arranged in the relation trendgram of step 2, broken
Damage in time interval, when K values are more than the controlling value of K values, it is interval A that the failure time is interval, be considered as element in interval A and break
Damage；When K values are more than the controlling value of K values, the interval is interval A, in interval A is considered as element rupture；If K values are less than K values
Controlling value when, it is interval B that the failure time is interval, is considered as involucrum corrosion in interval B.
The present invention design principle be：As, after generating device breakage or involucrum corrosion condition, its critical nuclide can go out
The situation for now rolling up, its activity concentration are higher than highly concentrated element period therefore dense by the activity of the critical nuclide in step 1
The relation trendgram of degree and reactor capability, it can be seen that the steep increasing situation of critical nuclide, for example, element is sent out in whole stove section
Raw primary element is damaged and an involucrum corrodes, then we can be appreciated that the activity concentration of critical nuclide occurs 2 times and increase suddenly feelings
Shape, either generating device is damaged or involucrum corrosion occurs, and can all cause the steep increasing situation of critical nuclide, become in above-mentioned relation
In gesture figure, then peak value occurs, therefore, after step 3, we just can according to its it is steep increase situation judge element rupture or
Involucrum corrodes.When to the operation later stage, the activity concentration of critical nuclide is close to the controlling value of critical nuclide, if element rupture
The serious or only generation involucrum corrosion for occurring, therefore, the activity concentration of critical nuclide will not occur significant increase, can
Only to increase to below the controlling value of critical nuclide, if under such case occurs, correctly cannot judge be element rupture or
The involucrum corrosion that the workmanship of fuel element causes.Therefore, we are distinguished by K values at the activity concentration of critical nuclide
During situation below the controlling value of critical nuclide, be on earth due to element rupture causes or due to involucrum corrosion cause it is dense
Degree increases.Therefore, after step 4 and step 5, can find out from the relation trendgram of step 2, the warning value of K values and K values and
The relation of the controlling value of K values, if it is the situation that involucrum corrosion occurs, then the concentration of the benchmark nucleic in cladding materials can be a large amount of
Increase, therefore K values will diminish, if when the situation that occurs of element rupture, therefore the concentration of benchmark nucleic will not increase or lack
Amount increases, therefore K values are just greatly, and in the case of this K values, we just clearly can determine bottom from the size of K values is
As element rupture causes or as the concentration that involucrum corrosion causes increases.Meanwhile, the present invention is additionally provided with the warning value of K values
With the controlling value of K values, therefore, when K values are more than the controlling value of K values, then explanation is as the K value changes that element rupture causes increase
（Significantly）；When K values are more than the controlling value of K values, the interval is interval A, in interval A is considered as element rupture；If K values are less than K
During the controlling value of value, it is interval B that the failure time is interval, is considered as involucrum corrosion in interval B.
Preferably, the critical nuclide is131I.The benchmark nucleic is24Na.Preferably, the K values=131I /24Na。
The controlling value of the K values is 0.02.The warning value of K values is 0.01.Preferably, the controlling value of the critical nuclide is 80KBq/L.
The warning value of the critical nuclide is 60KBq/L.Preferably, in failure time is interval, the activity concentration of critical nuclide exceedes
The stove section of the warning value of critical nuclide is interval interval for failure time, is considered as element rupture or involucrum is rotten in failure time interval
Erosion；When the activity concentration of critical nuclide is less than the warning value of critical nuclide, it is considered as element normal.
In order to absolutely prove above-mentioned design principle, present invention spy is with Fig. 1 and Fig. 2 as practical application example explanation：
Such as Fig. 1, Fig. 1 is to choose131I is critical nuclide, a critical nuclide being prepared from according to step 1 and step 3 with
The relation trendgram of reactor capability, the relation trendgram we be referred to as chart 1,
Such as Fig. 2, Fig. 1 is to choose24Na takes K=as benchmark nucleic131I /24Na carries out trend analysiss, with K values and stove section
Make respectively as vertical coordinate, abscissa131I/24The relation trendgram of Na and reactor capability, the relation trendgram we referred to as
For chart 2.
From chart 1 as can be seen that there is the situation of 2 generation high concentrations in chart 1, for the first time131The activity concentration of I is most
Up to more than 180KBq/L, second131The activity concentration of I reaches 80KBq/L, after first time high concentration situation, its concentration
Below warning value is returned to, high concentration is increased again to afterwards, but secondary concentration is raised and only only risen to below controlling value,
May determine that fuel element may have occurred element rupture or involucrum corrosion, when to the operation later stage131The activity concentration of I connects
During nearly controlling value, thus figure cannot correctly judge whether that generating device is damaged.Cannot correctly judge it is element rupture or fuel
The involucrum corrosion that the workmanship of element causes.
Such as chart 2, by critical nuclide131The failure time that I is judged with reactor capability relation trendgram is interval, damaged
The stove section that time interval occurs high concentration activity is interval, makes131I /24The warning value and the curve of controlling value of Na, is shown in accompanying drawing
2.Found out by accompanying drawing 1 and the contrast of accompanying drawing 2：Fig. 1 show by131The activity concentration of I occurred to be similar to during representing whole service twice
The phenomenon of element rupture, for the first time131The activity concentration of I is up to more than 180KBq/L, for the second time131The activity concentration of I reaches
To 80KBq/L, reach131The warning value of the activity concentration of I.Accompanying drawing 2 shows131I/24During the ratio of Na represents whole service
It is first high point that fuel element occurs damaged event, considerably beyond warning value, while also beyond controlling value, and Fig. 1 institutes
Second breakage for showing display in fig. 2 is well below controlling value.Dissection to fuel element is also demonstrated that131The first time of I
Rising reason is element rupture, and it is the corrosion of the involucrum containing nuclear fuel that second raises reason（Cause containing nuclear fuel in involucrum
Critical nuclide activity concentration is raised）Cause.It follows that：By131I/24Na accurately can be sentenced with power relation trendgram
Break and fuel element failure, and can screen out what is caused because of element manufacturing issue131I activity concentrations are raised.
Above-described embodiment is only the preferred embodiments of the present invention, not limiting the scope of the invention, as long as adopting
The design principle of the present invention, and the change for carrying out non-creativeness work on this basis and making, all should belong to the present invention's
Within protection domain.
Claims (8)
1. thimble tube fuel element failure determination methods, comprise the following steps：
Step 1, selection critical nuclide, make the activity concentration of critical nuclide and the relation trendgram of reactor capability, crucial core
The activity concentration of element is vertical coordinate, and reactor capability is vertical coordinate, and stove section is abscissa；
Step 2, the benchmark nucleic chosen in cladding materials, make the relation trendgram of K values and reactor capability, and K values are vertical seat
Mark, reactor capability are vertical coordinate, and stove section is abscissa, and wherein K values are equal to the activity concentration of critical nuclide divided by benchmark nucleic
Activity concentration；
Step 3, in the relation trendgram of step 1 arrange critical nuclide warning value and critical nuclide controlling value；Crucial core
The activity concentration of element exceedes the stove section interval of the warning value of critical nuclide and is considered as element rupture or involucrum corrosion；The work of critical nuclide
It is normal that the stove section interval of the warning value that degree concentration is less than critical nuclide is considered as element；
Step 4, warning value and K values that K values are made according to the interval ruuning situation of the failure time of the relation trendgram of step 1
The curve of controlling value；
Step 5, the curve of the controlling value of the warning value and K values of K values is arranged in the relation trendgram of step 2, when step 3
In when determining that it is element rupture or involucrum and corroding, when K values are more than the controlling value of K values, the interval is interval A, is regarded in interval A
For element rupture；If K values are less than the controlling value of K values, it is interval B that the failure time is interval, is considered as bag in interval B
Shell corrodes.
2. thimble tube fuel element failure determination methods according to claim 1, it is characterised in that：The critical nuclide is
Typical fission nuclide, is elected as herein131I。
3. thimble tube fuel element failure determination methods according to claim 1, it is characterised in that：The benchmark nucleic is
Cladding benchmark nucleic, herein for24Na。
4. thimble tube fuel element failure determination methods according to claim 1, it is characterised in that：The K values=131I /24Na。
5. thimble tube fuel element failure determination methods according to claim 1, it is characterised in that：The control of the K values
It is worth for 0.02.
6. thimble tube fuel element failure determination methods according to claim 1, it is characterised in that：The warning value of K values is
0.01。
7. thimble tube fuel element failure determination methods according to claim 1, it is characterised in that：The critical nuclide
Controlling value is 80KBq/L.
8. thimble tube fuel element failure determination methods according to claim 1, it is characterised in that：The critical nuclide
Warning value is 60KBq/L.
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| CN107622804B (en) * | 2017-10-17 | 2019-08-13 | 中国核动力研究设计院 | A kind of setting method of fuel element rupture detection alarming value |
| CN108847295B (en) * | 2018-05-08 | 2021-09-17 | 中国核电工程有限公司 | Method for judging fuel cladding damage quantity of WWER unit |
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| US5537450A (en) * | 1994-01-31 | 1996-07-16 | Radiological & Chemical Technology, Inc. | On-line analysis of fuel integrity |
| JPH08313684A (en) * | 1995-05-16 | 1996-11-29 | Nippon Nuclear Fuel Dev Co Ltd | Reactor operation plan forming device |
| CN102169735A (en) * | 2010-12-23 | 2011-08-31 | 中国原子能科学研究院 | Nuclear power station fuel rod breakage on-line detection system |
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