CN115346700A - Reactor temperature history detection method and detection device - Google Patents
Reactor temperature history detection method and detection device Download PDFInfo
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Abstract
The invention discloses a historical reactor temperature detection method and a detection device, and relates to the technical field of reactor temperature detection; the detection method comprises the following steps: arranging a plurality of diffusion receiving media in a heat-conducting closed container, wherein the bottom of the closed container is filled with a diffusion solution; during the first opening operation, the closed container is placed in the reactor; forcing a plurality of diffusion receiving media into sequential contact with the diffusion solution at set time intervals while the reactor is in operation; taking out the closed container from the reactor during the next opening operation; and reversely deducing the temperature history of the closed container in the reactor according to the diffusion depth and the concentration of the tracer element in each diffusion receiving medium so as to accurately measure the temperature in the reactor. The detection device comprises a heat-conducting closed container, wherein the bottom of an inner cavity of the closed container is filled with diffusion solution, and a plurality of diffusion receiving media are arranged at intervals and used for realizing the detection method.
Description
Technical Field
The invention relates to the technical field of reactor temperature detection, in particular to a historical reactor temperature detection method and a detection device.
Background
In a fission reactor, measuring the temperature history within the stack has historically been a difficult problem. Due to the high temperature and strong radiation environment in the stack, general thermometric equipment cannot be used, and even thermocouples which are commonly used for measuring temperature in conventional experimental equipment have low reliability in such an environment, accurate measurement cannot be performed.
Therefore, it is necessary to provide a temperature measuring method and a detecting device which can adapt to high temperature and strong radiation environment, have high reliability, and have higher precision.
Disclosure of Invention
Aiming at the technical problem that the existing temperature measuring equipment cannot measure the temperature history in the reactor; the invention provides a reactor temperature history detection method and a detection device, which can resist a high-temperature strong radiation environment so as to accurately measure the temperature in a reactor, and have the characteristic of high reliability.
The invention is realized by the following technical scheme:
in a first aspect, the invention provides a method for detecting the temperature history of a reactor, which comprises the following steps:
arranging a plurality of diffusion receiving media in a heat-conducting closed container, wherein the bottom of the closed container is filled with a diffusion solution;
during the opening operation, the closed container is placed in the reactor;
forcing a plurality of said diffusion receiving media into sequential contact with said diffusion solution at set time intervals while the reactor is in operation;
taking out the closed container from the reactor during the next stack opening operation;
and reversely deducing the temperature history of the closed container in the reactor according to the diffusion depth and the concentration of the tracer elements in each diffusion receiving medium.
For a given diffusion solution and diffusion receiver medium, the diffusion depth of the tracer element in the diffusion receiver medium is related only to the temperature of the environment in which the diffusion solution is located, and is not affected by the intense radiation in the reactor. Therefore, the invention arranges a plurality of diffusion receiving media in the closed container which can conduct heat, the bottom of the inner cavity of the closed container is filled with diffusion solution, the closed container is placed in a reactor during the first stacking operation, the diffusion receiving media are forced to be in contact with the diffusion solution in sequence according to the set time interval during the operation of the reactor, and then the closed container is taken out from the reactor during the next stacking operation, thereby reversely deducing the temperature history of the closed container in the reactor according to the diffusion depth and concentration of the tracer element in the diffusion receiving media.
The measuring method provided by the invention reversely deduces the temperature history of the closed container in the reactor through the diffusion condition of the tracer element in the diffusion receiving medium, is not influenced by irradiation, can truly reflect the temperature in the reactor, and has the characteristic of high reliability.
Specifically, when the reactor is operated, the diffusion receiving mediums are driven to be sequentially immersed in and separated from the diffusion solution according to set time intervals, or the diffusion solution is driven to be sequentially submerged in the diffusion receiving mediums according to the set time intervals, so that the diffusion receiving mediums are sequentially forced to be contacted with the diffusion solution according to the set time intervals.
Specifically, the concentration and the depth distribution of the tracer element in each diffusion receiving medium are measured by a nuclear reaction analysis method, so that the concentration and the depth distribution of the tracer element in each diffusion receiving medium are obtained.
Specifically, the nuclear reaction analysis method is as follows: and taking the diffusion receiving medium as a target, and using a set incident particle for targeting, so that the incident particle and the tracer element generate nuclear reaction, and detecting an emergent nuclear reaction product on a set solid angle to reversely deduce the diffusion depth and concentration of the tracer element in the diffusion receiving medium.
In an optional embodiment, a numerical difference method is adopted to calculate the theoretical depth concentration distribution of the tracer elements in the diffusion receiving medium, and the theoretical depth concentration distribution is compared with the result measured by the nuclear reaction analysis method to reversely deduce the temperature in the reactor, and the measured value is compared with the theoretical calculated value, so that the temperature in the reactor can be obtained more accurately.
Specifically, the calculation model of the numerical difference method is:
in the formula: at is a set time interval, ax is a spatial step,
the concentration of the tracer element at the ith grid point in the nth step is shown.
In an optional embodiment, when the closed container is placed in a reactor, the fuse tube is placed in the reactor together, and the fuse has a fixed melting point, so that the upper and lower limits of the temperature in the reactor are obtained through the melting and resolidifying conditions of the fuse in the fuse tube, and a reference is provided for the later temperature solving process.
In a second aspect, the invention provides a reactor temperature history detection device, which comprises a heat-conducting closed container, wherein a diffusion solution is contained at the bottom of an inner cavity of the closed container, a plurality of diffusion receiving media are arranged at intervals in the inner cavity of the closed container, and the plurality of diffusion receiving media can be sequentially contacted with the diffusion solution.
The closed container is placed in a reactor during one-time stack opening operation, the diffusion receiving media are forced to sequentially contact with the diffusion solution according to a set time interval during the operation of the reactor, and then the closed container is taken out of the reactor during the next-time stack opening operation, so that the temperature history of the closed container in the reactor is reversely deduced according to the diffusion depth and the concentration of the tracer element in the diffusion receiving media.
In an alternative embodiment, a plurality of diffusion receiving mediums are arranged at intervals along the height direction of the closed container, and a radiation swelling material is arranged in the closed container to force the liquid level of the diffusion solution to rise through the swelling of the radiation swelling material, so that the diffusion solution is sequentially submerged in the diffusion receiving mediums according to a set time interval.
In an optional embodiment, an annular transmission rail is arranged in the closed container, the transmission rail is located above the diffusion solution, a plurality of diffusion receiving media are arranged at intervals along the length direction of the transmission rail, and the transmission rail is adapted with an intermittent mechanical driver, and the intermittent mechanical driver is used for driving the transmission rail to move according to a set time interval and a set step length.
Compared with the prior art, the invention has the following advantages and beneficial effects
1. The invention provides a reactor temperature history detection method, which is characterized in that a plurality of diffusion receiving media are arranged in a closed container capable of conducting heat, a diffusion solution is contained at the bottom of an inner cavity of the closed container, the closed container is placed in a reactor during a first stack opening operation, and the diffusion receiving media are forced to be sequentially contacted with the diffusion solution at set time intervals during the operation of the reactor, then the closed container is taken out of the reactor during the next stack opening operation, so that the temperature history of the closed container in the reactor is reversely deduced according to the diffusion depth and the concentration of a tracer element in the diffusion receiving media.
2. The invention provides a reactor temperature history detection device which comprises a heat-conducting closed container, wherein a diffusion solution is contained at the bottom of an inner cavity of the closed container, a plurality of diffusion receiving media are arranged at intervals and can be sequentially contacted with the diffusion solution, the closed container is placed in a reactor during a reactor opening operation, the diffusion receiving media are forced to be sequentially contacted with the diffusion solution according to a set time interval when the reactor operates, and then the closed container is taken out of the reactor during a next reactor opening operation, so that the temperature history of the closed container in the reactor is reversely deduced according to the diffusion depth and the concentration of a tracer element in the diffusion receiving media.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
In the drawings:
FIG. 1 is a schematic flow chart of a method for historical detection of reactor temperature according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a reactor temperature history detection apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another reactor temperature history detection apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the distribution of trace elements in a diffusion receiving medium according to an embodiment of the present invention.
Reference numbers and corresponding part names in the figures:
1-diffusion receiving medium, 2-closed container, 3-diffusion solution, 4-tracer element, 5-irradiation swelling material and 6-transmission track.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present application, the terms "central," "upper," "lower," "left," "right," "vertical," "longitudinal," "lateral," "horizontal," "inner," "outer," "front," "rear," "top," "bottom," and the like refer to orientations or positional relationships that are conventionally used in the manufacture of the present application, or that are routinely understood by those of ordinary skill in the art, but are merely used to facilitate the description and to simplify the description and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting of the present application.
Example 1
With reference to fig. 1, the present embodiment provides a method for detecting a reactor temperature history, including the following steps:
arranging a plurality of diffusion receiving media 1 in a closed container 2 capable of conducting heat, wherein the bottom of the closed container 2 is filled with a diffusion solution 3;
during a pile opening operation, the closed container 2 is placed in a reactor;
forcing a plurality of said diffusion receiving media 1 into contact with said diffusion solution 3 in sequence at set time intervals while the reactor is in operation;
taking the closed container 2 out of the reactor during the next pile-opening operation;
and reversely deducing the temperature history of the closed container 2 in the reactor according to the diffusion depth and the concentration of the tracer elements 4 in each diffusion receiving medium 1.
Wherein, when the reactor is running, the diffusion receiving mediums 1 are driven to be sequentially immersed in and separated from the diffusion solution 3 according to a set time interval, for example, the diffusion receiving mediums 1 are driven to be sequentially immersed in and separated from the diffusion solution 3 by a circulating track device. Or at set time intervals to force a plurality of diffusion receiving media 1 into sequential contact with the diffusion solution 3, if a variable volume device, such as a device made of a radiation swellable material, is disposed within the containment vessel 1.
With reference to fig. 4, after the closed container 2 is taken out from the reactor, the concentration and depth distribution of the tracer element 4 in each diffusion receiving medium 1 can be measured by using a nuclear reaction analysis method, so as to obtain the concentration and depth distribution of the tracer element 4 in each diffusion receiving medium 1.
Specifically, the nuclear reaction analysis method is as follows: the diffusion receiving medium 1 is used as a target, a set incident particle is used for targeting, the incident particle and the tracer element 4 are subjected to nuclear reaction, and an emergent nuclear reaction product is detected on a set solid angle so as to reversely deduce the diffusion depth and concentration of the tracer element 4 in the diffusion receiving medium 1.
Of course, the theoretical depth concentration distribution of the trace elements 4 in the diffusion receiving medium 1 may also be calculated by using a numerical difference method, so as to reversely deduce the temperature history. And the temperature in the reactor can be obtained more accurately by comparing the temperature in the reactor with the result measured by the nuclear reaction analysis method to reversely deduce the temperature in the reactor and comparing the measured value with a theoretical calculated value.
For the calculation model of the numerical difference method, in this embodiment, it is:
in the formula: at is a set time interval, ax is a spatial step,
the concentration of the tracer element at the ith grid point in the nth step is shown.
Further, when the closed container 2 is placed in a reactor, a fuse tube (fuse wire material is sealed in a glass tube) is placed in the reactor together, and due to the fact that the fuse wire has a fixed melting point, the upper limit and the lower limit of the temperature in the reactor are obtained through the melting and resolidifying conditions of the fuse wire in the fuse tube, and a parameter is provided for the later temperature solving process, so that the later temperature solving process is simplified.
It should be understood that when the diffusion receiving medium 1 is in the diffusion solution 2, the diffusion reaction continues to occur, and the equation of control can be given by Fick's second law
Wherein C is concentration and D is diffusion coefficient. The diffusion coefficient is related to the temperature and the relation is the Arrhenius formula
D＝Ae -(Q/RT)
Wherein T is temperature, R is ideal gas constant, and R = 8.314J/(mol · K). A and Q are constants related to the medium and can be obtained by a table look-up.
As can be seen from the above analysis, given a given temperature and time, the diffusion concentration depth distribution of the trace element is constant for a particular diffusion receiver medium, and therefore the temperature can be inferred by obtaining the concentration depth distribution of the trace element within the diffusion receiver medium by the measurement means of nuclear reaction analysis.
In addition, a numerical approach can be used to solve the governing equation, which is a one-dimensional diffusion equation that can be approximated as a semi-infinite diffusion since the thickness of the medium (several millimeters) is typically much greater than the depth (several microns) at which the trace elements can diffuse. When the diffusion receiving medium is in a diffusion solution, the solution conditions are
Initial value conditions:
boundary conditions are as follows:
the conditions for this determination were (1). In time, C 0 H is the concentration of the tracer element and h is the thickness of the medium.
In the actual solving process, a larger h value can be taken to approximate the situation of semi-infinite length. After the diffusion receiving medium exits from the diffusion solution, the solution conditions are
Initial value conditions:
C＝C i 0≤x≤h
boundary conditions are as follows:
C＝0 x＝h
the definite condition was expressed as (2). In the formula, C i Is the concentration of the tracer element that has diffused into the diffusion receiving medium upon exiting the diffusion solution.
Because the control equation is simple, the control equation can be discretized by using a difference method, and higher calculation speed and calculation precision can be obtained at the same time. In this patent, the difference format (Du Fute-Frankel format) is shown by Dufort-Frankel, which is expressed as follows:
wherein, Δ t is the time step, Δ x is the space step,
indicating the concentration of the tracer element at the ith grid point at step n. That is, the calculation model of the numerical difference method is:
it is assumed that the temperature at which a certain diffusion receiving medium undergoes a diffusion reaction under the definite conditions (1) and (2) is T 1 ，T 2 And after numerical calculation is carried out by using a calculation model formula of a numerical difference method, the concentration depth distribution of the tracer elements in the diffusion receiving medium can be obtained. And after the experiment is finished, sequentially measuring the real concentration depth distribution of the tracer elements in each diffusion receiving medium by adopting a nuclear reaction analysis method so as to compare the two, and continuously adjusting T 1 ，T 2 Until the depth concentration distribution obtained by numerical calculation is matched with the depth concentration distribution given by nuclear reaction analysis, and finally determining T 1 ，T 2 The value of (c). Due to the large number of diffusion receiving media, the times at which diffusion reactions occur for each diffusion receiving medium can be staggered in time to obtain the temperature for each time segment, i.e., the temperature history in the reactor.
In summary, in the present embodiment, a plurality of diffusion receiving mediums 1 are disposed in a closed container 2 capable of conducting heat, and a diffusion solution 3 is filled in the bottom of an inner cavity of the closed container 2, the closed container 2 is placed in a reactor during a first stacking operation, and when the reactor is operated, the plurality of diffusion receiving mediums 1 are sequentially forced to contact with the diffusion solution 3 according to a set time interval, and then the closed container 2 is taken out from the reactor during a next stacking operation, so as to reversely derive a temperature history experienced by the closed container 2 in the reactor according to a diffusion depth and a concentration of a trace element 4 in the diffusion receiving medium 1.
For a given tracer element 4 and diffusion receiver medium 1, the diffusion depth of the tracer element 4 in the diffusion receiver medium 1 is only related to the temperature of the environment in which the diffusion solution 3 is located, and is not affected by intense radiation in the reactor. Therefore, the measurement method provided by the embodiment reversely deduces the temperature history of the closed container 2 in the reactor through the diffusion condition of the tracer element 4 in the diffusion receiving medium 1, is not influenced by irradiation, can truly reflect the temperature in the reactor, and has the characteristic of high reliability.
Example 2
With reference to fig. 2, the present embodiment provides a reactor temperature history detection apparatus, which includes a heat-conductive sealed container 2, a diffusion solution 3 is contained at the bottom of an inner cavity of the sealed container 2, a plurality of diffusion receiving mediums 1 are arranged at intervals in the inner cavity of the sealed container 2, and the plurality of diffusion receiving mediums 1 can sequentially contact with the diffusion solution 3, so as to implement the method described in embodiment 1.
Wherein, when the reactor is running, the diffusion receiving mediums 1 are driven to be sequentially immersed in and separated from the diffusion solution 3 according to a set time interval, for example, the diffusion receiving mediums 1 are driven to be sequentially immersed in and separated from the diffusion solution 3 by a circulating track device. Or at set time intervals to force a plurality of diffusion receiving media 1 into sequential contact with the diffusion solution 3, if a variable volume device, such as a device made of a radiation swellable material, is disposed within the containment vessel 1.
When the closed container 2 is used, the closed container 2 is placed in a reactor during a reactor opening operation, when the reactor runs, the diffusion receiving media 1 are forced to be sequentially contacted with the diffusion solution 3 according to a set time interval, then the closed container 2 is taken out of the reactor during the next reactor opening operation, so that the temperature history of the closed container 2 in the reactor is reversely deduced according to the diffusion depth and the concentration of the tracer element 4 in the diffusion receiving media 1, and as the diffusion depth of the tracer element 4 in the diffusion receiving media 1 is only related to the temperature of the environment where the diffusion solution 3 is located and is not influenced by strong radiation in the reactor, the closed container can resist a high-temperature strong radiation environment, accurately measure the temperature in the reactor, and has the characteristic of high reliability.
Example 3
With reference to fig. 2, the present embodiment provides a reactor temperature history detection apparatus, based on the structure and principle described in embodiments 1 and 2, a plurality of diffusion receiving mediums 1 are arranged at intervals along the height direction of a closed container 2, and a radiation swelling material 5 is arranged in the closed container 2, so that the liquid level of the diffusion solution 3 is forced to rise by the swelling of the radiation swelling material 5, and thus the diffusion solution 3 is caused to sequentially submerge the diffusion receiving mediums 1 at set time intervals.
Specifically, in this embodiment, a certain amount of diffusion solution is contained in a sealed chamber and placed at the bottom of the chamber, and a fixed rail is provided in the middle of the chamber for carrying diffusion receiving media, the diffusion receiving media are arranged at equal intervals in height on the fixed rail, and initially, no diffusion receiving media are in contact with the diffusion solution, or the diffusion receiving media are directly mounted on the side wall of the closed container 1.
In the chamber there is a dose of radiation swelling material 5, which will increase in volume after exposure to radiation by an amount approximately linearly dependent on the dose, i.e. time. After the closed container is placed in a reactor, the irradiation swelling material 5 is influenced by radiation in the reactor, and the volume of the irradiation swelling material is gradually increased, so that the liquid level of the diffusion solution 3 is increased, and the irradiation swelling material is sequentially contacted with each diffusion receiving medium 1 on the fixed track, so that diffusion reaction is carried out, and temperature information is indirectly recorded. The temperature for this time period can be inferred by measuring the diffusion depth of the tracer element in each diffusion receiver medium after the experiment is completed. The temperature history in the reactor can then be obtained by integrating the temperatures at which the respective diffusion receiver media are exposed.
For the convenience of understanding, the reactor is opened at m-day intervals, and the size and shape of the radiation swelling material are adjusted so that n pieces of diffusion receiving media can be immersed while the liquid level of the diffusion solution is linearly raised. Adjusting the height of the diffusion receiving medium on the fixed track to be lowestThe diffusion receiving medium is almost in contact with the diffusion solution and thus it is believed that the diffusion reaction will have already begun after the containment vessel is placed in the reactor. The diffusion receiving medium was numbered from low to high as 1 to n, and it was found that the diffusion receiving medium No. 1 underwent a diffusion process for m days under the definite condition (1). No. 2 diffusion receiver media will experience a time under definite conditions (1) of
The diffusion process of the day. No. i diffusion receiving medium will experience a time under definite conditions (1) of
The diffusion process of the day. And the last diffusion receiving medium will experience a time of
The diffusion process of the day.
In addition, the process of solving the temperature can be carried out in a reverse-recursive manner, for simplicity, the time is divided into n sections, and the temperature in the reactor is assumed to be constant when the tracer element undergoes diffusion reaction in the diffusion receiving medium in each section of time. Assuming a proper temperature, calculating the concentration depth distribution of the trace element in the last diffusion receiving medium by using a calculation model of a numerical difference method, and comparing the concentration depth distribution with the concentration depth distribution obtained by nuclear reaction analysis until a reasonable temperature T is obtained n . At this time, it can be known that the temperature at which the n-1 th diffusion receiving medium undergoes the diffusion reaction in the nth period of time is T n Similarly, the temperature at which the diffusion is performed in the (n-1) th period is assumed, and the temperature T can be obtained by a similar method using a calculation model of a numerical difference method n-1 . Repeating the above steps to obtain T 1 To T n All temperatures, and thus the temperature history in the reactor, are obtained, and specific data are shown in table 1.
TABLE 1
In the table, the temperature of the bold font corresponds to the temperature found by the current diffusion receiving medium, and the remaining temperatures correspond to the temperatures found by the next diffusion receiving medium.
Example 4
With reference to fig. 3, this embodiment provides a reactor temperature history detection apparatus, based on the structures and principles described in embodiments 1 and 2, an annular transmission rail 6 is provided in the closed container 2, the transmission rail 6 is located above the diffusion solution 3, a plurality of diffusion receiving mediums 1 are arranged at intervals along the length direction of the transmission rail 6, the transmission rail 6 is adapted with an intermittent mechanical driver, and the intermittent mechanical driver is used to drive the transmission rail 6 to move according to a set time interval and a set step length.
Specifically, a certain amount of diffusion solution is filled in the closed container and is arranged at the bottom of the chamber, a transmission rail is fixed in the middle of the chamber and is used for carrying the diffusion receiving medium so as to control the arrangement interval of the diffusion receiving medium on the transmission rail, and no other diffusion receiving medium is contacted with the diffusion solution while the diffusion receiving medium at the bottom of the transmission rail is contacted with the diffusion solution.
The transmission track is driven by a mechanical driving mode, such as a clockwork spring or a spring, and can be in a jumping mode through a gear design mode and the like, namely the transmission track is in a static state in most of time, when the mechanical force drives the gear to move, the transmission track moves for a certain distance in a short time, and a diffusion receiving medium which is positioned on the track and is contacted with a diffusion solution is switched to enter the next long-time static state. Therefore, each time the transmission track is in a static time period, the tracer elements in the diffusion solution gradually diffuse into the current diffusion receiving medium, and the diffusion receiving medium with diffusion reaction is switched after the jump occurs.
The temperature for this time period can be inferred by measuring the diffusion depth of the tracer element in each diffusion receiver medium after the experiment is completed. The temperature history in the reactor can be obtained by integrating the temperatures at which the respective diffusion receiving media are located.
For the sake of understanding, assuming that the reactor opening time interval is m days, the mechanical driver and gear design of the transmission rail is adjusted so that the time interval of each jump of the transmission rail is
And n is the number of the diffusion receiving media. After the detection device is placed entirely within the reactor, the first diffusion receiver medium will experience a time under the definite conditions (1) of
The diffusion process of the day and the time under the definite conditions (2) is
The diffusion process of the day. The ith diffusion receiver medium will experience a time under the definite conditions (1) of
The diffusion process of the day and the time under the definite condition (2) is
The diffusion process of the day. While the last diffusion receiver medium will only experience a time of
The diffusion process of the day.
The process of solving for temperature may be in a back-stepping manner, and for simplicity, it is assumed that the temperature in the reactor is constant for each diffusion receiving medium undergoing a diffusion reaction in the diffusion solution. Calculation model solution using numerical difference method assuming a suitable temperatureObtaining the concentration depth distribution of the trace element in the last diffusion receiving medium, and comparing the concentration depth distribution with the concentration depth distribution obtained by nuclear reaction analysis until a reasonable temperature T is obtained n 。
At this time, it is known that the temperature at which the (n-1) th diffusion receiver medium is diffused under the definite condition (2) is T n Similarly, assuming the temperature at which diffusion is performed under the definite solution condition (1), the temperature T can be obtained by a similar method using a calculation model of a numerical difference method n-1 . So circulating, can obtain T 1 To T n All temperatures, and thus the temperature history in the reactor. As shown in table 2.
TABLE 2
In the table, the temperature of the bold font corresponds to the definite condition (1), and the remaining temperatures correspond to the definite condition (2).
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for detecting the temperature history of a reactor is characterized by comprising the following steps:
arranging a plurality of diffusion receiving media (1) in a closed container (2) capable of conducting heat, wherein the bottom of the closed container (2) is filled with a diffusion solution (3), and the diffusion solution (3) contains a tracer element (4);
during a pile-opening operation, the closed container (2) is placed in a reactor;
forcing a plurality of said diffusion receiving media (1) into contact with said diffusion solution (3) in sequence at set time intervals while the reactor is in operation;
taking out the closed container (2) from the reactor during the next opening operation;
and reversely deducing the temperature history of the closed container (2) in the reactor according to the diffusion depth and concentration of the tracer elements (4) in the diffusion solution (3) to the diffusion receiving medium (1).
2. The method for detecting the temperature history of the reactor according to claim 1, wherein when the reactor is operated, a plurality of diffusion receiving mediums (1) are driven to be sequentially immersed into and separated from the diffusion solution (3) according to a set time interval, or the diffusion solution (3) is driven to be sequentially immersed into the diffusion receiving mediums (1) according to a set time interval.
3. The method for historical detection of reactor temperature according to claim 1, characterized in that the concentration and depth distribution of the tracer elements (4) in each diffusion receiver medium (1) is measured using nuclear reaction analysis.
4. The method for historical detection of reactor temperature according to claim 3, wherein the nuclear reaction analysis method comprises: and taking the diffusion receiving medium (1) as a target, using a set incident particle for targeting, enabling the incident particle to perform nuclear reaction with the tracer elements (4), and detecting an emergent nuclear reaction product on a set solid angle so as to reversely deduce the diffusion depth and concentration of the tracer elements (4) in the diffusion receiving medium (1).
5. The method for historical detection of reactor temperature according to claim 3, wherein a numerical difference method is used to calculate the theoretical depth concentration distribution of the tracer elements (4) in the diffusion receiving medium (1) and compare the theoretical depth concentration distribution with the result measured by the nuclear reaction analysis method to reversely deduce the temperature in the reactor.
6. The method of claim 5, wherein the method comprisesIs characterized in that the calculation model of the numerical difference method is as follows:
in the formula: at is the set time interval, ax is the space step,
the concentration of the tracer element at the ith grid point in the nth step is shown.
7. The method for detecting the history of the reactor temperature according to claim 1, wherein when the closed vessel (2) is placed in the reactor, the fuse tube is placed in the reactor together.
8. The utility model provides a reactor temperature history detection device, its characterized in that, but including heat conduction's closed container (2), diffusion solution (3) are splendid attire to the inner chamber bottom of closed container (2), the inner chamber interval of closed container (2) is equipped with a plurality ofly diffusion receiving medium (1), a plurality of diffusion receiving medium (1) can in proper order with diffusion solution (3) contact.
9. The reactor temperature history detection apparatus according to claim 8, wherein a plurality of the diffusion receiving mediums (1) are arranged at intervals in a height direction of the closed vessel (2), and a radiation swelling material (5) is provided in the closed vessel (2) to force a liquid level of the diffusion solution (3) to rise by swelling of the radiation swelling material (5).
10. The reactor temperature history detection device according to claim 8, wherein an annular transmission rail (6) is arranged in the closed container (2), the transmission rail (6) is positioned above the diffusion solution (3), a plurality of diffusion receiving media (1) are arranged at intervals along the length direction of the transmission rail (6), and the transmission rail (6) is adapted with an intermittent mechanical driver which is used for driving the transmission rail (6) to move according to a set time interval and a set step length.
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| FR1219876A (en) * | 1958-04-11 | 1960-05-20 | Cold Und Silber Scheideanstalt | fuel element for nuclear reactors and process for its preparation |
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| FR3015665A1 (en) * | 2013-12-20 | 2015-06-26 | Commissariat Energie Atomique | EXTRACTIBLE DEVICE FOR MEASURING FLOW RATE AND INTAKE TEMPERATURE OF COOLING FLUID OF A NUCLEAR REACTOR |
| CN110058048A (en) * | 2019-05-20 | 2019-07-26 | 哈尔滨工程大学 | Narrow rectangular channel congestion condition Fluid field-thermal field synchronized measurement system |
| US20210358648A1 (en) * | 2018-11-01 | 2021-11-18 | Joint-Stock Company "Atomenergoproekt" | Cooling Method For Reactor Molten Core Melt And Cooling Control System For Reactor Molten Core |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR1219876A (en) * | 1958-04-11 | 1960-05-20 | Cold Und Silber Scheideanstalt | fuel element for nuclear reactors and process for its preparation |
| BE619565A (en) * | 1961-06-30 | 1962-12-31 | Euratom | Method and device for measuring temperature in a nuclear reactor |
| GB982095A (en) * | 1961-12-01 | 1965-02-03 | Atomic Energy Authority Uk | Improvements in or relating to containers for nuclear fuel |
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