CN116153537A - Passive detection age correction method for enrichment degree of fuel rod inner core block - Google Patents

Passive detection age correction method for enrichment degree of fuel rod inner core block Download PDF

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CN116153537A
CN116153537A CN202310227805.9A CN202310227805A CN116153537A CN 116153537 A CN116153537 A CN 116153537A CN 202310227805 A CN202310227805 A CN 202310227805A CN 116153537 A CN116153537 A CN 116153537A
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enrichment
age correction
standard fuel
fuel rod
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王长虹
刘明
张雷
汪陆
马金波
黄少川
李铁成
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China Nuclear Power Engineering Co Ltd
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Abstract

The application provides a passive detection age correction method for enrichment degree of fuel rod core blocks, which comprises the following steps of S1, obtaining enrichment degree parameters E of multi-section standard fuel core blocks sn S2, testing energy spectrums of the multi-section standard fuel pellets to obtain a characteristic gamma-ray count value C sn Step S3, selecting any two standard fuel pellets, and E based on the any two standard fuel pellets s1 ，C s1 ，E s2 ，C s2 Obtain the age correction coefficient Y n Step S4, based on age correction coefficient Y n Obtaining multi-section standard fuel pellets 235 U characteristic gamma ray actual count value C psn And W is equal to sn S5, obtaining the energy spectrum of the inner core block of the nonstandard fuel rod based on the age correction coefficient Y n C psn And E is connected with sn The relationship of (2) yields a non-standard fuel pellet enrichment. According to the age correction method, the age correction coefficient is obtained through synchronous detection and calculation of the multi-section standard fuel pellets, so that the correction enrichment degree of the non-standard fuel pellets is obtained, and the detection efficiency and the detection precision are improved.

Description

Passive detection age correction method for enrichment degree of fuel rod inner core block
Technical Field
The invention relates to the field of nondestructive testing of nuclear fuel rods, in particular to a passive age correction method for testing enrichment degree of inner core blocks of a fuel rod.
Background
The nuclear fuel rod is a unit body for releasing heat of the reactor, and is a core component of the reactor. The nuclear fuel rod is in a strong neutron field when the reactor runs, is subjected to scouring of high-temperature, high-pressure and high-flow-rate coolant, is subjected to chemical action of fissile substances and complicated mechanical load, is corroded by steam, and has very harsh working conditions. The inconsistent manufacturing characteristics such as the enrichment degree of the core blocks in the nuclear fuel rod and the design values can cause the core reactivity to deviate from the expected value, increase the control difficulty of the reactor and influence the operation of the reactor. Therefore, it is necessary to perform a 100% enrichment check on all pellets loaded inside the fuel rod after its assembly and before loading the fuel assembly.
Pellet UO 2 The U isotope in the powder is mainly 235 U and 238 u, after chemical conversion, along with UO 2 The two nuclides in the powder decay to generate daughter, the nuclide composition in the pellet gradually changes, and the isotope daughter reaches equilibrium after about 200 days. Due to 238 U decay chain nuclides 234m The change in the number of Pa-subunits results in a gradual increase in the gamma radioactivity of the pellet. If the fuel pellets are checked for passive enrichment during this period of time, the pellets need to be age-calibratedPositive to eliminate 234m Pa high energy characteristic gamma ray compton scattering superposition pair 235 Influence of the U-characteristic gamma-ray peak area.
The paper research on the influence of the age of the pellet on the detection of the enrichment degree of the fuel rod discloses a pellet age correction method, and correction coefficient calculation is carried out by adopting detection data of the same fuel rod at different ages. This method has mainly the following problems:
1. the detection waiting period of different ages is long, and if the equipment parameters such as the energy window size is changed, the detection needs to be carried out again;
2. the detection precision is low, the age correction coefficient precision is closely related to the detection period, and in the long-time waiting process, the equipment is difficult to be in the same state due to factors such as drifting of the nuclear electronic instrument or temperature and humidity change of a factory where a production line is located, so that the measurement uncertainty is increased, and the detection precision is reduced.
Patent CN115144426a discloses a nuclear fuel rod active detection method, comprising: acquiring characteristic gamma ray counting curves before and after activation of a standard nuclear fuel rod pellet, and acquiring characteristic gamma ray counting curves before and after activation of the nuclear fuel rod pellet to be tested; calculating characteristic gamma ray counting curves before and after activation of the standard nuclear fuel rod core blocks to obtain a final counting curve of the standard nuclear fuel rod, and calculating characteristic gamma ray counting curves before and after activation of the nuclear fuel rod core blocks to be detected to obtain a final counting curve of the nuclear fuel rod to be detected; calculating to obtain the abundance of the core blocks of the nuclear fuel rod to be detected, and judging whether the abundance of the core blocks of the nuclear fuel to be detected is qualified or not. The method is suitable for detecting the active enrichment degree of the nuclear fuel rod, and detectors are required to be respectively arranged for detection before and after the activation of the fuel rod, and then age correction coefficients are obtained through comparison of the count values of the detectors before and after the activation. Whereas passive enrichment detection does not involve activation of the fuel rod, enrichment detection is achieved using multiple detector arrays to detect characteristic gamma rays emitted by the fuel rod matrix. Active age correction methods are difficult to adapt to and detect passively.
In view of the above technical problems, the present invention is particularly directed.
Disclosure of Invention
The invention mainly aims to provide a passive detection age correction method for the enrichment degree of a fuel rod inner core block, which can realize rapid detection and ensure detection accuracy.
In order to achieve the above object, the present invention provides a passive detection age correction method for enrichment degree of inner core blocks of a fuel rod, comprising:
step S1, obtaining enrichment degree parameters E of a plurality of sections of standard fuel pellets sn ，
S2, testing the energy spectrum of the multi-section standard fuel core block to obtain a characteristic gamma-ray count value C sn ，
Step S3, selecting any two sections of the standard fuel pellets, and based on E of any two sections of the standard fuel pellets s1 ，C s1 ，E s2 ，C s2 Obtain the age correction coefficient Y n ，
Step S4, based on the age correction coefficient Y n Obtaining the multi-section standard fuel pellet 235 U characteristic gamma ray actual count value C psn And E is connected with sn Is used for the relation of the (c) to the (c),
s5, obtaining the energy spectrum of the non-standard fuel rod inner core block and based on an age correction coefficient Y n And the C psn And E is connected with sn The relationship of (2) yields a non-standard fuel pellet enrichment.
Further, step S2 includes:
step S21, dividing the energy spectrum into a first energy window A and a second energy window B, wherein the first energy window A covers 235 U gamma ray characteristic peak, second energy window B covers 234m Characteristic peaks or coverage of Pa gamma rays 234m The energy band affected by Pa-characteristic gamma-ray compton scattering,
step S22, respectively obtaining the characteristic gamma-ray count value C of the first energy window A sAn And a characteristic gamma-ray count value C of said second energy window B sBn 。
Further, step S3 includes:
step S31, respectively obtaining the standard fuel of the first sectionE of core block s51 ，E s81 ，C sA1 And E of the standard fuel pellet of the second section s52 ，E s82 ，C sA2 C sB2 Obtaining corrected E' s52 ，C′ sA2 ，C′ sB2 Said E is s81 ，E s82 The following relationship is satisfied:
E s81 ＝1-E s51 ，E s82 ＝1-E s52 ，
step S32, calculating a net count value C of 235U with an enrichment degree of 1% R ，
Step S33, obtaining an age correction coefficient Y of the first-stage standard fuel pellets and the second-stage standard fuel pellets 1 And Y 2 。
Further, in step S31,
E′ s52 ＝K*E s52 ,C′ sA2 ＝K*C sA2 ,C′ sB2 ＝K*C sB2 ,
wherein the correction coefficient is
Figure BDA0004119556840000041
Further, the net count value C in step S32 R Confirmation was made by the following formula:
Figure BDA0004119556840000042
further, Y is described in step S33 1 And said Y 2 Confirmation was made by the following formula:
Figure BDA0004119556840000043
further, step S3 further includes repeating steps S31-S33 to obtain any two other standard fuel pellets, and calculating an average age correction factor
Figure BDA0004119556840000044
/>
Figure BDA0004119556840000045
Further, in step S4C psn Confirmation was made by the following formula:
Figure BDA0004119556840000046
further, step S5 includes:
step S51, obtaining energy spectrums of non-standard fuel pellets, and respectively obtaining characteristic gamma-ray count values C of a first energy window A of the non-standard fuel pellets tAn And a characteristic gamma-ray count value C of said second energy window B tBn ，
Step S52, calculating the nonstandard fuel pellets 235 U characteristic gamma ray actual count value C ptn ,
Step S53, based on the characteristic gamma ray actual count value C ptn And C psn And E is connected with sn The relationship of (2) yields the enrichment of non-standard fuel pellets.
Further, in step S52C ptn Confirmed by the following formula:
Figure BDA0004119556840000051
further, the multiple segments of standard fuel pellets are integrated into the same fuel rod.
Further, the fuel rod at least comprises two sections of standard fuel pellets with different enrichment degrees.
Further, the E s51 E is more than or equal to 0.74 percent s5n ≤4.95％。
Based on the technical scheme, the invention has at least the following beneficial effects:
1. based on the enrichment degree value of the multi-section standard fuel rod and the characteristic gamma ray count value, the age correction coefficient of the passive enrichment degree detection equipment can be calculated in real time, the relation between the characteristic gamma ray actual count value and the enrichment degree is obtained, long-period waiting is not needed, and the detection efficiency is improved.
2. The detection values based on the multi-section standard fuel pellets are obtained by detecting the multi-section standard fuel pellets at the same time, so that the age correction coefficient is obtained, the interference of the external environment is reduced, and the detection precision is improved.
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The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a flowchart of a passive detection age correction method for fuel rod inner core block enrichment in an embodiment of the present application;
FIG. 2 is a flow chart II of a passive detection age correction method for fuel rod inner core block enrichment in an embodiment of the present application;
FIG. 3 is a graph of fuel rod inner core block energy spectrum in an embodiment of the present application;
FIG. 4 is a flow chart III of a passive detection age correction method for fuel rod inner core block enrichment in an embodiment of the present application;
FIG. 5 is a flow chart diagram of a passive detection age correction method for fuel rod inner core block enrichment in an embodiment of the present application;
FIG. 6 is a schematic illustration of a fuel rod core block structure in an embodiment of the present application.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
The invention is described in further detail below in connection with specific examples which are not to be construed as limiting the scope of the invention as claimed.
In the description, unless clearly indicated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Example 1:
the invention provides a passive detection age correction method for the enrichment degree of a fuel rod inner core block, which can realize rapid detection and ensure detection accuracy.
As shown in figure 1, the passive detection age correction method for the enrichment degree of the fuel rod core block specifically comprises the following steps of S1, obtaining an enrichment degree parameter E of a plurality of sections of standard fuel core blocks sn 。
Wherein the enrichment degree parameter E sn Included 235 U enrichment value E s5n And 238 u enrichment value E s8n ，E s5n And E is s8n The following relationships are satisfied: e (E) s8n ＝1-E s5n 。
The number of standard fuel pellet segments and specific numerical values of the enrichment degree are not limited in the application, and the number of standard fuel pellet segments can be increased in order to improve the accuracy of the age correction coefficient; and should ensure that standard fuel pellet segments are included that are at least two different enrichments. Preferably, multiple segments of standard fuel pellets are used, and the difference between the maximum and minimum enrichment values is increased, and standard fuel pellets of all enrichments may also be included. Preferably, E of each standard fuel pellet segment in the present application s5n E is more than or equal to 0.74 percent s5n ≤4.95％。
S2, testing the energy spectrum of the multi-section standard fuel core block to obtain a characteristic gamma-ray count value C sn 。
In one embodiment of this application, as shown in fig. 2, step S2 further includes step S21 of dividing the energy spectrum into a first energy window a and a second energy window B. Wherein the first energy window A covers 235 Characteristic peak of gamma ray of U. Second energy window B coverage 234m Characteristic peaks or coverage of Pa gamma rays 234m Pa characteristic gamma-ray compton scattering affects the energy band.
The division of the first energy window a and the second energy window B is further described below in connection with fig. 3.
The first energy window A selects a double peak or a single peak, and the lower threshold value of the second energy window B is higher than that of the first energy window A 235 The upper threshold value of the arbitrary position of the U-characteristic gamma ray energy peak can be smaller than 234m And (3) any position of the Pa characteristic gamma ray energy peak. The figures are only schematic, and the energy spectra of the fuel pellets of different enrichment are different.
In addition, step S2 further includes step S22 of obtaining the characteristic gamma-ray count values C of the first energy window a, respectively sAn And a characteristic gamma-ray count value C of a second energy window B sBn 。
And obtaining the characteristic gamma ray count values of the first energy window A and the second energy window B through the steps S1 and S2. Next, an age correction coefficient will be acquired based on the acquired above data.
Specifically comprises the step S3 of selecting any two sections of standard fuel pellets and E based on any two sections of standard fuel pellets s1 ，C s1 ，E s2 ，C s2 Obtain the age correction coefficient Y n . The age correction coefficient can be obtained through the conversion of the parameters of any two standard fuel pellets, so that the detection period and the detection workload are greatly reduced.
As shown in FIG. 4, step S3 includes step S31 of obtaining E of the first segment of standard fuel pellets, respectively s51 ，E s81 ，C sA1 C sB1 And E of second segment standard fuel pellets s52 ，E s82 ，C sA2 C sB2 Correcting parameters of the second section standard fuel pellets based on the parameters of the first section standard fuel pellets to obtain corrected E' s52 ，C′ sA2 ，C′ sB2 。
E s81 ，E s82 The following relationship is satisfied:
E s81 ＝1-E s51 ，E s82 ＝1-E s52
E′ s52 ，C′ sA2 ，C′ sB2 obtained by calculation of the following formula.
E′ s52 ＝K*E s52 ,C′ sA2 ＝K*C sA2 ,C′ sB2 ＝K*C sB2 ,
Wherein the correction coefficient is
Figure BDA0004119556840000091
Step S3 further includes step S32, calculating an enrichment of 1% 235 Net count value C of U R I.e. representing the number of units of enrichment count per increment 235 And increasing the characteristic gamma ray count value of the U first energy window A. Net count value C R Obtained by calculation of the following formula.
Figure BDA0004119556840000092
Step S3 further includes step S33 of obtaining age correction coefficients Y of the first segment of standard fuel pellets and the second segment of standard fuel pellets 1 And Y 2 。
Y in step S33 1 And Y 2 Confirmation was made by the following formula:
Figure BDA0004119556840000093
in order to further improve the accuracy of the age correction factor, any two other standard fuel pellets may be selected, the steps S31-S33 are repeated, and the average age correction factor is obtained by obtaining the average value through the following formula
Figure BDA0004119556840000101
Figure BDA0004119556840000102
Step S4, based on age correction coefficient Y n Obtaining multi-section standard fuel pellets 235 U characteristic gamma ray actual count value C psn 。C psn Can be obtained by calculation by the following formula. C (C) psn Indicating removal 234m Characteristic gamma rays of Pa affect purity 235 A count value of U. Preferably, the average age correction factor obtained by the above steps is calculated as C psn To increase C psn Is a precision of (a).
Figure BDA0004119556840000103
Further, based on the obtained multi-segment standard fuel pellets 235 U characteristic gamma ray actual count value C psn And multi-segment standard fuel pellet E sn And establishing a relation curve. Thus, a plurality of standard fuel pellets are detected by the steps, and removal is obtained based on the age correction coefficient 234m Affected by Pa-characteristic gamma rays 235 Actual count of characteristic gamma rays of U.
C obtained based on standard fuel pellets will next be described psn -E sn And carrying out enrichment parameter correction on the actual detection sample by the relation curve and the obtained age correction coefficient.
Specifically comprises the step S5 of obtaining the energy spectrum of a nonstandard fuel pellet and correcting the coefficient Y based on age n C psn And E is connected with sn The relationship of (2) yields a non-standard fuel pellet enrichment.
As shown in fig. 5, step S5 includes step S51 of acquiring energy spectrums of the nonstandard fuel pellets, and respectively acquiring characteristic gamma-ray count values C of a first energy window a of the nonstandard fuel pellets tAn And a characteristic gamma-ray count value C of a second energy window B tBn 。
Step S52, calculating nonstandard fuel pellets 235 U characteristic gamma ray actual count value C ptn 。C ptn Obtained by the following formula.
Figure BDA0004119556840000111
Step S53, based on the characteristic gamma ray actual count value C ptn And C psn And E is connected with sn The relationship of (2) yields the enrichment of non-standard fuel pellets. I.e. through C psn And E is connected with sn C is obtained from the relation curve of (2) ptn Corresponding corrected enrichment degree.
In the application, as shown in fig. 6, the multi-section standard fuel pellets are integrated in the same fuel rod, so that the energy spectrum of the multi-section standard fuel pellets can be obtained simultaneously through one-time detection, and the calibration efficiency and the detection precision are improved. In addition, a plurality of standard rods can be manufactured respectively, and each standard rod is filled with standard fuel pellets with the same enrichment degree.
In summary, from the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
1. based on the enrichment degree value of the multi-section standard fuel rod and the characteristic gamma ray count value, an age correction coefficient is calculated, and the relation between the characteristic gamma ray actual count value and the enrichment degree is obtained, so that the detection times are reduced, the detection period is shortened, and the detection efficiency is improved.
2. By detecting the multi-section standard fuel pellets simultaneously, the age correction coefficient is obtained based on the detection values of the multi-section standard fuel pellets, so that the interference of the external environment is reduced, and the detection precision is improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. The passive detection age correction method for the enrichment degree of the inner core block of the fuel rod is characterized by comprising the following steps of:
step S1, obtaining enrichment degree parameters E of a plurality of sections of standard fuel pellets sn ，
Step (a)S2, testing the energy spectrum of the multi-section standard fuel core block to obtain a characteristic Y-ray count value C sn ，
Step S3, selecting any two sections of the standard fuel pellets, and based on E of any two sections of the standard fuel pellets s1 ，C s1 ，E s2 ，C s2 Obtain the age correction coefficient Y n ，
Step S4, based on the age correction coefficient Y n Obtaining the multi-section standard fuel pellet 235 U characteristic gamma ray actual count value C psn And E is connected with sn Is used for the relation of the (c) to the (c),
s5, obtaining the energy spectrum of the non-standard fuel rod inner core block and based on an age correction coefficient Y n And the C psn And E is connected with sn The relationship of (2) yields a non-standard fuel pellet enrichment.
2. The passive detection age correction method for fuel rod inner core block enrichment according to claim 1, wherein step S2 comprises:
step S21, dividing the energy spectrum into a first energy window A and a second energy window B, wherein the first energy window A covers 235 U gamma ray characteristic peak, second energy window B covers 234m Characteristic peaks or coverage of Pa gamma rays 234m The energy band affected by Pa-characteristic gamma-ray compton scattering,
step S22, respectively obtaining the characteristic gamma-ray count value C of the first energy window A sAn And a characteristic gamma-ray count value C of said second energy window B sBn 。
3. The passive detection age correction method for fuel rod inner core block enrichment according to claim 2, wherein step S3 comprises:
step S31, respectively obtaining E of the standard fuel pellets of the first section s51 ，E s81 ，C sA1 And E of the standard fuel pellet of the second section s52 ，E s82 ，C sA2 And C sB2 Obtaining corrected E' s52 ，C′ sA2 ，C′ sB2 Said E is s81 ，E s82 The following relationship is satisfied:
E s81 ＝1-E s51 ，E s82 ＝1-E s52 ，
step S32, calculating the enrichment degree to be 1% 235 Net count value C of U R ，
Step S33, obtaining an age correction coefficient Y of the first-stage standard fuel pellets and the second-stage standard fuel pellets 1 And Y 2 。
4. The method for passively detecting age correction of enrichment of fuel rod inner core block according to claim 3, wherein in step S31,
E′ s52 ＝K*E s52 ，C′ sA2 ＝K*C sA2 ，C′ sB2 ＝K*C sB2 ，
wherein the correction coefficient is
Figure FDA0004119556820000031
5. The passive age correction method for detecting enrichment of fuel rod inner core block according to claim 4, wherein the net count value C in step S32 R Confirmation was made by the following formula:
Figure FDA0004119556820000032
6. the passive detection age correction method for fuel rod inner core block enrichment according to claim 5, wherein said Y in step S33 1 And said Y 2 Confirmation was made by the following formula:
Figure FDA0004119556820000033
7. the passive age correction method for detecting enrichment of fuel rod core block according to any one of claims 3-6, wherein step S3 further comprises repeating steps S31-S33 to obtain any two other standard fuel core blocks, and calculating an average age correction coefficient
Figure FDA0004119556820000034
Figure FDA0004119556820000035
8. The passive age correction method for detecting enrichment of fuel rod inner core block according to claim 7, wherein C in step S4 psn Confirmation was made by the following formula:
Figure FDA0004119556820000041
9. the passive detection age correction method of fuel rod inner core block enrichment according to claim 8, wherein step S5 includes:
step S51, obtaining energy spectrums of non-standard fuel pellets, and respectively obtaining characteristic gamma-ray count values C of a first energy window A of the non-standard fuel pellets tAn And a characteristic gamma-ray count value C of said second energy window B tBn ，
Step S52, calculating the nonstandard fuel pellets 235 U characteristic gamma ray actual count value C ptn ，
Step S53, based on the characteristic gamma ray actual count value C ptn And C psn And E is connected with sn The relationship of (2) yields the enrichment of non-standard fuel pellets.
10. The passive detection age correction for fuel rod inner core block enrichment of claim 9The method is characterized in that C in step S52 ptn Confirmed by the following formula:
Figure FDA0004119556820000042
11. the passive detection age correction method for fuel rod core block enrichment of any of claims 1-6, wherein said multiple segments of standard fuel core blocks are integrated into the same fuel rod.
12. The passive detection age correction method for fuel rod core block enrichment according to any one of claims 1-6, wherein the fuel rod comprises at least two standard fuel core blocks with different enrichment.
13. The passive detected age correction method for fuel rod enrichment according to any one of claims 1-6, wherein said E s5n E is more than or equal to 0.74 percent s5n ≤4.95％。
CN202310227805.9A 2023-03-02 2023-03-02 Passive detection age correction method for enrichment degree of fuel rod inner core block Pending CN116153537A (en)

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