CN107564594A - A kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent - Google Patents
A kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 57
- 238000011156 evaluation Methods 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 231
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000011067 equilibration Methods 0.000 claims abstract description 36
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 claims abstract description 20
- 230000004992 fission Effects 0.000 claims abstract description 16
- 239000012738 dissolution medium Substances 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 235000009518 sodium iodide Nutrition 0.000 claims abstract description 7
- 239000002609 medium Substances 0.000 claims description 120
- 239000007788 liquid Substances 0.000 claims description 110
- 230000000694 effects Effects 0.000 claims description 20
- 238000005070 sampling Methods 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims description 3
- 241001269238 Data Species 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- WTCBONOLBHEDIL-UHFFFAOYSA-M Sodium iodate Chemical compound [Na+].[O-]I(=O)=O WTCBONOLBHEDIL-UHFFFAOYSA-M 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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
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Abstract
The invention belongs to nuclear power station operation maintenance technical field, and in particular to a kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent.Comprise the following steps：The first step：It is determined that sobbing suction device offline, sob inhale in device offline, fuel assembly, which is placed on, to be sobbed in suction-chamber, heated up by water loop, Shi Chuo suction-chambers are in different temperatures platform, promote gas fission product to discharge into air circuit at fuel can cut, so as to by sodium iodide spectrometer continuous monitoring；Second step：Experimental condition is set；3rd step：Media type determines；4th step：Provide the cut equivalent weight range of burst slug, according to the first platform temperature, the second platform temperature, heating rate and dissolution medium type, with reference to burst slug cut equivalent and the equilibration time relation tables of Xe 133, provide the cut equivalent weight range of burst slug.There is fuel sheath failure in the first circulation of 1, No. 2 unit of Fuqing nuclear power, by the application of the inventive method, has found out damaged fuel assembly, and give the cut equivalent of burst slug.
Description
Technical field
The invention belongs to nuclear power station operation maintenance technical field, and in particular to a kind of fuel for nuclear power plant involucrum cut equivalent
Evaluation method.
Background technology
Study and find from open source information, frequently fired using the M310 types PWR nuclear power plant of AFA-3G type fuel assemblies
Expect clad failure, there is presently no the method that cut equivalent is clearly judged by offline sipping test, therefore need badly by total
The test data that recent M310 types presurized water reactor sobs suction offline is tied, with reference to Commissariat A L'Energie Atomique Ka Dalashi center (CEA
Cadarache) the simple explanation guide (simplified interpretation guide, hereinafter referred to as S.I.G.) of establishment,
Research and develop, design a kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent, with bright
Really offline sipping test judges the experimental condition and basis for estimation of fuel cut equivalent.
In order to realize this purpose, the present invention adopts the technical scheme that：
A kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent, comprises the following steps：
The first step：It is determined that suction device is sobbed offline
Offline sob is inhaled in device, and fuel assembly, which is placed on, to be sobbed in suction-chamber, is heated up by water loop, and Shi Chuo suction-chambers are in difference
Temperature platform, gas fission product is promoted to discharge into air circuit at fuel can cut, so as to continuous by sodium iodide spectrometer
Monitoring；
Water loop provides the power of circulation by water loop pump, maintains flow in setting range；Pass through heater and condensation
Device adjusts water loop temperature, it is ensured that sobs suction indoor temperature and meets test requirements document；
Air circuit provides the power of circulation by air circuit pump, maintains flow continuously to be supervised in setting range, sodium iodide spectrometer
Survey the gas fission product discharged from burst slug；When pressure inside fuel can is identical with the pressure for sobbing suction-chamber, gas
Xe-133 activity in loop reaches poised state, and by Xe-133, heating equilibration time T1 and second of heating balance for the first time
Time T2, judge the cut equivalent of fuel；
Xe-133 release kinetics profiles are the given datas that S.I.G. is provided, and wherein key parameter includes：First temperature
Platform, for the first time second temperature platform, heating equilibration time T1, second of heating equilibration time T2；Wherein, the first temperature is put down
Platform, second temperature platform are the determination value in curve, the equilibration time T1 of heating up for the first time be from heating time started first time to
First temperature platform Xe-133 activity reaches the time of balance, when since second of equilibration time T2 that heats up be heating up for second
Between reach time of balance to second temperature platform Xe-133 activity；
Second step：Experimental condition is set
Setting heating rate maintain 1 DEG C/min of one of following speed, 2 DEG C/min；
During weary pond temperature≤35 DEG C of fuel assembly storage, set the first temperature platform is as 55 DEG C, second temperature platform
80℃；
During 35 DEG C of the weary pond temperature ＞ of fuel assembly storage, set the first temperature platform is as 72 DEG C, second temperature platform
88℃；
3rd step：Media type determines
Liquid coolant and gas fission product inside burst slug involucrum be present, break location is different, according to fuel bag
The position of liquid in shell, its medium discharged include gas three types after liquid, gas, first liquid；
Gas fission product is Xe-133, and liquid fission product is I-131 and its isotope, Cs radio isotope；
The I- monitored by the Xe-133 release kinetics profile combination water loops manual sampling of air circuit continuous monitoring
131, Cs-134 and Cs-137 judges media type；
Artificial sampling analysis I-131, Cs-134+Cs-137 specific activity are respectively WS0, WSO before setting heating,；First
I-131 is analyzed in temperature platform manual sampling, and Cs-134+Cs-137 specific activity is respectively WS1, WS1,；Second temperature platform people
Work sampling analysis I-131, Cs-134+Cs-137 specific activity are respectively WS2, WS2,；
If WS1/WS0 ≈ 1 or WS1 ,/WS0, ≈ 1, then only gas release during heating up for the first time；
If WS1/WS0 ＞ 1.2 and WS1 ,/WS0, ＞ 1.2, then during heating up for the first time the medium that discharges for liquid or
Gas after first liquid, if gas after first liquid, Xe-133 release kinetics profiles have a hop, are no longer smooth songs
Line；
If WS2/WS1 ≈ 1 or WS2 ,/WS1, ≈ 1, then only gas release during second of heating；
If WS2/WS1 ＞ 1.2 and WS2 ,/WS1, ＞ 1.2, then second heat up during the medium that discharges for liquid or
Gas after first liquid, if gas after first liquid, Xe-133 release kinetics profiles have a hop, are no longer smooth songs
Line；
4th step：Provide the cut equivalent weight range of burst slug
Key parameter heating equilibration time T1 for the first time is extracted in the Xe-133 release kinetics profiles provided from S.I.G.
With second heating equilibration time T2, with reference to the first platform temperature, the second platform temperature, heating rate and dissolution medium type,
Make burst slug cut equivalent and Xe-133 equilibration time relation tables；
According to the first platform temperature, the second platform temperature, heating rate and dissolution medium type, with reference to burst slug cut
Equivalent and Xe-133 equilibration time relation tables, provide the cut equivalent weight range of burst slug.
Further, a kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent as described above, in the first step, water returns
Road provides the power of circulation by water loop pump, maintains flow in 5-6m3/h。
Further, a kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent as described above, in the first step, gas returns
Road provides the power of circulation by air circuit pump, maintains flow in 220-250L/h.
Further, a kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent as described above, in the 3rd step, WS1/
WS0 ≈ 1 refer to WS1/WS0=0.8~1.2, WS1,/WS0,≈ 1 refers to WS1 ,/WS0 ,=0.8~1.2, WS2/WS1 ≈ 1
WS2/WS1=0.8~1.2, WS2 are referred to ,/WS1,≈ 1 refers to WS2 ,/WS1 ,=0.8~1.2.
Further, a kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent as described above, in the first step, water returns
Road provides the power of circulation by water loop pump, maintains flow in 5-6m3/h；Air circuit provides the dynamic of circulation by air circuit pump
Power, flow is maintained in 220-250L/h；In 3rd step, if WS1/WS0 ＞ 1.2 and WS1 ,/WS0, ＞ 1.2, then rise for the first time
The medium discharged during temperature is gas after liquid or first liquid, is judged with reference to Xe-133 release kinetics profiles as follows：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, for the first time
The medium discharged during heating is gas after first liquid；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, for the first time
The medium discharged during heating is gas after first liquid；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, for the first time
The medium discharged during heating is gas after first liquid；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, for the first time
The medium discharged during heating is gas after first liquid；
5. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, for the first time
The medium discharged during heating is liquid；
6. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, for the first time
The medium discharged during heating is liquid；
7. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, for the first time
The medium discharged during heating is liquid；
8. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, for the first time
The medium discharged during heating is liquid.
Further, a kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent as described above, in the first step, water returns
Road provides the power of circulation by water loop pump, maintains flow in 5-6m3/h；Air circuit provides the dynamic of circulation by air circuit pump
Power, flow is maintained in 220-250L/h；If WS2/WS1 ＞ 1.2 and WS2 ,/WS1, ＞ 1.2, then discharged during second of heating
Medium be gas after liquid or first liquid, judge with reference to Xe-133 release kinetics profiles as follows：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, second
The medium discharged during heating is gas after first liquid；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, second
The medium discharged during heating is gas after first liquid；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, second
The medium discharged during heating is gas after first liquid；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, second
The medium discharged during heating is gas after first liquid；
5. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, second
The medium discharged during heating is liquid；
6. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, second
The medium discharged during heating is liquid；
7. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, second
The medium discharged during heating is liquid；
8. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, second
The medium discharged during heating is liquid.
Further, a kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent as described above, in the first step, water returns
Road provides the power of circulation by water loop pump, maintains flow in 5-6m3/h；Air circuit provides the dynamic of circulation by air circuit pump
Power, flow is maintained in 220-250L/h；In 3rd step, if WS1/WS0 ≈ 1 or WS1,/WS0,≈ 1, then during heating up for the first time
The medium of release is gas, then：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, for the first time
The medium discharged during heating is gas；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, for the first time
The medium discharged during heating is gas；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, for the first time
The medium discharged during heating is gas；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, for the first time
The medium discharged during heating is gas.
Further, a kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent as described above, in the first step, water returns
Road provides the power of circulation by water loop pump, maintains flow in 5-6m3/h；Air circuit provides the dynamic of circulation by air circuit pump
Power, flow is maintained in 220-250L/h；In 3rd step, if WS2/WS1 ≈ 1 or WS2,/WS1,≈ 1, then during second of heating
The medium of release is gas, then：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, second
The medium discharged during heating is gas；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, second
The medium discharged during heating is gas；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, second
The medium discharged during heating is gas；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, second
The medium discharged during heating is gas.
The beneficial effect of technical solution of the present invention is：There is fuel can and broken in the first circulation of 1, No. 2 unit of Fuqing nuclear power
Damage, by the application of the inventive method, has found out damaged fuel assembly, and give the cut equivalent of burst slug.
Brief description of the drawings
Fig. 1 is to sob suction schematic diagram of device offline；
Fig. 2 is typical Xe-133 release kinetics profiles；
Fig. 3 is the schematic diagram of burst slug dissolution medium.
Fig. 4 is breakage component YQF03G Xe-133 release kinetics profiles；
Fig. 5 is breakage component YQF04G Xe-133 release kinetics profiles；
Fig. 6 is breakage component YQF059 Xe-133 release kinetics profiles.
In 1- figures：Fuel assembly；
2- exchanges bubble；
The 3- gas compartments；
4- bottom temps, DEG C；
5- middle portion temperatures, DEG C；
6- bottom temps, DEG C；
7- water loop pumps；
8- water samplings point；
9- heaters and condenser；
10- flowmeters；
11- water loop temperature, DEG C；
12- water loops；
13- pressure gauges；
14- air circuit pumps；
15- flowmeters；
16- sodium iodide spectrometer measuring chambers；
17- air circuits.
Embodiment
Technical solution of the present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
A kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent of the present invention, comprises the following steps：
The first step：It is determined that suction device is sobbed offline
Inhaled as shown in figure 1, sobbing offline in device, fuel assembly, which is placed on, to be sobbed in suction-chamber, is heated up by water loop, makes to sob suction
Room is in different temperatures platform, promotes gas fission product to discharge into air circuit at fuel can cut, so as to by iodate
Sodium spectrometer continuous monitoring；
Water loop provides the power of circulation by water loop pump, maintains flow in 5-6m3/h；Pass through heater and condenser
Adjust water loop temperature, it is ensured that sob suction indoor temperature and meet test requirements document；
Air circuit provides the power of circulation by air circuit pump, maintains flow continuous in 220-250L/h, sodium iodide spectrometer
Monitor the gas fission product discharged from burst slug；When pressure inside fuel can is identical with the pressure for sobbing suction-chamber,
Xe-133 activity in air circuit reaches poised state, and by Xe-133, heating equilibration time T1 and second of heating are flat for the first time
Weigh time T2, judges the cut equivalent of fuel；
As shown in Fig. 2 Xe-133 release kinetics profiles are the given data that S.I.G. is provided, wherein key parameter bag
Include：First temperature platform, for the first time second temperature platform, heating equilibration time T1, second of heating equilibration time T2；Wherein,
First temperature platform, second temperature platform are the determination value in curve, and the equilibration time T1 that heats up for the first time is to be heated up from first time
Time started reaches the time of balance to the first temperature platform Xe-133 activity, and second of equilibration time T2 that heats up is from second
The heating time started reaches the time of balance to second temperature platform Xe-133 activity；
Second step：Experimental condition is set
Setting heating rate maintain 1 DEG C/min of one of following speed, 2 DEG C/min；
During weary pond temperature≤35 DEG C of fuel assembly storage, set the first temperature platform is as 55 DEG C, second temperature platform
80℃；
During 35 DEG C of the weary pond temperature ＞ of fuel assembly storage, set the first temperature platform is as 72 DEG C, second temperature platform
88℃；
3rd step：Media type determines
As shown in figure 3, liquid coolant and gas fission product inside burst slug involucrum be present, break location is different,
According to the position of liquid in fuel can, its medium discharged includes gas three types after liquid, gas, first liquid；
Gas fission product is Xe-133, and liquid fission product is I-131 and its isotope, Cs radio isotope；
The I- monitored by the Xe-133 release kinetics profile combination water loops manual sampling of air circuit continuous monitoring
131, Cs-134 and Cs-137 judges media type；
Artificial sampling analysis I-131, Cs-134+Cs-137 specific activity are respectively WS0, WSO before setting heating,；First
I-131 is analyzed in temperature platform manual sampling, and Cs-134+Cs-137 specific activity is respectively WS1, WS1,；Second temperature platform people
Work sampling analysis I-131, Cs-134+Cs-137 specific activity are respectively WS2, WS2,；If WS1/WS0 ≈ 1 or WS1,/WS0,
≈ 1, then only gas release during heating up for the first time；
In the present embodiment, WS1/WS0 ≈ 1 refer to WS1/WS0=0.8~1.2, WS1, and/WS0, ≈ 1 is referred to
WS1 ,/WS0 ,=0.8~1.2, WS2/WS1 ≈ 1 refer to WS2/WS1=0.8~1.2, WS2, and/WS1, ≈ 1 refers to WS2 ,/
WS1 ,=0.8~1.2.
In 3rd step, if WS1/WS0 ＞ 1.2 and WS1 ,/WS0, ＞ 1.2, then the medium discharged during heating up for the first time
For gas after liquid or first liquid, judge with reference to Xe-133 release kinetics profiles as follows：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, for the first time
The medium discharged during heating is gas after first liquid；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, for the first time
The medium discharged during heating is gas after first liquid；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, for the first time
The medium discharged during heating is gas after first liquid；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, for the first time
The medium discharged during heating is gas after first liquid；
5. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, for the first time
The medium discharged during heating is liquid；
6. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, for the first time
The medium discharged during heating is liquid；
7. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, for the first time
The medium discharged during heating is liquid；
8. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, for the first time
The medium discharged during heating is liquid；
In 3rd step, if WS2/WS1 ＞ 1.2 and WS2 ,/WS1, ＞ 1.2, then the medium discharged during second of heating
For gas after liquid or first liquid, judge with reference to Xe-133 release kinetics profiles as follows：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, second
The medium discharged during heating is gas after first liquid；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, second
The medium discharged during heating is gas after first liquid；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, second
The medium discharged during heating is gas after first liquid；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, second
The medium discharged during heating is gas after first liquid；
5. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, second
The medium discharged during heating is liquid；
6. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, second
The medium discharged during heating is liquid；
7. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, second
The medium discharged during heating is liquid；
8. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, second
The medium discharged during heating is liquid；
In 3rd step, if WS1/WS0 ≈ 1 or WS1 ,/WS0, ≈ 1, then the medium discharged during heating up for the first time is gas
Body, then：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, for the first time
The medium discharged during heating is gas；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, for the first time
The medium discharged during heating is gas；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, for the first time
The medium discharged during heating is gas；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, for the first time
The medium discharged during heating is gas；
In 3rd step, if WS2/WS1 ≈ 1 or WS2 ,/WS1, ≈ 1, then the medium discharged during second of heating is gas
Body, then：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, second
The medium discharged during heating is gas；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, second
The medium discharged during heating is gas；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, second
The medium discharged during heating is gas；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, second
The medium discharged during heating is gas.
4th step：Provide the cut equivalent weight range of burst slug
Key parameter heating equilibration time T1 for the first time is extracted in the Xe-133 release kinetics profiles provided from S.I.G.
With second heating equilibration time T2, with reference to the first platform temperature, the second platform temperature, heating rate and dissolution medium type,
Burst slug cut equivalent and Xe-133 equilibration time relation tables are made, is shown in Table 1.
The burst slug cut equivalent of table 1 and Xe-133 equilibration time relation tables
Table 1 gives cut equivalent ＜ 10um, 10-25um (at intervals of 5um), and during ＞ 25um, dissolution medium is gas
Equilibration time；Give cut equivalent ＜ 15um, 15-45um (at intervals of 5um), during ＞ 45um, dissolution medium is the flat of liquid
Weigh the time.Assuming that the cut equivalent of damaged fuel assembly is Φ.When T1 ＞ cut equivalent Φ B time TB, T1 ＜ cut equivalents
Φ A time TA, the then fuel cut equivalent Φ A ＜ Φ ＜ Φ B, similarly deduce the cut equivalent that equilibration time is T2, so
The union of above-mentioned two cut equivalent is sought afterwards.
According to the first platform temperature, the second platform temperature, heating rate and dissolution medium type, with reference to burst slug cut
Equivalent and Xe-133 equilibration time relation tables, provide the cut equivalent weight range of burst slug.
Below the inventive method is illustrated by taking three groups of breakage components in the nuclear power station of Fuqing as an example.
2 three groups of breakage component situations of table
In this three groups of breakage components, setting heating rate maintains 2 DEG C/min；
The I-131 specific activitys of each temperature platform of the burst slug of table 3
The Cs134+Cs137 specific activitys of each temperature platform of the burst slug of table 4
Fig. 4-6 is respectively breakage component YQF03G, YQF04G, YQF059 Xe-133 release kinetics profiles.
The media type of the burst slug of table 5
The heating-up time of the burst slug of table 6
For burst slug YQF03G, two temperature platform is respectively 72 DEG C and 88 DEG C, and heating rate is 2 DEG C/min,
Heating release for the first time is liquid, T1 28min, and eighth row in the table of comparisons 1, cut equivalent is between 35um-40um；Second
Secondary heating release is gas, T2 13min, the 4th row in the table of comparisons 1, T2<<Cut equivalent is 25um equilibration time, in table
The equilibration time of more large break fuel assembly is not given, therefore is defined by first time equilibration time, judges cut equivalent for 35um-
40um。
For burst slug YQF04G, the medium discharged during being heated up due to its first time is gas after first liquid, therefore
Judge to heat up equilibration time with second to judge during its cut equivalent, the 3rd row in the table of comparisons 1, its cut equivalent is 20um-
25um。
For burst slug YQF059, the 7th row in the table of comparisons 1 that heats up for the first time, the in second of table of comparisons 1 that heats up
3 rows, its cut equivalent are 25um-35um.
Claims (9)
1. a kind of evaluation method of fuel for nuclear power plant involucrum cut equivalent, it is characterised in that comprise the following steps：
The first step：It is determined that suction device is sobbed offline
Offline sob is inhaled in device, and fuel assembly, which is placed on, to be sobbed in suction-chamber, is heated up by water loop, and Shi Chuo suction-chambers are in different temperatures
Platform, gas fission product is promoted to discharge into air circuit at fuel can cut, so as to by sodium iodide spectrometer continuous monitoring；
Water loop provides the power of circulation by water loop pump, maintains flow in setting range；Adjusted by heater and condenser
Water saving loop temperature, it is ensured that sob suction indoor temperature and meet test requirements document；
Air circuit provides the power of circulation by air circuit pump, maintains flow in setting range, sodium iodide spectrometer continuous monitoring from
The gas fission product discharged in burst slug；When pressure inside fuel can is identical with the pressure for sobbing suction-chamber, air circuit
In Xe-133 activity reach poised state, pass through the Xe-133 equilibration times of the heatings of heating equilibration time T1 and second for the first time
T2, judge the cut equivalent of fuel；
Xe-133 release kinetics profiles are the given datas that S.I.G. is provided, and wherein key parameter includes：First temperature platform,
Second temperature platform, for the first time heating equilibration time T1, second of heating equilibration time T2；Wherein, the first temperature platform, second
Temperature platform is the determination value in curve, and the equilibration time T1 that heats up for the first time is from heating time started first time to the first temperature
Platform Xe-133 activity reaches the time of balance, and the second equilibration time T2 that heats up is from second of heating time started to second
Temperature platform Xe-133 activity reaches the time of balance；
Second step：Experimental condition is set
Setting heating rate maintain 1 DEG C/min of one of following speed, 2 DEG C/min；
Fuel assembly storage weary pond temperature≤35 DEG C when, set the first temperature platform as 55 DEG C, second temperature platform be 80 DEG C；
During 35 DEG C of the weary pond temperature ＞ of fuel assembly storage, set the first temperature platform as 72 DEG C, second temperature platform be 88 DEG C；
3rd step：Media type determines
Liquid coolant and gas fission product inside burst slug involucrum be present, break location is different, according in fuel can
The position of liquid, its medium discharged include gas three types after liquid, gas, first liquid；
Gas fission product is Xe-133, and liquid fission product is I-131 and its isotope, Cs radio isotope；
The I-131, Cs- monitored by the Xe-133 release kinetics profile combination water loops manual sampling of air circuit continuous monitoring
134 and Cs-137 judges media type；
Artificial sampling analysis I-131, Cs-134+Cs-137 specific activity are respectively WS0, WSO ' before setting heating；First temperature
I-131 is analyzed in platform manual sampling, and Cs-134+Cs-137 specific activity is respectively WS1, WS1 '；Second temperature platform manually takes
Sample analyzes I-131, and Cs-134+Cs-137 specific activity is respectively WS2, WS2 '；
If WS1/WS0 ≈ 1 or WS1 '/WS0 ' ≈ 1, only gas release during heating up for the first time；
If WS1/WS0 ＞ 1.2 and WS1 '/WS0 ' ＞ 1.2, the medium discharged during heating up for the first time is liquid or first liquid
Gas after body, if gas after first liquid, Xe-133 release kinetics profiles have a hop, are no longer smooth curves；
If WS2/WS1 ≈ 1 or WS2 '/WS1 ' ≈ 1, only gas release during second of heating；
If WS2/WS1 ＞ 1.2 and WS2 '/WS1 ' ＞ 1.2, the medium discharged during second of heating is liquid or first liquid
Gas after body, if gas after first liquid, Xe-133 release kinetics profiles have a hop, are no longer smooth curves；
4th step：Provide the cut equivalent weight range of burst slug
Key parameter heating equilibration time T1 and for the first time is extracted in the Xe-133 release kinetics profiles provided from S.I.G.
Secondary temperature elevation equilibration time T2, with reference to the first platform temperature, the second platform temperature, heating rate and dissolution medium type, make
Burst slug cut equivalent and Xe-133 equilibration time relation tables；
According to the first platform temperature, the second platform temperature, heating rate and dissolution medium type, with reference to burst slug cut equivalent
With Xe-133 equilibration time relation tables, the cut equivalent weight range of burst slug is provided.
A kind of 2. evaluation method of fuel for nuclear power plant involucrum cut equivalent as claimed in claim 1, it is characterised in that：The first step
In, water loop provides the power of circulation by water loop pump, maintains flow in 5-6m3/h。
A kind of 3. evaluation method of fuel for nuclear power plant involucrum cut equivalent as claimed in claim 1, it is characterised in that：The first step
In, air circuit provides the power of circulation by air circuit pump, maintains flow in 220-250L/h.
A kind of 4. evaluation method of fuel for nuclear power plant involucrum cut equivalent as claimed in claim 1, it is characterised in that：3rd step
In, WS1/WS0 ≈ 1 refer to that WS1/WS0=0.8~1.2, WS1 '/WS0 ' ≈ 1 refer to WS1 '/WS0 '=0.8~1.2,
WS2/WS1 ≈ 1 refer to that WS2/WS1=0.8~1.2, WS2 '/WS1 ' ≈ 1 refer to WS2 '/WS1 '=0.8~1.2.
A kind of 5. evaluation method of fuel for nuclear power plant involucrum cut equivalent as claimed in claim 1, it is characterised in that：The first step
In, water loop provides the power of circulation by water loop pump, maintains flow in 5-6m3/h；Air circuit is provided by air circuit pump
The power of circulation, flow is maintained in 220-250L/h；In 3rd step, if WS1/WS0 ＞ 1.2 and WS1 '/WS0 ' ＞ 1.2,
The medium discharged during heating up for the first time is gas after liquid or first liquid, is judged such as with reference to Xe-133 release kinetics profiles
Under：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, is heated up for the first time
The medium of period release is gas after first liquid；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, is heated up for the first time
The medium of period release is gas after first liquid；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, is heated up for the first time
The medium of period release is gas after first liquid；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, is heated up for the first time
The medium of period release is gas after first liquid；
5. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, is heated up for the first time
The period medium of release is liquid；
6. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, is heated up for the first time
The period medium of release is liquid；
7. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, is heated up for the first time
The period medium of release is liquid；
8. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, is heated up for the first time
The period medium of release is liquid.
A kind of 6. evaluation method of fuel for nuclear power plant involucrum cut equivalent as claimed in claim 1, it is characterised in that：The first step
In, water loop provides the power of circulation by water loop pump, maintains flow in 5-6m3/h；Air circuit is provided by air circuit pump
The power of circulation, flow is maintained in 220-250L/h；If WS2/WS1 ＞ 1.2 and WS2 '/WS1 ' ＞ 1.2, second of heating
The medium of period release is gas after liquid or first liquid, is judged with reference to Xe-133 release kinetics profiles as follows：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, second of heating
The medium of period release is gas after first liquid；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, second of heating
The medium of period release is gas after first liquid；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, second of heating
The medium of period release is gas after first liquid；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, second of heating
The medium of period release is gas after first liquid；
5. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, second of heating
The period medium of release is liquid；
6. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, second of heating
The period medium of release is liquid；
7. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, second of heating
The period medium of release is liquid；
8. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, second of heating
The period medium of release is liquid.
A kind of 7. evaluation method of fuel for nuclear power plant involucrum cut equivalent as claimed in claim 1, it is characterised in that：The first step
In, water loop provides the power of circulation by water loop pump, maintains flow in 5-6m3/h；Air circuit is provided by air circuit pump
The power of circulation, flow is maintained in 220-250L/h；In 3rd step, if WS1/WS0 ≈ 1 or WS1 '/WS0 ' ≈ 1, first
The medium discharged during secondary heating is gas, then：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, is heated up for the first time
The period medium of release is gas；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, is heated up for the first time
The period medium of release is gas；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, is heated up for the first time
The period medium of release is gas；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, is heated up for the first time
The period medium of release is gas.
A kind of 8. evaluation method of fuel for nuclear power plant involucrum cut equivalent as claimed in claim 1, it is characterised in that：The first step
In, water loop provides the power of circulation by water loop pump, maintains flow in 5-6m3/h；Air circuit is provided by air circuit pump
The power of circulation, flow is maintained in 220-250L/h；In 3rd step, if WS2/WS1 ≈ 1 or WS2 '/WS1 ' ≈ 1, second
The medium discharged during secondary heating is gas, then：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, second of heating
The period medium of release is gas；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, second of heating
The period medium of release is gas；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, second of heating
The period medium of release is gas；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, second of heating
The period medium of release is gas.
A kind of 9. evaluation method of fuel for nuclear power plant involucrum cut equivalent as claimed in claim 1, it is characterised in that：The first step
In, water loop provides the power of circulation by water loop pump, maintains flow in 5-6m3/h；Air circuit is provided by air circuit pump
The power of circulation, flow is maintained in 220-250L/h；
In 3rd step, if WS1/WS0 ＞ 1.2 and WS1 '/WS0 ' ＞ 1.2, the medium discharged during heating up for the first time is liquid
Gas after body or first liquid, judge with reference to Xe-133 release kinetics profiles as follows：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, is heated up for the first time
The medium of period release is gas after first liquid；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, is heated up for the first time
The medium of period release is gas after first liquid；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, is heated up for the first time
The medium of period release is gas after first liquid；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, is heated up for the first time
The medium of period release is gas after first liquid；
5. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, is heated up for the first time
The period medium of release is liquid；
6. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, is heated up for the first time
The period medium of release is liquid；
7. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, is heated up for the first time
The period medium of release is liquid；
8. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, is heated up for the first time
The period medium of release is liquid；
In 3rd step, if WS2/WS1 ＞ 1.2 and WS2 '/WS1 ' ＞ 1.2, the medium discharged during second of heating is liquid
Gas after body or first liquid, judge with reference to Xe-133 release kinetics profiles as follows：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, second of heating
The medium of period release is gas after first liquid；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, second of heating
The medium of period release is gas after first liquid；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, second of heating
The medium of period release is gas after first liquid；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, second of heating
The medium of period release is gas after first liquid；
5. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, second of heating
The period medium of release is liquid；
6. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, second of heating
The period medium of release is liquid；
7. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, second of heating
The period medium of release is liquid；
8. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, second of heating
The period medium of release is liquid；
In 3rd step, if WS1/WS0 ≈ 1 or WS1 '/WS0 ' ≈ 1, the medium discharged during heating up for the first time is gas,
Then：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, is heated up for the first time
The period medium of release is gas；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, is heated up for the first time
The period medium of release is gas；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, is heated up for the first time
The period medium of release is gas；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, is heated up for the first time
The period medium of release is gas；
In 3rd step, if WS2/WS1 ≈ 1 or WS2 '/WS1 ' ≈ 1, the medium discharged during second of heating is gas,
Then：
1. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 1 DEG C/min, second of heating
The period medium of release is gas；
2. when the first platform temperature is 55 DEG C, the second platform temperature is 80 DEG C, when heating rate is 2 DEG C/min, second of heating
The period medium of release is gas；
3. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 1 DEG C/min, second of heating
The period medium of release is gas；
4. when the first platform temperature is 72 DEG C, the second platform temperature is 88 DEG C, when heating rate is 2 DEG C/min, second of heating
The period medium of release is gas.
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