CN112393699A - Method for measuring and calculating axial elongation of heavy water reactor fuel channel - Google Patents
Method for measuring and calculating axial elongation of heavy water reactor fuel channel Download PDFInfo
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- CN112393699A CN112393699A CN201910742028.5A CN201910742028A CN112393699A CN 112393699 A CN112393699 A CN 112393699A CN 201910742028 A CN201910742028 A CN 201910742028A CN 112393699 A CN112393699 A CN 112393699A
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The invention relates to the technical field of heavy water reactor fuel channel measurement, and particularly discloses a method for measuring and calculating the axial elongation of a heavy water reactor fuel channel, which comprises the following steps: step 1: measuring the elongation of a fuel channel during the loading and unloading period of the unit; step 2: calculating the axial elongation of the fuel channel; and step 3: calculating the axial elongation rate of the fuel channel; and 4, step 4: and predicting the actual elongation of the fuel channel. The result obtained by the method of the invention has better conformity, and the measurement error is within 5 percent.
Description
Technical Field
The invention belongs to the technical field of heavy water reactor fuel channel measurement, and particularly relates to a method for measuring and calculating the axial elongation of a heavy water reactor fuel channel.
Background
The main loop equipment of the reactor core of the heavy water reactor in the Qinshan three-plant adopts horizontally-installed fuel channels, and each unit is provided with 380 fuel channels. As the operating time increases, the fuel passage undergoes axial elongation under the combined action of radiation creep and thermal creep. The maximum limit of axial elongation at the free end of the fuel passage is 86.5mm as designed, and if the fuel passage elongation exceeds this limit during operation, the outer and inner support bearings of the end piece will slip out of the liner and lose support. In addition, if the difference of the elongation of the adjacent fuel channels on the same end surface is larger than 25.4mm, the operation of the loading and unloading machine is affected.
The conventional method for measuring the length of the fuel channel is to actually measure the length of the pressure pipe after the fuel of the unit is taken out during the overhaul of the unit, but the method is high in cost and can only measure the length of a part of the fuel channel.
Disclosure of Invention
The invention aims to provide a method for measuring and calculating the axial elongation of a fuel channel of a heavy water reactor, so that the accuracy of a measuring result is improved.
The technical scheme of the invention is as follows:
a method for measuring and calculating the axial elongation of a fuel channel of a heavy water reactor comprises the following steps:
step 1: measuring the elongation of a fuel channel during the loading and unloading period of the unit;
step 2: calculating the axial elongation of the fuel channel;
and step 3: calculating the axial elongation rate of the fuel channel;
and 4, step 4: and predicting the actual elongation of the fuel channel.
The method specifically comprises the following steps:
step 1: elongation of fuel channel during assembly and unloading of measuring machine
Measuring the elongation of the ith fuel channel during loading and unloading of the unit by a loading and unloading machine (2), wherein the indication reading of the free end position of the ith fuel channel (1) on the A side is recorded as A in the second and later refueling operationiN(ii) a When the ith fuel channel (1) is subjected to the first refueling operation, the indication reading of the free end position on the side A is recorded as Bi; i is a fuel channel number, the value range is 1-380, and N represents the number of refueling times;
recording the number of days of equivalent full power of unit operation corresponding to the loading and unloading of the ith fuel channel as XiEFPD, according to the power level and running time of the unit, converting to the number of days corresponding to 100% full power running;
step 2: calculating fuel passage axial elongation
Free end axial elongation Y of fuel channeliMm, the calculation formula is as follows:
Yi＝[OCT2DEC(Bi)-OCT2DEC(Ai)]*0.625 (1)
in the formula (1), the reaction mixture is,
OCT2 DEC-octal to decimal function;
0.625-conversion factor, the decimal length change is 0.625mm when the octal reading changes once;
and step 3: calculation of Fuel passage axial elongation Rate
Using least square method to linear equation Yi＝ai+Vi*XiFitting coefficient a ofi、ViSolving to obtain the axial daily linear elongation rate V of the ith fuel passage A sidei；
And 4, step 4: predicting actual fuel passage elongation
Based on the linear daily elongation rate ViPredict at t1The elongation on the ith fuel passage a side on day.
Further comprising the step 5: predicting the axial extension residual life of the fuel channel;
on the basis of predicting the elongation of the fuel channel, the maximum allowable elongation of the single side of the fuel channel is 86.5mm, and the residual life S of the ith fuel channel can be predictedi prediction。
The specific calculation formula of step 3 is as follows:
in the formulas (2) and (3),
Vi-daily linear elongation rate of the ith fuel passage, mm/EFPD;
ai—Xithe elongation corresponding to the ith fuel passage at the original zero point;
n-number of reloading.
The specific formula of step 4 is as follows:
Yi prediction＝Vi*t1 (4)
In the formula (4), the reaction mixture is,
Yi prediction-predicting the axial elongation, mm, of the channel i;
t1-predicted runtime point, EFPD, as a positive integer.
The specific formula of step 5 is as follows:
Si prediction＝(86.5-Vi*t2)/(Vi*365) (5)
In the formula (5), the reaction mixture is,
86.5-maximum allowable elongation of single side of fuel channel, mm, is constant;
t2current actual running timePoint, EFPD, is a positive integer.
In the step 1, during the running period of the unit, 10 fuel channels are selected from 380 fuel channels every week for refueling operation, and 1-2 times of refueling operation are performed on each fuel channel every year;
when the fuel handling machine leans against the fuel channel end part, the nozzle of the fuel handling machine is clamped on the fuel channel end part in a holding manner, so that the fuel handling machine and the fuel channel end part are fixed; in this case, the loader will record an indication of the position of the loader shaft encoder at each of the free end a and the fixed end C of the fuel channel, which position is also in fact the position of the fuel channel end piece.
Daily linear elongation rate V calculated by formulaiThe linear annual elongation rate is obtained by multiplying 365.
The annual linear elongation rate of a fuel channel is correlated to the fuel channel power, with higher power fuel channels having a greater elongation rate due to greater exposure to radiation creep and vice versa.
The invention has the following remarkable effects:
(1) the result obtained by the method of the invention has better conformity, and the measurement error is within 5 percent.
(2) According to the elongation limit value of 86.5mm on one side of the fuel channel, the method can predict the service life of the fuel channel before reaching the elongation limit value, namely the number of years of the residual equivalent full power of the unit.
(3) The method can accurately monitor the axial elongation of the fuel channel.
(4) The method can quickly evaluate the axial elongation rate of the fuel channel.
Drawings
FIG. 1 is a flow chart of fuel passage axial elongation data calculation;
fig. 2 is a schematic view of a fuel channel and handler arrangement.
In the figure: 1. a fuel passage; 2. loading and unloading machines; 3. a material loading and unloading machine pulley; 4. a calandria container; 5. a loader shaft encoder; 6. a nozzle of a loading and unloading machine; 7. a fuel passage end piece.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
A method for measuring and calculating the axial elongation of a fuel channel of a heavy water reactor as shown in fig. 1 comprises the following steps:
step 1: elongation of fuel channel during assembly and unloading of measuring machine
During the operation of the unit, 10 channels are selected from 380 fuel channels every week for refueling operation, and 1-2 times of refueling operation are performed on each fuel channel every year. As shown in fig. 2, the calandria 4 is horizontally arranged, and the fuel channel 1 is supported by means of the tube plate of the calandria 4. During refueling operation, the loading and unloading machine 2 moves simultaneously along with the loading and unloading machine trolley 3 on two sides of the fuel channel 1, when the loading and unloading machine 2 moves to the corresponding fuel channel end part 7 after moving to the specified fuel channel 1, and when the loading and unloading machine 2 leans against the fuel channel end part 7, the loading and unloading machine nozzle 6 is clamped on the fuel channel end part 7 in a clasping manner, so that the loading and unloading machine 2 and the fuel channel end part 7 are fixed; at this time, the handler 2 records an indication of the position of the handler shaft encoder 5, which is also actually the position of the fuel passage end member 7, on each of the a-side free end and the C-side fixed end of the fuel passage 1.
Wherein, the free end position indication reading at the A side of the ith fuel passage 1 at the second and later fuel change operation is recorded as AiNN represents the number of times of refueling; when the ith fuel channel 1 is subjected to the first refueling operation, the indication reading of the free end position on the side A is recorded as Bi; and i is a fuel channel number and has a value range of 1-380. Recording the number of days of equivalent full power of unit operation corresponding to the loading and unloading of the ith fuel channel as XiAnd EFPD, according to the power level and the running time of the unit, converting to the number of days corresponding to 100% full power running.
Step 2: calculating fuel passage axial elongation
Free end axial elongation Y of fuel channeliMm, the calculation formula is as follows:
Yi＝[OCT2DEC(Bi)-OCT2DEC(AiN)]*0.625 (1)
in the formula (1), the reaction mixture is,
OCT2 DEC-octal to decimal function;
0.625-conversion factor, the decimal length change is 0.625mm when the octal reading changes once;
and step 3: calculation of Fuel passage axial elongation Rate
Using least square method to linear equation Yi＝ai+Vi*XiFitting coefficient a ofi、ViSolving to obtain the axial daily linear elongation rate V of the ith fuel passage A sideiThe specific calculation formula is as follows:
in the formulas (2) and (3),
Vi-daily linear elongation rate of the ith fuel passage, mm/EFPD;
ai—Xithe elongation corresponding to the ith fuel passage at the original zero point;
n-number of times of reloading;
when the annual linear elongation rate is to be calculated, the daily linear elongation rate V calculated by the equation (2)iAnd multiplying by 365.
It was also found by statistical analysis that: the annual linear elongation rate of a channel is correlated to the channel power, i.e., a high power fuel channel has a greater elongation rate due to greater exposure to radiation creep and vice versa.
And 4, step 4: predicting actual fuel passage elongation
Based on the linear daily elongation rate ViPredictionAt the t th1In the daytime, the elongation of the ith fuel passage A side is specifically represented by the following formula:
Yi prediction＝Vi*t1 (4)
In the formula (4), the reaction mixture is,
Yi prediction-predicting the axial elongation, mm, of the channel i;
t1-predicted runtime point, EFPD, as a positive integer.
And 5: predicting fuel passage axial elongation remaining life
On the basis of predicting the elongation of the fuel channel, the maximum allowable elongation of the single side of the fuel channel is 86.5mm, and the residual life S of the ith fuel channel can be predictedi predictionThe concrete formula is as follows:
Si prediction＝(86.5-Vi*t2)/(Vi*365) (5)
In the formula (5), the reaction mixture is,
86.5-maximum allowable elongation of single side of fuel channel, mm, is constant;
t2-the current actual point in time of operation, EFPD, is a positive integer.
Claims (10)
1. A method for measuring and calculating the axial elongation of a fuel channel of a heavy water reactor is characterized by comprising the following steps: the method comprises the following steps:
step 1: measuring the elongation of a fuel channel during the loading and unloading period of the unit;
step 2: calculating the axial elongation of the fuel channel;
and step 3: calculating the axial elongation rate of the fuel channel;
and 4, step 4: and predicting the actual elongation of the fuel channel.
2. The method for measuring and calculating the axial elongation of the fuel channel of the heavy water reactor as claimed in claim 1, wherein: the method specifically comprises the following steps:
step 1: elongation of fuel channel during assembly and unloading of measuring machine
The material loading and unloading of the machine set are measured through the material loading and unloading machine (2)During the period of the elongation of the ith fuel passage, wherein the free end position indication reading on the A side of the ith fuel passage (1) at the second and later refueling operation is recorded as AiN(ii) a When the ith fuel channel (1) is subjected to the first refueling operation, the indication reading of the free end position on the side A is recorded as Bi; i is a fuel channel number, the value range is 1-380, and N represents the number of refueling times;
recording the number of days of equivalent full power of unit operation corresponding to the loading and unloading of the ith fuel channel as XiEFPD, according to the power level and running time of the unit, converting to the number of days corresponding to 100% full power running;
step 2: calculating fuel passage axial elongation
Free end axial elongation Y of fuel channeliMm, the calculation formula is as follows:
Yi＝[OCT2DEC(Bi)-OCT2DEC(Ai)]*0.625 (1)
in the formula (1), the reaction mixture is,
OCT2 DEC-octal to decimal function;
0.625-conversion factor, the decimal length change is 0.625mm when the octal reading changes once;
and step 3: calculation of Fuel passage axial elongation Rate
Using least square method to linear equation Yi＝ai+Vi*XiFitting coefficient a ofi、ViSolving to obtain the axial daily linear elongation rate V of the ith fuel passage A sidei；
And 4, step 4: predicting actual fuel passage elongation
Based on the linear daily elongation rate ViPredict at t1The elongation on the ith fuel passage a side on day.
3. A method of measuring and calculating the axial elongation of a fuel channel of a heavy water reactor as defined in claim 2, wherein: further comprising the step 5: predicting the axial extension residual life of the fuel channel;
on the basis of the predicted fuel passage elongation,the residual life S of the ith fuel passage can be predicted by combining the maximum allowable elongation of one side of the fuel passage by 86.5mmi prediction。
4. A method of measuring and calculating the axial elongation of a fuel channel of a heavy water reactor as defined in claim 3, wherein: the specific calculation formula of step 3 is as follows:
in the formulas (2) and (3),
Vi-daily linear elongation rate of the ith fuel passage, mm/EFPD;
ai—Xithe elongation corresponding to the ith fuel passage at the original zero point;
n-number of reloading.
5. The method for measuring and calculating the axial elongation of the fuel channel of the heavy water reactor as claimed in claim 4, wherein: the specific formula of step 4 is as follows:
Yi prediction＝Vi*t1 (4)
In the formula (4), the reaction mixture is,
Yi prediction-predicting the axial elongation, mm, of the channel i;
t1-predicted runtime point, EFPD, as a positive integer.
6. The method for measuring and calculating the axial elongation of the fuel channel of the heavy water reactor as claimed in claim 5, wherein: the specific formula of step 5 is as follows:
Si prediction＝(86.5-Vi*t2)/(Vi*365) (5)
In the formula (5), the reaction mixture is,
86.5-maximum allowable elongation of single side of fuel channel, mm, is constant;
t2-the current actual point in time of operation, EFPD, is a positive integer.
7. The method for measuring and calculating the axial elongation of the fuel channel of the heavy water reactor as claimed in claim 6, wherein: in the step 1, 10 fuel channels are selected from 380 fuel channels every week for refueling operation during the running period of the unit, and 1-2 refueling operations are performed on each fuel channel every year.
8. The method for measuring and calculating the axial elongation of the fuel channel of the heavy water reactor as claimed in claim 7, wherein: in the step 1, during refueling operation, a material loading and unloading machine (2) moves simultaneously along with a material loading and unloading machine pulley (3) on two sides of a fuel channel (1), when the material loading and unloading machine moves to a specified fuel channel (1), the material loading and unloading machine (2) moves to a corresponding fuel channel end part (7), and when the material loading and unloading machine (2) leans against the fuel channel end part (7), a material loading and unloading machine nozzle (6) is clamped on the fuel channel end part (7) in a surrounding manner, so that the material loading and unloading machine (2) is fixed with the fuel channel end part (7); at this time, the loader (2) records an indication of the position of the loader shaft encoder (5) at each of the A-side free end and the C-side fixed end of the fuel passage (1), which is also the position of the fuel passage end member (7).
9. The method for measuring and calculating the axial elongation of the fuel channel of the heavy water reactor as claimed in claim 8, wherein: the daily linear elongation rate V calculated by the formula (2)iThe linear annual elongation rate is obtained by multiplying 365.
10. A method of measuring and calculating the axial elongation of a fuel channel of a heavy water reactor as defined in claim 9, wherein: the annual linear elongation rate of a fuel channel is correlated to the fuel channel power, with higher power fuel channels having a greater elongation rate due to greater exposure to radiation creep and vice versa.
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