ML19211C457
| ML19211C457 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 12/31/1979 |
| From: | CONSOLIDATED EDISON CO. OF NEW YORK, INC., NAC INTERNATIONAL INC. (FORMERLY NUCLEAR ASSURANCE |
| To: | |
| Shared Package | |
| ML100321057 | List: |
| References | |
| NUDOCS 8001110428 | |
| Download: ML19211C457 (125) | |
Text
-
t INDIAN POINT UNIT NO. 2 VISt1AL FUEL INSPECTION CYCLE 3/4 PIFUELING This report was prepared with the participation of Nuclear Assurance Corporation of Atlanta, Georgia Consolidated Edison Company of New York, Inc.
Docket No. 50-247 December, 1979 1735 035 8001110 i-/ 2 P
9 FUEL INSPECTION REPORT Consolidated Edison Company Indian Point Unit 2 Section Page
SUMMARY
l FUEL INSPECTION EQUIPMENT DESCRIPTION 4
SYSTEM QUALIFICATION 7
Qualification 7
System Requalification 22 Comparison or Rod Closure Measurements 24 FUEL INSPECTION METHODS 32 Visual Examination 32 Dimensional Measurements 33 RESULTS 35 Visual Examination 35 Rod Closure 39 Rod Length 76 Assembly Bow 86 Guide Thimble Length 94 Assembly Twist 96 1735 036 i
9 LIST OF TABLES Number Title Page 7
1 System Qualification Summary 2
Qualification Data - Length Measurements 11 15 3
Qualification Data - Width Measurements 18 4
Bow Qualification 5
Known Distance Measurements During 23 Fuel Inspection 6
Tape Catalog of the Eight Fuel Assemblies 36 Inspected 7a Rod Closure Measurements at 36.5K Burnup 39 7b Rod Closure Measurements at 25K Burnup 40 7c Rod Closure Measurements at 13K Burnup 40 8
Rod Closure Versus Grid Location 41 9a Rod Closure Versus Grid Location at 36.5K Burnup 41 Sb Rod Closure Versus Grid Location at 25K Burnup 42 9e Rod Closure Versus Grid Location at 13K Burnup 42 10 Rod Closure Summary 43 11 Rod Length Statistical Results 76 12 Temperature Correction for Rod Length 79 Measurements 13 Rod Length Summary 80 14 Maximum Assembly Bow 86 15 Average Guide Thimble Lengths Measured for the Seven Fuel Assemblies Examined 94 16 Guide Thimble Lengths 95 17 Indian Point Unit 2 Assembly Twist 96 18 Assembly Twist Raw Data 97 1735.037 ii
s LIST OF FIGURES Number Title Page 1
Fuel In:p -
_1 Stand 6
2 Leni... Measu;2 meat Linearity 13 3
Length anlification Bias and Standard Deviation 14 4
Width Measurement Linearity 16 5
Width Qualification Bias and Standard Deviation 17 6
Bow Qualification for System Runout 17 7
Bow Qualification for System Runout Corrected for Tilt 20 8
Runout Qualification for Length Qualification 21 9
Frequency Histogram Of the Variation Between Original and Repeat Rod Closure 25 10 Rod Closure of Rods 8 and 9, Between Grids 7 and 8, Face 2, Assembly E-38 26 11 Rod Closure of Rods 12 and 13, Between Grids 2 and 3, Face 1, Assembly D-71 27 12 Rod Closure of rods 6 and 7, Between Grids 5 and 6, Face 2, Assembly D-11 28 13 Rod Closure of Rods 11 and 12, Between Grids 2 and 3, Face 1, Assembly C-06 29 14 Rod Closure of Rods 1 and 2, Between Grids 4 and 5, Face 1, Assembly B-49 30 15 Rod Closure of Rods 10 and 11, Between Grids 31 2 and 3, Face 1, Assembly B-41 16 Fuel Assembly Face Orientation 32 17 Histogram of the Rod Closure Measured at IP#2 at the End of Cycle 3 47 18a Histogram of the Rod Closure Measured Within Grid Span 1 ( 36,500 MWD /MTU) 48 1Bb Histogram of the Rod Closure Measured Within Grid Span 1 ( 25,000 MWD /MTU) 49 iii
LIST OF FIGURES (Continued)
Number Title Pace 18c Histogram of the Rod Closure Measured Within Grid Span 1 ( 13,000 MWD /MTU) 50 19a Histogram of the Rod Closure Measured Within Grid Span 2 ( 36,500 MWD /MTU) 51 19b Histogram of the Rod Closure Measured Within Grid Span 2 ( 25,000 MWD /MTU) 52 19c Histogram of the Rod Closure Measured Within Grid Span 2 ( 13,000 MWD /MTU) 53 20a Histogram of the Rod Closure Measured Within Grid Span 3 ( 36,500 MWD /MTU) 54 20b Histogram of the Rod Closure Measured Within Grid Span 3 ( 25,000 MWD /MTU) 55 20c Histogram of the Rod Closure Measured Within Grid Span 3 ( 13,000 MWD /MTU) 56 21a Histogram of the Rod Closure Measured Within Grid Span 4 ( 36,500 MWD /MTU) 57 21b Histogram of the Rod Closure Measured Within Grid Span 4 ( 25,000 MWD /MTU) 58 21c Histogram of the Rod Closure Measured Within Grid Span 4 ( 13,000 MWD /MTU) 59 22a Histogram of the Rod Closure Measured Within Grid Span 5 ( 36,500 MWD /MTU) 60 22b Histogram of the Rod Closure Measured Within Grid Span 5 ( 25,000 MWD /MTU) 61 23a Histogram of the Rod Closure Measured Within Grid Span 6 ( 36,500 MWD /MTU) 62 23b Histogram of the Rod Closure Measured Within Grid Span 6 ( 25,000 MWD /MTU) 63 23c Histogram of the Rod Closure Measured Within Grid Span 6 ( 43,000 MWD /MTU) 64 24a Histogram of the Rod Closure Measured Within Grid Span 7 ( 36,500 MWD /MTU) 65 iv 1735 039
LIST OF FIGURES (Continued)
Number Title Page 25a Histogram of the Rod Closure Measured Within Grid Span 8 ( 36,000 MWD /MTU) 68 25b Histogram of the Rod Closure Measured Within Grid Span 8 ( 25,000 MWD /MTU) 69 25c Histogram of the Rod Closure Measured Eithin Grid Span 8 ( 13,000 MWD /MTU) 70 26 Histogram of the Rod Closure Measurements for "B" Assemblies 71 27 Histogram of the Rod Closure Measurements for "C" Assemblies 72 27a Histogram of the Rod Closure Measurements for "B & C" Assemblies 73 28 Histogram of the Rod Closure Measurements for "D" Assemblies 74 29 Histogram of the Rod Closure Measurements.for "E" Assemblies 75 30 Rod Length of "B" Assemblies 81 31 Rod Length of "C" Assemblies 82 32 Rod Length of "D" Assemblies 83 33 Rod Length of "E" Assemblies 84 34 Rod Length of "D & E" Assemblies 85 35 Assembly Bow of Face 4, Assembly B-41 87 36 Assembly Bow of Face 3, Assembly B-49 88 37 Assembly Bow of Face 1, Assembly C-06 89 38 Assembly Bow of Face 1, Assembly C-23 90 39 Assembly Bow of Face 1, Assembly D-ll 91 40 Assembly Bow of Face 1, Assembly D-71 92 41 Assembly Bow of Face 1, Assembly E-38 93 v
1735 040
SUMMARY
A visual fuel inspection of the two i burnup assemblies from each region in the core at Indian Point Unit No. 2 was completed on July 27, 1979 during the third refueling outage.
The following assemblies listed with their approximate burnups at the end of cycle 3 were inspected:
Assembly Burnup (MWD /MTU)
B-49 36000 B-41 36000 C-23 37000 C-06 37000 D-ll 25000 D-71 25000 E-49 13000 E-38 13000 The television examination of the peripheral rods of these fuel assemblies indicated that the overall condition was excellent, with light to medium patchy oxide covering the active fuel cladding surfaces.
The crud layer on the peripheral rods' surface appeared to be thin; hower, some crud spalling was caserved.
A partial fret of insignificant amount we.s seen in the end cap area of a rod in D-11.
A few rods mostly in "B" and "C" assem-blies were observed to be either touching or almost touching both upper and lower nozzles.
One assembly (B-41) 1735 041
contained two rods that were bowed (interference bowing) sufficiently to be touching their adjacent rods.
Dimensional measurements were performed on 7* of the 8 as-semblies inspected employing a camera capable of high mag-nification mounted on a movable carriage.
With the exceptions previously noted, minimal rod closure of the peripheral rods was observed. Rod closure measurements (defined as the minimum projected spacing or gap between two adjacent fuel rods and two successive grids) were performed on a predetermined random basis to get a good statistical representation of the typical rod closure seen in these fuel assemblies.
The average rod closure for the 172 slots examined was 0.1182 inches, which would indicat a 16% closure between the two rods.
Since the measured average rod closures for Regions B,C,D, and E assemblies were 0.1135, 0.1184, 0.1208, and 0.1211 inches respectively, no burnup dependence of the rod closure was seen in this inspection.
Dimensional measurements of rod lengths, guide thimble length, assembly bow, and assembly twist were made.
Analysis of the dimensione1 results indicated that (1) average rod growth from as-built of -the "B",
"C",
"D", and "E" assemblies were 0.928, 0.791, 0.665, and 0.497 inches, respectively, (2) the maximum assembly bow was 0.185 inches, (3) the average guide-thimble length for "B",
"C",
"D",
and "E" assemblies were 150.499, 150.557, 150.558, and 150.858 inches, respectively, and (4) the maximum assembly twist was 5.11.
" Dimensional measurements were not taken on E-49 due to technical difficulties. 1735 042
In conclusion, no evidence of fuel cladding failure or any other condition (such as clad flattening) that could lead to unacceptable fuel performance was observed on the 8 fuel assemblies examined.
1735 043 FUEL INSPECTION EQUIPMENT DESCRIPTION The fuel inspection system consists of two major modules:
(1) an underwater three-dimensional traversing camera module, and (2) a control, monitoring, and data reduction module (see Figure 1).
The underwater t:' ree-dimensional traversing camera module is attached to, and fits within, the common spent fuel examina-tion stand.
The stand, along with the camera module, is placed on the bottom of the spent fuel pool floor.
A fuel assembly is lowered into the support basket.
The basket can be rotated by the operator so as to expose all sides of the fuel assembly to the television cameras.
Two television cameras (one as backup) are mounted on the module and traverse the entire length and width dimensions of the fuel assenbly allowing for examination of all peripheral rods.
The third dimension (optical) movement capability of the module allows reduction of field of view from a full face to a~ detailed individual rod scan.
As che fuel assembly is being scanned, precise porition measurements are superimposed on the visual display at the control, monitoring, and data reduction module.
Selected position measurements from this display are utilized in the dimensional characterization of the individual peri-pheral fuel rods or of the assembly.
These measurements for specific dimensional analysis may be auuomatically reduced and 1735 044.
converted to a finished format by utilization of a mini-computer system.
The mini-computer system consists of a nini-computer, plotter, and computer program software.
The mini-computer is electroni-cally interfaced with the position measuring devices which are a part of the underwater three-dimensional traversing mecha-nism.
The position information is stored in the computer memory for processing by the software programs.
These are data reduction programs-for system calibration and fuel assembly dimensional measurement.
The mini-computer is ecuipped with an auxiliary plotter for rapid display of engineering drta immediately after a particular dimensional measurement has been completed.
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SYSTEM QUALIFICATION Qualification The visual inspection sy.mtem was qualified at Indian Point during the first week of July 1979 for width, length, and bow system runout.
Table 1 is a summary of the system's bias and precision results.
TABLE 1 SYSTEM QUALIFICATION
SUMMARY
Bias Precision (Inc.hes )
(Inches)
One Sigma Two Sigma Length
< 0.0001
- 0.0067 0.0134 width
<t0.0001 0.0027
- 0.0054 t.0134 System Runout <t0.0001
- 0.0067 0
The precision of system runout is limited by the degree of poly-nomial fit.
The precision could be improved by increasing (1) the number of data points taken and (2) the degree of poly-nomial regression analysis available.
The system runout precision should approach that of the width precision.
- However, because of the way the system runout is calculated, the magni-tude of system runout precision will be greater than the width precision.
The fuel inspection stand was set up in a vertical' position and legs leveled by adjusting the (stand) feet.
Using a bubble 1735 047 6
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level, the television carriage (vertical) tracks were made vertical by adjusting the stand's feet.
After the stand was properly aligned, the fuel assembly support basket was then leveled.
At this time, the calibration standard was installed into the basket and also made vertical by adjusting its feet.
The first step to qualify the system was to determine the relationship of the vertical encoder to the standard's vertical scale.
Encoder readings were taken at various positions over the entire length of the scale and then reduced using a calcu-7 lation program to determine the bias and precision of the system.
A linear least squares fit of the data was first performed to determine the relationship between the scale and encoder read-ings.
This fit (Figure 2 ) indicated the vertical encoder readings had to be multiplied by 1.0009 to correct the reading of the vertical position in inches.
The data in Tab?.e 2 were reduced to determine the reading bias, if any, and precision.
The difference between the predicted value and the corrected encoder reading was used to determine the measurement error of the system.
Figure 3 is a frequency histogram of the measure-ment errors incurred during the length qualification.
The data reduction showed < 0.0001 inches system bias and a pre-a cision of -0.0067 inches at the one sigma level.
Using the same calculator program as for length qualifica-tion, encoder width measurements were qualified.
Multiple measurements shown in Table 3 wera made to determine to the encoder correction factor, bias, and precision of the system.
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correlation between the encoder reading and scale position.
This indicates that a 0.9985 correction factor was requifed
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to inches.
Further data reduction, Figure 5, showed <.i0. 0001 I.0027 inches at the inches bias and a precision factor of 0
one sigma level.
After both encoders were calibrated for length and width measure-ments, the system for bow measurement was qualified.
Qualifi-cation of the system for bow measurement was done in two steps; one to determine the runout of the mechanical system, and the other to determine the reading bias and precision.
Incorporated within the standard is a 0.012 inch thick multiple strand wire stretched over the length to be measured for bow.
Axial and vertical positions were taken at various points along this stretched wire to determine the system runout.
These measure-ments (shown in Table 4) were taken by aligning the right side of the vertical crosshair imposed on the vertical television screen with the left side of the stretched wire and then re-cording the x and y positions.
A polynomial regression analysis was used to best fit the data points.
A 5th degree polynomial equation (shown in Figure 6 ) best represented the data points for system runout.
Since it was highly improbable that the wire was vertical, a linear least squares fit was performed on the data to determine the vertical tilt of the wire.
For a given vertical position, the difference between the 5th degree polynomial and lineal equations was determined to be 1735 049 the system runout as shown in Figure 7 The equation for the system runout x is shown below:
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To determine the bias and the precision of the system runout, the X values tabulated in Table 4 were compared with the X values calculated from the 5th degree polynomial equation.
Figure 8 is a frequency histogram of the difference between the actual data points and calculatad data points.
The data reddcrion of error readings for bow runout correction showed I.0067 inches at the one
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sigma level.
This bias and precision included the width and system runout error.
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TABLE 2 QUALIFICATION DATA - LENGTH MEASUREMENTS Scale Reading Encoder Reading (Inches)
(Inches) 6.0000 5.9920 8.0000 7.9935 14.0000 13.9880 22.0000 21.9810 30.0000 29.9625 37.0000 36.9580 49.0000 48.9465 59.0000 58.9470 68.0000 67.9420 73.0000 72.9360 80.0000 -
79.9270 94.0000 93.9180 101.0000 100.9065 107.0000 106.8945 111.0000 110.8888 115.0000 114.8930 119.0000 118.8825 125.0000 124.8925 130.0000 129.8890 136.0000 135.8840 140.0000 139.8670 143.0000 142.8740 95.0000 94.9060 82.0000 81.9190 72.0000 71.9450 59.0000 58.9425 48.0000
~47.9520 36.0000 35.9465 26.0000 25.9795 22.0000 21.9860 17.0000 16.9915 10.0000 9.9985 6.0000 5.9980 1.0000 1.0035 7.0000 7.0000 12.0000 12.0065 17.0000 16.9945 22.0000 21.9825 31.0000 30.9700 39.0000 38.9645 50.0000 49.9475 59.0000 58.9460 68.0000 67.9440 79.0000 78.9325 84.0000 83.9190 1735 051.-
Table 2 (continued)
Qualification Data - Length Measurements 92.0000 91.9125 107.0000 106.9100
.118.0000 117.8940 125.0000 124.3930 139.0000 138.8860 123.0000 122.8865 103.0000 102.9080 82.0000 81.9220 61.0000 60.9455 34.0000 33.9650 8.0000 7.9950 1.0000 1.0140 O
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1735 054 TA3LE 3 QUALIFICATION DATA - WICTH MEASURIMINT Scale Reading Encoder (Inches)
(Inches) 2.0000 2.0052 3.0000 2.9997 4.0000 4.0084 5.0000 5.0051 6.0000 6.0071 7.0000 7.0089 8.0000 8.0041 9.0000 9.0123 10.0000 10.0158 9.0000 9.0130 8.0000 8.0113 7.0000 7.0105 6.0000 6.0095 5.0000 5.0085 4.0000 4.0079 3.0000 3.0009 2.0000 1.9994 1.0000 1.0023 2.0000 1.9982 3.0000 3.0013 4.0000 4.0019 5.0000 5.0087 6.0000 6.0098 7.0000 7.0088 8.0000 8.0103 9.0000 9.0141 l
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TA7,LE 4 30W QUALIFICATION X
Y X
Y (Inches)
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(Inches)
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.0630 5.9610
.1220 149.5350
.0590 10.1440
.1020 140.2150
.0580 15.4210
.0510 130.2290
.0570 20.1700
.0010 120.8560
.0510 25.2480
.0440 110.8330
.0340 31.3260
.0990 100.2540
.0230 38.2940
.1230 91.0190
.0020 45.2270
.1070 80.7130
.0170 52.2840
.0720 70.6200
.0260 59.3220
.0260 60.6140
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.0570 65.8570
.0220 56.8160
.0770 71.6280
.0180 50.5550
.1050 77.4090
.0220 39.8550
.1180 84.3560
.0450 30.4770
.1260 90.4920
.0640 20.6670
.1180 96.8270
.0620 10.7020
.0900 101.5510
.0640 5.8900
.0640 107.8400
.0340 113.4120
.0200 118.8390
.0120 123.5210
.0400 128.5860
.0700 133.6460
.0960 138.6040
.1270 143.5570
.1380 148.8140 1735 058
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System Requalification Periodically, during the fuel inspection operation, the system encoders were checked to see if they were within calibration.
If the encoders were out of calibration, the equipment would have to be removed from the spent fuel pool and the encoders changed.
Two scribe marks were made on the stainless steel mirror assembly portion of the fuel inspection basket, both in the horizontal and vertical directions.
These four scribe marks were measured in air at 750F after the fuel inspection sy: stem was qualified.
The readings obtained 6.0115 inches and 12.0020 inches for the vertical direction and 5.9826 inches and 12.0189 inches for the horizontal direction were used as a reference to compare with the readings taken during the fuel inspection operation.
The results of the readings taken during the inspection are shown in Table 5.
The average difference between the actual reading taken under water and the known distances were -0.005 inches with a one sigma value of 0.0023 for the vertical encoder and +0.0005 inches with a one sigma value of 0.0013 for the horizontal encoder.
These meast.rements were well within the expected error band deter-mined during the initial system qualification.
i735 062
_22_
TABLE 5 MEASUREMENTS TAKEN OF KNOWN DISTANCES DURING THE FUEL INSPECTION Measurement No.
Reading Difference (inches)
(inches) 1 6.0100
-0.0015 12.0040
+0.0020 5.9838
+0.0012 12.0204
+0.0015 2
6.0110
-0.0005 12.0000
-0.0020 5.9834
+0.0008 12.-0174
-0.0015 3
6.0100
-0.0015 12.0050
+0.0030 5.9814
-0.0012 12.0168
-0.0021 4
6.0080
-0.0035 12.0045
+0.0025 5.9844
+0.0018 12.0204
+0.0015 5
6.0080
-0.0035 11.9995
-0.0025 5.9834
+0.0008 12.0201
+0.0012 6
6.0130
+0.0015 12.0015
-0.0005 5.9838
+0.0012 12.0195
+0.0006 h
1735 063 J
Comparison of Rod Closure Measurements q
i Six of the predetermined rod closure measurements were repeates during the course of the fuel inspection at Indian Point #2 in order to determine the operator precision for these types of measurements underwater.
Figure 9 shows the frequency histogram of the variation between these rod closure measurements.
Figures 10 through 15 show the actual comparison of the rod closure measurements.
The comparison of the data showed a f'
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standard deviation at the one sigma level of 0.0057 inches, which is within the system runout qualification precision of j,
I-i 0.0067 inches at the one sigma level.
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1735 065 RCD C L.O ELAR E REEEMf5L_Y NO E3a
. Itu FRCE 2 FRO DS (3 -B
.450 e
P ga ginal
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5 LU O
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e Ln CD FIGUlti; 10 Itod Closure of Rods 8 and 9, Ch Between Grids 7 and 8, Pace 2, Assembly E-38
Rao closure f=t s s E M E5 L Y NO D7I
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RODS i2-13
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FIGUllE 11 Rod Closure of Rods 12 and 13, N
Iletween Grids 2 and 3, Face 1, issembly D-71 L
+
4 ROD CL D ELJ R E R 55 EME5 LY FSO DI I
.inu FRCE 2 RODE E
- 7
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'd N
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id le tu IN Rf iG 111 1C Nu Ln FIGURE 12 Rod Closure of Rods 6 and 7, C
netween Grids 5 and 6, Face 2, O
Assembly D-ll CD
ROD C L.D S LJ R C FI S S Ci1f5 t_.Y NO CS
.itM3 FRCC I
RODS I i-12
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lit til LT1 CD FIGURE 13 Rod Closure of Rods 11 and 12, W
Detween Grids 2 and 3, Face 1, Aissembly C-06
ROD C L O s tJ R C R S S CI-1E5 LY I4D B '-I S
.gea FRCE I
ROps I-2
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w
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FIGuitE 14 llod Closure of Rods 1 and 2, Detween Grids 4 and 5, Face 1, o
Assembly B-49 N
O
ROD C L O S LIN E FIE E E M B L Y NO S't i
, g gg F'R C C i
Raps a2-1 I
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.070 p.cun Nu g:
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FIGUllE 16 Rod Closure of Rods 10 and 11, Detween Grids 2 and 3, Face 1, Asseinbly D-41 t
FUEL INSPECTION METHODS Visual Examination The visual examination of an individual face was carried out in two stages.
The first half of the peripheral rods were examined by starting at the lower left side of the assembly and scanning ripward at approximately 2-1/2 to 3 feet / min.
The second half of the rods were examined by starting from the upper right side of the assembly and scanning downward at the same rate.
The elapsed time to scan a complete face for visual examination wcs approximately 15 to 20 minutes.
Complete video tapes were made of the visual examination.
Figure 16 shows the face orientation for the Indian Point Unit No. 2 fuel assemblies.
W%
r Y CO.9.M.'t T.I???.l.1C5, CLT.ni?.
bgg
- OS A'o Oil Fici 3 71;I I I
h North
-1:IxiiTY.w.,
1 i<
r ::
Figure 16 Fuel Assembly Face Orientation 1735 072 Dimensional Measuratents l
Individual rod closure measurements were made by first align-ing the right hand edge of the left rod with the left edge of the cross hair on the television monitor and recording the axial and vertical position.
After the reading is taken, the camera is then moved until the left hand edge of the right rod is aligned with the left edge of the cross hair on the television monitor.
The axial and vertical position of the right red is then recorded.
This procedure at inter-mediate locations in the grid span was repeated.
A minimum of six rod closure measurements were taken per grid slot.
These encoder readings, using a calculator program, were then converted to inches and the axial delta between the two readings was determined.
These axial delta values were then plotted versus their vertical location and compared to a design value of 0.141 inches.
Rod length measurements were made by aligning the bottom and top of the selected rods with the horizontal cross hair on the monitor and recording the encoder readings.
The encoder readings were converted to inches and the difference between the two corrected values was the actual rod length.
In order to look at assembly length, guide thimble length measurements were made by recording the encoder position of the upper edge of the lower nozzle at the mid-point of Rod 8 and then the position of the lower edge of 1735 073 the upper no::le above the mid-point of Rod 8.
The corrected
~
difference of the two readings was determined to be the guide thimble length.
Assembly bcw measurements were performed on one face of the specified assemblies.
Bow measurements were made at the edge of the selected face.
These readings actually describe the bow of the face at 90 to the face being observed.
The measurements involved first aligning the right hand side of the monitor crosshair with the left hand center edge of the individual grids and then recording the position location.
The locations were then converted to inches and the appro-priate system runout for the particular vertical position added to the horizontal reading.
The displacement of each grid or bow was then determined by correcting for tilt.
This was done by assuming grids 1 and 9 were fixed points of the assembly, and determining the slope between them.
0 Twist measurements were made by rotating the assembly at 45 to orientate the pl,ane of the corner of the upper and lower no::les to be perpendicular with respect to the camera axis.
The location of the no::le corners was then determined.
These encoders readings, using a calculator program, were corrected for runaut.
By assuming the distance berween the corners of the upper and lower no::les in the axial direction is a chord of a circle with a radius of 5.9581 inches (the radius of the fuel assembly), one can ecmpute the angle of 1735 074 the are formed by the chord.
/
RESULTS Visual Examination The peripheral rods examined in the eight 15 X 15 Indian Point No. 2 HIPAR fuel assemblies, appeared to be in excellent y
condition with light to medium patchy oxide covering the active fuel cladding surfaces.
The crud level on the peripheral rods' surfaces appeared to be low; however, slight crud spalling was noticed on some of the rods.
As a result of the rubbing action between adjacent assemblies during shuffle, many grid straps were shining, and sone had shallow scratches.
Also observed were a few slightly dented grid corners with insignificant amount of protrusion.
Two assemblies showed a few rods that were either touching or al-most touching both the upper and the lower nozzles.
In particular, the rod 9 on face 1 of assembly B-41 was touching both the upper and the lower nozzles, and was bowed in both directions, alternately touching or almost touching rods 8 and 10 between every grid.
Also in this assembly, rod 7 on face 3 was interference bowed in the same manner.
It should be noted that Regions B and C fuel rods with relatively longer as built rod length had lesser free room to grow than Regions D and E fuel rods (see Rod Length section for dimensions).
In another observation, a partial fret was seen at the lower end plug region of rod 1 on face 3 in assembly D-ll.
This anamoly not considered significant.
Complete video tapes were made of the visual examination of these 8 fuel assemblies.
Table 6 is an index of the video tapes used at Indian Point No. 2 during the examination 1735 075 of the irradiated fuel assemblies.
TABLE 6 TAPE CATALOG OF THE IIGHT FUEL ASSEMBLIES VISUALLY INSPECTED AT INDIAN POINT NO. 2 AT THE END OF CYCLE 3 Tape Catalog of B-41 Description Start Finish Scan Face I.L 000 141 Scan Face _R 141 242 Scan Face 2L 242 348 Scan Face 2R 348 411 Scan Face 3L 411 502 Scan Face 3R 502 557 Lower Nozzle 557 560 Scan Face 4L 560 635 Scan Face 4R 635 683 Tape Catalog of B-49 Description Start Finish Scan Face IL 000 148 Scan Face 1R 148 230 Scan Face 2L 230 341 Scan Face 2R 341 414 Scan Face 3L 414 507 Scan Face 3R 507 564 Lower Nozzle 564 568 Scan Face 4L 568 643 Scan Face 4R 643 704 Tape Catalog of C-06 Description Start Finish Scan Face IL 000 100 Scan Face 1R 100 23 1 Scan Face 2L 231 341 Scan Face 2R 341 406 Scan Face 3L 406 480 Scan Face 3R 480 565 Bottom Grid - Rods 3-4 565 576 Scan Face 4L 576 656 Scan Face 4R 656 704 Rod 1, Top of 1st grid 704 708 Lower No::le 708 715
~
1735 076
_3,_
TABLE 6 (Continued)
Tape of Catalog of D-ll Description, Start Finish Scan Face IL 000 157 Scan Face LR 157 234 Scan Face 2R 234 342 Scan Face 2L 342 405 Scan Face 3R 405 497 Scan Face 3L 497 551 Scan Face 3, Rod 1 551 555 Scan Face 4L 555 634 Scan Face 4R 634 682 Tape Catalog of D-71 Description Start Finish Scan For Face IL Missing 000 158 Scan Face 1R 158 243 Scan Face 2L 243 352 Scan Face 2R 352 419 Scan Face 3L 419 510 Scan Face 3R 510 565 Lower Nozzle 565 570 Scan Face 4L 570 649 Scan Face 4R 649 695 Tape of Catalog of E-38 Description Start Finish Scan of Face IL 000 196 Scan of Face 1R 196 298 Scan of Face 2L 298 430 Scan of Face 2R
.430 508 Lower Nozzle 509.
516 Scan of Face 3L 516 603 Scan of Face 3R 603 681 Scan of Face 4L 681 763 Scan of Face 4R 763 809 1735 077 TABLE 6 (Continued)
Tape Catalog of E-49 Description Start Finish Scan of Face IL (incomplete) 000 013 Scan of Face 2L 018 160 Scan of Face 2R 160 236 Scan of Face IL 236 340 Scan of Face la 340 406 Scan of Face 4L 406 500 Scan of Face 4 -
500 506 Upper Nozzle Scan of Face 4R 506 561 Scan of Face 3L 561 644 Scan of Face 3R 644 694 Tape Catalog of C-23 Description Start Finish Scan Face IL 000 159 Scan Face 1R 159 237 Scan Face 2L 237 347 Scan Face 2R 347 416 Scan Face 3L 416 506 Scan Face 3R 506 571 Lower Nozzle 571 581 Scan Face 4L 581 659 Scan Face 4R 659 708 1735 078 M
a Rod Closure Fuel rod closure measurements were performed on the seven fuel assemblies at 172 randomly chosen locations.
The location of individual rod closure measurements was predetermined using a random number generator program.
Rod closure data are contained in Table 10.
Based on burnup, the measurements can be grouped into three populations (burn-up of approximately 13,000, 25,000, and 36,500 MUD /MTU) and the average rod closures are 0.1211, 0.1208, and 0.1160 inches, respectively, with standard deviations at the one sigma level of 0.0077, 0.0123, and 0.0143 inches.
As previously noted, rod closure is defined as the minimum projected spacing or gap between two adjacent fuel rods and two successive grids (corresponding in the unbowed case to 0.141 inches).
TABLE 7a ROD CLOSURE MEASUREMENT OCCURRENCE (Burnup 1 3 6,5 00 *:Wp/MTU)
Rod Closure No. of Occurrences
% of Total
> One Sigma 12 12.4
> Two Sigma 4
4.1
> Three Sigma 3
3.1
, p e. A
- A
- 36,500 for "B" and "C",
25,000 for "D"
and 13,000 for "E"
assemblies.
TABLE 7b ROD CLOSURE MEASUREMENT OCCURRENCE (Burnup 1 25,000 MWD /MTU)
Rod Closure No. of Occurrences
% of Total
> One Sigma 7
14.6
> Two Sigma 1
2.1
> Three Sigma 0
0 TABLE 7c ROD CLOSURE MEASUREMENT OCCURRENCE' (Burnup 1 13,000 MWD /MTU)
Rod Closure No. of Occurrences
% of Total
> One Sigma 3
11.1
> Two Sigma 1
3.7
> Three Sigma 1
3.7 The maximum rod closure measured (Assembly B-41 between grids 2 and 3) was 0.0668 inches (versus nominal of 0.141), which corresponds to a 52% rod to rod closure.
The individual rod closure data was compared to axial loca-tion.
The histograms for the individual grid locations (spans) are shown in Figure 17 through 25c and summarized in Tables 8 and 9.
Figures 26 through 29 show rod closure vs. burnup com-parison in histogram form.
TABLE 8 ROD CLOSURE VERSUS GP.ID LOCATION (ALL' Crid Location Average Rod Closure No. of Measuremen s 1-2 0.1201 21 2-3 0.1212 21 3-4 0.1187 16 4-5 0.1181 24 5-6 0.1146 16 6-7 0.1206 29 7-8 0.1180 21 8-9 0.1152 24 TABLE 9a ROD CLOSURE VERSUS GRID LOCATION (Burnup i 36,500 MWD /MTU)
Grid Span Rod Closure (in.)
Sample Location No.
Length (in)
Average Maximum 1 Sigma Size 1-2 1
15.54 0.1189 0.0935 0.0134 11 2-3 2
18.50 0.1215 0.0668 0.0184 15 3-4 3
18.50 0.1150 0.0829 0.0135 9
4-5 4
16.88 0.1163 0.0993 0.0110 13 5-6 5
16.87 0.1103 0.1004 0.0107 8
6-7 6
19.50 0.1141 0.0958 0.0127 14 7-8 7
20.75 0.1141 0.0693 0.0161 14 8-9 8
16.82 0.1149 0.0699 0.0158 13 All 0.1160 0.0668 0.0143 97 1735 081
_,1_
o TABLE ',o ROD CLOSURE VERSUS GRID LOCATION (Burnup 1 25,000 MWD /MTU)
Grid Span Rod Closure (in.'
Sample Location No.
Length (in.)
Average Maximum 1 Sigma Size 1-2 1
15.54 0.1269 0.1171 0.0083 6
2-3 2
18.50 0.1235 0.1232 0.0004 2
2-3 3
18.50 0.1233 0.1075 0.0091 6
3-4 4
16.88 0.1151 0.0978 0.0099 8
4-5 5
16.87 0.1174 0.0959 0.0169 9
5-6 6
19.50 0.1288 0.1100 0.0104 7
6-7 7
20.75 0.1245 0.1117 0.0145 4
7-8 8
16.82 0.1120 0.0932 0.0142 6
All 0.1208 0.0932 0.0128 48 TABLE 9c ROD CLOSURE VERSUS GRID LOCATION (Burnup i 13,000 MWD /MTU)
Grid Span Rod Closure (in.)
Sample Location No.
Length (in.)
Average Maximum 1 Sigma Size 1-2 1
15.54 0.1133 0.0976 0.0111 4
2-3 2
18.50 0.1192 0.1109 0.0081 4
3-4 3
18.50 0.1247 1
4-5 4
16.88 0.1221 0.1177 0.0066 3
5-6 5
16.87 0
6-7 6
19.50 0.1230 0.1184 0.0040 8
7-8 7
20.75 0.1276 0.1203 0.0066 3
8-9 8
16.82 0.1206 0.1081 0.0094 4
All 0.1211 0.0976 0.0077 27 1735 082
TA3LE 10 INDIAN POINT #2 FUEL INSPECTION ROD CLOSURE SUIO1ARY ASSEMBLY FACE RODS GRIDS MAX. CLOSURE B-41 1
10-11 2-3
.1218 B-41 1
3-4 3-4
.1192 B-41 1
14-15 3-4
.0829 B-41 1
9-10 6-7
.0958 B-41 1
4-5 8-9
.1089 B-41 2
2-3 1-2
.12,17 B-41 2
4-5 1-2
.1189 B-41 2
11-12 1-2
.1203 B-41 2
10-11 4-5
.1129 B-41 2
10-11 6-7
.1058 B-41 3
6-7 6-7
.1223 B-41 3
7-8 6-7
.1238 B-41 3
13-14 6-7
.1178 B-41 3
3-4 7-8
.1276 B-41 3
9-10 7-8
.0693 3-41 3
2-3 8-9
.1245 B-41 3
9-10 2-3
.0668 B-41 3
8-9 4-5
.1019 B-41 3
9-10 5-6
.1273 3-41 3
11-12 8-9
.1231 3-41 3
14-15 8-9
.0699 B-41 4
5-6 1-2
.1213 3-41 4
9-10 1-2
.1023 B-41 4
7-8 2-3
.1373 B-41 4
6-7 3-4
.1262 B-41 4
4-5 4-5
.0993 3-41 4
7-8 4-5
.1308 B-41 4
13-14 6-7
.0979 B-41 4
11-12 7-8
.1118 B-49 1
7-8 2-3
.1440 3-49 1
6-7 3-4
.1157 B-49 1
9-10 3-4
.1079 B-49 I
l-2 4-5
.1087 B-49 1
2-3 4-5
.1229 B-49 1
4-5 4-5
.1229 B-49 1
14-15 6-7
.0974 3-49 1
10-11 7-8
.1111 3-49 2
6-7 4-5
.1024 3-49 2
7-8 7-8
.1204 B-49 2
13-14 7-8
.1162 B-49 3
3-4 2-3
.1249 B-49 3
11-12 2-3
.1195 B-49 3
3-4 6-7
.1025 B-49 3
7-8 7-8
.1378 B-49 4
5-6 4-5
.1272 B-49 4
6-7 5-6
.1004 B-49 4
5-6 6-7
.1245 3-49 4
3-4 8-9
.1284 B-49 4
9-10 7-8
.1195 1735 083 TABLE 10 (Cont.inued)
INDIAN POINT #2 FUEL INSPECTION ROD CLOSURE
SUMMARY
ASSE31BLY FACE RODS GRIDS MAX. CLOSURE C-06 1
11-12 1-2
.1245 C-0.6 1
11-12 2-3
.1099 C-06 1
9-10 4-5
.1150 C-06 1
14-15 5-6
.1010 C-06 1
12-13 6-7
.1142 C-06 1
3-4 7-8
.1029 C-06 1
13-14 8-9
.1061 C-06 2
3-4 1-2
.1355 C-06 2
8-9 l-2
.1070 C-06 2
9-10 2-3
.1315 C-06 2
8-9 3-4
.1222 C-06 2
9-10 6-7
.1226 C-06 2
1-2 8-9
.1099 C-06 2
4-5 8-9
.1202 C-06 2
5-6 8-9
.1172 C-06 3
13-14 5-6
.1221 C-06 3
14-15 7-8
.1124 C-06 3
3-4 8-9
.1245 C-06 4
5-6 2-3
.1045 C-06 4
11-12 2-3
.1271 C-06 4
5-6 3-4
.1208 C-06 4
8-9 3-4
.1127 C-06 4
10-11 5-6
.1051 C-06 4
11-12 5-6
.1005
~C-06 4
9-10 8-9
.1069 C-23 1
9-10 2-3
.1282 C-23 1
14-15 4-3
.1276 C-23 1
11-12 6-7
.1304 C-23 1
10-11 7-8
.1165 C-23 2
12-13 1-2
.1242 C-23 2
9-10 2-3
.1294 C-23 2
11-12 2-3
.1120 C-23 2
6-7 6-7
.1090 C-23 2
4-5 7-8
.1313 C-23 2
3-4 8-9
.1284 2
9-10 8-9
.1262 C-23 ~
3 2-3 1-2
.0935 C-23 C-23 3
6-7 1-2
.1388 C-23 3
12-13 4-5
.1275 C-23 3
13-14 7-8
.1168 C-23 3
1-2 7-8
.1039 C-23 e
1-2 2-3
.1328 C-23 4
3-4 2-3
.1323 C-23 4
12-13 3-4
.1270 C-23 4
14-15 4-5
.1132 C-23 4
6-7 5-6L
.1076 C-23 4
10-11 5-6
.1183 C-23 4
14-15 6-7
.1331 1735 084
_u_
TABLE 10 (Continued)
INDIAN POINT #2 FUEL INSPECTION ROD CLOSURE
SUMMARY
ASSEMBLY FACE RODS GRIDS FAX. CLOSURE D-ll 1
3-4 6-7
.1218 D-11 1
2-3 7-8
.1254 D-ll 2
13-14 1-2
.1314 D-ll 2
6-7 5-6
.0959 D-ll 2
10-11 6-7
.1394 D-ll 2
4-5 8-9
.1138 D-ll 3
3-4 3-4
.1270 D-ll 3
8-9 3-4
.1282 D-ll 3
9-10 4-5
.1198 D-ll 3
7-8 5-6
.1302 D-ll 3
12-13 6-7
.1370 D-11 3
7-8 7-8
.1446 D-ll 4
9-10 2-3
.1238 D-ll 4
7-8 3-4
.1334 D-11 4
9-10 4-5
.1154 D-ll 4
1-2 5-6
.1358 D-11 4
2-3 5-6
.1286 D-11 4
9-10 5-6
.1386 D-ll 4
3-4 6-7
.1326 D-11 4
14-15 6-7
.1350 D-ll 4
9-10 8-9
.1346 D-71 1
4-5 1-2
.1363 D-71 1
9-10 1-2.
.1340 D-71 1
12-13 2-3
.1232 D-71 1
10-11 4-5
.1216 D-71 1
13-14 4-5
.1029 D-71 1
1-2 5-6
.1091 D-71 1
7-8 5-6
.0963 D-71 1
10-11 5-6
.1202 D-71 1
7-8 6-7
.1257 D-71 1
8-9 8-9
.1089 D-71 2
5-6 1-2
.1248 D-71 2
12-13 1-2
.1175 D-71 2
1-2 3-4
.1075 D-71 2
4-5 4-5
.1175 D-71 2
13-14 5-6
.1021 D-71 2
12-13 8-9
.1027 D-71 3
1-2 3-4
.1252 D-71 3
12-13 3-4
.1185 D-71 3
1-2 7-S
.1164 D-71 3
14-15 8-9
.1186 D-71 4
3-4 1-2
.1171 D-71 4
4-5 4-5
.1177 D-71 4
5-6 4-5
.1280 D-71 4
6-7 4-5
.0978 D-71 4
8-9 6-7
.1100 D-71 4
14-15 7-8
.1117 D-71 4
7-8 8-9
.0932 1735 085 TABLE 10 (Continued)
INDIAN POINT #2 FUEL INSPECTION ROD CLOSURE SUMM7J.Y ASSEMBLY FACE RODS GRIDS MAX. CLOSURE E-38 1
11-12 6-7
.1309 E-38 1
12-13 7-8
.1292 E-38 1
9-10 8-9
.1265 E-38 2
8-9 l-2
.1168 E-38 2
11-12 1-2
.0976 E-38 2
7-8 2-3
.1135 E-38 2
4-5 6-7
.1184 E-38 2
5-6 6-7
.1207 E-38 2
10-11 6-7
.1248 E-38 2
8-9 7-8
.1332 E-38 2
1-2 1-2
.1151 E-38 2
2-3 2-3
.1265 E-38 3
5-6 2-3
.1257 E-38 3
12-13 2-3
.1109 E-38 3
9-10 3-4
.1247 E-38 3
13-14 4-5
.1188 E-38 3
4-5 4-5
.1297 E-38 3
4-5 6-7
.1247 E-38 3
1-2 6-7
.1230 E-38 3
12-13 6-7
.1226 E-38 3
11-12 7-8
.1203 E-38 3
13-14 8-9
.1290 E-38 4
12-13 8-9
.1188 E-38 4
2-3 8-9
.1081
- I-38 4
10-11 6-7
.1190 E-38 4
10-11 4-5
.1177 E-38 4
7-8 1-2
.1236 1735 086
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N rr ta la El F.
u LT1 Ilod Closure (Iniches)
CD 00 FIGullE 17 IIISTOGilAM OF TIIE ltOD CLOSUllE MEASUllED AT N
INDIAN POINT 82 AT TIIE END OP CYCLE 3
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FIGURE 18h IIISTOGRAM OF Tile ROD CLOSURE MEASURED w
WITIIIN GRID SPAN 1 (25,000 MWD /MTil)
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II FIGURE 20a IIISTOGRN4 OF Ti1E ROD CLOSURE MEASURED
~
WITJIIN GRID SPAN 3 (36,500 MWD /MTU)
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LT1 FIGURE 20b IIISTOGRAM OF TIIE ROD CI.OSURE MEASURED WITilIN GRID SPAN 3 (25,000 MWD /MTU)
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CD FIGURE 21b IIISTOGRAM OF TIIE ROD CLOSURE MEASURED CD WITilIN GRID SPAN 4 (25,000 MWD /MTU)
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O FIGURE 22a IIISTOGRAM OF Tile ROD CLOSURE MEASURED WITIIIN GRID SPAN 5 (36,500 MWD /MTU)
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FIGURE 23a IIISTOGRAM OF TIIE ROD CLOSURE MEASURED WITIIIN GRID SPAN 6 (36,500 MWD /MTU)
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FIGUltE 24a IIISTOGRAM OF Tile ROD CLOSURE MEASURED WITIIIN GRID SPAN 7 (36,500 MWD /MTU) w
e
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CD FIGURE 24b IIISTOGRAM OF TIIE ROD CLOSURE MEASURED O
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a CD FIGURE 24c IIISTOGRAM OF TIIE ROD CI,OSURE MEASUllED N
WITIIIN GRID SPAN 7 (13,000 MWD /MTU)
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( T1 FIGURE 25b IIISTOGRAM OF Tile ROD CLOSURE MEASURED WITIIIN GRID SPAN 8 (25,000 MWD /MTU)
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IJ LT1 FIGURE 25c IIISTOGRAM OF Tile ROD CLOSURE MEASURED WITilIN GRID SPA 11 0 (13,000 MWD /MTU) ca
~
IlURNUP 36000
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FIGURE 26 File 00ENCY IIISTOGRAft OF ROD CLOSUltE MEASUREt1ENTS FOR Tile B ASSEf1BLIES
BURt10P 37000 X =. I i171 G
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M FIGURE 27 FREQUENCY llISTOGRAll OF ROD CLOSURE MEASUREMENTS FOR C ASSEMDLIES
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LD FIGURE 28 FREQUENCY IIISTOGRAM OF ROD CLOSURE MEASI1EMENTS FOR D ASSEMBLIES C>
/
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/
,J.
3 Rod Length (Uncorrected for Temperature) t-t
~l Rod lengths were taken on each assembly face at specified locations.
By predetermining which four rods were to be measured, the results should be interpreted as typical and not biased.
The rod lengths measured for the seven assem-blies are summarized in Table ll and shown in Table 13.
.J TABLE 11 P
ROD LENGTH STATISTICAL RESULTS j
(Uncorrected for Temperature)
Assembly (inches)
'l Item B
C D
E D* & E X Max.
150.6078 150.4533 149.5699 149.5149 149.5149 X Min.
149.9967 149.5012 148.9369 148.9434 148.9021 q
Range
.6111
.9521
.6330
.5715
.6128 i
Mean 150.2978 150.1614 149.2556 149.1433 149.1206 Variance
. 0128
.0568
.0253
.0363
.0264
~
i I Z Skewness
.2255
-1.5334
.-0.2337
.7451
.8727
,m Kurtosis 141.5806 6.1971 62.3799
-2.7051
-31.1183 1
N 32 32 32 16 eP The mean rod length for the "B" assemblies was 150.2978 inches.
j This indicated an average rod growth for "B" assemblies during the first 3 Cycles of 0.928 inches (Cycles 1 and 2 growth, i~
0.682 inches and Cycle 3 growth of 0.246 inches) as compared 1735 116 3
t
~~
Results from 1978 examination after first cycle burnup. See
' discussion on page 77.
w.' + ' an initial rod length of 14 9. 37 0 t 0. 035 inches.
Figure 30 is a frequency histogram of the measured rod lengths of the "B" as.=emblies and shows the standard deviation at the one sigma level to be 0.1146 inches.
The mean rod length for the "C" assemblies was 150.1614 inches, which indicated an average rod growth during the first three cycles of 0.791 inches (Cycles 1 and 2 growth, 0.621 inches, Cycle 3 growth, 0.170 inches) as compared with the initial rod length of 14 9. 37 0 t 0. 035 inches.
Figure 31 is a frequency histrogram of the measured rod lengths of the "C" assemblies and shows-the deviation at one sigma level to be 0.2383 inches.
The mean rod length for the "D" assemblies (Figure 32) was 149.2556 inches, which indicated an average rod growth during its first two cycles of exposure of 0.665 inches (Cycle one growth, 0.518 inches) as compared with the initial fuel rod length of 148.591 inches.
The mean rod length for the "E" assembly (Figure 33) is 149.1433, which indicated a growth during the first cycle of 0.497 inches as compared to an initial length of 148.646 inches.
Additionally, in order to increase the E assembly sample size, values measured on "D" assemblies during the 1978 inspection (at similar burnup 13000 MWD /MTU) were combined and analyzed with the measured values for the "E" assemblies.
the mean rod len: - for this sample was 149.1206 inches with one sigma deviation of 0.1625 (Figure 34 ).
1735 117 The statistics and precision indices presented in Table 11 are general and apply to any type of frequency distribution.
The third and fourth moments about the mean, skewness, and kurtosis, are presented mainly for completeness.
Their values are very sensitive to the number of measurements (n) and unless n is large, the values are unreliable because of their high sensitivity to fluctuations in the tail regions of the distribution.
With the exception of the measurements 2
of the C assemblies, a chi square test (X 1 at the 95% con-3;,
fidence level indicated that the sets of measurements were normally distributed.
However, if the 4 low measurements on t'
race 2 of C-06 are discounted, this set also appears to have
- r, I
a normal distribution.
La i
6,.
l To correct for temperature differential between the system qualification and the time of inspection, one has to con-
~ ~
sider both the temperature expansion of stainless steel and circa'loy-4.
The following formula can be used to correct I
for temperature:
l t
AL -
S
~
~
(15.8 X 10 AT)* - (-2.506 X 10 AT + 2.22 X 10 (T
-To )**
t L
f L
o i-As shown in the above formula, to determine the rod length at 75 F, the correction factor for stain]ess steel encoder racks Coefficient of thermal expansion for 304 Stainless Steel U
per C.
Coefficient of thermal expansion for Zircaloy
-4 per C,
per p.
179, TREE-NUREG-1005, MATPRO-VERSION 09,.i Handbcok of Material Properties for Use in the Analysis o" 4;ps:
g Water Reactor Ecc schavior.
I/JJ would be added and the correction factor for zircaloy rod expansion would be subtracted from the rod lengths taken at elevated temperatures.
Table 12 lists the temperature correction zirculoy that should be applied to the individual rod length measurements.
TABLE 12 TEMPERATURE CORRECTION FOR ROD LENGTH MEASUREMENTS Assembly Mesurement Correction Number Temperature, OF Inches B-41 93
-0.131 B-49 95
-0.150 C-23 95
-0.150 C-06 95
-0.150 D-ll 95
-0.149 D-17 95
-0.149 E-38 97.5
-0.173 1735 11o
TABLE -o
~
ROD LENGTH
SUMMARY
(Uncorrected for Temperature) l Assembly Rod Number No.
Face 1 Face 2 Face 3 Face 4 j
6 3-41 3
150.6078 150.2221 150.2151 150.3006 3-49 150.2496 150.2356 150.2856 150.3962 C-06 150.1840 149.6111 149.7546 150.1415 C-23 150.2971 150.2766 150.2941 150.2346 D-ll 149.4129 149.5699 149.3368 149.4028 D-71 149.2442 148.9624 148.9815 149.2372 E-38 149.0816 148.9434 148.9579 149.3548 3-41 8
149.9967 150.2081 150.1996 150.2401 3-49 150.3222 150.4097 150.2471 150.4283 C-06 150.1916 149.7586 150.1435 150.1981 l
C-23 150.4002 150.3377 150.2696 150.2131 D-11 149.4023 149.1934 149.2957 149.3748 D-71 149.2507 149.1406 149.0565 149.3208 E-38 149.0725 149.3428 149.0605 149.3968 l
3-41 10 150.3292 150.2766 150.3722 150.2196 3-49 150.4453 150.4423 150.2376 150.1991 l
C-06 150.2436 149.6553 150.1445 150.1835 C-23 150.2771 150.3337 150.2396 150.2211 D-11 149.4103 148.9369 149.2937 149.3863 D-71 149.2412 149.3203 149.0130 149.1791 l
E-38 149.0986 148.9760 148.9880 149.4073 3-41 15 150.4268 150.3667 150.2466 150.1986 3-49 150.3087 150.1951 150.4193 150.2806 C-06 150.2891 149.5012 150.1325 150.1210 C-23 150.3667 150.4533 150.3312 150.3657 D-11 149.4199 149.5100 149.3518 149.3278 D-71 149.1576 149.0690 149.1731 149.2072 E-38 149.0165 149.0956 148.9859 149.5149 1735 120 lEO.2970 X
a I 133 5
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FIGURE 30 ROD LENGTII OF "B" ASSEMBLIES
7 E3h*E31 0
-R 0
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w
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KG
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g.g g ADUBnDB23 1735 125 S
Assembly Bow Table 14 is a summary of the assembly bow of individual assem-blies measured.
Figures 35 through 41 show the assembly bow of the individual faces measured.
Assembly D-71 appeared to have the most significant bow on the face measured,.185 inches.
No problems were encountered during the handling of assembly D-71 and subsequent placement of this assembly in to its designated spent fuel storage rack location.
This bow measurement would be typical of the bowing seen when the assembly is free standing, i.e.,
in storage racks or in reactor core.
During the movement of the assembly, the assembly is no longer free standing and, because of its elasticity, would have a tendency to straighten itself out and reduce the actual bow of the assembly.
TABLE 14 MAXIMUM ASSEMBLY BOW Inches B-41
.118 B-49
.042 C-06
.163 C-23
.129*
D-ll
.148 D-71
.185 E-38
.079 0.64 inches in positive direction and 0.65 inches in negative direction.
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FIGURE 41 ASSEMBLY DOW OF FACE 1, ASSEMBLY E-30
's Guide Thimbles Length Guide thimble length measurements were made on each face 4of the seven fuel assemblies inspected.
The measured values are shown in Table 16 and summarized in Table 15.
TABLE 15 AVERAGE GUIDE THIMBLE LENGTHS MEASURED FOR THE 7 FUEL ASSEMBLIES EXAMINED (Uncorrected for Temperature)
Measured Assy. Type Guide Thimble Length Standard Deviation Design Value (Inches)
(One Sigma)
(Inches)
B 150.499 10.056 150.417 C
150.557 10.092 150.417 D
150.558 10.117 150.577 E
150.858 10.086 150.577 U' sing the existing system, it was impossible to measure the actual assembly length because both the upper and the lower nozzle are partially covered from the view of th,e te,l_evision camera system.
Because of the inability to measure actual assembly length, the distance between the two nozzles known as the guide thimble length was used.
Thus, the actual assembly length for these assemblies would be measured guide thimble length, plus the known lengths of the upper and lower nozzles.
Since the guide thimbles and encoder racks are both stainless steel, no temperature correction was applied or is necessary.
- Combined upper and lower nozzle fabrication lengths are 9.683" for the B and C assemblies, and 9.518" for the D and E assemblies. })k r
~ TABLE 16 GUIDE THIMBLE LENGTH (Uncorrected for Temperature) Assembly No. Face Readings (Inches) B-41 1 150.5774 B-41 2 150.5389 B-41 3 150.4633 B-41 4 150.4052 B-49 1 150.5304 3-49 2 150.5304 B-49 3 150.4963 B-49 4 150.4538 ~ C-06 1 150.5544 C-06 2 150.4896 C-06 3 150.4978 C-06 4 150.4163 C-23 1 150.6588 C-23 2 150.6958 C-23 3 150.5462 C-23 4 150.5947 D 1 150.6324 D-11 2 150.5026 D-11 3 150.9670 D-ll 4 150.5359 D-71 1 150.4658 D-71 2 150.4603 D-71 3 150.4618 D-71 4 150.4353 E-38 1 150.9585 E-38 2 150.8695 E-38 3 150.7478 E-38 4 ' 150.8565 w 1735 135 Assembly Twist Seven assembly twist measurements (one per assembly) were made during the examination. Table 17 summarizes these measurements and Table 18 shows the raw data. The maximum twist measured o was 5.11. TABLE 17 INDIAN POINT #2 FUEL ASSEMBLY TWIST Assembly No. Degrees Twist B-41 5.11 B-49
- 2. 0 5.~
C-06 2.17 C-23 1.83 D-ll 1.67 D-71 1.56 E-38 2.46 1735 136 _36_
TABLE 18 ASSEMBLY "'NIST 7..W O.CA C .'-3. 0. I R *
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