ML20141A881
| ML20141A881 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 05/12/1997 |
| From: | Gambhir S OMAHA PUBLIC POWER DISTRICT |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LIC-97-082, LIC-97-82, NUDOCS 9705150036 | |
| Download: ML20141A881 (19) | |
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Omaha Public PowerDistrict 444 South 16th StreetMan Omaha NE68102-2247 May 12, 1997 l
LIC-97-082 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-137 Washington, DC 20555
Reference:
Docket No. 50-285
SUBJECT:
Fort Calhoun Station (FCS) Steam Generator Eddy Current Test Report - 1996 Refueling Outage Attached is the FCS Steam Generator Eddy Current Test Report which summarizes testing performed during the Fall 1996 Refueling Outage. This submittal fulfills the reporting requirements of FCS Technical Specification 3.17(5)(11).
Please contact me if you have any questions.
Sincerely,
/
S.'K Gambhir Division Manager
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Engineering & Operations Support SKG/mcc
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Winston & Strawn (w/o Attachment)
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E. W. Merschoff. NRC Regional Administrator. Region IV 0'
L. R. Wharton, NRC Project Manager W, C. Walker, NRC Senior Resident Inspector i
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Page 1 FORT CALHOUN STATION STEAM GENERATOR EDDY CURRENT TEST REPORT 1996 REFUELING OUTAGE t
INTRODUCTION This report summarizes steam generator eddy current results obtained during the Fort Calhoun Station (FCS) 1996 Refueling Outage.
Omaha Public Power District (OPPD) i submitted surmiaries of results of the two previous eddy current inspections to the NRC in the following documents:
Fort Calhoun Station Steam Generator Eddy Current Test Report - 1993 Refueling Outage, dated March 18. 1994 (LIC-94-0056)
Fort Calhoun Station Steam Generator Eddy Current Test Report - 1995 Refueling Outage, dated July 18, 1995 (LIC-95-0138)
EXECUTIVE
SUMMARY
A thorough inspection was performed on 100% of the tubes in the FCS Steam Generators during the 1996 Refueling Outage.
Eddy current techniques included bobbin coil and various rotating pancake coil (RPC) technologies to further investigate bobbin indications and other suspect regions.
OPPD originally intended that all bobbin indications would be characterized utilizing diagnostic techniques, such as RPC. which are qualified in accordance with Appendix H of the EPRI PWR Steam Generator Examination Guidelines. This was the case for approximately 1200 bobbin indications. After the 1996 Refueling Outage, however, OPPD determined that 9 indications affecting 6 tubes had been sized with the bobbin probe without additional diagnostic testing. OPPD has evaluated the potential consequences and has determined that this condition does not cause any violation of FCS Technical Specifications, that there will be no adverse impact from a leakage or structural integrity standpoint, and that the steam generators are considered operable until the next scheduled eddy current inspection.
The 1996 inspection revealed that a small number of axial cracks exist in freespan sections as well as just above the top of the hot leg tubesheets in the FCS steam generators, Circumferentially oriented volumetric indications were also detected at the top of the cold leg tubesheet in steam generator RC-2A. Additionally, a number of volumetric ~ indications were dispositioned as being pluggable based on historical review of 1984 and 1985 eddy current data which indicated some change in the eddy current signal and, therefore. potential growth of the indication. No circumferential cracking was detected during any of the inspections. In-51tu pressure testing was performed on
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LIC-97-082 Attachment Page 2 S tubes with various types of indications; no leakage occurred' at pressures at or slightly exceeding three times normal operating differential pressure. Historical data review revealed that the axial cracking detected is either dormant or very slowly progressing. A total of 36 tubes were plugged in Steam Generator RC-2A and 21 tubes were plugged in RC-28. All circumferentially oriented indications were stabilized as well.
Based on the exams performed and plugging of suspect tubes. the FCS Steam Generators are considered operable until the next scheduled eddy current inspection during the 1998 Refueling Outage.
SCOPE OF EXAMINATION ABB/ Combustion Engineering conducted an inservice eddy current examination of the steam generator tubes at FCS in October and November 1996.
The examination program was conducted to meet the requirements of FCS Technical Specification Section 3.17.
The test program included:
j 1.
Full length bobbin coil testing of 100% of the tubes in Steam Generators RC-2A and RC-28. This 100% testing encompassed 4949 tubes in RC-2A and 4950 tubes in RC-2B.
2.
Rotating Pancake Coil (RPC) testing of the top of the hot leg tubesheet of 100%
of the tubes in Steam Generators RC-2A and RC-2B.
3.
RPC te:: ting in the tight radius U-bends of 48 tubes in each steam generator (20%
of the tubes in Rows 1 through 4).
4.
RPC testing of a minimum of 20% of the known dents at the lowest tube support on the hot leg side (Hl) which were previously measured at greater than 5 volts and a minimum of 20% of the dents at H1 which were previously measured at less than 5 volts.
5.
RPC testing in excess of 20% of the dents on the hot leg side of each Steam Generator which were previously measured as having radial reduction greater than or equal to 10 mils.
6.
RPC testing of 50 tubes in each Steam Generator in areas predicted to have potentially high impurity deposition using thermal hydraulic modeling.
p.h LIC-97-082 Attachment.
Page 3 7.
Bounding pattern RPC programs to bound five axial indications radially by a minimum of 5 tubes. This scope expansion added full length RPC exams on the hot leg side from the square bend to the top of tubesheet of 121 tubes in RC-2A and 103 tubes in RC-2B. It also added tube support intersection testing of all hot leg side supports below the diagonal supports of 60 tubes in RC-2A.
8.
RPC exams of 1000 cold leg expansion transitions in RC-2A and 25 cold leg expansion transitions in RC-2B to bound circumferential volumetric indications found in the RC-2A cold leg.
9.
RPC exams to characterize approximately 1200 indications detected with the bobbin probe.
B0BBIN C0ll EXAMINATIONS AND RESULTS The tubes in the bobbin coil inspection plan were examined full length.
Tube wall degradation was evaluated using the phase analysis technique for determination of the origin and percentage of tube wall loss represented by the indication. The data were independently analyzed by two groups of certified Level IIA or Level III data analysts.
Any discrepancies t'etween the two sets of evaluation results were reviewed and resolved by a Lead Level III Eddy Current Examiner.
The examination was conducted with a Zetec MIZ-30$ digital eddy current acquisition system and analyzed utilizing the Eddynet 95* digital analysis system. The frequencies utilized during the bobbin coil examination were as follows:
400 KHz differential and absolute 100 KHz differential and absolute 600 KHz differential and absolute 10 KHz differential and absolute 400/100 KHz differential support ring mix 600/100 KHz differential copper mix 400/600/100 KHz differential transition mix The primary frequency of 400 KHz satisfied the requirements of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code for the examination of non-ferromagnetic steam generator tubes.
During inspections previous to 1996. all dent measurements were performed using the 400 KHz absolute. This technique was again used during the 1996 inspection, but only to perform a comparison to historic data on a select group of tubes. All other dent analysis was performed using the differential opport mix and a voltage base of 2.75 volts on the 20% 00 ASME signal to standa dize dent testing with current. industry practices.
,5 LIC-97-082 Attachment Page 4 The 100 KHz frequency was provided to assist in the confirmation of flaw indications.
The 100 kHz absolute detected gradual wall thickness variations. The 600 KHz frequency was provided to assist the analysts with additional mixing capabilities in the event of excessive outside diameter (0D) tube deposits. The 10 KHz frequency was provided to facilitate locating the probe position in the steam generator. The 400/100 KHz and the 600/100 KHz mixes were used to eliminate the tube support and 00 tube deposit signals. The 400/600/100 mix was used to evaluate areas of sharp transition such as top of tubesheet expansion transitions. Other mixes were performed as required by the data analyst.
Steam Generators RC-2A and RC-28 both were found to have indications in the 1-19% range, 20-39% range and 40% or greater range. Support notation for each steam generator is j
shown in Figure 1.
All indications which were reported with a percent through-wall value are listed in Tables 1 and 2.
Not all pluggable indications can be directly interpreted from the percent through-wall list due to decisions made during diagnostic examination and historic review. The pluggable tube lists in Tables 3 and 4 provide summary descriptions of the reason each tube was plugged.
l l
Indications which were present during past inspections generally did not show I
significant growth, but may have been dispositioned as pluggable based on current data i
analysis guidelines. Methods used to disposition bobbin indications varied scmewhat based on the location of each indication of interest.
However, the following logic generally applied:
)
i l
If a bobbin coil indication confirmed by RPC was reported as 240% through-wall, the tube was plugged.
If the bobbin coil detected an indication which was
)
confirmed to be cracklike (either axial or circumferential) by RPC, the tube was plugged.
If the bobbin coil detected an indication at a tube support intersection and RPC confirmed the presence of a cracklike or volumetric indication, the tube was plugged.
If the bobbin coil detected a freespan indication at a location other than at the tube supports, and RPC showed a volumetric indication (not axial or circLerential). but the indication showed f
i change from a review of 1984 and 1985 historical data, the tube was plugged.
Indications which did not fall into one of the above categories generally were i
j I
left in service.
All bobbin coil techniques used were intended to meet the current requirements of the EPRI Appendix H qualifications. All tubes were or1 gin 311y inspected full length with the.540"/.560" probe, and indications were flagged for later characterizing and/or sizing with qualified techniques.
Bobbin coil dent measurements of a pre-selected historic sample of tubes which had previously restricted passage of the.560" probe were performed utilizing the traditional method from pst inspections, whereby the sizing is based on the machined
?
j a-LIC-97-082 Attachment l
Page 5 i
dent in the calibration standard, and one volt equals one mil average radial reduction in tube diameter on the 400 kHz absolute channel. Comparison of current to past data indicated that there has been little change in the average dent size of the test group.
OPPD therefore concluded that active dentinq, last observed in the mid-1980's, continues j
to be arrested.
Bobbin coil dent measurements were also performed using the industry standard technique j
which utilizes the pr1 mary 400/100 KHz differential mix channel, and bases the sizing l
on the 20% Flat Bottom Holes in the ASME standard at 2.75 volts. This information is now available for use to track dented locations during future inspections.
I ROTATING C0Il EXAMINATIONS AND RESULTS Rotating coil examinations were performed at the top-of-tubesheet transitions on the j
hot and cold legs, in low-row U-bends and at bobbin coil suspect indications as a 1
diagnostic tool. A special region of each steam generator was also inspected where it was concluded by thermal-hydraulic analysis that the potential for deposits and resultant axial cracks may be higher than elsewhere in the steam generators.
The tubes in the Top of the Tubesheet RPC Program were inspected in the expansion transition regions of each steam generator. The data were analyzed for the presence of crack-like indications similar to those found in the expansion transition regions at other plants.
Terrain plots were used during the analysis effort to improve the probability of detecting circumferential cracks, l
The RPC exams performed at U-bends, dents. freespan sections, and tube support l
intersections were performed to determine if stress corrosion cracking is present in suspect areas of the steam generators, to verify bobbin coil results, and to characterize the indications seen with the bobbin coil probe.
Plus Point and conventional (or Delta Coil) RPC probes were both used during this j
l inspection.
The Plus Point probe was the main probe used for the bulk of the RPC examination and Delta coil probe was used on a very limited basis as a supplement to Plus Point for characterization of indications.
The frequencies used for the 3 coil top-of-tubesheet examination are as follows:
400 kHz Pancake. Mid-Freq. Plus coil, and High Freq. Plus coil 200 KHz Pancake, and Mid-Freq. Plus coil 100 KHz Pancake, and Mid-Freq. Plus coil 700 KHz Pancake, and High-Freq.'Plus coil
_ - _ _ _ _ _ _.. - - _ _ _ _ _ - _ - _ _. - _ _ _ - - - - - _. _ - - - _ ~ -
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LIC-97-082 Attachment Page'6 The frequencies used for the U-bend RPC examinations were as follows:
400.KHz Mid-Freq. Plus coil 300 KHz Mid-Freq. Plus coil 100 KHz Mid-Freq. Plus coil 10 KHz Mid-Freq. Plus. coil The frequencies for the Delta probe RPC examinations were as follows:
400 KHz Pancake Axial and Circumferential coils l
200 KHz Pancake, Axial and Circumferential coils 100 KHz Pancake, Axial and Circumferential coils 300 KHz Pancake, Axial and Circumferential coils Other special coil arrangements including two-coil (pancake and mid-freq. Plus Point) and three coil (pancake, mid-freq. plus coil and 0.080" pancake coil) techniques were used, but with the same frequency arrangements listed above.
l There was no circumferential cracking found during any of the examinations. No axial f
indications were found in upper bundle areas predicted to have high deposition of impurities. Tubes'with volumetric indications in these areas which showed change from historical data were prevent 1vely plugged.
j Diagnostic exams were performed on approximately 1200 bobbin coil indications.
One tube, Row 7 Line 26 in SG RC-2A, was found to have a 2.6" freespan axial indication confirmed with rotating coil examination.
This indication spawned a special RPC i
expansion program in other suspect areas. A total of four additional freespan axial indications were found in both steam generator RC-2A and RC-28. All of these tubes were plugged.
Six tubes with axial indications found just above the top of the hot leg tubesheet expansion were also plugged. These indications were short in length, and were bounded j
by the 100% examination of the hot leg expansion transitions.
One circumferential indication was found (Row 101 Line 54) in the hot leg of steam generator RC-28, but 1s believed to be from a loose part, as it is on the periphery, I
is well above the top of-tubesheet transition, and shows a volumetric rather than crack-like tendency. The indication was stabilized and plugged due to its circumferential orientation. Other circumfercatially oriented indications were also found on the cold leg of steam generator RC-2A.
It was concluded that the indications were volumetric with circumferential orientation and were reported as CVI (Circumferential Volumetric j
0 Indications).
3 i
i
.N LIC-97-082 Attachment Page 7 The CVI indications were originally flagged with the bobbin coil examination as DTI (Distorted Tubesheet Indication) on the cold leg of steam generator RC-2A.
After initial diagnostic inspection of these indications, a 1000 tube (20%) sample in steam generator RC-2A was inspected and additional CVI indications were found and bounded in Row 17. A sample of 25 tubes from the same area were also inspected in steam generator RC-28, but no similar indications were found. All CVI indications were stabilized and plugged.
IN SITU PRESSURE TEST RESULTS l
t Five tubes with defects were tested with the ABB/CE In-Situ Pressure Test device. These tubes were tested to demonstrate that leakage would be below allowable limits at normal operating differential pressure (NODP), at 1.4 times peak accident (main steam line break (MSLB)) pressure, and that they would be able to sustain a pressure of 3 times N00P without burst in accordance with Draft NRC Regulatory Guide 1.121.
The five indications tested covered the known defect types in the steam generators, which are axial indications, non-oriented volumetric indications, and circumferentially oriented volumetric indications.
Table 5 shows the tubes tested with the In-Situ Pressure Test method, sumarizes the reason each tube was tested, and gives the reuts of each test.
None of the five tubes tested experienced catastrophic failure when pressurized to 3 times NODP, nor did they leak at N0DP or 1.4 times MSLB pressure.
RPC testing performed with the Plus Point probe after the In-Situ Pressure tests showed no change in the signal produced by the defects when compared to the data taken prior to the In-Situ tests. The indications tested by this method bounded the severity of the other known indications 1n the steam generators, as well as any indications which may be present and not detected. Therefore, based on the In-Situ pressure test results and extensive historical reviews of eddy current data which show little or no growth of indications in the FCS steam generators since 1984, operation until the next scheduled inspection is justified.
CONCLUSIONS As a result of the inspection OPPD has reached the following conclusions.
1.
Bobbin coil indications of through-wall degradation generally showed little change from the last inspections and only minor change from the 1984 100%
inspection.
l
M LIC-97-082 Attachment Page 8 2.
After an extensive (1000 top-of-tubesheet expansion transition inspection on the hot leg side of each steam generator and a 20% sample of the cold leg expansion transitions in RC-2A with RPC. there were no circumferential cracks detected.
One circumferential indication was found in steam generator RC-2B at 9.5 inches above the hot leg tubesheet, but is believed to be from a loose part due to its height and location on the periphery. The indication also appeared volumetric rather than crack-like in nature. This tube was stabilized and plugged. There were no circumferential cracks detected as a result of RPC examinations performed in other suspect areas such as dented tube support intersections and tight radius U-bends.
' ied:
3.
The most significant indications for all inspections
~
Circumferential Volumetric Indications on the to" Mesheet in the cold leg side of steam generator RC-2A. all of which were located in Row 17.
Volumetric indications in both steam generators which required plugging due to minor change when compared to data from 1984 and 1985.
Axial indications detected in both steam generators, both in the f eespan and just above the top of the hot leg tubesheet. These appear to be dormant or very slowly progressing based on historical reviews performed.
4.
Three tubes in steam generator RC-2A and two tubes in steam generator RC-28 were examined with an in-situ pressure test tool to verify structural integrity. All tubes tested met the requirements of Draft NRC Regulatory Guide 1.121. and none showed evidence of leakage.
RPC testing conducted after the pressure tests showed the indications had not changed as a result of the pressure tests.
5.
All tubes with the above significant indications were plugged. Circumferential indications were stabilized as well. Overall. 36 tubes were plugged in steam generator RC-2A and 21 tubes were plugged in steam generator RC-28.
6.
Based on the results of the extensive eddy current examination and the in-situ pressure tests performed, operation of the FCS steam generators until the next scheduled inspection during the 1998 FCS Refueling Outage is justified.
LIC-97-082 FORT CALHOUN STEAM GENERATOR ELEVATION DRAWING HTE Hotleg Tube End HTS Hot Leg Tubesheet i
H1-H6 Hot Leg Full Supports c o o c c :, c c c H7 Hot Leg Partial Egg Crato up i
u H8 Hot Leg Partial Drilled Support DHB DiagonalHot Bottom Edge f
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8 DHT Diagonal HotTop Edge
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i V1-V3 VerticalSupports
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[DCB 5
DCT DiagonalCold Top Edge v1 DCB DiagonalCold Bottom Edge v2 C8 Cold Leg Partial Drilled Support DHT
[C3 C7 Cold Leg Partial Egg Crate oss N. h C6-C1 Cold Leg Full Jupports CTS Cold Leg Tubesheet I)
[C7 CTE Cold leg Tube End l
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$A' LIC-97-082 TABLE 1 LIST OF RC-2A INDICATIONS j
Row /Line
%tw Location Row /Line
%tw Location 8/125 56 HTS + 3.06 34/37 7
HTS + 4.87 8/125 15 CTS + 3.02 35/50 19 HTS + 1.86 11/94 35 HTS + 2.29 35/50 11 HTS + 1.01 j
12/49 12 CTS + 3.16 35/96 20 HTS + 3.93 j
13/100 24 HTS + 4.51 38/73 22 HTS + 2.67 15/100 13 HTS + 6.11 38/93 7
HTS + 3.88 15/106.
85-C2 + 0.57 39/44 2
HTS + 4.25 18/95 14 HTS + 1.02 39/50 12 HTS + 1.15 f
19/36 36 CTS + 0.6 39/52 8
HTS + 1.78 20/69 45 HTS + 0.68 39/66 27 HTS + 1.67 20/77 37 HTS + 0.33 40/43 9
HTS + 2.48 21/36 11 HTS + 2.35 40/51 28 HTS + 0.74 21/36 2
HTS + 3.92 41/64 22 HTS + 0.67 22/85 19 CTS + 3.82 41/86 12 HTS + 3.4 23/36 7
HTS + 3.66 41/96 14 HTS + 3.60 1
23/38 7
HTS + 3.39 42/25 11 HTS + 1.37 23/92 23 HTS + 1.05 42/71 30 HTS + 0.87 23/108 3
HTS + 1.15 43/86 19 HTS + 3.39 25/94 7
HTS + 3.78 43/86 1
HTS + 2.74 27/40 2
HTS + 4.73 44/15 4
HTS + 0.38 27/120 13 CTS + 24.12 45/86 28 HTS + 1.67 l
27/120 7
HTS + 32.27 46/53 4
HTS + 3.78 28/23 25 HTS + 1.03 47/46 19 HTS + 2.34 28/41 7
HTS + 3.4 48/53 16 HTS + 5.03 l
28/63 13 HTS + 5.59 48/117 50 C5 + 4.37 28/73 34 HTS + 1.26 51/58 11 HTS + 2.44 i
29/40 14 HTS + 5.44 51/90 6
HTS + 3.26 29/42 19 HTS + 0.56 52/47 8
HTS + 1.46 i
I 29/60 30 HTS + 6.26 52/53 2
HTS + 1.98 29/70 35 HTS + 4.38 52/59 24 HTS + 3.54 29/96 19 HTS + 3.58 54/65 18 HTS + 3.6 l
29/102 5
HTS + 1.92 56/47 14 HTS + 2.72 29/104 25 HTS + 1.68 56/53 14 HTS + 2.97 l
30/105 8
HTS + 1.07 56/55 15 HTS + 2.87 31/36 10 HTS + 2.48 57/50 12 HTS + 3.34 l
31/40, 2
HTS + 5.43 57/98 3
HTS + 0.99 32/47 14 HTS + 4.53 58/61 47 HTS + 1.2 32/113 4
H1 + 22.53 58/81 2
HTS + 3.78 33/80 '
3.
HTS + 5.47 58/89 9
HTS + 3.25 34/31 36 HTS + 1.07 59/64 23 HTS + 3.23 J
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'kN LIC-C7-082 -
TABLE 1 LIST OF RC-2A INDICATIONS Row /Line
%tw Location 59/66 16 HTS + 3.65 j
59/70 15 HTS + 1.12 62/67 8
HTS + 3.2 62/71 2
HTS + 3.75 62/89.
6 CTS + 2.2 65/58 31 HTS + 3.04 67/28 22 H4 - 1.82 73/58 14 HTS + 1.27 77/46 12 HTS + 0.47 83/86 27 DHB + 7.96
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94/43 33 HTS + 2.45 h
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LIC-97-082 TABLE 2
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LIST OF RC-28 INDICATIONS i
Location Row /Line
%tw Location Row /Line
%tw.
7/80 6
HTS + 1.59 27/88 18 HTS + 5.15 l
9/66 36 HTS + 1.67 27/88 9
HTS + 3.02 9/110 24 HTS + 0.62 '
27/88 8'
HTS + 4.59 I
10/33 24 HTS + 1.99 27/90 13 HTS + 2.87 f
12/27 4
HTS + 8.45 27/90 12 HTS + 5.51 13/;S 36 HTS + 1.23 27/90 12 HTS + 4.59 13/78 39 HTS + 0.73 28/21 11 HTS + 2.17 I
13/108 12 HTS + 1.07 28/41 20 HTS + 9.85 i
14/15 10 HTS + 2.16 28/41 10 HTS + 2.62 3
'15/70' 35 HTS + 0.75 28/47 3
HTS + 3.41 l
1-15/100 2
HTS + 5.13 28/51 13 HTS + 4.39 15/110 17 HTS + 0.87 28/57 35 HTS + 6.54 18/43 28 HTS + 2.39 28/81 3
HTS + 5.52 20/93 33 HTS + 4.22 28/83 9
HTS + 6.78 20/97 25 HTS + 3.33 28/91 2
HTS + 1.71 20/103 16 HTS + 2.75 29/18 15 HTS + 1.08 j
2 20/107 18 HTS + 2.08 29/54 27 HTS + 6.31 l
21/14 18 HTS + 0.91 29/64 17 HTS + 4.54 21/90
.29 HTS + 3.97 29/64 9
HTS + 16.95 21/90 19 HTS + 5.34 29/80 4
HTS + 7.47 21/94 19 HTS + 2.24 29/80 2
HTS + 16.16 22/15 11 HTS + 1.24 29/84 10 HTS + 4.42 22/23 5
HTS + 1.4 29/86 8
HTS + 3.55
)
22/31 5
HTS + 4.69 29/86 4
HTS + 4.47 22/89 2
HTS + 13.39 29/90 15 HTS + 3.63 l
22/93 16 HTS + 2.14 29/90 9
HTS + 5.72 22/93 1
HTS + 8.23 30/31 18 HTS + 4.32 23/12 24 HTS + 0.85 30/33 15 HTS + 5.01 23/90 2
HTS + 2.28 30/43 9
HTS + 7.32 24/17 9
HTS + 1.56 30/63 9
HTS + 9.58 24/19 16 HTS + 2.28 30/83 22 HTS + 0.89 24/33 8
HTS + 3.71 30/37 7
HTS + 4.22 24/37 32 HTS + 5.34 3:/84 10 HTS + 5.02 25/18 27 HTS + 1.89 11/84 9
HTS + 3.6 l
25/44 8
HTS + 4.96 31/84 7
HTS + 7.12 25/56 19 HTS + 29.76 31/84 6'
HTS + 8.09 25/80 16 HTS + 4.8 -
11/84 5
HTS + 5.48 25/90 34 HTS + 4.08 3i/88 14 HTS + 2.79 27/42 19 HTS + 4.86 31/63 11 HTS + 2.47 27/46 19 HTS + 9.38 31/88 9
HTS + 3.41 27/84 HTS + 3.62 32/47 2
HTS + 6.98 1
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g gr LIC-97 082 i
TABLE 2 UST OF RC-2B INDICATIONS
{
Row /Line
%tw Location Row /Line
%tw Location 32/79 10 HTS + 4.39 37/50 13 HTS + 4.9 32/87 9
HTS + 4.47 37/56 13 HTS + 8.53 33/20' 9
HTS + 0.74 37/60 7
HTS + 6.21 i
I 33/34 25 HTS + 11.8 '
37/62 4
HTS + 6.06 33/46 6
HTS + 5.29 37/82 6
HTS + 4.08 33/78 10 HTS + 2.18 37/102 5
HTS + 0.78 33/80 31 HTS + 1.57 38/37 4
HTS + 3.83 33/80 21 HTS + 7.49 38/55 6
HTS + 5.87 33/104 5
HTS + 0.83 38/63 20 HTS + 5.58 34/57 9
HTS + G.4 38/63 7
HTS + 5.22 34/59 20 HTS + 2.96 38/63 1
HTS + 6.4 i
34/75 3
HTS + 7.68 38/79 9
HTS + 7.28 34/89 18 HTS + 3.91 38/85 8
HTS + 3.54 35/22 4
HTS + 1.68 38/101 15 CTS + 1.19 35/52 17 HTS + 8.89 39/48 18 HTS + 1.14 35/52 16 HTS + 10.26 39/48 11 HTS + 8.56 35/78 14 HTS + 7.08 39/50 38 HTS + 2.02 35/78 9
HTS + 8.2 39/58 6
HTS + 8.18 l
35/80 12 HTS + 5.46 39/60 18 HTS + 3.99 35/88 24 HTS + 4.26 39/60 14 HTS + 6.5 35/88 11 HTS + 3.95 39/60 6
HTS + 6.21 35/88 7
HTS + 5.28 39/64 12 HTS + 4.9
[
35/88 2
HTS + 2.07 39/76 5
HTS + 6.82 36/35 5
HTS + 2.97 39/84 10 HTS + 3.06 36/45 24 HTS + 9.64 39/84 9
HTS + 1.76 36/45 17 HTS + 8.61 39/102 9
HTS + 0.96 j
36/47 6
HTS + 24.16 39/120 13 H6 + 11.75 i
36/47 6
HTS + 22.58 40/65 11 HTS + 6.66 l
i 36/69 18 HTS + 6.09 40/65 8
HTS + 8.82 j
36/79 19 HTS + 0.86 40/65 5
HTS + 5.12 36/87 23 HTS + 2.41 40/81 14 HTS + 2.22 36/87 7
HTS + 2.98 40/83 21 HTS + 5.05 36/87 6
HTS + 4.04 40/83 14 HTS + 4.35 36/93 11 HTS + 2.76 40/83 8
HTS + 2.51 36/95 6
HTS + 3.39 40/83 8
HTS + 1,77 36/103 35 HTS + 0.66 40/83 4
HTS + 3.74 37/32 ~
5 HTS + 3.95 41/56 19 HTS + 2.6 37/38 17 HTS + 9.81 41/56 14 HTS + 6.88 37/38 11 HTS + 3.84 41/56 12 HTS + 4.77 37/44 15-HTS + 6.39 41/60 10 HTS + 5.79 37/50 14 HTS + 5.47 41/70 24 HTS + 1.74
=....
l N
LIC-97-082 TABLE 2 LIST OF RC-28 INDICATIONS Row /Line
%tw Location Row /Line
%tw Location 4164 3
HTS + 16.36 47/52 3
HTS + 5.28 4166.
16 HTS + 3.03 47/62 12 HTS + 3.09 41/84 18 HTS + 2.48 47/74 5
HTS + 2.81 42/45.
8 HTS + 5.79 47R8 12 HTS + 2.33 42/69 3
HTS + 3.52 47R8 9
HTS + 4.38 42/83 14 HTS + 16.52 47ne 4
HTS + 3.41 42/83 10 HTS + 4.85 47/80 5
HTS + 3.33 42/83 5
HTS + 3.13 47/82 29 HTS + 1.35 3
42/85 19 HTS + 2.97 48/47 5
HTS + 5.27 f
42/85 7
HTS + 3.77 48/53 15 HTS + 4.36 42/85 7
HTS + 3.43 48/69 14 HTS + 2.94 43/50 7
HTS + 5.72 48/69 14 HTS + 17.21 43/82 1
HTS + 3.9 46l69 9
HTS + 2.25 44/33 27 HTS + 4.3 48/69 4
HTE + 3.22 44/33 15 HTS + 3.59 48/69 1
HTS + 4.43 44/71 2
HTS + 10.42 48/71 18 HTS + 2.92 44/75 5
HTS + 6.38 48a1 6
HTS + 4.67 44/77 9
HTS + 5.76 48/73 21 HTS + 8.58 44/77 5
HTS + 11.65 4893 12 HTS + 3.15 44n7 4
HTS + 15.45 48/73 3
HTS + 4.07 j
44/77 3
HTS + 10.08 4865 10 HTS + 3.97 44/79 8
HTS + 9.53 4867 15 HTS + 9.81 44n9 6
HTS + 4.17 49/44 24 HTS + 2.71 44/85 15 HTS + 3.45 49/44 18 HTS + 3.26 j
44/101 28 HTS + 0.79 49/54 16 HTS + 2.93 45/44 21 HTS + 2.56 49/54 9
HTS + 4.25 45/50 4
HTS + 5.18 49/54 4
HTS + 4.61 45/60 11 HTS + 6.01 49/70 24 HTS + 4.93 45/62 2
HTS + 3.66 4998 16 HTS + 4.84 45/74 14 HTS + 3.02 50/63 17 HTS + 4.78 45/78 11 HTS + 1.96 50/69 16 HTS + 8.55
~ 46/39 13 HTS + 3.52 51/26 13 HTS + 0.71 46/51 7
HTS + 3.98 51/26 12 HTS + 1.05 46/53 5
HTS + 5.1 51/28 11 HTS + 1.46
[
46/55 9
HTS + 4.52 51/42 8
HTS + 4.97 46/55 9
HTS + 5.26 51/60 24 HTS + 2.72 46/55 4
HTS + 4.06 51/60 4
HTS + 3.55 46R3 8
HTS + 3.21 51/64 5
HTS + 3.45 i
46/73 7
HTS + 2.29 51/66 5
HTS + 3.74 46/77.
9 HTS + 4.66 51/66 1
HTS + 2.78 47/52 15 HTS + 3.67 51/68 10 HTS + 5.59
a.)
LIC-97-082 TABLE 2
'o LIST OF RC-28 INDICATIONS Row /Line
%tw Location Row /1.ine
%tw Location
)
51/84 11 HTS + 2.42 59/70 7
HTS + 3.66 52/27 19 HTS + 1.24 60/51 1
C2 + 0.14 52/27 8
HTS + 0.96 64/89 16 HTS + 2.61
)
52/51 21 HTS + 4.03 65/86 21 HTS + 3.02 52/57 21 HTS + 3.5 66/55 4
HTS + 3.07 52/57 9
HTS + 3.91 67/90 10 HTS + 18.67 1
52/63 5
HTS + 4.09 69/36 22 HTS + 0.8 52/67 10 HTS + 3.78 70H1 20 HTS + 35.61 l
52/69 16 HTS + 2.49 70/83 13 HTS + 1.5 52/69 15 HTS + 3.27 71/48 10 HTS + 1.86 53/56 3
HTS + 4.58 71/60 23 HTS + 16.21 53/64 2
HTS + 5.07 71/62 25 HTS + 2.55 53/94 10 HTS + 2.38 72/65 1
HTS + 2.47 54/43 36 HTS + 0.75 77/76 20 HTS + 1.49 54/61 5
HTS + 11.78 79/68 8
HTS + 0.61 54/65 16 HTS + 19.86 81/80 36 HTS + 5.37 54/67 15 HTS + 16.97 89/56 11 HTS + 5.03 54/69 16 HTS + 18.7 93/86 49 C3 + 0.03 54/69 7
HTS + 25.28 94/53 19 HTS + 8.59 54/73 34 HTS + 1.81 55/56 16 HTS + 4.31 55/56 5
HTS + 3.28
)
55/62 9
HTS + 2.49 55/64 20 HTS + 14.49 55/64 15 HTS + B.79
)
55/64 12 HTS + 12.31 55/74 10 HTS + 1.8 55/98 18 HTS + 0.98 55/110 6
HTS + 3.77 56/51 31 HTS + 3.1 56/69 17 HTS + 4.74 56/73 12 HTS + 1.88 57/48 22 HTS + 4.33 57/56 11 HTS + 2.5 57/62 24 HTS + 16.48 57/62 15 riTS + 3.44 57166 2
HTS + 3.48 57/68-9-
hts + 5.16 58/73 10 HTS + 4.76 59/32 3
HTS + 1.34 59/50 25 HTS + 3.89 i
1
i; aI LIC-97-082 TABLE 3 UST OF RC-2A TUBES PLUGGED Row /Line Flaw Type Location.
Reason Plugged 7/26 sal H2 +6.12
' AxialIndication 8/125-
_VOL HTS +3.23 Sized greater than 40% through wall 2
15/106 VOL C2 +.57 Sized greater than 40% through wall
)
17/56 CVI CTS +0.02 Unfamiliar damage type 4 -
17/60 CVI CTS +0.02 Unfamiliar damage type, Historical review indicated change j
17/62 CVI CTS +0.08 Unfamiliar damage type, Historical review indicated change 17/64 CVI CTS +0.01 Unfamiliar damage type, Historical review indicated change
~
CVI CTS +0.14 Unfamiliar damage type, Historical review indicated change 17/66 1790 CVI CTS +0.11 -
Unfamiliar damage type, Historical review indicated change 1762 CVI '
CTS +0.14 Unfamiliar damage type, Historical review indicated change 1764 CVI CTS + 0.05 Unfamiliar damage type, Historical review indicated change 1766 CVi CTS +0.11 Unfamiliar damage type, Hi.storical review indicated change 17H8 CVI CTS +0.08 Unfamiliar damage type, Historical review indicated change l
17/86 CVI CTS +0.23 Unfamiliar damage type, Historical review indicated change 17/88 VOL CTS +0.24 Historical review indicated change 17/100 CVI CTS +0.03 Unfamiliar damage type, Historical review indicated change 17/104 CVI CTS +0.09 Unfamiliar damage type, Historical review indicated change 18/63 VOL CTS +0.06 Historical review indicated change 20/69 sal HTS +1.01 Axiailndication 23/68 SAI HTS +0.84 Axial Indication 2861 sal HTS +1.23 Axial Indication 2893 sal HTS +1.42 Axial indication l.
33/82 sal H1+1.20 Axial Indication j
34/59 VOL HTS +0.08 Historical review indicates possible change 39/68 MAI HTS +17-26 Axial Indications 40/77 VOL HTS +0.25 Historical review indicates change 47/64 VOL DHB +0.0 Historical review indicates change 47/84 VOL C6 +20.58 Historical review indicates change 48/117 PIT C5+4.1 Sized greater than 40% through wall 58/61 PIT HTS +1.34 Sized greater than 40% through wall 4
71/54 VOL DHT+2.7 5.1 Historical review indicates change 71/58 VOL Historical review indicates change 3
71/62 VOL Historical review indicates change 80/25 VOL H7.94 Historical review indicates change 82N7 VOL HTS +0.04 Historical review indicates change 93/66 VOL Historical review indicates change
[ Definitions of indications can be found at the bottom of Table 4.
l
,d O/
LIC-97-082 TABLE 4 LIST OF RC-28 TUBES PLUGGED Row /Line Flaw Type Location Reason Plugged 14/69 SAI HTS +0.39 Axiat indication 15/64 SAI HTS +0.93 Axial Indication 1798 VOL CTS +0.0 Historical review indicates possible change 17/96 VOL CTS +0.0 Historical review indicates possible change 27/84 VOL HTS +0.19 Historical review indicates change 32R9 MAI HTS +16-36 Axial Indications 3592 VOL HTS +28.88 Historical review indicates change 36a3 MAI HTS +2138 Axial Indications 40/85 VOL H4+36.03 Historical review indicates change 59/32 VOL H7+1.81 Historical review indicates change 60/51 VOL C2 +0.13 Flaw at support, assumed to be active 6093 OBS V2 Obstructed to 0.540" diameter probe 61/66 VOL H4+0.28 Flaw at support, assumed to be active 60/68 VOI.
Historical review indicates change H
71/96 VOL H7 +21.41 Historical review indicates change 77/96 VOL H4+17.83 Historical review indicates change 88/63 VOL H1 + 3.70 Historical review indicates chan00 91/64 VOL C2 +0.7 Flaw at support, assumed to be active 93/86 PIT C3 +.03 Sized greater than 40% through wall 10099 VOL HTS +13.35 Historical review indicates change
I'"**'"*
101/54 SCI HTS +9.5 indicated change
~ 'elitions:
CVI - Circumferential Volumetric Indication OBS - Obstructed Tube DSI-Distorted Support Indication PIT - Pitiike Indication DTI - Distorted Tubecheet Indication SAI-Single AxialIndication MAI-Multiple AxialIndication:,
SCI - Single Circumferential Indication NQI - Non-Quantifiable Indication VOL - Volumetric (non-oriented) Indication
M' r
UC-97-082
~
TABLE 5 g
IN-SITU PRESSURE TESTS
. StG Tube Defect Description Reason for Test Pressure Leakage Pressure! eakage L
Pressure Lookage Bobbin History :
Resp.
Resp.
e se at 52 RC-2A R7L26 sal,2.6* long. H2+6.12 1600 psi 0
2500 psi 0
4600 psi
- 0 Unfamiliar flaw type.
4.6 V E*
RC-2A R17L72 CVI,360 deg, CTS +0.14
- [
k 1800 psi 0
2800 psi 0
5000 psi 0
Not present in 1984 D
circumferential Threshold of bobbin RC-2A R39L68 mal, HTS +17-26 report-1 V MAI 1600 psi 0
2500 psi 0
4650 psi 0
bobbm in 1996 or able prior exams s
n ca "
RC-2B R93L86 VOL @ C3+.02 1600 psi 0
2500 m!l 0
4650 psi 0
1990 - Not present e
DS i
~"
8"9' 1{4V 3.3 V RC-2B R32L79 MAI, HTS +16-36 Worst case cracks 1650 psi 0
2550 psi 0
4050 psi 0
1992 - no change g,
g, 1984-no change iln-Situ pressure test results show that each of these indications meet Draft Reg. Guide 1.121 structural integrity requirements, as well as %monstrating leakage integrity at
~
worst case accident pressure. Post in-situ RPC exams showed no change in any of these indications as a result of the hydro tests.
H Definitions:
~
]
CVI - Circumferential Volumetric Indication NOl - Non-Quantifiable Indication
]
j DSI-Distorted Support Indication sal-Single AxialIndication DTI - Distorted Tubesheet Indication VOL - Volumetric (non-oriented) Indication MAI-Multiple AxialIndications
.I x
4 i
..m m..m
_. _.. _ ___ _ - ____ _ _. -. _ _ _ _ _ _ _ _ _ _ _. _ _ _ - - -. _ _ _ _ _, _ ~, -. -
--m-4
. ~
-e -
-