Text

Cycle 9 Refueling Outage
	ML20211F903
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Site:	Sequoyah
Issue date:	06/30/1999
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Sequoyah Nuclear Plant 1

Unit 1 Cycle 9 Refueling Outage September 1998 Prepared By: 1 h 4 AA [)) k Verified By: dt /(ID. Am.o 9 v

Approved By: 1 's , M [0 fa p a =;ir O

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TABLE OF CONTENTS Introduction 3 SG Tube Inservice inspection Scope 4 Integrity Assessment Criteria 5 SG Tube Inspection Results 7 PWSCC U-Bend 7 PWSCC TTS 9 ODSCC TTS 11 PWSCC TSP 12 ODSCC TSP 15 AVB Wear / Cold Leg Wastage /Other Plugged Tubes 16 Secondary Side Inspection Scope and Results 17 Conclusions 18 Tables 1 Summary of Unit 1 Cycle 9 SG Eddy Current inspection / Tube Plugging Results 2 Resolution of Defective Tubes and All Service Induced Wall Loss Indications 3 Axial PWSCC at Dented TSPs Left inservice 4 Axial PWSCC at Dented TSPs Removed From Service lisglsqntuictinrc 90 day rpt 2

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INTRODUCTION During the scheduled Sequoyah Nuclear Plant (SON) Unit 1 Cycle 9 refueling outage (U1C9 RFO) extensive inservice inspections were conducted in a!! four steam generators (SGs) to address all active and potential damage mechanisms identified in the Unit 1 Degradation Assessment. The results of the inspections were classified as follows:

SG1 SG2 SG3 SG4 Bobbin C-1 C-2 C-2 C-2 TTS RPC C-2 C-2 C-2 C-2 Freespan Dents C-1 C-1 C-1 C-1 U-Bend + Point C-2 C-2 C-3 C-3 Dented intersection inspections are not applicable to the categorization above.

A buffer zone is established in accordance with SQN's response to NRC's Request for Additional information regarding Technical Specification Change for ODSCC Alternate Repair Criteria (ARC).

ARC implementation continued during this inspection due to the detecticr. of outside diameter stress corrosion cracking (ODSCC) at tube support plate (TSP) intersections. A report was issued 90 days after restart U1C9 with details of this implementation.

This report fulfills the reporting requirements of SON Technical Specification ;

section 4.4.5.5.b for reporting results of SG inservice inspection and section j 4.4.5.5.c for C-3 reporting. l lisglsqntuic9/ntc 90 day rpt 3

2 SG TUBE INSERVICE INSPECTION SCOPE The SON SG tube inservice inspection (ISI) initial sample and expansion for all

.SGs and all damage mechanisms was as follows:

100% full-length bobbin examination in all 4 SGs 100% hot leg top of tubesheet (TTS) (WEXTEX transition region) examination in all 4 SGs with 0.080 mid range /0.080 high frequency / 0.115 mid range rotating pancake coil (RPC) probe.

100% Row 1 and 2 U-Bend examinations in all 4 SGs with raagnetic biased ZETEC plus point Row 1&2 U-Bend RPC probe.

100% >=5 volt dented TSP intersections from H01 to H07 in SGs 1,2, and 4 with + Point probe.

100% >=5 volt dented TSP intersections from H01 to H05 and a 20%

random sample of H06 in SG 3 with plus point probe.

100% < 5 volt dented TSP intersections from H01 to H02 and a 20% random sample of H03 in SGs 1 and 2 with plus point probe.

100% <5 volt dented TSP intersections from H01 to H04 and a 20% random sample of H05 in SG 3 and 4 with plus point probe.

100% of <2 volt dented TSP intersections were examined during the bobbin coil examination utilizing the qualified technique for detection of primary water stress corrosion cracking (PWSCC). This requires an additional two days of extensive analyst training and testing.

'The inspection of dents is performed to envelop the highest TSP with identified PWSCC indications since the PWSCC degradation mechanism is strongly temperature dependent.

- All test techniques used for detection were EPRI Appendix H qualified examination techniques and validated for use at SQN. Sizing techniques were also Appendix H qualified where available, if qualified sizing techniques did not exist, the best available technique was used.

- Due to the detection of TSP PWSCC at H06 (buffer zone) in SG 3, the plus

. point examination scope in >5 volt dented TSPs in SG 3 was expanded to 100% of H06 and 100% of H07. No further expansions were necessary.

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INTEGRITY ASSESSMENT CRITERIA All crack-like indications were screened for in-situ pressure testing using guidance from the Draft EPRI In-Situ Guidelines and using critical flaw parameters developed specifically for Sequoyah by Westinghouse. Both documents support a three-step process for screening for structural and for leakage integrity, beginning with length for structural integrity and voltage for leakage integrity.

The screening values for 3 times normal operating detta pressure are as follows.

Uncertainties are accounted for in the screening criteria where applicable:

Axial Flaws for Structural Intearity:

Step 1 - Length Straiaht Lea Row 1 U-Bend Row 2 U-Bend ,

0.465" (ID/OD) 0.714" (ID/OD) 0.672" (ID/OD)

Step 2 - For those indications that exceed Step 1 length - Maximum Depth j Straiaht Lea Row 1 U-Bend Row 2 U-Bend

)

63% for 1.5" flaw 79% for 1.5" flaw 77% for 1.5" flaw (ID/OD) (ID/OD) (ID/OD)

Step 3 - For those indications that exceed both Steps 1 and 2 - Examine average depth versus length Axial Flaws for Leakaae Intearity:

Step 1 - Maximum Voltage Straiaht Leq Row 1 U-Bend Row 2 U-Bend ID OD ID OD ID OD 2V 1.5V 2V l.5V 2V 1.5V .

Step 2 - For those indications that exceed Step 1 - Maximum Depth Straiaht Lea Row 1 U-Bend Row 2 U-Bend ID OD ID OD ID OD 80% 75 % 80% 75 % 80 % 75%

Step 3 - For those indications that exceed both Steps 1 and 2 - Examine Maximum depth versus length - Length at Maximum Depth must exceed 0.1" lisglsqnlutc9/ntc 90 day rpt 5

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Circumferential Flaws for Structural Intnority:

Step 1 - Angle,-223 (ID/OD)

Step 2 - For those indications that exceed Step 1 - Average Depth - 50%

(ID/OD)

Circumferential Flaws for Leakaae Intearity:

Step 1 - Maximum Voltage - 1.5V ID - 1V OD Step 2 - For those indications that exceed Step 1 - Maximum Depth - 80% ID -

'75% OD

- Step 3 - For those indications that exceed both Steps 1 and 2 - Examine Maximum depth versus angle - Angle at Maximum Depth must exceed 20 i

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o SG TUBE INSPECTION RESULTS Table i summarizes the SON U1C9 eddy current testing ISI exams, active degradation, and the repair status of the SGs. Table 2 provides a summary of the tube damage detected and a characterization of the damage morphology.

Degradation Mechanisms Detected PWSCC U-Bend A low occurrence of PWSCC in the Row 1 U-bend area was predicted in the degradation assessment. SG 4 had three tubes with U-Bend PWSCC, and SG 3 had two tubes with U-Bend PWSCC.

C-3 Reportina Reauirement Since the inspection scope for Row 1 and 2 U-Bends in SG 4 was only 155 tubes and in SG 3 was only 146 tubes, these inspections were categorized as C-3. However, since 100% inspection of Rows 1 and 2 was performed and since all indications were in Row 1 tubes, no further investigation was necessary.

PWSCC at inner radius U-Bends is directly related to cold work and residual stresses associated with the tubing manufacturing technique. The Unit 1 U-Bends operated in this condition for multiple cycles and subsequently were in situ stress relieved as a corrective measure. Cracking initiated prior to stress relief and continues to grow to detectable levels. Also, continually improving detection techniques are being utilized. The U-Bends were inspected with magnetic bias plus point for the first time this inspection. The 100% inspection ensures that significant flaws are removed from service.

Circumferential PWSCC was detected in the U-bend area of 1 tube:

l SG Row Column Location Length Max Average Max l or Angle Depth Depth Volts l 4 1 77 H07+3.68 38 76 % 19.77 % 0.58 The crack arc length of 38 was well below the 223 structural screening limit, and a voltage of 0.58 was well below the 1.5 volt leakage screening limit.

Axial PWSCC was detected in the U-bend area of 5 tubes:

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SG Row Column Location Length Max Average Max or Angle Depth Depth Volts 1 1 39 H07+10.57 0.49" 90 % 57.29 % 2.04 4 1 81 H07+4.07 0.25" 100 % 76.48% 1.92 3 1 89 H07+3.60 0.23" 92 % 53.09 % 1.04 4 1 80 H07+2.93 0.16" 100% 83.06 % 0.97 3 1 90 H07+10.45 0.22" 70% 47.23 % 0.57 No indication exceeded the 0.714" structural screening criteria. However, SG1 R1 C39 exceeded the first screening criteria for leakage and with a maximum depth of 90%, it was taken to the third step of screening for in situ testing. Since the length at maximum depth was less 0.1" and since this indication is bound by I past successful in situ pressure testing of Row 1 U-Bend indications, this indication was not considered a challenge to leakage integrity and was not in situ pressure tested.

Past in Situ Tests on U-Bend Axial PWSCC SG Row Column Location Length Max Avg Max Leakage Leakage Depth Depth Volts at SLB at 3dP (gpm) (gpm) 3 1 36 H07+10.26 0.75" 65% 51 % 1.94 0 0 4 1 84 H07+11.24 0.99" 96 % 74.4 % 5.35 0.079 0.43 2 1 61 H07+3.78 0.36" 100 % 80.9 % 3.21 0 0 Condition Monitorina for U-Bend PWSCC The limitirig U-Bend axial PWSCC indication for condition monitoring is SG 1 R1 C39. A bounding tube in situ tested end-of-cycle (EOC)-8 did not rupture at the 4750 psi pressure test, and leaked at SLB 0.079 gpm at room temperature.

Conservatively, this leakage is added to the total predicted accident-induced leakage for 4 of the 5 U-Bend indications, which is a total of 0.316. This is the only other potential contribution to SLB leakage results from the ARC for ODSCC at TSP intersections. Consequently, the total SLB leak rate at EOC-9 is negligible compared to the allowable limit, and the U-Bend PWSCC indications satisfy tube integrity requirements for condition monitoring.

The circumferential U-Bend PWSCC met condition monitoring performance criteria.

Operational Assessment for U-Bend PWSCC For axial U-Bend PWSCC, using the word nrowth from the last three outages at Sequoyah determined by the largest growth nJnus the smallest detected flaw, the largest growth in length is 0.33". Using tha smallest indication detected in the EOC-9 inspection, 0.16", the worst SQN growth rate,0.33", and the sizing lisglsqnluic9/ntc 90 day rpt 8

uncertainty from ETSS 96703,0.13", an indication left undetected BOC-10 would grow to 0.62" axial length, which is less than the 0.714" structural length criteria.

Assuming the undetected crack grew to 100% this indication would not challenge structural integrity. The largest voltage growth was 2.04 volts. With detection capabilities as low as 0.57 volts EOC-9, a missed indication could grow to 2.61 volts. Assuming the undetected crack grew to 100%, this indication would be bound by prior in situ testing and would not compromise leakage integrity. Typical PWSCC indications at U-Bends at SON are short (less than 0.5") with one point at maximum depth. Typical average depths are less than 60% and voltages are less than 2 volts.

For circumferential U-Bend PWSCC, the worst SON crack angle growth rate is 38 . Using the smallest detected circumferential indication EOC-9 as detection capability (38 ), and sizing uncertainties from ETSS 96702,21.02 , an indication left undetected BOC-10 would only grow to 97 . Assuming the undetected crack grew to 100% max depth, this indication would still meet condition monitoring structural performance criteria. The largest voltage growth was 0.58 volts. With detection capabilities as low as .58 volts EOC-9, a missed indication could grow to 1.16 volts, which is below the screening criteria for leakage. Therefore, all circumferential U-Bend indications found at EOC-10 will also satisfy leakage condition monitoring performance criteria.

The U-Bend inspection at EOC-9 included 100% of Row 1 and 2 U-Bends with a magnetic bias plus point probe. Given the 100% RPC inspection at EOC-9, the potential undetected indications left in service for Cycle 10 can be expected to be equal to or smaller than that for Cycle 9. Since operating conditions are essentially the same between Cycles 9 and 10 and all EOC-9 indications satisfied tube integrity requirements, it can be expected that all U-Bend indications found at EOC-10 will also satisfy performance criteria.

PWSCC TTS Twenty-five tubes were predicted to be plugged for PWSCC at TTS based on SON and industry experience. Thirty-two PWSCC indications were identified during this inspection. Fifty-five were identified during the U1C8 inspection.

These indications are primarily in the central region of the tube bundle as predicted for WEXTEX cracking.

Twenty-three indications were identified as circumferential PWSCC at TTS. The longest and bounding circumferential crack was 56 in SG4 R13 C46, which is well below the 223 structural screening criteria. The largest maximum voltage was in SG4 R13 C46,1.43 volts, which is below the 1.5 volt leakage screening criteria. Therefore, no TTS PWSCC circumferential indications challenge structural or leakage integrity. All circumferential cracks were compared to stabilization criteria, and one PWSCC TTS exceeded the criteria because of its location in the bundle, SG1 R35 C77, and this tube was stabilized.

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A total of 9 indications were identified as axial PWSCC at TTS. The largest and bounding indication was 0.36", which is below the freespan structural screening criteria. Only one axial indication exceeded the 2 volt screening criteria for leakage integrity and was located at the top of the tubesheet at HTS-0.19. SG3 R12 C48 had an axial PWSCC indication at 2.3 volts. This indication had a maximum depth of 96% and a 69.10% average depth. However, since the length at maximum depth was less than 0.1" and since it was bound by past in situ pressure test, no in situ testing was done.

Past in Situ Tests on TTS Axial PWSCC SG Row Column Location Length Max Avg Max Leakage Leakage Depth Depth Volts at SLB at 3dP (gpm) (gpm) 4 7 17 HTS-0.15 0.32" 100 % 56.5 % 3.55 0 0 Condition Monitorina for TTS PWSCC The limiting TTS axial PWSCC indication for condition monitoring is SG 3 R12 C48. A bounding tube in situ tested did not rupture or leak at the 4750 psi pressure test. Therefore, all PWSCC indications at the top of the tubesheet met structural and leakage condition monitoring performance criteria.

All circumferential TTS PWSCC met condition monitoring performance criteria.

Operational Assessment for TTS PWSCC The growth rate study performed during the past three SON outages indicates that the worst growth for axial PWSCC at TTS is 0.17" Using the smallest indication detected EOC-9 inspection (0.09") and the sizing uncertainty from ETSS 96703 of 0.13", an indication left undetected BOC-10 would only grow to 0.39". Assuming the indication grew to 100% maximum depth, this indication would still not challenge structural integrity. The worst maximum voltage growth i from SON growth data is 0.89 volts. Using the smallest voltage indication !

detected EOC-9 (0.39) as the detection threshhold, an indication would grow to 1.28 volts, which would not challenge leakage integrity even if the indication was 100% through wall.

The growth rate study performed during the past three SON outages indicates that worst growth for circumferential PWSCC at TTS is 13* Using the smallest detected circumferential indication from U1C9 as detection capability (24 ) and the sizing uncertainty from ETSS 96702 (21.02 ), an indication left undetected BOC-10 would only grow to 58 Assuming the indication grew to 100% through wall, this indication would still not challenge structural integrity. The worst maximum voltage growth from SON growth data is 0.35 volts. Using the smallest voltage indication detected EOC-9 (0.15 volts) as the detection threshold, an 1/sglsqnlutc8/ntc .90 day rpt 10

., l indication left undetected BOC-10 would grow to 0.5 volts, which would not challenge leakage integrity and would be consistent with EOC-9 data.

The PWSCC TTS indications from EOC-9 inspection met tube integrity )

requirements for condition monitoring, and since operation cycle and conditions I 1

will be essentially the same for Cycle 10 and given the 100% inspection, it is again expected that any axial PWSCC TTS indication identified EOC-10 will meet tube integrity requirements. )

ODSCC TTS Although SON unit 1 has had low occurrence of ODSCC at TTS, based on industry experience, this mechanism was predicted this cycle and 100%

examination at the hot TTS was performed.

Axial ODSCC was detected in one tube at TTS. The indication was well below the 0.465" length criteria for structural integrity and well below the 1.5 volt criteria for leakage integrity.

Three indications were identified as ODSCC circumferential. All were below the 223 screening criteria for structuralintegrity. One of the OCSCC circumferential indications exceeded the 1 volt screening criteria for leakage.

SG 1 R26 C41 at HTS .04. The circumferential indication was 55 ,95%

maximum depth, and 59% average depth. Because the maximum depth was greater than the screening criteria values, this indication was taken to the third step of screening and the maximum depth value was not continuous over a 20 arc. This indication was not a leakage concern. Since this indication was the bounding indication and it did not exceed screening criteria, no structural or leakage concerns exist. All circumferential indications were compared to stabilization criteria, and one tube was stabilized.

Condition Monitorina for TTS ODSCC The ODSCC indications identified in the WEXTEX transition do not challenge structural or leakage integrity for EOC-9; therefore, all indications met condition monitoring performance criteria.

Operational Assessment for TTS ODSCC Growth data is only available from the U1C9 outage. The only axial ODSCC at TTS had no growth. The largest growth rate of circumferential ODSCC at TTS from U1C9 was 24 Using the smallest detected circumferential indication from U1C9 as detection capability (44 ) and a sizing uncertainty of 20 , an indication ,

left undetected 80C-10 would grow to 88 . Assuming the indication grew to 100% through wall, this indication would still not challenge structural integrity.

The worst maximum voltage growth from SON growth data is 0.08 volts. Using 1/sglsqntuic9/nrc 90 day rpt 11 1

'4 the smallest voltage indication detected EOC-9 (0.28 volts) as the detection threshold, an indication left undetected BOC-10 would grow to 0.36 volts, which would not challenge leakage.

Given the 100% TTS + Point inspection at EOC-9, the potential undetected indications left in service for Cycle 10 can be expected to be equal to or smaller than that for Cycle 9. Since operating conditions are essentially the same between Cycles 9 and 10 and all EOC-9 indications satisfied condition monitoring requirements, it can be expected that all ODSCC TTS indications at EOC-10 will also satisfy condition monitoring performance criteria.

PWSCC TSP Degradation assessment predictions for axial PWSCC at dented TSPs were I higher than actual results. Based on SQN's experience during EOC-8 where the incidence of axial PWSCC at dented intersections increased by a factor of four, 219 tubes were projected to be identified with axial PWSCC and 68 were predicted with circumferential PWSCC. Because of the number of dented intersections and the occurrence of PWSCC in these intersections, this is predicted to be the life-limiting damage mechanism.

Prior to the U1C9 outage, TVA, PG&E, and Westinghouse developed a qualified sizing technique for axial PWSCC at dented TSPs. The results of this qualification project were reviewed by the NRC staff, who agreed that the technique met the intent of qualification for sizing per Draft Regulatory Guide 1074. Based on this qualification, indications identified during the EOC-9 I outage were sized, and if less than 40% maximum depth, were left in service.

l A total of 123 axial PWSCC indications were detected.

Disposition Number of Indications Number of Tubes l Left in Service due to 54 51 MD<40%

Plugged due to 3 3 additional damage mechanism in same tube Plugged conservatively 18 10 Plugged due to MD>40% 48 46 A total of 51 tubes were left in service sized as less than 40% maximum depth.

Table 3 is a listing of these indications sorted by maximum depth. Since all laboratory burst and leak testing was done freespan, cracks did not have to be totally inside the support plate to be left in service. The longest indication left in service that extended outside the support plate was in SG4 R5 C16. It began 0.06" above the center of the support plate and grew out of the top of the support 1

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. 1 plet3 by 0.265 inch:s. This tuba was no thrst to structural or leakage integrity because it was only 35.68% maximum depth and 22.87% average depth. l l

The following axial TSP PWSCC indications exceeded the .465" screening l criteria. However none of them exceeded the second step maximum depth screening criteria of 63%. Therefore none were a challenge to structural integrity.

SG Row Column Location Length Max Average Max Disposition Depth Depth Volts 3 10 40 H01.14 0.63" 38.48 % 31.08 % 1.34 in Service I 3 11 74 H01.51 1.19" 45.95 % 30.34 % 2.02 Plugged {

3 16 50 H01.21 0.47" 37.55 % 26.65% 1.25 in Service 3 24 80 H01.19 0.54" 40.35% 24.02 % 1.09 Plugged 4 3 47 H03.05 0.47 34.75 % 24.21 % 0.88 in Service 4 5 16 H01 +.06 0.59 35.68 % 22.87 0.56 in Service 4 31 18 H01.33 0.57" 57.14 % 41.34 % 1.18 Plugged Two indications exceeded the 2 volt screening criteria for leakage. However, neither of them exceeded the second step maximum depth screening criteria of 80% maximum depth. Therefore none were a challenge to leakage integrity.

SG Row Column Location Length Max Average Max or Angle Depth Depth Volts 3 10 36 H01.06 0.45" 45.95% 33.14 % 2.1 3 11 74 H01.51 1.19" 45.95 % 30.34 % 2.02 Table 4 is a listing of the axial PWSCC at dented TSP indications that were removed from service.

A total of 14 circumferential PWSCC indications were detected and all were i below the 223 structural screening limit. One indication exceeded the 1.5 volt screening criteria for leakage; however since maximum depth was only 48%, this indication was not considered a challenge to leakage integrity. All circumferential PWSCC indications were compared to stabilization criteria, and 4 tubes required stabilization due to their location in the bundle.

Condition Monitorino for TSP PWSCC All indications that exceeded the 40% maximum depth repair limit were taken out of service. All indications met condition monitoring performance criteria.

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Operationel Assessment of TSP PWSCC Adequate detection of circumferential indications at dented TSPs is supported by prior tube pulls at SON Unit 1 and at Diablo Canyon Unit 1. The + Point inspection at EOC-9 of dented TSP intersections was slightly more extensive than that performed at EOC-8. All indications at dented TSP intersections satisfied burst and leakage requirements at EOC-9 and can be expected to ,

satisfy requirements at EOC-10.

Acceptable tube integrity at EOC-10 can also be obtained from considerations of

+ Point detection thresholds and uncertainties and growth rates obtained during l the eddy current qualification program. An estimate of the + Point detection threshold for PWSCC at dented TSP intersections can be obtained as the smallest pulled tube indication that was detected in the field inspection. From Westinghouse _ Report SG 97-02-007, the smallest pulled tube indication had a crack length of 0.12", a maximum depth of 38%, and an average depth of 23%.

Growth rates were developed at a 95% confidence during the qualification of l NDE techniques: length - 0.24"/ cycle, maximum depth - 25.1 %/ cycle, and j average depth - 21.5%/ cycle. NDE uncertainties were also developed at a 95% )

confidence: length - 0.25", maximum depth - 19.2%, average depth - 10.1 %.

With this information, the worse case flaw that could be predicted to have been left in service BOC-10 would grow to 0.61",82.3% maximum depth, and 54.6%

average depth. j Structural limits for Axial PWSCC at dented TSP were also developed during the TVA/PG&E/ Westinghouse program. The structural limit is 61.5% average depth for a 0.5" flaw at 3dP, which assumes the whole crack is freespan. At SLB conditions the structural limit is 62.1% for a 1.4" flaw. Since the worse case flaw would only be predicted to be 54.6% average depth, this indication would not challenge structural integrity. It should also be noted that the growth rates used in this evaluation are very conservative. Typical growth rates seen in the field are less than 0.1" per cycle and less than 10% average depth per cycle.

The worse case indication from the above evaluation would only be 81.58%

- maximum depth, which would not indicate a leakage concern.

The following tubes were in situ tested during U1C8 inspection. None failed or leaked at 3dP pressures. SG4 R36 C42 with two axial cracks clearly bounds the worse case indication at EOC-9 or predicted for EOC-10.

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N SG Row QAsm Plaw Flaw Onsteon ho AD Asial Ingh Mn leday at Ienqpat Irrmmri Type. Ingh Osi& Wits S.Bgun 3& gun TSP RFC 3 73 H)l+0.6- PWSOC Axial WA $694 0.43" 0.43" 3.11 0 0 3 16 67 H)lo.23 PWSOC 2 Axials 62 % 41.2 % 0.45 2.14 0 0 4r4 27.1 % 0.21" 0.58 0 0 3 16 83 H)l4.58 PWSOC 3 Axials - 6P4 #P4 0.31" 0.72 0 0 22 % 13.7 4 0.lT 0.92 0 0 6(P4 47.74 0.2tT' 2.02 0 0 3 30 71 H124.45 PWST Axial 54 % 34.74 0.5ff' 2 13 0 0 4- 1 21 H124.27 PWSOC Axial 61% - 31.94 0.53" 0.79 0 0 4 3 45 H)l40.01 PWSOC Axial 474 30.&4 0.2T 1.07 0 0 4 6 31 H)l40.03 PWSOC Axial 42 % 29.&4 0.T 1.05 0 0 4 14 29 H12+0.04 PWSOC Axial 84 % 69.2 % 0.34 O.90 0 0 4 33 21 H)l40.0 PWST Axial W4- 30.94 0.27' O.38 0 0 4 36 42 M1240.61 PWST Axial G74 4R4% 0.4T 0.0C' l.36 0 0 91 % 71 1 % 0.31" 0.31" IM 0 0 4 37 : 28 H)l40.29 PWSOC Axial RTA M8% 0.87' O.lf 2.70 0 0 4 14 - 63 H1240.0 PWSOC Axial 494 31.74 0.21" 0.40 0 0 4 14 63 M1240.0 ffNnr Axial 874 61 8 % 0 51" 0.56 0 0 All predicted Axial PWSCC at TSP will meet condition monitoring performance criteria at the EOC-10.

ODSCC TSP-SON unit 1 experience with circumferential ODSCC associated with TSP dents was projected to increase this outage based on industry experience. Thirty-eight tubes were predicted to be plugged for this. damage mechanism.

A total of 21 circumferential ODSCC indications were detected at dented TSP

. intersections. The longest circumferental crack was 104 (SG2 R16 C33), which is below the 223 screening criteria for structural integrity. One tube exceeded the 1 volt screening criteria for leakage (SG1 R7 C47); however, maximum depth was only 20%, therefore, this indication did not challenge leakage integrity.

. A total ~of 376 axial ODSCC indications were detected in non-dented intersections during the Unit 1 Cycle 9 outage. Generic Letter 95-05 ARC implementation continued in non-dented tubes and 370 tubes were left in service based on application of ARC. j A total of 2 tubes were plugged with ODSCC indications at dented intersections greater than 5 volts,4 tubes were plugged with ID and OD axial indications in l the same support plate, and 3 tubes were plugged for other damage mechanisms. One tube was pulled. A detailed report containing the 90-day reporting criteria for ARC was issued 90 days after completion of the steam generator inspection.

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AVB Wear Based on past indications and growth rate data from past outages, one tube was predicted to be plugged for AVB wear. A total of 66 indications were detected with only one tube plugged; SG3 R35 C41 with a 42% through wall indication at AV3+0.00.

Cold Leo Wastaae Two tubes were predicted to be plugged for cold leg wastage. A total of 37 indications were detected with no indications exceeding the plugging limit of

-40% through wall.

Other Fluaced Tubes Two tubes were preventively plugged in SG3 due to bulges at the top of the tubesheet. One tube was preventively plugged in SG2 due to a partial tubesheet expansion.

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SECONDARY SIDE INSPECTION SCOPE AND RESULTS Cracked Suocort Plate Indications Cracked tube support plate indications (CSis) are indications of cracks in the tube support plates and not necessarily indicative of tube degradation. A total of j 34 tubes were reported with CSis. There were 9 in SG1,9 in SG2,10 in SG3 and 6 in SG4. These were detected during an automated analysis of bobbin

)

data. All indications were tested with plus point probe.

4 SON unit 1 steam generators do not have extensive support plate cracking.

Therefore, design basis function of the support plate has not been lost. There is also no evidence of wrapper drop or wrapper degradation.

Upper Internals inspection An upper internals inspection was performed on two steam generators and no degradation was detected.

Sludae Lancina Sludge lancing was performed on all four steam generators: 61.5 pounds of sludge was removed from SG1,85 pounds from SG2,88.5 pounds from SG3, and 73 pounds from SG4. A post-lance inspection confirmed that the top of the tubesheet on all generators was clean.

Foreian Object Search and Retrieval (FOSAR)

Foreign object search and retrieval was completed on all four steam generators and all identified foreign objects were retrieved.

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I CONCLUSIONS ,

1 The NDE testing completed on the SON Unit 1 SGs and plugging of defective tubes met the Technical Specification and ASME Section XI code requirements for inservice inspection; therefore, each SG has been demonstrated operable. l Alternate Repair Criteria was implemented in accordance with the Unit 1 Technical Specification License Condition 2.C(9)(d). !

Based on the criteria of 10 CFR 50.59 and utilizing the criteria of Draft Regulatory Guide 1.121, TVA concludes that the integrity of the SON Unit 1 SGs

- was maintained during Cycle 9 operation and will be maintained through full Cycle 10 and does not represent an unreviewed safety question.

l l

Ilsglsqntuics/nrc 90 day rpt 18

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Tcbla 1

SUMMARY

OF SEQUOYAH UNIT 1 CYCLE 9 SG EDDY CURRENT INSPECTION / TUBE PLUGGING RESULTS EDDY CURRENT EXAM TYPE SG 1 SG 2 SG 3 SG4 Full Length Bobbin Coil 3311 3284 3183 3149 U-Bend Plus Point 176 176 146 155 Top of Tubesheet 3panc RPC 3311 3284 3183 3149 H01 Plus Point 375 62 867 1529 H02 Plus Point 105 111 823 760 H03 Plus Point 18 4 429 1212 H04 Plus Point 1 0 977 598 H05 Plus Point 0 0 21 ~40 H06 Plus Point 2 1 163 0 H07 Plus Point . 15 12 7 2 HL Additional TSP Plus Point & 3 Coil 84 - 60 138 147 CL RPC (ALL) 9 7 10 1 Dented Freespan HL Plus Point 18 20 10 17 Total Exams Completed 7425 7021 9957 10759 Total Tubes Examined 3311 3284 3183 3149 INDICATIONS (Tubes) SG 1 SG 2 SG 3 SG 4 AVB WEAR 3 11 15 8

' BULGE O 0 1 0 CL WASTAGE 19 8 8 1 COPPER 5 1 0 0 DISTORTED BOBBIN SIGNAL (RRC) 3 3 24 11 Pi BOBBIN CALL 102 117 81 52 ODSCC HTS AXIAL 0 1 0 0 ODSCC HTS CIRC 1 2 0 0 ODSCC TSP AXIAL 16 15 43 27 ODSCC TSP CIRC 2 1 4 11 OVER EXPANSION TTS 0 0 1 0 PARTIAL TS EXPANSION . 4 1 0 0 POTENTIAL LOOSE PART 0 15 9 1 PWSCC HTS AXIAL - 2 1 3 3 PWSCC HTS CIRC 1 12 3 5 PWSCC TSP AXIAL 6 4 67 29 PWSCC TSP CIRC ' 0 0 9 3 PWSCC U-BEND AXIAL 1 0 2 2 PWSCC U-BEND CIRC 0 0 0 1

. SLUDGE O O O O TSP CRACK 9 9 10 6 Total 174 201 280 160

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SUMMARY

OF SEOUOYAH UNIT 1 CYCLE 9 SG EDDY CURRENT INSPECTION / TUBE PLUGGING RESULTS PLUGGING STATUS SG1 SG 2 SG 3 SG4 Previously Plugged Tubes 77 104 205 239 Plugged Cycle 9 10 23 55 42 Damage Mechanism AVB WEAR 0 0 1 0 LOOSE PART 0 0 0 0 ODSCC HTS 1 3 0 0 ODSCC TSP 2 2 5 12 ODSCC U-BEND 0 0 0 0 PREVENTATIVE O 1 2 0 PWSCC HTS 3 13 6 8 PVVSCC TSP 3 4 39 19 PWSCC U-BEND 1 0 2 3 TOTAL TUBES PLUGGED 87 127 260 281 l

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Table 2 I Resolution of Defective Tubes and All Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 l

SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION l Sample: 0 39 SAI H07+10.57 PWSCC UBEND AXIAL PLUG 1 1

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1 2 52 SAI HTS.29 PWSCC HTS AXIAL PLUG I 1 2 85 Pl H01.03 ODSCC TSP AXIAL (1) 1 2 91 Pl H01+.29 ODSCC TSP AXIAL (1) 1 2 91 Pl H02.29 ODSCC TSP AXIAL (1) 1 3 41 12 C01 +.00 C/L WASTAGE (1) 1 3 59 sal H01 +.51 PWSCC > Sv DNT AXIAL PLUG !

1 4 54 sal HTS-2.01 PWSCC HTS AXlAL PLUG 1 4 60 PI H07.09 ODSCC TSP AXIAL (1) 1 4 70 Pl H06+.06 ODSCC TSP AX1AL (1) 1 4 87 Pl H01 +.03 ODSCC TSP AXIAL (1) 1 5 1 PI C07+.06 ODSCC TSP AXlAL (1) 1 5 51 Pl C06+.09 ODSCC TSP AXIAL (1) 1 5 55 PI H01 +.03 ODSCC TSP AXIAL (1) 1 5 57 Pl H01 +.12 ODSCC TSP AXIAL (1) 1 6 1 Pi C06.03 ODSCC TSP AXIAL (1) 1 6 27 PI H01.06 ODSCC TSP AXIAL (1) 1 6 31 PI H02+.03 ODSCC TSP AXIAL (1) 1 6 50 Pl C03+.11 ODSCC TSP AXIAL (1) 1 6 57 Pl H01.06 ODSCC TSP AXIAL (1) 1 7 27 Pl C03.03 ODSCC TSP AXIAL (1) 1 7 47 SCI H01 +.00 ODSCC TSP CIRC PLUG 1 7 65 PI H01 +.03 ODSCC TSP AXIAL (1) 1 7 65 PI H02+.00 ODSCC TSP AXIAL (1) 1 7 94 Pl H01 +.06 ODSCC TSP AXIAL (1) 1 7 94 Pl H02.35 ODSCC TSP AXIAL (1) 1 8 2 20 C01 +.06 C/L WASTAGE (1) 1 8 2 23 C02+.09 C/L WASTAGE (1)

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Resolution of Defective Tubes and All Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL JN_D LOCATION CHARACTERIZATION RESOLUTION 1 8 6 36 C04+.00 C/L WASTAGE (1) 1 8 26 Pl H01 +.03 ODSCC TSP AXIAL (1) 1 8 46 Pl H07+.18 ODSCC TSP AXIAL (1) 1 8 46 Pl . H07+.26 ODSCC TSP AXfAL (1) 1 8 63 Pl H01 +.03 ODSCC TSP AXtAL (1) 1 8 65 PI H01.03 ODSCC TSP AXtAL (1) 1 8 65 Pl H02+.00 ODSCC TSP AXIAL (1) 1 8 66 Pl H01 +.12 ODSCC TSP AXIAL (1) 1 8 69 PI H02+.15 ODSCC TSP AXIAL (1) ,

1 9 2 SCI H01 +.01 ODSCC TSP CIRC PLUG / STABILIZE j 1 9 11 PI H02+.00 ODSCC TSP AXIAL (1) 1 9 39 Pl C03.03 ODSCC TSP AXIAL (1) 1 9 61 Pl H07+.06 ODSCC TSP AXIAL (1) 1 9 66 Pl H01 +.03 ODSCC TSP AXIAL (1) 1 9 66 Pl H02+.00 ODSCC TSP AXIAL (1) 1 10 49 Pl H01 +.06 ODSCC TSP AXIAL (1) 1 10 51 Pl H01 +.00 ODSCC TSP AXlAL (1) 1 10 53 PI H01.15 ODSCC TSP AXtAL (1) 1 10 66 Pl H01 +.17 ODSCC TSP AX1AL (1) 1 10 78 Pl C01.03 ODSCC TSP AXIAL (1) 1 10 91 Pl H01.03 ODSCC TSP AXIAL (1) 1 10 92 Pl H01 +.12 ODSCC TSP AXIAL (1) 1 11 5 11 CO2.09 C/L WASTAGE (1) 1 11 32 Pl H01 +.14 ODSCC TSP AXIAL (1) 1 11 57 Pl H01 +.00 ODSCC TSP AXIAL (1) l 1 11 84 PI H01.03 ODSCC TSP AXIAL (1) 1 11 91 Pl H02.09 ODSCC TSP AX1AL (1) 1 12 36 Pi C03.09 ODSCC TSP AXIAL (1) 1 12 55 20 H01 +.20 PWSCC 2-5v DNT AXIAL (1) 2

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's Resolution of Defective Tubes and All Service-induced Wall Loss Indications l

SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 1 14 6 Pl C06+.06 ODSCC TSP AXIAL (1) 1 15 39 Pl C03.06 ODSCC TSP AX1AL (1) i 1 15 84 Pl H01 +.00 ODSCC TSP AXIAL (1) 1 16 78 Pl C05.03 ODSCC TSP AXIAL (1) 1 16 89 Pl H04+.12 ODSCC TSP AXIAL (1) 1 17 26 Pi C06.03 ODSCC TSP AXIAL (1) 1 17 55 sal H01 +.58 PWSCC > Sv DNT AXIAL PLUG 1 17 85 Pl H01.06 ODSCC TSP AXIAL (1) 1 17 90 PI H01.03 ODSCC TSP AXIAL (1) 1 18 71 Pt H06+.00 ODSCC TSP AXIAL (1) 1 18 86 PI H03+.12 ODSCC TSP AXIAL (1) 1 19 16 Pl H04.03 ODSCC TSP AXIAL (1) 1 20 29 Pi C05.09 ODSCC TSP AXIAL (1) 1 20 66 39 H02+.03 PWSCC 2-Sv DNT AXIAL (1) 1 20 68 Pl H01 +.03 ODSCC TSP AXIAL (1) 1 20 70 Pl H01.03 ODSCC TSP AXtAL (1) 1 21 27 PI H02+.00 ODSCC TSP AXIAL (1) 1 21 54 PI H01.06 ODSCC TSP AXIAL (1) 1 21 76 Pl H01 +.14 ODSCC TSP AXIAL (1) 1 21 81 Pl H01 +.12 ODSCC TSP AXIAL (1) 1 21 86 Pl H01 +.15 ODSCC TSP AXIAL (1) 1 21 87 7 C04.09 C/L WASTAGE (1) 1 21 89 Pl H01.03 ODSCC TSP AXIAL (1) 1 22 65 Pl H01 +.17 ODSCC TSP AXIAL (1) 1 23 7 20 C04.09 C/L WASTAGE (1) 1 23 45 27 AV1.06 AVB WEAR (1) 1 23 45 32 AV3+.00 AVB WEAR (1) 1 23 46 Pl C04+.03 ODSCC TSP AXIAL (1) 1 23 88 SAI H01 +.00 PWSCC < 2v DNT AXIAL PLUG 3

s Resolution of Defective Tubes and All Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 1 24 85 Pl H01 +.09 ODSCC TSP AXIAL (1) 1 25 74 PI H01 +.06 ODSCC TSP AXIAL (1) 1 26 37 Pl H01 +.21 ODSCC TSP AXIAL (1) 1 26 41 SCI HTS .04 ODSCC HTS CIRC PLUG 1 26 58 38 H01.16 PWSCC < 2v DNT AXtAL (1) 1 26 79 Pl H01 +.06 ODSCC TSP AXtAL (1) 1 27 80 Pl C01.03 ODSCC TSP AXIAL (1) 1 27 80 PI H01 +.06 ODSCC TSP AXIAL (1) 1 28 46 18 AV2+.00 AVB WEAR (1) 1 1 28 46 21 AV3+.00 AVB WEAR (1) l 1 28 46 Pl H01.03 ODSCC TSP AXIAL (1) 1 28 50 26 AV1 +.00 AVB WEAR (1) 1 1 28 50 36 AV2+.00 AVB WEAR (1) !

1 29 13 Pl H06.03 ODSCC TSP AXIAL (1) 1 29 66 PI H01.06 ODSCC TSP AXIAL (1) 1 29 75 PI H03+.00 ODSCC TSP AXIAL (1) 1 29 78 Pl H01 +.12 ODSCC TSP AXIAL (1) 1 29 81 Pl H01.03 ODSCC TSP AXIAL (1) 1 30 14 PI H06+.12 ODSCC TSP AXIAL (1) 1 30 16 Pl H06+.12 ODSCC TSP AXIAL (1) 1 30 77 PI H02+.12 ODSCC TSP AXIAL (1) 1 31 14 Pl H06.12 ODSCC TSP AXIAL (1) 1 32 16 18 C01 +.09 C/L WASTAGE (1) 1 32 16 Pl H05+.03 ODSCC TSP AXfAL (1) 1 32 16 PI H06+.12 ODSCC TSP AXIAL (1) 1 32 74 Pl C07+.00 ODSCC TSP AXIAL (1) 1 33 17 H H05.03 ODSCC TSP AXIAL (1) 1 33 17 PI H06+.06 ODSCC TSP AXIAL (1) 1 33 74 Pl H01.06 ODSCC TSP AXtAL (1) 4

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Resolution of Defective Tubes and All Service-Induced Wall Loss indications l SQN Unit 1 Cycle 9 Date: OMlay-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 1 34 16 34 C01 +.09 C/L WASTAGE (1) 1 34 16 Pl H04 +.09 ODSCC TSP AXIAL (1) 1 34 17 Pl H05+.06 ODSCC TSP AXIAL (1) 1 34 74 Pl H01 +.03 ODSCC TSP AXIAL (1)

1 35 17 22 C01.20 C/L WASTAGE (1) l 1 35 77 SCI HTS +.00 PWSCC HTS CIRC PLUG / STABILIZE 1 35 78 PI H02+.18 ODSCC TSP AXIAL (1) 1 36 18 22 C01 +.09 C/L WASTAGE (1) l 1 36 47 PI H03+.09 ODSCC TSP AXIAL (1) 1 37 20 6 C01.12 C/L WASTAGE (1) l 1 37 70 Pl H01 +.03 ODSCC TSP AXIAL (1) 1 37 74 5 C04+.00 C/L WASTAGE (1) 1 38 30 Pl H01.06 ODSCC TSP AXtAL (1) 1 38 55 P' H03+.09 ODSCC TSP AXIAL (1) 1 39 72 Pl H03+.12 ODSCC TSP AXIAL (1) 1 40 68 Pl C04.03 ODSCC TSP AX1AL (1) 1 41 35 Pl H03+.03 ODSCC TSP AXIAL (1) l 1 42 40 Pl H02+.09 ODSCC TSP AXIAL (1) 1 42 41 Pl H03.06 ODSCC TSP AXIAL (1) 1 42 60 Pl H02+.09 ODSCC TSP AX1AL (1) 1 42 61 15 C01 +.06 C/L WASTAGE (1)

, 1 43 49 PI H04+.12 ODSCC TSP AXIAL (1) 1 1 43 59 16 C01.03 C/L WASTAGE (1) l 1 43 61 Pl H02.06 ODSCC TSP AXIAL (1) l 1 43 63 Pl H02.20 ODSCC TSP AXIAL (1) 1 44 35 36 C01 +.20 C/L WASTAGE (1) 1 44 38 PI H01 +.03 ODSCC TSP AXIAL (1) 1 44 60 3 C01 +.20 C/L WASTAGE (1) l 1 44 61 10 C01 +.00 C/L WASTAGE (1) l 5

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1 Resolution of Defective Tubes and All Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 1 44 61 Pl H05+.06 ODSCC TSP AXIAL (1) 1 44 62 19 C01 +.03 C/L WASTAGE (1) 1 45 46 Pl C05.09 ODSCC TSP AXIAL (1) 1 45 59 29 C01.12 C/L WASTAGE (1) 1 46 48 PI H03+.06 ODSCC TSP AXfAL (1) 1 46 54 PI H05+.12 ODSCC TSP AXIAL (1)

Bobbin inspection sample is category C-1 TTS RPC inspection sample is category C-2 Dented TSP + Point inspection sample is category C-2 U-Bend + Point inspection sample is category C-2 (1) Retest Future Outage l

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Resolution of Defective Tubes and All Service-Induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION Sample: 0 ,

2 2 11 Pl C04+.00 ODSCC TSP AXIAL (1) 2 2 12 Pl C04.09 ODSCC TSP AXIAL (1) ;

2 2 31 Pl H02.03 ODSCC TSP AXtAL (1) l 2 2 43 PI H01.03 ODSCC TSP AX1AL (1) 2 2 46 Pl H03.26 ODSCC TSP AXIAL (1) 2 2 49 Pl H01 +.06 ODSCC TSP AXIAL (1) 2 2 58 PI H01+.09 ODSCC TSP AX1AL (1) 2 2 65 Pi C03.03 ODSCC TSP AXIAL (1) 2 2 92 PTE HTS +.00 RESTRICTED TUBE PLUG PREVENTIVELY 2 3 1 PI C06.15 ODSCC TSP AXIAL (1) 2 3 13 Pl H01 +.09 ODSCC TSP AXIAL (1) 2 3 30 PI H05.09 ODSCC TSP AXIAL (1) 2 3 41 PI H01 +.15 ODSCC TSP AXIAL (1) 2 4 6 PI H01 +.09 ODSCC TSP AXIAL (1) 2 4 10 PI C06.09 ODSCC TSP AXIAL (1) 2 4 13 PI H01 +.03 ODSCC TSP AXlAL (1) 2 4 15 PI H01 +.03 ODSCC TSP AXIAL 2 4 15 Pl H02.06 ODSCC TSP AXIAL PULL / PLUG 2 4 30 Pl H01 +.09 ODSCC TSP AXtAL (1) 2 4 36 sal HTS +.15 ODSCC HTS AXIAL PLUG 2 4 83 Pl C03.03 ODSCC TSP AXIAL (1) 2 5 39 Pl H01 +.17 ODSCC TSP AXIAL (1) 2 5 61 17 C01 +.03 C/L WASTAGE (1) 2 5 68 11 C01 +.03 C/L WASTAGE (1)

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1 Resolution of Defective Tubes and All l Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 I

SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION i 1

2 6 43 Pl H01 +.03 ODSCC TSP AXIAL (1) 2 6 52 Pl H02.06 ODSCC TSP AXtAL (1) 2 6 59 Pl H01 +.03 ODSCC TSP AXtAL (1) 2 6 63 Pl H05+.06 ODSCC TSP AXIAL (1) 2 7 24 Pl H01 +.03 ODSCC TSP AXIAL (1) 2 7 41 Pl H07+.06 ODSCC TSP AXtAL (1) 2 7 53 Pl H01 +.06 ODSCC TSP AXtAL (1) i 2 7 63 Pl H07+.00 ODSCC TSP AXIAL (1) 2 7 66 Pl H01 +.03 ODSCC TSP AX1AL (1) 2 7 70 Pl H01 +.15 ODSCC TSP AX1AL (1) 2 8 32 sal H01 +.08 ODSCC TSP AXIAL 2 8 32 41 H01.17 PWSCC < 2v DNT AXtAL PLUG 2 8 88 Pl C04.06 ODSCC TSP AX1AL (1) 2 9 55 Pl H01.03 ODSCC TSP AXIAL (1) 2 10 4 Pl H01 +.00 ODSCC TSP AXIAL (1) 2 10 15 Pi H02.09 ODSCC TSP AX1AL (1) 2 10 25 SCI HTS.19 PWSCC HTS CIRC PLUG 2 10 34 36 H01 +.06 PWSCC 2-5v DNT AXIAL PLUG 2 10 89 Pl C06+.00 ODSCC TSP AXIAL (1) 2 10 89 Pl C07+.00 ODSCC TSP AXtAL (1) 2 11 25 SCI HTS.17 PWSCC HTS CIRC PLUG 2 11 34 Pl H01.23 ODSCC TSP AX1AL (1) 2 11 40 Pl C04.03 ODSCC TSP AXIAL (1) 2 11 56 Pl H01.09 ODSCC TSP AXIAL (1) 2 11 68 Pl H01 +.09 ODSCC TSP AX1AL (1) l L

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I Resolution of Defective Tubes and All Service-induced Wall Loss Indications I

SON Unit 1 Cycle 9 Date: 04-May-99 l

l SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 2 12 6 Pl H01 +.03 ODSCC TSP AXlAL (1) l 2 12 10 Pl H01+.00 ODSCC TSP AXtAL (1) 1 2 12 17 14 C06.06 C/L WASTAGE (1) 2 12 89 Pl C05+.00 ODSCC TSP AXIAL (1) 2 13 4 Pl C06.06 ODSCC TSP AXIAL (1) 2 13 4 Pl H02+.12 ODSCC TSP AXIAL (1) 2 13 4 Pl H03.03 ODSCC TSP AXlAL (1) 2 13 4 Pl H05+.00 ODSCC TSP AX1AL (1) 2 13 5 Pl H01 +.06 ODSCC TSP AXIAL (1) 2 13 5 PI H03.06 ODSCC TSP AXlAL (1) !

2 13 17 SCI HTS.12 PWSCC HTS CIRC PLUG 2 13 18 SCI HTS.14 PWSCC HTS CIRC PLUG ,

1 2 13 60 Pl H01 +.06 ODSCC TSP AXIAL (1) 2 13 89 Pl C05+.03 ODSCC TSP AXIAL (1) 2 14 6 Pl H01.12 'ODSCC TSP AXIAL (1) 2 14 6 Pl H05+.06 ODSCC TSP AXtAL (1) 2 14 9 Pl H01 +.03 ODSCC TSP AXIAL (1) 2 14 14 Pl H01.06 ODSCC TSP AXIAL (1) 2 14 33 56 H02.12 PWSCC < 2v DNT AXIAL PLUG 2 14 37 Pl H01.21 ODSCC TSP AXtAL (1) 2 15 12 PI H01+ 12 ODC'D TSP AXtAL (1) 2 15 29 Pl H01.20 ODSCC TSP AX1AL 2 15 29 SCI HTS.10 PWSCC HTS CIRC PLUG 2 16 9 Pl H01.06 ODSCC TSP AXIAL (1) 2 16 10 Pl H01+.09 ODSCC TSP AXIAL (1) 3

Resolution of Defective Tubes and All Service-Induced Wall Loss indications SQN Unit 1 Cycle 9 Date: 04-May-99 S_G ROVY COL IND LOCATION CHARACTERIZATION RESOLUTION 2 16 24 Pl H07+.06 ODSCC TSP AXIAL (1) 2 16 33 MCI H02+.12 ODSCC TSP CIRC PLUG / STABILIZE 2 16 33 MCI H02+.17 ODSCC TSP CIRC 2 16 44 Pl H01 +.18 ODSCC TSP AXIAL (1) 2 16 53 SCI HTS.07 PWSCC HTS CIRC PLUG 2 16 78 SAI HTS-2.74 PWSCC HTS AXIAL PLUG 2 17 19 Pl H03.06 ODSCC TSP AXIAL (1) 2 17 30 SCI HTS.11 PWSCC HTS CIRC PLUG 2 17 35 Pl H02.15 ODSCC TSP AXIAL (1) 2 17 60 Pl H01 +.21 ODSCC TSP AXIAL (1) 2 17 61 Pl C03.06 ODSCC TSP AXIAL (1) 2 18 22 Pl H01.15 ODSCC TSP AXIAL (1) 2 18 30 59 H01.17 PWSCC < 2v DNT AXIAL PLUG 2 19 24 SQ HTS.08 PWSCC HTS CIRC PLUG l 2 20 30 15 AV4+.00 AVB WEAR (1) 2 20 30 PI H05.03 ODSCC TSP AXIAL (1) 2 20 31 PI H03.06 ODSCC TSP AXlAL (1) 2 20 53 Pl H01 +.12 ODSCC TSP AXIAL (1) 2 20 54 PI H01 +.15 ODSCC TSP AXIAL (1) 2 20 55 P1 H01 +.12 ODSCC TSP AXIAL (1) 2 21 13 15 C05.06 C/L WAST /.GE (1) 2 21 76 Pl H02.03 ODSCC TSP AXIAL (1) 2 22 12 PI H01.06 ODSCC TSP AXIAL (1) 2 22 34 SCI HTS +.04 ODSCC HTS CIRC PLUG / STABILIZE 2 22 34 SCI HTS.15 ODSCC HTS CIRC 4 l t j

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1 Resolution of Defective Tubes and All Service-induced Wall Loss Indications SQN Unit i Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CllARACTERIZATION RESOLUTION 2 22 36 21 AV3+.15 AVB WEAR (1) 2 22 37 20 AV2+.00 /.VB WEAR (1) 2 22 37 18 AV3 +.00 AVB WEAR (1) 2 23 33 SCI HTS.03 PWSCC HTS CIRC PLUG l

2 24 12 Pl H01+.06 ODSCC TSP AXIAL (1) 2 25 65 SCI HTS.08 PWSCC HTS CIRC PLUG 2 25 83 Pl H07+.06 ODSCC TSP AX1AL (1) 2 26 9 Pl H01.06 ODSCC TSP AXIAL (1) 2 26 13 Pl H01.06 ODSCC TSP AXIAL (1) 2 26 27 SCI HTS.08 PWSCC HTS CIRC PLUG 2 26 50 SCI HTS.06 ODSCC HTS CIRC PLUG 2 26 51 Pl H01.03 ODSCC TSP AXIAL (1) 2 26 53 Pl H01 +.03 ODSCC TSP WAL (1) 2 26 59 Pl H01 +.12 ODSCC TSP AXIAL (1) 2 27 15 19 C05 .03 C/L WASTAGE (1) 2 27 40 16 AV1+.00 AVB WEAR (1) 2 27 40 24 AV2+.00 AVB WEAR (1) 2 27 40 18 AV3+.00 AVB WEAR (1) 2 27 76 Pl H02+.15 ODSCC TSP AXIAL (1) l 2 28 11 PI H01.20 ODSCC TSP AXIAL (1) 2 28 19 Pl H01 +.06 ODSCC TSP AX1AL (1) 2 29 17 Pl C06+.18 ODSCC TSP AXlAL (1) 2 29 28 Pl H01 +.06 ODSCC TSP AXIAL (1) l 2 29 30 PI H01.12 ODSCC TSP AXIAL (1) l 2 29 35 Pl H04.21 ODSCC TSP AXIAL (1) l l l l j 3

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. .. 1 Resolution of Defective Tubes and All Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTER!ZATION RESOLUTION 2 29 56 SCI HTS.13 PWSCC HTS CIRC PLUG 2 30 23 Pi H02.18 ODSCC TSP AXIAL (1) 2 31 14 PI F:02+.12 ODSCC TSP AXIAL (1) 2 31 45 PI C05+.00 ODSCC TSP AXIAL (1) 2 31 45 Pl C05+.03 ODSCC TSP AXIAL (1) 2 31 57 PI H01 +.17 ODSCC TSP AXIAL (1) 2 31 67 Pl H07+.00 ODSCC TSP AX1AL (1) 2 31 82 10 C01 +.00 C/L WASTAGE (1) 4 2 32 52 Pl H05+.09 ODSCC TSP AXIAL (1) 2 32 55 25 AV3+.09 AVB WEAR (1) 2 32 55 23 AV4.12 AVB WEAR (1) 2 32 56 Pl H05+.00 ODSCC TSP AXIAL (1) 2 33 40 Pl H06+.06 ODSCC TSP AXtAL (1) 2 33 49 34 AV1 +.00 AVB WEAR (1) 2 33 49 37 AV2+.00 AVB WEAR (1) 2 33 49 34 AV3+.00 AVB WEAR (1) 2 33 49 17 AV4+.00 AVB WEAR (1) 2 33 49 PI H01 +.12 ODSCC TSP AXIAL (1) 2 34 20 Pl C06+.00 ODSCC TSP AXtAL (1) 2 34 46 Pl H01 +.12 ODSCC TSP AXIAL (1) 2 34 48 Pl H01 +.15 ODSCC TSP AXIAL (1) 2 34 64 Pl H01 +.12 ODSCC TSP AXtAL (1) 2 34 76 Pl H01 +.06 ODSCC TSP AXfAL (1) 2 34 79 Pl H01 +.18 ODSCC TSP AXIAL (1) 2 35 18 Pl H01.03 ODSCC TSP AXIAL (1) 6

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Resolution of Defective Tubes and All Service-Induced Wall Loss Indications I SQN Unit 1 Cycle 9 Date: 04-May-99 l l

SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 2 35 18 Pl H02+.12 ODSCC TSP AXlAL (1) 2 35 20 Pl C06+.03 ODSCC TSP AXIAL (1) 2 36 19 Pl H01 +.06 ODSCC TSP AXlAL (1) 2 36 64 Pl H05+.03 ODSCC TSP AXIAL (1)

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2 36 67 Pl H03+.00 ODSCC TSP AXIAL (1) 2 36 73 Pl H07+.00 ODSCC TSP AXIAL (1) 2 37 41 Pi H02+.00 ODSCC TSP AXIAL (1) 2 38 34 Pl H01.06 ODSCC TSP AXIAL (1) 2 38 34 PI H03+.00 ODSCC TSP AXIAL (1) 2 38 45 19 AV3+.00 AVB WEAR (1) 2 38 46 29 AV3+.00 AVB WEAR (1) 2 38 47 29 AV3+.00 AVB WEAR (1) 2 38 48 23 AV3+.00 AVB WEAR (1) 2 38 49 28 AV2+.00 AVB WEAR (1) 2 38 49 18 AV3.29 AVB WEAR (1) 2 38 57 26 C05+.03 C/L WASTAGE (1) 2 39 28 PI H04.09 ODSCC TSP AXIAL (1) 2 40 39 Pl H01 +.09 ODSCC TSP AXIAL (1) l 2 41 52 PI H03+.15 ODSCC TSP AXIAL (1) 2 43 30 Pl H04.12 ODSCC TSP AX1AL (1) 2 43 30 Pl H05+.06 ODSCC TSP AX1AL (1) 2 43 30 Pl H06+.06 ODSCC TSP AXIAL (1) 2 43 32 PI H05+.09 ODSCC TSP AX1AL (1) 2 43 52 Pl H03.03 ODSCC TSP AXIAL (1) 2 43 54 Pi H02+.18 ODSCC TSP AXIAL (1) 7

Resolution of Defective Tubes and All l Service-Induced Wall Loss Indications j SQN Unit 1 Cycle 9 Date: 04-Mey-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 2 44 34 PI H03+.03 ODSCC TSP AXIAL (1) 2 44 34 Pl H04.12 ODSCC TSP AXIAL (1) 2 44 34 Pi H05+.00 ODSCC TSP AXIAL (1) 2 44 36 PI H05+.09 ODSCC TSP AXIAL (1) 2 44 54 Pi H06+.06 ODSCC TSP AXIAL (1) 2 45 36 24 C03+.09 C/L WASTAGE (1) j 2 45 41 Pl H06+.03 ODSCC TSP AXIAL (1) 2 45 54 Pl H04 +.03 ODSCC TSP AXtAL (1) 2 45 57 Pl H06+.06 ODSCC TSP AXIAL (1) ;

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l l

Bobbin inspection sample is category C-2 l TTS RPC inspection sample is category C-2 Dented TSP + Point inspection sample is category C-2 U-Bend + Point inspection sample is category C-2 (1) Retest Fuivre Outage S

Resolution of Defective Tubes and All Service-induced Wall Loss Indications SON Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION Sample: 0 3 1 81 30 H01 +.04 PWSCC > Sv DNT AXIAL (1) 3 1 89 SAI H07+3.60 PWSCC UBEND AXIAL PLUG 3 1 90 SAI H07+10.45 PWSCC UBEND AX1AL PLUG 3 2 86 Pl H01.12 ODSCC TSP AXIAL (1) 3 2 92 Pl H02+.06 ODSCC TSP AXIAL (1) 3 3 53 42 H01.12 PWSCC < 2v DNT AXIAL PLUG 3 3 58 52 H01.04 PWSCC < 2v DNT AXtAL PLUG 3 3 63 Pi H01.15 ODSCC TSP AXIAL (1) 3 3 75 Pl C01 +.09 ODSCC TSP AXIAL (1) 3 3 88 35 H02.05 PWSCC < 2v DNT AXfAL (1) 3 3 88 17 H04+.00 PWSCC 2-5v DNT AXIAL (1) 3 4 28 Pl H02.09 ODSCC TSP AXIAL (1) 3 4 42 Pl H04.32 ODSCC TSP AXIAL (1) 3 4 60 SCI H01 +.02 ODSCC TSP CIRC PLUG 3 4 60 PI H01.14 ODSCC TSP AXIAL 3 4 76 38 H01.06 PWSCC 2-5v DNT AXtAL (1) 3 4 84 Pl H01.24 ODSCC TSP AXIAL (1) 3 5 6 PI H02+.09 ODSCC TSP AXIAL (1) 3 5 13 Pl H01.35 ODSCC TSP AXIAL (1) 3 5 29 PI H01 +.06 ODSCC TSP AXIAL (1) 3 5 34 Pl H01 +.12 ODSCC TSP AXIAL (1) 3 5 51 PI H01 +.00 ODSCC TSP AXIAL (1) 3 5 62 30 H01 +.00 PWSCC < 2v DNT AXIAL PLUG 3 5 62 PI H01+.12 ODSCC TSP AXIAL 3 5 71 Pl H01.06 ODSCC TSP AXIAL (1) 3 5 87 Pl H01.06 ODSCC TSP AXIAL (1) 3 6 20 PI H01.09 ODSCC TSP AXIAL (1) 3 6 21 Pl H01 +.12 ODSCC TSP AXIAL (1)

/

. 2, Resolution of Defective Tebes and All Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 i

SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 3 6 26 PI H01+.03 ODSCC TSP AXtAL (1) 3 6 27 PI H01 +.12 ODSCC TSP AXfAL (1) 3 6 38 31 H02.06 PWSCC 2-5v DNT AXIAL (1) 3 6 41 PI H01 +.03 ODSCC TSP AXIAL (1) i 3 6 45 44 H03.09 PWSCC 2-5v DNT AXIAL PLUG 3 6 54 SCI H04.21 ODSCC TSP CIRC PLUG 3 6 54 SCI H06.01 PWSCC > Sv DNT CIRC 3 6 54 sal HTS.10 PWSCC HTS AXIAL 3 6 54 SAI HTS.46 PWSCC HTS AXtAL 3 6 64 SAI HTS.29 PWSCC HTS AXIAL PLUG 3 6 74 36 H01 +.46 PWSCC > Sv DNT AXIAL 3 6 74 32 H01.07 PWSCC > Sv DNT AXIAL 3 6 74 18 H01.28 PWSCC > Sv DNT AX1AL 3 6 74 55 H01.30 PWSCC > Sv DNT AXlAL PLUG 3 7 34 22 H01.44 PWSCC 2-5v DNT AXIAL (1) 3 7 36 46 H05.08 PWSCC < 2v DNT AXIAL PLUG 3 7 54 SCI H01 +.11 PWSCC > Sv DNT CIRC PLUG 3 7 65 Pl H01 +.03 ODSCC TSP AXIAL (1) 3 7 76 40 H02.24 PWSCC 2-5v DNT AXIAL PLUG 3 7 83 40 H01 +.37 PWSCC > Sv DNT AXIAL PLUG 3 7 89 Pl H01.03 ODSCC TSP AXIAL (1) 3 7 91 PI H02+.09 ODSCC TSP AX1AL (1) 3 8 3 49 H03.05 PWSCC < 2v DNT AXIAL PLUG 3 8 30 Pl H01v.03 ODSCC TSP AXIAL (1) 3 8 37 Pl H01 +.12 ODSCC TSP AXIAL (1) 3 8 40 Pi H01 +.00 ODSCC TSP AXIAL (1) 3 8 43 Pl C07+.18 ODSCC TSP AXIAL (1) 3 8 77 Pl H01 +.15 ODSCC TSP AXtAL (1) 3 9 67 43 H02+.05 PWSCC 2-5v DNT AXIAL PLUG 2

l Resolution of Defective Tubes and All l Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 3 9 83 18 H01.07 PWSCC 2-5v DNT AXIAL PLUG 3 9 83 Pl H01.23 ODSCC TSP AXtAL 1

3 9 86 SAI H01 +.01 PWSCC < 2v DNT AXlAL PLUG 3 9 86 Pl H01 +.09 ODSCC TSP AXIAL 3 9 93 Pl H01 +.20 ODSCC TSP AXIAL (1) 3 10 27 Pl H01.09 ODSCC TSP AXIAL (1) l 3 10 36 46 H01.06 PWSCC < 2v DNT AXIAL PLUG 3 10 40 38 H01.14 PWSCC 2-5v DNT AXIAL (1) 3 10 41 40 H01.14 PWSCC 2-5v DNT AXIAL PLUG 3 10 42 Pl H01 +.00 ODSCC TSP AX1AL (1) 3 10 54 SCI HTS +.06 PWSCC HTS CIRC PLUG 3 10 55 30 H01.10 PWSCC 2-5v DNT AXIAL (1) 3 10 85 80 H01.20 PWSCC < 2v DNT AXIAL PLUG 3 10 85 Pl H03.26 ODSCC TSP AXtAL 3 10 87 PI H01.23 ODSCC TSP AXtAL (1) 3 10 88 26 H02.14 PWSCC < 2v DNT AXIAL (1) 3 10 93 Pi H01 +.03 ODSCC TSP AXIAL (1) l 3 11 3 Pl H02.03 ODSCC TSP AXIAL (1) 3 11 19 SCI HTS.07 PWSCC HTS CIRC PLUG ,

1 3 11 46 Pl C01 +.09 ODSCC TSP AXIAL (1) j 3 11 46 23 H04+.44 PWSCC 2-5v DNT AXIAL (1) 3 11 72 18 H02.15 PWSCC 2-5v DNT AXIAL (1) 3 11 74 46 H01.51 PWSCC 2-5v DNT AXtAL PLUG 3 12 4 Pl H02.03 ODSCC TSP AXIAL (1) 3 12 28 Pl H01 +.00 ODSCC TSP AXIAL (1) 3 12 48 SAI HTS.19 PWSCC HTS AX1AL PLUG 3 12 69 25 H01.18 PWSCC 2-5v DNT AXIAL (1) 3 12 71 SAI H01 06

. ODSCC TSP AXlAL PLUG 3 12 81 sal H01 +.67 PWSCC > Sv DNT AXIAL PLUG 3

L.

Resolution of Defective Tubes and All Service-Induced Wall Loss Indications i SON Unit 1 Cycle 9 Date: 04-May-99 l SG ROW COL PLD LOCATION CHARACTERIZATION RESOLUTION 3 12 81 sal H01.57 PWSCC > Sv DNT AXIAL 3 13 15 Pl C04 03

. ODSCC TSP AX1AL (1) 3 13 28 Pl H01 +.00 ODSCC TSP AXIAL (1) 3 13 45 PI H01.09 ODSCC TSP AXtAL (1) 3 13 49 Pl H01 +.09 ODSCC TSP AXIAL (1) 3 13 71 Pl H03+.26 ODSCC TSP AXIAL (1) 3 13 75 19 H01.13 PWSCC 2-5v DNT AXIAL (1) 3 13 85 18 H01.03 PWSCC 2-5v DNT AXIAL (1) 3 14 37 28 H01.12 PWSCC < 2v DNT AXIAL (1) 3 14 54 Pl H01 +.06 ODSCC TSP AXIAL (1) 3 14 57 49 H01.06 PWSCC < 2v DNT AXIAL PLUG l 3 14 84 41 H01.27 PWSCC 2-5v DNT AXIAL PLUG l 3 15 29 PI H03.23 ODSCC TSP AXIAL (1) 3 15 62 SCI H01+ 17 ODSCC TSP CIRC PLUG 3 15 62 SCI H03+.06 ODSCC TSP CIRC 3 16 43 SCI HTS.12 PWSCC HTS CIRC PLUG 3 16 50 38 H01.21 PWSCC < 2v DNT AXIAL (1) 3 16 57 Pl H01.09 ODSCC TSP AXIAL (1) 3 16 64 35 H01.53 PWSCC > Sv DNT AXIAL (1) 3 16 69 32 H01 +.10 PWSCC > Sv DNT AXIAL 3 16 69 39 H01 +.46 PWSCC > Sv DNT AXIAL PLUG 3 16 69 18 H02.15 PWSCC 2-5v DNT AXIAL 3 16 71 Pl H02.29 ODSCC TSP AXIAL (1) 3 17 36 P! H01.32 ODSCC TSP AXIAL (1) 3 17 44 PI H01 +.00 ODSCC TSP AXIAL (1) 3 17 53 Pl H01.29 ODSCC TSP AXIAL (1) 3 17 79 Pi C01.03 ODSCC TSP AXIAL ('i) 3 13 68 25 H02.07 PWSCC < 2v DNT AXIAL (1) 3 18 74 51 H01 +.31 PWSCC 2-5v DNT AXIAL PLUG 4

f. 1 Resolution of Defective Tubes and All Service-induced Wall Loss indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 3 18 74 32 H01.18 PWSCC 2-5v DNT AXIAL 3 19 22 28 AV3+.00 AVB WEAR (1) j 3 19 36 Pl H01 +.00 ODSCC TSP AXtAL (1) 3 19 38 13 AV3+.00 AVB WEAR (1) 3 19 38 Pl H03.38 ODSCC TSP AXfAL (1) 3 19 68 SCI H01 +.03 PWSCC 2-5v DNT CIRC PLUG 3 19 89 Pl H01.12 ODSCC TSP AX1AL (1) 3 20 31 35 H01 +.01 PWSCC < 2v DNT AXIAL (1) 3 20 63 8 AV2+.00 AVB WEAR (1) 3 20 63 18 AV3+.00 AVB WEAR (1) 3 20 69 18 H01.10 PWSCC 2-5v DNT AXIAL (1) 3 20 85 Pl H01 +.18 ODSCC TSP AXIAL (1) 3 21 39 Pl H01+.03 ODSCC TSP AXIAL (1) 3 21 46 SCI H01 +.15 PWSCC 2-5v DNT CIRC PLUG 3 21 55 22 H01.07 PWSCC 2-5v DNT AXIAL (1) 3 21 74 SCI H01 +.00 ODSCC TSP CIRC PLUG 3 21 84 Pl H01 +.12 ODSCC TSP AXIAL (1) I 3 21 86 Pl H01 +.06 ODSCC TSP AXIAL (1) 3 21 88 PI H01 +.20 ODSCC TSP AXIAL (1) 3 22 57 Pl H01.37 ODSCC TSP AXIAL (1) 3 22 64 26 AV2+.24 AVB WEAR (1) 3 22 64 33 AV3+.00 AVB WEAR (1) 3 22 67 26 AV2 +.00 AVB WEAR (1) 3 22 67 19 AV3+.00 AVB WEAR (1) 3 22 67 14 AV4+.00 AVB WEAR (1) 3 22 74 Pl H02+.06 ODSCC TSP AXIAL (1) 3 23 68 Pl H01.27 ODSCC TSP AXIAL (1) 3 23 71 30 H01.15 PWSCC 2-Sv DNT AXIAL (1) 3 23 74 32 H01.09 PWSCC < 2v DNT AXIAL (1) 5

{

L

i Resolution of Defective Tubes and All Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 3 23 76 57 H02.18 PWSCC > Sv DNT AXIAL PLUG 3 23 85 27 H01 +.31 PWSCC 2-5v DNT AXlAL (1) 3 23 85 22 H01.21 PWSCC 2-5v DNT AXIAL (1) 3 24 62 38 H01.05 PWSCC < 2v DNT AXIAL (1) 3 24 71 19 H01 +.17 PWSCC 2-5v DNT AXIAL (1) 3 24 73 30 H01.10 PWSCC > Sv DNT AXIAL (1) 3 24 80 40 H01.19 PWSCC 2-5v DNT AXIAL PLUG 3 24 80 35 H02.08 PWSCC 2-5v DNT AXIAL 3 24 81 SCI H02.12 PWSCC 2-5v DNT CIRC PLUG / STABILIZE 3 24 84 22 H01 +.08 PWSCC 2-5v DNT AXIAL (1) 3 24 84 22 H01+.34 PWSCC 2-5v DNT AXIAL (1) 3 24 85 54 H01.03 PWSCC 2-5v DNT AXIAL PLUG 3 25 25 9 AV2+.00 AVB WEAR (1) 3 25 62 44 H01 +.41 PWSCC > Sv DNT AXIAL PLUG 3 25 66 Pl H01.12 ODSCC TSP AXIAL (1) 3 25 67 28 H01.06 PWSCC < 2v DNT AXIAL (1) l 3 25 76 SAI H01 +.06 PWSCC 2-5v DNT AXIAL PLUG 3 25 87 17 AV4+.00 AVB WEAR (1) 3 26 15 Pi C05.06 ODSCC TSP AXIAL (1) 3 26 66 Pl H02.09 ODSCC TSP AXIAL (1) 3 26 75 SCI H01 +.17 PWSCC 2-5v DNT CIRC 3 26 75 SCI H01.15 PWSCC 2-5v DNT CIRC PLUG 3 27 54 15 AV3+.67 AVB WEAR (1) 3 27 84 20 C01 +.03 C/L WASTAGE (1) 3 28 66 21 AV3+.00 AVB WEAR (1) 3 28 66 14 AV4+.00 AVB WEAR (1) 3 28 80 SCI H01 +.01 PWSCC > Sv DNT CIRC PLUG / STABILIZE 3 29 80 44 H01.25 PWSCC < 2v DNT AXIAL PLUG 3 31 68 20 H01.08 PWSCC 2-Sv DNT AXIAL (1) 6

r. .

1 1

Resolution of Defective Tubes and All Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 3 32 70 SCI H01 +.17 PWSCC 2-5v DNT CIRC PLUG 3 32 78 24 H02.08 PWSCC < 2v DNT AXIAL (1) 3 33 16 37 C01 +.00 C/L WASTAGE (1) 3 33 79 40 H01.01 PWSCC 2-5v DNT AXIAL PLUG 3 34 52 41 H01 +.12 PWSCC 2-5v DNT AXIAL PLUG 3 34 56 27 H04.12 PWSCC 2-5v DNT AXIAL (1) 3 34 72 SCI H02 10 PWSCC > Sv DNT CIRC PLUG / STABILIZE 3 34 76 BLG HTS +.00 BULGE PLUG / STAB PREVENTIVELY 3 34 76 OXP HTS +1.58 OVER EXP TTS 3 35 18 20 C01 +.00 C/L WASTAGE (1) 3 35 41 24 AV2+.00 AVB WEAR 3 35 41 42 AV3+.03 AVB WEAR PLUG 3 35 69 21 AV3+.00 AVB WEAR (1) l 3 35 69 12 AV4.26 AVB WEAR (1) l 3 3', 70 26 H01 +.07 PWSCC 2-5v DNT AXIAL (1) 3 36 19 7 C01 +.12 C/L WASTAGE (1) l 3 36 62 Pl H01.35 ODSCC TSP AX1AL (1) 3 36 67 Pl C02.03 ODSCC TSP AXIAL (1) 3 36 70 Pl H01+.12 ODSCC TSP AX1AL (1) 3 36 72 PI H01 +.09 ODSCC TSP AXIAL (1) 3 36 73 PI H02+.03 ODSCC TSP AXIAL (1) 3 38 22 19 C01 +.12 C/L WASTAGE (1) 3 38 52 Pl H02+.03 ODSCC TSP AXIAL (1) 3 38 55 31 AV3+.00 AVB WEAR (1) 3 38 55 16 AV4+.00 AVB WEAR (1) 3 38 62 21 AV3+ 00 AVB WEAR (1) 3 38 62 27 AV4+.00 AVB WEAR (1) 3 38 64 21 AV1 +.00 AVB WEAR (1) 3 38 64 36 AV2+.00 AVB WEAR (1) 7

., j Resciution of Defective Tubes and All Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 3 38 64 29 AV3+.00 AVB WEAR (1) 3 38 64 14 AV4+.00 AVB WEAR (1) 3 39 48 Pl H02.29 ODSCC TSP AXIAL (1) 3 39 73 PI H04+.12 ODSCC TSP AXIAL (1) 3 41 64 28 AV1 +.00 AVB WEAR (1) 3 42 46 19 H01.16 PWSCC > Sv DNT AXIAL (1) 3 42 .56 BLG HTS +3.55 BULGE PLUG / STAB PREVENTIVELY 3 42 58 Pl H01 +.09 ODSCC TSP AXIAL (1) 3 42 60 44 H03.11 PWSCC < 2v DNT AXIAL PLUG 3 43 31 11 C01.09 C/L WASTAGE (1) 3 43 38 45 H01.18 PWSCC < 2v DNT AXIAL PLUG 3 43 65 Pl H05+.15 ODSCC TSP AXIAL (1) 3 43 65 Pl H06+.06 'ODSCC TSP AXIAL (1) 3 44 45 22 H01 +.04 PWSCC 2-5v DNT AXIAL (1) 3 44 59 Pl H01 +.00 ODSCC TSP AXIAL (1) 3 44 61 16 C01+.00 C/L WASTAGE (1) ;

3 44 62 Pl H06*.00 ODSCC TSP AXIAL (1) 3 45 52 46 H02.07 PWSCC < 2v DNT AX1AL PLUG 3 4b 58 3 C01 +.09 C/L WASTAGE (1) 3 45 59 Pl C01 +.32 ODSCC TSP AXIAL (1) 3 46 42 18 H01.20 PWSCC 2-Sv DNT AXIAL (1) l l

8 1

\

D Resolution of Defective Tubes and All Service-induced Wall Loss indications i

SQN Unit 1 Cycle 9 Date: 04-May-99 gg ROW COL !ND LOCATION CHARACTER!ZATl_ON RESOLUTION Bobbin inspection sample is category C-2 TTS RPC inspection sample is category C-2 Dented TSP + Point inspection sample is category C-2 U-Bend + Point inspection sample is category C-3 (1) Retest Future Outage l

l l

9

\ -

Resolution of Defective Tubes and All Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL !ND LOCATION CHARACTERIZATION RESOLUTION Sample: 0 4 1 4 SAI HTS.56 PWSCC HTS AX1AL PLUG 4 1 27 SCI H03+.30 ODSCC TSP CIRC PLUG 4 1 77 SCI H07+3.68 PWSCC UBEND CIRC PLUG 4 1 80 sal H07+2.93 PWSCC UBEND AXIAL PLUG 4 1 81 SAI H07+4.07 PWSCC UBEND AXtAL PLUG 4 2 11 SCI H01.17 ODSCC TSP CIRC PLUG 4 2 12 Pl H01 +.16 ODSCC TSP AXIAL (1) l 4 2 25 26 H01.29 PWSCC > Sv DNT AXIAL (1) 4 2 49 Pl H01 +.00 ODSCC TSP AXIAL (1) 4 2 56 43 H01.25 PWSCC 2-5v DNT AXIAL PLUG 4 3 11 Pl H01 +.03 ODSCC TSP AXIAL (1) l 4 3 12 SCI H01 +.14 ODSCC TSP CIRC PLUG <

4 3 16 SCI H01.15 ODSCC TSP CIRC PLUG 4 3 27 18 H02.17 PWSCC 2-5v DNT AXtAL (1) 4 3 47 35 H03.05 PWSCC < 2v DNT AXIAL (1) 4 3 75 49 H02.10 PWSCC < 2v DNT AXtAL PLUG 4 4 9 PI H01 06 ODSCC TSP AX1AL (1) 4 4 39 35 H02+.02 PWSCC < 2v DNT AXIAL (1) {

4 4 50 SCI .Hui +.30 ODSCC TSP CIRC PLUG 4 4 69 Pl H01 +.00 ODSCC TSP AXtAL (1) 4 5 2 PI H01 +.00 ODSCC TSP AX1AL (1) 4 5 5 PI H01.06 ODSCC TSP AXIAL (1) 4 5 16 36 H01 +.06 PWSCC > Sv DNT AXIAL (1) 4 5 24 Pl H01.03 ODSCC TSP AXIAL (1) 4 5 31 PI H02+.03 ODSCC TSP AXIAL (1) 4 5 32 Pl H01.14 ODSCC TSP AXIAL (1) 4 5 33 SCI H01.24 ODSCC TSP CIRC PLUG 4 5 60 Pl H05.14 ODSCC TSP AXIAL (1) l l

l i

l l

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Resolution of Defective Tubes and All {

Service-induced Wall Loss Indications SON Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL 111 0 LOCATION CHARACTERIZATION RESOLUTION 4 5 71 Pl H01.09 ODSCC TSP AXIAL (1) 4 5 71 Pl H02+.09 ODSCC TSP AXIAL (1) 4 6 15 SCI H03.07 ODSCC TSP CIRC PLUG 4 6 18 SCI H03.25 ODSCC TSP CIRC PLUG 4 7 10 SCI H01.19 ODSCC TSP CIRC PLUG 4 7 57 Pl H01.09 ODSCC TSP AXIAL (1) 4 7 75 52 H01 +.06 PWSCC < 2v DNT AXIAL PLUG 4 8 4 Pl H01 +.00 ODSCC TSP AXIAL (1) 4 8 10 21 H01.21 PWSCC 2-5v DNT AXtAL (1) 4 8 46 SAI HTS.34 PWSCC HTS AXlAL PLUG 4 9 38 SCI H01 +.21 ODSCC TSP CIRC PLUG 4 10 4 40 H01 +.03 PWSCC < 2v DNT AXIAL PLUG 4 10 51 Pl H06+.00 ODSCC TSP AXIAL (1) 4 10 69 PI H01 +.03 ODSCC TSP AXIAL (1) 4 11 35 43 H02.08 PWSCC < 2v DNT AXIAL 4 11 35 45 H04 +.22 PWSCC > Sv DNT AXIAL PLUG 4 11 58 PI H01.09 ODSCC TSP AXIAL (1) 4 11 62 Pl H01.06 ODSCC TSP AXIAL (1) 4 11 77 52 H03.27 PWSCC < 2v DNT AXIAL PLUG 4 12 29 SCI HTS.09 PWSCC HTS CIRC PLUG 4 13 15 3CI HTS.35 PWSCC HTS CIRC PLUG 4 13 37 21 H04.15 PWSCC > Sv DNT AXIAL 4 13 37 SCI HTS.11 PWSCC HTS CIRC PLUG 4 13 46 SCI HTS.15 PWSCC HTS CIRC PLUG 4 13 61 97 H03.40 PWSCC > Sv DNT AXIAL PLUG 4 14 62 24 H02.13 PWSCC 2-5v DNT AXtAL (1) 4 14 81 PI H02+.00 ODSCC TSP AXIAL (1) 4 15 42 38 H01+.32 PWSCC > Sv DNT AXIAL (1) 4 15 59 26 H02.23 PWSCC > Sv DNT AXIAL ,

1 2

. 4 r,

Resolution of Defective Tubes and All Service-induced Wall Loss indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 4 15 59 38 H02.59 PWSCC > Sv DNT AXIAL PLUG 4 16 67 Pl H01.03 ODSCC TSP AXIAL (1) 4 17 11 38 H01 +.39 PWSCC > Sv DNT AXIAL PLUG 4 17 48 Pl H03.06 ODSCC TSP AXIAL (1) 4 17 53 40 H01.14 PWSCC < 2v DNT AXIAL PLUG 4 18 11 Pl H01 +.00 ODSCC TSP AXIAL (1) 4 18 33 SCI HTS.69 PWSCC HTS CIRC PLUG 4 19 7 Pl H01 +.00 ODSCC TSP AXIAL (1) 4 20 21 Pi C05+.00 ODSCC TSP AX1AL (1) 4 20 44 SCI H01 +.00 PWSCC > Sv DNT CIRC PLUG 4 20 58 PI H01.06 ODSCC TSP AXIAL (1) 4 20 59 Pl H01.09 ODSCC TSP AXIAL (1) 4 20 59 Pl H02+.06 ODSCC TSP AXIAL (1) 4 21 17 4 C01.03 C/L WASTAGE (1) 4 21 57 35 H01 +.40 PWSCC > Sv DNT AXIAL PLUG 4 22 56 Pl H01.06 ODSCC TSP AXIAL (1) 4 22 86 Pl H02+.09 ODSCC TSP AXlAL (1) 4 23 11 Pl H01.06 ODSCC TSP AXIAL (1) 4 23 24 Pl H01.23 ODSCC TSP AX1AL (1) 4 23 37 18 H01.17 PWSCC > Sv DNT AXIAL (1) 4 23 43 43 H01 +.39 PWSCC > Sv DNT AXIAL PLUG 4 23 43 40 H01.57 PWSCC > Sv DNT AXIAL 4 24 10 Pl H02.17 ODSCC TSP AXIAL (1) 4 24 56 19 AV3+.00 AVB WEAR (1) 4 25 22 MCI H01 +.08 PWSCC 2-5v DNT CIRC 4 25 22 MCI H01.03 PWSCC 2-Sv DNT CIRC PLUG

)

4 25 61 Pl H01 +.15 ODSCC TSP AXIAL (1) 4 25 70 Pl H06.06 ODSCC TSP AXIAL (1) 4 26 12 sal H01 +.00 ODSCC TSP AXIAL PLUG 3 l l

l i

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1,

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i l Resolution of Defective Tubes and All Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 4 26 63 21 H02+.00 PWSCC < 2v DNT AXIAL 4 26 63 25 H02.12 PWSCC < 2v DNT AXIAL 4 26 63 46 H02.29 PWSCC < 2v DNT AXlAL PLUG 4 27 13 Pl H01.09 ODSCC TSP AXIAL (1) 4 28 18 20 H01.17 PWSCC 2-5v DNT AXIAL (1) 4 28 24 SCI H01 +.00 ODSCC TSP CIRC PLUG 4 28 40 Pl H03+.00 ODSCC TSP AXlAL (1) 4 28 45 25 AV2+.00 AVB WEAR (1) 4 28 47 26 AV2+.00 AVB WEAR (1) 4 28 52 52 H01.09 PWSCC > Sv DNT AXIAL PLUG 4 29 31 26 AV1 +.09 AVB WEAR (1) 4 29 31 32 AV2.36 AVB WEAR (1) 4 29 31 33 AV3.06 AVB WEAR (1) 4 29 31 22 AV4+.00 AVB WEAR (1) 4 29 84 Pl H02+.03 ODSCC TSP AXIAL (1) 4 30 44 PI H02.03 ODSCC TSP AXIAL (1) 4 30 72 Pl C05+.00 ODSCC TSP AXIAL (1) 4 31 16 Pl H03+.00 ODSCC TSP AXIAL (1) 4 31 18 57 H01.33 PWSCC < 2v DNT AXIAL PLUG 4 31 20 PI H01 +.06 ODSCC TSP AXIAL (1) !

4 31 37 Pl H03+.03 ODSCC TSP AXIAL (1) 4 31 62 Pl H06+.00 ODSCC TSP AXIAL (1) l 4 32 24 Pl H01.09 ODSCC TSP AXIAL (1) 4 32 49 27 AV3+.00 AVB WEAR (1) 4 33 22 Pl H01.03 ODSCC TSP AXIAL (1) 1 4 33 55 Pl H07.03 ODSCC TSP AXIAL (1) 4 33 60 19 AV2.06 AVB WEAR (1) 4 33 60 24 AV3.20 AVB WEAR (1) 4 33 76 Pl H05+.03 ODSCC TSP AXIAL (1) 1 4

.- f, Resolution of Defective Tubes and All l Service-induced Wall Loss indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION 4 35 43 31 AV2+.00 AVB WEAR (1) 4 35 43 25 AV3+.00 AVB WEAR (1) 4 35 58 18 H01.18 PWSCC > Sv DNT AXIAL (1) 4 36 22 32 H02.18 PWSCC 2-5v DNT AXIAL (1) 4 37 30 Pl H03.03 ODSCC TSP AX1AL (1) 4 37 69 Pl H06+.09 ODSCC TSP AXIAL (1) 4 38 38 SCI H01.11 PWSCC > Sv DNT CIRC PLUG / STABILIZE 4 38 63 Pl H03+.03 ODSCC TSP AXIAL (1) 4 39 23 Pl H01 +.03 ODSCC TSP AXIAL (1) 4 39 36 SCI H01.11 PWSCC > Sv DNT CIRC PLUG 4 39 55 18 AV2.21 AVB WEAR (1) 4 39 55 29 AV3+.00 AVB WEAR (1) l 4 41 27 SAI HTS.10 PWSCC HTS AXIAL PLUG 4 41 42 PI H04.03 ODSCC TSP AX1AL (1) 4 43 52 19 H01 +.16 PWSCC 2-5v DNT AXIAL (1) 4 45 52 Pl H06+.06 ODSCC TSP AX1AL (1) 5 1

L

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I Resolution of Defective Tubes and All Service-induced Wall Loss Indications SQN Unit 1 Cycle 9 Date: 04-May-99 SG ROW COL IND LOCATION CHARACTERIZATION RESOLUTION t

Bobbin inspection sample is category C-2 j TTS RPC inspection sample is category C-2 Dented TSP + Point inspection sample is category C-2 U-Bend + Point inspection sample is category C-3 1

1 1

I i

I (1) Retest Future Outage 1

6 l

1

- t; t, Table 3 Axial PWSCC at Dented TSPs Left in Service Length Outside Max. Avg Depth Length SG Row Column Location From To TSP Max. Volts Depth (%) (%) (in.)

1 20 66 H02 0.03 0.38 0.01 0.54 38.95 19.59 0.36 3 10 40 H01 -0.14 0.48 0.11 1.34 38.48 31 08 0.63 3 4 76 H01 -0.06 0.19 0.72 37.55 21.04 0.26 4 15 42 H01 0.32 0.45 0.08 0.41 37.55 27.77 0.13 3 16 50 H01 -0.21 0.25 1.25 37.55 26.65 0.47 3 24 62 H01 -0.0C 0.15 0.52 37.55 23.82 0.20 1 26 58 H01 -0.16 0.19 0.48 37.55 26.71 0.36 4 5 16 H01 0.06 0.64 0.27 0.56 35.68 22.87 0.59 4 3 47 H03 -0.05 0.41 0.04 0.88 34.75 24.21 0.47 3 3 88 H02 -0.05 0.25 0.88 34.75 23.79 0.30 4 4 39 H02 0.02 0.17 0.52 34.75 24.12 0.15 j 3 16 64 H01 -0.53 -0.35 0.16 0.64 34.75 22.28 0.18 j 3 20 31 H01 0.01 0.22 0.69 34.75 23.91 0.21 3 23 74 H01 -0.09 0.07 0.83 31.95 18.54 0.16 4 36 22 H02 -0.16 0.21 0.78 31.95 22.84 0.37 3 10 55 H01 -0.12 0.17 0.67 31.48 20.84 0.30 3 1 81 H01 0.04 0.29 1.27 30.09 19.06 0.25 3 6 38 H02 -0.06 0.12 0.36 30.09 16.30 0.18 3 23 71 H01 -0.15 0.06 0.58 30.09 19.93 0.21 3 24 73 H01 -0.10 0.08 0.78 30.09 20.93 0.18 4 2 25 H01 -0.27 -0.10 0.45 29.00 20.30 0.17 3 34 56 H04 -0.12 0.16 1.02 29.00 21.07 0.28 3 14 37 H01 -0.12 0.02 0.35 27.29 19.55 0.14 3 23 85 H01 0.31 0.51 0.14 0.69 27.29 18.83 0.20 j 3 25 67 H01 -0.06 0.12 0.75 27.29 18.22 0.18 )

3 35 70 H01 0.07 0.27 0.88 25.89 17.82 0.20 3 10 88 H02 -0.14 0.07 0.80 25.89 16.91 0.21 3 32 78 H02 -0.08 0.08 0.97 24.49 12.55 0.16 3 12 69 H01 -0.18 -0.06 0.41 24.49 16.45 0.11 ,

3 18 68 H02 -0.07 0.11 0.69 24.49 16.43 0.18 )

4 14 62 H02 -0.13 0.09 0.72 23.55 12.88 0 22 i 3 11 46 H04 0.44 0.60 0.16 0.44 22.62 14.71 0.16 l 3 7 34 H01 -0.44 -0.07 0.07 0.61 21.69 10.88 0.38 I 3 21 55 H01 -0.07 0.21 0.49 21.69 9.43 0.28 1 3 23 85 H01 -0.21 0.02 0.67 21.69 10.13 0.23 3 24 84 H01 0.08 0.29 0.87 21.69 13.68 0.21

. ^

3'~ 24 84 H01 0.34 0.45 0.08 0.40 21.69 16.57 0.11 3 44 45 HO1 0.04 0.17 0.37 21.69 11.24 0.13 4 8 10 H01 -0.21 0.17 0.58 21.22 12.03 0.38 3 31 68 H01 -0.08 0.29 0.56 19.36 8.17 0.37 ,

4 43 52 H01 0.16 0.31 0.50 19.36 14.12 0.15 l 3 13 75 H01 -0.13 0.29 0.78 18.89 9.95 0.42 3 24 71 H01 0.17 0.54 0.17 0.74 18.89 11.17 0.38 3 42 46 H01 -0.16 0.02 0.37 18.89 11.68 0.18 4 3 27 H02 -0.17 0.00 0.22 17.96 11.19 0.17 3 3 88 H04 0.00 0.14 0.55 17.96 11.72 0.14 3 11 72i H02 -0.15 -0.01 0.70 17.96 12.98 0.14 1 12 2l 'H01 0.18 0.39 0.02 0.87 17.96 11.15 0.21 3 13 F.5 ' 701 -0.03 0.16 0.63 17.96 10.95 0.19 3 20 69 jJ1 -0.10 0.06 0.37 17.96 11.00 0.16

P, t '

Tabla 3 Axial PWSCC at Dented TSPs Left in Service Length Outside Max. Avg Depth Length SG Row Column Location From To TSP Max. Volts Depth (%) (%) (in. )

4 23 37 H01 -0.17 0.11 0.70 17.96 11.39 0.29

_, 4 28 18 H01 -0.16 0.26 0.72 17.96 10.81 0.43 4 35 58 H01 -0.18 -0.06 0.32 17.96 13.69 0.12 3 46 42 H01 -0.20 0.19 0.47 17.96 11.80 0.40 i

1 j

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l Table 4 Axial PWSCC at Dented TSPs Removed From Service Length Outside Max. Avg Depth SG Row Column Location From To TSP Max. Volts Depth (%) (%) Length (in.)

4 13 61 H03 -0.40 -0.15 0.03 0.46 91.66 76.82 0.26 3 10 85 H01 -0.20 0.14 1.56 80.47 36.05 0.35 1 17 55 H01 0.20 0.37 0.75 67.00 47.06 0.17 1 3 59 H01 0.47 0.60 0.23 0.47 64.00 36.77 0.13 2 18 30 H01 -0.17 0.15 1.75 59.01 46.30 0.33 3 23 76 H02 -0.18 0.03 1.11 57.14 27.63 0.21 4 31 18 H01 -0.33 0.23 1.18 57.14 41.34 0.57 2 14 33 H02 -0.12 0.17 0.91 56.21 40.02 0.30 3 6 74 H01 -0.51 -0.30 0.14 1.30 54.34 41.65 0.21 3 24 85 H01 -0.03 0.15 0.46 54.34 38.51 0.18 )

4 7 75 H01 -0.06 0.18 1.24 52.48 36.17 0.25 j 4 11 77 H03 -0.27 0.07 1.59 52.48 42.40 0.35 l 4 28 52 H01 -0.09 0.04 0.46 52.48 32.57 0.13 3 3 58 H01 -0.04 0.17 1.02 51.54 37.00 0.21 3 18 74 H01 0.31 0.52 0.14 1.15 50.14 33.15 0.21 )

3 8 3 H03 -0.05 0.25 1.25 48.75 39.70 0.31 {

3 14 57 H01 -0.06 0.15 0.85 48.75 32.33 0.21

]

4 3 75 H02 -0.10 0.20 1.29 48.75 32.73 0 31 )

3 7 36 HOS -0.08 0.15 0.76 45.95 28.56 0.23 )

3 10 36 H01 -0.06 0.38 0.01 2.10 45.95 33.14 0.45 3 11 74 H01 -0.51 0.67 0.43 2.02 45.95 30.34 1.19

)

j 3 45 52 H02 -0.07 0.14 0.99 45.95 36.00 0.21 4 26 63 H02 -0.29 0.02 1.04 45.95 32.45 0 31 1 23 88 H01 -0.10 0.06 0.25 45.25 26.27 0.16 l 3 29 80 H01 -0.25 0.10 1.60 44.55 28.43 0.36 3 42 60 H03 -0.11 0.19 0.75 44.55 31.25 0.31 3 43 38 H01 -0.18 0.03 1.34 44.55 35.94 0.21 4 11 35 H04 0.22 0.51 0.14 0.95 44.55 32.54 0.30 3 6 45 H03 -0.17 0.28 0.77 44.08 31.02 0.46 3 9 67 H02 0.05 0.26 0.73 43.15 25.51 0.21 i 3 25 62 H01 0.41 0.57 0.16 0.69 43.15 34.14 0.16 4 2 56 H01 -0.25 -0.04 0.59 43.15 30.47 0.21 4 11 35 H02 -0.08 0.12 0.70 43.15 29.47 0.20 4 23 43 H01 0.40 0.53 0.13 0.45 43.15 30.68 0.13 3 3 53 H01 -0.12 0 13 0.49 42.21 31.85 0.26 3 14 84 H01 -0.27 0.19 0.92 41.75 30.86 0.46 2 8 32 H01 -0.17 -0.05 0.33 41.28 29.20 0.12 !

3 9 86 H01 -0.02 0.13 1.11 41.00 29 57 0.15 3 25 76 H01 0.02 0.11 0.56 41.00 29.42 0.09 _

3 34 52 H01 0.12 0.30 0.37 40.81 26.53 0.1 t 3 7 76 H02 -0.24 0.01 0.92 40.35 25.03 0.26 _

3 7 83 H01 0.37 0.51 0.14 0.47 40.35 21.68 0.14 3 24 80 H01 -0.19 0.35 1.09 40 35 24.02 0.54 3 33 79 H01 -0.01 0.17 0.50 40 35 22.37 0.18 4 10 4 H01 0.03 0.22 0.84 40.35 30.58 0.19 i 4 17 53 H01 -0.14 0.20 0.82 40.35 21.23 0.35 l 4 23 43 H01 -0.57 -0.41 0.16 0 63 40.35 29.27 0.16 3 10 41 H01 -0.14 0.16 0.86 39.88 26.36 0.30 ,

3 16 69 H01 0.46 0.69 0.23 0.56 38.95 28.65 0.23 4 17 11 H01 0.39 0.65 0.26 0.57 38.48 22 51 0.26 3 24 80 H02 -0.06 0.30 1.34 38.00 22.50 0.36 4 15 59 H02 -059 -0.41 0.18 0 60 37.55 26.82 0.18 L

- t t .$ .

o ., 4 Table 4 Axial PWSCC at Dented TSPs Removed From Service Length Outside Max. Avg Depth SG Row Column Location From To TSP Max. Volts Depth (%) (%) Length (in.)

3 6 74 H01 0.46 0.65 0.19 0.72 36.15 26.45 0.19 3 24 80 H01 0.43 0.60 0.17 0.90 36.15 25.02 0.17 2 10 34 H01 0.06 0.25 0.41 35.68 19.93 0.19 4 21 57 H01 0.40 0.60 0.2 0.73 34.75 26.87 0.20 3 12 81 H01 0.50 0.67 0.17 0.54 33.35 22.71 0.17 3 6 74 H01 -0.07 0.20 1.01 31.95 18.51 0.28 3 16 69 H01 0.10 0.29 0.89 31.95 23.45 0.19 3 18 74 H01 -0.18 -0.01 0.86 31.95 19.54 0.17 3 5 62 H01 0.00 0.12 0.57 30.09 21.97 0.12 4 15 59 H02 -0.23 0.02 0.72 26.35 12.14 0.26 4 26 63 H02 -0.03 0.18 0.65 23.55 12.88 0.21 4 13 37 H04 -0.15 0.02 0.50 20.76 8 02 0.17 4 26 63 H02 0.00 0.18 0.71 20.76 13.91 0.18 3 6 74 H01 -0.28 -0.13 0.34 17.96 9.89 0.15 3 9 83 H01 -0.07 0.07 0.44 17.96 10.27 0.14 3 16 69 H02 -0.15 0.03 0.53 17.96 10.82 0.18 3 12 81 H01 -0.63 -0.57 0.06 0.30 16.00 8.67 0.06

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ML20211F903

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