2CAN069705, Forwards Results of Steam Generator Tubing Inservice Insps Performed During Twelfth Refueling Outage

Forwards Results of Steam Generator Tubing Inservice Insps Performed During Twelfth Refueling Outage

ML20140E803
Person / Time
Site:	Arkansas Nuclear
Issue date:	06/05/1997
From:	Mims D ENTERGY OPERATIONS, INC.
To:	Merschoff E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
2CAN069705, 2CAN69705, NUDOCS 9706120207
Download: ML20140E803 (30)

Text

a Entergy operations, Inc.

s e

E.NTERGY

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1448sa 333 Rut.:;rMc. AR 72801 Td L^1858-5000 June 5,1997 2CAN069705 Mr. Ellis W. Merschoff Regional Administrator U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064

Subject:

Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6 Special Report: Steam Generator Tube Surveillance - Category C-3 Results Gentlemen:

Steam generator tubing inservice inspections of the Arkansas Nuclear One, Unit 2 (ANO-2), steam generators (SGs) were performed during the twelfth refueling outage (2R12).

The inspections performed on both SGs were a 100% full length bobbin coil examination, with the exception of the tube area below the sleeves (20% of the tubes were examined with the bobbin coil below the sleeves). Also performed in 2R12 were a 100% rotating pancake coil probe (RPC) inspection in the hot leg (HL) exp msion transition (ET) region, a 20% RPC inspection of the cold leg ET region bounded by th sludge pile, a 100% inspection of existing installed Babcock & Wilcox (B&W) kinetic sleeves using a Plus Point probe, a 20%

inspection (plus 28 previously identified indications) of installed Combustion Engineering (CE) tungsten inert gas (TIG) welded sleeves (later expanded to 100% on the "B" SG) utilizing a Plus Point probe, a 40% inspection of row I small radius U-bends using RPC, and a 20% RPC inspection of tubes at HL drilled tube support plate (DTSP) locations (later expanded to 100% in the "B" SG). The RPC used consists of a 0.115 inch pancake coil with both axially-oriented and circumferentially-oriented coils. The bobbin coil inspection was performed to meet the requirements of ANO-2 Technical Specification (TS) 4.4.5.2.

The RPC inspection was utilized in regions ofinterest and for confirmation of bobbin coil calls.

The results of these inspections revealed 327 defective tubes in the "A" SG (SGA) and 362 defective tubes in the "B" SG (SGB). Consequently, both the SGs fall within the criteria of Category C-3 (more than 10% of the total tubes inspected are degraded tubes or more than 1% of the inspected tubes are defective), as defined in ANO-2 TS 4.4.5.2. Tables 1 and 2 summarize the results of these inspections. ANO-2 TSs 4.4.5.5.c and 6.9.2.j require that a i

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2CAN069705 Page 2

' Special Report be submitted prior to resumption of plant operation for inspections that fall into Category C-3. This submittal provides the required report. Additionally, ANO-2 TS 4.4.5.5.a requires that a plugged tube report be submitted within 15 days of each inservice inspection of SG tubes. This submittal also includes the information required for that report.

1 l

PLANT DESCRIPTION i

ANO-2 is a Combustion Engineering (CE) Model 2815 designed plant that began commercial operation in March,1980. The plant has two recirculating SGs, each having 8411 high temperature mill annealed Inconel Alloy 600 tubes with a 0.75" outer diameter and a 0.048" wall thickness. The tubes were full depth explosively expanded into the tubesheet. The tube supports in the lower part of the SG are eggerate (EC) type which consists of an array of ir.tersecting one inch wide and two inch wide flat carbon steel plates at each support elevation.

There are seven full EC support plates, two partial EC support plates, two partial drilled support plates, and five strap supports for the horizontal run of the tubing, called batwings (BW). The BW supports consist of two diagonal and three vertical straps. Two tube sleeve types, B&W kinetic and CE TIG-welded, are currently installed in the SGs.

INSPECTION RESULTS Below is a breakdown of the initial scope and expansions:

Test Type

1. Planned

% Scope Expansion SGA Bobbin 7594 100 No Bobbin Below Sleeves 153 20 No RPC ET HL 6802 100 No RPC ET CL 1742 20 No B&W Sleeve 354 100 No TIG Sleeve 131*

20 No U-bends (row 1) 28 40 No DTSP 728 20 No SGB Bobbin 7700 100 No Bobbin Below Sleeves 71 20 No RPC ET HL 7476 100 No RPC ET CL 1742 20 No B&W Sleeve 49 100 No TIG Sleeve 44*

20 Yes TIG Expansion 130 100 No U-bends (row 1) 25 40 No j

DTSP 698 20 Yes DTSP Expansion 722 20 No

• Includes 20% plus the previous indications a

U. S. NRC June 5,1997 2CAN069705 Page 3 The expansion in the TIG welded sleeves in SGB were due to an indication in the weld zone that was not previously idontified during 2Rll, but was identified based on re-analysis. All TIG sleeves in SGA not previously tested were re-analyzed for indications that may not have I

been previously identified Eighteen tubes were found to have possible weld zone indications (WZIs) and were tested with the Plus Point coil during 2R12. The expansion in the DTSPs in SGB was due to one volumetric indication. Revision 4 of the EPRI Guidelines states that a noncrack-like indication requires an expansion of 20% in the same generator. No indications were identified in the expansion.

The inspections were performed from the hot and cold leg sides of both SGs. In SGA,327 tubes were found to have indications requiring repair, due to either exhibiting flaw-like distorted support indications (DSIs), non-quantifiable indications (NQIs), volumetric indications or containing circumferential indications in the ET region or sleeve weld zone. All DSIs and NQIs confirmed by the RPC as crack-like were repaired and are detailed in the attached Table 1. In SGB,362 tubes were found to have indications requiring repair, due to either exhibiting flaw-like DSIs, NQIs, or containing circumferential indications in the ET region or sleeve weld zone. All DSIs and NQIs confirmed by the RPC as crack-like were repaired and are detailed in the attached Table 2. The number of tubes repaired, based upon flaw location, is provided in Table 3.

The ET region indications were primarily circumferential cracks with some axial cracking present in a few tubes. The eggcrate indications were predominantly axial cracks based upon RPC characterization and observations from previously pulled tubes. Sludge pile indications are generally considered to be axial and/or volumetric in nature. The BW flaws detected consisted mostly of wear attributed to flow induced vibration across the horizontal portion of the tubing at the upper support structure. The inservice tubes containing both types of previously installed sleeves revealed indications in the parent tubes. The indication in the DTSP was volumetric. No indications were found in the 40% examination of the small radius U-bends performed in row 1.

EVAL'UATION OF INSPECTION RESULTS Several enhancements were incorporated during 2R12 to improve the data and enhance the detection and disposition ofindications. The first change was the use of a larger diameter bobbin probe. Previously the 0.580 bobbin was used. The 0.600 bobbin, which is Appendix H qualified, was utilized. The second change was incorporating more representative examples of eggerate flaws in the training and testing material. Due to interferences from the support plate, sludge and the influence of copper, analysis of the eggerates is difficult. Special emphasis was placed on analysis in this area of the generator. The third change was the use of an Entergy oversight team that consisted of Level III analysts from Entergy, Palo Verde and Zetec. The team was responsible for screening the data for repairable indications that were dispositioned by the resolution team as not requiring repair. Additionally, the team reviewed approximately 10% of tubes classified as no detectable degradation (NDD).

Other a

U. S. NRC June 5,1997 2CAN069705 Page 4 enhancements include: 1) tertiary computer data screening (CDS); 2) resolution analyst training; 3) analyst performance tracking; and 4) independent resolution an:Jysis.

CIRCUMFERENTIAL CRACKING This was the eighth inspection of the ET region with either a pancake or a Plus Point probe.

Listed below is the history, sarnple size, number ofindications, and probe used:

OUTAGE

% HL SAMPLE

1. HL CRACKS DETECTION PROBE 2F92 (3/92) 100 469 0.080 RPC 2R9 (9/92) 100 25 0.080 RPC 2P93 (5/93) 100*

48 0.080 RPC 2R10 (3/94) 100 170 0.115 RPC 2P95 (1/95) 100*

283 0.115 RPC 2R11 (9/95) 100 702

+ POINT 2F96 (11/96) 100 26 0.115 RPC 2R12 (5/97) 100 119 0.115 RPC

• 100% of the sludge pile ANO-2 TTS CIRCUMFERENTIAL CRACK HISTORY 800 g g gg,.; e p py

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U. S. NRC June 5,1997 '

2CAN069705 Page 5

" The 0.115" pancake coil has demonstrated on numerous occasions at ANO-2, its ability to detect circumferential cracking. In-situ pressure tests performed during the last several outages have demonstrated the RPC's ability to detect cracks at an early stage, such that they do not become structurally significant between examination periods. The 0.115" has been very successful in finding circumferential indications at the expansion transition and is Appendix H qualified for detection. To date, the repair criterion for all circumferential indications at the ET is to repair upon detection.

Based on documented burst testing data, all circumferential cracks identified in 2R12 would exhibit burst pressures significantly above RG 1.121 limit, with most being near that of a virgin tube. To further assess the structural significance of the flaws, in-situ pressure tests were conducted. The two largest ET region circumferential cracks were selected for testing.

The pressure test device utilizes two expandable bladders approximately 6.0" apart, allowing the chamber between the bladders to be pressurized. The device is designed to allow movement of the region between the bladders such that the axial load that would be applied to the U-bend of the tube during normal operation and-postulated accident conditions is simulated for circumferential cracking.

E The two tubes selected for in-situ pressure testing were the largest circumferential flaws

]

identified during 2R12. Both tubes were pressurized to 4800 psig with no indication of leakage.

AXIAL CRACKING (EGGCRATE)

Cracking at eggerates was first detected at ANO-2 in 1991. Based on the examination results of tubes removed during outages in 1992 and 1996, the eggerate support flaws are classified as axially oriented outside diameter stress corrosion cracking. The cracking can be single cracks or multiple cracks interconnected in the tube within the eggerate support. As noted in Figure 2, the largest number ofindications are associated with the hottest support plate and decrease as the temperature decreases.

1 U. S. NRC June 5,1997

, 2CAN069705 Page 6 v

ANO-2 EGGCRATE DISTRIBUTION 140 bgdA;Mf;l#y&p"g<ggggRst g.L gympnN;

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iE ? 5 E 2 8 8 LOCATION Figure 2 (2R12)

Prior to 2R12, a qualified bobbin sizing methodology was used to leave eggerate indications in service. Approximately 280 indications were left in service in the November 1996 forced outage (2F96). Prior to 2R12 it was decided that all eggerate indications that were confirmed by RPC would be removed from service. The only indications that were sized and left in service were wear indications at the batwings.

Six of the large.t eggerate flaws (1 in SGA and 5 in SGB) were in-situ pressure tested. The criteria for choosing the candidates included several parameters, i.e., signal amplitude and depth as measured by bobbin and RPC, as well as RPC length measurements. All indications passed the peak accident pressure with zero leakage, as well as the RG 1.121 limit of three times the normal diferential operating pressure (3AP) without bursting. For ANO-2, that pressure is equal to 4576 psig. The following tubes were in-situ pressure tested:

U. S. NRC June 5,1997 2CAN069705 Page 7 L

ANO-2 IN-SITU TEST RESULTS FOR 2R12 l

I SG Date Tube R/L Target P Pressure Maw Type Leakage Leakage (psig)

(psig)

(gpm)

A 6/1/97 R82L118 1600 1600 O1H AXIAL NO 2850 2850 NO l

4800 4700 YES 0.15 l

4800*

5000 BURST l

l B

5/31/97 R9L117 1600 1600 O1H AXIAL NO l

2850 2900 NO l

4800 4900 NO l

l B

5/31/97 R11L129 1600 1650 O1H AXIAL NO 2850 2900 NO 4800 4850 NO B

5/31/97 R34L70 1600 1650 O1H AXIAL NO l

2850 2850 NO 4800 4850 NO B

5/31/97 R23L65 1600 1650 02H AXIAL NO 2850 2850 NO 4800 4850 NO I

B 5/31/97 R37L67 1600 1650 O1H AXIAL NO 2850 2850 NO 4800 4650 BURST

• Sealing bladder in place over the flaw.

The leakage values shown above are as-measured and have not been compensated for temperature. When temperature compensated, the indicated leakage would be less. The target pressure of 4800 psig was chosen to ensure the RG margin value was obtained.

j FREE-SPAN INDICATIONS Several freespan indications were identified during the bobbin coil inspection as NQIs and were subsequently examined using the RPC.

Most of the confirmed indications were volumetric and not axial cracks. All indications were bounded by the flaws first identified i

during 2R11. SGA contained 38 and SGB contained four indications. All were repaired by mechanical plugging.

i

U. S. NRC June 5,1997 2CANM9705 Page 8 SELECTION PROCESS FOR IN-SITU CANDIDATES Several parameters were considered in the choice of the "lergest" flaws for testing, so as to i

bound the remaining flaws. Not only were the ECT parameters considered, but also the morphology of the flaw. Such things as depth, overall length, length of throughwall extent, and presence ofligaments were also considered. Below is the listing of candidates and the i

associated ECT pararacters-1 l

CIRCUMFERENTIAL 1

l t

GEN. ROW COL. IND. LENGTH ARC RPC VOLTS RPC PHASE (in)

(deg)

ANGLE A

15 25 SCI 1.98 307 1.20 53 A

52 50 MCI 2.02 313 1.06 100 EGGCRATE AXIAL l

l GEN. ROW COL. IND. LOCATION LENGTH BOBBIN BOBBIN RPC DEPTH (in)

VOLTS PHASE ANGLE A

46 98 MAI OlH.98 1.94 0.76 70 53 %

A 38 108 MAI 02H-1.03 1.65 0.40 64 61 %

A 49 103 MAI 01H.87 1.22 0.56 74 47%

A 82 118 MAI 01H.48 1.36 0.97 50 83 %

l A

38 142 SAI OlH.09 0.89 1.34 59 67 %

l B

23 65 MAI 02H.96 1.89 0.35 74 67 %

l B

68 66 SAI 03H.90 1.67 0.21 60 58%

l B

37 67 SAI 01H.85 1.86 0.25 55 62 %

l B

34 70 MAI 01H.36 1.34 0.30 81 50 %

i B

82 90 MAI 02H.99 1.14 0.24 64 51 %

B 65 99 SAI OlH+.22 1.26 0.37 66 59%

B 43 105 MAI 01H.54 1.43 0.17 92 48 %

l B

9 117 SAI 01H.09 0.97 1.13 42 95 %

B 11 129 SAI 01H.14 0.76 1.51 43 90 %

SCI - Single circumferential indication L

MCI - Multiple circumferential indication SAI-Single axialindication MAI-Multiple axialindication The entries listed above in bold represent those tubes that were chosen for testing. For the i

eggerates, it should be noted that the parameters of the tubes tested bound parameters of the other candidate tubes, e.g., bobbin amplitude, depth and phase angle. The actual terrain maps from the RPC analysis were also used to determine morphology.

l l

U. S. NRC June 5,1997 i

2CAN069705 Page 9

" Tube 37/67 had the most susceptible condition with two deep sections connected by a ligament. This tube did burst at 4650 psig and exhibited zero leakage at main steam line break i

(MSLB) conditions.

ROOT CAUSE l

Based on the examination results of the tubes pulled in the Spring 1992 forced outage (2F92) and the Fall 1996 forced outage (2F%), the damage at both the eggcrate support plates and i

the ET region is stress corrosion cracking (SCC). Sulfur was believed to be a major contributor. In addition, lead was found in the cracks of the 1992 tubes and in the tube deposits for both the 1992 and 1996 tubes. Minor intergranular attack occurs with the SCC.

CONCLUSIONS l

In summary, a comprehensive eddy current examination was performed with an enhanced analysis process Both SGs were tested 100% full length with the bobbin coil,100% at the i

hot leg ET region with RPC, 20% of the cold leg ET in the sludge pile region,100% of the existing B&W kinetic installed sleeves, all TIG weld sleeves with a previous WZI or GEO indication and 20% of the remaining sleeves,40% inspection of row 1 small radius U-bends, and ein expanded inspection in SGB for TIG sleeves and DTSP.

The 119 clI:umferential cracks detected in 2R12 exhibited a size that was bounded by previous inspections. The increased number is primarily attributed to increased analyst sensitivity and the review of the oversight team. These cracks would be expected to exhibit burst pressures well above that required by RG 1.121. The in-situ pressure tests of the largest flaws demonstrated that the flaw strengths exceeded 3 AP with zero leakage.

j The increased number of repaired eggerate axial cracks during 2R12 is attributed to the program enhancements and the decision to remove all crack-like indications. These cracks would be expected to exhibit burst pressures at or above that required for structural adequacy as defined in RG 1.121. The largest crack was successfully in-situ pressure tested in excess of 3AP. Free span indications were identified this outage and are readily identified by bobbin coil. Structurally, the largest of these flaws would be expected to burst at pressures well above that required by RG 1.121 as demonstrated by previous in-situ pressure testing and analytical evaluations.

The indications in the TIG welded sleeves were all installation induced. Nine service induced indications in SGA in the B&W kir. etic sleeves were found and repaired.

ANO-2 utilizes N-16 monitors for primary-to-secondary leakage detection, and has an administrative leakage limit of 0.1 GPM (144 GPD). Abnormal operating procedures are in place for both Operations and Chemistry in the event that leakage is detected. Other leakage monitors include condenser off-gas radiation monitor, steam generator blowdown monitor, main steam line radiation monitors, in addition to the utilization of blowdown grab samples.

Entergy Operations is sensitive to the potential rapid progression of tube leakage and will take

U. S. NRC l

June 5,1997 l.

4 2CAN069705 Page 10 1~

the necessary measures upon detection, should a primary-to-secondary leak occur.

Operations routinely trains on primary-to-secondary leaks and tube ruptures utilizing the simulator. Entergy Operation's aggressive response to tube leakage was demonstrated last Fall, when ANO-2 was shutdown due to primary-to-secondary leakage of 50 GPD (well below the ANO-2 TS limit of 0.5 GPM through any one SG).

Based upon the comprehensive actions performed during 2R12 in conjunction with the ability to rapidly detect and respond to any primary-to-secondary leakage, as described above, Entergy Operations believes ANO-2 is safe to resume plant opersticn.

l Based upon the results of the 2R12 and previous inspections, T,ntergy Operations plans to conduct a midcycle inspection during the upcoming cycle of operation. The date of this l

inspection will be determined based upon further evaluation of 2R12 inspection data.

l l

Should you have any questions regarding this submittal, please contact me.

Ve truly yours, V

~

wigh ms Dire or, uclear Safety l

l DCN d attachment ec:

U. S. Nuclear Regulatory Commission Document ControlDesk Mail Station OP1-17 Washington, DC 20555 NRC Senior Resident Inspector '

Arkansas Nuclear One P.O. Box 310 London, AR 72847 Mr. George Kalman NRR Project Manager Region IV/ANO-1 & 2 U. S. Nuclear Regulatory Commission NRR Mail Stop 13-H-3 One White Flint North 11555 Rockville Pike l

Rockville, MD 20852

)

Attachment to 2CAN069705' Page1of20 1

TABLE 1 (SGA PLUG LIST FOR 2R12)

No. Row Line Reason for Plus 1

20 2

Sludge Pile Axial 2

23 5

TTS Circ 3

16 10 EC VOL 4

14 14 EC Axial l

5 8

16 EC Axial l

6 41 23 TTS Circ 7

15 25 TTS Cire 8

58 28 EC Axial 9

9 29 EC VOL 10 58 30 E C A xial 11 96 30 BW VOL 12 13 31 TTS Cire 13 20 32 TTS Circ 14 9

33 EC VOL 15 19 33 TTS Cire 16 24 34 TTS Circ 17 34 34 EC AxialffTS VOL 18 38 34 TTS VOL 19 74 34 TTS Circ 20 15 35 TTS Cire l

21 45 35 TTS VOL 22 20 36 EC Axial l

23 33 37 TTS Circ 24 52 38 TTS VOL 25 58 38 EC Axial 26 66 38 BW VOL 27 70 38 Sludge Pile VOL 28 78 38 TTS Circ 29 45 39 TTS Circ 30 46 40 TTS VOL 31 7

41 TTS Circ 32 58 42 TTS VOL 33 86 42 Freespan/PTP 34 65 43 TIG Sleeve (WZI)/BW Axial 35 89 43 TTS VOL l

36 20 44 EC Axial 37 50 44 EC Axial 38 98 44 Freespan/PTP 39 5

45 Freespan Axial 40 37 45 EC Axial 41 43 45 TTS VOL

Attachment to l

2CAN069705 l

, Page 2 of 20 TABLE 1 (SGA PLUG LIST FOR 2R12) h Row Line Reason for Plus i

)

42 53 45 TTS VOL 43 87 45 TTS Circ 44 91 45 PTP-45 30 46 ITS Circ 46 98 46 EC VOL 47 3

47 Freespan Axial 48 21 47 EC Axial 49 33 47 EC VOL 50 30 48 EC VOL 51 32 48 EC VOL 52 11 49 Freespan Axial 53 35 49 TTS Circ 54 47 49 PTP 55 63 49 TTS Cire 56 38 50 EC Axial 57 52 50 TTS Circ 58 58 50 EC Axial 59 90 50 EC Axial 60 11 51 PTP 61 15 51 EC Axial 62 51 51 EC VOL 63 95 51 TTS Circ 64 28 52 PTP 65 36 52 PTP.

66 58 52 TTS Circ 67 5

53 TTS CircfITS Axial / Sleeve l

68 21 53 PTP 69 52 54 PTP 70 54 TTS Cire 71 71 55 EC VOL i

72 97 55 TTS Circ 73 129 55 EC VOL l

74 14 56 EC Axial 75 40 56 EC VOL 76 90 56 TTS VOL l

77 102 56 TTS Circ 78 51 57 EC VOL 79 89 57 TTS VOL i

80 91 57 TTS Axial 81 101 57 TTS VOL 82 30 58 EC Axial

Attachment to 2CAN069705

, Page 3 of 20 TABLE 1 (SGA PLUG LIST FOR 2Ri2)

No,2 Row Line Reason for Plus 83 46 58 PTP 4

84 58 58 EC Axial 85 5

59 EC Axial

86. 27 59 EC Axial 87-16 60 EC Axial 88 48 60 EC Axial 89 72 60 EC Axial 90 15 61 Sludge Pile VOL 91 29 61 EC VOL 92 30 62 EC Axial 93 34 62 EC Axial i

94 60 62 TIG Sleeve (WZI) l 95 66 62 Freespan Axial 96 86 62 EC Axial 97 35 63 E C A xial i

98 67 63 TTS Circ 99 81 63 EC Axial l

100 48 64 PTP j

101 50 64 Sludge Pile Axial 102 70 64 Freespan VOL 103 39 65 EC VOL 104 48 66 TTS Axial 105 62 66 Sludge Pile Axial 106 78 66 TTS VOL 107 41 67 EC VOL l

108 53 67 PTP l

109 65 67 TIG Sleeve (WZI) 110 111 67 Frecspan 111 84 68 Freespan l

112 101 69 Freespan 113 117 69 TTS Circ 114 30 70 EC Axial 115 44 70 Freespan Axial 116 66 70 TTS Cire 117 45 71 TTS Circ 118 47 71 EC Axial 119 57 71 EC Axial 4

120 112 72 TTS Circ 121 41 73 EC Axial

[.

122 53 73 EC VOL 123 61 73 Freespan Axial

Attachment to l

2CAN069705 Page 4 of20 TABLE 1 (SGA PLUG LIST FOR 2R12)

No. Row Line Reason for Plue l

124 115 73 TTS Circ 125 34 74 Freespan Axial l

126 110 74 Sludge Pile MMI l

127 87 75 TTS VOL l

128 99 75 TTS Circ 129 40 76 EC Axial l

130 48 76 EC VOL 131 64 76 Freespan Axial j

132 93 77 EC Axial 133 107 77 TTS Cire 134 58 78 EC Axial 135 74 78 TTS Circ 136 106 78 Freespan l

137 108 80 PTP 138 65 81 TTS Circ 139 111 81 TTS Circ 140 42 82 EC Axial 141 86 84 EC Axial 142 47 85 EC Axial 143 49 85 EC Axial i

144 53 85 EC Axial 145 111 85 TTS Circ l

146 62 86 EC VOL I

147 78 86 Freespan 148 88 86 EC Axial 149 124 86 Freespan VOL 150 73 87 Freespan Axial l

151 81 87 TTS Cire / Sludge Pile Axial 152 $0 88 EC Axial l

153 82 88 Sludge Pile Axial i

154 94 88 EC VOL 155 41 89 EC Axial /EC VOL l

156 49 89 EC Axial 157 51 89 EC Axial 158 55 89 Freespan VOL 159 109 89 TTS Circ 160 62 90 EC Axial l

161 94 90 EC VOL 162 98 90 TIG Sleeve (WZl) 163 51 91 Freespan Axial 164 40 92 EC Axial i

Attachment to 2CAN069705

, Page 5 of20 TABLE 1 (SGA PLUG LIST FOR 2R12)

No. Row Line Reason for Plur l

l 165 46 92 EC Axial l

166 60 92 EC Axial 167 78 92 EC Axial 168 116 92 EC Axial 169 47 93 EC Axial 170 49 93 Freespan Axial l

171 61 93 EC Axial 172 69 93 TTS Cire / TTS Axial 173 101 93 PTP 174 113 93 PTP 175 115 93 TTS Circ 176 46 94 EC Axial 177 52 94 Freespan Axial 178 86 94 EC VOL 179 100 94 EC VOL 180 47 95 EC Axial 181 55 95 EC Axial /Freespan Axial 182 59 95 EC Axial 183 71 95 TIG Sleeve (WZI) 184 75 95 EC Axial l

185 91 95 TTS VOL l

186 95 95 EC VOL l

187 42 96 EC VOL l

188 46 96 Freespan Axial l

189 64 96 EC VOL 190 106 96 Sludge Pile Circ 191 122 96 EC VOL 192 46 98 EC Axial l

193 56 98 EC Axial 194 66 98 EC Axial /Freespan Axial 195 116 98 TTS Cire l

196 122 98 Freespan Axial 197 69 99 Freespan Axial 198 87 99 Freespan VOL 199 89 99 Freespan VOL 200 52 100 EC Axial 201 35 101 Freespan Axial 202 37 101 Freespan Axial 203 125 101 EC VOL 204 32 102 EC Axial 205 49 103 EC Axial

Attachment to 2CAN069705

, Page 6 of 20 TABLE 1 (SGA PLUG LIST FOR 2R12)

No. Row Line Reason for Plum 206 59 103 EC VOL 207 69 103 TTS Circ l

208 79 103 EC VOL/Freespan VOL l

209 91 103 VOLin DTSP 210 103 103 VOLinDTSP l

211 127 103 EC Axial l

212 28 104 EC Axial 213 64 104 EC VOL 214 66 104 TTS Circ 215 57 105 EC VOL 216 89 105 Freespan Ax/Freespan VOL 217 119 105 VOLin DTSP 218 24 106 Sludge Pile Axial 219 30 106 Sludge Pile Axial 220 66 106 PTP 221 102 106 Sludge Pile Circ 222 71 107 EC Axial 223 101 107 PTP 224 103 107 PTP 225 113 107 TIG Sleeve (WZI) 226 10 108 EC Axial 227 12 108 Freespan Axial l

228 34 108 TTS VOUEC Axial 229 38 108 EC Axial l

230 55 109 EC Axial 231 50 110 EC Axial l

232 68 110 EC VOL l

233 %

110 EC VOL l

234 19 111 TTS Axial l

235 33 111 TTS Circ 236 45 111 TTS Circ 237 47 111 EC Axial 238 59 111 TTS Circ 239 2

112 TTS Circ 240 28 112 PTP 241 30 112 PTP 242 60 112 TTS Circ 243 70 112 TTS VOL 244 17 113 TTS VOL 245 19 113 EC Axial 246 47 113 BW Axial

Attachment to 2CAN069705'

, Page 7 of 20 TABLE 1 (SGA PLUG LIST FOR 2R12)

& Row Line Reason for Plur 247 24 114 PTP 248 40 114 Freespan Axial 249 54 114 EC Axial 250 70 114 EC Axial 251 63 115 TTS VOL 252 65 115 EC VOL 253 81 115 Freespan VOL 254 101 115 TIG Sleeve (WZI) 255 60 116 EC Axial 256 70 116 EC Axial 257 72 116 EC Axial 258 76 116 EC Axial 259 51 117 EC Axial 260 57 117 EC VOL 261 113 117 VOLin DTSP 262 40 118 EC Axial 263 46 118 EC Axial 264 66 118 EC VOL 265 68 118 TTS VOL 266 82 118 EC Axial 267 %

118 Sludge Pile Axial / Circ 268 120 118 EC VOL 269 13 119 EC Axial 270 37 119 TTS Circ 271 67 119 EC Axial 272 106 120 Freespan VOL 273 45 121 PTP 274 97 121 Sleeve Circ 275 8

122 Freespan Axial 276 10 122 EC Axial 277 62 122 EC VOL 278 73 123 TTS VOL 279 24 124 TTS Circ 280 48 124 EC Axial 281 7

125 EC Axial 282 41 125 TTS Circ /EC Axial 283 65 125 EC Axial 284 91 125 EC Axial 285 26 126 TTS Circ 286 34 126 TTS Circ 287 44 126 EC VOL

. - - =_ ---

Attachment to l

2CAN069705 Page 8 of 20 l

TABLE 1 (SGA PLUG LIST FOR 2R12)

Na Row Ligg Reason for Plum 288 50 126 EC Axial 289 9

127 PTP-290 31 127 PTP-291 35 127 Sludge Pile Cire / Axial 292 51 127 EC Axial 293 10 128 TIG Sleeve (WZI) 294 52 128 EC Axial 295 66 128 EC Axial 296 %

128 EC VOL 297 9

129 TIG Sleeve (WZI) 298 13 129 TTS VOL 299 29 129 PTP 300 47 129 EC Axial /VOL 301 63 129 EC Axial 302 38 130 EC Axial 303 68 130 EC Axial 304 7

131 EC Axial 305 87 131 EC Axial 306 101 131 Freespan Axial 307 28 132 EC Axial 308 60 132 EC Axial 309 70 132 EC Axial l

310 78 132 EC VOL I

311 10 134 EC Axial /VOL 312 18 134 EC Axial /VOL 313 38 134 EC Axial 314 46 134 EC VOL 315 19 135 TTS Cire 316 61 135 EC VOL 317 63 135 TTS Cire 318 16 136 TTS Cire l

319 18 136 TTS Circ l

320 50 136 TTS Cire 321 45 137 TTS Cire 322 2

138 EC Axial 323 10 138 EC Axial 324 12 138 TTS VOL 325 26 138 EC Axial 326 28 138 EC Axial 327 62 138 Sleeve Cire 328 84 138 EC Axial

Attachment to 2CAN069705 Page 9 of 20 TABLE 1 (SGA PLUG LIST FOR 2R12) 1

& Row Mag Reason for Plue l

4 329 42 140 TTS Circ 330 74 140 Freespan Axial i

I 331 24 142 TTS Circ 332 30 142 EC Axial 333 38 142 EC Axial 334 27 143 EC Axial 335 71 143 EC Axial 336 12 144 TTS Cire 337 62 144 BW VOL 338 17 145 TTS Circ 339 14 146 TIG Sleeve (WZI) 340 17 147 EC VOL 341 23 147 TTS Circ 342 8

148 TTS Circ l

343 29 149 EC Axial 344 15 151 EC Axial 345 19 153 EC Axial 346 16 154 TTS Cire i

347 38 154 EC Axial 348 11 155 EC Axial 349 19 163 EC VOL 350 18 166 EC Axial Legend:

BW - Batwing Stabilizer DTSP - Drilled Tube Support Plate (Partial) l EC - Egg Crate Support MMI-Mixed Mode Indication l

PTP - Preventative Tube Plug TTS - Top ofTube Sheet VOL - VolumetricIndication l

WZI-Weld Zone Indication (Sleeve) c

Attachment to j

2CAN069705 l.

, Page 10 of 20 l

l TABLE 2 (SGB PLUG LIST FOR 2R12)

No.

Row Line Reason for Plus l

1 60 26 BW Axial 2

71 43 BW Axial 3

25 57 BW Axial 4

59 115 BW Axial 5

40 140 BW Axial 6

38 150 BW Axial 7

24 6

BW VOL 8

35 13 BWVOL 9

27 15 BW VOL 10 69 21 BW VOL 11 24 22 BW VOL i

12 20 24 BW VOL 13 29 29 BW VOL 14 65 111 BW VOL 15 54 112 BW VOL 16 41 117 BW VOL 17 59 117 BW VOL 18 63 149 BW VOL 19 40 150 BW VOL 20 63 151 BW VOL 21 31 7

BW VOUAxial l

22 24 14 BW VOUAxial i

23 25 9

BW VOUWear I

24 135 81 BW VOUWear 25 107 39 DTSP Axial 26 110 40 DTSP Axial 27 7

17 EC Axial 28 11 19 EC Axial 29 8

22 EC Axial 30 20 22 EC Axial 31 1

25 EC Axial 32 30 26 EC Axial 33 12 28 EC Axial 34 79 31 EC Axial 35 30 32 EC Axial 36 36 32 EC Axial 37 7

33 EC Axial 38 22 34 EC Axial 39 78 34 EC Axial i

40 63 35 EC Axial 41 76 36 EC Axial I

I

Attachment to 2CAN069705 l.

, Page 11 of 20 l

TABLE 2 (SGB PLUG LIST FOR 2R12) l h

Row Line Reason for Plus l

42 34 38 EC Axial l

43 36 40 EC Axial 44 52 40 EC Axial 45 97 41 EC Axial l

46 62 42 EC Ax3al 47 74 42 EC Axia!

48 61 43 EC Axial 49 75 43 EC Axial 50 27 45 EC Axial 51 69 45 EC Axial 52 20 48 EC Axial 53 74 48 EC Axial 54 75 49 EC Axial 55 79 49 EC Axial 56 34 50 EC Axial 57 74 50 EC Axial 58 63 51 EC Axial 59 65 51 EC Axial 60 73 51 EC Axial 61 76 52 EC Axial 62 7

53 EC Axial 63 15 53 EC Axial 64 73 53 EC Axial 65 79 53 EC Axial 66 60 54 EC Axial 67 66 54 EC Axial 68 7

55 EC Axial 69 9

55 EC Axial 70 27 55 EC Axial 71 67 55 EC Axial 72 16 56 EC Axial 73 30 56 EC Axial 74 60 56 EC Axial 75 7

57 EC Axial 76 95 57 EC Axial 77 44 58 EC Axial 78 62 58 EC Axial 79 68 58 EC Axial 80 11 59 EC Axial 81 25 59 EC Axial l

82 12 60 EC Axial l

_ ~.

Attachment to 2CAN%9705 Page 12 of 20 l

TABLE 2 (SGB PLUG LIST FOR 2R12)

No.

Row Line Reason for Plur 33 68 60 EC Axial 84 23 61 EC Axial 85 38 62 EC Axial 86 C4 62 EC Axial 87 98 62 EC Axial 88 22 6t EC Axial l

89 60 64 EC Axial 90 23 65 EC Axial 91 30 66 EC Axial 92 68 66 EC Axial 93 98 66 EC Axial 94 37 67 EC Axial 95 108 68 EC Axial 96 85 69 EC Axial 97 34 70 EC Axial 98 46 70 EC Axial l

99 62 70 EC Axial 100 70 70 EC Axial 101 100 70 EC Axial 102 35 71 EC Axial 103 37 71 EC Axial 104 75 71 EC Axial 105 79 71 EC Axial L

106 34 72 EC Axial l

107 36 72 EC Axial 108 38 72 EC Axial 109 84 72 EC Axial 110 45 73 EC Axial i

111 63 73 EC Axial 112 107 73 EC Axial i

113 101 75 EC Axial 114 36 76 EC Axial 115 60 76 EC Axial 116 73 77 EC Axial 117 44 78 EC Axial 118 74 78 EC Axial l

119 61 79 EC Axial 120 79 79 EC Axial 121 93 79 EC Axial 122 92 80 EC Axial 4

123 124 82 EC Axial t

Attachment to i

2CAN069705 l,

Page 13 of 20 TABLE 2 (SGB PLUG LIST FOR 2R12)

No.

Row Line Reason for Plur 124 69 83 EC Axial i

125 58 84 EC Axial 126 84 84 EC Axial 4

l 127 86 84 EC Axial' 128 43 85 EC Axial l

129 46 86 EC Axial 130 86 86 EC Axial 131 44 88 EC Axial 132 92 88 EC Axial 133 133 89 EC Axial 134 92 90 EC Axial 135 53 91 EC Axial 136 55 91 EC Axial 137 73 93 EC Axial 138 52 96 EC Axial 139 74 96 EC Axial 140 43 97 EC Axial 141 36 98 EC Axial 142 41 99 EC Axial 143 65 99 EC Axial 144 48 100 EC Axial 145 106 100 EC Axial 146 24 102 EC Axial 147 50 102 EC Axial 148 80 102 EC Axial 149 82 102 EC Axial 150 33 103 EC Axial l

151 24 104 EC Axial 152 32 104 EC Axial 153 50 104 EC Axial 154 58 104 EC Axial 155 60 104 EC Axial 156 64 104 EC Axial 157 76 104 EC Axial 158 43 105 EC Axial 159 51 105 EC Axial 160 9

107 EC Axial 161 23 107 EC Axial 162 22 108 EC Axial 163 104 108 EC Axial l

164 1

109 EC Axial l

l t

L '

Attachment to 2CAN069705

, Page 14 of 20

~.

TABLE 2 (SGB PLUG LIST FOR 2R12) h Row Line Reason for Plum 165 7

109 EC Axial 166 19 109 EC Axial 167 75 109 EC Axial 168 16 110 EC Axial 169' 34 110 EC Axial 170 52 110 EC Axial 171 9

111 EC Axial 172 13 111 EC Axial 173 27 111 EC Axial 174 12 112 EC Axial l

175 44 112 EC Axial 176 58 112 EC Axial 177 17 113 EC Axial 178 62 114 EC Axial 179 14 116 EC Axial 180 32 116 EC Axial 181 62 116 EC Axial 182 68 116 EC Axial 183 128 116 EC Axial 184 5

117 EC Axial 185 9

117 EC Axial 186 19 117 EC Axial 187 43 117 EC Axial 188

'12 118 EC Axial 189 14 118 EC Axial 190 62 118 EC Axial 191 98 118 EC Axial 192 120 118 EC Axial 193 5

119 EC Axial 194 15 119 EC Axial 195 31 119 EC Axial 196 14 120 EC Axial 197 20 120 EC Axial 198 44 120 EC Axial 199 60 120 EC Axial l

200 62 120 EC Axial 201 88 120 EC Axial 202 13 121 EC Axial 203 8

122 EC Axial 204 24 122 EC Axial

{

205 58 122 EC Axial L

i

l Attachment to 2CAN069705 Page 15 of 20 TABLE 2 (SGB PLUG LIST FOR 2R12)

No.

Row Line Reason for Plur 206 62 122 EC Axial 207 76 122 EC Axial l

208 9

123 EC Axial 209 11 123 EC Axial 210 8

124 EC Axial 211 24 124 EC Axial 212 64 124 EC Axial l

213 24 126 EC Axial 214 102 126 EC Axial 215 3

127 EC Axial 216 25 127 EC Axial 217 43 127 EC Axial 218 16 128 EC Axial 219 26 128 EC Axial 220 36 128 EC Axial l

221 5

129 EC Axial 222 11 129 EC Axial j

223 15 129 EC Axial l

224 59 129 EC Axial 225 16 130 EC Axial 226 38 130 EC Axial 227 62 130 EC Axial 228 32 132 EC Axial 229 1

133 EC Axial 230 14 134 EC Axial 231 16 134 EC Axial 232 30 134 EC Axial 233 20 136 EC Axial 234 61 137 EC Axial 1

235 105 137 EC Axial 236 12 140 EC Axial 237 27 141 EC Axial 238 10 142 EC Axial 239 26 142 EC Axial 240 38 142 EC Axial 241 27 143 EC Axial 242 47 143 EC Axial i

243 12 144 EC Axial i

244 56 144 EC Axial 245 9

145 EC Axial l

246 8

146 EC Axial

\\

Attachment to 2CAN069705 Page 16 of 20 TABLE 2 (SGB PLUG LIST FOR 2R12)

No.

Row Line Reason for P!ur 247 1

147 EC Axial l

248 19 147 EC Axial l

249 33 147 EC Axial l

250 20 148 EC Axial l

251 9

149 EC Axial l

252 34 150 EC Axial 253 10 162 EC Axial 254 42 6

EC VOL 255 49 51 EC VOL l

256 30 52 EC VOL 257 17 57 EC VOL 258 36 60 EC VOL 259 79 63 EC VOL 260 25 65 EC VOL 261 34 68 EC VOL 262 81 69 EC VOL 263 32 72 EC VOL 264 98 72 EC VOL 265 51 73 EC VOL 266 85 77 EC VOL 267 122 84 EC VOL 268 77 85 EC VOL 269 48 102 EC VOL 270 89 111 EC VOL 271 32 112 EC VOL 272 102 118 EC VOL 273 83 27 Freespan Axial 274 138 96 Freespan Axial 275 69 17 Freespan VOL j

276 66 56 Freespan VOL 277 121 49 PTP 278 42 56 PTP 279 130 56 PTP 280 72 138 PTP 281 70 74 Sludge Pile Axial 282 76 96 Sludge Pile Axial 283 50 100 Sludge Pile Axial l

284 46 114 Sludge Pile Axial i

285 14 130 Sludge Pile Axial 286 96 72 Sludge Pile Circ 287 75 151 Sludge Pile VOL i

-. ~ = ~

= - - _ _ _. - _. - - - -. _ -. -

Attachment to 2CAN069705

, Page 17 of20 TABLE 2 (SGB PLUG LIST FOR 2R12)

No.

Row Line Reason for Plue 288 76 152 Sludge Pile VOL 289 28 42 TIG Sleeve (WZI) 290 53 43 TIG Sleeve (WZI) 291 80 44 TIG Sleeve (WZI) 292 100 56 TIG Sleeve (WZI) 293 109 73 TIG Sleeve (WZI) 294 100 78 TIG Sleeve (WZI) 295 107 81 TIG Sleeve (WZI) 296 90 124 TIG Sleeve (WZI) 297 26 146 TIG Sleeve (WZI) 298 26 148 TIG Sleeve (WZI) 299 120 42 TTS Axial 300 129 53 TTS Axial 301 68 74 TIS Axial 302 73 95 TTS Axial 303 125 101 TTS Axial 304 42 106 TTS Axial 305 18 112 TTS Axial 306 66 76 TIS Axial /EC VOL 307 14 20 TfS Circ 308 19 21 TTS Circ 309 33 25 TTS Circ 310 62 38 TTS Circ 311 77 39 TfS Circ 312 72 40 TTS Cire 313 81 41 TTS Cire i

314 95 41 TTS Cire 315 56 42 TTS Cire 316 88 48 TTS Cire 317 57 4fi ITS Cire 318 91 51 TTS Cire 319 25 f,3 TTS Circ 320 83 53 TTS Circ 321 98 56 TTS Cire 322 72 58 TTS Circ 1

323 99 59 TTS Cire 324 47 65 TTS Cire 325 106 66 TTS Circ 326 108 66 TTS Cire 327 84 70 TTS Circ 328 116 70 TTS Circ IL

Attachment to 2CAN069705 Page 18 of 20 TABLE 2 (SGB PLUG LIST FOR 2R12)

No.

Row Line Reason for Plus 329 105 71 TTS Circ 330 109 71 TTS Cire 331 81 75 TTS Cire 332 91 75 TTS Cire 333 99 91 TTS Circ 334 102 92 TTS Cire 335 37 93 TTS Circ 336 79 97 TTS Circ 337 93 97 TTS Cire 338 86 100 TTS Circ 339 109 101 TTS Cire 340 112 102 TTS Circ 341 111 105 TTS Circ 342 100 108 TTS Cire 343 87 117 TTS Cire 344 57 123 TTS Cire 345 95 123 TTS Circ 346 56 124 TTS Circ 347 58 124 TTS Circ 348 4

128 TTS Cire 349 13 129 TTS Cire 350 12 134 TTS Cire 351 15 135 TTS Circ 352 42 136 TTS Circ 353 20 138 TTS Cire 354 15 141 TTS Circ 355 16 146 TTS Cire 356 27 147 TTS Circ 357 15 149 TTS Cire 358 68 120 TTS Circ /EC Axial 359 11 131 TTS CircEC Axial 360 87 73 TTS VOL 361 88 110 TTS VOL 362 89 117 TTS VOL 363 64 70 TTS/EC Axial 364 82 90 TTS/EC Axial j

365 138 76 VOLin DTSP j

366 136 96 VOLin DTSP l

f

- -...._. -=_ ~._.. -,

Attachment to 2CAN069705 Page 19 of 20

~'

TABLE 2 (SGB PLUG LIST FOR 2R12)

Lenend:

BW - Batwing Stabilizer DTSP - Drilled Tube Support Plate (Partial)

EC - Egg Crate Support MMI-Mixed Mode Indication PTP - Preventative Tube Plug TTS - Top ofTube Sheet VOL - VolumetricIndication WZI-Weld Zone Indication (Sleeve) g l

1

l -'

Attachment to 2CAN069705 Page 20 of 20

+

TABLE 3 2R12 TUBES REPAIRED BASED ON FLAW LOCATION.

LOCATION SGA S_QB '

Hot Leg ET Region 66 53 (circumferential) t l

Sludge Pile 31 21 l

Cold Leg ET Region 0

0 l

(circumferential)

EC Support Plate 166 246 BW Support 4

24 Drilled Support Plate 4

4 Sleeved Tubes (Kinetic) 9 0

(TIG) 9 10 i

Free-Span 38 4

l Tube Sheet Below Sleeves 0

0 Miscellaneous 23 4

Total 350 366 1

I