SBK-L-08102, Response to Request for Additional Information Related to Steam Generator Inspections Performed During the Eleventh Refueling Outage

Response to Request for Additional Information Related to Steam Generator Inspections Performed During the Eleventh Refueling Outage

ML081750527
Person / Time
Site:	Seabrook
Issue date:	06/18/2008
From:	St.Pierre G Florida Power & Light Energy Seabrook
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
SBK-L-08102, TAC MD2791
Download: ML081750527 (41)

Text

FPL Energy Seabrook Station FPL Energy P.O. Box 300 Seabrook, NH 03874 Seabrook Station (603) 773-7000 June 18, 2008 SBK-L-08102 Docket No. 50-443 U.S. Nuclear Regulatory Commission Attn: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 Seabrook Station Response to Request for Additional Information Related to Steam Generator Inspections Performed During the Eleventh Refueling Outage

References:

1. FPL Energy Seabrook letter to NRC, Steam Generator Inservice Inspection, dated May 23, 2007.

2. NRC letter to FPL Energy Seabrook, Summary of Conference Call and Request for Additional Information Regarding the Fall 2006 Steam Generator Inspections (TAC No. MD279 1), dated March 7, 2008.

In Reference 1, FPL Energy Seabrook, LLC (FPL Energy Seabrook) provided the Steam Generator Inservice Inspection Report for the Seabrook Station eleventh refueling outage. In Reference 2, the NRC provided a request for additional information (RAI) related to the Seabrook Station Steam Generator Inspection Report. The attachment to this letter provides the FPL Energy Seabrook response to the RAI.

Should you have any questions regarding the response to the RAI, please contact Mr. Paul R.

Willoughby at (603) 773-7350.

Sincerely, Gene St. Pierre Site Vice President cc:

S.J. Collins, NRC Region I Administrator G.E. Miller, NRC Project Manager, Project Directorate 1-2

/-40 W.J. Raymond, NRC Senior Resident Inspector an G

an FPL Group company

Attachment to SBK-L-08102

Attachment Response to Request for Additional Information Related to Steam Generator Inspections Performed Durin2 the Eleventh Refueling Outage RAI 1. For each refueling outage or SG inspection outage, since the beginning of the second inspection interval, please provide the cumulative effective full power months (or years) of operation that the SGs had accumulated at the time of the outage.

FPL Energy Response 1:

The second interval for Seabrook Station is 90 EFPM. The start of the second interval was at the beginning of cycle 9. The inspection closest to the midpoint where 50% of the tubes are required to be inspected corresponds to OR11 at 49.1 EFPM. The last inspection in the interval will be in OR13 at 82.7(est.) EFPM.

Table 1 Year 2003 2005 2006 2008 2009 Refuel OR09 OR10 ORll OR12 OR13 SG -

Bobbin 100%

0%

100%

0%

100%

A

+PointTMRl/2 U-bend 20%

30%

50%

+PointTM>5volt 20%

30%

50%

Ding/Dent 50%

50%

+PointTM OXP/BLG SG-Bobbin 100%

0%

100%

0%

100%

B

+PointTMR1/2 U-bend', 20%

30%

50%

+PointTM>5volt 20%

30%

50%

Ding/Dent 50%

50%

+PointTM OXP/BLG SG -

Bobbin 100%

0%

100%

0%

100%

C

+PointTMRl/2 U-bend 20%

30%

50%

+PointTM>5volt 20%

30%

50%

Ding/Dent 50%

50%

+PointTM OXP/BLG SG -

Bobbin 100%

0%

100%

0%

100%

D

+PointTMR1/2 U-bend 20%

30%

50%

+PointTM>5volt 20%

30%

50%

Ding/Dent 50%

50%

+PointTM OXP/BLG EOC 9

10 11 12 13 EFPM 15.5 32.3 49.1 65.9 82.7 Est.

Interval Interval 2 (90 EFPM)

Attachment Page 1 of 39

RAI 2. In the May 23, 2007, letter, Table 1 identifies SG B, tube R27C97 (Row 27, Column 97) as having been plugged in OR1l due to potentially elevated residual stress.

In previous letters dated October 12, 2004 (ADAMS accession No. ML042940501), and October 26, 2006, you indicated SG B, tube R29C97 as having potentially elevated residual stress that would result in plugging in ORll. Please Clarify which tube was plugged and which tube had the elevated residual stress.

FPL Energy Response 2:

The tube that was plugged administratively for potential elevated residual stress in Steam Generator B was R29C97. This was verified from the ORI 1 Degradation Assessment, Plugging Records, the 15 day plugging report, and the original study that was performed for elevated residual stress levels. Tube R27C97 is currently in operation. Tube R27C97 does not have elevated residual stresses. The information in the May 23, 2007 letter was a typographical error.

RAI 3. Please provide the scope and results of any secondary side inspections (including foreign object search and retrieval) performed in ORil.

FPL Energy Response 3:

Foreign Object Search and Retrieval (FOSAR) was performed in all four Steam Generators. The Foreign Object search consists of visual inspection in the tube annulus area and the tube lane. In SG-A, three foreign objects were successfully removed. In SG-B, two foreign objects were located and removed. In SG-C, two foreign objects were successfully removed. At R3 IC 11 in SG-C, a "dumbbell"-

shaped foreign object has been resident since OR01 and was visually verified as remaining fixed in place. No foreign objects were observed in SG-D. at ORI 1.

No other secondary side inspections were performed in ORI 1. See Table 2 below.

Inspections of the tube support plate quatrefoils have been implemented in previous refueling outages using the Upper Bundle In Bundle (UBIB) tool. Those inspections showed insignificant blockage in the tube support plate quatrefoil area. In addition, Seabrook has started Advanced Scale Conditioning Agent (ASCA) treatment to reduce the total scale loading in the steam generators. In OR12, a full bundle copper ASCA was performed.

Attachment Page 2 of 39

Table 2 Foreign Objects Description Location Dimension Comment LxHxW SG A Gasket TTS

.5x.18x.01 Removed Material R55C64 CL SG A Socket Head TTS

.292x.125x.125 Removed Screw R17C59 HL SG A Metal Tie TTS

.3x.18x.05 Removed Wrap R19C59 HL SG B Twisted TTS lx.062x.062 Removed Wire R40C 18 HL SGB Scale TTS 2x.125x.125 Removed -upon R55C removing it was scale SG C Wire TTS 3x. 125x. 125 Removed -laying R60C59 in annulus HL SG C Gasket TTS 2x.18x.01 Removed Material R51C91

__ HL Notes: R=Row; C=Column, CL=Cold Leg side, HL = Hot Leg side, all dimensions are in inches.

RAI 4. With respect to the inspections performed in the u-bend region of the tubes in row one and two, and at dings and dents whose voltage exceeds five volts, please discuss whether 50 percent of these locations have been inspected since the start of the 90 effective full power month period.

FPL Energy Response 4:

As shown in the Table 1 in RAI Response 1, 50% of the row one and row two u-bends, and dings/dents >5 volts were completed by the outage closest to the midpoint at 49.1 EFPM, with the actual midpoint being 45 EFPM. There were two inspection outages during the first half of the second interval. 20% of the row one and two were inspected in the first inspection outage and 30% were inspected in the second inspection outage. The dings/dents were inspected by the same percentages.,

Attachment Page 3 of 39

RAI 5. Regarding the tubes in SG C with foreign object wear and the surrounding tubes, please identify those which were plugged and also stabilized. If plugged and not stabilized, discuss how the condition of these tubes will be monitored or why no monitoring is necessary.

FPL Energy Response 5:

In SG-C, (see Sketch 1) two tubes reported with possible loose parts (PLPs) were also found to have wear of 48% (R59C57) through wall depth (TWD) and 39%

(R58C54) TWD at just above the flow distribution baffle on the cold leg of the SG. Both of these tubes were plugged. The tubes surrounding these locations were inspected by RPC in order to "box" in the location of tubes potentially affected by wear degradation.

Since the location of these tubes is inaccessible with the current secondary side retrieval tooling, all of the surrounding tubes were also plugged, in lieu of stabilizing R59C57 and R58C54, to bound the potential for adjacent tubes to be affected (also see response to RAI 7)

The observed degradation suggests a linear object lying on the flow distribution baffle. A postulated tube severance from a linear object is considered extremely unlikely; nevertheless, a postulated severed tube is constrained from further propagation by the surrounding tubes that were plugged. If R59C57 and R58C54 become severed, presumed flow induced oscillations may result in wear scars on the adjacent tubes. Postulated wear on the adjacent plugged tubes would be limited to the surface exposed to the postulated oscillating tubes and result in an essentially axially oriented defect. Axially oriented defects are unlikely to lead to tube separation; therefore further propagation of postulated wear damage to adjacent plugged tubes in the unlikely event that R59C57 anad R58C54 become separated is expected to be limited in extent such that separation of adjacent plugged tubes is prevented RAI 6 The May 23, 2007, submittal does not appear to provide the location and percentages of wall thickness for indications with an imperfection.

Specifically, it appears that this information is not provided for wear at the anti-vibration bars and wear flow distribution baffle (FDB). Please provide this information for all imperfections.

FPL Energy Response 6:

See attached Tables 3,4, 5, 6, 7, 8, 9, and 10 for the location and percentages of wall thickness for indications with an imperfection..

RAI 7. You indicated that two tubes in SG C with possible loose part (PLP) signals could not be accessed for removal of the foreign object. Since both of these tubes are in the periphery of the tube bundle, please discuss the location of the indications and the challenges in removing any PLPs at these locations.

Attachment Page 4 of 39

FPL Energy Response 7:

The Flow Distribution Baffle (FDB) is a partial support that is similar. in shape to a "doughnut", in that there is a cut out ini the center region and located 20,38 inches above the top of the tubesheet. The location of the PLPsis at the periphery and onthe top side of the FDB. The periphery of the FDB also butts up against the. inside surface of the wrapper barrel, which prevents access from the four hand holes access openings below the FDB. The location of the PLPs was also a significant distance from the two6..hand hole access openings located just above the FDB for accessing the top of the FDB.

In order to articulate an inspection probe to the PLP location, the probe (which can not support itself) would have to traverse an open cutout area of the FDB, then turn 90 degrees, again traversing another open area prior to coming back onto the FDB. In addition, the area between the tubes and the wrapper barrel was very narrow at some points along the periphery, which could cause the probe to become lodged in the steam generator.

Therefore, it was not possible to visually confirm the nature of the PLP, and was necessary to rely on the eddy current information. (see response to RAI 5 also)

RAI 8. Please discuss how pressure pulse cleaning caused indications at the FDB.

In addition, discuss the purpose of the pressure pulse cleaning.

The Pressure Pulse Cleaning (PPC) System is a high-pressure gas cleaning and filtration process that is performed inside the secondary side of recirculation steam generators.

The sudden release of gas through the PPC nozzles causes the mass of water in the steam generator to move upward and act as a washing action to dislodge sludge deposits from the steam generator tubes and support surfaces.

A combination of, the water displacement, pressure wave, and attendant vibration loosens and removes corrosion deposits by utilizing the tubesheet, cleaning and filtration system.

The PPC process consists of introducing pressure pulses in approximately ten second intervals by means of pressure pulsers externally mounted to the hand holes and remotely controlled from the control trailer outside containment. These pressure pulsers provide for a sudden release of gas underwater. The gas expands rapidly causing a virtually instantaneous upward movement of the incompressible mass of water within the steam generator. These pulses are transmitted throughout the tube bundle and the expansion and rising of the gas bubbles produces a washing action throughout. The repetitive action of the pulsations dislodges sludge deposits, which are removed by the filtration system.,

Because the pulsers are located near the FDB, the pulsations cause a small relative displacement of structural components and/or tubes that has resulted in minor wear on the tubes at Seabrook and at other operating plants. Consistent with industry guidelines, these wear indications have been retested at subsequent inspections and have been found not to increase in depth. At Seabrook, these indications have been tracked since OR04 and OR05 when PPC was applied to the SGs.

Attachment Page 5 of 39

SKETCH 1 R5 000@000

'000@000000000 R5 0000@@0@@0000 FR1 0000000000000 Bundle Centerline 0

Tube with Wear: Plueeed O

Tube with PLP: Plu2ed 0

NDD: Plu22ed FRJ0000000000000

-a-1.......................................

I "oifol Attachment Page 6 of 39

Table 3 Seabrook ORI 1; SG-A Listing of AVB Wear Signals Row Column Percent Throughwall 17 71 17 18 58 14 19 40 23 19 54 20 19 58 20 20 48 11 23 8

12 23 36 12 23 42 18 23 45 16 23 45 12 23 52 13 23 59 18 23 59 15 24 7

14 24 7

15 24 59 19 24 59 17 24 71 10 24 71 14 25 7

19 25 8

14 25 56 17 25 59 12 26 107 25 27 12 18 27,'

63 16 27 93 11 27 112 8

28 44 15 28 59 21 28 59 20 29 11 17 29 11 10 29 71 11 29 82 21 29 82 12 29 84 13 Nominal Location AVI AV1 AV1 AV1 AVI AV1 AV1 AV1 AV6 AV5 AV6 AV2 AV2 AV5 AV1 AV6 AV2 AV5 AV2 AV5 AV1 AV1 AV2 AV2 AV6 AV6 AV2 AV1 AV5 AV2 AV2 AV5S AV2 AV6 AV2 AV2 AV6 AV5 Attachment Page'7 of 39

Row Column Percent Nominal Throughwall Location 29 94 14 AV2 30 11 10 AV1 30 11 12 AV2 30 11 18 AV5 30 11 10 AV6 30 12 17 AV1 30 12 17 AV5 30 12 16 AV6 30 31 14 AV5 30 58 21 AV5 30 58 16 AV6 30 68 17 AV1 30 68 17 AV2 30 95 11 AV6 30 109 11 AV5 30 109 13 AV6 30 111 12 AV5 31 11 17 AV2 31 11 16 AV5 31 11 18 AV6 31 12 32 AV5 31 12 18 AV6 31 13 16 AV6 31 64 14 AV2 31 68 13 AV2 31 105 10 AVI 32 89 13 AV1 32 89 18 AV3 33 14 15 AV1 33 14 10 AV2 33 15 13 AV4 33 15 22 AV5 33 15 18 AV6 33 71 11 AV1 33 71 13 AV2 33 106 8

AV1 34 17 13 AV3 34 17 14 AV6 34 31 12 AV1 34 51 16 AV2 34 51 16 AV3 34 59 18 AV3 Attachment Page 8 of 39

Row Column Percent Throughwall 34 87 12 35 14 14 35 14 11 35 14 13 35 14 16 35 14 10 35 31 12 35 31 15 35 58 21 35 58 31 35 58 32 35 58 28 35 58 20 35 58 18 35 61 12 35 61 14 35 61 14 35 61 27 35 61 25 35 61 10 35 70 13 35 73 15 36 60 14 36 60 12 36 60 13 36 81 36 36 81 25 36 81 23 36 110 9

37 18 18 37 21 16 37 21 11 37 21 11 37 87 12 37 99 11 37 102 11 37 105 10 37 105 15 38 24 15 38 28 20 39 63 15 39 63 12 Nominal Location AV3 AV2 AV3 AV4 AV5 AV6 AV3 AV5 AV1 AV2 AV3 AV4 AV5 AV6 AV1 AV2 AV3 AV4 AV5 AV6 AV2 AV2 AV2 AV4 AV5 AV2 AV3 AV4 AV2 AV5 AV2 AV3 AV4 AV2 AV3 AV5 AV1 AV4 AV3 AV2 AV2 AV3 Attachment Page 9 of 39

Row Column Percent Throughwall 39 79 14 39 79 18 39 79 24 39 79 21 39 80 17 40 30 16 40 71 20 40 86 15 40 86 16 40 86 17 40 90 13 40 90 30 40 90 25 40 90 24 40 90 36 40 90 13 40 96 10 40 102 13 40 102 15 40 103 14 40 103 19 40 103 17 41 21 13 41 21 13 41 21 11 41 35 17 41 50 10 41 50 19 41 50 18 41 50 22 41 53 16 41 53 20 41 53 18 41 53 18 41 53 19 41 54 20 41 54 21 41

• 58 11 41 58 18 41 58 17 41 58 20 41 58 16 Nominal Location AV2 AV3 AV4 AV5 AV3 AV4 AV2 AV1 AV2 AV4 AV1 AV2 AV3 AV4 AV5 AV6 AV1 AV3 AV4 AV3 AV4 AV5 AV3 AV4 AV5 AV3 AV1 AV2 AV3 AV5 AV1 AV2 AV3 AV4 AV5 AV2 AV3 AV1 AV2 AV3 AV4 AV5 Attachment Page 10 of 39

Row Column Percent Throughwall 41 59 20 41 59 17 41 59 12 41 68 19 41 68 28 41 68 23 41 68 20 41 68 13 41 78 20 41 78 17 41 78 14 41 102 12 41 102 18 41 103 13 41 103 10 41 103 16 41 103 19 42 22 13 42 26 13 42 26 11 42 26 11 42 58 25 42 58 17 42 58 14 42 72 12 42 72 19 42 72 30 42 72 14 42 72 25 42 72 11 42 80 26 42 80 26 42 80 15 42 80 15 42 80 26 42 81 21 42 103 13 43 21 13 43 21 12 43 28 14 43 55 14 43 77 25 Nominal Location AV2 AV3 AV5 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV5 AV4 AV5 AV1 AV3 AV4 AV5 AV4 AV3 AV4 AV5 AV3 AV4 AV5 AV1 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV6 AV4 AVI AV3 AV4 AV4 AV2 AV3 Attachment Page 1 I of 39

Row Column Percent Throughwall 43 77 37 43 77 35 43 77 22 43 98 18 44 94 11 44 94 16 44 98 13 44 98 19 44 98 18 44 98 14 44 98 13 44 100 14 44 101 13 44 102 13 45 67 24 45 68 18 45 74 21 45 74 21 45 74 22 45 74 31 45 76 16 45 98 12 46 26 13 46 26 15 46 28 19 46 65 23 46 65 21 46 71 12 46 71 17 46 77 14 46 77 12 46 77 17 46 94 11 46 95 17 46 95 20 46 98 19 46 98 16 46 98 13 47 26 14 47 30 17 47 31 11 47 34 13 Nominal Location AV4 AV5 AV6 AV5 AV2 AV3 AV1 AV2 AV3 AV4 AV5 AV5 AV1 AV3 AV2 AV2 AV1 AV2 AV3 AV4 AV1 AV4 AV4 AV5 AV4 AV4 AV5 AV4 AV5 AV2 AV3 AV4 AV6 AV5 AV6 AV4 AV5 AV6 AV5 AV4 AV2 AV3 Attachment Page 12 of 39

Row Column Percent Nominal Throughwall Location 47 85 22 AV5 47 89 15 AV3 47 95 10 AV1 47 95 17 AV2 47 95 16 AV3 47 95 18 AV4 47 95 14 AV5 47 95 10 AV6 47 98 13 AV5 48 31 11 AVM 48 31 12 AV2 48 31 14 AV3 48 31 11 AV4 48 31 14 AV6 48 32 15 AV4 48 60 26 AV6 48 63 15 AV1 48 63 14 AV2 48 63 20 AV3 48 63 27 AV4 48 63 18 AV5 48 64 25 AV2 48 83 21 AV4 48 94 14 AV4 48 94 14 AV6 48 95 15 AV5 48 95 20 AV6 48 96 14 AV6 49 28 23 AV2 49 30 19 AV5 49 48 11 AVl 49 57 13 AV4 49 57 11 AV6 49 60 15 AV3 49 63 15 AV2 49 63 18 AV3 49 63 19 AV4 49 63 33 AV5 49 64 23 AVl 49 65 25 AV2 49 65 25 AV3 49 65 17 AV4 Attachment Page 13 of 39

Row Column Percent Nominal Throughwall Location 49 65 11 AV5 49 67 17 AV1 49 67 29 AV2 49 67 37 AV3 49 67 32 AV4 49 67 18 AV5 49 67 19 AV6 49 76 19 AV2 49 88 27 AV3 49 88 22 AV4 49 88 26 AV5 49 88 13 AV6 50 28 13 AV2 50 28 18 AV5 50 38 18 AV4 50 38 22 AV5 50 60 15 AV2 50 60 14 AV3 50 65 16 AV3 50 65 28 AV4 50 65 18 AV5 50 66 14 AV2 50 79 32 AV3 50 79 34 AV4 50 80 12 AV3 50 80 15 AV4 50 80 14 AV5 50 85 14 AV2 50 85 26 AV3 50 85 26 AV4 50 85 18 AV5 50 85 18 AV6 50 88 25 AV6 50 95 20 AV3 50 95 21 AV4 50 95 32 AV5 50 95 26 AV6 51 53 12 AV4 51 71 14 AV4 51 75 16 AV5 51 86 19 AVI 51 86 27 AV2 Attachment Page 14 of 39

Row Column Percent Throughwall 51 86 11 51 86 19 51 90 13 51 90 20 51 90 24 51 90 11 52 53 10 52 73 17 52 88 18 52 88 31 52 88 25 52 88 19 52 89 16 52 89 26 52 89 29 52 89 28 52 90 18 53 45 21 53 45 14 53 69 10 53 90 18 54 48 16 54 86 15 55 41 19 56 57 17 56 81 20 57 52 14 57 53 13 57 61 14 58 50 17 59 58 17 Nominal Location AV3 AV6 AV3 AV4 AV5 AV6 AV2 AV5 AV3 AV4 AV5 AV6 AV3 AV4 AV5 AV6 AV6 AV2 AV3 AV5 AV4 AV1 AV2 AV6 AV2 AV4 AV1 AV1 AV2 AV6 AV1 Attachment Page 15 of 39

Table 4 Seabrook OR1 1; SG-A Non-AVB Imperfections Row Column Percent Nominal Throughwall Location 1

36 27 TSC Sludge lance rail 1

87 26 TSC Sludge lance rail 49 29 22 TSH Foreign Object -

old 50 29 11 TSH Foreign Object -

old Attachment Page 16 of 39

Table 5 Seabrook OR1 1; SG-B Listing of AVB Wear Signals Row Column Percent Throughwall 15 68 14 17 64 21 17 77 16 18 66 15 18 74 21 19 66 17 21 68 16 21 77 17 22 69 17 22 86 14 22 86 12 22 89 18 22 89 19 22 116 10 23 47 12 23 47 12 23 56 15 23 56 16 25 51 16 25 51 18 25 51 14 27 57 17 27 63 18 27 81 19 27 112 12 28 42 17 28 78 22 28 115 12 29 38 13 29 51 17 29 79 28 29 79 23 29 79 25 29 79 13 29 113 17 29 113 17 30 43 15 30 43 20 Nominal Location AV1 AVI AV1 AV1 AV1 AV1 AV1 AV1 AV1 AV2 AV5 AV2 AV6 AV1 AV1 AV2 AV1 AV2 AV1 AV2 AV5 AV2 AV5 AV5 AV1 AV5 AV2 AV5 AV2 AV2 AV1 AV2 AV5 AV6 AV1 AV5 AV2 AV5 Attachment Page 17 of 39

Row Column Percent Throughwall 30 43 17 30 49 12 30 58 14 30 61 20 30 61 31 30 62 16 30 66 17 30 66 17 30 66 23 30 66 13 30 73 19 30 75 32 30 75 27 30 80 12 30 80 20 30 80 16 30 81 28 30 81 32 30 87 22 30 87 27 30 106 20 30 111 18 30 111 19 30 112 23 30 112 19 31 52 13 31 52 16 31 66 14 31 111 14 31 112 22 31 112 26 32 82 23 32 82 16 32 82 14 32 83 16 32 86 15 32 86 13 32 86 16 32 88 16 32 88 18 32 88 14 32 109 18 Nominal Location AV6 AV2 AV5 AV2 AV5 AV2 AV1 AV2 AV5 AV6 AV5 AV2 AV5 AVI AV2 AV5 AV2 AV5 AV2 AV5 AV6 AV2 AV5 AV2 AV5 AV1 AV5 AV6 AV5 AV2 AV2 AV2 AV5 AV6 AV5 AV2 AV3 AV4 AV2 AV3 AV5 AV5 Attachment Page 18 of 39

Row Column Percent Throughwall 32 109 13 33 107 19 33 109 19 33 109 32 34' 14 14 34 14 10 34 70 18 34 70 16 34 70 17 34 72 21 34 94 18 34 98 15 34 103 15 34 103 16 34 105 18 35 44 15 35 44 20 35 55 25 35 58 10 35 58 18 35 58 14 35 58 17 35 59 21 35 59 23 35 59 22 35 59 21 35 67 15 35 68 11 35 68 20 35 68 22 35 68 21 35 68 28 36 59 18 36 64 13 36 64 14 36 65

.31 36 65 18 36 65 15 36 65 25 37 54 13 37 54 20 37 58 12 Nominal Location AV6 AV5 AV4 AV5 AV5 AV6 AV2 AV3 AV4 AV2 AV5 AV3 AV5 AV6 AV6 AV1 AV2 AV4 AV2 AV3 AV4 AV5 AV1 AV2 AV3 AV4 AV2 AV1 AV2 AV3 AV4 AV5 AV2 AV3 AV4 AV2 AV3 AV4 AV5 AV2 AV4 AV3 Attachment Page 19 of 39

Row Column Percent Throughwall 37 69 22-37 87 16 38 52 13 38 66 12 39 48 13 39 48 19 39 48 15 39 48 16 39 49 20 39 49 25 39 49 25 39 49 13 39 54 12 39 54 21 39 54 17 39 54 21 39 54 19 39 56 13 39 56 15 39 57 14 39 57 10 39 60 16 39 60 18 39 60 24 39 60 13 40 48 10 40 48 19 40 48 31 40 48 34 40 48 29 40 48 27 40 48 20 40 74 18 40 105 15.

40 105 14 41 61 13 41 61 25 41 61 13 41 75 20 41 75 25 41 75 12 42 64 12 Nominal Location AV2 AV2 AV2 AV1 AV2 AV3

/AV4 AV5 AV1 AV2

AV3, AV4 AV1 AV2 AV3 AV4 AV5 AV1 AV2 AV2 AV4 AV1 AV2 AV3 AV4 AV1 AV2 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV2 AV4 AV5 AV2 AV3 AV4 AV2 Attachment Page 20 of 39

Row Column 42 81 43 20 43 69 43 69 43 69 43 69 43 43 43 43 43 44 45 45 45 45 45 45 46 46 46 46 46 46 47 47 47 47 47 48 48 49 50 50 50 50 50 50 51 51 53 53 70 75 75 75 75 62 27 33 41 41 41 86 50 50 50 50 50 66 71 71 71 71 94 25

.52 96 36 36 68 93 93 95 70 70 34 44 Percent Throughwall 23 14 22 20 22 25 11 23 19 31 27 11 13 14 21 18 18 22 18 24 27 34 12 11 16 18 26 16 12 18 14 16 17 16 14 13 17 23 16 16 25 19 Nominal Location AV2 AV2 AV2 AV3 AV4 AV5 AV3 AV2 AV3 AV4 AV5 AV4 AV6 AV2 AV2 AV3 AV4 AV1 AV2 AV3 AV4 AV5 AV6 AV3 AV1 AV2 AV3 AV4 AV3 AV5 AV5 AV4 AV5 AV6 AV3 AV2 AV4 AV6 AV5 AV6 AV6 AV6 Attachment Page 21 of 39

Row Column Percent Throughwall 53 90 24 54 36 15 54 43 15 54 66 21 54 86 16 54 86 18 54 87 26 55 43 13 56 68 16 56 71 18 56 82 18 57 55 18 57 68 11 58 48 16 58 68 11 58 76 13 58 76 10 59 68 12 Nominal Location AV5 AV5 AV5 AV3 AV3 AV5 AV5 AV5 AV2 AV2 AV5 AV6 AV5 AV6 AV2 AV3 AV4 AV3 Attachment Page 22 of 39

Table 6 Seabrook OR1 1; SG-B Non-AVB Imperfections Row Column Percent Nominal Throughwall Location 1

87 32 TSH Sludge Lance Rail 1

87 37 TSC Sludge Lance Rail 1

112 19 TSH Sludge Lance Rail 43 96 22 TSH Foreign Object 2

98 32 06C Foreign Object Attachment Page 23 of 39

Table 7 Seabrook ORI 1; SG-C Listing of AVB Wear Signals Row Column Percent Throughwall 10 64 17 15 67 14 22 34 14 24 7

18 24 7

11 24 98 10 25 91 28 26 8

16 28 8

13 28 66 19 30 11 12 30 11 13 30 11 10 30 113 24 30 113 18 30 114 14 30 114 11 31 111 19 32 17 10 33 106 20 33 111 16 33 111 19 34 28 17 34 28 12 35 13 23 35 13 12 35 13 13 35 13 24 35 13 16 35 39 31 35 39 26 35 39 27 35 39 27 35 73 12 37 17 13 37 23 18 37 40 16 37 40 11 Nominal Location AV1 AVI AV2 AV1 AV6 AVI AV2 AV1 AV6 AV2 AV1 AV5 AV6 AV2 AV6 AV2 AV5 AV5 AV1 AV4 AV2 AV5 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV2 AV5 AV5 AV3 AV6 Attachment Page 24 of 39

Row Column Percent Throughwall 37 55 15 37 56 17 37 85 21 37 85 13 37 85 20 37 85 17 37 85 15 38 79 19 38 101 13 38 102 17 39 42 21 39 42 14 39 45 15 39 45 19 39 45 20 39 45 27 39 45 10 39 49 33 39 49 28 39 49 24 39 49 30 39 53 16 39 53 27 39 53 31 39

.53 24 39 53 23 39 69 23 39 69 17 39 69 28 39 69 20 40 46 17 40 46 17 40 46 9

40 46 15 40 46 26 40 46 12 41 22 15 41 22 19 41 22 16 41 23 13 41 23 16 41 30 11 Nominal Location AV2 AV2 AV2 AV3 AV4 AV5 AV6 AV2 AV6 AV5 AV2 AV4 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV1 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV5 AV1 AV5 AV4 v

Attachment Page 25 of 39

Row Column Percent Throughwall 41 30 15 41 30 14 41 39 15 41 39 10 41 39 13 41 41 9

41 41 25 41 41 14 41 41 14 41 43 14 41 43 16 41 43 18 41 80 20 41 80 26 41 80 15 41 80 12 41 93 12 41 93 13 41 93 15 41 93 20 41 100 18 41 100 15 41 100 23 41 100 11 42 23 21 42 23 26 42 25 14 42 25 17 42 25 13 42 31 10 42 31 21 42 31 13 42 46 9

42 66 28 42 66 33 42 66 32 42 66 28 42 66 19 42 71 17 42 71 19 42 92 14 42 92 14' Nominal Location AV5 AV6 AV2 AV5 AV6 AVI AV2 AV3 AV4 AV2 AV3 AV4 AV2 AV3 AV4 AV5 AV1 AV3 AV4 AV5 AV3 AV4 AV5 AV6 AV4 AV5 AV4 AV5 AV6 AV1 AV2 AV3 AV5 AV1 AV2 AV3 AV4 AV6 AV2 AV5 AV2 AV3 Attachment Page 26 of 39

Row Column Percent Nominal Throughwall Location 42 92 10 AV4 42 92 17 AV5 42 102 13 AV1 42 102 30 AV3 42 102 31 AV4 42 102 15 AV5 42 102 22 AV6 43 23 21 AV3 43 23 20 AV4 43 68 12 AV3 43 100 14 AV2 43 100 31 AV4 43 100 18 AV5 43 102 21 AV3 43 102 31 AV4 43 102 31 AV5 43 102 15 AV6 44 75 19 AV1 44 75 18 AV2 44 100 22 AV3 44 100 32 AV4 44 100 31 AV5 46 36 19 AV2 46 36 23 AV3 46 36 27 AV4 46 36 19 AV5 46 79 17 AV2 46 79 19 AV3 46 79 25 AV4 46 79 19 AV6 46 97 10 AV3 46 97 21 AV4 47 30 15 AV5 47 35 13 AV2 47 35 19 AV3 47 35 20 AV4 47 40 13 AV3 47 67 19 AV1 47 67 33 AV2 47 67 30 AV3 47 67 30 AV4 47 67 29 AV5 Attachment Page 27 of 39

Row Column Percent Throughwall 47 67 20 47 76 15 47 76 18 47 83 19 47 86 14 47 86 20 47 93 22 47 93 23 47 93 30 47 94 16 47 94 17 47 94 21 47 94 12 47 94 18 47 96 15 47 98 14 47 98 14 47 99 13 47 99 31 47 99 26 48 30 14 48 30 14 48 33 15 48 35 18 48 96 15 48 96 15 48 96 39 48 96 29 48-96 30 48 97 11 48 97 11 49 95 28 51 51 18 51 51 29 51 51 39 51 84 32

-53 33 13 53 35 13 53 67 29 53 67 32 53

'67 27 53 70 13 Nominal Location AV6 AV1 AV2 AV5 AV4 AV5 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV5 AV3 AV4 AV4 AV5 AV6 AV4 AV5 AV5 AV4 AV2 AV3 AV4 AV5 AV6 AV3 AV4 AV5 AV3 AV4 AV5 AV2 AV3 AV2 AV2 AV3 AV4 AV1 Attachment Page 28 of 39

Row Column Percent Throughwall 53 70 22 53 70 16 54 35 15 54 68 18 54 87 20 54 87 17 54 87 27 55 39 14 56 65 20 57 50 12 Table 8 Seabrook ORI 1; SG-C Non-AVB Imperfections Nominal Location AV2 AV3 AV4 AV2 AV3 AV4 AV5 AV1 AV3 AV2 Row Column Percent Throughwall 1

87 37 1

87 34 1

112 25 3

113 34 43 26 21 44 26 13 Nominal Location TSH TSC TSH 05C TSH TSH Sludge Sludge Sludge Foreign Foreign Foreign Lance Rail Lance Rail Lance Rail Object -old Object -old Object -old Attachment Page 29 of 39

Table 9 Seabrook ORI 1; SG-D Listing of AVB Wear Signals Row Column Percent Throughwall 17 72 14 17 75 15 22 86 13 22 93 12 24 6

15 24 6

18 25 82 12 25 82 16 26 8

13 26 8

19 26 40 12 26 41 12 27 8

10 27 8

21 27 39 21 27 39 20 27 39 19 27 44 21 27 76 11 27 76 11 27 96 12 27 111 11 27 115 19 27 115 15 28 88 16 28 115 13 28 115 13 29 34 23

-,29 34 21 29 83 8

29 83 15

,30 66 12 30 66 17 31 113 13 32 12 10 32 12 10 32 12 32 33 58 11 Nominal Location AV1 AV6 AV2 AV6 AV1 AV6 AV2 AV5 AV1 AV6 AV5 AV2 AV1 AV6 AV2 AV5 AV6 AV2 AV1 AV2 AV6 AV5 AV2 AV5 AV5 AV2 AV5 AV2 AV5 AV1 AV5 AV2 AV5 AV1 AV1 AV3 AV5 AV1 Attachment Page 30 of 39

Row Column Percent Throughwall 33 58 13 33 96 11 33 107 14 34 15 13 34 15 17 34 17 13 34 22 11 34 22 11 34 30 10 34 30 10 34 35 11 34 35 10 34 40 15 34 40 14 34 48 12 34 50 13 34 69 21 34 69 12 34 69 17 34 69 16 34 70 10 34 71 14 34 73 18 34 73 16 34 73 16 34 76 10 34 92 10 34 109 19 35 37 24 35 37 17 35 37 9

35 51 13 35 69 28 35 69 29 35 69 13 35 69 12 35 71 11 35 71 12 35 71 11 35 83 13 35 83 12 35 86 11 Nominal Location AV2 AV2 AV4 AV1 AV4 AV3 AV3 AV6 AV3 AV5 AV2 AV5 AV5 AV6 AV5 AV3 AV2 AV3 AV4 AV5 AV2 AV2 AV2 AV4 AV5 AV2 AV4

AV5, AV2 AV3 AV6 AVl AV2 AV3 AV4 AV6 AV1 AV2 AV3 AV3 AV4 AV4 Attachment Page 31 of 39

Row Column Percent Throughwall 35 86 11 35 88 10 35 88 10 35 88 14 35 89 14 35 89 10 36 16 9

36 40 11 36 40 13 36 40 9

36 40 9

36 40 10 36 41 12 36 46 17 36 67 16 36 80 11 36 82 16 36 82 25 36 82' 14 36 82 19 36 82 21 36 90 15, 37 16 13 37 16 16 37 16 14 37 16 9

37 34 11 37 36 19 37 36 18 37 36 28 37 36 31 37 36 17 37 38 8

37 38 9

37 38 17 37 38 10 37 39 8

37 39 14 37 39 15 37 39 16 37 39 10 37 40 9

Nominal Location AV6 AV2 AV3 AV4 AV2 AV3 AV3 AV2 AV3 AV4 AV5 AV6 AV2 AV5 AV2 AV3 AV1 AV2 AV3 AV4 AV5 AV2 AV1 AV3 AV4 AV6 AV2 AV2 AV3 AV4 AV5 AV6 AV2 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV4 Attachment Page 32 of 39

Row Column Percent Throughwall 37 45 15 37 45 12 37 45 12 37 48 11 37 48 19 37 48 15 37 48 12 37 58 16 37 59 16 37 59 10 37 59 16 37 59 12 37 73 10 37 77 10 37 77 13 37 77 25 37 77 24 37 77 14 37 84 11 37 84 14 38 35 13 38 73 13 38 73 19 38 73 20 38 73 17 39 18 18 39 19 12 39 19 18 39 36 18 39 38 9

39 41 10 39 41 16 39 41 21 39 41 16 39 41 14 39 44 12 39 44 12 39 44 17 39 44 10 39 50 18 39 50 17 39 57 13 Nominal Location AV2 AV3 AV4 AV1 AV3 AV4 AV5 AV2 AV2 AV3 AV4 AV5 AV2 AV1 AV2 AV3 AV4 AV5 AV4 AV6 AV6 AV2 AV3 AV4 AV5 AV5 AV2 AV3 AV5 AV3 AV2 AV3 AV4 AV5 AV6 AV1 AV4 AV5 AV6 AV3 AV5 AV1 Attachment Page 33 of 39

Row Column Percent Nominal Throughwall Location 39 57 22 AV2 39 57 22 AV3 39 57 11 AV4 39 57 11 AV5 39 62 14 AV2 39 74 10 AV2 39 75 12 AV2 39 82 16 AV1 39 82 20 AV2 39 82 19 AV3 39 82 12 AV4 39 82 13 AV5 39 89 16 AV1 39 89 17 AV2 39 94 19 AV2 39 94 13 AV3 39, 94 14 AV4 39 96 14 AV5 39 102 17 AV1 40 21 11 AV6 40 23 12 AVI 40 23 13 AV4 40 26 12 AV3 40 66 30 AV2 40 66 23 AV3 40 66 20 AV3 40 66 14 AV4 40 66 22 AV4 40 66 22 AV5 40 66 16 AV6 41 18 20 AV4 41 20 17 AV2 41 20 18 AV3 41 20 19 AV4 41 20 24 AV5 41 20 14 AV6 41 34 12 AV2 41 34 14 AV3 41 34 13 AV4 41 35 10 AV3 41 36 13 AV1 41 36 10 AV3 Attachment Page 34 of 39

Row Column Percent Throughwall 41 38 18 41 51 11 41 51 15 41 56 12 41 56 30 41 56 19 41 56 28 41 56 32 41 56 22 41 59 17 41 66 29 41 66 20 41 66 10 41 66 14 41 71 11 41 104 9

41 104 9

42 19 9

42 19 14 42 19 11 42 19 12 42 20 13 42 24 28 42 37 23 42 37 22 42 37 12 42 37 11 42 39 12 42 39 14 42 40 12 42 46 23 42 46 15 42 46 18 42 47 14 42 47 13 42 47 11 42 47 19 42 77 11 42 92 12 42 92 12 42 92 11 42 92 14 Nominal Location AV3 AV2 AV3 AV1 AV2 AV3 AV4 AV5 AV6 AV4 AV2 AV3 AV4 AV5 AV2 AV2 AV5 AV1 AV3 AV4 AV5 AV6 AV4 AV2 AV3 AV4 AV6 AV3 AV4 AV6 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV5 AV1 AV3 AV4 AV5 Attachment Page 35 of 39

Row Column Percent Throughwall 42 92 11 42 98 10 42 98 14 42 98 14 43 21 10 43 21 17 43 21 16 43 21 23 43 21 19 43 49 13 43 49 12 43 51 13 43 51 15 43 51 11 43 51 26 44 26 17 44 26 10 44 26 18 44 26 12 44 36 17 44 36 15 44 45 12 44 45 23 44 45 12 44 48 23 44 48 14 44 48 19 44 91 18 44 91 28 44 91 27 44 91 22 44 101 11 45 27 13 45 32 10 45 40 17 45 40 10 45 66 11 45 66 21 45 66 18 46 25 15 46 25 17 46 30 14 Nominal Location AV6 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV6 AV3 AV4 AV2 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AVI AV3 AV3 AV5 AV6 AV3 AV4 AV5 AV2 AV3 AV4 AV5 AV3 AV5 AV2 AV5 AV6 AV1 AV2 AV3 AV5 AV6 AV3 Attachment Page 36 of 39

Row Column Percent Nominal Throughwall Location 46 30 30 AV4 46 30 30 AV5 46 38 13 AV2 46 38 14 AV3 46 38 26 AV4 46 38 15 AV5 46 39 16 AV4 46 39 27 AV5 46 39 16 AV6 46 42 19 AV4 46 42 25 AV5 46 51 16 AV1 46 51 25 AV2 46 51 16 AV3 46 51 34 AV4 46 51 32 AV5 46 60 13 AV4 47 49 26 AV2 47 49 19 AV3 47 53 18 AV4 47 53 25 AV5 47 53 17 AV6 47 59 21 AV1 47 59 36 AV2 47 59 21 AV3 47 59 32 AV4 47 59 22 AV5 47 61 16 AV6 47 75 17 AV1 47 75 17 AV2 47 75 27 AV3 47 75 25 AV4 47 75 32 AV5 47 92 11 AV3 47 97 14 AV3 47 97 11 AV5 48 28 16 AV2 48 28 35 AV3 48 28 35 AV4 48 28 25 AV5 48 65 19 AV4 49 28 17 AV5 Attachment Page 37 of 39

Row Column 49 49 49 49 49 49 49 49 49 49 49 49 49 49 49 49 49 49 49 49 49 50 50 50 50 50 51 51 52 52 52 52 52 52 52 53 53 54 54 55 55 55 36 36 36 42 43 43 43 52 52 52 52 55 55 81 81 87 87 94 94 94 94 35 44 50 94 94 35 62 33 33 33 35 35 35 35 43 62 43 43 39 41 82 Percent Throughwall 13 14 13 15 11 12 12 24 20 19 13 14 12 22 16 15 18 10 8

13 14 10 11 19 18 24 11 11 29 15 16 17 22 28 16 10 13 10 14 10 8

11 1 Nominal Location AV2 AV4 AV5 AV6 AV1 AV2 AV5 AV2 AV3 AV4 AV6 AV1 AV2 AV4 AV5 AV3 AV4 AV2 AV3 AV5 AV6

/AV5 AV2 AV4 AV5 AV6 AV3 AV2 AV4 AV5 AV6 AV2 AV3 AV5 AV6 AV2 AV1 AV2 AV4 AV3 AV2 AV2 Attachment Page 38 of 39

Row Column Percent Nominal Throughwall Location 56 41 23 AV2 56 41 28 AV4 56 41 25 AV5 56 41 12 AV6 56 69 15 AV4 56 69 22 AV5 56 69 16 AV6 56 81 19 AV5 56 81 19 AV6 56 82 10 AV5 58 49 12 AV1 58 49 12 AV4 58 75 10 AV5 58 75 12 AV6 59 66 14 AV1 Table 10 Seabrook ORI 1; SG-D Non-AVB Imperfections Row Column Percent Nominal Throughwall Location 1

32 23 01H FDB Wear 13 4

26 01C FDB Wear 11 102 40 06C Foreign Object Attachment Page 39 of 39