ML22017A005
| ML22017A005 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 01/17/2022 |
| From: | Domingos C Northern States Power Co, Xcel Energy Inc |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| L-Pl-22-002 | |
| Download: ML22017A005 (27) | |
Text
fl Xcel Energy January 17, 2022 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 Prairie Island Nuclear Generating Plant, Unit 2 Docket No. 50-306 Renewed Facility Operating License No. DPR-60 1717 Wakonade Drive Welch, MN 55089 L-Pl-22-002 TS 5.6.7 Prairie Island Nuclear Generating Plant (PINGP) 2021 Unit 2 180-Day Steam Generator Tube Inspection Report Northern States Power Company, a Minnesota corporation, doing business as Xcel Energy (hereafter "NSPM"), hereby submits the report of steam generator tube inspections performed during the 2021 refueling and maintenance outage on Unit 2 per Technical Specification 5.6.7, Steam Generator Tube Inspection Report.
If you have any questions about this submittal, please contact Carrie Seipp, Senior Regulatory Engineer, at 612-330-5576.
Summary of Commitments no new commitments and no revisions to existing commitments.
Christopher P. Domingos Site Vice President, Prairie Island Nuclear Generating Plant Northern States Power Company - Minnesota Enclosure (1) cc:
Administrator, Region Ill, USNRC Project Manager, Prairie Island, USNRC Resident Inspector, Prairie Island, USNRC State of Minnesota
Page 1 of 25 ENCLOSURE 1 PRAIRIE ISLAND NUCLEAR GENERATING PLANT - UNIT 2 2021 STEAM GENERATOR TUBE INSPECTION REPORT In accordance with Prairie Island Nuclear Generating Plant (PINGP), Unit 2 Technical Specification 5.6.7, TSTF-577-A, Rev.1 and Appendix G of Steam Generator Management Program: Steam Generator Integrity Assessment Guidelines: Revision 5. EPRI, Palo Alto, CA: 2021. Deliverable Number: 3002020909, Xcel Energy Nuclear Department submits this report of steam generator tube inspections performed during the 2021 refueling and maintenance outage for Unit 2 (2R32).
PINGP Unit 2 has two Areva Model 56/19 Replacement Steam Generators (RSGs) (see Figure 1 - Steam Generator Schematic) with approximately 5,600 square meters of heat transfer area utilizing tubes with 19 millimeter outside diameter. Each RSG has 4,868 thermally-treated Alloy 690 u-tubes manufactured by Sandvik which have an outside diameter of 0.750 inch and a nominal wall thickness of 0.043 inch. The tubes are configured in a square pitch of 1.0425 inches with 55 rows and 114 columns (see Figure 2).
The tube u-bends vary in radius from 2.7000 inches for a row 1 tube to 58.9950 inches for a row 55 tube. The tubes vary in length from 738.16 inches for row 1 tubes to 923.04 inches for row 55 tubes. Row 1 through row 9 tubes were subject to stress relieving following the bending process using the thermal treatment process for an additional 2-hour minimum soak time. The tubes were hydraulically expanded at each end for the full depth of the tubesheet with the expansion transition being between 0.079 inches and 0.236 inches below the secondary tubesheet face.
The tubesheet is low alloy steel 21.46 inches thick with alloys 82 and 182 cladding 0.375 thick for an overall thickness of 21.835 inches. The tubes are supported by eight tube support plates (TSPs) and five anti-vibration bars (AVBs) intersecting tubes between 1, 3, 5, 7 and 9 times (see Figure 3). There is one straight bar that intersects all rows at the center of each bend, two 57-degree bars that intersect rows 13 through 55 and two 14-degree bars that intersect rows 25 through 55. In addition, there are 24 peripheral tubes with nine staples (one at each AVB location) that carry the entire load of the complete AVB assembly. All TSPs are constructed from Type 410 stainless steel. The TSPs have a minimum thickness of 1.18 inch and have quatrefoil-shaped holes through which the tubes pass. The AVBs are constructed from Type 405 stainless steel and are rectangular in cross section (nominally 0.5 inch by 0.3 inch).
Each RSG is equipped with a Loose Parts Trapping Systems (LPTS), which is composed of screens at the top of the downcomer and at the top of the primary (cyclone) separators.
These screens (0.14 square mesh formed from 0.031 diameter wire), prevent foreign material from entering the steam generator tube area from the main feedwater and auxiliary feedwater systems (see Figure 3).
Page 2 of 25 Figure 1
Page 3 of 25 Figure 2
Page 4 of 25 Figure 3 The original Westinghouse Model 51 Steam Generators (SGs) were replaced during the 2013 refueling outage after 33.56 EFPY of operation. The prior inspection outage was completed during the 2015 refueling outage and it was the first in-service inspection (ISI) conducted on the RSGs after installation and an initial accumulating of 1.66 EFPY of operation. The RSGs accumulated 5.37 EFPY between the first ISI and the current inspection. During the 2021 refueling outage the second in-service inspection (ISI) was conducted on the RSGs after accumulating the 7.03 EFPY of RSG operation. At Prairie Island U2R32, approximately 64.4 effective full power months (EFPM) of the 144 EFPM in the first sequential period have been accrued with no operational leakage reported during this operating interval. The nominal THOT during the past inspection interval was 595F.
There were no Degradation Assessment defined sub-populations of tubes with increased degradation susceptibility. There were no deviations taken from Mandatory and/or Needed (Shall) requirements important to tube integrity from the EPRI Guidelines referenced by NEI 97-06 since the last inspection.
NOTE:
Italicized text represents technical specification excerpts. Each excerpt is followed by the appropriate information intended to address each specific requirement and includes additional details based on benchmarking previous submittals, Staff requests for additional information of peer Licensees, TSTF-577-A Rev.1 reporting requirements and EPRI Tube Integrity Assessment Guidelines reporting requirements. A legend of codes and field names is included at the end of the report.
5.6 Reporting Requirements 5.6.7 Steam Generator Tube Inspection Report A report shall be submitted within 180 days after initial entry into MODE 4 following completion of an inspection performed in accordance with the Specification 5.5.8, Steam Generator (SG) Program.
Initial entry into MODE 4 occurred on October 25, 2021, dictating submittal of this report on or before April 23, 2022.
Page 5 of 25 The report shall include:
- a. The scope of inspections performed on each SG and if applicable, a discussion of the reason for scope expansion, Table 1 and the notes that follow, provides the scope of inspections performed during 2R32. There was no NDE inspection scope expansion required during Prairie Island 2R32.
TABLE 1 SCOPE LEG EXTENT TECHNIQUE SG 21 SG 22 Row 7 through 55 H/C F/L X-Probe' 100% (4182) 100% (4177)
Row 6 H
AV5TEH X-Probe' 100% (114) 100% (114)
Row 6 C
AV5TEC X-Probe' 100% (114) 100% (114)
Row 1 through 5 H
08HTEH X-Probe' 100% (570) 100% (570)
Row 1 through 5 C
08CTEC X-Probe' 100% (570) 100% (570)
Row 1 through 5 H/C BEND Bobbin 100% (570) 100% (570)
Special Interest H
01HTEH X-Probe' 100% (8)
N/A Channel Head H/C N/A Visual 100%
100%
Inservice Plugs H/C N/A Visual 100% (4) 100% (14)
Post Plugging H/C N/A Visual 100% (2) 100% (10)
Upper Internals N/A N/A Visual 100%
100%
Top of Tubesheet H/C N/A Visual 100%
100%
In-bundle H/C N/A Visual
~17%
~17%
PLP FOSAR H/C N/A Visual N/A 100% (2)
Notes:
The X-Probe' deployed contained both a standard bobbin coil and a 16-coil array of transmit/receive coils.
The scope of inspections is provided as a percentage of the open tubes (or plugs) followed by the total number of tests parenthetically (where practical).
The Row 7 through 55 inspections were completed from both legs (either hot or cold) over the full length (F/L) of each tube (TEHTEC or TECTEH).
Rows 1 and 2 had limited array coverage at the upper tube support plates (08H and 08C) because the array probe was not able to run through the Rows 3 through 5 u-bends or completely through the Rows 1 and 2 upper tube support plates and u-bends.
The Row 1 through 5 inspections were completed from both legs (either hot or cold) over the full bend portion of each tube (08HTEC or 08CTEH).
Special Interest X-Probe' examinations on tubes surrounding a foreign object post retrieval.
Westinghouse NSAL-12-1 video camera inspections of the entire channel head cladding, including the divider plate-to-channel head weld and the channel head-to-tubesheet girth weld seam region.
Inservice tube plugs were visually examined for signs of leakage and proper location. Post tube plugging visual inspections were conducted by Engineering to validate the tube plug location and proper insertion/installation.
Inspections of the upper internals included the visual inspections of all bolted closures (manways and camera ports), Feedwater Ring J-tubes, Primary (Moisture) Separators, Loose Parts Trapping screens, Downcomer Loose Parts Trapping System (LPTS) and wrapper position per NRC Generic Letter 97-06 and Prairie Island Unit 2 56/19 Replacement Steam Generator Operation and Maintenance Manual.
Tube lane and periphery of the bundle inspected looking down both rows and columns in-bundle using remote video equipment.
Video inspection of one out of every six columns traversing from the periphery to the open tube lane.
Foreign Object Search and Retrieval of possible loose part (PLP) indications for evaluation and possible removal based on eddy current.
Page 6 of 25
- b. Degradation mechanisms found, Primary Side Inspections - AVB wear and TSP wear were the only degradation mechanisms found in either SG during 2R32.
For AVB wear, the deepest %TW sizing of any AVB wear indication by either bobbin or array probe observed during 2R32 was measured at 12% TW (by array) in both SG 22 tube R54C52 and SG22 tube R29C57. The measured depth is considerably less than the worst case AVB support wear indication projection of 27%TW from the 2R29 Operational Assessment (OA).
For TSP wear, the deepest %TW sizing of any TSP wear indication observed during 2R32 was measured at 31% TW by both the bobbin and array probes.
This indication in SG22 tube R55C57 is less than the worst-case projected TSP wear indication of 43%TW from the 2R29 OA.
Secondary Side Inspections - No secondary side degradation was found.
- b. The nondestructive examination techniques utilized for tubes with increased degradation susceptibility, Prairie Island does not have any specifically identified tubing areas with an increased degradation susceptibility. However, as described in Table 1 above, the X-Probe' was utilized on 100% of the tubing full length (from tube end to tube end) except for portions of rows 1 through 5 u-bends.
- c. The nondestructive examination techniques utilized for each degradation mechanism found, Table 2 and the notes that follow, provide the Electric Power Research Institute (EPRI) Examination Technique Specification Sheet (ETSS) (techniques) utilized during 2R32 for existing and potential degradation.
Page 7 of 25 TABLE 2 CLASSIFICATION MECHANISM LOCATION PROBE TECHNIQUE Existing Wear TSP Bobbin 96004.1 Rev. 13 X-Probe' M11956.1 Rev. 4 Existing Wear AVB Bobbin M96041.1 Rev. 6 X-Probe' M17909.2 Rev. 1 Potential Wear Staple Bobbin M96041.1 Rev. 6 X-Probe' M17909.2 Rev. 1 Potential Wear PLP Bobbin 27091.2 Rev. 2 X-Probe' 1790#.# Rev. #
Potential Wear Tube-to-Tube Bobbin 13091.1 Rev. 0 X-Probe' 13902.1 Rev. 0 Notes:
Existing or Potential degradation as defined in the EPRI SGMP: Steam Generator Integrity Assessment Guidelines, Revision 4.
Each listed technique was site validated for both detection and sizing. In addition, bobbin ETSSs 96010.1 Rev. 7, 24013.1 Rev. 2 and 96007.1 Rev. 12 were site validated for use on non-degradation (MBMs, DNGs, PDSs and cold laps).
M indicates the cited ETSS is an Appendix I qualified technique with system performance quantified using Model Assisted Probability of Detection (MAPOD).
- Users select the best EPRI ETSS (1 through 6,.1 or.3, Current Revision) based on the wear shape, coil detection set and applies the published performance indices.
Page 8 of 25
- d. Location, orientation (if linear), and measured sizes (if available) of service induced indications, and voltage responses of each indication. For tube wear at support structures less than 20 percent through-wall, only the total number of indications needs to be reported, Tables 3 and 4 provide the location, orientation, voltage, and measured size of each reported AVB and TSP wear indication in each steam generator respectively for the degradation found during 2R32 that were sized less than 20% through wall by the both the bobbin and/or array techniques. All the tubes in these two tables were returned to service.
Tables 5 and 6 provide the location, orientation, voltage, and measured size of each reported AVB and TSP wear indication in each steam generator respectively for the degradation found during 2R32 that were sized greater than or equal to 20% through wall by either the bobbin or the array technique and includes all other indications in the same tube sized less than 20% through wall.
All the tubes in these two tables were also returned to service.
Tables 7 and 8 provide the location, orientation, voltage, and measured sizes of AVB and TSP wear indications in each steam generator respectively for tubes preventively plugged during 2R32 and includes all indications in the same tube regardless of percent through wall.
Within Table 3, one tube (R18C55), had two wear scars at separate TSP contact points at the same relative elevation confirmed by the array coil. Within Table 4, three tubes (R32C15, R51C37 and R28C104), each had two wear scars at separate TSP contact points at the same relative elevation confirmed by the array coil. Within Tables 3 through 8, no other tubes were reported with multiple VOL calls at the same ROW/COL/LOC/PROBE which would confirm indications of double sided AVB wear or multiple wear location sites on multiple land contact points of a Quatrefoil TSP. Conversely, all VOL calls at the same ROW/COL/LOC/PROBE confirm only single sided wear sites at all AVB and all other TSP locations.
A legend of fields and codes with brief explanations is provided at the end of this enclosure for clarification purposes.
Page 9 of 25 TABLE 3 Steam Generator 21 Less Than 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 1
1 5
1 0.11 10 WAR 04C
-0.75 Bobbin DQA CBA 1
1 5
1 0.29 13 VOL 04C
-0.72 0.25 Array WAR TPR 2
2 2
2 0.34 14 VOL 04C
-0.69 0.53 Array DlL TPR NBC 3
3 3
2 0.12 10 WAR 04C
-0.74 Bobbin CBA 3
3 3
2 0.37 15 VOL 04C
-0.72 0.56 Array WAR TPR 4
4 5
2 0.1 9
WAR 04C
-0.75 Bobbin DQA CBA 4
4 5
2 0.49 16 VOL 04C
-0.7 0.59 Array WAR TPR 5
5 5
5 0.28 13 VOL 04C
-0.72 0.25 Array WAR TPR NBC 6
6 23 9
0.34 14 VOL 04H 0.4 0.24 Array WAR TPR 6
6 23 9
0.09 8
WAR 04H 0.67 Bobbin CBA 7
7 26 11 0.51 17 VOL 02C 0.37 0.56 Array WAR TPR 7
7 26 11 0.1 9
WAR 02C 0.4 Bobbin CBA 8
8 27 11 0.53 17 VOL 02C 0.42 0.48 Array WAR TPR 8
8 27 11 0.08 7
WAR 02C 0.42 Bobbin CBA 9
9 24 14 0.4 15 VOL 04H
-0.67 0.32 Array TPR NBC 10 10 10 15 0.5 16 VOL 04C 0.33 0.3 Array WAR TPR 10 10 10 15 0.13 11 WAR 04C 0.36 Bobbin CBA 11 11 37 16 0.16 13 WAR 02C 0.4 Bobbin CBA 11 11 37 16 0.67 18 VOL 02C 0.42 0.53 Array WAR TPR 12 12 38 20 0.2 11 VOL 05H 0.48 0.21 Array WAR TPR 12 12 38 20 0.1 9
WAR 05H 0.83 Bobbin CBA 13 13 36 21 0.14 12 WAR 05C 0.37 Bobbin CBA 13 13 36 21 0.41 10 VOL 05C 0.64 0.38 Array WAR TPR 14 14 43 22 0.12 10 WAR 02C 0.43 Bobbin CBA 14 14 43 22 0.5 16 VOL 02C 0.43 0.79 Array WAR TPR 15 15 12 25 0.56 17 VOL 05C 0.33 0.45 Array WAR TPR 15 15 12 25 0.17 14 WAR 05C 0.36 Bobbin CBA 16 16 11 30 0.12 10 WAR 05H 0.42 Bobbin CBA 16 16 11 30 0.38 15 VOL 05H 0.61 0.31 Array WAR TPR 17 17 12 35 0.42 15 VOL 05C 0.42 0.39 Array WAR TPR 17 17 12 35 0.09 8
WAR 05C 0.56 Bobbin CBA 18 18 11 37 0.15 13 WAR 02H 0.56 Bobbin CBA 18 18 11 37 0.22 12 VOL 02H 0.56 0.32 Array WAR TPR 19 19 48 37 0.29 13 VOL 05C
-0.72 0.25 Array TPR NBC 20 20 49 37 0.42 15 VOL 04H
-0.73 0.42 Array WAR TPR NBC 21 21 11 39 0.32 14 VOL 03H 0.46 0.16 Array WAR TPR 21 21 11 39 0.12 10 WAR 03H 0.48 Bobbin CBA 22 22 42 40 0.11 10 WAR 06H 0.27 Bobbin CBA 22 22 42 40 0.38 9
VOL 06H 0.32 0.34 Array WAR TPR 23 23 51 41 0.51 17 VOL 04H
-0.73 0.59 Array WAR TPR 23 23 51 41 0.11 10 WAR 04H
-0.59 Bobbin CBA 24 24 36 42 0.29 13 VOL 04H 0.35 0.35 Array WAR TPR
Page 10 of 25 TABLE 3 Steam Generator 21 Less Than 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 24 24 36 42 0.12 10 WAR 04H 0.48 Bobbin CBA 25 25 46 43 0.09 8
WAR 05H 0.43 Bobbin CBA 25 25 46 43 0.31 14 VOL 05H 0.43 0.27 Array WAR TPR 26 26 48 43 0.37 15 VOL 08C
-0.7 0.36 Array TPR NBC 27 27 51 43 0.58 12 VOL 06H
-0.7 0.34 Array WAR TPR 27 27 51 43 0.13 11 WAR 06H
-0.67 Bobbin CBA 28 28 52 45 0.3 13 VOL 02C 0.53 0.22 Array WAR TPR 28 28 52 45 0.24 18 WAR 02C 0.56 Bobbin CBA 28 29 52 45 0.3 13 VOL 04H
-0.72 0.43 Array WAR TPR NBC 29 30 47 47 0.42 6
VOL AV3
-0.16 0.82 Array WAR TPR 29 30 47 47 0.11 4
AVB AV3
-0.08 Bobbin CBA 30 31 54 47 0.58 17 VOL 05C 0.35 0.93 Array WAR TPR 30 31 54 47 0.11 10 WAR 05C 0.37 Bobbin CBA 31 32 48 48 0.27 13 VOL 06C
-0.7 0.3 Array TPR NBC 32 33 53 49 0.34 14 VOL 04H
-0.66 0.63 Array WAR TPR 32 33 53 49 0.12 10 WAR 04H
-0.6 Bobbin CBA 33 34 54 49 0.44 16 VOL 06H
-0.77 0.61 Array WAR TPR NBC 33 35 54 49 0.56 11 VOL AV9 0.05 0.64 Array WAR TPR 33 35 54 49 0.06 2
AVB AV9 0.61 Bobbin CBA 34 36 53 51 0.25 12 VOL 07H
-0.78 0.32 Array WAR TPR NBC 35 37 54 51 0.34 14 VOL 04H
-0.67 0.51 Array WAR TPR 35 37 54 51 0.08 7
WAR 04H
-0.59 Bobbin CBA 36 38 45 52 0.32 14 VOL 06C
-0.72 0.26 Array WAR TPR 36 38 45 52 0.07 6
WAR 06C
-0.67 Bobbin CBA 37 39 54 52 0.35 14 VOL 03H
-0.69 0.45 Array WAR TPR 37 39 54 52 0.08 7
WAR 03H
-0.64 Bobbin CBA 37 40 54 52 0.36 14 VOL 04H
-0.7 0.54 Array TPR NBC 37 41 54 52 0.18 11 VOL 06C
-0.74 0.47 Array WAR TPR 37 41 54 52 0.09 8
WAR 06C
-0.74 Bobbin CBA 37 42 54 52 0.14 12 WAR 07H
-0.69 Bobbin CBA 37 42 54 52 0.47 16 VOL 07H
-0.69 0.66 Array WAR TPR 38 43 55 52 0.36 14 VOL 02C
-0.64 0.96 Array TPR NBC 38 44 55 52 0.46 16 VOL 04C 0.29 0.61 Array WAR TPR 38 44 55 52 0.11 10 WAR 04C 0.32 Bobbin CBA 39 45 52 53 0.08 8
WAR 04C
-0.81 Bobbin CBA 39 45 52 53 0.37 15 VOL 04C
-0.81 0.28 Array WAR TPR 39 46 52 53 0.24 12 VOL 06C
-0.7 0.31 Array WAR TPR NBC 40 47 53 53 0.09 8
WAR 03H
-0.64 Bobbin CBA 40 47 53 53 0.3 13 VOL 03H
-0.64 0.4 Array WAR TPR 40 48 53 53 0.08 7
WAR 05H
-0.72 Bobbin CBA 40 48 53 53 0.33 14 VOL 05H
-0.66 0.5 Array WAR TPR 41 49 54 53 0.48 16 VOL 04H 0.42 0.59 Array WAR TPR
Page 11 of 25 TABLE 3 Steam Generator 21 Less Than 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 41 49 54 53 0.14 12 WAR 04H 0.45 Bobbin CBA 41 50 54 53 0.35 14 VOL 06H
-0.77 0.37 Array WAR TPR 41 50 54 53 0.09 8
WAR 06H
-0.67 Bobbin CBA 41 51 54 53 0.25 12 VOL 07H
-0.72 0.37 Array WAR TPR 41 51 54 53 0.11 10 WAR 07H
-0.67 Bobbin CBA 42 52 53 54 0.08 7
WAR 04C 0.31 Bobbin CBA 42 52 53 54 0.36 14 VOL 04C 0.39 0.62 Array WAR TPR 42 53 53 54 0.1 9
WAR 06H
-0.79 Bobbin CBA 42 53 53 54 0.36 14 VOL 06H
-0.79 0.28 Array WAR TPR 43 54 54 54 0.52 17 VOL 04H 0.4 0.63 Array WAR TPR 43 54 54 54 0.09 8
WAR 04H 0.4 Bobbin CBA 43 55 54 54 0.34 14 VOL 05H 0.45 0.26 Array WAR TPR 43 55 54 54 0.17 14 WAR 05H 0.51 Bobbin CBA 44 56 55 54 0.14 12 WAR 04C 0.32 Bobbin CBA 44 56 55 54 0.59 18 VOL 04C 0.35 0.59 Array WAR TPR 44 57 55 54 0.11 10 WAR 06C
-0.77 Bobbin CBA 44 57 55 54 0.39 15 VOL 06C
-0.75 0.59 Array WAR TPR 44 58 55 54 0.14 12 WAR 08C
-0.85 Bobbin CBA 44 58 55 54 0.49 16 VOL 08C
-0.77 0.32 Array WAR TPR 45 59 18 55 0.23 12 VOL 03H 0.45 0.29 Array WAR TPR 45 59 18 55 0.21 16 WAR 03H 0.45 Bobbin CBA 45 59 18 55 0.36 14 VOL 03H 0.45 0.37 Array WAR TPR 46 60 46 56 0.09 8
WAR 04H 0.4 Bobbin CBA 46 60 46 56 0.32 14 VOL 04H 0.43 0.4 Array WAR TPR 47 61 47 56 0.09 8
WAR 04H
-0.67 Bobbin CBA 47 61 47 56 0.36 14 VOL 04H
-0.61 0.53 Array WAR TPR 48 62 53 56 0.08 7
WAR 04H
-0.61 Bobbin CBA 48 62 53 56 0.36 14 VOL 04H
-0.59 0.77 Array WAR TPR 49 63 52 57 0.37 15 VOL 06C
-0.7 0.28 Array TPR NBC 50 64 54 57 0.35 14 VOL 04C
-0.72 0.29 Array WAR TPR 50 64 54 57 0.07 6
WAR 04C
-0.72 Bobbin CBA 51 65 52 58 0.61 18 VOL 05H
-0.75 0.36 Array WAR TPR 51 65 52 58 0.11 10 WAR 05H
-0.64 Bobbin CBA 52 66 55 58 0.44 16 VOL 02C
-0.24 1.09 Array TPR NBC 53 67 54 59 0.41 15 VOL 08C
-0.8 0.5 Array WAR TPR 53 67 54 59 0.1 9
WAR 08C
-0.8 Bobbin CBA 54 68 55 59 0.13 11 WAR 01C
-0.56 Bobbin CBA 54 68 55 59 0.67 18 VOL 01C
-0.53 1.22 Array WAR TPR 54 69 55 59 0.1 9
WAR 01H
-0.5 Bobbin CBA 54 69 55 59 0.51 17 VOL 01H
-0.48 0.53 Array WAR TPR 54 70 55 59 0.09 8
WAR 04C
-0.74 Bobbin CBA 54 70 55 59 0.24 12 VOL 04C
-0.66 0.72 Array WAR TPR
Page 12 of 25 TABLE 3 Steam Generator 21 Less Than 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 54 71 55 59 0.32 14 VOL 08C
-0.77 0.37 Array TPR NBC 55 72 53 60 0.08 7
WAR 04C
-1.14 Bobbin CBA 55 72 53 60 0.3 13 VOL 04C
-0.69 0.74 Array WAR TPR 56 73 54 60 0.14 12 WAR 06C
-0.74 Bobbin CBA 56 73 54 60 0.66 18 VOL 06C
-0.72 0.83 Array WAR TPR 57 74 55 60 0.23 18 WAR 02C
-0.69 Bobbin CBA 57 74 55 60 0.36 14 VOL 02C
-0.61 1.22 Array WAR TPR 58 75 43 61 0.09 8
WAR 04H
-0.69 Bobbin CBA 58 75 43 61 0.27 13 VOL 04H
-0.66 0.26 Array WAR TPR 59 76 26 62 0.17 14 WAR 04H 0.35 Bobbin CBA 59 76 26 62 0.47 16 VOL 04H 0.41 0.27 Array WAR TPR 60 77 54 62 0.37 9
VOL 06H
-0.8 0.32 Array WAR TPR NBC 60 78 54 62 0.65 18 VOL 08C 0.3 0.4 Array WAR TPR 60 78 54 62 0.18 15 WAR 08C 0.32 Bobbin CBA 61 79 55 62 0.11 10 WAR 04C
-0.56 Bobbin CBA 61 79 55 62 0.37 9
VOL 04C
-0.56 0.38 Array WAR TPR 61 80 55 62 0.08 7
WAR 07H
-0.85 Bobbin CBA 61 80 55 62 0.29 13 VOL 07H
-0.8 0.38 Array WAR TPR 62 81 42 63 0.11 10 WAR 05C 0.45 Bobbin NCA 63 82 54 64 0.11 10 WAR 02C
-0.56 Bobbin CBA 63 82 54 64 0.67 18 VOL 02C
-0.42 0.8 Array WAR TPR 64 83 54 66 0.41 15 VOL 05C 0.45 0.25 Array WAR TPR 64 83 54 66 0.19 15 WAR 05C 0.5 Bobbin CBA 64 84 54 66 0.09 8
WAR 07H
-0.76 Bobbin CBA 64 84 54 66 0.25 12 VOL 07H
-0.73 0.54 Array WAR TPR 65 85 53 67 0.35 14 VOL 04C
-0.7 0.47 Array WAR TPR 65 85 53 67 0.09 8
WAR 04C
-0.64 Bobbin CBA 66 86 53 68 0.37 15 VOL 04C
-0.67 0.31 Array WAR TPR 66 86 53 68 0.06 5
WAR 04C
-0.64 Bobbin CBA 66 87 53 68 0.11 10 WAR 07H
-0.81 Bobbin CBA 66 87 53 68 0.36 14 VOL 07H
-0.76 0.34 Array WAR TPR 67 88 54 68 0.12 10 WAR 04H 0.39 Bobbin CBA 67 88 54 68 0.42 15 VOL 04H 0.42 0.48 Array WAR TPR 68 89 49 69 0.09 8
WAR 07H
-0.78 Bobbin CBA 68 89 49 69 0.31 14 VOL 07H
-0.73 0.28 Array WAR TPR 69 90 35 70 0.09 8
WAR 04H
-0.78 Bobbin CBA 69 90 35 70 0.24 12 VOL 04H
-0.7 0.35 Array WAR TPR 70 91 51 70 0.12 10 WAR 03H
-0.78 Bobbin CBA 70 91 51 70 0.24 12 VOL 03H
-0.58 0.47 Array WAR TPR 71 92 53 70 0.1 9
WAR 03H
-0.83 Bobbin CBA 71 92 53 70 0.23 12 VOL 03H
-0.67 0.58 Array WAR TPR 72 93 5
71 0.24 12 VOL 02H 0.35 0.27 Array WAR TPR
Page 13 of 25 TABLE 3 Steam Generator 21 Less Than 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 72 93 5
71 0.11 10 WAR 02H 0.43 Bobbin CBA 73 94 45 71 0.41 15 VOL 04C
-0.67 0.5 Array WAR TPR 73 94 45 71 0.13 11 WAR 04C
-0.61 Bobbin CBA 74 95 53 71 0.27 13 VOL 08C
-0.84 0.34 Array WAR TPR 74 95 53 71 0.07 6
WAR 08C
-0.81 Bobbin CBA 75 96 50 72 0.35 14 VOL 05C
-0.95 0.25 Array WAR TPR 75 96 50 72 0.12 10 WAR 05C
-0.64 Bobbin CBA 76 97 48 74 0.22 12 VOL 05C 0.45 0.22 Array WAR TPR 76 97 48 74 0.12 10 WAR 05C 0.5 Bobbin CBA 77 98 52 74 0.09 8
WAR 07H 0.25 Bobbin CBA 77 98 52 74 0.4 15 VOL 07H 0.31 0.72 Array WAR TPR 78 99 47 79 0.32 14 VOL 06C
-0.73 0.3 Array WAR TPR 78 99 47 79 0.09 8
WAR 06C
-0.71 Bobbin CBA 79 100 48 79 0.41 15 VOL 06C
-0.75 0.31 Array TPR NBC 80 101 44 81 0.17 11 VOL 04H
-0.7 0.4 Array TPR NBC 81 102 49 82 0.33 14 VOL 08C
-0.76 0.28 Array TPR NBC 82 103 49 83 0.51 17 VOL 04H 0.36 0.34 Array WAR TPR 82 103 49 83 0.19 15 WAR 04H 0.39 Bobbin CBA 83 104 47 87 0.28 13 VOL 03H
-0.7 0.24 Array WAR TPR NBC 84 105 39 88 0.4 15 VOL 03H 0.32 0.33 Array WAR TPR 84 105 39 88 0.2 16 WAR 03H 0.38 Bobbin CBA 85 106 40 90 0.13 11 WAR 05H 0.32 Bobbin CBA 85 106 40 90 0.49 16 VOL 05H 0.41 0.27 Array WAR TPR 86 107 42 91 0.21 12 VOL 04H
-0.7 0.43 Array TPR NBC 87 108 31 96 0.07 7
WAR 05H
-1.16 Bobbin CBA 87 108 31 96 0.29 13 VOL 05H
-0.78 0.3 Array WAR TPR 88 109 33 100 0.18 15 WAR 02H 0.43 Bobbin CBA 88 109 33 100 0.41 15 VOL 02H 0.46 0.32 Array WAR TPR 89 110 35 101 0.42 15 VOL 04H
-0.7 0.55 Array WAR TPR NBC 90 111 25 105 0.32 9
VOL 05H 0.37 0.37 Array WAR TPR 90 111 25 105 0.12 10 WAR 05H 0.37 Bobbin CBA 91 112 6
113 0.11 10 WAR 02H
-0.74 Bobbin CBA 91 112 6
113 0.17 11 VOL 02H
-0.69 0.9 Array WAR TPR 92 113 5
114 0.1 9
WAR 02C
-0.61 Bobbin CBA 92 113 5
114 0.32 14 VOL 02C
-0.51 0.56 Array WAR TPR
Page 14 of 25 TABLE 4 Steam Generator 22 Less Than 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 1
1 6
2 0.08 7
WAR 04C
-0.76 Bobbin CBA 1
1 6
2 0.28 13 VOL 04C
-0.68 0.32 Array WAR TPR 2
2 1
4 0.29 13 VOL 06C
-0.69 0.42 Array WAR TPR LAC 2
2 1
4 0.07 6
WAR 06C
-0.5 Bobbin LAC CBA 3
3 16 5
0.13 11 WAR 04H 0.42 Bobbin NCA 4
4 22 10 0.08 7
WAR 04H
-0.73 Bobbin CBA 4
4 22 10 0.33 14 VOL 04H
-0.73 0.31 Array WAR TPR 5
5 25 11 0.14 12 WAR 04C
-0.75 Bobbin CBA 5
5 25 11 0.28 13 VOL 04C
-0.73 0.28 Array WAR TPR 6
6 27 11 0.14 12 WAR 04H 0.42 Bobbin CBA 6
6 27 11 0.36 14 VOL 04H 0.42 0.36 Array WAR TPR 7
7 6
13 0.26 13 VOL 05C
-0.71 0.8 Array WAR TPR NBC 8
8 27 13 0.16 13 WAR 05C
-0.75 Bobbin NCA 8
8 27 13 0.39 9
VOL 05C
-0.72 0.33 Array WAR TPR 9
9 32 15 0.3 13 VOL 04C
-0.76 0.31 Array WAR TPR 9
9 32 15 0.38 15 VOL 04C
-0.76 0.31 Array WAR TPR 9
9 32 15 0.17 14 WAR 04C
-0.76 Bobbin CBA 10 10 30 16 0.1 9
WAR 04H
-0.67 Bobbin NCA 11 11 37 16 0.52 17 VOL 04H
-0.73 0.37 Array WAR TPR 11 11 37 16 0.16 13 WAR 04H
-0.64 Bobbin CBA 11 12 37 16 0.35 14 VOL 05C
-0.75 0.31 Array TPR NBC 12 13 37 17 0.32 14 VOL 04H
-0.76 0.56 Array WAR TPR 12 13 37 17 0.09 8
WAR 04H
-0.7 Bobbin CBA 13 14 33 18 0.1 9
WAR 05C
-0.78 Bobbin CBA 13 14 33 18 0.48 16 VOL 05C
-0.72 0.45 Array WAR TPR 14 15 43 26 0.1 9
WAR 04C 0.39 Bobbin CBA 14 15 43 26 0.25 12 VOL 04C 0.42 0.22 Array WAR TPR 15 16 39 27 0.49 16 VOL 05C
-0.75 0.3 Array WAR TPR 15 16 39 27 0.14 12 WAR 05C
-0.75 Bobbin CBA 16 17 45 29 0.12 10 WAR 05C
-0.7 Bobbin CBA 16 17 45 29 0.56 17 VOL 05C
-0.67 0.44 Array WAR TPR 17 18 47 30 0.28 13 VOL 05C
-0.72 0.34 Array TPR NBC 18 19 27 31 0.09 8
WAR 05C 0.03 Bobbin CBA 18 19 27 31 0.51 17 VOL 05C 0.31 0.42 Array WAR TPR 19 20 48 31 0.31 14 VOL 04H 0.39 0.73 Array WAR TPR 19 20 48 31 0.23 18 WAR 04H 0.45 Bobbin CBA 20 21 48 32 0.54 17 VOL 05H
-0.72 0.47 Array WAR TPR 20 21 48 32 0.15 13 WAR 05H
-0.67 Bobbin CBA 21 22 49 32 0.45 16 VOL 04H 0.39 0.36 Array WAR TPR 21 22 49 32 0.21 16 WAR 04H 0.45 Bobbin CBA 22 23 1
33 0.31 14 VOL 03C 0.44 0.33 Array WAR TPR LAC 22 23 1
33 0.12 10 WAR 03C 0.47 Bobbin LAC NCA
Page 15 of 25 TABLE 4 Steam Generator 22 Less Than 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 23 24 48 33 0.32 14 VOL 05C
-0.76 0.26 Array TPR NBC 24 25 50 33 0.31 14 VOL 05H
-0.67 0.68 Array WAR TPR 24 25 50 33 0.09 8
WAR 05H
-0.39 Bobbin CBA 25 26 14 34 0.26 13 VOL 03H 0.45 0.16 Array WAR TPR 25 26 14 34 0.1 9
WAR 03H 0.73 Bobbin CBA 26 27 48 34 0.14 12 WAR 04H 0.47 Bobbin NCA 27 28 51 35 0.56 17 VOL 04H
-0.65 0.43 Array WAR TPR 27 28 51 35 0.12 10 WAR 04H
-0.62 Bobbin CBA 28 29 44 36 0.15 13 WAR 05C
-0.78 Bobbin CBA 28 29 44 36 0.34 14 VOL 05C
-0.72 0.53 Array WAR TPR 29 30 51 36 0.52 17 VOL 05H
-0.72 0.31 Array WAR TPR 29 30 51 36 0.13 11 WAR 05H
-0.7 Bobbin CBA 30 31 24 37 0.08 7
WAR 05H
-0.7 Bobbin CBA 30 31 24 37 0.44 16 VOL 05H
-0.67 0.48 Array WAR TPR 31 32 51 37 0.38 15 VOL 04H
-0.73 0.33 Array WAR TPR 31 32 51 37 0.08 7
WAR 04H
-0.45 Bobbin CBA 31 33 51 37 0.3 13 VOL 07H
-0.76 0.34 Array WAR TPR 31 33 51 37 0.35 14 VOL 07H
-0.73 0.62 Array WAR TPR 31 33 51 37 0.09 8
WAR 07H
-0.7 Bobbin CBA 32 34 52 38 0.11 10 WAR 05C
-0.81 Bobbin CBA 32 34 52 38 0.27 13 VOL 05C
-0.72 0.34 Array WAR TPR 33 35 45 39 0.32 14 VOL 04H
-0.73 0.4 Array WAR TPR 33 35 45 39 0.11 10 WAR 04H
-0.68 Bobbin CBA 34 36 48 39 0.35 14 VOL 04H
-0.73 0.56 Array WAR TPR 34 36 48 39 0.08 7
WAR 04H
-0.42 Bobbin CBA 35 37 49 39 0.4 15 VOL 05H
-0.76 0.59 Array WAR TPR 35 37 49 39 0.1 9
WAR 05H
-0.7 Bobbin CBA 36 38 50 39 0.13 11 WAR 04H 0.45 Bobbin NCA 37 39 52 39 0.1 9
WAR 04C 0.42 Bobbin CBA 37 39 52 39 0.3 13 VOL 04C 0.45 0.2 Array WAR TPR 37 40 52 39 0.43 15 VOL 04H
-0.7 0.54 Array WAR TPR NBC 38 41 44 40 0.23 12 VOL 05H 0.36 0.28 Array WAR TPR 38 41 44 40 0.12 10 WAR 05H 0.45 Bobbin CBA 39 42 42 41 0.4 15 VOL 07H
-0.76 0.36 Array WAR TPR 39 42 42 41 0.08 7
WAR 07H
-0.7 Bobbin CBA 40 43 52 41 0.56 17 VOL 05H
-0.73 0.76 Array WAR TPR 40 43 52 41 0.1 9
WAR 05H
-0.65 Bobbin CBA 40 44 52 41 0.63 18 VOL 07H
-0.7 0.65 Array WAR TPR 40 44 52 41 0.16 13 WAR 07H
-0.42 Bobbin CBA 41 45 46 42 0.1 9
WAR 05C
-0.75 Bobbin CBA 41 45 46 42 0.44 16 VOL 05C
-0.72 0.34 Array WAR TPR 42 46 52 42 0.59 18 VOL 04H
-0.69 0.53 Array WAR TPR
Page 16 of 25 TABLE 4 Steam Generator 22 Less Than 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 42 46 52 42 0.14 12 WAR 04H
-0.69 Bobbin CBA 43 47 51 43 0.37 15 VOL 08H
-0.78 0.51 Array WAR TPR 43 47 51 43 0.11 10 WAR 08H
-0.73 Bobbin CBA 44 48 52 43 0.07 6
WAR 05C
-0.75 Bobbin CBA 44 48 52 43 0.41 15 VOL 05C
-0.7 0.39 Array WAR TPR 45 49 12 44 0.12 10 WAR 06C
-0.81 Bobbin NCA 46 50 53 44 0.41 15 VOL 04H
-0.69 0.58 Array WAR TPR 46 50 53 44 0.1 9
WAR 04H
-0.5 Bobbin CBA 47 51 51 46 0.45 16 VOL 07H
-0.75 0.53 Array WAR TPR 47 51 51 46 0.16 13 WAR 07H
-0.7 Bobbin CBA 48 52 37 47 0.3 13 VOL 05H 0.73 0.22 Array WAR TPR NBC 49 53 54 47 0.11 10 WAR 04H
-0.7 Bobbin CBA 49 53 54 47 0.57 17 VOL 04H
-0.7 0.56 Array WAR TPR 50 54 49 48 0.08 7
WAR 07C
-0.81 Bobbin CBA 50 54 49 48 0.31 14 VOL 07C
-0.76 0.28 Array WAR TPR 51 55 52 48 0.13 11 WAR 07H
-0.73 Bobbin CBA 51 55 52 48 0.43 15 VOL 07H
-0.73 0.34 Array WAR TPR 52 56 53 48 0.45 16 VOL 07H
-0.7 0.34 Array WAR TPR 52 56 53 48 0.12 10 WAR 07H
-0.67 Bobbin CBA 53 57 51 49 0.71 19 VOL 07H
-0.73 0.53 Array WAR TPR 53 57 51 49 0.15 13 WAR 07H
-0.67 Bobbin CBA 54 58 54 49 0.35 14 VOL 04H
-0.73 0.25 Array WAR TPR 54 58 54 49 0.06 6
WAR 04H
-0.67 Bobbin CBA 55 59 43 51 0.22 17 WAR 04H 0.47 Bobbin CBA 55 59 43 51 0.22 12 VOL 04H 0.53 0.19 Array WAR TPR 56 60 54 51 0.47 16 VOL 07H
-0.73 0.59 Array WAR TPR 56 60 54 51 0.1 9
WAR 07H
-0.67 Bobbin CBA 57 61 54 52 0.1 9
WAR 07H
-0.63 Bobbin CBA 57 61 54 52 0.47 16 VOL 07H
-0.63 0.58 Array WAR TPR 57 62 54 52 0.6 12 VOL AV6 0
0.43 Array WAR TPR 57 62 54 52 0.09 3
AVB AV6 0
Bobbin CBA 58 63 54 53 0.33 14 VOL 07H 0.35 0.46 Array WAR TPR 58 63 54 53 0.06 6
WAR 07H 0.4 Bobbin CBA 59 64 55 53 0.27 13 VOL 05C
-0.75 0.37 Array TPR NBC 60 65 55 54 0.35 14 VOL 07H
-0.76 0.96 Array WAR TPR 60 65 55 54 0.11 10 WAR 07H
-0.73 Bobbin CBA 60 66 55 54 0.61 18 VOL 08H
-0.75 0.36 Array WAR TPR 60 66 55 54 0.14 12 WAR 08H
-0.73 Bobbin CBA 61 67 54 56 0.76 19 VOL 07H
-0.73 0.61 Array WAR TPR 61 67 54 56 0.23 18 WAR 07H
-0.64 Bobbin CBA 61 68 54 56 0.46 16 VOL 08H
-0.78 0.84 Array WAR TPR 61 68 54 56 0.14 12 WAR 08H
-0.7 Bobbin CBA
Page 17 of 25 TABLE 4 Steam Generator 22 Less Than 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 62 69 29 57 0.16 6
AVB AV3
-0.14 Bobbin CBA 62 69 29 57 0.4 12 VOL AV3
-0.11 0.48 Array WAR TPR 63 70 54 57 0.09 8
WAR 02C 0.45 Bobbin CBA 63 70 54 57 0.44 16 VOL 02C 0.45 0.72 Array WAR TPR 63 71 54 57 0.5 16 VOL 05H
-0.73 0.76 Array WAR TPR 63 71 54 57 0.09 8
WAR 05H
-0.73 Bobbin CBA 64 72 55 58 0.18 15 WAR 02C 0.5 Bobbin CBA 64 72 55 58 0.35 14 VOL 02C 0.56 0.37 Array WAR TPR 65 73 31 60 0.34 9
VOL AV5
-0.06 0.45 Array WAR TPR 65 73 31 60 0.11 4
AVB AV5 0.03 Bobbin TPR CBA 66 74 55 60 0.25 19 WAR 02C 0.53 Bobbin CBA 66 74 55 60 0.59 18 VOL 02C 0.53 0.48 Array WAR TPR 67 75 49 64 0.29 13 VOL 07H
-0.79 0.33 Array WAR TPR 67 75 49 64 0.11 10 WAR 07H
-0.76 Bobbin CBA 68 76 54 64 0.13 11 WAR 05H
-0.7 Bobbin CBA 68 76 54 64 0.78 14 VOL 05H
-0.48 0.81 Array WAR TPR 69 77 55 64 0.63 18 VOL 02C 0.5 0.41 Array WAR TPR 69 77 55 64 0.22 17 WAR 02C 0.53 Bobbin CBA 70 78 44 65 0.43 15 VOL 05H 0.31 0.33 Array WAR TPR 70 78 44 65 0.2 16 WAR 05H 0.36 Bobbin CBA 71 79 42 67 0.15 13 WAR 05H 0.34 Bobbin NCA 72 80 53 67 0.27 13 VOL 05H
-0.73 0.67 Array WAR TPR 72 80 53 67 0.13 11 WAR 05H
-0.73 Bobbin CBA 73 81 53 68 0.39 10 VOL 04H
-0.73 0.27 Array TPR NBC 73 82 53 68 0.3 8
VOL 08C
-0.73 0.28 Array TPR NBC 74 83 52 69 0.38 15 VOL 04H
-0.75 0.47 Array WAR TPR 74 83 52 69 0.14 12 WAR 04H
-0.7 Bobbin CBA 75 84 53 70 0.43 15 VOL 04C
-0.7 0.69 Array WAR TPR NBC 76 85 39 75 0.35 14 VOL 06C
-0.81 0.31 Array WAR TPR 76 85 39 75 0.1 9
WAR 06C
-0.75 Bobbin CBA 77 86 38 76 0.45 16 VOL 03C 0.48 0.28 Array WAR TPR 77 86 38 76 0.26 19 WAR 03C 0.54 Bobbin CBA 78 87 48 77 0.44 16 VOL 04H
-0.71 0.42 Array WAR TPR 78 87 48 77 0.1 9
WAR 04H
-0.65 Bobbin CBA 79 88 50 78 0.09 8
WAR 07H
-0.9 Bobbin CBA 79 88 50 78 0.38 15 VOL 07H
-0.73 0.4 Array WAR TPR 80 89 47 79 0.34 14 VOL 05C
-0.72 0.45 Array WAR TPR 80 89 47 79 0.1 9
WAR 05C
-0.67 Bobbin CBA 81 90 51 79 0.09 8
WAR 07C
-0.83 Bobbin CBA 81 90 51 79 0.32 14 VOL 07C
-0.71 0.33 Array WAR TPR 82 91 47 82 0.3 13 VOL 05C
-0.73 0.28 Array WAR TPR NBC 83 92 39 85 0.35 14 VOL 05H
-0.75 0.28 Array TPR NBC
Page 18 of 25 TABLE 4 Steam Generator 22 Less Than 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 84 93 42 85 0.33 14 VOL 04H
-0.72 0.33 Array TPR NBC 85 94 43 85 0.18 15 WAR 04H 0.33 Bobbin CBA 85 94 43 85 0.36 14 VOL 04H 0.39 0.31 Array WAR TPR 86 95 46 85 0.31 14 VOL 05C
-0.75 0.28 Array TPR NBC 87 96 47 86 0.58 17 VOL 02C 0.48 0.4 Array WAR TPR 87 96 47 86 0.16 13 WAR 02C 0.48 Bobbin CBA 88 97 24 87 0.21 7
VOL 01C
-0.68 0.4 Array WAR TPR NBC 89 98 44 88 0.1 9
WAR 05H
-0.76 Bobbin CBA 89 98 44 88 0.34 14 VOL 05H
-0.76 0.23 Array WAR TPR 90 99 46 88 0.35 14 VOL 04H
-0.75 0.45 Array WAR TPR 90 99 46 88 0.13 11 WAR 04H
-0.73 Bobbin CBA 91 100 1
89 0.11 10 WAR 03C 0.44 Bobbin LAC CBA 91 100 1
89 0.28 13 VOL 03C 0.58 0.31 Array WAR TPR LAC 92 101 6
89 0.29 13 VOL 03C
-0.71 0.37 Array DQA TPR 92 101 6
89 0.09 8
WAR 03C
-0.68 Bobbin DQA CBA 93 102 40 89 0.32 14 VOL 05H
-0.73 0.28 Array TPR NBC 94 103 45 89 0.31 14 VOL 04H
-0.73 0.33 Array WAR TPR NBC 95 104 39 90 0.07 6
WAR 04H
-0.76 Bobbin CBA 95 104 39 90 0.29 13 VOL 04H
-0.7 0.31 Array WAR TPR 96 105 45 90 0.12 10 WAR 05H
-0.78 Bobbin CBA 96 105 45 90 0.41 15 VOL 05H
-0.72 0.34 Array WAR TPR 97 106 41 91 0.1 9
WAR 04H
-0.78 Bobbin CBA 97 106 41 91 0.48 16 VOL 04H
-0.73 0.28 Array WAR TPR 97 107 41 91 0.34 14 VOL 05C
-0.7 0.25 Array WAR TPR 97 107 41 91 0.12 10 WAR 05C
-0.67 Bobbin CBA 97 108 41 91 0.37 15 VOL 05H
-0.73 0.27 Array TPR NBC 97 109 41 91 0.35 14 VOL 06H
-0.73 0.78 Array TPR NBC 98 110 42 91 0.36 14 VOL 05C
-0.73 0.25 Array WAR TPR 98 110 42 91 0.09 8
WAR 05C
-0.42 Bobbin CBA 99 111 44 91 0.31 14 VOL 05H
-0.78 0.33 Array WAR TPR NBC 100 112 38 93 0.12 10 WAR 04H 0.31 Bobbin CBA 100 112 38 93 0.47 16 VOL 04H 0.36 0.45 Array WAR TPR 101 113 41 93 0.1 9
WAR 05H
-0.78 Bobbin CBA 101 113 41 93 0.61 18 VOL 05H
-0.73 0.33 Array WAR TPR 102 114 43 93 0.26 13 VOL 04H
-0.73 0.82 Array TPR NBC 102 115 43 93 0.36 14 VOL 05H 0.31 0.45 Array TPR NBC 103 116 39 94 0.09 8
WAR 05H
-0.79 Bobbin CBA 103 116 39 94 0.34 14 VOL 05H
-0.76 0.34 Array WAR TPR 104 117 41 94 0.15 13 WAR 04H
-0.78 Bobbin CBA 104 117 41 94 0.47 16 VOL 04H
-0.73 0.34 Array WAR TPR 105 118 28 96 0.37 15 VOL 04H
-0.7 0.28 Array TPR NBC 106 119 28 97 0.36 14 VOL 04H
-0.75 0.54 Array TPR NBC
Page 19 of 25 TABLE 4 Steam Generator 22 Less Than 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 107 120 38 97 0.12 10 WAR 04H
-0.76 Bobbin CBA 107 120 38 97 0.22 12 VOL 04H
-0.67 0.64 Array WAR TPR 108 121 39 97 0.33 14 VOL 05H
-0.75 0.37 Array TPR NBC 109 122 26 98 0.39 15 VOL 05C
-0.73 0.4 Array WAR TPR 109 122 26 98 0.1 9
WAR 05C
-0.67 Bobbin CBA 110 123 32 98 0.34 14 VOL 04H 0.34 0.28 Array WAR TPR 110 123 32 98 0.13 11 WAR 04H 0.34 Bobbin CBA 111 124 28 99 0.34 14 VOL 05H
-0.76 0.42 Array TPR NBC 112 125 32 99 0.26 13 VOL 05H
-0.73 0.37 Array TPR NBC 113 126 37 99 0.06 6
WAR 05H
-0.83 Bobbin CBA 113 126 37 99 0.43 15 VOL 05H
-0.75 0.36 Array WAR TPR 114 127 8
100 0.26 13 VOL 03H
-0.89 0.34 Array WAR TPR 114 127 8
100 0.2 16 WAR 03H
-0.83 Bobbin CBA 115 128 36 100 0.08 7
WAR 05H
-0.83 Bobbin CBA 115 128 36 100 0.41 15 VOL 05H
-0.75 0.39 Array WAR TPR 116 129 21 101 0.13 11 WAR 05C 0.45 Bobbin NCA 117 130 30 101 0.38 15 VOL 05H 0.34 0.48 Array TPR NBC 118 131 30 102 0.08 7
WAR 04H
-0.79 Bobbin CBA 118 131 30 102 0.44 16 VOL 04H
-0.7 0.28 Array WAR TPR 119 132 32 102 0.07 6
WAR 05H
-0.79 Bobbin CBA 119 132 32 102 0.27 13 VOL 05H
-0.73 0.45 Array WAR TPR 120 133 33 102 0.37 15 VOL 04H
-0.73 0.28 Array TPR NBC 121 134 31 103 0.33 14 VOL 05C
-0.76 0.28 Array WAR TPR 121 134 31 103 0.09 8
WAR 05C
-0.7 Bobbin CBA 122 135 28 104 0.44 16 VOL 05C
-0.73 0.42 Array WAR TPR 122 135 28 104 0.33 14 VOL 05C
-0.73 0.28 Array WAR TPR 122 135 28 104 0.19 15 WAR 05C
-0.67 Bobbin CBA 123 136 30 104 0.55 17 VOL 05C
-0.73 0.45 Array WAR TPR 123 136 30 104 0.15 13 WAR 05C
-0.67 Bobbin CBA 124 137 28 105 0.46 16 VOL 04C
-0.75 0.3 Array TPR NBC 125 138 26 106 0.41 15 VOL 05C
-0.73 0.34 Array WAR TPR 125 138 26 106 0.11 10 WAR 05C
-0.64 Bobbin CBA 126 139 27 106 0.36 14 VOL 05C
-0.73 0.33 Array TPR NBC 127 140 22 107 0.09 8
WAR 05H
-0.97 Bobbin CBA 127 140 22 107 0.34 14 VOL 05H
-0.78 0.33 Array WAR TPR 128 141 26 107 0.36 14 VOL 05C
-0.73 0.28 Array TPR NBC 129 142 13 108 0.32 9
VOL 04C
-0.72 0.22 Array WAR TPR NBC 129 143 13 108 0.32 14 VOL 05C
-0.67 0.31 Array WAR TPR 129 143 13 108 0.08 7
WAR 05C
-0.64 Bobbin CBA 130 144 14 109 0.42 15 VOL 04C
-0.67 0.33 Array WAR TPR NBC 131 145 21 109 0.2 16 WAR 05H 0.31 Bobbin CBA 131 145 21 109 0.65 18 VOL 05H 0.31 0.34 Array WAR TPR
Page 20 of 25 TABLE 4 Steam Generator 22 Less Than 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 132 146 17 110 0.32 14 VOL 05H
-0.76 0.31 Array WAR TPR NBC 133 147 13 111 0.07 7
WAR 05H
-0.75 Bobbin CBA 133 147 13 111 0.41 15 VOL 05H
-0.75 0.37 Array WAR TPR 134 148 16 111 0.13 11 WAR 05H
-0.95 Bobbin CBA 134 148 16 111 0.62 18 VOL 05H
-0.7 0.36 Array WAR TPR 135 149 6
112 0.33 14 VOL 04C
-0.71 0.29 Array WAR TPR NBC 136 150 7
112 0.54 17 VOL 05H 0.28 0.56 Array WAR TPR 136 150 7
112 0.16 13 WAR 05H 0.28 Bobbin CBA 137 151 6
113 0.69 19 VOL 04H
-0.71 0.61 Array WAR TPR 137 151 6
113 0.24 18 WAR 04H
-0.66 Bobbin CBA TABLE 5 Steam Generator 21 Greater Than or Equal To 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 1
1 43 23 0.13 11 WAR 02C 0.4 Bobbin CBA 1
1 43 23 0.91 21 VOL 02C 0.43 0.75 Array WAR TPR 2
2 54 56 0.59 18 VOL 03H 0.43 0.8 Array WAR TPR 2
2 54 56 0.11 10 WAR 03H 0.43 Bobbin CBA 2
3 54 56 0.92 21 VOL 04C 0.35 0.74 Array WAR TPR 2
3 54 56 0.15 13 WAR 04C 0.37 Bobbin CBA 2
4 54 56 0.13 11 WAR 04H
-0.64 Bobbin CBA 2
4 54 56 0.5 16 VOL 04H
-0.56 0.67 Array WAR TPR 2
5 54 56 0.49 16 VOL 07H
-0.67 0.77 Array WAR TPR 2
5 54 56 0.12 10 WAR 07H
-0.24 Bobbin CBA 3
6 55 57 0.13 11 WAR 06C 0.29 Bobbin CBA 3
6 55 57 0.88 21 VOL 06C 0.32 0.99 Array WAR TPR 4
7 55 61 0.18 15 WAR 02C
-0.58 Bobbin CBA 4
7 55 61 0.58 17 VOL 02C
-0.37 0.93 Array WAR TPR 4
8 55 61 1.08 22 VOL 04C
-0.05 1.38 Array WAR TPR 4
8 55 61 0.18 15 WAR 04C 0.42 Bobbin CBA 4
9 55 61 0.1 9
WAR 05C 0.44 Bobbin CBA 4
9 55 61 0.5 16 VOL 05C 0.44 0.81 Array WAR TPR 4
10 55 61 0.5 16 VOL 06C 0.35 0.83 Array WAR TPR 4
10 55 61 0.08 7
WAR 06C 0.4 Bobbin CBA
Page 21 of 25 TABLE 6 Steam Generator 22 Greater Than or Equal To 20% Through Wall TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 1
1 54 55 0.83 20 VOL 06H
-0.73 0.81 Array WAR TPR 1
1 54 55 0.19 15 WAR 06H
-0.67 Bobbin CBA 2
2 55 55 0.21 16 WAR 04C
-0.72 Bobbin CBA 2
2 55 55 0.38 15 VOL 04C
-0.7 0.61 Array WAR TPR 2
3 55 55 1.08 22 VOL 07H
-0.7 0.51 Array WAR TPR 2
3 55 55 0.3 21 WAR 07H
-0.67 Bobbin CBA 3
4 20 110 0.49 16 VOL 05H 0.31 0.33 Array WAR TPR NBC 3
5 20 110 0.29 21 WAR 06H 0.28 Bobbin CBA 3
5 20 110 0.63 18 VOL 06H 0.33 0.41 Array WAR TPR 4
6 4
113 0.84 20 VOL 04C 0.37 0.76 Array WAR TPR 4
6 4
113 0.12 10 WAR 04C 0.37 Bobbin CBA TABLE 7 Steam Generator 21 Preventive Plugging TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 1
1 42 58 0.53 17 VOL 05H 0.36 0.3 Array WAR TPR 1
1 42 58 0.39 26 WAR 05H 0.42 Bobbin CBA
Page 22 of 25 TABLE 8 Steam Generator 22 Preventive Plugging TUBE #
IND #
ROW COL VOLTS PCT IND LOC ELEV LENGTH PROBE UTIL1 UTIL2 UTIL3 1
1 54 54 1.44 25 VOL 07H
-0.73 0.93 Array WAR TPR 1
1 54 54 0.33 23 WAR 07H
-0.7 Bobbin CBA 1
2 54 54 0.5 16 VOL 08H
-0.76 0.62 Array WAR TPR 1
2 54 54 0.14 12 WAR 08H
-0.75 Bobbin CBA 2
3 55 56 0.1 9
WAR 01H
-0.53 Bobbin CBA 2
3 55 56 0.53 17 VOL 01H
-0.5 0.33 Array WAR TPR 2
4 55 56 0.12 10 WAR 02C 0.42 Bobbin CBA 2
4 55 56 0.53 17 VOL 02C 0.47 0.42 Array WAR TPR 2
5 55 56 0.1 9
WAR 03C
-0.92 Bobbin CBA 2
5 55 56 0.3 13 VOL 03C
-0.7 0.53 Array WAR TPR 2
6 55 56 1.34 24 VOL 07H
-0.73 0.82 Array WAR TPR 2
6 55 56 0.29 21 WAR 07H
-0.67 Bobbin CBA 3
7 55 57 0.36 24 WAR 01H
-0.53 Bobbin CBA 3
7 55 57 1.29 24 VOL 01H
-0.53 0.97 Array WAR TPR 3
8 55 57 0.09 8
WAR 02C 0.42 Bobbin CBA 3
8 55 57 0.6 18 VOL 02C 0.47 0.48 Array WAR TPR 3
9 55 57 2.35 31 VOL 07H
-0.7 0.98 Array WAR TPR 3
9 55 57 0.55 31 WAR 07H
-0.67 Bobbin CBA 4
10 55 61 0.36 24 WAR 02C 0.5 Bobbin CBA 4
10 55 61 1.04 22 VOL 02C 0.53 0.58 Array WAR TPR 5
11 54 62 1.49 25 VOL 02C 0.45 0.75 Array WAR TPR 5
11 54 62 0.3 21 WAR 02C 0.53 Bobbin CBA
Page 23 of 25
- e. Number of tubes plugged during the inspection outage for each degradation mechanism, Table 9 provides the number of tubes plugged during 2R32.
TABLE 9 MECHANISM SG 21 SG 22 AVB Wear 0
0 TSP Wear 1
5
- f. The number and percentage of tubes plugged to date, and the effective plugging percentage in each steam generator, and Table 10 provides the total number and percentage of tubes plugged to date. No tubes were plugged during the RSG manufacturing or prior to service.
TABLE 10 PLUGGING SG 21 SG 22 TOTAL 3
12 PERCENT 0.06%
0.25%
- g. The results of condition monitoring, including the results of tube pulls and in-situ testing.
The deepest AVB wear indication reported during 2R32 was 12%TW as reported from the X-Probe'. The condition monitoring (CM) limit (probabilistically determined, using Monte Carlo simulations to apply tube material, relation, and ETSS depth uncertainties at 0.95 probability and 50% confidence level (95/50))
for flat (uniformly deep) AVB wear is 45.7%TW for the array probe. As the deepest indication is of lesser depth than the CM limit, CM is satisfied.
The deepest TSP wear indication reported during 2R32 was 31%TW tapered wear as reported from both the bobbin and the X-Probe'. The tapered wear TSP CM limit (probabilistically determined, using Monte Carlo simulations to apply tube material, relation, and ETSS depth uncertainties at 0.95 probability and 50% confidence level (95/50)) is 60.1%TW for the bobbin and 64.2% for the array probe. As the deepest indication is of lesser depth than the CM limits, CM is satisfied.
Additionally, an OA was performed that predicts a projected depth of:
- 33.1% for the largest AVB wear indication returned to service,
- 37.8% for the largest undetected AVB wear indication,
- 52.3% for the largest TSP wear indication returned to service,
- 50.2% for the largest undetected TSP wear indication, all based on the array coil after an 8.0 EFPY operating interval. The OA also concludes that the structural and leakage integrity performance criteria will be maintained for both a 3-and 4-cycle inspection interval for all degradation
Page 24 of 25 mechanisms observed. The OA calculations use a conservative simplified analysis technique with a mixed strategy of projecting the worst-case degraded tube and combining uncertainties. NDE uncertainties are applied at the 95th percentile to the largest flaw left in service. Growth rates are determined using the 95th percentile of site-specific point-to-point growth data between the previous and current inspection, or conservatively determined from historical site-specific data and new indication growth data that produces a higher growth rate than observed from the current point-to-point results. Undetected flaws are considered in the OA with an assumed depth equal to the 95th percentile using MAPOD software with EPRI ETSS specific voltage-depth correlation and bounding site-specific noise measurements from the current inspection inputs.
A top of tubesheet deposit cleaning process was performed in all SGs during Prairie Island U2R32. There are two main purposes of the cleaning process.
The first is to remove hardened deposits that tend to form at the top of the tubesheet and the second is to force and filter out any loose parts or foreign objects that have migrated to the SG secondary side during operation. The mass of deposit material and debris removed by the top of tubesheet cleaning process was 10.75 lbs. in SG21 and 8.44 lbs. in SG22. Review of the system in-line filters was performed following the tubesheet cleaning process. There were no metallic objects deposited on the filter. The subsequent secondary side visual inspections showed the tubesheet to be essentially free of deposits with only a limited hard sludge pile region present in hot legs of both SGs spanning several tubes in the low flow region near the center of the bundle. In addition, a wire was discovered and retrieved during the FOSAR evolution. The wire (presumed to be wire feed filler metal from welding during SG fabrication) did not cause any tube damage based on visual and follow-up eddy current testing with the combination bobbin/array probe.
Visual inspections were performed of the SG channel head bowl in both SGs.
These inspections are performed based on industry operating experience and guideline requirements. Visual inspections of the SG hot leg and cold leg divider plate, inclusive of the entire divider plate to channel head weld and all visible clad surfaces, were performed in accordance with the latest revision of Westinghouse NSAL-12-1. This inspection was performed using the SG manway channel head bowl cameras. Satisfactory inspection results were observed in both SGs with no indications of corrosion or cladding damage observed. Further, all previously installed tube plugs were also visually inspected by remote video camera from the primary side in each SG. The inspection results were satisfactory and showed no indication of tube plug leakage or failure.
Page 25 of 25 LEGEND OF FIELDS AND CODES FIELD EXPLANATION TUBE #
Distinct ROW/COL combination within each Table IND #
Distinct ROW/COL/LOCATION combination within each Table ROW Row number of tube location COL Column number of tube location VOLTS Measured Voltage PCT Measured percent through wall IND Three Digit Code - see below LOC Location of landmark - see below ELEV Measurement in inches from the center of the landmark to the center of the indication LENGTH Calculated Indication Length PROBE Probe Coil Type - Array, Bobbin or +Point' UTIL1 Clarifying Codes - see below UTIL2 Clarifying Codes - see below UTIL3 Clarifying Codes - see below FIELD CODE EXPLANATION IND AVB Anti-Vibration Bar VOL Volumetric WAR Wear LOC 0?H
? = First through Eighth tube support plate on hot leg side AV?
? = First through Ninth anti-vibration bar 0?C
? = First through Eighth tube support plate on cold leg side UTIL1 DQA Data Quality Acceptable DlL Data Quality Acceptable and Limited Array Coverage WAR Wear UTIL2 TPR Tapered wear LAC Limited Array Coverage UTIL3 CBA Confirmed By Array coil LAC Limited Array Coverage NBC No Bobbin Call NCA Not Confirmed by Array coil