LIC-05-0118, Generator Eddy Current Test Report - 2005 Refueling Outage

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Generator Eddy Current Test Report - 2005 Refueling Outage
ML052700162
Person / Time
Site: Fort Calhoun Omaha Public Power District icon.png
Issue date: 09/23/2005
From: Faulhaber H
Omaha Public Power District
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
LIC-05-0118
Download: ML052700162 (20)
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Omaha Pubfic PowerDistrc 444 South 16th Street MAfll Omaha NE 68102-2247 September 23, 2005 LIC-05-0118 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

Reference:

Docket No. 50-285

SUBJECT:

Fort Calhoun Station (FCS) Steam Generator Eddy Current Test Report -

2005 Refueling Outage Pursuant to FCS Unit No. 1 Technical Specification 3.17(5)(ii), Omaha Public Power District (OPPD) submits the attached FCS Steam Generator Eddy Current Test Report, which summarizes testing performed during the Spring 2005 Refueling Outage.

If you have any questions or require additional information, please contact Joe Mathew at (402) 533-6652. No commitments are made to the NRC in this letter.

Sincerely, aulhaber Division Manager Nuclear Engineering HJF/JKM/mle

Attachment:

Fort Calhoun Station Steam Generator Eddy Current Test Report, 2005 Refueling Outage ID Employment with Equal Opportunity 4 17 1

LIC-05-O1 18 Attachment Page 1 FORT CALHOUN STATION STEAM GENERATOR EDDY CURRENT TEST REPORT 2005 REFUELING OUTAGE

LIC-05-0118 Attachment Page 2 FORT CALHOUN STATION STEAM GENERATOR EDDY CURRENT TEST REPORT 2005 REFUELING OUTAGE Introduction This report summarizes steam generator eddy current test results obtained during the Fort Calhoun Station (FCS) 2005 Refueling Outage (RFO). The Omaha Public Power District (OPPD) submitted summaries of results of the two previous eddy current inspections to the NRC in the following documents:

Description of FCS Steam Generators The OPPD FCS Station is a two-loop Combustion Engineering design nuclear steam supply system (NSSS). Each steam generator contains 5005 vertical tubes fabricated from Alloy 600 material. The tubes are nominally 3/4 inch outside diameter with a nominal tube wall thickness of 0.048 inches, and are installed in the tubesheet in a 1-inch pitch, triangular array. The tube to tubesheet joints are full tubesheet depth explosively expanded and are seal welded at the primary face of the tubesheet. The operating temperature (Thot) is 596'F.

All tube supports in the FCS steam generators are carbon steel material. With the exception of the upper most support, all supports of the vertical tube run are of the eggerate lattice type with drilled tube hole Drilled Support Plates at the 90 degree and 270 degree orientations. The upper most support at elevation 8 is a partial plate with drilled tube holes. Tube holes in drilled supports are 0.765-inch diameter (nominal) providing a nominal annular clearance around the tubes of 0.0075 inch. Drilled plate support segments include 0.25 inch drilled flow holes nominally in the center of each triangular array of three tubes. Of the 5005 tubes in each steam generator, 975 tubes pass through one or more one-inch thick drilled plate supports. The remainders are supported totally by eggcrate lattice support structures. The eggcrate structures are fabricated from interlocking 0.090-inch thick strips of alternating 2 inch and 1 inch widths. The eggcrate supports provide a robust structure, while at the same time providing an open configuration with minimum flow resistance. Freedom of flow through the area adjacent to the tube increases the flushing capability to reduce potential for deposit loading.

The horizontal sections of the double 90-degree U-bends are supported by three vertical strips welded to diagonal strips, which pass nominally through the center of the 90-degree bends. The vertical and diagonal strip subassemblies serve as spacers between each line of tubes. The vertical and diagonal strips are 0.090 inch thick and 4 inches wide. The vertical strips are connected to three horizontal, structural I-beams, which in turn are connected to the tube bundle shroud. Additionally, 1-inch thick

LIC-05-01 18 Attachment Page 3 horizontal scalloped bars pass between each row of tubes and interlock with the vertical strips to provide a rigid structure designed to resist postulated accident induced loads.

The FCS steam generators have operated for over 30 years and accumulated 23.33 EFPY by the '05 RFO outage. Before the 2005 RFO, 648 tubes have been plugged or approximately 6.5% of the total number of the original tubes.

Scope of Examination Westinghouse conducted in-service nondestructive examinations of the steam generator (SG) tubing at Omaha Public Power District's Fort Calhoun Station Nuclear Power Plant in March of 2005. The examinations were performed to assess the condition of the Steam Generators, identify tubes requiring repair, and to provide the necessary information needed to fulfill Technical Specification requirements.

The examination program included multi-frequency bobbin testing for indications of degradation or dents and motorized rotating plus point coil testing for axial and circumferential cracking and further evaluation of detected bobbin indications.

The Eddy Current data was acquired using Westinghouse's ANSER Data acquisition software. The data was reviewed by EPRI Qualified Data Analysts (QDAs) for data quality and converted to Zetec's Eddynet) format for final data analysis.

The converted eddy current data was transmitted from the site by T-1 data lines to the Westinghouse (primary analysis) data room at the Waltz Mill facility in Madison, PA and the ANATEC International (secondary analysis) data room in San Clemente, CA where it was independently analyzed by these two groups of analysts. In addition to the primary and secondary analysis, ANATEC preformed a tertiary analysis on the Bobbin Data by using Computerized Data Screening (CDS). This third analysis was to screen for large indications, which minimizes the possibility of missing a significant flaw due to human error. Analysis results were then transmitted to Fort Calhoun where discrepancies between the production analyses were resolved by two groups of Level III Resolution Analysts representing primary and secondary analysis groups. All data analysts were certified to a minimum of ECT Level IIA, QDA certified (EPRI Qualified Data Analyst). Data Analysts received familiarization training on the Fort Calhoun data during the Data Analyst Indoctrination. The DA Indoctrination included lessons learned from previous exams at Fort Calhoun as well as other relevant industry experience. Optical disks with data from Fort Calhoun, similar CE plants, and Indian Point Unit 2 were also available for review. Data analysts were qualified by a written test and a proficiency examination on Fort Calhoun data and supplementary data from Maine Yankee and Indian Point Unit 2 for damage mechanisms not detected to date at Fort Calhoun.

In addition to OPPD's Steam Generator Program Manager, OPPD was represented by three (3) ECT Level III, two (2) from MoreTech and one (1) from Arizona Public Service. They performed as Independent QDAs (IQDA), who were not part of the Primary, Secondary, or Resolution analysis teams. The number of IQDA's was increased from the two that were used last outage to three to ensure that a rigorous review of the data could be completed in a timely manner These analysts were responsible for review, comments and changes to the Analysis Procedure, and for review of all

LIC-05-01 18 Attachment Page 4 acquisition and analysis technique sheets. The Independent QDAs reviewed all "I" codes which had been dispositioned to NDD by the Resolution team. They were also responsible for randomly sampling inspection results to ensure proper disposition of resolved indications, to ensure proper reporting, to review repairable indications, and to review and disposition calls which were contested by either the Primary or Secondary analysts. The duties of the Independent QDAs were in accordance with EPRI PWR Steam Generator Examination Guidelines, Revision 6.

In addition to the Eddy Current Data Acquisition and Data Analysis personnel, a Tube Integrity Engineer, a Condition Monitoring Consulting Analyst, a Data Sizing Analyst, and an Independent Technical Reviewer were part of the Steam Generator Inspection Team.

The Inspection Plan listed below was developed from the Degradation Assessment (DA) for the 2005 Outage.

The DA identified the following Existing Degradation Mechanisms at FCS:

  • Tube Support Denting (Potential Degradation Precursor)
  • Circumferential ODSCC near Eggcrate / Plate Intersections
  • Circumferential ODSCC at Expansion Transitions
  • Axial ODSCC at Drilled Support Plate Intersections and Dented Eggcrates
  • Axial ODSCC at Free-Span Critical Area
  • Axial ODSCC at Free-Span and Undented Eggcrates
  • Axial ODSCC at Top of Tubesheet (Sludge Collar)
  • Volumetric Indications
  • Pitting
  • Loose Part Wear / Damage Potential Degradation Mechanisms include:
  • Rows 1 - 4 U-Bend Cracking (ID and OD)
  • Axial ODSCC at the 90 Degree Bends
  • PWSCC in Tubesheet Expansion Transitions
  • Axial and Circumferential ODSCC in Tubesheet Crevices
  • Axial and Circumferential PWSCC in the Tubesheet Region of Expanded Tubes
  • Mechanical Wear at Tube Supports
  • ODSCC at Free Span Dings Bobbin Probe:

One hundred percent (100%) of all open tubes were tested with a 0.560-inch diameter bobbin probe.

Tubes restricted to the 0.560-inch diameter probe were tested from both hot and cold side as far as possible. The restricted region was tested with a plus point probe. If the full length of a tube could not be completely inspected by a combination of the 0.560 bobbin probe and MRPC plus point it would have been plugged. No tubes required plugging for an incomplete inspection. Bobbin testing was

LIC-05-0118 Attachment Page 5 conducted to detect Support Denting, Loose Part Wear, Volumetric Indications, Pitting, Axial ODSCC at Non-dented Eggcrates, Free Span, Top of Tubesheet (Sludge Collar), Dings < 5 Volts, Mechanical Wear at Tube Supports and Axial PWSCC at drilled tube supports plates.

Motorized Rotating Probe Coil (Plus Point@):

100% of tubes at the Hot Leg Top of Tubesheet +3"to -12" were tested for; Circ ODSCC, Axial ODSCC, Volumetric, Mechanical Wear from loose parts, Circ PWSCC, and Axial PWSCC 100% of Hot Leg drilled support intersections were tested for: Circ ODSCC, Axial ODSCC, Mechanical Wear from loose parts or support structure and Axial PWSCC.

100% of tubes in the Freespan Critical Area from H5 to DBH were tested for Axial ODSCC, Loose Part Wear.

100% of Hot Leg eggcrate / drilled plate intersections, eggcrate +3" to -6" were tested for freespan Circ ODSCC 100% of Hot Leg eggcrate supports with dents >3 volts were tested for Circ ODSCC, Axial ODSCC, Mechanical Wear from lose parts or support structure and Axial PWSCC.

100% of Vertical Supports VI, V2, V3, and DBH and DBC with dents > 3 volts were tested for Circ ODSCC, Axial ODSCC, Mechanical Wear from support structure and Axial PWSCC.

100% of Hot Leg square bends in Critical Area were tested for Axial ODSCC at 90 degree Bends.

100% of Rows 1-2 U-bends were tested with a high frequency Plus Point for: Circ PWSCC and Axial PWSCC Rows 1-4 U-bends 77 tubes in SG RC-2A, and 73 tubes in SG RC-2B with medium frequency Plus Point for: Circ ODSCC, Axial ODSCC, and Axial PWSCC to complete 100% inspection in 60 EFPM 100% of Hot Leg Freespan Dings > 5 volts, were tested for: Circ ODSCC, and Axial ODSCC 100% of all Bobbin I-codes were tested for Loose Parts Wear, Volumetric Indications, Pitting, ODSCC at Expansion Transitions, Drilled Plate Supports, Axial ODSCC at Top of Tubesheet (Sludge Collar),

Drilled Support Plate Intersections, Dented Eggcrates, Free Span Critical Area, Free Span and Non-dented Eggcrates, and Axial PWSCC at Tube Supports.

20% of indications dispositioned by plus point history for confirmation of the validity of Dispositioned by History (DBH) of bobbin calls that have not changed.

LIC-05-0118 Attachment Page 6 Inspection Plan Expansions

1. Expansion of hot leg critical area in SG A due to one indication found in freespan critical area buffer. Twenty-three (23) additional tubes were tested. No additional indications were detected.
2. The H4 tube support plate was one tube line higher than in the NDE plan so a line including 19 tubes was added Inspection Equipment And Techniques Westinghouse Electric Company performed the nondestructive examination (NDE) of the steam generator (SG) tubes. The following components are required to perform Eddy Current testing: an Eddy Current tester, a remote positioning device, and an eddy current probe drive control system. The state-of-the-art equipment used at OPPD during the 2003 outage for the Eddy Current Testing (ECT) included the Zetec MIZ-70E digital ECT tester. The Flat Rail GENESIS robot manipulator equipped with the Vision Tube Locating system is used to position the probe at the tubes. Probes are inserted and withdrawn using a Zetec IOD probe pusher equipped with a Westinghouse probe encoders and the Westinghouse Single Probe Pusher Control (SPPC) system. The software that was used for acquisition was the Westinghouse's ANSER Data Acquisition software. The raw data was converted to Zetec's Eddynet980 for data analyst and interpretation.

The ECT probes used included a standard bobbin probe (A560M/ULC), and the beaded combo probe (A560 M/ULC/C) for the full-length and partial length inspections.

The frequencies used for the bobbin examination are as follows:

400 kHz differential and absolute 200 kHz differential and absolute 100 kHz differential and absolute 35 kHz differential and absolute 400/100 kHz differential support ring mix 400/100 kHz absolute support ring mix 400/200/100 kHz differential mix for Tubesheet Expansion Suppression The primary frequency of 400 kHz satisfies the requirements of the ASME Boiler and Pressure Vessel Code for the examination of nonferromagnetic steam generator tubing. A technique using the differential support mix and a voltage base of 2.75 volts on the 20% OD ASME signal was used to perform dent sizing consistent with current industry techniques. The 100 kHz is provided for the confirmation of flaw indications and as a frequency used in the mixes to eliminate support and OD deposit signals. The 100 kHz absolute detects gradual wall thickness variations. The 200 kHz frequency is for confirmation of flaw indications. The 35 kHz is provided to facilitate locating the probe position in the steam generator. The 400/100 kHz differential mix is used to eliminate the tube support signal and OD tube deposits. The 400/100 absolute mix is used to detect gradual wall loss.

Bobbin exams were conducted to conform to EPRI Rev. 6 Appendix H; ETSS #s 96008.1 Rev. 13, 96005.2 Rev. 8, 96012.1 Rev.9, 96004.1 Rev.9, and Westinghouse document # SG-99-03-005. The

LIC-05-0118 Attachment Page 7 400/200/100 differential mix for Tubesheet Expansion Suppression is used to screen the cold leg tubesheet interface for loose part damage.

Three coil motorized rotating coils were used at the hot leg top-of-tubesheet and to investigate bobbin indications. Various versions of the rotating coil probe were used to inspect the vertical runs, horizontal runs, and square bend sections as required. Low row U-bends were also inspected with rotating coil technology.

Top-of Tubesheet exams were conducted to conform to EPRI Rev. 6 Appendix H ETSS #s 21409.1 Rev.2, 21410.1 Rev.3, 20510.1 Rev.4, and 20511.1 Rev. 6 The frequencies used for the 3 coil (P115A, PPl lA, P080B), top-of-tubesheet examination are as follows:

700 kHz High-Freq. Pancake coil 400 kHz Pancake, Mid-Freq. Plus PT. coil, and High-Freq. Pancake coil 300 kHz Pancake, and Mid-Freq. Plus PT. coil 100 kHz Pancake, and Mid-Freq. Plus PT. coil 20 kHz Pancake, and Mid-Freq. Plus PT. coil Plus point exams were conducted to conform to EPRI Rev. 6 Appendix H ETSS #s 21409.1 Rev.2, 21998.1 Rev. 2, 22841.3 Rev. 3, 22842.3 Rev. 3 and 96703.1 Rev. 13. The frequencies for the 2 coil (2-PP 1lA) modular probe were as follows:

400 kHz High-Freq. Plus PT. coil 300 kHz High-Freq. Plus PT. coil 100 kHz High-Freq. Plus PT. coil 20 kHz High-Freq. Plus PT. coil Plus point exams were conducted to conform to EPRI Rev. 6 Appendix H ETSS #s 21409.1 Rev.2, 21998.1 Rev. 2, 22841.3 Rev. 3, 22842.3 Rev. 3 and 96703.1 Rev. 13. The frequencies for the 2 coil (P1 15A, PPI lA) Flex probe MRPC examinations were as follows:

400 kHz Pancake, and Mid-Freq. Plus PT. coil 300 kHz Pancake, and Mid-Freq. Plus PT. Coil 200 kHz Pancake, and Mid-Freq. Plus PT. coil 100 kHz Pancake, and Mid-Freq. Plus PT. coil 20 kHz Pancake, and Mid-Freq. Plus PT. Coil Plus point exams were conducted to conform to EPRI Rev. 6 Appendix H ETSS #s 96511.1, 96511.2 Rev. 13. The frequencies used for the single coil (PP1 lA) mid-frequency U-bend examinations were as follows:

400 kHz Mid-Freq. Plus PT. coil 300 kHz Mid-Freq. Plus PT. coil 200 kHz Mid-Freq. Plus PT. coil 100 kHz Mid-Freq. Plus PT. coil

LIC-05-01 18 Attachment Page 8 20 kHz Mid-Freq. Plus PT. coil Plus point exams were conducted to conform to EPRI Rev. 6 Appendix H ETSS f 99997.1 Rev. 7.

The frequencies used for the single coil (PP9A) high frequency U-bend examinations were as follows:

800 kHz High-Freq. Plus PT. coil 600 kHz High-Freq. Plus PT. coil 400 kHz High-Freq. Plus PT. coil 300 kHz High-Freq. Plus PT. coil The recorded multi-frequency eddy current data is analyzed by two independent teams of data analysts for the presence of flaw indications and dents. Discrepancies between the two sets of evaluation results are reviewed and dispositioned by the resolution analysts. Primary and Secondary analyst feedback was accomplished through the use of the Analyst Performance Tracking Software. The primary and secondary analysts were required to review all missed calls and a sample of overcalls. If there were any calls which were dispositioned as requiring no further action by the resolution team, which the primary or secondary analyst felt should have remained, that analyst could appeal the call and the appeal was then assigned to the independent Level III QDA for final disposition.

The bobbin probe is used primarily as a screening tool to flag indications for further evaluation by means of historical reviews and/or additional testing with rotating coil technology. All of the data for all examined regions was analyzed. Indications left in service have been determined to be either non-reportable or manufacturing related through the use of diagnostic testing and historical reviews.

Indications were not left in service based on depth sizing estimates.

Bobbin testing was performed mainly from the outlet side of each S/G. Bobbin test speeds ranged from 12" to 36" per second and varied depending on presence of dents or low row diameter restrictions.

Bobbin test sampling rates were within the requirements of the EPRI Appendix H approved techniques. The .560 diameter probe was used on all open tubes. Some tubes could not be test full length with the bobbin coil because of restrictions (dents). Any tube with a restriction was tested to the extent possible from both, outlet and inlet sides, any area that could not pass the bobbin coil was tested

'with Plus Point MRPC probe.

MRPC test speeds also varied depending on test location and probe type. Test speeds were from .1" to

.7" per second axially with the sampling rate adjusted in accordance with EPRI Appendix H Qualified Techniques as detailed in analysis procedure.

Inspection Results As a result of the inspection, several conclusions can be derived as follows:

Single Axial Indications (SAI) and Multiple Axial Indications (MAI) are linear indications that are parallel to the length of the tube or axially oriented. There were 109 SAI (52 in S/G RC-2A & 57 in S/G RC-2 B) and 3 MAI (all MAI's were in S/G A) for a total of 112 Axial indications. These indications were reported by the data analyst at various elevations of both steam generators. Fifty-

LIC-05-0118 Attachment Page 9 three (53) of the Indications were "freespan" (FS) or between supports, 23 indications were at Drilled Support Plates (DSP), 13 indications were at Eggcrate (EC) supports structures and 23 indications were within 2 inches of the top of the hot leg tubesheet (HTS). The majority of the indications reside between H5 and H8 in the critical area where the partial tube support plates are superpositioned.

Fifteen (15) indications were greater than 40% (as sized by plus point amplitude). Of these 8 were detected by the bobbin coil. A majority of the indications (89 of 112) were transparent to the bobbin coil and were detected with the more sensitive rotating plus point coil. The deepest indication, which was not detected by the bobbin coil, was 50% (as sized by plus point amplitude). Historical data reviews from the RFO-03 inspection were conducted by the senior analyst during the course of the RFO-05 examination. Of the 112 indications, all were reviewed to determine whether the flaw was present and if so, did it appear to grow. Fifty-seven (57) indications showed no growth, 37 showed growth, 9 showed marginal growths. The remaining 9 indications were detected by the bobbin coil and sized by the plus point coil. They were not reviewed because that area of the tube had not been tested by plus point in 2002 or 2003. The number of indications reported in documents, like the Condition Monitoring Assessment (report # SG-SGDA-05-1 1) and Operational Assessment for Cycle 23 (report

  1. SG-SGDA-05-26), were adjusted; if the ECT graphics indicated that indications were close together axially and co-linear, then they were considered one indication with a size that enveloped the multiple ECT indications.

Single CircumnferentialIndications (SCI's) are linear indications perpendicular to the length of the tube or circumferentially oriented. Fourteen (14) SCI indications were reported, (12 in S/G RC-2A & 2 in S/G RC-2B) 12 of the indications were ODSCC and 2 were PWSCC. Five (5) of the indications were at the top of the hot leg tubesheet (HTS), 4 were in S/G RC-2A and 1 indication in S/G RC-2B, of the 4 in S/G RC-2A, 2 were PWSCC. One (1) indication in S/G RC-2A just above the 6h support was considered freespan because it is not encompassed by a support structure. This tube was in the Drilled/Eggcrate support Overlap critical area. The remaining indications were at various hot leg drilled support plates. Several circumferential indications at drilled support plates appeared to be a series of parallel circumferential cracks over an axial distance nearly the length of the support thickness. The maximum circumferential extent of the HTS indications was 67 degrees for the ODSCC indications and 31 degrees for the PWSCC. The maximum indicated depth by plus point phase analysis for the HTS indications was 57% through-wall for the ODSCC and 65% for the PWSCC. The maximum circumferential extent of the drilled support plate indications was 129 degrees and the maximum indicated depth by plus point phase analysis was 85% through-wall. The 1 freespan indication had a circumferential extent of 46 degrees and a max depth of 49%. Of the 8 SCI indications reported at drilled supports, 4 are associated with a dent from the bobbin coil. The dent voltages range from 10.49 volts to 32.54 volts. Nine (9) of the indications show growth from the last cycle, 1 showed marginal growth, and 4 showed no growth.

Single Volumetric Indications (SVI) are band or patch like indications. Two (2) SVI's were reported (1 in S/G RC-2 A and 1 in S/G RC-2 B). Both indications were at eggcrate supports and showed no change from 2003 data. The indication in S/G A was located at the first cold leg support structure on a peripheral tube and is presumed to be wear. The indication in S/G B was located at the 7th hot leg support structure. This is the region where axial ODSCC occurs and the damage mechanism, which produced the ECT indications, is presumed to be a patch of inter-granular attack (IGA)

LIC-05-01 18 Attachment Page 10 Circumferential Volumetric Indication (CVI) A circumferential band of wall loss, which occurs at the cold-leg tube sheet expansion transition. Four (4) tubes were reported with CVI indications (2 in S/G RC-2 A and 2 in S/G RC-2 B). The degradation mode is believed to be pitting.

Noisy Tube (NSY): Any undesired signal or signals that may obscure for interpretation those signals that are of interest. Two (2) tubes in S/G RC-2A were plugged because the tube noise was identified as a potential concern for masking critical flaws.

All indications were compared to the respective structural integrity and leakage limits defined in the degradation assessment. All indications were significantly below the limits demonstrating that the condition monitoring limits are satisfied. Based on the NDE inspection results, all tubes in Steam Generators RC-2A and RC-2B met the tube structural and leakage integrity requirements of NEI 97-06 during Cycle 22 All of the tubes with the above indications were repaired by plugging. A total of 52 tubes were plugged in S/G RC-2A and 51 tubes were plugged in S/G RC-2B with indications, there were 2 tubes preventively plugged in S/G RC-2A because of noisy areas that may mask a critical size flaw. A total of 105 tubes were plugged this outage 54 in S/G RC-2A and 51 in S/G RC-2B.

LIC-05-01 18 Attachnient Table 1 Page I11 Steam Generator Indication Listin2 bv Location

__ _ _ _ _ _S/G A _ _ __ _ _S/G B Location SAI MAI SCO SVI CV NSY SAI SCO SVI CVI Totals HTS 8 4 __ _ 1 12 1 _ _ _ _ 26 HI 7 1 _ _ _ 6 _ _ _ _ 14 H2 1I_ _ _ _ _ _ _ _ _ 3 4

H 2+ - _ _ _ _

H3 2 __ _ _4 _ _ _ _ 6 H 13 + ._ _I' - _ _ _ _ I H4 __ _ _4 _ _ _ _ 4 114+;',

115 2 __ _ _ 2 4

_ _ _ _ _ 1A_.3. _ .

H6 4/1 4 __ __ 5 __ 14 117 3 1 _ _ _ 2 1 7 H17+ ' 13 /_ 2' _ _ 2 A,- -- 17 .

H8 1 1 _ _ _ _ _ _ _ _ _ _ _ 3 1 _ _ _ _ 6

,H8+ _ _

D B II_ _ __ _ _ __H_ _

D BH + -- - -,, ' _ _ -

V2+ .

V3 _ _ _ _ _ _ _ _ _ _

V3+ -- __ _

D BC __ _ _ ... .. _

D BC-__ _-. _ _-

C 8+_ _ __ _ __ _ __ _ _

C7 +_ _ __ _ __ _ _

C 6+ _ _ __ _ __ _ __ _ _

C5+ 1_ _ _

C 4+_ _ _ __ _ __ _ _ __ _ _

C3+__ _

C2+_ _ __ _ _

C2' C 1+_ _ __ _ __ _ _

C l ,-1_ __ _ _

C TS+_ _ __ _ __ _ _

CTS _ _ 2_ _ _ 4 TOTALS 152 /3 12 1 2 2 57 2 1 2 134

__ __ _ SAI /MAI SCI SVI CV NSY SAI SCI SVI CV _ _ _

LIC-OS-O 18 Attachment Page 12 Table 2 As Is TM n - A Spnng NUU) Outa e n - - - Flint A--s - - -

WUJ KU-LikA 2003 2005 Bobbin call P1 2005 MRPC Circ. Critical MRPC/

Row Line Call call Volts Deg % Deg Axial Layers Dent Area Sup Change 1 84 27 TBP NSY HTS +.76 1.86 no no no HTS 2 24 39 DSI 1.53V 96D 111-0.67 SAI H1 -0.81 1.16 96 63 n/a 0.45 no no no EC no test 3 32 41 SAI H6 +0.73 0.42 108 41 n/a 0.2 no 10.8v no EC Yes 4 89 46 DFI 0.72 88D H7 +1.59 SAT H7 +1.53 0.23 72 29 n/a 0.32 no no yes DSP Yes 5 92 51 Delta Coil Confirmed SCO H6 +2.97 0.24 107 49 46 n/a yes no yes FS Yes 6 98 51 SAI H2 +1.38 0.21 112 26 n/a 0.48 no no yes DSP No 7 87 52 SAI H7-0.30 0.49 107 29 n/a 0.32 no 30.8v yes DSP No 8 28 53 SAI HTS +1.17 0.15 102 25 n/a 0.22 no no no HTS Yes 28 53 SAT HTS +1.42 0.2 77 26 n/a 0.16 no no no HTS No 28 53 SAT HTS +1.57 0.33 108 33 n/a 0.22 no no no HTS No 9 94 53 SAI H6 +21.15 0.19 107 27 n/a 0.29 no no yes FS no 94 53 SAI H6 +21.97 0.23 102 30 n/a 0.2 no no yes FS no 94 53 SAI H7 +14.92 0.26 103 32 n/a 0.35 no no yes FS yes 10 96 53 SAI H7 +11.10 0.13 109 24 n/a 0.34 no no yes FS yes 11 89 54 SAI H7 +11.87 0.3 106 32 n/a 0.28 no no yes FS yes 89 54 SAI H7 +13.98 0.23 112 29 n/a 0.3 no no yes FS yes 12 91 54 SAI H7 +1.15 0.13 104 24 n/a 0.51 no 15.32v yes FS yes 91 54 SAT H7 +6.77 0.18 94 27 n/a 0.39 no no yes FS yes 13 86 55 SCO H8 -0.03 0.3 82 85 77 n/a yes 21.1v yes DSP marginal 14 88 55 SAI H6 +1.07 0.34 97 33 n/a 0.54 no 12.73v yes FS yes 15 98 55 MAI H7 +15.15 0.57 115 45 n/a 0.7 no no yes FS marginal 98 55 SAI H6 +19.05 0.19 93 29 n/a 0.39 no no yes FS yes 98 55 SAI H7 +10.14 0.17 115 27 n/a 0.36 no no yes FS no 98 55 SAI H7 +9.12 0.15 110 26 n/a 0.86 no no yes FS no DFI 0.27V 114D 16 24 57 HTS+0.6 SAT HTS +0.70 0.29 103 31 n/a 0.28 no no No HTS marginal 17 98 57 SAT H6 +21.15 0.61 81 50 n/a 0.69 no no yes FS yes 98 57 DFI 0.73V 114D SAT H7 +14.98 0.25 111 33 n/a 0.98 no no yes FS yes

LIC-OS-O 18 Attachment Page 13 Table 2 Snring 2005 Outage S/G RC-2A 2003 2005 Bobbin call P1 2005 MRPC Circ. Critical MRPC/

Row Line Call call Volts Deg % Deg Axial Layers Dent Area Sup Change 116+21.18 DSI 0.36V 65D 18 103 58 111+0.17 SAT H1 +0.00 0.2 103 27 n/a 0.59 no no no DSP yes DSI 1.00V 100D 19 70 59 111+0.96 SAT H1+0.88 0.44 107 35 n/a 0.48 no no no EC no test 20 11 62 SAT HTS +0.39 0.19 86 27 n/a 0.16 no no no HTS no 21 89 62 SAI H6 +6.66 0.2 101 30 n/a 0.95 no no yes FS no 89 62 DFI 0.54V 58D SAT H6 +8.00 0.34 86 39 n/a 0.95 no no ye FS no 89 62 DFI 116+1.00 to 9.11 SAT H6 +9.33 0.25 95 33 n/a 0.73 no no yes FS no 22 93 62 MAT H7 +2.41 0.34 103 38 n/a 1.57 no no yes FS yes 23 97 62 SAT H7 +10.24 0.16 105 25 n/a 0.47 no no yes FS no 97 62 SAT H7 +11.00 0.17 111 26 n/a 0.57 no no yes FS no 97 62 SAT H7 +12.18 0.14 91 24 n/a 0.17 no no yes FS no 24 82 63 SAT H1 +0.02 0.21 97 28 n/a 0.29 no no no DSP no 25 86 63 SAT H6 +1.39 0.35 100 27 n/a 0.32 no no yes FS yes 26 88 63 SAT H6 +9.41 0.19 98 26 n/a 0.47 no no yes FS no 27 89 64 DFI 0.67V 67D H6+2.46 SAT H6 +2.22 0.22 107 28 n/a 0.44 no no yes FS no 28 32 65 MAI H6 +0.50 0.82 116 49 n/a 0.19 no 5.2v no EC no 29 86 65 SAT H6 +1.41 0.2 94 21 n/a 0.23 no 38.18v yes FS no 86 65 DFI 0.39V 52D H6+9.19 SAM H6 +9.19 0.28 106 27 n/a 0.53 no no yes FS no 30 75 66 SAI H5 +32.57 0.16 93 28 n/a 0.74 no no yes FS no 31 89 66 SAI H3 +0.17 0.14 110 23 n/a 0.26 no no no DSP no 32 91 66 SAT H7 +4.11 0.12 92 21 n/a 0.45 no no yes FS yes 33 14 67 SCO HTS +0.14 0.18 81 57 67 n/a no no no HTS no DEI 2.57V 91D 34 32 67 CTS+0.33 CVI CTS +0.02 0.19 95 29 154 0.29 no no no CTS no test 35 102 67 SCI H6 +0.23 0.41 118 40 129 n/a yes no yes DSP no 36 91 68 SAT H5 +0.22 0.26 101 33 n/a 0.58 no no yes DSP marginal

LIC-OS-O 18 Attachment Page 14 Table 2 Snring 2005 Ontafe S/GTRr-2A 2003 2005 Bobbin call P1 2005 MRPC Circ. Critical MRPC/

Row Line Call call Volts Deg % Deg Axial Layers Dent Area Sup Change 91 68 SAI H7 +15.52 0.18 104 28 n/a 0.62 no no yes FS yes 37 101 68 SCI H7 +0.29 0.36 105 53 114 n/a yes no yes DSP yes DEI 6.64V 89D 38 36 69 CTS+0.10 CVI CTS +0.03 0.28 86 34 307 0.22 no no no CTS no test 39 25 70 SAI HTS +0.85 0.14 107 23 n/a 0.34 no no no HTS marginal 40 88 71 SAI H5 +0.81 0.28 103 27 n/a 0.4 no 5.22v yes FS no 41 100 71 SCI H6 +0.22 0.36 123 21 97 n/a yes no yes DSP no 42 93 72 SAI H8 -0.65 0.58 103 44 n/a 0.43 no 29.9v yes DSP no 93 72 SCI H6 -0.04 0.89 118 37 32 n/a yes 29.2v yes DSP no 43 96 73 SAI H3 +0.05 0.14 101 24 n/a 0.23 no no no DSP no 44 45 74 TBP NSY C5 +19.05 10.1 no no no FS 45 101 74 SCI H6 +1.84 0.32 115 38 90 n/a no no yes DSP yes 46 92 81 SCI E1 +1.69 0.28 97 62 27 n/a no 32.5v ye DSP yes DSI 0.68V 107D 47 71 82 H1+0.47 SAI H1 +0.37 0.44 93 36 n/a 0.29 no no no EC yes 48 23 84 SAI HTS +0.68 0.18 82 27 n/a 0.12 no no no HTS no 23 84 SAI HTS +0.79 0.21 88 30 n/a 0.21 no no no HTS no 49 10 89 SCI HTS +0.10 0.19 100 57 44 n/a no no no HTS 50 14 99 DSI 0.57V 69D Hl-0.53 SAT H1 -0.63 0.3 101 31 n/a 0.38 no no no EC SCI HTS -0.07 51 18 101 ID 0.46 22 53 31 n/a no no no HTS yes SCI HTS -0.11 52 27 104 ID 0.68 24 65 27 n/a no no no HTS yes DSI 1.31V 118D 53 6 107 HI+0.91 SAL 1+0.87 0.29 63 31 n/a 0.26 no no no EC no test DSI 1.32V 105D 54 6 125 C1+0.00 SVI C1 -0.12 0.92 75 55 83 0.5 no no no EC no

LIC-OS-O 18 Attachment Page 15 Table 3 Snrinfz 2005 Outage S/G RC-2B 2003 2005 Bobbin call P1 2005 MRPC Circ. Critical MRPC/

Row Line Call call Volts Deg % Deg Axial Layers Dent Area Sp Change T 71 22 DSI 0.66V 90D H3+0.29 SAI H3 +0.40 0.54 85 44 n/a 0.48 no no no EC no test 2 64 23 SCI HTS +0.13 0.34 117 35 53 n/a no no no HTS yes DSI 1.12V 122D HI-3 67 24 0.53 SAT H1 -0.64 0.68 95 48 n/a 0.63 no no no EC yes 4 78 27 SAI H3 +3.04 0.28 108 33 n/a 0.39 no no no FS yes 5 76 35 Retest Delta Coil SCI H8 -0.19 0.42 112 28 94 n/a yes no no DSP yes 6 92 43 SAI H8 +0.09 0.14 93 28 n/a 0.38 no no ye DSP marginal 7 92 49 SAI H7 +8.67 0.27 98 36 n/a 0.63 no no yes FS yes 8 100 49 SAT H3 +0.04 0.18 82 27 n/a 0.2 no no no DSP yes 9 91 50 SAI H3 +0.14 0.27 108 34 n/a 0.35 no no no DSP no 10 97 52 SAI H1 +0.19 0.19 96 28 n/a 0.29 no no no DSP no 11 96 53 SAI H6 +14.77 0.12 97 21 n/a 0.39 no no yes FS no 96 53 SAT H6 +15.33 0.1 97 20 n/a 0.21 no no yes FS no 12 93 54 SAT H8 -0.02 0.22 63 21 n/a 0.29 no 16.8v yes DSP no 13 80 55 DSI 1.68V 81D Hl+0.83 SAI H1 +0.91 0.74 116 51 n/a 0.57 no no no EC no test 14 98 55 SAI H6 +11.13 0.21 113 25 n/a 0.39 no no yes FS no 15 95 56 SAI H6 +0.83 0.17 108 26 n/a 0.34 no no yes FS yes DFI 0.81V 99D 16 16 57 HTS+0.58 SAI HTS +0.69 0.18 76 25 n/a 0.16 no no no HTS no 17 100 57 SAI H5 +0.08 0.24 105 30 n/a 0.37 no no yes DSP no DFI 0.67V 127D 18 18 59 HTS+1.26 SAI HTS +0.47 0.22 85 27 n/a 0.26 no no no HTS no 19 22 59 SAI HTS +0.85 0.2 81 26 n/a 0.19 no no no HTS no 20 23 60 SAT HTS +1.55 0.26 101 33 n/a 0.2 no no no HTS no 21 85 60 SAI H6 +0.76 0.31 98 34 n/a 0.5 no no yes FS marginal 85 60 SAI H6 -2.39 0.16 105 28 n/a 0.16 no no yes FS yes 22 95 60 SAI H4 +0.91 0.23 96 28 n/a 0.22 no 11.36v no FS no 95 60 SAI H6 +2.02 0.18 114 27 n/a 0.29 no no yes FS no

LIC-05-01 18 Attachment Page 16 Table 3

.Znrinor MM() (Bzifna, SIG RC-2B 2003 2005 Bobbin call P1 2005 MRPC Circ. Critical MRPC/

Row Line Call call Volts Deg % Deg Axial Layers Dent Area Sup Change DSI 0.63V 1 lOD 23 80 61 H1+0.24 SAIH1+0.22 0.16 110 30 n/a 0.22 no no no DSP yes 80 61 SAI HI -0.22 0.27 114 35 n/a 0.46 no no no DSP no 80 61 SAIH2-0.06 0.26 101 34 n/a 0.52 no no no DSP no 24 82 61 SAIH6+1.16 0.53 115 43 n/a 0.72 no 11.30v yes FS no 25 92 61 SAIH6+1.42 0.18 104 28 n/a 0.15 no no yes FS yes 92 61 SAIH7 +1.55 0.16 107 25 n/a 0.22 no no yes FS yes 26 96 61 SAIH5+33.77 0.14 83 25 n/a 0.24 no no yes FS no 27 101 62 SAIH5+13.23 0.19 101 29 n/a 0.31 no no yes FS yes DEI 3.58V 118DCTS-28 30 63 0.36 CVI CTS +0.04 0.2 108 27 240 0.29 no no no CTS no test 29 92 63 SAT H3 +0.07 0.24 104 32 n/a 0.24 no no no DSP yes 92 63 SAI H4 +0.81 0.43 120 44 n/a 0.4 no no no FS marginal 30 89 64 SAIH7+0.12 0.17 105 27 n/a 0.25 no no yes DSP yes 89 64 SAIH6+0.99 0.13 88 25 n/a 0.22 no no yes FS yes 31 78 65 SAIH4-0.09 0.14 101 24 n/a 0.19 no no no DSP no 32 98 65 SAT H6 +17.03 0.34 84 38 n/a 0.58 no no yes FS yes 33 15 66 SAL HTS +0.71 0.37 91 38 n/a 0.22 no no no HTS no DFI 1.lIV 131D no 15 66 HTS+0.88 SAI HTS +0.72 0.41 102 41 n/a 0.41 no no HTS no 34 19 66 SAI HTS +0.97 0.19 92 25 n/a 0.22 no no no HTS no 19 66 SAIMHTS+1.13 0.16 111 24 n/a 0.22 no no no HTS no 35 97 66 SAIMH6+21.42 0.18 109 27 n/a 0.47 no no yes FS no 36 18 67 SAI HTS +0.90 0.19 106 26 n/a 0.16 no no no HTS marginal DEI 5.94V 98D 37 31 68 CTS+O.I0 CVI CTS +0.15 0.3 82 32 214 0.25 no no no CTS no test 38 16 69 SAITHTS+0.83 0.21 56 29 n/a 0.16 no no no HTS no 39 18 69 SAT HTS +0.53 0.24 93 29 n/a 0.2 no no no HTS no

LIC-05-0118 Attachment Page 17 Table 3 Snring 2005 Outage _;,_ __.__ __ S/G RC-2B __ _

2003 2005 Bobbin call P1 2005 MRPC Circ. Critical MRPC/

Row Line Call call Volts Deg  % Deg Axial Layers Dent Area Sup Change 18 69 SAT HTS +0.72 0.15 99 24 n/a 0.2 no no no HTS no 40 94 69 SAT H8 +0.17 0.22 108 31 n/a 0.31 no no yes DSP yes 41 11 70 SAI HTS +0.48 0.23 102 29 n/a 0.23 no no no HTS no 42 41 70 SAI H5 +1.55 0.34 121 33 n/a 0.44 no no no FS yes 43 99 70 SAI H8 +2.05 0.19 117 27 n/a 0.32 no no yes FS yes 44 95 72 SAI H7 +14.45 0.15 91 26 n/a 0.46 no no ye FS no 45 11 74 SAI HTS +0.22 0.17 111 25 n/a 0.23 no no no HTS yes 46 77 74 SAI H4 +0.19 0.29 130 30 n/a 0.49 no no yes DSP no 47 76 75 SVI H7-0.33 0.38 80 12 55 0.43 no no yes EC no 48 33 78 SAI HTS +1.93 0.37 107 38 n/a 0.36 no no no HTS marginal DSI 2.41V 112D 49 62 81 H2+0.86 SAI H2 +0.82 1.08 99 59 n/a 0.42 no no no EC no test 50 62 89 DSI 1.58V 80D H1-0.89 SAI H1 -0.84 0.65 80 48 n/a 0.48 no no no EC no test 51 57 108 DSI 1.56V 68D H2+0.19 SAI H2 +0.22 0.62 91 47 n/a 0.39 no no no EC no test

LIC-05-01 18 Attachment Page 18 APPENDIX DEFINITIONS The acronyms defined below are used in Tables 1 through 3.

CVI: Circumferential Volumetric Indication DEL: Distorted Expansion Indication DFI: Differential Freespan Indication - An indication in the freespan that gives a flaw-like response on the bobbin coil (diagnostic/review required)

DSI: Distorted Support Indication (diagnostic/review required)

DSP: Drilled Support Plate EC: Egg Crate FS: Free Span INR: Indication not reportable (diagnostic/review required)

MAI: Multiple Axial Indication - Axial indications in the same plane (pluggable)

NDD: No detectable degradation (no further action required)

NSY: Noisy Tube SAL: Single Axial Indication - Axially oriented crack-like indication (pluggable)

SCI: Single Circumferential Indication - Circumferentially oriented crack-like indication (pluggable)

SVI: Single Volumetric Indication - Indication which represents that volumetric (non-oriented) degradation is present (pluggable)

TBP: To be plugged VOL: Volumetric - Indication which is volumetric in nature and generally associated with tube manufacturing (diagnostic/review required)

LIC-05-O 118 Attachment Page 19 FOR] P CALHOUN STEAM GENERATOR IELEVATION DRAWING HTE Hot leg Tube End HTS Hot Leg Tubesheet H1-H6 Hot Leg Full Supports H7 Hot Leg Partial Egg Crate H8 Hot Leg Partial Drilled Support DBH Diagonal Bar Hot Leg VI-V3 Vertical Supports DBC Diagonal Bar Cold Leg C8 Cold Leg Partial Drilled DBI Support C7 Cold Leg Partial Egg Crate C6-C1 Cold Leg Full Supports CTS Cold Leg Tubesheet CTE Cold leg Tube End H8 H7 H6 H6 H4 H3 H2

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