ML20083N870
| ML20083N870 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood  |
| Issue date: | 07/31/1994 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20071L473 | List: |
| References | |
| PROC-940731, NUDOCS 9505230357 | |
| Download: ML20083N870 (58) | |
Text
{{#Wiki_filter:-_ --- _ - - - r l l i I Commonwealth Edison Company Byron & Braidwood Stations ! Units 1 & 2 1 Eddy Current Analysis Guidelines
. ak-.
I 'I ! . / >
$1::
l
- .q . !
.mm e , I D
l - l l l . Rev.7 July 1994 1 9505230357 940801 l' DR ADOCK 050004 4
i y 1 2 Table of Contents , Section Ilila Enos Purpose 1 1.0 Scope 1 2.0 . 3.0 Responsibilities 1 4.0 Personnel Qualifications 2 5.0 General Analysis Requirements 2 6.0 Bobb!n Probe Analysis Requirements 3 Rotating Probe Analysis Requirements 11 7.0 8.0 Recording and Reporting Requirements 14 9.0 Re, olution Criteria 15 APPENDICES Appendix A Data Acquisition and Analysis Requirements for TSP ODSCC APC Appendix B Analysis Guidelines Change Forms Appendix C Analysis and Retest Codes Appendix D Support Structures Nomenclature and Measurements
a
- COMMONWEALTH EDISON Byron & Braidwood Unsts 1 & 2 Ar alyses Guidehnes Rev. 7 July 1994 1.0 PURPOSE eddy current vendor with CECO concurrence.
Responsibilities of these Analysts are as follows: 1.1 The purpose of this guideline is to provide g;neral instructions and to define specific 3.2.1 Senior Analvst r;quirements for the analysis of eddy current d:ta acquired from the Commonwaalth Edison a. Analyze eddy current data in accordance Company (CECO) Byron and Braidwood Units 1 with this guideline. & 2 steam generators.
- b. Identify and process required changes to 1.2 Analysis guidelines provide a structure to the guideline during the course of the ensure that data is (a) analyzed in accordance examination as circumstances may warrant.
with the appropriate techniques and practices Changes are documented using the Analysis that reflect current industry experience, (b) in a Guideline Change Form in Appendix B to this consistent and repeatable manner and (c) in guideline and are subject to CECO approval. compliance with CECO requirements.
- c. Promptly inthrm all data Analysts of 1.3 Conditions encountered during the course changes to this guidelbe as such changes occur.
of a steam generator examination not foreseen The Analysis Guideline Change by this guideline are to be reported by data Acknowledgment Form in Appendix B is used to cnalysts to the Lead or Senior Analyst . document receipt and review of changes by all Analysts. 2.0 SCOPE
- d. Perform duties of Lead Analyst or Analyst 2.1 This guideline provides instructions and as required.
define specif;c requirements for bobbin and rotating probe eddy current data analysis for the 3.2.2 Lead Analyst Byron and Braidwood Station steam generators.
- a. Analyze eddy current data in accordance 2.2 This guideline also provides direction in with this guideline.
cpplying analysis requirements for an outer diameter stress corrosion cracking at tube b. As a Resolution Analyst, resolve support plates Attemate Plugging Criterion discrepancies between primary and secondary (APC). Analysts and resolve LAR (Lead Analyst Resolution) calls in accordance with the 3.0 RESPONSIBILITIES resolution criteria in Section 9 of this guideline. 3.1 Commonwealth Edison is responsible for c. Promptly inform the Senior Analyst of interpreting, maintaining and implementing these circumstances that srise during the course of guidelines, and determining plant specifc APC data analysis that are not consistent with or not cddy current data analysis applicability. addressed by this guideline and may require changes. 3.2 The Senior Analyst, shift Lead Analysts, cnd data Analysts are selected by CECO or the 1
1 1 COMMONWEALTH EDISON Rev. 7 Juty 1994 Byron & Branswood Unrts 1 & 2 Analyses Guksehnes l 3.2.3 Analyst 5.3 Data analysis consists of reviewing l Lissajcus and strip chart displays to the extent I
- a. Analyze eddy current data in accordance that all indications of tube wall degradation and with this guideline. other signals as defined by this document are reported and dispositioned in accordance with
- b. For each calibration group of data the requirements of this document. I I
cnalyzed, prepare and submit a final report consistent with this guideline that is complete 5.3.1 All recorded data shall be evaluated end free of errors. regardless of the extent tested.
- c. As a Resolution Analyst, resolve 5.3.2 Phase angle measurements shall be discrencncies between primary and secondary made utilizing VOLTS MAXRATE for signals Ansiysts in accordance with the resolution which have a well-defined transition. For cases criteria in Section 9.0 of the guideline. where no clear transition exists, a VOLTS PEAK-TO-PEAK approach shall be used. The 4.0 PERSONNEL QUALIFICATIONS use of guess angle shall be kept to a minimum and only used when the latter two analysis 4.1 Personnel analyzing data shall be functions do not give a good representation of qualified in accordance with SNT-TC-1 A and the signal phase angle.
certified to Level llA or Level Ill. 5.3.3 Indications for which there are no 4.2 In addition, the analyst shall have applicable reporting criteria or which the Analyst received training in the evaluation of eddy considers to be ambiguous or indeterminate current data for nonferromagnetic tubing. should be reported as LAR. The Lead Analyst must resolve such indications with the 4.3 Data analysts will successfully pass a concurrence of the Senior Analyst. CECO eddy current data Analyst performance demonstration program consisting of site-specific 5.4 All acquired data shall be subject to two training and testing prior to analyzing production independent analyses. These are referred to as data. " primary" and " secondary" analyses. 5.0 GENERAL ANALYSIS REQUIREMENTS 5.4.1 The two individual analysis results shall be reviewed for discrepancies in 5.1 All recorded indications shall be accordance with Section 9.0 of this guideline. cvaluated in accordance with this guideline. Guideline changes must be implemented using 5.4.2 If no discrepancies exist between the the change form given in Appendix B. primary and secondary analyses, then the primary analysis results shall be considered as 5.2 There is no minimum voltage threshold for final. reporting indications believed to be attributable to tube wall degradation. 5.5 All previous history must be addressed. If no indication is identified at the previous reported location an INF or INR 2
I3 L J COMMONWEALTH EDISON syron a e,.m a unas i a 2 An v ouin.nn n v.7Jun sees enalysis code (See Appendix C) will be used. 5.10.3 Support structure (landmark) nomenclature and measurements are identified 5.6 Axial locations in the hot leg shall be in Appendix D of this guideline. rcported in a positive direction from supports, AVB's, tube sheet, and tube end up to but not 5.11 Calibration Verification including 011C. s 5.11.1 ASME Standard 5.7 Axial locations in the cold leg shall be reported in a positive direction from supports, s. Calibration verification shall be performed tube sheet, and tube end up to 011C. at the beginning and end of each calibration group. If the requirements are not met for bobbin ' 5.8 Probe speed (axial traverse speed and probe data then the data Analyst will identify the RPM as applicable) should be verified on the affected data and determine which tubes, if any, following occasions: require retest. 5.8.1 At each calibration run. b. The ASME calibrations shall be compared 1 within the following parameters using Channel 1: 5.8.2 At any time probe speed is questionable. (1) The phase angle of the 100% through-wall hole response should be at 40* +/- 5*. 5.9 Storing Analysis Setups : (2) The phase angle of the 20% drill hole ; 5.9.1 The analysis setup established for each response should be between 50* and 130* j calibration group shall be stored to the data clockwise from the 100% drill hole response. ; recording medium. (3) Responses from the calibration , 5.9.2 Each primary, secondary or resolution discontinuities should be clear!y indicated and Analyst shall store results to primary, secondary, discemible from each other and probe motion. l or resolution files respectively. 6.0 BOBBIN PROBE ANALYSIS 5.10 Reportina Criteria 6.1 Setuo and Calibration 5.10.1 The record of each tube analyzed shall , include the Tube ID; VOLTS, DEG, % or three 6.1.1 Examination Freauencies i letter code, CH# and axial location ; corresponding to any reported indication (s); and Examination frequencies and' channel I the extent tested. assignments are given in Table 6-1. 5.10.2 Acceptable three letter analysis codes for reported indications that are not assigned a percent through-wall are identified in Appendix C of this guideline. 3
r~m l j COMMONWEALTH EDISON Byron & Braufwood Uruts 1 & 2 Analyses Guidehnes Rev. 7 July 1994 reporting indications at support structures (other Table 6-1 than AVB's). Tube Examination Frequencies
- b. Mix 2: 300/130 KHz absolute; mix on Frequency Differential Absolute ASME support ring signal. Set amplitude (kHz) Channel Channel (voltage) .3-point calibration curve (VERTMAX) l 550 1 2 using the 0%, 20%, and 40% AVB wear scar signals. (Note: 50% wear scar may by substituted 300 3 4 if 40% wear scar does not exist in standard). Mix 130 5 6 2 is used for reporting indications at AVB's.
10 7 8
- c. Mix 3 (optional): 550/300/130 KHz 6.1.2 Settina Mixes differential; suppress ASME support plate and normal in-generator roll expansion signal; The mixes in Table 6-2 shall be established. save signals from ASME standard drill holes.
Mix 3 is used to screen TTS expansion regions Table 6-2 for indications and to aid in the confirmation of Mix Setup other indications. Mix Channel Suppress Save 6.1.3 Settina Rotations Sequence on: on: I
- a. Channels 1,3, and 5: Adjust the rotation Mix 1 15 Support N/A Ring so that the phase angle of the signal from the 100% through-wall hole is 40 degrees (+/- 2 Mix 2 4-6 Support N/A degree) with initial signal excursion down and I"U to the right as the probe is pulled through the Support ASME Cal calibration standard.
Mix 3 1-3 5 Ring + Std Drill (Optional) Clean TTS Holes & OD
- b. Channels 2,4, 6, and Mix 2: Adjust the rotation so that probe motion is horizontal with Additional mixes may be established for screening and diagnostic applications at the c. Channe; 6: As an option, the signal discretion of the analyst. However, as a response from the ASME 100% drill hole may be minimum, data screening and reporting shall be rotated to 32* (+/- 2').
conducted using the applicable channels specified in Section 6.2. d. Channels 7 and 8: Adjust the rotation so that the initial excursion of the signal from the
- a. Mix 1: 550/130 KHz differential support support ring is oriented vertically starting mix; mix on ASME standard support ring. Set downwards.
3-po,nti phase angle-depth calibration curve using ASME 100%, 60%, and 20% drill hole e. Mix 1 and Mix 3: Set probe motion signale. Mix #1 is the primary channel for horizontal with the signal from the 100% drill 4
i COMMONWEALTH EDISON J Byron & Bradwood Unds 1 & 2 Analysis Gudehnes Rev. 7 July 1994 hole starting downwards and to the right (signal 6.1.6 Calibration Curves will be at about 35 degrees).
- a. Calibration Standard Holo Depths:
6.1.4 Settina Scans (1) The actual depths corresponding to the
- a. Channel 1 and Mix 1: As a minimum, set nominal depths provided below shall be used in span so that the magnitude of the ASME 20% establishing calibration curves. "As built" hole drill hole response is approximately 25% of the dimensions shall be obtained from the applicable full screen height (FSH) of the Lissajous display. calibration standard drawings.
Verify that the magnitude of the ASME 100% drill hole response is at least 50% of FSH. (2) Normalized calibration curves generated using phase angles based on a nominal wall
- b. Mix 2: Set span so that the magnitude of thickness and a standard depth of penetration of the AVB 20% wear scar response is 37% are permitted if the requirements of Section approximately 25% of FSH. 6.1.6.a.1 cannot be satisfied.
- c. Locator Channels 7 and 8: Set span so b. Use of Artificial Curves: The use of that the magnitude of the support plate response artificial curves e.g., set 4.1, is prohibited.
on Channels 7 and 8 are at least 50% and 25% of FSH, respectively,
- c. Mix 1 and Channels 1,3, and 5: Establish 6.1.5 Settina Volts phase angle versus depth curves using the following nominal set points:
- a. Channel 1: Set the ASME 20% FBH signal to 4 volts +/- 0.1 volts peak-to-peak in Set Point 1: 100 %
Channel 1 and save/ store to all other channels Set Point 2: 60% and mixes. Set Point 3: 20 %
- b. Mix 1: If an ARC calibration standard is d. Mix 2: Establish a VERT MAX voltage used to establish a voltage scale, then the versus depth curve using either of the following , , ,
voltage shall be set to the normalized value on two cases of typical nominal set points, the applicable transfer standard drawing, depending on the AVB calibration standard used: Save/ store to Mix 1. If an ASME calibration standard is used, then set the 20% FBH signal to Case 1 Case 2 2.75 volts +/- 0.1 volts peak-to-peak in Mix 1. Set Po'.nt 1: 0% 0% Save/ store to Mix 1. Set Point 2: 20 % 30 % , Set Point 3: 40% 50%
- c. Mix 2: Set the 40% wear scar signal (or 50% wear scar signal if applicable) to 5 volts e. Mix 3 (Optional Turbo Mix): No :
(VERTMAX). Save/ store to Mix 2. calibration curve is required. 5
1 . - l L, r COMMONWEALTH EDISON ! symn a sr.o.ood une. i a 2 Anny ouwen n.v. 7 ausy see4 6.1.7 Data Display c. Axial locations of indications are measured with a positive offset and physically upward in
- a. As a minimum, set up the display relation to the adjacent landmark.
configuration for initial data screening according to Table 6-3 using the span settings established (1) Locations of indications within the in Section 6.1.4. boundaries of support and baffle plates are
. referenced (+) or (-) as they occur above or Table 6-3 below the support structure centerline.
Minimum Display Configuration Requirements (2) Indications within the expansion transition Display Channel region near the secondary tubesheet face are referenced relative to the top of the tubesheet. Lissajous CH1 Left Strip Chart CH 6 Vertical (3) U-bend indications are referenced (+) in Right Strip Chart Mix 1 Vertical relation to the adjacent AVB toward the hot-leg or upper hot-leg support plate as appropriate. l 6.1.8 Settina Scale and Axial Locations (4) AVB indications are referenced to (0.00) at the corresponding AVB.
- a. Set the axial scale to the nearest one-hundredth (0.00) of an inch using Appendix d. Location landmarks are identified using the C for dimensions and verify proper setting each appropriate three-letter codes as specified in time an indication is reported. Appendix C.
- b. Scale should be set using the two support 6.2 DATA EVALUATION structur63 which bound the region of interest. For U-Bend indications, set scale using the two 6.2.1 This section defines special augmented uppermost TSP's on either leg of the steam data screening and analysis requirements for generator, various classes of indications. Particular attention should focus on analysis procedures for (1) Use the TSP centerline as the zero 1) free-span indications, and dings. Both of these reference point when setting scale between types of indications have been associated with TS P's, recent industry forced outages in preheater steam generators.
(2) Use the top of the tubesheet and next TSP or baffle plate centerline when setting scale in addition, evaluation requirements for between the top of the tubesheet and the lowest screening support structures, e.g., support and TSP or baffle plate. baffle plates, AVB's, and the tubesheet secondary face, are described. (3) Use the tube end and top of tubesheet when the region of interest is within the tubesheet. 6
M9V
! ! COMMONWEALTH EDISON L_)
Byron & Breedwood Urves 1 & 2 Analyeas Guidehnes Rev. 7 July 1994
- a. Free-Span Sections (Byron 1 and 4. Single indications may be reported using a Eraidwood 1 Only): discrete location while multiple indications in close proximity may be reported using a to-from
- Ding Signal Screening location.
- 1. Free-span ding signals discovered during 5. Figure 6-1 shows a flowchart illustrating d".ta screening shall be scrolled in the Lissajous U-bend data screening and reporting window using Channels 1,3 and 5. requirements.
.~
- 2. Distorted. m-indications observed during data scros u-b nd rcview shall be reported as FSI for subsequent channY.
disposition by rotating probe diagnostics. . span to -
- 3. It should be noted that generally distorted indications are more apparent in Channels 3 and 5, and often are not evident in Channel 1 "\
because of the overwhelming horizontal response caused by local tube indentation or pm No deformation. Indicanon? a U-bend region Data Screenina (Data Analvsts) y,, , noo
- 1. The U-bend region between the uppermost support plates shall be scrolled in the Lissajous window using Channel 5 at a numerical span confrmed setting of 10 orless. using Channel No-37
- 2. Possible indications observed in Channel 5 should be confirmed using Channel 3. It is emphasized that definitive indications may not always be observedin either of the two channels. yes Rather, the indications may assume a noise-like structure, with multiple discrete indications ,
occurring in close proximity over a longer axial distance. Report as
- 3. Report all confirmed indications using an ( )
Free-Span Signal (FSS) analysis code. \ / Subsequent disposition of all reported indications Figure 6-1. will be accomplished by a resolution analyst. Data screening requirements for U-bend free-span indications. 7
m, COMMONWEALTH EDISON La! _ Byron & Braadwood Unds 1 & 2 Armlysm Guidehnes Rev. 7 July 1994 Discosition fResolution Analvsts) measurement points between the identifying frequency and the Mix 1 channel to obtain proper
- 1. Previous history or rotating probe ple. cement.
diagnostics shall be used to disposition U-bend frce-span signals. 3. The largest amplitude portion of the Lissajous signal (not necessarily the MAXRATE
- 2. U-bend free-span signals may be further position) representing the indication should then rcelassified as Free-Span Differeiual (FSD), be reported using Mix 1 to establish the voltage.
Manufacturing Burnish Mark (MBM) etc., d:pending on the relative response of the cbsolute/ differential bobbin coil modes. Scroll Tube support using
- 3. U-bend free-span signals identified for Channels 3 and rcpair shall be reclassified as a Free-Span Indication (FSI).
- b. Support Plates and Baffle Plates:
Conventional Pluaaina Criterion:
'"di
- 1. Scroll support plates using Channels 3 and or i rted No Mix 1. There is no minimum threshold voltage for Indication?
reporting.
- 2. Channel 3 is usually a very useful channel y for data screening and locating the initial position for phase angle measurement. Yes NDD l
- 3. Mix 1 shall be used to determine the final , y j phase angle measurement point. , ,
Alternate Pluacina Criterion: Report using Mix 1
- 1. Scroll support plates using Channels 3 and Mix 1. There is no minimum threshold voltage for reporting purposes.
- 2. Initial placement of the dots for identification of the flaw location may be performed using Channels 1 or 3, but the final Figure 6-2 peak-to-peak measurements must be performed Flowchart showing data screening for using the Mix 1 Lissajous signal to include the indications at tube support plates.
full flaw segment of the signal. It may be i necessary to iterate the positions of the ! 8 l l
,r-- m ! COMMONWEALTH EDISON t_o _
Rev. 7 July 1994 Byron & Bresdwood Unas 1 & 2 Analyese Guidehnee
- c. Antivibration Bars:
- 1. Scroll antivibration bars locations using Mix 1 or Mix 2.
Scroll
- 2. Report indications using the Mix 2 Antivibration Bar using VERTMAX analysis function. Signal amplitude, Mix 1 r Mix 2 ts measured on the conservative leg of the indication, shall be utilized for sizing indications et AVB's.
- 3. Figure 6-3 shows a flowchart illustrating data screening and reporting requirements.
Possible O Indication? u Yes NDO l v ( Reportusing Mix 2 Figure 6-3 Flowchart showing data screening for indications at AVB's. l 9
(, ' l COMMONWEALTH EDISON l t : Byron & Braiowood Unds 1 & 2 Atwyess Gm Rev.7 Juy 1994
- d. Tubesheet Secondary Face:
- 1. Scroll all tubesheet secondary face cxpansion transitions using Channels 1, 3, 5, and Mix 1 at span settings such that the expansion signal (except for Mix 1) occupies the Scroll Tubesheet maximum extent of the Lissajous display without Secondary Face saturating. chann ,3 & 5,
~
& Mix 1
- 2. As an 6hbn, Mix 3 (Turbo mix) may be Mix 3 (opoonan used to carefully screen for degradation-like indications at the top of the tubesheet.
n
- 3. Distorted tube sheet entry signals or possible indications should be reported using the Distorted appropriate analysis code. Tu heet
,, No Indication?
- 4. Figure 6-4 shows a flowchart illustrating data screening and reporting requirements, u
Yes NDD v Report Using Apropriate Analysis Code Figure 6-4 Flowchart showing data screening for indications at tubesheet secondary face. 10
1 COMMONWEALTH EDISON , L J Rev. 7 July 1994 Byron & Bresswood UvWto i & 2 Analyses Guidshnes 7.0 ROTATING PROBE ANALYSIS 7.1.3 Filters (Octional) : 7.1 Setun and Calibration a. At the option of the data analysts or at the direction of the Lead Analyst, bandpass filters on 7.1.1 Examination Frequencies process channels P1, P2 and P3 using Channels ; 1,2 and 3 (300 KHz), respectively, may be ,
- s. Examination frequencies and channel established using the nominal settings of Table 'l Essignments for a three-coil rotating probe are 7-2. Settings may be adjusted slightly to improve given in Table 7-1. signal-to-noise.
Table 7-1 Three-Coil Rotating Probe Table 7-2 Bandpass Filter Setup Channel Frequency Coil Coil Function (km Type Parameter Value 1 300 1 Pancake l Sharpness on 23 coefficients _ , Low cutoff 10 Hz 2 300 5 Circ Axial Wound Detection frequency 3 300 7 Axial Circumferential High cutoff 100 Hz Wound Detection frequency 4 200 1 Pancake General Confirmation 5 200 5 Circ Axial 7.1.4 Settina Volts Wound Confirmation 6 200 7 Axial Circumferential Wound Confirmation Pancake Coil
- a. Set the voltage for Channel 1 to 20.00 +/-
j Co Nton 0.3 volts on the largest peak-to-peak response of 8 100 4 Pancake Trl00er the 100% EDM notch.. 9 100 5 Circ Axial Wound Confirmation
- b. Normalize the voltage for other pancake '
10 100 7 Axial Circumferential Wound Confirmation coil channels (CH4 and CH7) in reference to 11 10 1 Pancake Locator Channel 1. Store to all other channels for that coil. 7.1.2 Settina Mixes (Octional) Circumferential Wound Coil
- a. At the option of the data analysts or at the a. Set the voltage for Channel 2 to 20.00 +/-
direction of the Lead Analyst, mixes may be 0.3 volts on the largest peak-to-peak response of established for information only. the 100% EDM notch. / 11
lR L . COMMONWEALTH EDISON Byron & Bradwood Uruts 1 & 2 Analyus Gu6dehnee Rev. 7 July 1994
- b. Normalize the voltage for all other pancake c. Channel 11: Set the response of the coil channels (CHS and CH 9) in reference to support plate vertically downward at Channel 2. Store to all other channels for that approximately 270*.
coil. l 7.1.7 Settina Curves l Axial Wound Coil I
- a. Depth calibration curves are not required.
- a. Set the voltage for Channel 3 to 20.00 +/- Phase angle or amplitude curves may be 0.3 volts on the largest peak-to-peak response of established at the Analysts' option for information the 100% EDM notch. only.
- b. Normalize the voltage for all other pancake 7.1.8 Setting Scale and Axial Locations coil channels (CH6 and CH10) in reference to Channel 3. Store to all other channels for that a. Using Channel 1, set scale between the coil. centerlines of two known reference locations of greatest separation on the EDM notch standard. !
7.1.5 Setting Scans
- b. Verify proper scale setting when reporting
- a. Channels 1,2,4,5,8 & 9: Set spans such each indication.
that the peak-to-peak response of the axially oriented 40% EDM notch is at least 25% FSH. c. For support plate indications, axial locations should be referenced positively (+)
- b. Channels 3,6 & 10: Set spans to same upward or negatively (-) downward from the nominal numerical values as Channels 2,5, and 9 centerline (0.00) of the nearest support plate.
respectively.
- d. For top of tubesheet indications, axial
- c. Channel 8: Set span so that the trigger locations should be referenced positively (+)
pulse occupies approximately 50% FSH. upward or negatively downward from the top of the tubesheet zero (0.00) reference.
- d. Channel 11: Set span so that the support plate occupies 25%-50% FSH. 7.1.9 Disolav Conflouration ;
7.1.6 SettinnRotations a. Setup the display configuration for initial data screening according to Table 7-3 using
- a. Detection / Confirmation Channels: Set span settings established above. j probe motion to within +/- 5* of horizontal with l flaw excursions directed upwards. 7.1.10 C-Scan
- b. Channel 8: Set the trigger pulse vertically a. C-scan features shall be adjusted upwards at 90*-120*. consistent with the software suppliers recommended practice.
12 1
i COMMONWEALTH EDISON Rev. 7 July 1994 Byron & Braidwood Unas 1 & 2 Analysas Guidehnes irrespective of the extent to which the channels Table 7-3 correlate. Display Configuration 7.2.2 Analysis l Display Channel
- a. Graphic displays and relative three-coil -
Lissajous CH 1 (300 kHz) amplitude response shall be used to determine Left Chart CH 1 or CH P1 flaw orientation and dimensionality using the
* "*I basic logic summarized in Figure 7- 1.
Right Chart CH 2 or CH 3 Vertical ,, R Ampmus. 7.1.11 Indication Lenath Measurements
- a. Indication length measurements are required,
- b. Software features for measuring indication 1:ngths will be invoked consistent with the software supplier's recommended practice, g[,, :=
e
*" =
i c. Setup of measurement features should be C "' done using the nominal tube ID and the as-built " dimensions of the EDM notch standard agy;ao discontinuities. .g va e 7.2 Data Evaluation
"?::
7.2.1 Screenina
- a. Review strip chan data while scrolling all acquired data using Channel 1 to establish the presence of an indication. Other analysis channels may be used for additional Figure 7-1.
confirmation. Rotating Probe Analysis
- b. Decrease initial span settings (higher gain) ,
as required such that proper detailed analysis is b. Three-coil relative signal response as l conducted on all data. shown in Table 7-4 may be used to assist in determining flaw dimensionality and orientation.
- c. Indications which are flaw-like on any of the degradation channels shall be reported 13
1 c
;L- COMMONWEALTH EDISON Byron & Brasowood Unds 1 & 2 Analyess Guldehnes Rev. 7 Juy 1994 l Table 7-4 a. All quantifiable indications of tube wall i Three-coil Relative Amplitude Response degradation shall be reported. For AVB l indications, the reporting threshold is 15%. l Flaw Dimensionality / Orientation Coil' Vol Axial Circ b. All non-quantifiable indications (See Appendix B, Category 11) shall be reported. As Pancake + + +
a general rule, Category ll Indications shall be Axial + + - considered a repairable condition unless proven Cire + - + otherwise using supplemental diagnostic i L techniques, e.g. RPC or equivalent, or historical Three-dimensional discontinuities in general review. j will have a comparable response from the Linear or
- c. Dents or dings > 5 volts peak-to-peak (M.ix pancake and axial /cire coils.
two-dimensional discontinuities will typically 1)- 4 show a preferred response to either the axial or
- d. Distorted dents or dings having flaw-like cire coils (or both) dependent on flaw orientation, characteristics shall be reported as LAR.
The pancake coil is equally sensitive to linear discontinuities independent of their orientation. e. Actual test extent shall be reported as the furthest landmark from the entry leg observed.
- c. Indications with a preferred amplitude response from either the axial or circ coil shall be 8.1.2 Recordina Reauirements analyzed using a three-letter analysis code indicative of the orientation (axial or a. As a minimum, the following graphic circumferential) and frequency of occurrence in a Printouts shall be generated for each reported given plane. Indications with comparable quantifiable indication, "I" code indication, amplitude responses from all three coils shall be Free-Span Signal (FSS) and LAR indication:
analyzed as three-dimensional (volumetric) using an appropriate analysis code. Section 8.2 1. Multiple-channel Lissajous graphics as defines the applicable analysis codes. specified in Tables 8-1 or Table 8-2.
- e. Locations with both axial and b. The following information 'will be circumferential indications present concurrently recorded in the FINAL REPORT section of the shall be analyzed as mixed-mode. RECORDING MEDIUM:
8.0 REPORTING AND RECORDING 1. For each tube evaluated, an entry must be REQUIREMENTS made that, as a minimum, contains the S/G, ROW, COL, and EXTENT tested. ! 8.1 Bobbin Probe l 2. The evaluation of all indications to 8.1.1 Reportina Reauirements include the S/G, ROW, COL, VOLTS, DEG, %, CH#, LOCATION, and EXTENT tested. i i 14
. i
. m COMMONWEALTH EDISON syron a Brouswood Uruts 1 & 2 Armlysse Guidehnee Rev 7 July 1994
. 3. Any RESTRICTED tubes and the location 8.2 Rotating Probe
.where' probe passage is obstructed. Restricted locations must include elevation where 8.2.1 Reporting Reauirements r:striction occurs.
- a. The voltage of an Indication will be. j
- c. The
SUMMARY
portion of the measured at the peak signal for each indication. 1 RECORDING MEDIUM shallinclude: This will generally be at the centermost " hit" of the indication using the detection channel (CH 1
- 1. All information recorded on the typically). Peak-to-peak voltage should be used RECORDING MEDIUM and updated to reflect for the voltage reading, adjusting the window the actual spans and rotations used during data width to minimize noise in the signal. .
svaluation.
- b. Indication location will be derived from the
- 2. The NAME(S) and LEVEL (S) of the centermost " hit" point of the calling channel, evaluator (s) along with the date of the evaluation. c. Indications will not be reported as a ;
percent depth, but assigned an analysis code indicative of the dimensionality, orientation and Table 8-1 frequency of occurrence of the flaw in a given , Eight-Channel Graphics plane. Permissible analysis codes are listed in : Appendix D. l Location Lissajous ~ Charts Supports 1,3,5, Mix 1 Mu: 1 8.2.2 Recordina Reauirements 2,4,6, Mix 2 AVB's 1,3,5, Mix 1, Mix 2 The following graphic printouts should be 2,4,6, Mix 2 generated for each reported indication: Free Span 1,3,5, 1 5
- a. Main display screen typically with the l Lissajous of the calling channel (CH 1), left strip US 13 1 Mix 1 chart of a low frequency channel adequate to p' ' 0, Mix 3 display the bounding or nearest support and right
- strip chart with the vertical component of a confirmatory channel (e.g., CH P1 or CH 2). ,
Table B-2 ) Four-Channel Graphics b. C-scan of indication with the low frequency channel displayed on the strip chart and either Location Lissajous Charts the calling channel or corresponding filtered Supports 1,3,5, Mix 1 6, Mix 1 channel for the C-scan plot. AVB's 1,3,6, Mix 2 6 Mix 2 l Free Span 1,3,5,6 1, 5 9.0 RESNG GNM TTS 1,3,5, Mix 1 5, Mix 1 9.1 Primary and secondary analyses results will be compared and referred to the Senior , 15
p- . - L ..J COMMONWEALTH EDISON Byron & Broadwood Urvts 1 & 2 Analyess Guidehnes Rev. 7 July 1994 end/or Lead analysts for resolution and probe type, extent tested, analysis code disposition. assignment, etc.
]
9.2 Conditions requiring resolution include: 9.2.7 One analyst reports a tube not reported by another, 9.2.1 All quantifiable indications > 40% - through-wall, and Category 2 indications listed in 9.3 Any tube with an initially reported Appendix C where primary and secondary repairable condition - by either the primary or tnalysis results do not match. secondary analyst, or both - that is subsequently resolved to a non-repairable condWon during 9.2.2 Quantifiable indications between 20% resolution - shall be reported to a CECO cnd 39% reported by one Analyst but not the representative for information. other, 9.2.3 Indications in which the depth estimate differs by more than 10% through-wall 9.2.4 Indications for which location measurements differ by more than;
- a. +/- 1" for free-span,
- b. +/- 0.5" at support structures.
9.2.5 Indications at tube support plates for plants implementing APC for which;
- a. Bobbin coil indications are greater than the repair limit voltage where primary and secondary analysis results do not match.
- b. The reported location extends beyond cither support plate edge,
- c. Indications are diagnosed as circumferential cracking. by RPC.
- d. The bobbin coil voltage values called by primary and secondary analysts deviate by more than 20% and one or both calls exceeds 1 volt.
9.2.6 Reporting errors or discrepancies in such items as steam generator, tube or reel ID, 16 l 1
l
)
1 1 I
~
)
i APPENDIX A NDE DATA ACQUISITION AND ANALYSIS ! GUIDELINES FOR ODSCC AT TSP APC l I
- )
i 1 l
j COMMONWEALTH EDISON t-Byron & Braxfwood Unsts 1 & 2 Analysas Guidehnes . Apperox A Rev.7 Jut /1994 A.1 INTRODUCTION A.2.2 Probes This appendix documents techniques for the A.2.2.1 Bobbin Coll Probes inspection of Byron and Braidwood Unit 1 steam generator tubes related to the identification of To maximize consistency with laboratory APC ODSCC or IGA / SCC at tube support plate (TSP) data, differentiM probes with the following regions. parameters shat! be used for examination of APC tube support plate intersections: This appendix contains guidelines which provide direction in applying the ODSCC - 0.610 outer diameter alternate plugging criteria (APC) described in this report. The procedures for eddy current testing - two bobbin coils, each 60 mils long, with 60 using bobbin coil (BC) and rotating pancake coil mils between coils (coil centers separated by 120 (RPC) techniques are summarized. The mils) procedures given apply to the bobbin coil inspection, except as explicitly noted for RPC in addition, the probe design must inspection. The methods and techniques detailed incorporate centering features that provide for in this appendix are requisite for implementation minimum probe wobble and offset; the centering' of TSP APC. features must maintain constant probe center to tube ID offset for nominal diameter tubing. For The following sections define specific locations which must be inspected with smaller acquisition and analysis parameters and than nominal diameter probes, it is essential that methods to be used for the inspection of steam the reduced diameter probe be calibrated to the generator tubing. reference normalization (Section A.2.6.1 and A.2.6.2) and that the centering features permit A.2 DATA ACQUISITION . constant probe center to tube ID offset. Byron and Braidwood Unit 1 steam A.2.2.2 Rotatina Pancake Coll Probes generators utilize 3/4" OD x 0.043" wall, Alloy 600 milli-annealed tubing. The carbon steel Pancake coil designs (vertical dipole moment) support plates and baffle plates are designed with a coil diameter d, where d is 0.060" s d 5 ; with drilled holes. The following guidelines are 0.125", shall be used. While other multi-coil (i.e., specified for non-destructive examination of the 1,2 or 3-coil) probes can be utilized, it is 1 tubes within the TSP at Byron Unit 1. recommended that if a 3-coil probe is used, any 1 voltage measurements should be made with the A.2.1 Instrumentation probe's pancake coil rather than its circumferential or axial coil. ) Eddy current equipment used shall be the Zetec MlZ-18, the Echoram ERDAU or other The maximum probe pulling speed shall be equipment with similar specifications. 0.2 in./sec for the 1-coil or 3-coil probe, or 0.4 in/sec. for the 2-coil probe. The maximum rotation shall be 300 rpm. This would result in a l pitch of 40 mils for the 3-coil probe. l l A-1
.. . - ~ . . . . - -. . . .. -
m ' COMMONWEALTH EDISON L- a
~
Byron & Braidwood Urvis 1 & 2 Analyes Guidehnes Appendet A Rev.7 July 1994 A.2.3 Calibration Standarda
- Probe Wear Standard A.2.3.1 Bobbin Coil Standards
- A probe wear standard for monitoring the The bobbin coil ca!ibration standards contain degradation of probe centering devices leading the followingitems: to off-center coil. positioning and potential variations in flaw amplitude responses. This
- Voltage Normalization Standard standard shall include four 0.052" +/- 0.001 inch diameter through-wall holes, spaced 90 degrees
- One 0.052" diameter 100% through wall apart around the tube circumference with an hole axial spacing such that signals can be clearly ,
distinguished from one another. See Figure A-1.
- Four 0.028" diameter through wall holes, 90 d:grees apart in a single plane around the tube circumference; the hole diameter tolerance shall ba +/- 0.001" (optional). 1 km i
- One 0.109" diameter flat bottom hole, 60%
through from OD
.bG@P NP
- One 0.187" diameter flat bottom hole, 40%
k 7 i j through from the OD j (g l i e 1
- Four 0.187" diameter flat bottom holes, 20% . . si o I D#"""" "
through from the OD, spaced 90 apart in a single l piane amund the tube circumference. The . [ tolerance on hole diameter and depth shall be 6 f;
+/ 0.001". i j ffU i"
- A simulated support ring, 0.75" long, . 4 "*" -(%"" %""'
comprised of SA-285 Grade C carbon steel or equivalent. All holes shall be machined using a mechanical drilling technique. This calibration A.2.3.2 Rotatina Probe Standard standard will need to be calibrated against the reference standard used for the APC laboratory A satisfactory RPC standard may contain: work by direct testing or through the use of a ! transfer standard. - Two axial EDM notches, located at the same axial position but 180 degrees apart circumferential, each 0.006" wide and 0.5" long, ( one 80% and one 100% through wall from the i ' O D. A-2 l l
.~ .. . -. .~..------ - . . - - - - - - - . _ - - - - - - . - . .
r~ COMMONWEALTH EDISON t Byron 4 Bradwood Uruts 1 & 2 Anahms Guedehnes. Appenem A Rev.7 July 1994 replaced. If any of the last probe wear standard
- Two axial EDM notches, located at the same signal amplitudes prior to probe replacement ,
exial position but 180 degrees apart exceeds the 15% limit, say by a variable value, circumferentially, each 0.006" wide and 0.5" x%, then indications measured since the last long, one 60% and one 40% through-wall from acceptable probe wear measurement that are the OD. within x% of the repair limit must be re-inspected with the new probe.
- Two circumferential EDM notches, one 50%
through wall' from the . OD with a 75 degree A.2.4.1 Bobbin Coil Wear Standard (0.57") are length, and one 100% through well Placement with a 26 degree (0.20") art length, with both notches 0.006" wide. Under ideal circumstances, the incorporation of a wear standard in line with the conduit and
- A simulated support segment 270 degrees guide tube configuration would provide in circumferential extent, 0.75" thick, comprised continuous monitoring of the behavior of bobbin ,
of SA-285 Grade C carbon steel or equivalent. probe wear. However, the curvature of the channelhead places restrictions on the length on Similar configurations which satisfy the intent in line tubing inserts which can be of calibrating RPC probes for OD axial and accommodated. The spacing of the ASME circumferential cracking are satisfactory. The Section XI holes and the wear standard results in canter to center distance between the support a length of tubing which cannot be freely plate simulation and the nearest slot shall be at positioned within the restricted space available, least 1.25". The center to center distance The flexible conduit sections inside the between the EDM notches shall be at least 1.0". channelhead, together with the guide tube, limit The tolerance for the widths and depths of the the space available for additional in line notches shall be 0.001". The tolerance for the components. Voltage responses for the wear slot lengths shall be 0.010". standard are sensitive to bending of the leads, and mock up tests have shown sensitivity to the , A.2.4 Anolication of Bobbin Coil Wear robot end effector position in the tubesheet, even ' Standard when the wear standard is placed on the bottom of the channelhead. Wear standard A calibration standard has been designed to measurements must permit some optimization of monitor bobbin coil probe wear. During steam positions for the measurement and this should be gsnerator examination, the bobbin probe is a periodic measurement for inspection efficiency. inserted into the wear monitoring standard; the The pre-existing requirement to check calibration initial (new probe) amplitude response from each using the ASME tubing standard is satisfied by of the four holes is determined and compared on periodic probing at the beginning and end of an individual basis with subsequent each probe's use as well as at four hour measurements. Signal amplitudes or voltages intervals. This frequency is adequate for wear from the individual holes - compared with their standard purposes as well. Evaluating the probe ; initial amplitudes - must remain within 15% of wear under uncontrollable circumstances would I their initial amplitude (i.e., {(wom-new)/new} for present variability in response due to l an acceptable probe wear condition. If this channelhead orientations rather than changes in i
- condition is not satisfied, then the probe must be the probe itself.
A-3 _ _ _ _ . , . _ _ ~ _ _ _
COMMONWEALTH EDISON L a Byron & Brenewood Uruts 1 & 2 Analyese Gussehnes . Appendo: A Rev.7 Juy1994 , A.2.5 Acouisition Parameters such as spans, rotations, mixes, voltage scales, and calibration curves. Although indicated depth ; The following parameters apply to bobbin coil measurement may not be required to support an data acquisition and should be incorporated in alternative repair limit, the methodology for 3 the applicable inspection procedures to establishing the calibration curves is presented.
) supplement (not necessarily replace) the The use of these curves is recommended for parameters normally used, consistency in reporting and to provide compatibility of results with subsequent A.2.5.1 TepMrenuancies inspections of the same steam generator and for comparison with other steam generators and/or This technique requires the use of bobbin coil plants.
550 kHz and 130 kHz test frequencies in the differential mode. It is recommended that the A.2.6.1 Bobbin Coli 550 kHg pHferential absolute mode also be used, at test frequencies Channel ' , of 130 kHz and 10 - 35 kHz.'The low frequency (10-35 kHz) channel should be recorded to Soans and Rotations: Spans and rotations provide a means of verifying tube support plate can be set at the discretion of the user and/or in edge detectien for flaw location purposes. The accordance with applicable procedures. 550/130 kHz mix or the 550 kHz differential channel is used to access changes in signal Voltaae Scale: The peak-to-peak signal amplitude for the probe wear standard as well as amplitude of the signal from the four 20% for flaw detection. through-wall holes should be set to produce a i voltage equivalent to that obtained from the APC RPC frequencies should include channels lab standard. The laboratory standarri adequate for detection of OD degradation in the normalization voltages are 4.0 volts at 550 kHz l 4 range of 100 kHz to 550 kHz, as well as a low and 2.75 volts for the 550/130 kHz mix. I frequency channel to support location of the TSP
- edges. The transfer / field standard will be calibrated against the laboratory standard using a reference A.2.5.2 Digitizina Rate laboratory probe to establish voltages for the field standard that are equivalent to the above A minimum digitizing rate of 30 samples per laboratory standard. These equivalent voltages inch should be used. Combinations of probe are then set on the field standard to establish
- speeds and instrument sample rates should be calibration voltages for any other standard.
chosen such that: Voltage normalization to the standard 1 calibration voltages at 550 kHz is the preferred Samole Rate (samples /sec1 2 30 (samples /in.) l Probe Speed (in/sec) normalization to minimize analyst sensitivity in establishing the mix. However, if the bobbin A.2.6 Analysis Parameters probes used result in a 550/130 kHz mix to 550 kHz voltage ratios differing from the laboratory This section discusses 1) the methodology for standard ratio of 0.69 by more than 5% (0.66 to establishing bobbin coil data analysis variables 0.72), the 550/130 kHz mix calibration voltage should be used for voltage normalization. A-4
! COMMONWEALTH EDISON L >
Bron & Bra Units 1 & 2 Analysis Guidehnes Appenda A Rev. 7 July 1994 indications of interest within the support plate Calibration Curve: Establish a phase versus signal. The largest amplitude portion of the d::pth calibration curve using measured signal Lissajous signal representing the flaw should phase angles in combination with the "as-built" then be measured using the 550/130 kHz Mix 1 flaw depths for the 100%,60%, and 20% holes. channel to establish the peak-to-peak voltage as shown in Eigure A-2. Initial placement of the dots A.2.6.2 Bobbin Coll 550/130 kHz for identification of the flaw location may be Differential Mix Channel performed as shown in Figures A-3 and A-4, but the final peak-to-peak measurements must be Scans and Rotations: Spans and rotations performed on the Mix 1 Lissajous signal to can be set at the discretion of the user and/or in include the full flaw segment of the signal. It may accordance with applicable procedures, be necessary to iterate the positions of the dots between the identifying frequency and the Voltaae scale: See Section A.2.6.1 550/130 kHz mix to obtain proper placement. As can be seen in Figure A-4, failure to do so can Calibration Curve: Mix 1 is a 550/130 kHz reduce the voltage measurement of Mix 1 by as , differential support mix; mix on ASME standard much as 65% to 70% due to the interference of support ring. Set 3-point phase angle-depth the support plate signal in the raw frequencies. calibration curve using ASME 100%, 60%, and The voltage as measured from Mix 1 is then 20% drill hole signals. Mix 1 is the primary entered as the analysis of record for comparison channel for reporting indications at support with the repair limit voltage. structures. ! To support the uncertainty allowances A.2.6.2 Rotatina Pancake Coil Channel maintained in the APC, the difference in amplitude measurements for each indication will Voltace Scale: The RPC amplitude will be be limited to 20%. If the voltage values called by referenced to 20 volts for a 0.5 inch long 100% the independent analysts deviate by more than through wall notch at 300 kHz. Each channel 20% and one or both of the calls exceeds 1.0 shall be set individually to the desired amplitude volts, analysis by the resolution analyst will be for the EDM notches on the plant standards; Performed. These triplicate analyses result in cross calibration will be achieved by comparison assurance that the voltage reported departs from , , of the RPC responses from the 100% drilled the correct call by no more than 20%. hole. A.2.8 Reoortina Guidelines A.2.7 Analysis Methodoloav The reporting requirements identified below, I Bobbin coil indications at support plates are in addition to any other reporting attributable to ODSCC are quantified using the requirements specified by the user. Mix 1 (550 kHz/130 kHz) data channel. This is illustrated with the example shown in Figure A-2. A.2.8.1 Minimum Reauirements The 500/130 kHz mix channel or other channels appropnate for flaw detection (550 kHz,300 kHz, All bobbin coil flaw indications in the 550/130 or 130 kHz) may be used to locate the kHz mix channel at the tube support plate A-5
rm ' COMMONWEALTH EDISON j i- _J e .._ syren a stesswood Urute i s 2 Analveis oundehnes Appendec A Rev.7 July 1994 ) intersections regardless of the peak-to-peak A.3 DATA EVALUATION signal amplitude must be reported. All TSP locations with indications exceeding 1.0 volts A.3.1 Upe of 550/130 Differential Mix for Extract lng the Bobbin Flaw Signal must be examined with RPC probes. i A.2.8.2 h In order to identify a discontinuity in the composite signal as an indication of a flaw in the j For each reported indication, the following tube wall, a simple signal processing procedure information should also be recorded: of mixing the data from the two test frequencies is used which reduces the interference from the Tube identification (row, column) support plate signal by approximately one order Signalamplitude (volts) of magnitude. The test frequencies most often
. Signal phase angle (degrees) used for this signal processing are 550 kHz and .
! Indicated depth (%)* 130 kHz for 43 mil wall Alloy 600 tubing. Any of l Test Channel (ch#) the differential datc channels including the mix Axial position of tube (location) channel may be used for flaw detection (though Extent of test (extent) the 130 kHz is often subject to the influence from many different effects), but the final evaluation of
- It is recommended that a percent through-wall signal detection, amplitude and phase angle will bn reported rather than a three-letter analysis code. be made from the 550/130 kHz differential mix While this measurement is not required, this channel. Upon detection of a flaw signal in the information might be found useful at a later date, differential mix channel, confirmation from other raw channels in not required; all such signals RPC reporting requirements should . include must be reported as indications of possible as a rninimum: type of degradation (axial, ODSCC. The voltage scale for the 550/130 kHz circumferential or other), maximum voltage' differential channel should be normalized as phase angle, crack lengths, and location of the described in Section A.2.2.6.1 and A.2.2.6.2.
conter of the crack within the TSP. The crack axial center to edge need not coincide with the The present evaluation procedure requires position of maximum amplitude. Locations which that there is no minimum voltage for flaw do not exhibit flaw-like indications in the RPC detection purposes and that all flaw signals, isometric plots may continue in service, except however small, be identified. The intersections that all intersections exhibiting flaw-like bobbin w th flaw signals t 1.0 volt will be inspected.with bahavior and bobbin amplitudes in excess of the RPC, unless the tube is to be plugged or repair limit voltage must be repaired, sleeved. Although the signal voltage is not a . notwithstanding the RPC analyses. RPC measure of flaw depth, it is an indicator of the ; isometrics should be interpreted by the analyst t tube burst pressure when the flaw is identified as characterize the signals observed; only axial ODSCC with or without minor 1GA. featureless isometrics are to be reported as NDD. Signals not interpreted as flaws include A.3.2 Amplitude Variabilltv dents, liftoff, depos,its, copper, magnetite, etc. It has been observed that voltage measurements taken from the same data by A-6 l
d sMq h, COMMONWEALTH EDISON Byron & Bresswood Uruts 1 & 2 Anahuse Guldehnes. Appendoc A Rev. 7 July 1994 different analysts may vary, even when using In some cases, it will be found that little if any l id:ntical analysis guidelines. This is largely due definitive help is available from the use of the to differences in analyst interpretation of where raw frequencies. Such as example is shown in to place the dots on the lissajous figure for the Figure A-11, where there are no significantly prak-to-peak amplitude measurement. Figures sharp transitions in any of the raw frequencies. A-5 and A-6 show the correct placement of the Consequently, the placement of the J dots on the Mix 1 Lissajous figures for the measurement dots must be made completely on ' prak-to-peak voltage amplitude measurements the basis of the Mix 1 channel Lissajous figure as for two tubes .jr,pm Plant S. In Figure A-5, the shown in the upper left of the graphic. An even llicement is dolte obvious. In Figure A-6, the more difficult example is shown in Figure A-12. placement requires slightly more of a judgment The logic behind the placement of the dots in Mix call. Figures A-7 and A-8 show these same two 1 is that sharp transitions in the residual support tubes with peak-to-peak measurements being plate signals can be observed at the locations of made, but in both cases the dots have been both dots. In the following graphic, Figure A-13, < pieced at locations where the normal max-rate somewhat the same logic could be applied in I dots would be located. The reduction in the determining the flaw-like portion of the signal I . voltage amplitude measurement is 19.3% in from the Mix 1 Lissajous pattern. However, Figure A-7 and 16.3% in Figure A-8. While this is inasmuch as there is no sharp, clearly defined an accepted method of analysis for phase-angle transition, coupled with the fact that the entry measurements, it is not appropriate for the lobe into the support plate is distorted on all of voltage amplitude measurements required. the raw frequencies, the dots should be placed as shown in Figure A-14. This is a conservative In Figures A-5 and A-6, the locations of the approach and should be taken whenever a dots for the peak-to-peak measurements being degree of doubt as to the dot placement exists. parformed from Mix 1 show the corresponding dots on the 550 kHz raw frequencies as also It is noted that by employing these being located at the peak or maximum points of techniques, identification of flaws is improved the flaw portion of the Lissajous figure. In a.q and that conservative amplitude measurements c_ gig should the should the dots to measure the are promoted. The Mix 1 traces which result from , voltage amplitude be at locations less that the this approach confirm to the model of TSP maximum points of the flaw portion of the 550 ODSCC which represents the degradation as a kHz raw frequency. series of microcrack segments axially integrated by the bobbin coil; i.e., short segments of Figure A-9 is an example of where the dots changing phase angle direction represent have been placed on the transition region of the changes in average depth with changing axial 550 kHz raw frequency data Lissajous figure. lt is position. This procedure may not yield the clear from the Mix 1 Lissajous figure that this maximum bobbin depth call. If maximum depth is i does not correspond to the maximum voltage desired for information purposes, shorted measurement. The correct placement on the Mix segments of the overall crack may have to be 1 Lissajous figure us shown in Figure A-10. This evaluated to obtain the maximum depth estimate.
- placement also corresponds to the maximum However, the peak to peak voltages as described voltage measurement on the 550 kHz raw herein must be reported, even if a different frequency data channel. segment is used for the depth call.
l A-7 I
COMMONWEALTH EDISON i
, a Byron & Bra dwood Uruts 1 & 2 Anahuss Guidehnes - Appenda A Rev.7 Juh1994 A.3.3 Allov Property Channes denting nor do they have reported indications indicative of copper deposits.
This signal manifests itself as part of the support plate " mix residual" in both the A.3.5 RPC Flaw Characterization differential and absolute mix channels. It has often been confused with copper deposit as the The RPC inspection of some support plate cause. Such signals are often found as support intersections with bobbin coil indications > 1.0 plate intersections of operating plants, as well as volts is recommended in order to verify the in some model boiler test samples, and are not applicability of the alternate repair limit. This is n:cessarily indicative of tube wall degradation, based on establishing the presence of ODSCC Six support plate intersections from Plant A, with minor IGA as the cause of the bobbin judged as free of tube wall degradat6n on the indications. b sis of the mixed differential chernel using the guidelines given in Sectica A.2.7 of this The signal voltage for RPC data evaluation document, were pullad in 1989. Examples of the will be based on 20 volts for the 100% bobbin coil field data are shown in Figure A-15. throughwall 0.5" long EDM no;ch at all (inspection data from a plant with 7/8 inch frequencies. -
- diameter tubing. The mix residual for this example is approximately 3 volts in the The nature of the degradation and its differential mix channel and no discontinuity orientation (axial or circumferential) will be suggestive of a flaw can be found in this channel, determined from careful examination of the An offset in the absolute mix channel which could isometric plots of the RPC data. The presence of t be confused as a possible indication is also axial ODSCC at the support plates has been well present. These signals persisted without any documented, but the presence of circumferential significant change even after chemically cleaning indications related to ODSCC at support plate the OD and the ID of the tubes. The destructive intersections has also been established by tube examination of these intersections showed very pulls at two plants. Figures A-16 to A-18 show minor or no tube wall degradation. Thus, the examples of single and multiple axial ODSCC overall " residuals" of both the differential and from Plant S. .
absolute mix channels were not indications of tube wall degradation. One needs to examine the Figure A-19 is an example of a detailed structure of the " mix residual" (as circumferential indication related to ODSCC at a outlined in Section A.2.7) in order to assess the tube support plate location from another plant. If possibility that a flaw signal is present in the circumferential involvement results from residual composite. Verification of the integrity of circumferential cracks as opposed to multiple TSP intersections exhibiting alloy property or axial cracks, discrimination between axial and artifact signals is accomplished by RPC testing circumferentially oriented cracking can be of a representative sample of such signals. generally established for affected arc lengths of about 45 degrees to 60 degrees or larger. Axial A.3.4 Dentino and Conner influences cracking has been found by pulled tube exams for RPC arcs of 150 degrees when the axial The Byron and Braidwood Units have not extent is significant, such as > 0.2 inch. experienced significant corrosion-assisted j A-8
t COMMONWEALTH EDISON Byrco & Braidwood Uruts 1 & 2 Analysis Culde6enes . Appenda A Rev. 7 July 1994 Pancake coil resolution is considered interest, the low frequency channel (e.g.10 kHz) adequate for separation between circumferential is used to set a local scale for measurement. By cnd axial cracks. This can be supplemented by establishing the midpoint of the support plate careful interpretation of 3-coil results. Since response, a reference point for indication denting has not occurred at the Byron or location is established. Calibration of the Braidwood units, circumferential cracking is not distance scale is accomplished by setting the expected to happen. displacement between the 10 kHz absolute, upper and lower support plate transitions equal The presence of IGA as a local effect directly to 0.75 inch. cdjacent to crack faces is expected to be indistinguishable from the crack responses and A.3.7 Lenoth Determination with RPC as such of no structural consequence. When IGA Probes exists as a general phenomenon, the eddy current response is proportional to the volume of The number of scan lines indicating the affected tube material, with phase angle presence of the flaw times the pitch of the corresponding to depth of penetration and rotating probe provides a conservative estimate amplitude relatively larger than that expected for of crack length which may then be corrected for small cracks. The presence of distributed beam spread. cracking, e.g., cellule SCC, may produce responses from microcreks of sufficient A.3.8 RPC Insoection Plan individual dimensions to be detected but not resolved by the RPC, resutting in volumetric The RPC inspection plan will include the responses similar to three-dimensional following upon implementation of the APC repair degradation. limits: For hot leg TSP locations, there is little
- Bobbin voltage indications > than 1 volt industry experience on the basis of tube pulls for volumetric degradation, i.e., actual wall loss or
- A representative sample of 100 TSP general IGA. For cold leg TSP locations, intersections based on the following:
considerable experience is available for volumetric degradation in the form of thinning of 1) Artifact signals (alloy property changes) peripheral tubes, favoring the lower TSP spanning the range of amplitudes observed clevations. Therefore, in the absence of during bobbin coil examination confirmed pulled tube experience to the contrary, volumetric OD indications at hot-leg tube support 2) Dented tubes at TSP intersections with plates should be considered to represent bobbin dent voltages exceeding 5 volts ODSCC.
- 3) Bobbin indications less than 1 volt for A.3.6 Confinement of ODSCC/lGA Within justification of these indications as typical of ,
the Support Plate Realon ODSCC. The measurement of axial crack lengths from The 100 TSP intersections for RPC RPC isometrics can be determined using the inspection would be targeted toward a following analysis practices. For the location of distribution on the order of 40 dents,40 artifacts, A-9
c COMMONWEALTH EDISON Byron & Brelewood Uruts 1 & 2 Analyes Guldennes Appender A Rev.7 July 1994 l
- artifacts, and 20 indications with bobbin voltages '< 1.0 ~ volts; this distribution will be adjusted to l ' reflect field observations as appropriate.
Consideration for expansion of the RPC l- . inspection program would be . based on i identifying unusual or unexpected indications such as clear circumferential cracks. In this case, structural assessments of the significance of the indications would be used to guide the need for furthsr RPC inspection. A.3.0.13 coll RPC Usaae it is Commonwealth Edison's standard practice to use 3-coil RPC probes, incorporating a pancake coil, an axial preference coil, and a circumferential preference coll. Comparisons for ODSCC with bobbin amplitudes exceeding 1.0 volts have shown that the pancake coil fulfills the need for discrimination between axial and circumferential indications, when compared against the outputs of the preferred direction coils. Pancake coils have been the basis for < reporting RPC voltages for model boiler and pulled tube ' indications in the APC database; these data permit semi-quantitative judgments on the potential significance of RPC indications. The requirements for a pancake coil is satisfied by the single coil, 2-coil, and 3-coil probes in common use for RPC inspections. I l l l A-10 I
,l
!o COMMONWEALTH EDISON byron & Braidwood Units 1 & 2 Analysis Guidehnes App A Rev. 7 July 1994 1
. l l
l
' = a. . ..i.
. i, i...i is .u .,.i ii
_,,_ l
'58
_m _m am := -- l (( f, lie Mitm WM41 l 62 e
==
- 1. /
*}. - _ a.. .i, ..i .i,. . 4.
I p, __ gg -ii....,.... ItC iK
- ix . . , . - . , . . iu - = ..
8
- f I (
- r i y 4 % a
[ u s u.n in . . s i. i' y I
,, --. i.
im - r- - r p
- G i o, _! _ _
e
= -- -
= + 9 . .. -= n. . . , . . , - == -- .. ~ ..-.
i ! - ' - 4 . , ." , , _ ,
@ d :--- W-- 5 4 I e 5
d 5
--4 L I I
, i s 1,: , ,
I s I Figure A-2. Bobbin Coil Amplitude Analysis of ODSCC at TSP. l A-11 , i I
l l I
<-~m e ; } COMMONWEALTH EDISON ;
Rev.7 July 1994 Byron & Braw 2 wood Units 1 & 2 Analysis Guldelines Appendru A l
.. . ,.i, i s in i o . si si. ==. oi i o Ia. :. .
; ,m D \
t
.et t I 6tieg
- 9. =:: D Ja #
Oferft Ftm i tte l 3 C -= - I areme lit.emswess 6ftness { ac 1R l tx - - ...u - in == = . . . e in we
! . i I J l i J r I w ,
4, wi% f % # < l > h l l
% l i N u ..e 3 0 Ems Cm 3 u u .39 i3. ce ce 9 41 1 11 k i, ___ f.
y m Q is. -- y y un -- -
= --
- w- s- . . . - . .i. . i-.,
k I k ' h N +4a. a s i sa
' ;j yd *--
r ~- 7 t 4 4 wi
- S =.-
=
t i , i 7 i , i ( i e t Figure A-3. Bobbin Coil Amplitude Analysis of ODSCC Indication at TSP - Improper Identification of Full Flaw Segment Resulting in Reduced Voltage Measurement When Compared with Figure A-2. A-12
!(-l L._J COMMONWEALTH EDISON Byron & Braidwood Unts 1 & 2 Analyse Guedehnen . Appenda A Rev.7 Juh1994 mi oi i . . ai. i . ,.. o. ... in ... ..i is tsc tic 4. .
2-
= =&
--- ) = i e, i ,- a ,.
5 L d \ ., .ei a e. ite g i,.._... ix Q ix - - . - n in .. ... - im >=
'" ~
F 4 i ) i i J w i c d . < f '[5 < f N f 1 > h I u.m s.e a. a . is us.n in m. a s .,
\
{
- i. 4
^
p 4 i y it.
=
- + + ~ ...i - .
.. . . . . . .i i5.
; j- j __ ,
,; '""-l h H- 7 f D 7 !! .!
l 1 Figure A-4. Bobbin Coil Amplitude Analysis of ODSCC Indication at ' TSP - Improper Identification of Full Flaw Segment Resulting in Reduced Voltage Measurement When Compared to Figure A-2. l I A-13
.( p COMMONWEALTH EDISON L .J
. _ . . . ~
Byron & Brasowood Unds 1 & 2 Ana#yse Gindelsnes . Appenda A Rev. 7 July 1994 Tw - artT . n. . . n .... ==. .i , w IF 2- , i,.
" < ~- ~
_ q W l .a .es t et nie IE _ , . miai a p - -- em so.is ~ ,mia F 1 .
\ .
in . - iis l -{- ...-a m. . . .is - = = in .
} \ i \
ix I -- % g _A iW
'" t ~
P
> M > W \
t q \ L p 33 is in en e e ti 3 et i.s asa a is
- i. a -
- i. - -
i
- 6. - -
ia ,
- = .i
* * ' am em m m sas - es e e a. s me en j
i % , ,,, " ,,,, ,'
. < % C - i ;ll g '/
_ r s -
> i i
3
, 7 f -
Figure A-5. Correct Placement of Voltage Set Points on Mix 1 Lissajous Traces for R18C103. a A-14 r . . , y -- _. _ _ . _ y
p- ' l COMMONWEALTH EDISON ( ; syron a armowood unn 1 a 2 Ana#yee Guidelines . Appendoc A Rev.7 July 1994
= o. .......r. .... in ... ., ..,
. :! i. . . ... ....
I, g, in
=
c- p*& . iX .
,, , , .= i =, - i a
= -- .
k I h % I C
'~
nm --
*t l
%, -5 s T i F o i. ...m o ., .. . . ,.
in .. . ( i 7A 3 J ( . . = - iu . l
, 4 % % i4 T;""- :"""
i ;
^
7 P m i i ,.;; l Figure A-6. Correct Placement of Vector Dots on Mix 1 Lissajous Traces for R22C40. A-15
F ] COMMONWEALTH EDISON L_J B reemod Units 1 & 2 Analyses Guidehnes. Appendo A Rev.7 July 1994
, . , .. , ... . . .. . .. i, ..... ,.
tre U ige 4_ 'JL- sa k :U j D ) ..* l L ".',L ".. h.c i
==
% s y
,- wens n.. . i .r.
1:e iac -- :
; , . i .. - u .= .. - . .=
i< -- a %IM =L lW h b 3 I 7 7 i M
'" " ~
i .. i n o. .' . i.. ... ... . is nm -- in _ L }L ii. -- y 4g
- . N i5 .
, . .. ,n .= ... - ., ~~,
- i
= i , .. s ' ' " ' '
Q l ::;;,, _ ( l J '".: . l ,' ' W M 3' ' I L T 3!! ! l 5 Figure A-7. Incorrect Placement of Vector Dots on Mix 1 Lissajous Traces for R18C103. A-16 I l l
)
COMMONWEALTH EDISON o! . Byron & Bracuood Units 1 & 2 Analysts Guidelines Appendtx A Rw.7 M N a4 cn i v i asa i , .e i.s nia i is si ssa sn. cm i esa
= "
y 1 _ v i5 im i .e. i.i i 4 a m ii = i = i b GE === = .au i- .m'= r.e :: iiC -- - ta -- ix __ , vs. i.43 m 124 sa vos i.4J M ill 22a nac - '
!. / , -
%. h % C y
i 7- , ,
%, S T' r n.is me cm i na n ..e in a . in im
- n. __ _ _
1
. . L L
= __ -
tm
- 1 y- i j J- . T., . .a - in . v., ..n m .. .e
.i.
-- ==== .
4 ' ' \ / r'....l."' 4 ----=d. s - i '-',', i 7- , w , m t . m . . . .
=,
i , Figure A-8. Incorrect Placement of Vector Dots on Mix 1 Lissajous Traces for R22C40. l l A-17 l
1 i COMMONWEALTH EDISON ! l bU Rev.7 July 1994 l Byron & Breedwood Unsts 1 & 2 Analysis Guedehnes. Appenda A l
, o, . ....i3.w i... i. ..n .. o. . ,
. . . . l g--=g y ==g g an - = - ais - ,
m -siv- ww i J 6 ;; - d == , i. i ni.i ai. e _o o.m ,,, , , ,,
== ==.n...,,,. -
=E F, ; , .
. _ . ng ,w . -
ix __ t , ix _-
,, y . . .. - in _= in - i.
E i. (\ %- %_ %.
.7 ~ l }
d l' 'T 4!. .., . .. .. . .. . .
- i. -_ .
i. p
- _g -
(
- 1 mi m/ ... . ii. . . . . - .
- - . ..g
, j, , 3 .
% ,N ,
, l T 7 r i r ': , - : : ;
I Figure A-9. Incorrect Maximum Voltage Derived from Placement of Vector Dots on Transition Region of 550 kHz Raw Frequency Data Lissajous Trace for R42C44. A-18 l 1
r-~~- m l- COMMONWEALTH EDISON Byron & Braufwood Uruts 1 & 2 Analyses Guidetines. Appenda A Rev. 7 July 1994 24 os a v l als a v 3 . .'s tis nas a te 6.77 sse Ems os s se g Ps
=
7FMN o=. -
~ ~
u _f 18 l ae .et l .I .lga
= [ , ,
-1 u'=y fDs I ftC 1 si
.ePEIB 123.esiintese staasis ,,
LE d, ix __. ., .
,g j von J.es M sol e. von 2.se m tie um
}
- f f l l e ja f m~ %
- v. T
- i l
r ' ( l J' == m L3.51 300 Ehe 04 3 e4 13.13 130 EBu CM $ ee ) 11M H== f / L H p d \ ) m --
%% ~ J '
a -- a.g sti=esees
.e==
rta -
- w. ma um ,,o i. m a e. .. 1n .
b rus 4 snie e irsi C !'::
^
l C ; 2 N ';ll , ; i
-a I ; F i c ....
,i.
i i .. c- , ; j . Figure A-10. Correct Placement of Vector Dots on Mix 1 Lissajous Figure for R42C44. 1 i A-19
1 L j COMMONWEALTH EDISON Byron & Bradwood Uruts 1 & 2 Analyses Guidehnes. Appenda A Rev.7 July 1994 1 I
. . . . .... . . . . ... .. . .. .. ie i.
s k
= -
, m i....
fg , sNEB lai.eiliwans passes tic l I tx ,.
- m i > v. i .m M ta. i .m - iis I* * *
) i
( 6 ) ! (
.. , s a w <
sm .. % % N im L
\ r \ '
f . is..i me == m : .e i... in m. e i .i ssa - - / 1
. I N ^
m i 7 ( - IM ' - lHm
.gy i,.1 M 49 fig vm 3.3 3 ggg g aus ese i 13 sang ags
) ! ( ) / -l.,,,."",, ,
. e ; % --s==:; i-i. .
P ! > ~ -
' 1; ;
\ ' " " '
r s / B Figure A-11. Placement of Vector Dots Based Solely on Mix 1 Lissajous Figure (no significantly sharp transitions in any of the raw frequencies)- R10C44. A-20
l L J' COMMONWEALTH EDISON Byron & Braidwood Uruts 1 & 2 Analyses Guidet.nes. Appendet A Rev. 7 July 1994
.4 os a v os s y a..a i;s nas i to i s.ss sie asu os i as Tic
- --- ;p,, ., .
, g\_ D O ,
, i, i.is. m un 1
)
a umn m o m I um sn.wie smin j t w ..a -= = = e.u ei 5.
) i f s' I I (
7-k J r , s p ,_ e -<- p L
'- J / I /
i, ,.. n . i. = a. a ai.i. in o, s u in -- is. -- is,
~
w-
= -- l m -- - 1 w a.= .. . - !
, - .. .. = i . >. - n - - . .e ;
;;c .2- 1 ( l mm M. ____%
I s m I L -. . . . . . ."1
- > > w '.,l.:
' .; l ., ,
{ j j ; , , ., i 1 I Figure A-12. Placement of Dots Marking Mix 1 Lissajcus Figure for R16C26. A-21
_m . _ , _ _ . . . _ - ._ _ m. ._._ l c '
~
COMMONWEALTH EDISON c_ r-+Ep Syron & Secod Unsts 1 & 2 Anahses GuWehnes. Appender A Rev. 7 Juy 1994 l 1 f 1 sse cia on i t , j 2 es til ass a to ' e sa
.H := a v i os s v
"" I l
th I e.es tit que g314W4 14h I LC . I M 1C ":3- 3 sette tat.a.inswees eveneen j g ==:- u ' N 2 Q
% b ut veo a.sg m 79 4e vee 6.2. m as ee 1X l
# i ( / t (.
xx -- 5 i d %- I <
% % ,% \ r *
/ t ( < l l ( .
me a> - n.te in . . n l
; .. is.a.
- i. _,-
im - _ _ 1 l f u,, __ e ,
" ~~
- s. . .. -.
i i 5 ...,. ." i. m ., f d N m P" J 4., 4 W M 1%
=f
% T t ~ r-t
= '
, , s Figure A-13. Incorrect Placement of Vector Dots Marking Mix 1 Lissajous Figure for R30C74.
A-22
I l a COMMONWEALTH EDISON Byron & Broadwood Unas 1 & 2 Arwyne Guidehnes . Appendor A Rev. 7 July 1994 6.' s.72 558 ou m i at
. 33 , ag, i cw s v i 2.,g its als t I
i us omm a m 1.as.setii :lin l atom to i is i a T, ,_ e m s m .em i w e n i m es t;
- l d EE '
I sc _ , _
- I ne == s uc --
l i si) > i 4 l
~~
9 I 9 I f i
~ ..
,,c __ . ,
,,,,,-. oi : ai.ie as == ca 5 't -
- i. _.
im -- _ to -- s,) inn -- I "."' -
'"*"'"*'l"'"
l a v. s .n u aus a ( ,,,, ... - a , , m , , , , , ., ,, u., ,; .. .. . l c I w. i
~
4 N M - I Y_ ". ', i
,.i
, f r r I -r l l 1
l Figure A-14. Correct Placement of Dots to Effect Maximum Voltage - R30C74. ! 4 i A-23
F7 ' u ) COMMONWEALTH EDISON Byron & Bradwood Units 1 & 2 Analysis Guidehnes . Appendor A Rev.7 Juy1994 i is e :n i e i mis a v s se .es an. cm i a.e . 12 24. ais a .a E J - 400/100 A'bsolute ""
, Loans t y ,..f. I in 6 4.aee i .to..m3
' j/ Esituti ess 6 os .
g / % SMI5 to.* w .as.es LN I , , f. i E-7 J.
' M; /
i 1 e 2.n :: on .. . a.i. = an .. < r: T l I
==o t 1 2
(-w I / w 7 M % _4 A i -- I i '\ f \[
... i.i . i asa ii... . . cm a m T
r 400/100 Differential 5. a
/
[ i -- h , I b I N. m. t - .. u ,. ..
. a.., . ,. . . . . . i. .. <
i nj,;;a .= F l i ) l / ( l ! l,. . . , . . ...., .. [- j. =* w
- = ^ ' l . '
w r - , . . . . B-- , _ i i } T I ', ' * ' ' I Figure A-15. Example of Bobbin Coil Field Data - Mix Residual Due to Alloy Change. l 1 A-24
L .- ) COMMONWEALTH EDISON Byron & Bradwood Uruts 1 & 2 Analysis Guidehnes . Appenda A Rev. 7 July 1994 w.. o. . , o.. .m ne n. . = gi m a m 8f . l'"".:
' :" 1 ,
;; a==
. - . . . . . . . . . . i .e . . , ,, ,, , .
e
,,,;,,,r ..., = , i n
... i r. i .e., ic i =p. i. was i .a i .. i=..
,,, i . n as = =
\ t f . . . . .
f Ct8138RMIffle. Ef e .8 MS
--( 7 ...
g ,
.n me
/ m =,. -
, . sn. ..a in ,
i X .
.f l ! I I
Figure A-16. Example of RPC Data for Single Axial Indication (sal) Attributed to ODSCC - Plant S. }
- A-25
t ; COMMONWEALTH EDISON Byron & Braidwood Units 1 & 2 Analycas Guidehnes Appendor A Rev.7 July 1994 l 30 C. 4 V DI 9 9 4.49 3M EBle CBI 4 M @ M E M I
._=.=,..... .. . . . , , , , ,,,,
i m'=i fBs l vm l 3 gen 7 M lClatlassal WEB e.Mitswone Hab815 - vpp 4.18 MS 3, M
/ 1 t_ h .
N 3
/ )
g M,=...
' cisasva nnia m . in ass 5 :
..a 110ee.48
-e.si me i maan
.sm. an. e.m in .
i
~
N s 'i , Figure A-17. RPC Data for Single Axial ODSCC Indication (sal) - Plant S. 1 A-26
g i COMMONWEALTH EDISON t_ o Byron & Bradwood Unds 1 & 2 Analysm Guidelines . Appenda A Rev.7 July 1994 mi os e v os e 9 a.es me me on e les @ 4 E D 1 fM e essessem sie esEL es. e sans tsames is assans rswessus sownsesiewsma a i.e.. g,g gggg
,,,,,,,,1" sNTElffl D l 7318 i M h
( csus qvessesas lctactasia spam te.satsu Ivanise c j _ as ff as var e.m
)
~ 2 W- T E
h
'=
- ast& VlS C1 M it IITs 34 MS
-e.e3 m f m.m e.n e
=ia enem
. mia sNT. e.. is ,
j [ Figure A-18. RPC Data for Multiple Axial ODSCC Indications (MAI)- Plant S. 1 A-27
COMMONWEALTH EDISON a t
, . an ie. N*** e es es .,m .e
~
, 2 5. h. *.
1
+=
il /r n ; l
-1
,, ,,, m .-. ... .. a. -
o i": : E 9, == 6'
=
= = ...
_ ,, - .=. -- 1 Figure A-19. RPC Data for Circumferential ODSCC Indications at Dented i Upper and Lower TSP Edges. l A-28 i
_ma +A ..- - w-_. ss & 1 + as n-- u - -e a + . m, ..w+ 1 a..--e-6 l APPENDIX B ANALYSIS GUIDELINES CHANGE FORMS d m e I, I h a D I 4 4 4 vm-, -w,4,, ,- , ,- .,-w
APPENDlX B ANALYSIS GUIDELINES CHANGE FORMS (PAGE 10F 2) ANALYSIS GUIDELINES CHANGE FORM
Subject:
DESCRIPTION OF CHANGE: REASON FOR CHANGE: TECHNICAL BASIS: EXAMINATION IMPACT: AUTHORIZATIONS:
. .g Lead Analyst Date: / /
CECO Acknowledgment Date / / l B-1
APPENDIX B ANALYSIS GUIDELINES CHANGE FORMS (PAGE 2 0F 2) ANALYSIS GUIDELINES CHANGE ACKNOWLEDGMENT FORM Change Notice # : EFFECTIVE DATE OF CHANGE l_ , __I TIME I am pm . Analvst Sianature D.ida, Tima i I ; -- 1 I - - - I I ; 1 I : I I ; 1 I ; I I ; I I ; 1 I ; 1 I --- - 1 I --- -
/ I _-
B-2
4 a -.n. 4e. - a w A n -, a p--
.._ 7m APPENDIX C ANALYSIS & RETEST CODES
i Appendix C (Page 1 of 2) Analysis & Retest Codes Categorf 1 - No Further Action Analysis Retest No Detectable Degradation NDD RND Plu0ged PLG - Sleeved SLV RSV Positive indentification PID - Category 2 - Possible Flaw, Further Action Required NorHsuantifiable Indication NQI RNQ Absolute Ddft Indication ADI RAD Distorted Support Indication DSI RDI Distorted Tubesheet Indication DTI RTI Distorted Roll Indication DRI RTl Single AxialIndication sal RSA Multiple AxialIndications MAI RMA Single Circumferential Indication SCI RSC Multiple Circumferential Indications MCI RMC Mixed-Mode indications MMI RMI Free-Span Signal FSS RSS Free Span Indication FSI RSI Lead Analyst Resolution LAR RAR Category 3 - Possible Loose Part, Fusther Action Required PLP RLP o lPossible Loose Part Category 4 - Further Action Required, Retest , l Condition l Bad Data RBD RBD incomplete Test INC RIC Obstructed OSS ROB Template Plug TMP RTP Tube No Test TNT RNT To Be Retested TBR - Fixture FIX RFX Tube Number Check TNC RNC l 1 C-1 i l 0
l Appendix C' , (Page 2 of 2) Analysis & Retest Codes (Cont'd) Category 5 - No Further Action Required Analysis Retest j Bulge BLG RSL Copper Deposit - CUD RCD Dent DNT RDN , . % ,, Deposit DEP RDP Ding DNG RDG . Distorted Roll Transition Signal DRT RRT Distorted Support Plate Signal DSS RDS Distorted Tubesheet Signal DTS RDT Expansion EXP REX Indication Not Reportable INR RNR Indication Not Found INF RNF Manufacturing Bumish Mark MBM RBM , Manufacturing Anomaly Mark MAM RAM Noisy Tube NSY RSY Over Roll . OVR RVR , Overexpansion OXP RXP Partial Tubesheet Expansion PTE RTE : Permeability Variation PVN RPV Skipped Roll SKR RSR Sludge SLG RSG Top Main Roll TMR RTM Volumetic indication (s) VOL RVL Free-Span Differential FSD RSD Shot Peening Anamoly SPA RPA ; 1 I l I C-2 I i f _ - _ _ _ - _ - .- _ - /
e - 4 , ,4
- t 69 de.
APPENDIX D , SUPPORT STRUCTURES NOMENCLATURE AND MEASUREMENTS l l 1 l l f 1 l l l l
Appendix D Support Structures Nomenclature and Measurements (Page 1 of 3)
- Westinghouse Model D4 SIG Support Structures Measurements
~
Ayn - ays av v4 hh % Level (inchee) 11H 11C Tube End 0 0 Tubesheet 21.2 21.2 10H 10C top Center of ist 6,4 6.4 09H 000 structure Center of - 12 2nd structure l OSH osC Centerof 3rd 30 18 I structure ) 07H 07C "
- IO l
structure i
Osc Center of 5th 36 18 05H C structure l ,o4 Center of 6th - 18 structure ,
3H - = = {Osc- Center of 7th 36 18 02C structure O Th$1Mi2 A DiCTsc Centerof 8th 43 - TEM TEC Center of 9th 43 - structure g C of 43 - structure Center of 43 - 11th structure l I l l l D-1
Appendix D Support Structures Nomenclature and Measurements (Page 2 of 3) , Westinghouse Model D5 SIG Support Structures Measurements Elevation Spacing Ave ^ve L.evel (inches) l V4 AV Not leg Cold-leg
, Tube End 0 0 MH MC Tubesheet 21.2 21.2 top ION 10C Center ofist 6.4 6.4 structure Center of - 12 DeH OeC 2nd structure Center of 3rd 28 18 structure Center of 4th - 18 ,
structure 07H 07C Centerof 5th 36 18 o Osc sMure OSH oN - M i structure m Center of 7th 36 18 03H C structure 02C Center of 8th 43 - TSH 01H . 01C TSC Centerof 9th 43 - TEH{ }TEC structure Center of 43 - 10th structure Center of 43 - 11th structure D-2
Appendix D Support Structures Nomenclature and Measurements (Page 3 of 3) Structures Nomenclatur's Notation Description TEH Tube end hel TSH Top of tubesheet- hot leg 01H ist support plate - hot leg 03H 3rd support plate - hot leg 05H 5th support plate - hotleg 07H 7th support plate - hot leg 08H 8th support plate- hotleg 09H 9th support plate - hot leg 10H 10th support plate - hot leg 11H 11th support plate - hotleg AV1 1st anti-vibration bar + AV2 2nd anti-vibr6on bar AV3 3rd anti-vityation bar AV4 4th anti-vibiation bar 11C 11th support piste - cold leg 10C 10th support plate - cold leg 09C 09th support plate - cold leg 08C 08th support plate- cold leg 07C 07th support plate - cold leg 06C 06th support plate - cold leg OSC 05th support plate - cold leg 04C 04th support plate - cold leg 03C 03th support plate - cold leg 02C 02th support plate- cold leg 01C 01st support plate - cold leg TSC Top of tubesheet- cold leg TEC Tube end cold D-3
1 a \ ATTACHMENT J REFERENCES
- 1. Regulatory Guide 1.121, " Basis for Plugging Degraded PWR Steam Generator Tubes," Revision 0, August 1976 (issued for comment)
- 2. ' Draft NUREG-1477, " Voltage Based Interim Plugging for Steam Generator Tubes-Task Group Report," June 1,1993
- 3. EPRI Draft Report NP 6864-L, "PWR Steam Generator Tube Repair Limits:
Technical Support Document for Expansion Zone PWSCC in Roll Transitions
" Revision 2, August 1993
- 4. EPRI Draft Report TR-100407, "PWR Steam Generator Tube Repair Limits -
Technical Support Document for Outside Diameter Stress Corrosion Cracking at Tube Support Plates," Revision 1, August 1993 -
- 5. Westinghouse Letter Report NSD-TAP-3069, "Braidwood 1: Technical Support for Cycle 5 S/G interim Plugging Criteria, Pre-WCAP Release," April 21,1994 4 !
- 6. Westinghouse Letter CAE 94-200, " Byron Unit 1: Steam Generator Plugged Tube Growth Data," July 29,1994 i
l l I I y l i i
- - - v- - - - - - -- - . . , , - . - , . . ~ . - v-- , , . - . . , , - . , . - . - , , . - -
- - - . - - - - - - - _ , . -}}