ML20069M724
| ML20069M724 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 04/10/1994 |
| From: | BABCOCK & WILCOX CO. |
| To: | |
| Shared Package | |
| ML20069M635 | List: |
| References | |
| PROC-940410, NUDOCS 9406220113 | |
| Download: ML20069M724 (48) | |
Text
e.w ;:r:.: :u B&W NUCLEAR BWTECHNOLOGIES Specast Awducts a kd+; _:_# SeMose i
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!! CRYSTAL RIVER is
!i UNIT #3
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j' EDDY CURRENT DATA is Ii ANALYSIS GUIDELINES 55 is i?c E2 Z~
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g Prepared by: Date:
82 H. L. Smith I En 22 il Reviewed by: Date:
g *- R.M. Barnes as 31 Approved by: Date:
- I T.A. Richards 5
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I"l 9406220113 940419 4*-
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TABLE OF CONTENTS PAGE #
SECTION *
1.0 INTRODUCTION
C-CRYSTAL RIVER UNIT #3 4
$5 2.0 y STEAM GENERATCR CHARACTERISTICS 21 si 3.0 OPERATING HISTORY AT CRYSTAL RIVER 5
~1 UNIT #3
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<7 7
'l 4.0 DATA ANALYSIS EQUIPMENT 5.0 DATA ANALYST GUIDELINES 8 5:i s
BOBBIN EXAMINATION is 8
- f
- e 5.1 RESPONSIBILITIES a=
- I 9
.=
I" 5.2 PERSONNEL QUALIFICATIONS sr 10
'i 5.3 SPAN & ROTATICN SETTINGS ji 10 M5 5.4 MIXES 10 i$ 5.5 NORMALIZATION i*
zu 11
- N 5.6 CALIERATIGN CURVES I 11 I.2 CALIBPATION ENTRIES
!" 5.7 12 55 5E 5.8 EVALUATICN 5? 12 6.0 REPORTING REQUIREMENTS ll2 v 14
- s 7.0 GRAPHIC PRINTOUTS 14
$5 gj 8.0 RERUN CODES OBSTRUCTED TUBES & NOISY DATA 15
!!s 9.0 DISCREPANCY RESOLUTION
- 20 la
- i 10.0 COMPUTER DATA SCREENING c
- 21 s a s
11.0 SLEEVE EXAMINATIONS si H
11 63 PAGE 2 OF 4 3 TDOS DATE: 04/10/94 CRYSTAL RIVER REV.: 1 UNIT #3 DWG.: 1217317A
~ " "" o o r M "' DATA ANALYSIS GUIDELINES
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",+9/ F,c-im a integrated Sorwicos j I TABLE OF CONTENTS (CONT.)
27 AI'PENDIX A - RFC ANALYSIS GUIDELINES 36 ATTAC24ENT #1 - OTSG ELEVATION MAP 0; -
F0Fl4AT FOR ENTERING DATA ATTACS4ENT #2 37 i3 RECORDS AND CALS
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- 3 38 ATTACHMENT n3 - ANALYST CODE LISTING ji
- TYPICAL SLEEVE CALIBRATION
! ATTACHMENT #4 STANDARD 39 l
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c '- ATTACHMENT #5 - DETEF14INING S/N RATIO
=> 41
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-4 ATTACHMENT #6 - TYPICAL ROLLED PLUG is 42
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- CDS ANALYSIS SORT VARIABLES 32 ATTACHME!
er se 43 ATTACHMENT 4B - CLIP PLOT REPORT ENTRY Ji
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OF 43 PAGE 3 Tr05 DATE: 04/10/94 CRYSTAL RIVER REV.: 1 UNIT #3 DWG.: 1217317A EDDY CURRENT DATA ANALYSIS GUIDELINES m
BW 080; 29 B&W NUCLEAR BWTECHNOLOGIES sp w : 1 a aen.or es.nd 1.0 Introduction 1.1 Purpose
. The purpose of this document is to establish guidelines that are to
!; be used by personnel performing eddy current data analysis at This guideline was developed to establish
- 3. j Crystal River Unit #3.
i consistency in the analysis process and to ensure that the results
!;! of the analysis are in compliance with requirements of Florida
?? Power Corporation.
-u B&W Nuclear Technologies technical procedure ISI-460 shall govern la
'l the evaluation and reporting of eddy current data for if nonferromagnetic steam generator tubing. All requirements n
55 specified in this guideline are in addition to those specified by ISI-460.
- h
!j 1.2 References Pr 1983 Edition, im ASME Boiler and Pressure Vessel Code Section XI, 5i Summer 1983 Addenda.
ii
!jjg PWR Steam Generator Examination Guidelines, NP-6201, Revision 2, December 1988, Electric Power Research Institute, Table 4-7, and 35 Accendix D.
- e rs jj American Society of Nondestructive Testing SNT-TC-1A 1975 Edition.
M crystal River 3 Technical Specification 4.4.5/SP-305, OTSG ja j Inservice Inspection.
-! 2.0 Crystal River Unit #3 Steam Generator Characteristics E=
h ej 860 MWe Pressurized Water (PWR) Babcock & Wilcox 2 Loop Nuclear Stear Supply System (NSSS).
~i l? Steam Generators are Babcock & Wilcox Once-Through (OTSG) containing j! 15,531 tubes per generator.
M 53 Tu'o ing material is annealed CrFeNi alloy Inconel 600 with .625" OD and
!! .034" nominal wall thickness that has a sensitized micro-d structure resulting from the post-fabrication stress relief heat b treatment.
y The tubesheets are open crevice type with a 1" to 2" hard roll near im the tube ends.
s' TD05 PAGE 4 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
- w. :ea ; m B&W NUCUEAR BWTECHNOLOGIES W Areduoss d Amespresed SeMemo 1
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The outer periphery 15s tube support plate (TSP) (2 or 3 tubes in toward the tube bundle center) are 1.50" drilled carbon steel. All other TSP's are 1.50" broached carbon steel.
q The "B" OTSG UTS tube ends were severely damaged in 1978 from a I
); Icc e burnable poison rod assembly (BPRA).
is jj 3.0 Cperating History at Crystal River Unit #3
?!
!; 3.1 Crystal River Unit 3 began its 9th fuel cycle in July 1992. arn fuel cycle 9 is completed on April 7th, CR-3 will have 10.2 EFPY 3; At the completion of the eddy current examination 13 of operation.of the two steam generators in Refuel 8 the following number of li lj tubes were plugged.
is E A B i Steam Generator - -
p! Total Tubes Plugged 42 120 3
er 1r si Several areas where indications are developing in the A-0TSG
3.2 include
wear in the lane region at the 15S TSP, wear in the ji gj periphery region at the 08S, 09S and 10S TSP's, jg Forand the an unknown B-0TSG, the damage mechanism at the 07S and 08S TSP's.
areas include: wear in the lane region at the 15S TSP, and 10s an 25 j{ unknown damage mechanism in the periphery region of the 09S, i0 and at the 07S and 08S TSP's.
k8 gj Emerging Areas of Interest i'
a' Areas with significant eddy current OD general, OD wear, and ding Ej indications for the most recent refueling outage examination of l5 the A-0TSG and B-0TSG are identified.
l cI '! A-0TSG 5 OD w ar indications in the periphery region at the 08S, 09S, and 3; 10S TSP's, and in the lane region at the 15S TSP.
as l I! OD general indications in the interior region at the LTS-1st j
'l span. .
is l
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==
B-0TSG
'a s
- OD general indications in the periphery region at the 07S and 095 l
(!
! TSP's.
-fa PAGE 5 0F 43 l TD05 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 DWG.: 1217317A EDDY CURRENT DATA ANALYSIS GUIDELINES
e BSW NUCLEAR BWTECHNOLOGIES speedst M=ss a huesprosed Sendees i
LTS-1st span CD general indications in the interior region at t l l
and at the 07S TSP. the UTS. l OD general indications in the lane region at the 08S and 095 OD wear indications in the periphery region at d;
y TSP's.
the UTS and LTS.
?? Ding indications in the lane region at l River ii
$E These areHowever, the most theprevalent followingproblems regions occurring and their atassociated Crysta j_ Unit 3.
d damage mechanisms within OTSG's are also areas of in concern.
!! i face inng the the
!I High Cycle Fatigue - OD circumferential cracking occurr 3.3 vicinity of the 15S TSP or upper tubesheet secondaryThe initia cf ~
from
(( open lane / wedge region. This type of is fatigue is believed to be a combination of surface fretting and high crossflow velocities.
damage gj corrosion, stion This problem has rollbeen addressed by sleev e
!! to just below the 15S TSP.
si from the upper tubesheet
,ji discontinuity
- An erosion / corrosion type 1 3.4 Impingement Erosion ig 5ccurring from the flow of secondary side water with contam This
' is or debris entrapped in the secondary side water fluid steam.It jj will cause tube wall loss just above the affected TSP. d above) g generally occurs at or above the upper TSP's (105 TSP an
- in tubes near the outer periphery, in tubes ja u
3.5 Wear - Wear fretting of hasthe occurred at TSP intersections tube bundle. Wear may be contact flat or
{j near the periphery h d TSP g'j tapered, and may occur at one or more it of the broac eis generally de drilled hole locations;
-l.y areas or at 09S TSP through the 15S TSP ).
the upper TSP's ( are the si ni (MBM) - So called buff marks tubing ll 3.6 Manufacturing Buff Mark _s result of final hand polishing or grinding operations on ld during manufacturing. Polishing or grinding may also c.
j! !
working which can result f f mark y!
5 This type of indication may occur anywhere on the tube. Buh
!! indications typically have a strong absolute coil i Ij an axial er. tent not pronounced or evident at all; is coil response is usually the indication may measure deep.
!! although when present l (j ,
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DATE: 04/10/94 TD05 CRYSTAL RIVER 1 REV.:
UNIT #3 DWG.: 1217317A EDDY CURRENT DATA ANALYSIS GUIDELINES
1 l
wn:am a n BGW NUCLEAR 1 BWTECHNOLOGIES speaw pro
- men a we seesme 3.7 other T=es of Degradation - Some small and large amplitude signals nave been observed in the boiling region of the tube bundle. These are typically multiple, small amplitude signals within a couple of inches of each other along the tube length.
The ma3crity of these :.ndications were found between the LTS and
$g the eighth tube suppc _ plates.
52
=a is The defects responsible for the low voltage eddy current signals ji in the first span region consisted of small, relatively shallcw, 5- isolated patches of OD-initiated IGA. The IGA damage was d associated with a non-uniform deposit pattern, concentrated in an
!} area 8 to 18 inches above the secondary face of the lower tube sheet. The corrosion was attributed to low-temperature, reduced-sulfur attack, which probably occurred early in plant life and is 6@jfg no longer active. The bobbin coil eddy current technique was 15 successful in detecting this damage, detecting all IGA patches
?j with depths greater than 50% through wall and ~80% of those with j; depths equal to or greater than 40% throughwall. Additionally, is lab tests determined that the IGA had almost no effect on the Yi burst strength of the tubing.
i h 3.3 IGA - Secondary side initiated intregranular attack (IGA) has jg been identified in the upper spans and within the upper 28 tubesheet. Generally these indications have been seen in the lane and wedge regions of OTSG tubing.
I, 4.0 Data Analysis Equipment I8 g 4.1 Hardware and Software Requirements t'
-' The equipment, material and document requirements are governed by l Ej the nature of the job, plant request and procedural requirements, l h
ej 4.2 Examination Frequencies l'
!5 h 600 kHz Differential - This is the inspection frequency to j] satisfy the ASME code requirements. This requires a phase angle 3; between 50 degrees to 130 degrees from the signal of the 100%
j! through wall hole to the signal from the four 20 percent flat d bottom holes, rotating clockwise.
25 3 600 kHz Absolute - Defect confirmation and TS profiling.
!! Used defect detection' and
(( 400 kHz Differential -
for
{m confirmation.
?!
ja 400 kHz Absolute - Defect confirmation.
TD05 PAGE 7 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
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BWA'sEMain W A i :- a 2 , z -f Sarudoes i
200 kHz Differential - Used for a mix component (TSP suppression) and defect confirmation.
200 kHz Absolute - Defect confirmation, j
$; 35 kHz Differential - Used for structure locating.
j!! ; 35 kHz Absolute - Used for structure locating and sludge or j! debris measurements. (See Attachment #1 for location of i? structures).
~*i j;
~2 4.3 Frecuency Mixes j! Mix #1 - 600/200 Differential - Carbon steel support suppression gj for indication measurements at tube support plate intersections,
?r tube sheet crevice, and free span when associated with deposits.
45
$j 4.4 Probe Description is .510" diameter Magnetic-Bias high frequency probe im A510 M/ULC/HF "i designed to detect discontinuities and other tubing variations.
33 They have flexible centering devices for optimum coil centering.
jg These are used for standard bobbin coil examinations.
ik AX400 6FLC/DIFF -
.400" diameter combination Cross-wound / differential arrangenent for detection of ll coil discontinuities at roll transition expansions in tubing that has jN, E been sleeved. The differential coil is used for detecting ja discontinuities in the straight section of the sleeved tubing.
is g5 Other probe sizes and variations in coil configurations are !
ji acceptable provided they meet the requirements of codes and procedures for the steam generator tubing examination. Prior li*;: approval from Florida reoresentative must be obtained.
Power Corporation's ISI Section 35
$5 5.0 Data Analyst Guidelines - Bobbin Examination ns ac
?j 5.1 Responsibilities 3.1.1 One individual will be designated as the Senior Analyst.
ji The Senior Analyst is responsible for:
is
!! 5.1.1.1 Evaluating eddy current data in a manner consistent (j with the analysis guidelines presented herein.
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5.1.1.2 Modifying the analysis guidelines, with concurrence of FPC, to accommodate new ct unanticipated l
TDCS PAGE 8 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
l emi:em 3 n B&W NUCtJEAR BWTECHNOLOGIES i
W Asshoes a hiempresset Sarudoes circumstances and ensuring that all Lead Analysts and Analysts understand and adapt to the change.
l 5.1.1.3 The Senior Analyst may assume the role of Lead l .
Analyst and/or Analyst.
! !i fii 5.1.2 Each shift will have a Lead Analyst. The Lead Analyst is i;t responsible for:
i;? 5.1.2.1 Evaluating eddy current data in a manner is consistent with the analysis guidelines presented
!! herein.
!I sy 5.1.2.2 Alerting the Senior Analyst to conditions present l c5 in the data which are not addressed by the j sE analysis guidelines.
$i 5.1.2.3 Resolving discrepancies identified between primary I
j; l is and secondary analysts. I fi ji 5.1.2.4 The Lead Analyst may also assume the role of a gj primary or secondary analyst. He may not resolve i g his own analysis results if he acted as the 55 primary or secondary analyst.
i, j 5.1.3 The Analyst is responsible for:
s ljI g
5.1.3.1 Evaluating eddy current data in a manner consistent with the analysis guidelines presented g5 herein.
.s Ej 5.1.3.2 Alerting the Lead Analyst to conditions present in lj the data which are not addressed by the analysis guidelines.
eg Ej 5.1.3.3 Acting only as the primary or secondary analyst, il not both, for a given reel of data, ii jj 5.2 Personnel Qualifications
- i 5.2.1 Personnel analyzing data shall be qualified in accordance
$s with SNT-TC-1A (1975 edition) and certified to Level II or
!! Level III.
- s 5r im 5.2.2 In addition, the analyst shall have received specific
!! training in the evaluation of data from non-ferromagnetic f* tubing and have successfully passed the practical TDOS PAGE 9 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
S W F L""a R M M Areelsses a Assepreesd Sarednes examination specific to Crystal River Unit 3 sceam generators.
5.3 Span and Rotation Settings
,d; 5.3.1 Set the 600, 400, and 200 kHz differential channels with
$g the single 100% through wall (TW) hole signal at 40 degrees j; phase angle plus or minus 3 degrees, starting down and to g! the right with a span setting that measures 50% of the H screen height.
li 5 5.3.2 Set the 600, 400 and 200 kHz absolute channels with probe
!) motion or tube inside diameter noise horizontal and the jf 100% TW hole starting up and to the left with a span 6 setting that measures 25% of the screen height.
EE is 5.3.3 Set the 35 kHz differential channel with the broached tube
- j support plate signal horizontal starting left and a span setting that measures 50% of the screen height.
h 22 Si 5.3.4 Set the 35 kH absolute channel with the broached tube ji support plate signal starting vertically down and a span j setting of 50% of the screen height.
11 15 5.3.5 Span and rotation alterations may be made as necessary with gj the approval of FPC for selected channels to accommodate
~q special analysis routines such as tubesheet profilametry.
I.
y ;
5.4 Mixes l5 5.4.1 Mix #1 a
55 A 600/200 kHz differential mix shall be established as the l! primary TSP suppression mix. This mix shall be accomplished ei by using the broached TSP in the calibration standard.
Ei Adjust the phase such that tube noise is horizontal, and l the 100% TW hole is starting down and to the right with a i!s: span setting that measures 50% of the screen height.
ji 5.4.2 Additional mixes may be included for supplemental H Information if desired.
It -
- 5 2
II 5.5 Normalization
- 2 54 12 The voltage of all channels shall be normalized in reference to
!! the 600 kHz differential channel. The four (4) 100% throughwall f* holes shall be set to 6 volts peak to peak off the 600 kH:
TD05 PAGE 10 0F 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
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differential. This shall be saved and stored to all other channels. If the calibration standard doesn't have four (4) 100i l l throughwall holes, then the four (4) 20% flat bottom holes shall be set to 4 volts peak to peak, saved and stored to all other l channels.
9-e I; Note: Previous voltage normalization was done by setting the T3 broached TSP at 4 volts off the 400kHz channel.
- ! Therefore comparison of the voltage from previously
!? called indications should not be made unless the old
- data is normalized with the new criteria or a is correction factor is applied.
fi 4. 5.6 Calibration Curves i[ it 5.6.1 Differential Phase Analysis Calibration Curves ij Calibration curves shall be set for the 600, 400 and 200
- = kHz differential and Mix #1. These curves shall be three
$$ point phase analysis curves, using the 100, 60 and 20% TW Yi holes. The actual as-built depths for each of the ji calibration points shall be used. Phase angle measurements j: should be made with the MAX RATE function.
Eh 25 5.~ Calibration Entries 5e rg jn 5.7.1 All calibrations shall be entered to the final report as a sf Row 999 Tube 999 entry. These entries will be made at the jt beginning of the calibration group (initial cal.) and at ei the end of the calibration group (final cal.) and at any j) interim 4-hr cals as required. Calibration information shall be entered in the appropriate field as shown below: l35 2 Row Col Volt Deg %TW CH Location Extent
!! 999 999 Cal
- Time CAL Probe Dia.
Cal No. Cal Message Analyst ID 13 na t= 7; Attachment #2 gives some examples of typical calibration entries. 5 3
- e ntries shall be military time and right-justified in the field.
15s ji The tolerances for calibration checks in which no equipment change or is otner changes were made to the acquisition set up (4-hour cal checks, H for example) are as follows: plus or minus 1 volt, measured off the l ij flaw used for voltage normalization; plus or minus 3 degrees measured ! (m off the single 100% TW hole. Calibrations outside these tolerances !
!! should be brought to the attention of the Senior or Lead Analyst to f8 determine whether data acquired between cal checks is acceptable. If I I
TDOS PAGE 11 OF 43 I CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 121731'A
em :sm.: 3u B&W NUCLEAR BWTECHNOLOGIES sp w es:e a n _:2 s.nd data is acceptable, a message will be placed in the final cal record (i.e. NO FINAL CAL - DATA ACCEPT). 5.8 Evaluation I 1
)
(- 5.8.1 All eddy current tube data shall be subject to two separate j I; j independent analysis. These are referred to as " primary" i i; and " secondary" analysis. I is ji Note: Secondary analysis is required to report tube degradation ! conditions only. Section 6.2-6.7 and 7.0 do not apply to 53 27 secondary analysis. ' l_ _jf 5.8.2 If no discrepancies exist between the primary and se.cndary g{ analyses, then the primary analysis results shall be l
- 5 considered as final data. )
i is ' ll j; 5.8.3 The evaluation shall consist of reviewing lissajous and strip chart displays to the extent that all tube wall im degradation and other signals as defined by this document ' si are reported and dispositioned in accordance with the i j#i requirements of this document. !
- o. g ,
j* 5.8.4 Set the lissajous to display the 400 kHz. Set the right l j$ strip chart to display the vertical component of the 33 600/200 kHz differential mix and the left strip chart to jg display the vertical component of the 200 kHz absolute 5, channel. s
!j 5.8.5 Phase angle measurements shall be made utilizing Volts MAX j; PATE for signals which have a well-defined transition. For *! cases where no clear transition exists, (i.e., open-loop Ej signals), a Volts peak-to-peak angle shall be used.
is Ei The use of guess angle shall be kept to a minimum and only Ei used when the latter two functions do not give a good
!? representation of the indications phase angle.
na NL H 5.8.6 Any indication shall be evaluated using other available jj f* frequencies to ensure that the analysis is correct.
!! 5.8.7 Previous history shall be addressed on all indications.
is [j 6.0 Reporting Requirements, si (j 6.1 All quantifiable indications of wall degradation 2 1% TWD, with a S/N ratio 2 5, shall be recorded. f3 TD05 PAGE 12 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
l l BAY [ ^3 $- 3N l B&W NUCLEAR BWTECHNOLOGIES sp ,prome.a w s.*= l l l 6.1.1 Free span indications shall be reported using the 600 kHz , differential channel. I 6.1.2 Indications at or within a TSP or Tubesheet shall be reported from the 600/200 kHz differential mix channel. I k. 6.1.3 The location, type of flaw (if possible) and %TWD shall be jll ; recorded. l 43 l 15 6.2 All indications with a S/N ratio of < 5 shall be recorded as follows: j_5 3
- ) 6.2.1 For indications with a S/N ratio less than 5, only l ji the location and type of flaw (if possible) shall be j 55 recorded with an accompanying note of "S/N" in the I if "%TWD" column.
?! 6.2.2 For all indications which represent possible (( j; 1 through-wall degradation, the signal-to-noise ratio (S/N) shall be determined. The method used to gi determine the signal-to-noise ratio is illustrated it in Attachment #5. 2* y I 6.2.3 The S/N requirements specified may be superseded by i! the data analyst and the indication assigned a iTWD jj on a "best-effort basis". ! ja 6.3 Dings equal to or greater than 5.0 volts peak to peak or greater shall be reported. This shall be accomplished using 5j the 600 kHz differential channel. All dings occurring at TSP jr .4 or tubesheet intersections shall be reported using Mix #1. !! 6.4 Permeability variations equal to or greater than 5.0 volts using the 600 kHz differential channel shall be reported. [
- g s
!i 6.5 Inside diameter chatter or "ID noise" equal to or greater
,than 5.0 volts peak-to-peak shall be reported. This will be l3 j! reported using the 600 kHz differential channel.
ii !! 6.6 The actual tube extent tested shall be reported as the gj furthest landmark observed from the entry leg. is
!! 6.7 Lower and upper tubesheet "C-type" indications shall be Ij reported. Classification of the indications shall be done by is viewing the 400 kHz channel. (See Attachment #3 for a j! -
complete listing of codes). TD05 PAGE 13 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
a e. .- 3: : ;.: B&W NUCLEAR BWTECHNOLOGIES Specsel Producte & Integrated Berncen
~.: Grachic Printouts
~.1 Any indication at the 15S TSP, UTS, and the Lane area.
7.2 All wear indications 0-100%. ij 7.3 Any indications greater than or equal to 20 percent j; throughwall. it ji 7.4 Any signal assigned a S/N OR "I" code, (i.e. S/N, DSI, DTI) will 33 require graphic printouts. is H 7.5 The printout shall be of the lissajous from the reporting if channel and the secondary graphic shall be of a confirming gi channel or "DS", if available. The actual printouts shall be
- 5 established by the Senior Analyst with concurrence from FPC.
is y 9.0 Rerun Codes Obstructed Tubes and Noisy Data es im Any tubes requiring rerun for the following reasons shall be recorded ji as indicated below: _s i gj S.1 Supplemental Inspections s= d 8.1.1 All calls occurring at the 15S TSP or upper tubesheet secondary face in the lane or wedge region to be left in H service may be examined with a rotating pancake coil y! j (RPC) for supplemental information or disposition. N: 5.1.2 All wear calls greater than 40% may be further sized and g dispositioned using RPC. This will require prior approval f by Florida Power Corporation's ISI Section
- 1 5 representative.
le sj s s.2 Obstructed Tubes I? Any tube that is unable to traverse the nominal size probe used for the inspection shall be coded as follows: si i: 8.2.1 Enter the tube nur.ber with Rerun Obstructed (RCB) code in d the percent column and the area of the obstruction in the is " location" column of the report line. I. I. Ij 8.2.2 Enter the tube MSG in the percent column and put a f message in the " location" field stating the probe size to
$j* be used with the subsequent examination. An example of P these entries are shown in Attachment #2. This sequence TD05 PAGE 14 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
sw :r;: n : 3 B&W NUCLEAR \' BWTECHN01.OGIES Spaceal Products & Integrated Bersecee l i
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should be followed for all subsequent obstructed examinations of the tube. I S.3 Noisv Data h 8.3.1 Undesirable variations are variations in recorded eddy i? current data that, in the judgement of the Data Analyst, i3 could obscure reportable discontinuities or could cause !! misinterpretation of flaw depth or location. h Undesirable variations " noise" has been determined by I p 8.3.2 d identifying any electrical or noise spikes associated !! with a faulty probe. This type of noise is readily i j' distinguishable from " tube noise" and will be rejected by
- n. the analyst to be reexamined with a new probe. In ,
y addition, the 10' sacrifici=1 cable can also induce i5 electrical noise which is eas_ly distinguishable. ==
- l j; 8.3.3 If during the data evaluation undesirable variations are the Data is noted in the recorded eddy current data, 5i Analysts shall determine what tubes, if any, to be ji reexamined.
Is 8.3.4 The Data Analyst must continuously verify prebe i= ~! acceptability for each tube examined by reviewing the jj overall quality of the data and determining if the prcbe 1s causing undesirable and interfering signal responses. jg In j 9.0 Discrepancy Resolution H 9.1 Conditions Recuiring Resolution is .c 1* Prior to any resolution an EDDYNET compare file report shall be
-i ~
generated by comparing the results of the primary and secondary g analyses. I? 9.1.1 If either the primary or secondary analyst or both, il reports a flaw indication as greater than or equal to 40 1 j percent throughwall, the LEAD ANALYST shall review the , data, resolve the discrepancy or verify the results and y!. document on the Compare File Report (CFR). N 33 9.1.2 If either the primary or secondary analyst reports a S/N
!! or "I" code (such as S/N, DSI, DTI, etc.), the LEAD y ANALYST shall review the data and determine the nature of ij the indication (flaw, no flaw, dent, etc.) and docu.ent the results on the CFR.
f TD05 PAGE 15 CF 43 CRYSTAL RIVER DATE: 04/10/94 ) UNIT #3 REV.: 1 l EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
evn:vM av B&W NUCLEAR BWTECHNOLOGIES specsel produces a hvasprosed Soradoes 9.1.3 If either the primary or secondary analyst reports a flaw indication not reported by the other, or if the difference in estimated flaw depth between the two analysts (primary and secondary) exceeds 10 percent, the LEAD ANALYST shall review the data , resolve the discrepancy and document the results on the CFR. $5 I i; 9.1.4 If, during the course of the review, the LEAD ANALYST { is overrules any defect called, ( i.e. changes a repairable ; ij indication called by primary or secondary analyst, or l j_ both to a nonrepairable call), changes an indication to i d less than 40% throughwall or to no flaw, then a second !] LEAD ANALYST is required to review the data and both ; jf shall document the results on the CFR. 15 !
- s When concurrence between the two LEAD ANALYSTS cannot be d reached, the most conservative resolution of the (
be taken, but only with FPC y discrepancy shall j; concurrence. l l is 5i In either case, both LEAD ANALYSTS are required to sign ! ji the CFR that documents the final results. II ja 9.1.5 Other discrepancies such as inconsistent extent of test, l i8 inconsistent tube identification, etc., shall be resolved jj by a LEAD ANALYST. discrepancy conditions. See Table 1-1 for a listing of i
?g ja 9.1.6 If eitner the primary or secondary analyst utilizes the j INF code, (i.e. no previously identified =>20% TWD call gr is observed) , the LEAD ANALYST will have to research this -l tube to determine the reason for not finding the Ej indication. This may involve reviewing previous history l and previously recorded data as well as " finger printing" *;g of the tube in question. The reason for not finding the 3; indication will be documented on the CFR.
Ei if 5!
!! 9.2 Documentation of Resolutions n
si 9.2.1 The LEAD ANALYST shall generate an EDDYNET Compare File Report (CFR) using the latest Version of EDDYNET 85 Q available. This document will be the comparison report in ij which the primary and secondary discrepancy will be is resolved from. il TDOS PAGE 16 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1211317A
w.- :m u B&W NUCLEAR BWTECHNOLOGIES specset products a inssenreed 8ersdoes i 9.2.2 The following parameters shall be used: (a) Voltage Plus or Minus 0.5 volt. l (b) Percent Plus or Minus 10 percent. (d) Location Plus or Minus 0.5 inch.
% equal ta or greater than 40 percent l
M All indications jj throughwall shall be reviewed by the LEAD ANALYST. it ji 9.2.3 The LEAD ANALYST will indicate when the primary or 33 secondary call stands as the final call, if the call is 27 to be changed, if a new call has been made by the LEAD 15 ANALYST or the call is to be deleted on the CFR. If the j' change required a second LEAD ANALYSTS review it will be gi indicated by his signature. The first LEAD ANALYST shall
;; be required to sign and date the first page of the CFR I; and initial all other pages.
M jj 9.2.4 All CFR's will be filed on a daily basis and will be the property of FPC upon completion of the examination. is "i
?i II i$"
se 53 if
==
ss h I) P 3! si 92 15 ii-
~i E!
55 55^ u 25 I
!}i TD05 PAGE 17 0F 4 3 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
- w :rx 3 9 B&W NUCLEAR BWTECHNOLOGIES Spearnt Products & Insepreted Servicoe TABLE l-1 Intercretation Discrecancy Standard 13 Signals indicative of tube all degradation shall be resolved if any jj of the following criteria are met:
53 -
- ?
- The indicatica has been recorded by only one analyst.
i
*1
!{
- The through wall dimension of one of the interpretations is equal to or greater than 40 percent and the other interpretation f i:.
Er is less than 40 percent through wall. is II
;I j;
- The through wall measurements differ by more than 10 percent.
51 1 ii The voltage differs greater than plus or minus 0.5 volt. l ji 55 iIse - The axial location differs by more than .5 inch. ' 4 il, j
- The through wall dimension is equal to or greater than 40
(( percent. 19 as 2 2-Tube not entered by both analysts.
*2 is Ej na Extents tested do not match.
2: Y j)
- Mis'atching m discontinuity characterization codes (WAR vs CDI,
-; DSI vs S/N for example).
23
;i fa -i
- Rerun code vs no rerun code.
52 i, j
- Different probe sizes specified in calibration recorded.
i"l I ja TDOS PAGE 18 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
sw :r:: a B&W NUCLEAR BWTECHNOLOGIES
";+:M Ptske di in*& Servicoe in The reported steam generator identifications are not agreement.
- The reported tape identifications are not in agreement.
d-
- The reported flaw location is beyond the reported extent E! of test.
is j!
- Reported probe entry sides are not in agreement. !
1; have a corresponding l j_
- Tubes reported as restricted which do not E ., extent of test.
ti l j! Use of three-letter code with no established definition. l e: l N
- Test extents and flaw elevations do not conform with the l number of support members in the steam generator.
d
==
w fu ss
'i 'i -
55 iiso;* st
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s 5.5 x= e: } it
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- s si I"
tt si
=
PAGE 19 OF 43 TD05 DATE: 04/10/94 CRYSTAL RIVER UNIT #3 REV.: 1 DWG.: 1217317A EDDY CURRENT DATA ANALYSIS GUIDELINES
l l s w i:e ca : a B&W NUCLEAR BWTECHNOLOGIES _W Hee & Integrated BeMone 10.0 Computer Data Analysis 10.1 Computer Data Screening (CDS) Analysis 10.1.1 Computer Data Screening (CDS) analysis is used as t he fg secondary analysis for bobbin coil data. 9; !l 10.1.2 The CDS Analyst should establish the Analysis Variables ~
- ! in accordance with Section 5 of this document.
i; 1 g- 10.1.3 The CR3 CDS Sort variables are restored from either the hard drive or f rom disks provided to the CDS An a l y s t . 23 S Attachment 8 provides the sorts which will be used for _i_ ji CDS analysis. i Ik 10.1.4 When permanent changes to the sorts are deemed necessary j is both the Senior Analyst and FPC Representative must concur on the sort changes. l fj ,
== 1 !! 10.2 The CDS Analyst is responsible for:
is 10.2.1 Evaluating ECT Data in a manner consistent with the ji gj guidelines presented herein. 1 10 j5 10.2.2 Operation of the CDS system, review and editing of t h e ! CDS final report to eliminate double entries, false calls l ll j~ and to ensure complete analysis of all tubes. This may l
;0 include manual analysis of certain tubes that CDS could I ll:: not screen for various reasons.
jj 10.2.3 Alerting the Lead Analyst to conditions present in t h e
-' data which are not addressed by the analystguidelines or Ej current CDS sorting parameters.
b'5 c 30 10.3 CDS Setup Ej 10.3.1 The following configurations will be used for CDS (secondary) analysis. This setup is in addition to or i! Ij replaces the normal configuration. 2:
!! 10.3.1.1 Mix P4 -
600/200 cc (cross correlation Set the cc filter to
!! filter) differential.
five. Suppress the carbon steel broached ij
!! support ring.
-a 5s 10.3.1.2 Channel 8 - 35 kHz Absolute - Set phase at i approximately 60 degrees using the 100%
$g s;* through-wall hole with the initial trace PAGE 20 0F 43 TDOS CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
- w. v: u l B&W NUCLEAR BWTECHNOLOGIES 1 specent hukate & Insepreted Services i
going up. Support plates in the steam ; generator should then be horizontal. 11.0 Sleeve Examinations h 11.1 Examinations Frecuencies s; j' A sixteen channel configuration will be used with the following g frequencies: 2: 400 Standard Bobbin Coil - This is the [ kH Differential inspection frequency to examine the free span section of the d Il sleeve and a TSP suppression mix channel.
- s 4-H 400 kHz Absolute Standard Bobbin Coil - This is a defect y confirmation cnannel, is .
?j 400 kHz Differential Crosswound Coil Sets #1 & #2 - This is a
- defect confirmation channel for use in rolls and roll
!l transitions. And the parent tubing adjacent to the sleeve end. ji May be also used with a three channel mix. p. ij 250 kHz Differential Standard Bobbin Coil - This is a defect jg confirmation channel. a v jj 250 kHz Absolute Standard Bobbin Coil - This is a defect q confirmation channel. !E 250 kHz Differential Crosswound Coil Sets #1 & #2 - This is a N defect confirmation channel and may be used with a three channel mix. .igc : 150 kHz Differential Standard Bobbin Coil - This is a defect
!{!
s confirmation channel and a TSP suppression mix. )
!i 150 kHz Absolute Standard Bobbin Coil - This is a defect h con.firmation channel, il -: 150 kHz Differential Crosswound Coil Sets #1 & #2 - This is 53 defect confirmation channel and a roll transition suppression ij mix channel. May also be used with a three channel mix.
1; , i 75 kHz Differential Standard Bobbin Coil - This is a defect l j!
! confirmation channel and a TSP suppression mix channel.
H O 75 kHz Absolute Standard Bobbin Coil - This is a defect l! confirmation channel. i TD05 PAGE 21 0F 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.. 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
1 1 w n:r: 3y l PSI 11B&W NUCLEAR l 1BWTECHNOLOGIES 1 Special Products & Irrtepreted Berwicae 75 kHz Differential Crosswound Coil sets #1 & #2 - This is a defect confirmation channel and a roll transition suppression mix channel. May also be used with a three channel mix.
. 11.2 Sleeve Characteristics $; i i The OTSG sleeves are made of Inconel 600 or Inconel 690, .525" '
j;j OD. tnd .050" wall thickness. The sleeves are rolled in place
#! with approximately 1.5" long rolls. These sleeves are 80" or 31" h long, installed at the upper tubesheet with one roll at the i; upper tubesheet primary face and two rolls near the lower sleeve is end.
U_
!? 11.3 Crosswound Examination fi !! 11.3.1 Area of Interest % The crosswound areas of interest include the rolls ~, roll ij j; transitions and the parent tubing adjacent to the sleeve is end.
fi j*i 11.3.2 Span and Rotation Settings cs Since the amplitudes of the flat bottom holes are related ig i! to their position relative to each crosswound coil set, ji the calibration standard should be rotated approximately jg 90 degrees between each calibration pull. The analyst j, should first identify which record of the calibration i ja pull set delivers the highest sensitivity to the
;; calibration flaws for each coil set, then use that pull '
( for calibration.
.ifc I,} Set all channels with the 100% TW sleevo flaw at 40 !; degrees plus or minus 5 degrees; with the phase rotation *g starting down and to the right, measuring full vertical i !i screen height, Y? !! Note: Since the coils are crosswound, any subsequent calibration pull or any other flaw may start down to the lj right or up to the left (180 degrees phase shift) !, depending on the flaw location in relation to the II crosswound coil set.
U standard is shown in
!! A typical sleeve Attachment #4.
calibration it I"! s' TD05 PAGE 22 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
we:r :n I RDillB&W NUCLEAR t LGFwTECHNOLOGIES i' R;-+%I RMucts G Integraced Servicae i 11.3.3 Mixes ! A 150/75 kH: roll expansion mix shall be made for each l coil set (2 mixes total). For each mix a clean shall roll standard be transition in the calibration suppressed. Set the 100% TW sleeve flaw at approximately j; 40 degrees starting down and to the right at a span lj setting of 50% of screen height. After mixing, ensure i; that each mix has sufficient sensitivity to detect the 53 y 40% TW sleeve and parent tube roll transition flaws (I ; and J in the Attachment #4), and that the 40% TW parent tube flaw is detectable at the sleeve end (flaw K in Attachment #4). If the sleeve end flaw is not discernible l 2
'l from a nonflawed sleeve end, a separate mix for sleeve if end suppression shall be made for each coil set. If no ai unflawed sleeve end exists in the calibration standard, y a steam generator - installed sleeve end signal may be used. In this case the tube number containing the sleeve is ij
- = shall be recorded in the analyst final report.
Em ss Other mixes, including three channel mixes (turbo), may
'i be used in addition to those listed above for the purpose
;j of obtaining additional information or optimizing the gg sleeve examination.
y
-u 11.3.4 Voltage Normalization y
ic The voltage of all channels shall be normalized in H reference to the 250 kHz channel, separately for each ja coil set. The 100% TW sleeve flaw shall be set to 5 volts 33 and all other channels saved and stored. y ! 11.3.5 Strip Charts E! 1 v2 The vertical component of either a basic channel or a mix p for each coil set shall be monitored on the two long , n strip charts. I? Il ti 11.3.6 Calibration Curves l' 2: curves are necessary for crosswound
;i, e
- 10 calibration II analysis.
cz 22 83 11.3.7 Data Entries to Final Report ii
.4 The phase and amplitude of any indn.ation detected shall ij be compared to the calibration a standard flaw, then flaws the and if the indication
}; signal appears to represent I'
PAGE 23 OF 43 TD05 DATE: 04/10/94 CRYSTAL RIVER REV.: 1 UNIT #3 DWG.: 1217317A EDDY CURRENT DATA ANM.YSIS GUIDELINES
ev a :s m :3 a B&W NUCLEAR BWTECHNOLOGIES 1 Specsel Products & Intepreted Serdces detected shall be entered as 40% TW in the final report. 1 For each indication reported, " TUB" or "SLV" shall be entered in the comments field of the final report indicating the material containing the signal. Example of crosswound data entries are given below. 3 3; l[ Row Col Volt Deg %TW CH Location Extent
! SLV 14th TSP 3: 76 2 1.90 90 40 M2 UTE -1.30 ji 77 6 3.01 78 40 M1 15S TSP-5.00 SLV 14th TSP s
R' tl }} se
.1.3.5 Reporting criteria H
The following conditions shall be reported, as a minimum: All indications of sleeve or parent tube wall loss, !j j= regardless of depth. II=5 Any obstruction in the sleeve or parent tubing. Ij 11.4 Sleeve Bobbin Coil Examination 55 i$ jjs 11.4.1 Area of Interest
'lj, The bobbin coil areas of interest are the sleeve and j: parent tubing in the freespan (unrolled) portion of gi the sleeve.
il g' 11.4.2 Span and Rotation Settings j l si Es Set all differential channels with the 100% TW ljei sleeve flaw at 40 degrees plus or minus 5 degrees, with phase rotation starting down and to the right, l W? setting amplitude 50% full vertical screen height. El M Set all absolute channels with the 100% TW sleeve j[ flaw at 40 degrees plus or minus 5 degrees, with phase rotation starting up and to the left and 13
?? setting amplitude to 25% full vertical screen ij height.
se
- =
"i.
l' 11 ii TD05 PAGE 24 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
=.w :r: :n B&W NIJCLEAR BWTECHNOLOGWS
*;+#1 A+M & Int =7sted Swwcon 11.4.3 Mixes A 400/150 kHz differential mix This shall be mix established shall be for the T5P suppression.
accomplished by using the broached TSP in the calibration standard. Set the 100% TW sleeve flaw at 9; 40 degrees plus or minus 5 degrees, with phase (j; rotation starting down and to the right, setting the i amplitude to 50% full vertical screen height. j! 2: Additional mixes, including three channel mixes l obtain additional l ih (turbo), may be used to b information or optimize the sleeve examination.
'l
~. ; 1 11.4.4 Voltage Normalization sj 1-{
IE The voltage of all channels shall be normalized in is reference to the 400 kHz differential channel. The
!j j; broached 4 TSPpeak-to-peak, volts in the calibration savestandard and storeshallto be all is set to
$i other bobbin coil channels. l 13 EG 11.4.5 Stric Charts
-5 i
The charts use for the crosswound coils will In be theused case i unless a standard coil probes is being used. ll of case of standard bobbin, one differential and cne is$ s absolute channel with be displayed on the long strip lI charts. t~: j' 11.4.6 Calibration Curves c be set for the 400 kH: 5;T Calibration curves shall dif ferential channel and any other channel used to reccrd
!j a throughwall indication. A three point degree s calibration curve shall be set using the 100, 60 and 20%
h TW sleeve holes, using the as-built depths for the actual s? j! calibration values. An additional parent tubing 3 point phase angle calibration curve shall be made for any 23 I~ indication detected in the parent tubing.
;i fi
~3 11.4.7 Data Entries 22 Sleeve examination data entries shall be identical to the tubing examination data entries, with the exception that
!. }
P "TUS or "SLV" shall be entered in the comments field of jf the final report for any throughwall indications detected I' in the parent tubing or sleeve. PAGE 25 OF 43 TDOS CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 DWG.: 1217317A EDDY CURRENT DATA ANALYSIS GUIDELINES
sv. :r: u B&W NUCLEAR B TECHNOLOGIES R +s=I k n e e & InE+ M Bendone l 1 11.4.6 Recorting Criteria The following conditions shall be reported, as a minimum: All indications of sleeve or parent tube wall-loss, regardless of depth. Q'; tubing. I Any obstruction in the sleeve or parent 55 =x il = 3= is is
??
- s i;
c.
@E =t u ==
tr II li
;i is in i$
te
!?
11
=
58 55 ii
.a II
<=
$'i a
52
.s t=
si
;i
!?
is l
$U I si I si
. 4 li 'l s i PAGE 26 0F 43 TD05 DATE: 04/10/94 CRYSTAL RIVER REV.: 1 UNIT #3 DWG.: 1217317A 1
EDDY CURRENT DATA ANALYSIS GUIDELINES l
1 1 I s,w :s :a n 1 B&W NUCLEAR BWTECHNOLOGIES Specent Products & Insepreted Servicoe 1 I RPC GUIDELINES j APPENDIX A TABLE OF CCNTENTS l II I 1 il
- z Page 1.0 AREA 0F INTEREST 28 f:),
- i
- 2.0 ANALYSIS SET-UP 28 3-fj 2.1 Span and Rotation Settings for 28
- Basic Frequencies is 2.2 Mix 28 l ij 2.3 Filter 29 1 j; 2.4 Normalization 29 29 iz 2.5 Calibration Curves fi 2.6 Strip Charts 29
- i 2.7 Calibration Entries to Disk 29 2
E 30 jg 3.0 PLUG ANALYSIS 25 j~ 3.1 Rolled Plugs 30 30 ll 4.0 REPORTING CRITERIA !8 31 ai 5.0 INDICATION LENGTH AND WIDTH MEASUREMENTS l
=
- ' 5.1 RPC Clip Plot Measurements 31 Ej 5.2 Clip Plot Setup and Calibration Requirements 31 5.3 Reporting Clip Plot Measurements 32 V;
6.0 RECORDING CRITERIA 32 6.1 Axial Locations 32 l! 3; 6.2 Discontinuity Characterization Codes 33 !! 6.3 Wall Loss Indication 33 !! 6.4 Cbstructed Tubes 33 33 !! 6.5 Graphics Printouts ii
!! 7.0 DATA COMPARISON 34
- 2
'c 7.1 Resconsibilities 34 (m
7,2 Data Discrepancies 34 f 7.3 Interpretation Discrepancy Standard 34 TDOS PAGE 27 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT 43 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
l 1 wn:8m m B&W NUCLEAR , l BWTECHNOLOGIES Speciel haducts & Integrened *:-M 1.0 AREA OF INTEREST I The area of interest for all RPC examinations is the full extent of collected data. For rolled plugs, special emphasis will be on
. the full rolled area from the toe to the heel. The toe and the i; heel are two transitions of the rolled areas (See Attachment #6).
y The roll is approximately 1.25 inches longDue andtoisroller located movement, i; approximately .5 inch from the plug end. i ?! or re-rolling, the roll length may be greater than 1.25 inches, i j; and may extend to the plug end. ! i; l is 2.0 ANALYSIS SET-UP I! shall be identified by B&W Nuclear I j' The inspection frequencies fi Technologies Level III Eddy Current prior to inspection start up. , !j These frequencies are normally 300kHz, 200kHz, 100kHz, and 10kHz ! operating in the absolute mode. The 300 kHz absolute channel.shall l is jj be viewed as the primary reference frequency. j i is sr When a TSP is required for analysis set-up, the drilled TSP in the l fi calibraticn standard shall be used. If no TSP exists in the ji calibratio1 standard, then the signal to be used for mix suppression ; jg shall be determined by the lead analyst (B&W Nuclear Technologies). I sg The TSP and the tube number used in this instance shall be recorded l g! in the final report. I 15 2.1 Scan cnd Rotation Settings ig i E. ja set the 300, 200, and 100 kHz absolute channels so that probe 35 motion is horizontal and the initial trace movement of the 1001 i5 through-wall flaw is up, with the span set so that the smallest detectable calibration flaw is clearly visible on the screen. jlai ! Set the rotation of the trigger channel so that the signal is j;g going up and the small leg is horizontal. Adjust the span to 4 -i divisions. E? il 2.2 Mix s: !! A 300/100 kHz mix shall be established on process channel P1 as il the primary TSP suppression mix. This mix shall be accomplished d by using the drilled TSP in the calibration standard. Set the ji rotation so that probe motion is horizontal and the initial
!! trace movement of the 100% TW flaw is up. Set the span so that 12 the smallest detectable calibration flaw is clearly visible on (I the screen. Other mixes may be set-up at the analyst's !! discretion.
El TD05 PAGE 28 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
wc::ema 32 B&W NUCLEAR BWTECHNOLOGIES sp w prana. a s-:_ _:; ame 2.3 Filter A filter shall be established on process channel P2. The primary reference frequency pancake coil shall have applied a Band Pass filter with the following values: kr i 1. Sharpness - 23 j;; 2. Low Cut - 10
;! 3. High Cut - 100 h
ij 2.4 Normalization Z> II Using the 300 Kh: channel, set the voltage using the 100% TW
- s axial EDM notch in the calibration standard to ten (10) volts l} and save and store value all other peak-to-peak this to g; channels.
sh fj 2.5 Calibration curves
- =
!$ Wear shall be sized with the TSP mix using a 3 point ji voltage curve. These will be set up on a wear calibration 5 standard using the as-built depth values. Other voltage or ;jj phase curves may be set up at the analyst's discretion, kg 5 No calibration curves are required for plug examination.
vs ij VERT-MAX shall be used for the calibration and measurement o f
}8 wear indications.
Q 2.6 Strip Charts l'
-! For tube analysis, set the left strip chart to display the i 5 vertical component of Filter P2. Set the right strip chart to The l3 e;g display the vertical component of the 10 kHz channel.
analyst may adjust the strip charts at their discretion. h! For, plug analysis, set one strip chart to display the g! vertical component of the primary channel. The other 4 a ' jj chart may be set at the analyst's discretion. i.f 2.7 Calibration Entries to Disk 12
$j All calibrations shall be entered to the final report !! as a Row 999, col 999 entry. Calibration information (j shall be entered in the appropriate field as shown g below:
ii TDOS PAGE 29 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
i l SWNT4:87D1 3 94 \ 19111B&W NUCLEAR EiBWTECHNOLOGIES [ Spensel products a i .: . _: f SeMoss ROW COL VOLTS DEG iTW CH LOCATION EXTENT 999 999 Cal Cal Probe Tape cal Analyst ! Time Dia. No. Message Attachment #2 gives some examples of typical calibration j; entries. Ei j; 3.0 PLUG ANALYSIS l l l Ei 3.1 Rolled Plugs l \ - l !! Ii It is very important that the full extent of the plug be examined. For rolled plugs, this includes the entire if rolled area out to the open end of the plug. Attachment gj #6 displays a complete examination of a plug. A smooth
;; transition leading to the plug end (probe in air) signal s; must be seen. This verifies that the probe did not jerk. ?j out of the plug with the resultant loss of examination j; coverage near the plug end.
is jj 4.0 REPORTING CRITERIA
=5
! kj 4.1 All indications of tube wall degradation shall be reported. For
= plug analysis, all permeability indications shall be reported.
j$ Indications in the freespan area of the tuoing shall be recorded ll j 4.2 with the 300 kHz absolute channel whenever practical.
'g ja 4.3 Indications occurring within tube supports shall be recorded gj using the 300 Khz channel whenever practical.
t' j
*' 4.4 Indications occurring at tube support edges or otherwise Ej interfered with may be reported with the 300/100 kHz mix I
ls- channel. k! 4.5 All indications of tube wall degradation shall be reported with 0; a , characterization code in the percent column. The j! characterization codes to be used for reporting flaw indications 33 are SAI, MAI, SCI, MCI and VOL and are defined as follows: Ei il SAI, MAI - Single and Multiple axially oriented crack-like jj indications. Typically showing an enhanced response on the circumferential1y-wound coil. is l i,j SCI, MCI - Single and Multiple circumferentially oriented crack-like indications. Typically showing an l _!lm enhanced response on the axially-wound coil, i t' TD05 PAGE 30 0F 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
i . l 1 l 1 8 AY IC87Ci :3.94 l l i B&W NUCLEAR \ BWTECHNOLOGIES 8V+91 Products & integrated Semicoe typically showing nearly 70L - Volumetric indication on each of the coil equivalent response configurations. Wear indications shall be reported with the measured I; depth, in the %TW column, as determined f rom the wear curve set up. 53 11 should be determined through evaluation of
- =
Signal correlation {! 4.6 the phase rela,tionship noted among examination frequencies. is characterization should be determined through Indication 33 evaluation of signal amplitude and geometric relationships noted er among the various coil configurations. ti i;
% 5.0 I!iDICATICN LE!IGTH AND WIDTH MEASUREMENTS EE is 5.1 RPC Clip Plot Measurements P -I j;
RPC clip plot measurements will be performed on all bobbin coil is S/N indicat'.ons examined.
'i 5.1.1. The primary f requency of 300 kHz absolute will be used to extents of the size the axial and circumferential ji
- j indications.
s- l l 5.1.2 The setup and calibration requirements for reporting d indications are the same as those in Section 2.0. q ja 5.2 Clip Plot Setuo and Calibration Requirements ii 5.2.1 Af ter performing the basic setup select the "MRPC/CRKMAP" 35_
menu. Go to user select and set the tubing diameter to N
a=
.551".
le
*ng 5.2.2 Set the axial scale Refer in reference to the to the standard EDM calibration ECM calibration drawing Si standard.
for the standards total length. 0? H Select "MEASFLAW". Plot the 60% 0.D. EDM notch at 270.
?! 5.2.3 2 Position the threshold cursor just above tube noise.
;5 ft 5.2.4 Select " CLIP PLOT" function and plot the data at 0 11 degrees. " BOX ANGLE" must be kept at 0 degrees.
ij
!i 3j 5.2.5 Perform length and width measurements by drawing the box equivalent to the same size of the 60% OD EDM notch signal. Af ter the measurement is performed, move the box l'!l*
! just below the signal.
PAGE 31 OF 43 TDOS CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 DWG.: 1217317A EDDY CURRENT DATA ANALYSIS GUIDELINES
ew i:r:.1 3u B&W NUCLEAR BWTECHNOLOGIES speedet 7 ;is= A M_,, _:2 Sandses 5.2.6 Verify that the total length and width measurement is ! equivalent or greater than the as-built length and width , of the 60% OD EDM notch. If the measurement is undersized reset the axial scale. li 5.2.7 When plotting the data, set axial scale to .86" +/ .20".
$5 ;; 5.3 Reporting Clip Plot Measurements if $i 5.3.1 Select the " REPORT ENTRY" menu and enter the length and 5; width measurement to the final report. See Attachment 10 j;
2 for the final report entry. ll 5.3.2 Two graphics are required for the clip plot measurements. f; The first graphic will display the normal CSCAN plot and
!! the second graphic will display the clip plot. This will si be performed for each individual indication as well as j;
clustered indications. Appendix 1 of the analyst station reference book provides examples of the required graphics is for the normal CSCAN and clip plot measurements. si [] 6.0 RECORDING CRITERIA il 6.1 Axial Locations id i All measurements shall be made using the following j criteria:
?
jE
- An indication location shall be measured from the :
d center of TSP or a tubesheet edge to the center of the indication being reported. I
.i!.
E'i
- Axial indications shall be measured from indication f; edge-to-edge (for example: LTSF +12.10 To 14. 60) .
if
*i Set the axial scale based on known locations in !? -
the steam generator or use calibration standard il defects with distances documented on as-built
!! drawings. ?!
Positive direction is physically upwards in the ji generator (i.e., 1st TSP + 1.00 inches is 1 inch sj above the 1st TSP). H Ej
- Measurements may be made in either the positive or negative direction using the nearest available ll g landmark.
TD05 PAGE 32 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 t EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
sec ::am: 3u B&W NUCLEAR BWTECHNOLOGIES I Mdm & Integraced Bankee
- Wear at TS?'s shall always be recorded as
" location + 0.00".
Plug indications shall always be located from thedependin tube end (UTPE or LTPF) 0; Extent will be top of tubesheet (UTSF or LTSF) depending en location of plug. N
!?
6.2 Discontinuity Characterization Codes
?!
Three digit codes used toetc.) further characterize be enteredthe i; discontinuity type (W AR , shall in the 22 last 3 spaces location field in the final
!! of theThese types of codes can be found in ji report.
Attachment 44.
"1
- 4
~
Wall-Loss Indications i'
~:
6.3 ij j; 6.3.1 Freespan Indications is All calls in the freespan area of the tubing shall be ji recorded with the primary frequency.
;j il 6.3.2 TSP Indications
, ji 48 TSP indications can be called with a mix or primary
!$ frequencies, whichever gives the best representation.
~~~~
5) 2. 6.3.3 Plug Indications j8 2, All indications in plugs shall be recorded. Plugs shall i' be analyzed using the primary frequency. s' ! 51
!j Cbstructed Tubes 6.4 1 i= obstructed tubes shall be reported as in section 8.0 of
-i 5?
the bobbin guidelines. 1 g1 1 6.5 Graphics Printouts
?!
2: i shall be responsible for printing
!3 The primary analystPictures shall be made for all degradation
' graphics.
! calls.
)I I I; i 6.5.1 MRPC s_'t.
- For each flaw, four (4) graphics are required.
PAGE 33 OF 43 TD05 DATE: 04/10/94 CRYSTAL RIVER REV.: 1 UNIT #3 DWG.: 1217317A EDDY CURRENT DATA ANALYSIS GUIDELINES
s w .:s ; <. u l B&W NUCLEAR 1 BWTECHNOLOGIES sp.aw proeces a :.v:M smem. l The first picture shall be of the X-Y lissajous with phase, amplitude and field code edited in i the "%TW" column. For the second picture, a l terrain plot shall be generated using the same j data channel as in picture 1. The third picture i
!; will be a terrain plot of the axial coil. The ,
l fj fourth picture will be a terrain plot of the is circumferential coil. Y1 ji 7.0 DATA COMPARISON . ~s; is 7.1 Responsibilities
'l j! The primary analyst shall generate the data to be used gj in the final report. This analyst is responsible for ;; recording all indications reportable by the analysis jg procedure.
II j; The secondary analyst shall generate the comparison data, um This analyst is responsible for recording all tube wall Sj indications reportable by the analysis procedure.
=3 'j .g 7.2 Data Discrepancies 23 The basis for the data comparison shall be the Interpreta-j* tion Discrepancy Standard identified in ptragraph 6.3. All j identified differences in data interpretation shall be y, reviewed by the Senior or Lead analyst to arrive at the
, jg final interpretation. ll The optical disk containing both the primary and
-' secondary analysis is loaded into the resolution !! program for comparison. A record of all primary and secondary data, and any changes to those results
{r e through the resolution process is maintained on the
};j optical disk.
12 ll 7.3 Int'erpretation Discrepancy Standard 15 Signals indicative of tube wall degradation wear shall j! i be resolved if any of the following criteria are met: 11 i
- The indication has been recorded by only one j!! analyst.
n is gg The through-wall dimension of one of the _t interpretations is equal to or greater than 40%, s' and the other interpretation is less than 40%. TD05 PAGE 34 0F 4 3 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
l l l l h et S a J"e -
~ -
l B5W NUCLEAR BWTECHNOLOGIES speedst A 29 a ..: . J " SeMoos i l
\
The through-wall dimension of one of the and the other interpretation is less han than 2 The through-wall measurements differ by more t 10%. ig Si
- The voltage differs by more than 1 volt.
j; 23
- The axial location differs by more than 1 inch.
ji to Any of the following conditions are also subject _!! resolution: Il
!I
- Tube not entered by both analysts.
sj , cr
- Extents tested do not match. j i!
fj
- Mismatching discontinuity characterization codes j;ss (WAR vs . ODI, for example).
J
*i
- Rerun code vs. no rerun code. j
;s i.
f5
- Different inspection legs specified.
ig i15 se i
!lIs
<=!
Ih li c' 3! I 1;
}]
ii ti
! ?
I.i is si gf 11 is PAGE 35 or 43 DATE: 04/10/94 TD05 CRYSTAL RIVER REV.: 1 UNIT #3 DWG.: 1217317A EDDY CURRENT DATA ANALYSIS GUIDELINES l
BW: CUM :3 94 B&W NUCLEAR BWTECHNOLOGIES Spacesi Aroducts a f.1 _1f inte j ATTACHMENT #1 OTSG ELEVA TION MAP xx l 46.375" l j; ii 15S l i~ 35.00" \ ij* 14S *** TUBE DATA *** ! 36.00" NO. OF TUBES = 15531 i$ 13S MATERIAL = INCONEL 600 $i 37.00" ji 12S NOMINAL DIA. = 0.625' ij 38.00" NOMINAL WALL = 0.034' !$ TUBE LENGTH = 673.375' l 36.00', l gl 10S V 40.00" jg3 09S *** SUPPORT DATA *** <5 39.00" HOLE TYPES = DRILLED & l 08S BROACHED i'f i 40.00" j; 07S MATERIAL = CARBON STEEL g 39.00" THICKNESS = 1.50" g; --- 06S ll 37.00" 05S g2 d 39.00" i! 40.00" 04S
\
l5 i! 03S l
}t 39.00"
- i 02S ll 38.00"
;; 01S si 46.00" LTS LTE TD05 PAGE 36 or 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
1 E w - r. g.: 1 B&W NUCLEAR BWTECHNOLOGIES l Special Products & Integrated Berunne ATTACHMENT #2 FORMAT FOR ENTERING CAL RECORDS AND OTHER DATA $; I $ CAL PROBE CAL ANALYST l jj TIME
- CAL' SIZE NO. ' INITIAL (OR FINAL) CAL' CODE E! l
!? SG ROW COL VOLTS DEG %TW CH# LOCATION EXTENT l ii !? A 999 999 1610 CAL 510 015 INITI AL CAL X1234
- f
$3 A 33 104 MSG SEE CAL 61 i; h! A 24 92 UTELTE UI si A 46 55 1.01 150 18 M1 15S + 0.00 WAR UTELTE im l 'i
- j A 77 5 2.61 101 45 M1 UTS + 0.00 MSM LITELTE l 4
; l j]g A 77 5 RPC UTS + 0.00 UTELTE l f:
!! A 999 999 1825 CAL 510 015 CAL OUT OLD PROBE X1234 l kk l 5E A 999 999 1908 CAL 510 015 NEW PROBE CAL X1234 ? l n. 53 A 41 42 1.14 97 34 1 02S + 18.87 TO31.8 AXl UTELTE hh l l; A 66 3 ROB 02 S + 18.00 03S p! ! A 66 3 MSG RERUN WITH .480 PRODE 03S Si $! A 999 999 1929 CAL 510 015 FINAL CAL X1234 5!
- 5 A 888 888 CAL NO FINAL CAL DATA OK X1234
*I
$2 A 888 888 CAL NO FINAL CAL PROBE DIED X1234 ii 5'I it li TDOS PAGE 37 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
1 1 e w ::six 3 9 B&W NUCLEAR BWTECHNOLOGIES speew prassase a:,: . _:=i s m sme l ATTACFMENT #3
. CCcE cESCRIPTION
... .... ................................. 1
.. CDI CU*ER DIAMETER (GENEPAL) I
,g 2. !DI !NNER OIAMETER (GENERAI.) l t2 3. AXI AX:AL INDICATICN '
i
;E 4. CCL CIRCLMFERENTIAL (CRACK LDT) $$ 5. ;GR WEAR 53 6, PIT PITTING t-AOS ABSOLUTE ORIF2 S!GNAL t5 s. BLG BULGE I
_ 9. Otr" OENT '
!* 10 ONG DING 3[ 11 CSI DISTCRTED SUPPCRT IND f~;i 12.
13. ICR MSM INCCHPLETE ROLL MANUF. BUFF MARK
- 14. CTI DISTCRTED TSH IND 53 *S. DISTCRTED SUPPCRT SIG?RL
' s= . OSS j[ 16. IRR !RRIGULAR ROLL is 17 OTS DISTCRTED TSH SIGNAL i& 13. NCI NON-QUANTIFIABLE IND l' li 19. NOS NON-QUANTIFIABLE SIGNA 1.
- 20. NO EXPANSION
~{: 21 NEX CHT CHATTER
- f2 22. CCP COPPER CEPOSIT 22 23. CSP CRACKED SUPPORT PLATE fi 24. CST CISTCRTED SIGNAI. l f- 25 GMD GECMETRIC CISTCRTION l if 26, LCl LTS C1 INDICATICN q 2'. LC2 LTS C2 INDICATION 5 20. LCB LTS C3 (BANANA)
! 29. LPS LOCPS -f" c
c 30 31 NOD CBS NC CETECTABLE CEGRA0ATION CBSTRUCTED 35 32. PFM PEFMEABILITY VARIATION
- 33. MAI MULTIPLE AXIAL IND
- 34. MCI MULTIPLE CIRCUMFERENTIAL IND
#h 35. SAI $!NGLE AXIAL IND Is ~
- 36. SCI SINGLE CIRCUMFEFINTIAL !ND
!g* 37 S/N S!CNAI.-TO-NOISE 2? 30. SLG SLUDGE CEPTH 2 39. MSG ANALYST MESSAGE fj 40. UCl U*S C1 INDICATION q, 41 UC2 UTS C2 INOICATICN 59" 42. UC3 UTS C3 INDICATION
- 43. UOS UNOEFINED SIGNAL v j 44.
45. PID PLP POSITIVE ICENTIFICATICN PCSSIBLE LOCSE PART g 3 46. PVN PEPMEASILITY VARIATICN 5 47 IDC ID CHATTER T 48. INF IN0! CATION NOT FOUND aj 49. INR INOICATION NOT REPCRTABLE gI 50. VCL VCLLMETRIC - 3CRPC
!! 51. F30 PITEST - BAD OATA
- f 52. R FX RETEST - FIXTUPI
$; $3. RIC RETEST - INCCHPLETE if 54.
55. RCL RNF RETEST - CLARIFICATION RETEST - INDICATION NOT FOUND
- 56. RCB RITEST - CBSTRUCTED FITEST - POSITIVE ID i; $7 RPI jr 59. RNT FITEST - TUBE NOT RUN t
~
5i. RNC RETEST - TUBE NLMBER CHECK I= 60. RTR RETEST - RESTRICTED is
- 61. RPC RETEST - RPC EXAH REQUESTED if
.if TCOS PAGE 38 0F 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
swN4carc.i 3 94 B&W NUCLEAR BWTECHNOLOGIES ' speaw w-~ a w ; _x smkme , j l ) ATTACHMENT #4
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stu ! !' u a ((l 8' I" l E : E 1 i sl c_ 8i t ! si o C:" x,B,ti , cn PAGE 39 OF 43 TD05 04/10/94 CRYSTAL RIVER DATE: UNIT #3 REV.: 1 DWG.: 1217317A EDDY CURRENT DATA ANALYSIS GUIDELINES
a,w :s5: 39 B&W NUCLEAR BWTECHNOLOGIES
*;+:M 7,-:M & W %~~M l
l ATTACHMENT #5 l Vs Vs - Signal Voltage Vr - Noise / Residual Voltage S/N = W lg Determinino S/N Ratio Usino Multicarameter or Comouterized Analysis li Analyzed Indication Composite indication & TSP }l D i-U b r 0 x Vs j$
- =
\ l !YE fi_
Clean TSP Residual (analyzed) Clean TSP _13 I il 5l Ge l 31 i!is v v - > 4--- l V' EE li*I 5 Determinino S/N Ratic Usina a Sinale Frecuency Techniaue
.! Composite Indication & Chatter Noise 3,
a vr 4 F ij c a-ti
, , hl 41 Vs
!I"! \
58 PAGE 40 OF 43 TD05 '- DATE: 04/10/94 CRYSTAL RIVER UNIT #3 REV.: 1 DWG.: 1217317A EDDY CURRENT DATA ANALYSIS GUIDELINES
eer 1:a t-; 191 B&W NUCLEAR BWTECHNOLOGIES : ; s.ne sp w A e a R. l ATTACHMENT #6
... tes 2 ( l pilj ss scnu- za.2 vit lllll j) a...< }rplp , ,
ss e st iss ... 2*m i ....! '5
'ii LU).[...c.5".T .
" 2'2 ""*
I! b llllhIII NOISE R3T ATE 3
!i o f,,
HORIZONTAL
' HEEt,-
M I
, circ ued.,s.t i al
}3 , ,
32 b h 3.98 volt . ..
- TOE q
I? s
#1 fachh hf '
3EE e.12 f 27s y PLUG.ENO e,57 III 1.55 f sa
. 2.22 12 deer un jl ...,i.,,....
LISS SCBM 25.2 vit raw 18S tel 82 Pt.1E f#g Oaa.el 61 v.,tical- les kha LISS M 5E 175 des j IM22CRTION 1.34 volta at 1.551.ches 285 degree s g, _ _ _ s Is HolSE F3T ATE: i HORIZONTA' 5I . .,. ew . lj
..t i u
=g i
!; AIR E? HEEL l[ TOE jj 5$**118 ACLL AAEA PLUG ENO N
!h 84 -
.=
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'S 1.. . , i a, : ,. .r.
PAGE 41 0F 43 TDOS DATE: 04/10/94 CRYSTAL RIVER REV.: 1 UNIT #3 DWG.: 1217317A
- - - DHY CURRENT DATA ANALYSIS GUIDELINES
unsm :m l B&W NUCLEAR BWTECHNOLOGIES l Spesist Awduces a hrespreeed SerWoes ATTACHMENT #7 li !i tu5e sheet lower d_ peaks Win = 1 volts >0.60 <1000.00 H ChaE=20 volts >0.60 <200.00 r $! Chan-17 t amp _vpp Win =120 H Chan=17 E amp mr Win =120 angle >30 <170 r 3- Chan=17 max rate Win = 20 flaw >l <100 r Chan=17 t_ amp _mr Win =120 (19] angle >35 <160 ' !q! Chan=17 t amp mr Win =120 (3) angle >35 <150 Chan= 8 aKywhare Win =120 loc > TOP SAMP +1.00 <BTM SAMP +1.00 [" Chan=17 t_ amp _mr Win =120 [5] angle >35 <150 g j, tv tube supports jj Chan=20 Chan=17 d_ peaks Win = 1 t_ amp _ar Win =120 volts >0.75 <1000.00 volts >0.75 <200.00 r eg angle >30 <170 r i 3, Chan=17 t_ amp _,mr Win =120 j5 Chan=17 t_, amp _mr Win =120 [3) angle >35 <160 l zg Chan= 8 anywhere Win =120 loc > TANG-E -36.00 <IOP SAMP +36.00
;g Chan=17 t_ amp _mr Win =120 (19) angle >35 <160 p Chan= 8 vert _, max Win = 40 volts >10.00 <1000.00 =5 free-spen volts >0.40 <1000.00 l d peaks Win = 1 lll= Chan=20 Chan= 1 t_ amp _mr Win =120 volts >0.40 <200.00 r Chan= 1 t_, amp _mr Win =120 angle >35 <170 r 3
jg Chan= 1 t_ amp _mr Win =120 (3) angle >35 <140 Chan= 8 anywhere Win =120 loc > TANG-E +1.00 < TOP SAMP -1.00 g{. Chan= 1 t_ amp _mr Win =120 (5) angle >35 <115 {5 2 Chan= 8 vert max Win = 40 volts >0.00 <10.00 i' tube _ sheet _ upper y Chan=20 d_ peaks Win- 5 volts >0.60 <1000.00 Chan=17 t_ amp _,ar Win =120 volts >0.60 <200.00 r , 03 angle >30 <170 r i gg Chan=17 t_ amp _,ar Win =120 eg Chan=17 max rate Win = 20 flaw >l <100 r 3; Chan=17 max [rateWin=120 (19] angle >35 <160 lg Chan=17 t_ amp _,ar Win =120 [3) angle >35 <150 ja Chan= 8' anywhere Win =120 loc >AV1 -1. 00 < TANG-E -1. 00 d Chan=17 t_, amp _mr Win =120 (5) angle >35 <150 H 55
-t 55 55 ss k$
I"! s' TD05 PAGE 42 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
sw :src; 2 w B&W NUCLEAR BWTECHNOLOGIE8 speedet";;_ M e a AE . _^ " Seredese 1 ATTACFMENT #8 I; i$
- s-
=
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(" 21 ii TD05 PAGE 43 OF 43 CRYSTAL RIVER DATE: 04/10/94 UNIT #3 REV.: 1 EDDY CURRENT DATA ANALYSIS GUIDELINES DWG.: 1217317A
4 M i d APPENDIX H SIGNAL TO NOISE RATIO SIGNIFICANCE l 1
I l 1 l SIGNAL TO NOISE RATIO DISCUSSION The eddy current defect signal is directly related to the probe coil's total opposition to current flow or impedance (Z). The impedance of the circuit is determinedFigure by the inductive reactance one illustrates this (X t ) and the coil's resistance (R). relationship and how vector mechanics is used toofdetermine the The phase angle a bobbin coil phase angle of a defect signal. traditionally been used to estimate the eddy current signal has Typical percent through wall penetration of the defect. calibration standards correlate a 100% through wall indication to a 40* phase angle. A 40% through wall indication is typically correlated to a 130 phase angle for a 600 kHz inspection f requency. Signal to noise ratio is the ratio of the magnitude of the signal of interest (defect signal) to the _ magnitude of Theany undesirable attached figure extraneous signal which occurs simultaneously. 2 provides a vector mechanics illustration of how the vector produced by noise interf eres with the defect signal vector and can' cause an increase in the error angle with respect to the resultant signal. I Figure 3 provides a correlation between errorAsangle shownas on afigure result 3, of l noise and the defect signal to noise ratio. establishing a 5:1 minimum ratio as the cutof f at which above phase angle calls are made based on eddy current signals ensures that the error angle af f ecting the def ect signal is below 10'such that error in estimation of percent through wall is less than 10%.
1 l l j VECTOR SECHANICS ILLUSTRATION OF HOW i A PHASE ANGLE IS DETERMINED FOR A DEFE ! l l l L
...... .. l i
t { i I i h y R r = Defect Signal (Impedance -(Z) ) XL = Inductive Reactance R = Resistance 0 = Phase Angle r= X i,2 + R' W = tan'3 (X/R) t FIGURE 1 l
Vector Mechanics Illustration of How Noise Signal Vector (ar; Interferes with Defect Signal Vector (r) Producing Resultant Signal [ri Ar _ _ _ ___ 7 __ _ _
\
\
\ 180-0
\
I
\
\ r1
\
\
\ g
\
\
\ 0 ~
\
\ P r = Original defect signal Ar a r = Noise signal 0 = Angle between defect signal and noise signal a = Change in phase (Error angle) r1 = Resultant signal __ ___________ -___ -____ _ _ _____
i Error Angle vs Signal to Noise Ratio for Different Values of 0 l~ + for 0 = 170* a for 0 = 140'
- for 0 = 110' 50 - a for 0 = 90* -
o for 0 = 70* l x for 0 = 40' 2 e for 0 = 10* 40 o{ a d h 30 - l I E 5 x 20 -\X 0
~~
i '- 15
~ n* a 20 J
25 5 10 0 Signal to Noise Ratio ,}}