ML20234D512
| ML20234D512 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Haddam Neck, 05000000 |
| Issue date: | 06/17/1987 |
| From: | Leason J NORTHEAST UTILITIES |
| To: | |
| Shared Package | |
| ML20234D443 | List: |
| References | |
| NU-UT-1, NUDOCS 8709220113 | |
| Download: ML20234D512 (42) | |
Text
_ _ _ _ _ _ _ _ _ _ _ _ - - _ -
Ultrasonic Exa.mination Procedure For General Requirements Northeast Utilities Approval Concurrence Compliance Revision /Date NUSCO Level III/Date Manager QA/Date A.I.A.
Date 0 4/11/79 J. M. Stankoski 4/11/79 Verified by P. D. Watson H.S.B. 3/18/81 1 4/23/79 J. M. Stankoski 4/23/79 Verified by P. M. Austin H.S.B. 3/18/81 2 3/18/81 J. M. Stankoski 6/17/81 D. C. Diedrich 8/27/81 H.S.B. 9/22/81 3 12/13/82 J. M. Stankoski 1/4/83 D. C. Diedrick 1/4/83 H.S.B. 1/4/83 4 3/16/84 J. M. Stank,oski 4/7/84 D. O. Nordquist 4/10/84 H.S.B. 4/2/84 5 7/10/86 h
- < # 7I/h % 0 M h M b ## # ~ 'A'#'
6 1/6/87 *b
' WUZY I W
^'C Always verify witi NDE Procedure Status Log before using this procedure.
8709220113 870911 I PDR ADOCK 050 3
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+
Procedure NU-UT-1
1
)
O NORTHEAST UTILITIES l
l NDE PROCEDURE
-MILLSTONE STATION APPROVALS
'?
. O!
APPLICABILITY UNIT 1 X
UNIT 2 ' M-UNIT 3
-]
PROCEDURE NUMBER A'D-t ir - I f
REVISION h
i.
TITLE C F tv FR A L
/4 F G)oill E /v) E >uT 9
~UY I
l 218 7 L
REVIEWED BY e
UNIT 1 ISI COORDINATOR DATE I
REVIEWED BY
/
6
@ T/
~
' ' ' UNIT 2 ISI CDURDINATOR DATE 5/2.2 M [
REVIEWED BY u
Q UNIT 3 ISI COORDINATOR DATE id C
REVIEWED BY T D
/h j
Nj.
/QF' DATE PORC/SORC MEETING NO.
t;;" "i"A M w/w :l h 44 @
UNIT / STATION SUPERINTENDENT DATE I
1 1
I o
)'
ULTRASONIC EXAMINATION CENERAL REQUIREMENTS 1.
~ SCOPE 1.
This procedureLdetails the. general requirements for ultrasonic examination.
2.
These requirements shall'be considered a part of a specific 0
l ultrasonic procedure where referenced.. All.the' requirements.
]
specified herein shall be complied with'unless otherwise stated.
within a specific procedure.
3.
This procedure cannot be used for ultrasonic examination in itself.
Specific procedures are written for each area.of examination and are to be used in conjunction with this general requirement procedure. Included in the specific procedures lwill be " Technique l
Sheets," when applicable, that'shall cover. unique examinations..
I Calibration blocks for each specific' veld'to be' examined are. listed I
in Appendix A of the NDF Procedures Manual.
2.
REFERENCES 1.
'The American Society for Nondestructive Testing, SNT-TC-1A,;1980
/ki j
Edition.
]
2.
NU-UT-4, Procedure for Weld Marking Datum Points and Identification.
3.
Appendix A (NDE Procedures Manual), Calibration Blocks.
4.
ASME Section V, Articles 4 and 5, " Ultrasonic Examination,"
1980 Edition, up to and including the Winter of 1980 Addenda.
5.
ASME Section XI, Each individual plant complies to a different year.
of the code:
]
Plant Year Millstone Point Unit One 1980 Edition, Winter of 1980 Addenda Millstone Point Unit Two 1980 Edition, Winter of 1981 Addenda-Millstone Point Unit Three' 1983 Edition Summer of 1983 Addenda l
Connecticut Yankee 1980 Edition, Winter of.1980 Addenda.
3.
PERSONNEL AND MATERIAL REQUIREMENTS 1.
Personnel shall be certified in accordance with paragraphs 2.1 and jji 2.5 above. At least one member of an ultrasonic examination team' l
shall be certified to at least Level II.
A copy of;the examiner's certification summary and a current, eye test'as required by:SNT-TC-IA shall be submitted to the plant ~ owner or his agent, prior.to performing examinations.
l Rev.;
6 Date:.1/8/87-Procedure NU-UT-1 Page:
1'of 21 l
i u_________________.._
l 2.
The couplant shall be certified to contain less than 1% by weight of total residual halogens and less than 1% by weight of total sulphur.
The couplant shall be supplied in clean containers of sufficient quantity for performance of the examination.
3.
The search unit cable may be Microdot, Lemo, or BNC of'any
/hi convenient length or combination of lengths. Record actual length used on the Calibration Data Sheet.
4.
When water is used as a couplant, the water shall be demineralized
}
vater.
4.
ULTRASONIC EQUIPMENT REQUIREMENTS 1.
A pulse echo type ultrasonic flaw detection instrument shall be used. The instrument shall be equipped with a stepped gain control calibrated in units of 2dB or less, or fine adjustments of at least 2dB or less.
2.
Complete instrument linearity checks shall be performed at the beginning of each period of extended use or every three (3) months, whichever is less, in accordance with the technique referenced below:
NOTE:
Record all readings on the Ultrasonic Instrument j'/
Linearity Record (Figure 11).
F
A.
Horizontal linearity shall be verified using a 2.25 MBz straight beam search unit, and the side of an IIW block (or 1" Block) as follows:
1.
Place the search unit on the block and adjust the instrument controls to obtain clear multiple back surface reflections.
2.
Adjust the " delay" control to align the first back reflection with the number 1 CRT graticule.
3.
Adjust the " material calibration" (fine range) control to align the leading edge of the tenth multiple back surface signal with the number 10 CRT graticule.
4 Repeat steps 2 and 3 until the first received signal is aligned at one and the tenth is aligned at 10.
5.
Record the position of the leading edge of each multiple back surface signal.
6.
To be considered acceptable, signals would coincide with each of the ten marked divisions on the CRT within 2 5%.
Rev.:
6 Date:
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2 of 21
s
'l s
B.
Vertical linearity shal] be verified using a 2.25 MHz straight g
beam
(=. 75") or angle beam (any convenient' size) and an IIW j
Block as follows:
{
1.
. Position a search unit (angle beam or straight beam) so that signals can be observed from any two reflectors.
t 2.
Adjust the search unit position to display a 2 to I ratio 0]
of amp 1f tudes between the two signals, with the larger at 80% FSH.
j 3.
Without moving the search unit,' adjust sensitivity (GAIN)
- i to successively set the larger signal from 100% to 20% of FSH, in 10% increments (or in 2dB steps if a fine gain i
control is not available).
j 1
4 Record the amplitudes of'both signals at each increment 1
(ten points in all).
5.
The smaller signal amplitude should be equal to half that of each corresponding larger signal amplitude within t 5%
of FSH to be linear.
l C.
The accuracy of the calibrated amplitude control (Amplitude l
Control Linearity) in the ultrasonic instrument may be l'
verified as follows:
"~
3 l
]
l 1.
With the ultrasonic examination system unchanged from the l
setup in 2, set any signal to 80% of FSH.
2.
Decrease amplitude by 6dB, the signal should drop to between 32% and 48% of FSH.
3.
Decrease amplitude by an additional 6dB, the signal should now drop to between 16% and 247 of FSH.
l 4.
Now set the same (or any other) signal to 40% of FSH.
5.
Increase amplitude by 6dB, the signal should now rise to between 64% and 96% of FSH.
6.
Now set the same (or any other) signal to 20% of FSH.
7.
Increase amplitude by 12dB. The signal 6hould again rise to between 64% and 96% of FSH.
8.
Record all the signal responses.
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6 Date:
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3.
.During examinations a daily check of the. instrument vertical and amplitude control linearity shall be performed in accordance with Items 2 and 3 above. All readings shall be recorded on the Calibration l
Data Sheet (Figure 6),
j
)
4.
Should the instrument be nonlinear, it shall be tagged'and not J
used.
Instruments faf',ing to meet the preceding calibration checks l
shall be sent out for calibration.
Calibration of instruments on a rl yearly basis is recommended. All examinations which were performed with that instrument since the previous valid-linearity check shall be identified in writing to a Level III for disposition. The l
Level III disposition shall become a part of the permanent record.
]
5.
The nominal examination frequency should be 2.25 MHz unless j
otherwise specified within the specific examination procedure, j
6.
Other frequencies may be used if such variables as material' I
attenuation, grain structure, etc., necessitate their use to achieve penetration or resolution.
This information shall be
]
recorded in the data sheets.
q l
5.
EXAMINATION SYSTEM CALIBRATION i
l 5.1 Calibration shall include the complete ultrasonic examination i
system. Any thange in search units, shoes, couplants, cables, ultrasonic instruments, personnel, recording devices, or any other C
j parts of the examination system shall be cause for calibration i
check. The original and final calibration must be performed on the
.l basic calibration block.
Intermediate calibration checks may be performed on a calibration block simulator, but must include a check of the entire examination system.
~
5.2 Ultrasonic instrument calibratfor; consists of two basic steps, metal path and sensitivity.
i A.
Refer to Figure 1 for appropriate metal path calibration that.
l coincides with the examination requirements; such as examination angle, material thickness, and vee path.
B.
Vertical instrument sensitivity is established by obtaining reflections from the side drilled holes or notches, or both, located in the code calibration block.
5.3 POSITION AND BEAM SPREAD CALIBRATION TECHNIQUE - VESSELS dd 1.
Angle beam position calibration and beam spread calibration shall be performed as follows.
Rev.:
6 Date:
1/8/87 Procedure NU-UT-1 Page:
4 of 21 ~
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a A.
Position search unit to obtain peak indication'from the g
1/4T hole. Measure the distance from the search unit (wedge) exit' point to the scribe line on the calibration block.
B.
Increase the instrument sensitivity 2X over reference sensitivity and move-the sea'rch unit toward the 1/4T hole a
until the signal amplitude is equal to the DAC curve as drawn on the screen. Measure the distance from the search unit exit point to the scribe line on the calibration block.
C.
Move'the search unit away from the 1/4T hole until the signal amplitude is equal to the DAC curve as drawn on the screen. Measure the distance from the search unit exit point to the scribe line on the calibration block.
D.
Decreare the instrument sensitivity to the reference sensitivity level and repeat Steps A, B and C for the 1/2T and 3/4T ho'les.
NOTE:
The above requirement need only be performed once for.each sequential series of examinations using the same transducer / wedge / calibration block combination.
E.
Record all information on the Position Calibration / Beam g
Spread Supplement Sheet (Figure 10).
5.4 CALIBRATION CHFCKS 1.
A system calibration check shall verify the DAC curve and the sweep range calibration at the start and finish of each examination, with any change in personnel, transducers, cables, shoes, batteries, couplants, and at least every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> during an examination.
Calibration checks shall be performed as.follows and these calibration checks shall be d
recorded on the Ultrasonic Data Sheet (Figure 6).
A.
Adjust the sensitivity control settings to match those recorded for the calibrated reference sensitivity.
B.
Reposition search unit at each respective calibration hole or notch and observe maximum signal response amplitudes and horizontal screen positions.
2.
During examinations, if any point on the DAC curve has decreased 20% or 2dB of its amplitude, all data sheets since the last calibration check shall be marked void. A new calibration shall be made and recorded and the voided Rev.:
6 Date:
1/8/87 Procedure NU-UT-1 Page:
5 of 21
7
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1 i
examination. areas reexamined.
If.any point ot. the DAC
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curve has. increased more 'than 20% or 2dB' of its,wp11tude, only recorded indications taken since the last vald
]
calibration or calibration check need be reexamined v.'h-1 the correct calibration and their values changed on the data skets.
3.
If any point on the DAC curve has moved on'the sweep line more than 5% (10% if examination conducted-on piping) of the sweep division reading, correct the sweep range calibration and note the correction in the examination record.
If recordable reflectors are noted on the data sheets, those data sheets shall be voided, a new calibration shall be recorded, and the voided examination shall be repeated.
j 5.5 Speciffe details for the system calibration and calibration block j
requirements are included in the specific application procedures.-
1 5.6 The temperature of the calibration block shall.be within 25'F of the component temperature. Ca11bration' block temperature shall be M
recorded on the Ultrasonic Calibration Data Sheet (Figure 6), and the component temperature shall be recorded on the Ultrasonic Examination Data Sheet (Figure 7).
5.7 The identity of the calibration block used for performing y,
calibration shall be recorded on each Ultrasonic Calibration Data
)
Sheet (Figure 6).
l 5.8 Prior to examinations, the examiner shall verify the sound exit point of the transducer.
5.9 Prior to examinations, the examiner shnIl verify the refracted h
angle produced by the wedge as measured on the 11W block. The rafracted angle shall be within 22* for vedge angles up to 50' inclusive, and t4' for anF es greater than 50'.
l 6.
SURFACE PREPARATION 1.
The examination surface shall be free of irregularities loose foreign matter, or coatinFs whi;h interfere with ultrasonic wave transmission. Where the surface or other conditions do not permit a meaningful examination, the examiner shall report the location and d
comments on the particular interfering condition in the comments space provided on the Ultrasonic' Examination Data Sheet (Figure 7),
and report same to the examination supervisor for corrective action or disposition.
2.
The weld crown shall be sufficiently smooth to permit proper 1
transmission of the sound beam as determined by the Examination Supervisor.
-Rev.:
6 Date:
1/8/87 Procedure NU-UT-1 Page:
6 of 21
.)
l 3.
Unacceptable surface conditions shall be referred to the plant P
owner for disposition.
7.
EXAMINATION VOLUME AND COVERAGE The examination volume is defined in paragraph 7.1 through 7.4 and in each specific examination procedure. Detailed sketches (Technique Sheets) will be included within each specific procedure to cover each ht unique examination.
7.1 VESSEL WELDS The examination volume shall include the veld metal and the adjoining f
base material for 1/2T beyond the edge of the veld. During the I
examinations of the vessel welds', wherever feasible, the scanning of the examination volume shall be carried out from both sides of the j
veld and on the veld crown.
Any areas not scanned shall be
/h\\'
f described in detail in the comments section of the Ultrasonic Exam--
ination Data Sheet (Figure 7).
The examination volume shall be scanned by angle beams, both directed at right angles to the weld axis and along the weld axis in two directions. A straight beam examination of the base material through which the angle beams will travel, is reautred, if an initial baseline examination has not been performed.
h 7.2 PIPING WELDS The examination volume shall include the veld metal and thread-joining base material for a distance of 1/2 T but not less than 1/2 inch beyond the edge of the veld. During examination of piping welds, wherever feasible, the scanning of the examination volume l
shall be carried out from both sides of the veld. Where configura-tion or adjecent parts are such that scanning from both sides of the veld is not practical, a full vee technique from one side or a 1/2 vee technique from both sides shall be considered acceptable.
Any areas not scanned shall be described-in detai3 on the Ultra-sonic Examination Data Sheet (Figure 7).
The examination volume shall be scanned by angle beams directed at right angles to the veld axis.
7.3 INTEGRALLY WELDED SUPPORTS The examination volume shall include the veld to the pressure boundary, plus the base metal of the component beneath the weld and along the support attachment for a distance of two support thicknesses.
1 7.4 BOLTING MATERIAL The examination volume shall include 100% of the length of each The examination technique will consist of an axial scan from part.
Rev.:
6-Date:
1/8/87 Procedure NU-UT-1 Page:
7 of 21
4 l
1 one end through the full length or an axial sean from both ends through over 50% of the part length. _The scan (s) shall cover the full end ' surf ace (s).
7.5 COVERAGE To assure complete coverage of the material, each pass of'th'e search unit shall overlap a minimum of 25% of the transducer element i
dimension perpendicular to.the direction of scan. The rateoof search unit movement shall not exceed 6:in/sec.
7.6 WELD IDENTIFICATION AND DATUM POINTS i
The appropriate weld naps in the Program Plan may.be used to locate j
and identify each veld.
1
'I 1.
Prior to examination, the' examiner shall determine if a 1
reference datum point and reference markingtsystem have:been permanently marked for each veld, to which all examination l
data and recorded indications shall be referenced.
l l
2.
If a suitable permanent radiographic marking system exists, these may be used in lieu of an additional set of marks.
1 3.
If no marking exists, then a suitable marking system shall be used to provide permanent marking.
Refer to Procedure
{
NU-UT-4.
1 t
8.
EVALUATION CRITERIA i
l 8.1 RECORDING OF INDICATIONS 1.
For straight beam examinations of base metal for laminations,.
all areas giving indications.than the remaining back a_
reflection shall be recorded on the appropriate Data Sheet (Figure 8) prior to angle beam examination of the weld and required volume.
l l
A.
Each recorded area shall be identified as to distance from surface, length, and' position relative to the weld l
datum point.
B.
Pertinent recorded data shall be taken on each parallel scan pass at increments not to exceed that permitted by the 25% overlap of'transucer element diameter (width).
l 2.
During vessel examinations all indications showing a signal amplituder 50% of DAC shall be plotted. During piping examinations all indiestions showing a signal amplitude 2-20% -
of DAC shall be recorded to the extent of position,' maximum j
DAC and length. All indications showing a signal amplittide
> 20% of DAC shall be pintted.
I Rev.:
6 Date:
1/8/87
' Procedure NU-UT-1 Page:
8 of 21
A.
Recorded data shall be taken on each parallel scan pass at increments not to exceed that permitted by the 25%
overlap of transducer element diameter (width).
i B.
The end points (lengthwise) of recorded indications shall I
be determined by 50% DAC amplitude points.
C.
To determine the height of an indication (W and W 50% DAC.
g 2
3.
Indications from all circumferential velds shall be recorded f
in inches from the veld centerline upstream or downstream and in inches CW from the veld datum point.
i i
4.
Indications for all longitudinal welds shall be recorded in 1
inches upstream or downstream from the veld centerline and in inches CW from the veld datum point.
4 8.2 EVALUATION OF INDICATIONS i'
1.
Evaluation of all indications for inservice inspection shall be made at the reference sensitivity and in accordance with i
the requirements of the referenced ASME Boiler and Pressure Vessel Code,Section XI, Article IWA-3000 and IWB-3000.
Evaluation of indications detected during other than inservice inspections shall be performed in accordance with applicable codes, standards, and specifications.
2.
The results of this evaluation shall be reported to the Plant Owner, or his Agent, in accordance with the requirements of the referenced ASME Boiler and Pressure Vessel Code,Section XI Article IWA-6000. All evaluations will be perf ormed by a level II or Level III Examiner.
Final disposition will be the Plant Owner's responsibility.
9.
EXAMINATION RECORDS I
9.1 CERTIFICATION OF RECORDS a
The examiner shall complete and sign the appropriate veld scan data sheet (s) immediately upon the completion of each veld examination, noting applicable NDE Certification levels.
i l
9.2 FILING OF RECORDS 1.
Records of personnel qualifications shall be raintained by the Examination Contractor. NUSCO employee qualification records shall be maintained by the NQA Section NDE Training j
Coordinator.
l l
1 Rev.:
6 i
Date:
1/8/87 I
Procedure NU 71T-1 Page:
9 of 21 l
w ___. ___
2.
'The Examination Contractor shall be responsible-for submitting to the Plant Owner, or his Agent, a completely documented set.
of examination records including certification of personnel qualifications with a. current eye test report.
9.3 PROCEDURE COP.RECTIONS AND ADDITIONS All procedure' corrections and/or additions required during examinations shall be processed in accordance with NEO Procedure Number 3.11.
l l
l i
Rev.: 6 Date:
1/8/87' Procedure NU-UT-1 Page:
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1 i
Figure 1.
METAL PATH CALIBRATION TABLE j
'l 4 1/2 VEE SCAN PATH EXAMINATION Tath Calibration Material Thickness Range 9
y Required 45' 60' 70' i
2.5" c0.5" 1 0.4" N/A
-I.
5.0"
> 0. 5" -f l. 0"
> 0. 4 " - < 0. 8 "
>0.5"-
10.0"'
> 1. 0" <2. 0"
> 0. 8" - s 1. 6"
> 0. 5" - < 1. 0" l
20.0"
, > 2. 0" -s 4. 5" 1.6"'-
3.3"
> 1. 0" -< 2. 2 "
l
\\
j l
l l
FULL VEE SCAN PATH EXAMINATION Natal Path Calibration Material Thickness Range
]
i.
Required 45' 60*
70*
-l l
2.5" 50.8" 5 0.6" 1 0.4"
'i l
5.0"
> 0. 8 " - s. l. 7 "
5 0.6" - 51.2"
> 0. 4" -s 0. 8" 10.0"
> 1. 7 " - <._3. 5 "
> 1. 2" -< 2. 5"
> 0. 8" s 1. 6" 20.0"
> 3. 5" -6 7. 0"
> 2. 5" -6 5. 0"
>1.6" -q 3.3" 1
i 1/2 VEE SCAN PATH EXAMINATION j
l Metal Path Calibration Material Thickness Range Required 45' 60*
70*
2.5" cl.7" K 1.2" i
< 0.8" l
5.0"
> 1. 7 " - 5_3. 5 "
> 1. 2"
< 2. 5"
> 0. 8"
=E1. 6"
~
l 10.0" 23.5" -5 7.0"
> 2. 5" -T.5. 0"
> 1. 6" - C3. 3" 20.0"
> 7.0" -514. 0"
> 5. 0" - > 10. 0"
> 3.3" -s 6.6" 1 INSTRUCTIONS:
The Vee Path and the examination angle are given in the specific procedures.
Using the appropriate Vee Path Examination Chart (1/2 Vee, Full Vee, and 1-1/2 Vee Paths) and the appropriate examination angle column, find the thickness range that encornpasses the thickness of the material being examined. To this extreme lef t is the Metal Path Calibration to be utilized.
Rev.:
-6 Date:
1/8/87 Procedure NU-UT-1 Page 11 of 21 w______-_-_____
o i
Figure 2 ANGLE BEAM VERIFICATION BLOCK I
R-1
[
h R-2 100%
L n
11 lI I
y s
90 s
/ 1 in.
3g.N c.
so.
80 N
.o*
N g
70 N
60 0
2 in.
N
' N 50 60 40 1
70*
30 1
20 f
I 10 i
1 l
l 1
2 3
4 5
6 7
8 9
10 l
l METAL PATH CALIBRATION FOR A 2.5" CRT PRESENTATION T-'
l I
1.
Obtain a maximized indication from the short radius (R-1) reflection i
surface of the " Miniature Angle Beam Verification Block" (1" metal path).
i 2.
Using the material calibration control and the delay control, align i
l this signal at CRT position 4 3.
Revolve the search unit around and obtain a maximized indication l
from the long radius (R-2) reflection surface (2" metal path).
{
1 4.
Using the material calibration control align this signal at CRT position 8.
5.
Repeat steps 1 through 4 until no further adjustments need to be accomplished.
6.
The CRT is now calibrated in inches of metal path, (each major division equaling 1/4 inch). Make no further adjustments to the sweep range or delay controls.
I 1
Rev.:
6 l
Date:
1/8/87 Procedure NU-UT-1 Page 12 of 21
l Figure 3 ANGLE BEAP VERIFICATION BLOCK
[
\\
R-1
_R-2 l'
,t
, /1 in. s b
N
/
0*
30A I
N N
g 0
2 in. \\\\
[]
N w.
111
.,o.
IEIll II l
1 I I
1 1
METAL PATil CALIBRATION 5" CRT PRESENTATION q
1.
Obtain a maximized indication from the short radius (R-1) reflection surface of the " Miniature Angle B,eam Verification Birck" (l" metal path).
2.
UsinF the materini calibration control and the delay control, align j
this si nni at CRT position 2.
F 3.
Increase the instrument gain until a secondary echo occurs.
j 4.
Align the secondary signal at CRT position 8.
I 5.
For reference check the primary signal from the long radius (2").
l This signal shculd peak at CRT position 4
~
6.
The CRT 1s now calibrated in inches of metal path. (each major division equaling 1/2 inch). Make no further adjustments to the j
sweep range or delay controls, j
j l
j j
i l
Rev.:
6 Date:
1/8/87 i
Procedure NU-UT-1 Page 13 of 21
1 Figure 4 ANGLE BEAM VERIFICATION BLOCK h-;
[
p2
-s II II I
s*'
e s
s s
,/1 in'.
N 45' 60*
C' 30 ss gg, 0
2 in. %%
N N 60* 70*
l i
METAL PATH CALIBRATION 10" PRESENTATION
.g._,
1.
Obtain a maximized indication from the short radius (R-2) reflection surface of the " Miniature Angle Beam Verification Block" (2" metal path).
2.
Using the material calibration control and the delay control, align this signal at CRT position 2.
I 3.
Increase the instrument gain until secondary echos occur.
4 Align the secondary echos at CRT positions 5 and 8.
5.
The CRT is now calibrated in inches of metal path (each major division equaling 1 inch). Make no further adjustments to the sweep range or delay controls.
Rev.:
6 Date:
1/8/87 Procedure NU-UT-1 Page 14 of 21
Figure 5 j
i i
ANGLE BEAM VERIFICATION BLOCK I
R-1
[~
R-2 1
ss II lI I
j y/
,/
N
/ 1 in.
N 45*
60*
' \\\\
O' 0
2 in.
N
'\\
60*
l 70*
I l
METAL PATH CALIBRATION FOR A 20" CRT PRESENTATION l
1.
Obtain e maximized indication from the short radius (R-2) reflection surface of the " Miniature Angle Beam Verification Block" (2" metal path).
2.
Using the material calibration control and the delay control, align this signal at CRT position 1.
3.
Increase the instrument gain until secondary echos occur.
4 Secondary echos shall be aligned at CRT positions 2.5 and 4.
5.
The CRT is now calibrated in inches of metal path (each major divisien equaling 2 inches). Make no further adjustments, to the sweep range or delay controls, l
l i
3 l
l 1
l I
Rev.:
6 Date:
1/8/P7 Procedure NU-UT-1 i
Page 15 of 21 1
i.
'dULTRASONICCALIBRATIONDATASHEET (Refer to Attachment.1 to fill in each blank)-
Cal. Data Sheet No.
5 C
Plant 1
Unit 2
/
System 6 Cal Block No.
7 Surface'0D / 8 / ID / 9 /
Block Temp.
10
- F. Isometric Drawing No.
11 b
i Instrument Model No.
12 Instrument S/N 13 Cable Type 14 Cable Length 15 Couplant Brand 16 Couplant Batch 17 Q.C. Identifier 18 l
l l
-CRT Calibrated in 19 inches of retal path INSTR. LINEARITY CAL. 20
'I)iSTRUMDIT. SETTING SEARCH UNIT 28 kej ec t High Lov High Low 22 Scan Angle 28 1
100 6
50 Damping 23 Mode
- T or C 29 j
2 90 7
40 Frequency 9A Style or Type 30 l
3 80 8
30 Jack 25 Size and Shape-31 l
l l
4 70 9
20 Filter 9A Brand 32 i
5 60 Serial No.
33 Frequency 34 l
Measured Angle 3s 7-8 100 DAC Curve 36 WPL. CONTROL LINEARITY 21 90)
Calibration Checks 37 Initial dB Result 80 Time 80
-6 70 Initial Cal.
80
-12 60 Intermediate 40
+6 50 Intermediate l
20
+12 1 40 Final Cal.
l 30 i
~ GAIN SETTINGS 27 20 Ref Scan 10 Axial SDH 0
l Cire SDH 0 1 2 3 4 5 6 7 8 9 10 Axial Notch dire Notch 1
2 3
4 5
Other Ref.
Position Calibration / Beam Spread Measurement M
Supplement Sheet Yes No Examiners:
41 41 1
1.
38 Levri Date 2.
Leve; Date i
Revfever 39 Level Date ANII 40 Date Rev.:
6 Date:
1/8/87
. Procedure NU-UT-1 Page 16 of 21
Figura 7 Ultrasonic Examination Data Sheet (Refer to Attachment 2 to fill in each blank)-
Page 5 'of
=
Cal. Data Sheet No.
6 Examination Data Sheet No.
7 Plant 1
Unit 2
/
System 8
Weld No.
9 Weld Type 10 i
Examiner 11 Level Date Examiner Level Date J
Search Angle 12 Material Thickness 13 Weld Width 14 l
I Scanning Sensitivity 15 db Exam From:
ID /
16 / OD /
17 /
i
)
1 Component Temp.
30
- F PERFORMED INDICATION (S)
EXAMINATIONS YES.
NO YES1.YES2 SO 1R
- 1) BASE METAL L-WAVE - _ __
V t_.
ig 70
- 2) ANGLE BEAM NORSE y
Km, 97 l
- 3) ANGLE BEAM NORMAL 4
73 j
l i
.)
ANGLE BEAM ALONG SAMPLE - m[- CW --
~
i
- 5) ANGLE BEAM ALONG SAMPLE - [
~ CCW LEGEND YES1 - UIR REQUIRED b 4
- 6) L-WAVE OF WELD YES2 - ACCEPTABLE, GEOMETRY A
NO
- FOR YES2 INDICATIONS M'JST bL ift\\ 7) L-WAVE FOR TH 1C KN E S S - - - - - - - - - - - - -
EVALUATED BY RADIOGRAPHS. OR SUPPLEMENTAL EVALUATION TO ADDITIONAL SHEETS?
29 (CHECK BOX)
DETERMINE IF INDICATION IS Continuation Beam Plot GEOMETRIC Supplements None Procedure Used 25 Rev.
I Comments 26
{
I Reviewer 27 Level Date ANII 28 Date l
J j
I 1i Rev.:
6 Date:
1/8/87 l
Procedure _
NU-UT-1 Page 17 of 21-1
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'1
'I
-Page 1
of' j
Cal. Data Sheet No.
2 Exam. Data Sheet No.
3-Position Calibration / Beam Spread Measurement Supplement Sheet
{
'(Refer to Attachment 5 to fill in each blank) j l
.-4 Distance from Search Unit Exit Point to Calibration Standard Scribe Line i
Movement Peak Movement Toward Hole Indication Away From Hole 1
1/4T.
4 1/2T I
3 o
3/4T
- q 1
6 5
)
i Calibration Block No.:
7
')
l Plant / Unit:
8' Transducer Serial No:
9 Nominal Wedge Angle:
10 Calibration Data Sheet No.:
11 t
Signature:
12 Level:
Date Examiner 12 Level:
Date _
Examiner 13 Level:
Date 1
Reviewer 14 Date ANII Rev.:
6-Date:
1/8/87 Procedure NU-UT-1 Page 20 of 21' 1
Figura 11 j
(Refer to Attachment 6 to fill in each blank)
)
. Ultrasonic Instrument ULTRASONIC INSTRUMENT LINEARITY RECORD Page 3 of f
Model No.
1 Serial No.
2 Calibration Block 4 l
Type:
Stainless i
Carbon j
Serial No.:
Transducer Brand 5
Frequency Size Straight Beam (
)
Brand 6
Frequency Size Angle Beam
(
)
HORIZONTAL LINEARITY SCREEN HEIGiff LINEARITY SIGNAL AMPLITUDES IN !S% OF FSH 7
(Calculate) 3 Actual Actual 8
Back Grid Accept No.
Higher 1/2 Higher Accept.
Lower Raf1ector Loc.
Limits Signal Higher Limits
- Signal 1
1 1
1 100 (50) 55-45 2
1.90-2.10 2
90 (45) 50-40 i
3 2.85-3.15 3
80 (40) 35 4
3.80-4.10 4
70 (35) 40-30 i
5 "T.75-5.25 5
60 (30) 35-25 6
5.70-6.30 6
50 (25) 30-20
_ _ " l 7
6.65-7.35 7
40 (20) 25-15 l
8 7.60-8.40 8
30 (15) 20-10
~
9 8.55-9.45 9
20 (10) 15-5 10 10 10 10 10
( 5) 10-0
- ACCEPTANCE LIMITS ARE 1/2 0F THE HIGHER SIGNAL 2 FSH AMPLITUDE CONTROL LINEARITY 9
Initial db Amplitude Change Result Limit 80% FSH Down 6 32% - 48%
80% FSH Down 12 16% - 24%
40% FSH Up 6 64% - 96%
20% FSH Up 12 64% - 96%
THIS INSTRUMENT IS CONSIDERED:
( 10 ) ACCEPTABLE
(
) NOT ACCEPTABLE Exoniner 11 Date Level R viewer 12 Date Level ANII 13 Date Rev.:
6 Date:
1/8/87 Procedure NU-UT-1 Page 21 of 21 1
u_ _ _ _
I 1
r Page 1 of 2
]
i
/hi NU-UT-1 ULTRASONIC CALIBRATION DATA SHEET k l
1.
Plant - record the plant you are working at - Millstone, CY, etc.
2.
Unit - record the unit that you are working at.
l 3.
PSI - check with an "X" if this is a baseline exam.
4.
ISI - check with an "X" if this is an inservice exam.
l 5.
Cal. Data Sheet No. - record calibration data sheet number.
6.
System - record the system being examined - main steam, recire.
etc.
7.
Cal. Block No. - record the calibration block used - UT-7, UT-8, i
etc.
8.
Surface OD - check with an "X" if exam is done free OD.
9.
Surface ID - check with an "X" if exam is done from ID.
10.
Block Temp. - record calibration block temperature.
11.
Isometric Drawing No. - record isometric drawing number used.
12.
Instrument Model No. - record the model of the instrument being used.
13.
Instrument S/N - record the serial number of the instrument being used.
14 Cable Type'- record the cable type being used - RG-58A/U, etc.
15.
Cable Length - record the length of cable being used.
16.
Couplant Brand - record the brand of couplant being used -
Exosen 30, etc.
17.
Couplant Batch - record the batch number of the couplant.
18.
0.C. Identifier - this is a unique number assf ned by the F
warehouses at CY & Millstone and labeled on couplant jugs when drawn from the warehouse.
For example, at CY, this would be CYSN -
and at Millstone MRIR #
Record this in the space provided. This allows someone to backtrack to the original purchase order and necessary certifications, whereas just a batch number would not.
For sendor supplied materials, this may be any unique identifer.
19.
CRT calibration in inch (s of metal path - record the size of screen being used - 5",
10", etc.
20.
Instrument Linearity - record the amplitude of the second si nal on F
the CRT in the spaces provided.
21.
Amplitude Contr.o1 Linearity - record the amplitude of the signal on the CRT for each db setting in the spaces provided.
22.
Reject - record the reject setting of the instrument being used.
23.
Damping - record the damping setting of the instrument being used.
24.
Frequency - record the frequency setting of the instrument being used.
25.
Jack - record the jack being used - T.R. or T/R.
26.
Filter - record the filter setting of the inctrument being used.
27.
Gain Settings:
Axial Side Drilled Holes (circumferential scan) - record the a.
reference and scanning gain settings when calibrated on the i
axial cide drilled holes and scanning circumferential1y.
pp
p I
Pega 2 of 2 b.
Circumferential Side Drilled Holes'(axial scan) - record the jdh ref6rence and scanning gain' settings when calibrated.on the circumferential side drilled holes and scanning axially, c '.
Asiat Fotch (circumferential' scan).- record the reference scanning gain settings when calibrated on the axial notches and scanning circumferential1y.
d.
Circumferential Notch (axial scan) - record the reference and scanning gain settings when calibrated on the circumferential notches and scanning' axially.
Other Reflectors - record the reference and scanning gain e.
settinEs when calibrat.ed on reflectors other than notches or side drilled holes.
28.
Scan Angle - record the. nominal scan angle being used
,45*. 60*,
etc.
29.
Mode - Tfor C circle whether transverse (shear) or compressional waves.(16ngitudinal) are being used to examine the component (s).
30.
Style or Type - this is usually stamped on the transducer and is designated as alpha, gamma, or delta.
31.
Size and Shape - record element size and shape as specified on the transducer or in transducer. catalog.
l 32.
Brand - record the manufacturer of the transducer - Aerotech, Sonic, etc.
gr- -
33.
Serial No. ~- record the serial number stamped or etched on the i
transducer.
f 34 Frequency,- record the frequency as stamped or etched on the 1
transducer.
4
- 35. Measured Angle - record the angle as measured on the IIW block.
l 36.
DAC Curve - record the distance amplitude correction curve from the l
CRT.
37.
Calibration Checks - record the initial, intermediate, and final I
calibration times in military time - 0700, 1400, etc.
l
.,38.
Examiners - record examiner's signatures, level of certification, and date of examination.
39.
Reviewer - record reviewer's signature, level of certification, and j
date the reviewer shall be an NU certified Level II or III.
j$h3 40.
ANII - record Authorized Nuclear Inservice Inspector's signature and date.
41.
Position Calibration / Beam Spread Supplement Sheet.- Check with an
/7\\
"X" if attached under yes block or no if not attached.
I l
1 i
i t
,; v y.
3;
,q; g..5.3.. i
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4, l I
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'to-
+
- h (/
s w +,
-l NU-UT-1. ULTRASONIC EXAMINATION DATA SHEET 7
N 3
- j u,j s
1.
Plant - record the plant that. you are working cet - 11111st'one l.
[
O CY, etc.
..[
r 9
2.
Unit - record the unitLthat you'are working at.'
f y
3..
PSI - check with an "X"' if this is' a' base line exat'l
' /
4.
ISI - check with an "X" if this is'an-inservice' exam.
'i 5.
Page of
. record each page number cf tota) number 1of pages.
6.
Cal. Data Sheet No.'- record calibration data sheet number'from
+
block number 5 on Figure-6.
p
,y...
'M:..
7.
Examination ' Data Sheet No. :;- record ~ examination. datc.'I sheetirpinber.
8.
System
- record the system being - examined - main stenn,' recirc., (.
etc.
10 W
9.
Weld No. - record the. weld number b'eing examined as designated in, d the ISI.or PSI program plan.
C I
10.
Weld. Type - record the veld type being examined - pi*pe,to Valve, a
tee to pipe, etc.
11.
Examiner - record examiner's signatures, level of certification. /'j t_
and date of examination.
,,7 it 12.
Search Angle - record the measured angle' being used to annine fd Component.
y e
, g
')
- 13. Material Thickness - record the nominal wall thickness.,
,)
14 Weld Width - record the actual weld width taken in field./
15.
Scanning Sensitivity - record the actual scanning sensitivity "4
16.
Exam from ID - check with an "X" if exam.is done from ID.
17.
Exam from OD - check with an "X" if exam is done from OD.
< ~
18.
Base Metal L-Wave - check with an "X".in.' appropriate boxes. '
li 1
- 19.. Angle Beam Normal
- check with an'"X" in appropriate boxes.
20.
Angle Beam Normal
- check with an "X"'in appropriate boxes.
21.
Angle Beam Along Weld CW - check with an "X" in appropriate boxss.
22.
Angle Beam Along Weld CCW - check with an "X" in appropriatezhaxes.'
., t
(
(
23.
L-Wave of Weld - check with'an "E" in appropriate boxes.
i
)
4 24.
L-Wave for Thickness - check with an "X" in appropriate boxes.
25.
Procedure Used - record procedure and revision used"for exam.
26.
Comments - record any examiner's comments.
27.
Reviewer-recordreviewer'ssignature,levelofcertidcationfard date the reviewer shall be an NU certified Leviel II or'III.
f 28.
ANII - record Authorized Nuclear Inservices InspectorTsignature and date.
/'
29.
Additional Sheets - check with an "X" which sheet is attacheq.
'41 30.
Component Temperature - record component temperatur %
J d,
/
g Ab i
4 o
~
t j. +
l 1.
i,
- 3. 4 t
') - )
,lj j 's
>d 9 -)
(-
,)
).
t 7
f
..b.
9
- g l1 0;
l;%
q, g
8,&
- .n '.
Papo l'of'2.
g p
ry I'
1 C
r Ultrasonic Indication Continuation Examination Data Sheet U
q Attachment.3 NU-UT-1
?
i 1.
'F.lant - record the plant that you are working atL--Millstone.
i; C1, etc.;
['
-2.
sUnit - record ~the unit that.you are working at.-
n>-
,3.
Weld,N6.-- record the weld number being examined as designated in the ISI or PSI' program plan.
4.
Examiner - record examiner's signature and level of certification.
i-5.
L 1 cati n - this is the top dead center of the pipe or the O
position'of the radiographic mark.
l 6.
VO Iccation - this is the top dead center ofithe' pipe on; the weld '
i
, center line or the position.of the radiographic mark on the weld'
' c' enter line.
7.
We'id Width - this is the width of the veld as measured free tov-to-toe.
S.
Date - record the date of the examination.
. Page of
- record each page number and total number of 19..
- l. pages.
10.,'
. Cal.. Data Sheet No. - record calibration data sheet number from h bicek number 5 on Figure.6.
l IJ.
Exem. Data Sheet No. - record examination data sheet number fror C
', blob' number 7 on Figure 7.
- 12., Thickness - this is the measured thickness of the weld or the t thickness as stated.on the drawing of the weld.
l 13.
In Lication Number - this is a number which is assigned to a l
recordable indication on a specific weld..
14.
Exam No.
record the examination number where indication was defected - 2, 5, etc.
I 15.
Percent of DAC - is the percent of the DAC for the maximum amplitude of a recordable indication.
16.
W - this is the position of the exit point of the transducer as weasured from the weld center line or from the toe of the veld for Ethe maximum signal amplitude from the indicator.
l li '. MP
.this is the metal path for the maximum signal amplitude from the indication.
18.
W, this is the metal path when the transducer is moved toward'the w&ld center line where the signal from the indication drops to 50 percent DAC, 19.
MP - this is the metal path for the forward 50 percent DAC position a the transducer.
20.
W
- this:ts.the metal path when the transducer is moved away'from t$eweldcenterlinewherethesignalfromtheindicationdrops.to 50 percent DAC.
21.
MP - this is the metal path for the backward 50 percent DAC
. position of the transducer.
22.
L - this-is the position of the center line of the transducer mdasuredfromL where the signal from the. indication drops to its o
first 50 percent DAC point.
A_.
1 Pegs 2~of 2-I 23.
L Max. - this is the position of the center line of the transducer
/5\\
measured from the t to where the signal from the indication is at o
its maximum amplitude.
24.. L.- this is the position of the center line of the transducer 2
measured from t where the signal from the indication drops to its o
second 50 percent DAC point.-
25.
,RBR' Amplitude - this. is the remaining back reflection amplitude when performing a zero degree scan.
p 26.
Search Unit Location - if the examination of the component is being done from the OD, the search unit. location shall be recorded as OD.
If the examination is being done from the ID, the search unit location shall be recorded as ID.
27.
Remarks - record any examiner's comments.
- 28. ' Reviewer - record reviewer's signature, level of certification, and jgg date. The reviewer shall be an NU certified Level II or III.
29.
ANII - record Authorized Nuclear Inservice Inspector's signature and date.
i l
l l
e l
l 1
l l
Page 1 of 1 Ultrasonic Indication Continuation. Examination Data Plot Sheet
/$k -
NU-UT-1 1.
Weld No.~- record the weld number being examined as designated inL the ISI or PSI program plan.
2.
Examination Data Sheet No. - record examination data sheet number from block number 7 on Figure 7.
3.
Evaluation - check with.an."X" in appropriate box.
If other is checked, written explanation is required.
{
4.
Examiner
. record examiner's s1Fnature', level ~of certification,.snd -
j}
date of examination.
5.
Reviewed By
. record reviewer's signature, level-of certification, and date.
The reviewer shall be an NU certified Level II or III.
/6\\-
6.
ANII - record Authorized Nuclear Inservice Inspector's signature
.)
and date.
J 7.
.Page of
- record each page number and total number of I
pages.
l 8.
Cal. Data Sheet No. - record calibration data sheet number from-block number 5 on Figure 6.
jgs' l
1 I
Pega'1 of 1 i
Attachment.5 e
NU-UT-1 POSITIONS CALIBRATION / BEAM SPREAD MEASUREMENT b
SUPPLEMENT SHEET t]
1.
Page of
- record each page number.and. total number of pages.
2.
Cal. Data Sheet No. - record calibration data sheet number from i
block' number 5 on Figure 6.
f 3.
. Examination Data Sheet No. -' record examination data sheet nu.! er.
'i 4.
1/4T. record peak indication, 50 percent DAC forward-and-50 percent DAC movements f rom 1/4T in-line hole cm code calibration L
block.
l 5.
1/2T - record peak indication, 50 percent.DAC forward and i
50 percent DAC movements from 1/2T in-line hole on code calibration I
block.
6.
3/4T - record peak indication, 50 percent DAC' forward'and 50 percent DAC movements from 3/4T in-line hole'on code calibration block.
7.
Calibration' Block No. - record code calibration block number -
UT-1, etc.
8.
Plant / Unit - record plant and unit number you are working at.
9.
Transducer Serial No. - record the serial number stamped or etched on the transducer.
10.
Nomnal Wedge Angle - record the nominal wedge angle - 45', 60*,
etc.
11.
Calibration Sheet No. - record calibration data sheet number from block number 5 on Figure 6.
12.
Examiner - record examiner's signatures, level of certification, and-date of examination.
13.
Reviewer - record reviewer's signature, level of certification, and date. The reviewer shall be an NU certified Level II or III.
i 14.
M4II - record Authorized Nuclear Inservice Inspector's signature and date.
I i
4
Page 1 of 1 b
m NU-UT-1 ULTRASONIC INSTRUMENT LINEARITY REC Model No. - record the model of the instrument.
t Serial No. - record the serial number of the instrumen.
3 number of hu 1.
Page,___ of ____ - record each page number and tota 2.
block used, 3.
Calibration Block - record the type of calibration l number of block.
pages.
stainless or carbon, with an "X" and record ser a i e, and 4.
Transducer Straight Beam - record brand, frequency, s z ble.
serial number in appropriate spaces as applica nd serial 5.
(
i Transducer Angle Beam - rec'ord brand, frequency, s ze, a number in appropriate spaces as applicable. Horizontal i
ls on the 6.
h cond signal 7.
CRT in the spaces provided. Screen Height Linearity - record the on the CRT in the spaces provided. Amplitude Control Lin f the signal on 8.
ovided.
]
the CRT for each db setting in the spaces pr t is acceptable 9
Acceptable /Not Acceptable - record whether instrumen h
propriate space.
I or not acceptable by checking with an "X"
in t e apExaminer - record examiner's signature, level ification, and 10.
ification, and f
11.
date of examination. Reviewer - record reviewer's signature, level of cert 12.
ignature ANII - record Authorized Nuclear Inservice Inspector s s date.
13.
and date.
e T
TAB 1 INSPECTION RESULTS Table I lists the piping which recorded wall loss j
49% or greater.
Table II lists the piping which recorded wall loss in the range of 30% to 49%.
These ranges of 1
wall loss were defined by Unit II Engineering and were used throughout the inspection.
Piping recording measurable wall loss but less than 30% is tabulated on the first 1
page of each section of the data sheets, for convenience.
Most areas recording wall loss 30% or greater were found in the Extraction Steam Piping, with a lesser number of thinned areas on the feedwater heater vent piping and 1
service water piping.
Each of these thinned areas was
-j
~
delineated on the piping, at the time of inspection, l
and immediately reported to Unit II Engineering.
O 1
The wall loss on the extraction steam piping appears to be the result of wet steam erosion which is essentially high velocity water impingement.
On the service water piping, the wall loss is the result of seawater corrosion and erosion.
The damage mechanisms in these systems are not surprising and seem likely to continue as they relate to the normal environment in the piping systems.
The other systems recording wall loss 30% or greater were the 4A/4B feedwater heater continuous vent piping, the service water supply line to chlorinator skid, the condenser waterbox priming lines.
Here again, the wall loss appears to be related to the normal function of the piping systems, and can be expected to continue.
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L HARDWARE-AND DATA IDENTIFICATION i
f Each' item of hardware or component inspected in a 1
)
given system was identified by its individual characteristics,
)
i.e.,
45' or 90* elbow, tee, vertical run, horizontal run, reducer or other.
Each. item in the system was then
~
numbered in a' preselected sequence utilizing isometric.
drawings or sketches, where drawings were not'available.
This provided for complete. documentation and traceability.
of data back to a specific. item or component.
On each item or component,.a number of thickness readings were taken.
To permit future identification of the specific location at which any individual reading was taken, a layout plan was established.
The plans consist 1
of establishing a numbering convention and drawing grids on the components, in accordance with that convention.
The layout plan is detailed in Figure 1.
(
All entries on the data sheets are referenced to a specific item or component and a location on that item or component, in accordance with the layout plan.
Use of this data identification system will permit determination of changes in wall loss, by reinspection, in the future, at these same locations.
Where available, isometric drawings are included in the.
report to facilitate identification of line items.
Where isometric drawings were not available, sketches were made to provide traceability.
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TAB 3-
- INSPECTION PROCEDURE Cramer & Lindell Engineers, Inc. Procedure.dT 002, "Special Process Specification.for Ultrasonic Thickness Examination",.was utilized for this inspection.
The'
~
ultrasonic: instruments wers calibrated on like material in the form of step wedges of known, measured thickness, values.
The instruments were calibrated to encompass the range of thicknesses to be examined.
A digital instrument (1) was'used on piping to permit-accuracy of readings to the nearest.001".
Where material l
grain structure or surface-condition.was.not' conducive to-good digital results, an ultrasonic cathode ray tube
( " A 't Scan) instrument was used.
The "A"
Scan instrument, was also used to verify. digital ~results when1 questionable
^
readings were obtained.
Results can be influenced by-grain structure or material processing discontinuities l
such as laminations.
Digital instruments can only display.
one thickness value at a time and if the internal discontinuity in the test item is cross sectionally.large enough to reflect the majority of induced sound, then a j
shallow reading (less than total wall) will be indicated.
The "A" Scan instrument, however, will allow continuous montioring during scanning and provides multiple echoes when discontinuities are present.
Laminations may not yield a multiple echo, but simply a single echo, shallower than the actual wall thickness.
In this case, the cross sectional area of the lamination is such that.the majority of induced sound is reflected from the lamination and'little, if any, reaches the opposite wall.
The "A" Scan instrument-was~also used to inspect cast iron pipe,Las the high frequincy transducer used:with digital equipment is not suitable to inspect coarse grain materials.
High frequency sound in coarse grain materials is highly attenuated and cannot penetrate through to the-1 A "T-Mike" by Stress-Tel 8
l 1
INSPECTION PROCEDURE cont'd l
opposite wall.
The "A" Scan instrument, however, can be i
set up with transducers of a lower frequency which will penetrate the coarse grain structure and permit an I
accurate inspection.
i l
1 I
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(
A Q
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1 9
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.)
t ll Docket No. 50-423
'l A06665
]
1
.i 1
i l
I i
Response to NRC Bulletin 87-01 Millstone Nuclear Power Station, Unit No. 3 l
i l
I l
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l 1
l September 1987 N
l 1
NRC ACTIONS /0UESTIONS j
l 1.
Identify the codes or standards to which the piping was designed and f abricated.
NNECO Response:
1 The piping at Millstone Station, Unit No. 3 was designed and
)
fabricated to ASMB Section III, 1971' edition with 73 addendum.
2.
Describe the scope and extent of your programs for ensuring that pipe wall thicknesses are not reduced below the minimum l
allowable thickness.
Include in the description the criteria i
that you have established for:
l a.
selecting points at which to make thickness measurements b.
determining how frequently to make thickness measurements c.
selecting the methods used'to make-thickness measurements i
d.
making replacement / repair decisions NNECO Response:
Since Millstone Unit No. 3 is currently completing its first operating cycle, our inspection program is still being I
developed.
The scope of the program will include the l
selection criteria for systems to be examined, procedures for determining where to examine and how to establish a sampling p rog ram.
1 3.
For liquid-phase systems, state specifically whether the l
following factors have been considered in establishing your I
criteria for selecting points at which to monitor piping
{
thickness (Item 2a):
a.
piping material (e.g., chromium content) b.
piping configuration ( e.g., fittings less than 10 pipe diameters apart) c.
pH of water in the system (e.g., pH less than 10) d.
system temperature ( e.g., between 190 and 500 F) e.
fluid bulk velocity (e.g., greater than 10 ft/s) l f.
oxygen content in the system (e.g.,
oxygen content less than 50 ppb)
NNECO Response:
The criteria listed above will be used in selection of inspection population.
Y__________-___
7 I
Pag e 2 4.
Chronologically list and summarize the results of' all l
inspections that have been performed, which were specifically conducted for the purpose of identifying ' pipe wall thinning,
-whether or not pipe wall thinning was discovered, and any.
other inspections where pipe wall thinning was discovered even though that was not the purpose of that inspection.
a.
Briefly describe the inspection program and. indicate I
whether it was specifically intended to measure wall j
thickness or whether wall thickness measurements were an i
incidental determination.
i l
(e.g., describe ~
l l
b.
Describe what piping' was examined and how the inspection instrument (s), test method, reference thickness, locations examined, means for locating measurement point (s) in subsequent inspections).
c.
Report thickness measurement results and note those that were identified as unacceptable and why.
I H
d.
Describe actions already taken or planned for piping that j
has been found to have a nonconforming wall thickness.
j j
If you have performed a failure analysis, include'the j
results of that analysis.
Indicate whether the actions l
i involve repair or replacement, including any change of l
materials.
f NNECO Response :
j l
Millstone Station, Unit No. 3 is in the process of completing
)
its first operating cycle.
The program is not yet ready for
)
implementation.
5.
Describe any plans either for revising the present or for developing new or additional programs for monitoring pipe l
wall thickness.
1 NNECO Response:
In a letter dated June 10, 1987,I1) NNECO indicated that we are an active participant in the NUMARC Working Group on Piping Erosion / Control.
In an effort to be consistent with the industry and maintain consistency within our organi-zation, NNECO intends to meet the guidelines established by c
l this group for Millstone Unit No.
3.
1 l
(1) E. J.
Mroczka Letter to U.S.
Nuclear Regulatory Commission,
" Piping Inspection Programs to Detect Erosion / Corrosion Wear," dated June 10, 1987.
1 b
. _ _ _ _ _.