ML20234D464
| ML20234D464 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck, 05000000 |
| Issue date: | 06/16/1987 |
| From: | CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | |
| Shared Package | |
| ML20234D443 | List: |
| References | |
| NU-UT-5, NUDOCS 8709220099 | |
| Download: ML20234D464 (14) | |
Text
-.
- w-< m e-n JUN 161987 PLANT OPERATIONS REYlEW COut ITTEE APPROYAL j
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Conasecicut Yankee /NU
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2GE Procedure
!!U-UT-3 2, igw.
Esvision:
'3 Date:
1-8-87 oy TI' ~e.E :
Ultrasenic Examination Procedure for
""I#'
Thickness Measurements g7 1
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This procedure delineates the techniques for the ultrasonic measurement of taterial thickness using dual crystal and~ single crystal methods.
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8709220099 870911 ADDCK 05000213 PDR PDR G
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i Ultrasonic Examination Procedure for Thickness Measurements l
l Northeast Utilities l
l Approval T
Concurrence Compliance Revision /Date
'NUSCO Level III/Date Manager QA/Date A.I.A.
Date 0 3/18/81 J. M. Stanhoshi 6/17/81 D. G. Diedrich 8/27/81 H.S.B. 9/22/81 1 3/23/84 J. M. Stanhoshi 4/9/84 D. G. Diedrich 4/10/84 E.S.B. 4/2/S4 h.0 C 5\\wBi //if-(flri 4.u..
2 5/19/86 [
Cd2N4 N
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\\ kW 3 1/8/87
'/
NEN7 Always verify with NDE Procedure Status Log before using this procedure.
Procedure NU-UT-5
'JUNi819s ut c.scn c TE:CacEss nEasUt_*.z :
1 1.
SCOPE' This procedure delineates the techniques for the ultrasonic measurement' of. material thickness.
1 Note:A.
For thicknesses from.250 inches to 1.50 inches.the dual crystal method is generally used.
1 B.
For thicknesses 1.50. inches the single crystal method'is i
preferred.
C.
For thicknesses'
.250" the delay tip single crystal method is preferred.
2.
GENERAL 1
2.1 FIFERENCES 1.
ASNT, SNT-TC-1A, 1980 Edition.
2.
NU-UT-1 Ultrasonic Examination ?:ocedure General Requirements l
2.2 PEF.SONNEL QUALIFICATION -
q 1.
Ultrasonie exa=ination personnel shall be certified in'accor-l dance with the above references.
2.
Thickness measurements for " code record" purposes shall be~
performed by personnel vithLa'ninimum qualification of Level l
II.
l 3.
Personnel performing ena=inations not required by code are not required to be certified to paragraph 2.2.1.
3.
CJ".MINATION REQUIREMENTS 3.1 E*JLGATION FREQUENCY 1.
Tne examination frequency shall be the highest available which vill provide adequate penet:ntion. Generally, 5.0 ME: is preferred.
2.
Pulse frequencies shall be deter =ined by such variables as material attenuation, thickness, etc., to achieve penetration' or resolution. This information shall be recorded on the.
data sheets.
1.
Lower frequencies are generally chosen for thicker sections and for cast material.
Rev.:
3 Da:c:
1/8/87
? ocedure NU-UT-5 Page:
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3.2 LIQUE COU?LANT The ultrasonic couplan: shall be certified to contain less than 1*.
sulfur and halegens by weight.
The couplant shall be supplied in
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..,. c. n.. e c.:.e... : : :..,,.........,
....u..
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3.3 SUEFACE PRF.?ARATION A*1 examination surfaces shall be clean and free of dirt, mill
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c.h,,.
..n.a.s.s.. _ c... <
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o.
. u interfere vi:h the ena=ination or impair proper transmission of the sound beam.
Any identification which is removed to facilitate the exa=ination shall be re-marked upon completion of the ena=inatien.
3. l.
DATUM GT.D (kdEN USEFUL)
"he enaciner may temporarily = ark, using an approved =arker, er verify that there has been marked, a reference datum grid on each item from which all enceination data and reported thicknesses =av be referenced.
The perpendicular grid lines should be located on ~
nc=inal 1" centers measured from :he center or one corner of'the 4.
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JUN16D87 5 '.
-Search Unit, Dual 2.25MEc,. 250" or. 375" diameter i
6.
Search unit,' Dual 5;0MHz,.250" or'.375" diameter 7.
Couplant.
8.
. Post-e::acination cleanup of examination arec 4.2 PLANT OWER'S EQUIPMENT i
The' Plant Owner, or his Agent, shall provide the following service facilities and equipment as required:
l I
1.
Scaffolding 2.
Water, air,and electricity 3.
Temporar7 lighting j
4.
Moving or lifting devices i
5.
Reference Blocks j
6.
Examination surface preparation-l I
5.
CALIBRATION OF CRT DISPLAY. INSTRUMENTS 1
5.1 REFERDICE EI.0CK(S).
1.
Sa=ples of-the identical caterial and known thickness should be used. As an alternate, sa=ples of a si=ilar material and the i
same metallurgical structure as that of the ena=1 nation ite=
i may be used.
2.
At least two different known thickness sa=ples are required-for certain ultrasonic thickness calibrations. One'sa=ple should be thinner than the examination item, and one sample should be. thicker than the examination item.
If'other samples are available, these should be machined to thicknesses between-t the above, in even increments, one of which should equal
" minim:m wall".
f 1
5.2 STRAIG'dT BEAM CALIBRA"' ION. (SINGLE CRYSTAL) j 1
Calibration shall be performed as follows; 1.
Select an indication free location on a sarple of known thickness.
R Rev.:
3 Date:
1/S/E7 Procedure NU-L'T-5 Page:
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so thc: the first back reflection f ct the cpposite surface is aligned at CRT position 4 Align the second back reflection at CRT position 8.
3.
Adjust the ins ument sensitivity control to provide back
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4.
The sa:ple thickness must now be mathe=atically divided by s
a factor of 4 to deter =ine the thickness value of each major CRT division.
l
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A 1" thick sample divided by 4 would indicate that each maior CRT division is ecual to.250" and'each miner CF*
divisien would then be equal to.050" depending on the.
number of screen divisions used.
5.
In order to simplify the ca:hematics, calibration sa=ples which ultimately provide even CRT thicimess increments are adviscble. k~nere the choice of thickness saco.les is restricted, the bach reflections ay be aligned c: other CRT positions which may provide more convenien: thickness multiples, i.e. 3, 6, 0,
c: 5, cud 10.
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t.ligned c: cny convenient CR* posi-ion which would bc represent-c:ive of sc=ple thickness.
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5.
F.epect steps 1 cnd 1 cor:cc ini for c:v c-or by adjus:=cn: cf e..,.
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i-m cent.
l search During actual chickness gauging with a dual crystaback re 8.
emit, the firs:
f the examination ite=,
which represents the precise thickness o um D,.G..,..c.s
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l,..e nn.. w.. r.- cc...="r m...cN calibration shall be performed by p.a, libration block thickness.
Digital and meter ins: ucent adjusting the display to ecual the known ca
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A loca:icn for all = measurements.
f an erroneeus reading.
smoothes:
Select the cleanest, cons::ntly changing display is indicative o 6.1 for a steady reading before recording.
- *ci:
icss of signci cnd/or e roneous w
" Rocking" of the transducer can :ause ible.
readings. The ::ansducer must be held as steady as poss 6.2 Use additienti_ "ecin" rather than additional cout. lant.
ac:ura:e where inte= ci
- ansducers are the mos:,. en used for the measurement c:. p,_pe 6.3 Duc1 element cc :osion is an:,c:.ps:ec.
f duci ele =ent ::cnsducers na util thichness, the " cress tc1h bcrrier" o This is i=per:cn:
i
=us be perpendicular to the len;:h of :he p pe. the pipe, (See elements to centa :
to c11ov both pic otle::-1:
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- e Figure :
hecsuremen:r vill be repor:ed en f
=s e-lziin:
. Vi:.n DorOlnctes or Oney -Ey De taDuia:OC
<.11 Tnichnect h
-ufree prid OCp. AdditiOUL1 paget[Sae::hes should be used w en re
- Eure J (.:p:ngs, (vesseis),
of readings.
the 10000i00 2nd/or entent f!Cn E adeOuttel'* describe
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8-*4..*f, L_'__'"*1'-_*'f____
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Dual Element "ransducer
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- 1 PLACDtE;T OF DUAL ELEMEiT TPMSDUCER ON PIPLNG Rev.:
3 Date:
1/S/57
?rocedure W~C"5
JUNI6Gaq
(?.cfer :c 1.ttachment 1 te fill in blanks)
Figure 2 g
VESSEL-WELD THICKNESS SPOT CHE'CK DATA SHEET l
I STATION:
1 UNIT:
2 TRANSDUCER IDENTIFICATION - O' 00MPONENT:
6 SIZE:
3 FREO.:
4 DATE:
7 1
CALIBRATION STANDARD:
5 f
l 1.
Apply a O' straight beam transducer to the surface of the applicable calibration standard in an area free of calibration holes.
Adjust the instrument calibration controls to' display two back reflections.
9 l
2.
Position the back reflections to align at CRT Screen divisions which represent inches of sound path (each najor CRT division equals one
{
inch).
3.
To verify the thickness of conponent ites; place the transducer en l
l the component and using the delay control only, position the first i
l back reflection at CRT position O.
Next, read the CRT Location of I
the second back reflection to the nearest minor CRT division:
j l
4 Spot thickness checks shal1 be taken on the veld and 4" appr'exi=ately
~
l on each side of veld. A minit:um of 4 sets of readings each consisting I
of 3 readings vill be taken on each veld, where possible, and recorded below.
l ErnM ner 8
Level 8
Date 8
(Circle One) 1 = UP, DN, CW, CCW Reviewer 9
Level 9
Date 9
~
2 = UP, DN, CW, CCW ANII 10 Date 10 l
Rev.:
3 l-Date:
1/8/E7 Procedure EU-UT-5 Fage:
7 cf E
Juil 161937 TJ-CT-5 Attachment 1
/,x
^
Figure 2 i
1.
Station - record the station that you are working at, Millstone, CY, etc.
1 2.
Unit - record the unit that you are working on.
j 3.
Site - record the size of the transducer used, f
I 4.
Frecuency - record the frecuency of the transducer used.
]
f 5.
Calibration Standard - record the calibration standard used.
j i
6.
Component - record the component.
1 7.
Date - record the date that thickness measurements were taken.
8.
Examiner - record the examiner's signature, level of certification, and date of examination.
9.
Reviewer - record the reviewer's signature, level of certification, and date. The reviewer shall be a NUSCO certified Level II or III.
l 10.
ANII - record the Authorized Nuclear Inservice Inspector's signature and date.
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Procedure __
NU-UT-5 L_
E : =i.crion Dr r - Ehee- ' h,10 A
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Iigs: t. - 2 f[
.)
PIPING. WELD THICTNESS DATA SHEET:
(Refer to Attachment l2 to fill in b"anks)
R22cINGs o'
90*
180*
270*
4
.5:
- 17.
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l Counter-Bere
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Location l
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Station 8
Uni:
9 Transducer Ircquency 10 Single 11 Dual 12 Transducer Size 13 Weld No.
14 System 15 Unless a digital readou: thickness unit is used, apply a O' Straight Seam Transducer to the surf ace of a "known" thickness calibration block.
Adjust the calibration controls to dispit.y a convenient number of back 3
reflections. Place the back reflee:Lons at the desired CRT Positions for ease in interpretation.
Record all nessurements'in'the spaces provided.
)
.)
L:aminer 16
' Level 16 Date 16 Reviewer 17 Level 17 Date - 17 ANII 18 Date 18
-l Rev.:
3 j
.Date:
1/5/E7 J
Procedure NU-UT-5 Page:
S of B
NU-UT-5 Attach =ent 2 Figure 3 i
1.
Counter-bore Location - record if possible, location of l
counter-bore from centerline.of veld away from reactor prcssure i
vessel.
2.
Counter-bore Location - record is possible, location of counter-bore from centerline of weld towards reactor pressure vessel.
3.
Record where thickness readings were taken in inches.
i i
4.
0* - record thickness readings taken at 0*.
)
1 5.
90* - record thickness readings taken at 90*.
I 6.
180* - record thickness readings taken at 180*.
7.
270* - record thickness readings taken at 270*.
8.
Station - record the station that you are working at, Millstone, CT, etc.
l 9.
Unit-record the unit that _you are working at.
6 I
L
\\
.10.
Transducer Frequency - reeord the transducer frecuency.
11.
Single - place an "X" here in a single crystal transducer is used or N/A.
l 1
12.
Dual - place an "X" here if a dual crystal transducer is used or N/A.
l l
13.
Transducer Sice - record the transducer sice.
I I
14.
Weld No. - record the veld number.
l i
15.
System - record the system.
-l 16.
E::aciner - record ena=iner's signature, level af certification, and date of examination.
17.
Reviewer - record reviewer's signature, level of c deification, and date.
The reviewer shall be a NUSCO certified Level II or III.
18.
ANII - record the Authoriced Nuclear Inservice Inspector.
signature and date, i
Procedure NU-UT-5
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t-100-l I
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- r. _ :: i.:. :.:.
_.- < : - f :::-.,.;-
_:. ;n u. c : _.:: ac:s gnee;..un. :
number for ISI only.
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l 20.
Page of
- Record each page number of.the total number of pages.
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9.
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1 1
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Procedure NU -UT-5
.8
1 l
T.evision Change 1. tachr.ent Sheet Revision Section Chance 2
2.1.1 "1975 change to "1980" 5.2.4 Paragraph 5.2.4 deleted and renum-bered paragraph 5.2.5 to read 5.2.4 5.3.3 Paragraph 5.3.3 deleted and renum-bered paragraph 5.3.4 to read 5.2.4 Figure 2 Revised Figure 3 Revised 3
Figure 3 Added " Examination Data Sheet No.
and Page of to j
Figure 3
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_ ____ U_-UT-_5__.
Procedsrs______
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