ML20238E349
| ML20238E349 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 01/14/1986 |
| From: | PUBLIC SERVICE CO. OF COLORADO |
| To: | |
| Shared Package | |
| ML20238E343 | List: |
| References | |
| QCIM-39, NUDOCS 8709140289 | |
| Download: ML20238E349 (26) | |
Text
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$grylCO* Pusuc SERVICE COMPANY OF COLORADO TITLE: ULTRASONIC THICKNESS EXAMINATION OF MATERIALS y
RC e= p dk Qy g POEC 6 5 6 JAN 1 s 19Ph EF o TE E 1.0 PURPOSE l l This procedure describes the requirements of and the method used for the ultrasonic thickness examination of materials at Fort St. Vrain Station. 2.0 APPLICABILITY This procedure conforms to the latest editions and addenda of the applicable codes and applies to the Ultrasonic Thickness ; l Inspection of materials performed at Fort St. Vrain Station. l 3.0 GENERAL REQUIREMENTS 3.1 Personnel - All personnel performing and/or evaluating l ultrasonic thickness examinations shall be qualified minimum level I ultrasonics in accordance with procedure OCIM-4, or shall have received training in the theory ,and l the operation of digital thickness meters. 3.2 Electronic apparatus - A pulse echo ultrasonic thickness i instrument shall be used. 3.3 The base metal shall be free of weld spatter, surface i ' irregularities or foreign matter that might interfere with the examination. Where a weld surface interferes with the examination, the weld shall be prepared as neeced. P O o wesm.a.ma
OC8M-39
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Public FORT ST. VRAIN NUCLEAR GENERATING STATION 9 2 of 4 Service ~ rusuc sanvice courAmy or cotonAno 3.4 The calibration test ' piece must be made from a material that is ultrasonically similar to that which is to be measured. For this procedure, P-1 through P-5 materials shall be considered ultrasonically similar. The calibration test pieces actual thickness must be accurately known. 4.0 CALIBRATION 4.1 Calibration of DMX-1 4.1.1 Insure that the carat under NORM is lit. If not, depress the function pushbutton switch, as required, until the carat under NORM is lit. 4.1.2 To select millimeters if the IN indicator is lit or inches if the MM indicator is lit, depress the Increment pushbutton switch and the Decrement pushbutton switch simultaneously. 4.1.3 If the CAL indicator is not lit, depress the CAL pushbutton switch once. Observe that the CAL indicator lights. 4.1.4 Apply a small amount of couclant to the test piece { and couple the probe to the test piece. Observe ! that the coupling indicator lights and the display ' indicates a stable thickness indicator. 4.1.5 Using the Increment pushbutton switch and/or the I Decrement pushbutton switch as required, increment or decrement the display indication until the display indicates the thickness of the test piece. 4.1.6 If it is desired to record the acoustic velocity of ' the test piece, repeatedly depress the Function pushbutton switch until the carat under MAT'l is i lit. At this time, the display indicates the acoustic velocity of the test piece to which the i
- DMX was just calibrated. The acoustic velocity is !
displayed in units of X 108 in/sec (IN) or X 108 mm/sec (HM). Then depress function pushbutton switch once to light the carat under NORM. 4.1.7 Depress the CAL pushbutton once. Observe that the CAL indicator goes out. The calibration setting is now " locked" against accidental change. PonMIC)372 22 3M3
CCiM-39 Public FORT ST. VRAIN NUCLEAR GENERATING STATION pa 3 of 4
$$fVlC9* PUBUC SERVICE COMPANY OF COLORADO 4.2 Calibration of OM-2 4.2.1 Apply a small amount of couplant to the test piece and couple the probe to the test piece. Observe that the display indicates a stable thickness reading.
4.2.2 Using the adjustment screws inside the top of the unit, increment or decrement the display indication until the display indicates the thickness of the test piece. l 4.3 Calibration of USX-6, 7 or Ecuivalent i l 4.3.1 Employing an IIW block, step wedge or a reference i standard, set instrument's sweep range such that l CRT presentation represent the desired thickness ) l range as follows: ] l l < 1.0 inches thickness: l l I Set instrument sweep such that the fifth major l l division equals 1.0 inch, set delay such that back { l reflection is at the tenth major division. l > 1.0 inches < 5.0 inches l Set instrument such that the second major screen l l division equals 1.0 inch, set delay such that back j l reflection is at the fourth major division. ' l 4.3.2 Instrument's gain setting shall be established on j l the part/ component's base material such that the ' I l first back reflection screen height. is set at minimum of 80% full l 5.0 SCANNING ! 5.1 For the OMX-1 unit, insure that the carat under NORM is
. lit.
If not, depress the function pushbutton switch as required until the carat under NORM is lit. l 5.2 Apply a small amount of couplant to the examination surface and couple the probe to the surface. ' 5.3 Insure that the probe is essentially oriented at 90' to the examination surface to insure an accurate reading. Obtain the smallest stable reading. , i 5.4 Readings for pipe shall be taken every 90' unless otherwise specifled. SomediC)372 22 3843 u _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
QC8M-39 Issue 2 I Public FORT ST. VRAIN NUCLEAR GENERATING STATION Page 4 of 4
$4rVICG* Pusuc saRvica COMPANY OF COLORADO 6.0 RECORDS 6.1 A report and location drawing shall be generated and shall contain the following as a minimum:
6.1.1 Line no. 1 6.1.2 Location of readings 1 6.1.3 Meter used, including probe type j i 6.1.4 Calibration block used including material type 1 6.1.5 Calibration thickness 6.1.6 Calibration temperature l 6.2 Records shall be completed and administered per the requirements of procedure QCIM-2. ;
7.0 REFERENCES
7.1 ASME Section XI - Inservice Inspection i i 7.2 QCIM-2 - Preparation and Control Examination Test Reports of Nondestructive 7.3 QCIM Qualification and Certification of Nondestructive I Examination Personnel 8.0 COMMITMENTS i The step (s) and section(s) listed below may not be deleted i i without issuance of comparable controls. The procedure itself, if initiated as a result of commitment corrective action, may i not be deleted without issuance of comparable controls. 8.1 None i i i 1 FOAM sC)772 22 3043 _ _ _ _ _ _ _ _ _ _ _ _ - - _ _ _ _ _ _ _ _ _ _ - _ - - - - _ _ _ - _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ - - _ _ _ _ _-----_____--__a
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