ML19274E502
| ML19274E502 | |
| Person / Time | |
|---|---|
| Site: | Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 11/03/1978 |
| From: | LONG ISLAND LIGHTING CO. |
| To: | |
| Shared Package | |
| ML19274E499 | List: |
| References | |
| 80A0480, 80A480, NUDOCS 7903290020 | |
| Download: ML19274E502 (29) | |
Text
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PROCEDURE NO. 80A0480
SUBJECT:
AUTO RPV WELDS PAGE 1 0F 29 g '
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'w AUTOMATED ULTRASONIC EXAMINATION PROCEDURES , -
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l' FOR REACTOR VESSEL WELDS .
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.LONG ISLAND LIGHTING COMPANY ,
SHOREHAM NUCLEAR POWER STATION -
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Project M r. Y Date REV. NO. DATE NES - ' Z- 9 -W Mgr. ISI Level 111 Date 0 2-15-78 NES L.A U = ~//rs =/ir/7i ISIPro6ramMgr. Level lIi Date
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LILCO Y Y. S/S/99 Date Date
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PROCEDURE NO. 80A0480
SUBJECT:
AUTO RPV WELDS PAGE 2 0F g
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- IJ , 3, y RECORD OF REVISIONS -
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Rev.
Prep'd Aco'd Bv No. Date Description Reason -
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1 11/78 Revise: LILCO Cor.ments, CRA-569 a i[ 8 f( 7
5.6 &5.6.1-5.6.5 _ _.,
Add:
2.3 (2) Manual I;o.
80A0658 .,
2.2 (3) Manual tio. .
85A096- Y' -
7.5. 3 (1) the word " check' 7.54(2) the word " check' .
75.5(1) the word " check" '
8.1.l(3)"In the 0 straight beam...
calibration." .
8.2.l(3)" Verify that all points on the sweep .
line are within plus or minus St. of the ful: '
equalized response sweep lino."
8.2.2 (1)" . . .and horizon- .
tal positions."
- 8. 2. 2 (2) " . . . and the horizontal displacement is within the require. -
plus or minus 5%." i 1
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Delete:
8.1. l (3) " . . . entire . . .
(0-8 horizontal divi-sions).
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PROCEDURE NO. 80A0480
SUBJECT:
AUTO RPV WELDS PAGE 5 0F 29 (1) Nuclear Reflectoscope, Data Acquisition and ~ '
Control System, 854100-1, operating and '
Maintenance Manual, No. TM-73-14N, Rev. O, November, 1973 .,' . . r
. . s BWR Vessel Scanner, Operating and Maintenance , *
(2) ^
Manual No. 80A0658. - ' d t th (3) Data Analysis System, instruction Manual No. 85A096. /h, '
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3.0 PROCEDURE CERTIFICATION t
, .4-The examination procedures described in this document comply with Section XI of the ASME Boiler and Pressure Vessel Code, 1971 Edition including Summer 1972 Addenda, except where examination coverage is limited by part geometry or access. .
4.0 PERSONNEL CERTIFICATION 4.1 Personnel Certification Requirements 4.1.1 Each person performing ultrasonic examination governed by this procedure shall be certified in accordance with the
~~ References 2.1 (1) , 2;.1 (3) and 2.1 (4).
4.1.2 An examination crew shall consist of three or more members as needed. At least one member of each crew shall have a minimum qualification of Level 11 in accordance with the above referenced documents. The remaining member (s) shall consist of one with a minimum qualification of Level I and a mechanical / electronic technician.
4.2 Personnel Records 4.2.1 P.ecords of personnel qualification shall be maintained by Examination Contractor.
4.2.2 A copy of the examiner's certification summary and a current eye test as required by SNT-TC-1A shall be filed with each ~~~
permanent examination record, with a copy submitted to the -~
plant owner or his agent, prior to performing examination per this procedure.
5.0 EXAMINATION REQUIREMENTS 4
5.1 . Examination Frequency 5.1.1 The nominal examination frequency shall be 2.25 MHz for all straight beam and angle beam examinations.
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PROCEDURE NO. 80A0480
SUBJECT:
AUTO RPV WELDS PAGE 13 OF 29 8.2.2 Performance checks of search units and cables as required by '
Section 7.4.4 shall be performed as follows:
(1) Re-position search unit on the Calibration Standard at each test hole and observe maximum signal response amplitude and horizontal positions. q. ,
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(2) Verify that all amplitudes fall within 20% of the Equali=ed Response level and the horizontal displacement is within the required plus or minus 5%. .
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(3) If the response from any holej is beyond the allowed tolerance refer to Section 7.5.
J 8.2.3 Record time, and date on the Calibration Check Sheet and initial, and attach a tape printout showing high and low amplitude response.
Figure 10 is an example of the Calibration Check Sheet to be used with this procedure.
8.3 Angle Beam Sensitivity Correction For Planar Reflectors At Or Near The Far Surface 8.3.1 With instrument at Equalized Sensitivity setting, position search unit to obtain maximum amplitude from far surface notch.
8.3.2 Note amplitude from notch, when detectable, on DAC plot graph on appropriate Calibration Data Sheet.
8.3.3 This amplitude response may be used to facilitate subsequent evaluation of printout data.
9.0 EXAMINATION PROCEDURES 9.1 Examination of Reactor Vessel Welds 9.1.1 Refer to Figures 1 thru 5 and to Program Plan .for scan coverage and scan sequence information.
9.1.2 Cailbrate examination equipment as required by paragraph 8.1 or if more than 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> have elapsed since initial calibration, perform calibration check as required by paragraph 8.2. Scanning is to be performed at two times (2X) the Equalized Response sensitivity (6dB higher) .
9.1.3 Position scanner at reference points specified in 5.6.5 and begin automated examination sequence.
9.1.4 Using rubber stamp; log Plant Name, Calibration Data no. (Data Package No.) , Scan No. , Orientation (perpendicular or parallel) ,
and Magnetic and Paper Data Tape No. on the printer tape, sign and date the printer tape. Printout coordinated at the beginning dnd end of each scan.
e NUCLEAR ENERGY SERVICES. INC. -
PROCEDURE NO. 80A0480 SUBJECT. AUTO RPV WELDS PAGE 12 OF 29 (5) Program a TUC card to match the Distance Amplitude Curve established in (2) above.
(6) Program a DAC card to electronically equalize all TUC responses to the specified (80% FSH) amplitude over the entire depth range to be used during the examination. The sensitivity established here is the reference sensitivity.
(7) Record all information required on the Calibration Data Sheet (s).
The ultrasonic examiner or examiners shall sign the completed Calibration Data Sheet (s) noting their applicable SNT-TC-1A levels.
(8) Assign each TUC card a sequential I.D. number from the TUC Card Log and properly store each calibrated TUC Jard and DAC Calibration Data Sheet for subsequent use.
(9) Repeat steps (1) thru (9, for each of the instrument receiver sections used.
(10) Adjust amplitude recording gate levels to trigger at the specified limits (40% to 80%) if examinations are to be performed immediately.
8.2 System Calibration Check 8.2.1 Calibration checks of the examination system as required by Section 7.'4.3 shall be performed as follows:
(1) If not already running, equipment shall be allowed a minimum of
- 15. minutes warm-up.
(2) Refer to the proper Calibration Data Sheets for required instrument settings.
(3) Use appropriate TUC cards and DAC settings and perform a check of the examination instrumentation system including sensitivity level, depth gate function and position, and digital print system.
Verify that the amplitude response is within plus or minus 20% of the- Equalized Response obtained during initial calibration. Verify.
that all points on the sweepline are within plus or minus 5% of dh the full equalized response sweep line.
(4) If the response is beyond the allowed tolerance, refer to Section 7.5.
O Al e NUCLEAR ENERGY SERVICES, INC.
PROCEDURE NO. 80A0480
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SUBJECT:
AUTO RPV WELDS PAGE 11 OF 29 7.5.5 If any point on the Equalized Response has moved horizontally more than 5% of the sweep line from its original settings, the examiner shall (1) Mark all Weld Scan Data Sheets " VOID" since previous calibration check which have recorded indications. /h (2) Recalibrate examination system.
(3) Re-examine voided areas.
8.0 EXA*1IMATION SYSTEM CALIBRATION 8.1 Basic System Calibration for Anale and Straight Beam 8.1.1 Basic examination system calibration settings and parameters may Le established at any time prior to the examination of reactor vessel welds. Initial calibration shall consist of the following:
(1) Adjust instrument sweep range to correspond with the area to be covered during the examination. For initial calibration, the 1/4T hole indication from the calibration standard shall occur at the second horizontal screen position; the 1/2T and 3/4T indications shall occur respectively at the fourth and sixth horizontal screen positions. For angle beam examination where detection is possible, the far surface notch shall occur at or near the 8th position.
(2) Establish actual Distance Amplitude Curve for each angle and examination depth combination by plotting the signal response amplitudes from the 1/4T, 1/2T and 3/4T reference holes while the highest response hole indication is set at 80% of Full Screen Height (FSH) as shown in Figure 7.
(3) Adjust depth gate positions to cover the examination range.
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In the O straight beam channel, water path indications exist due to the construction of the search unit. Normally the first water path indication occurs at or near CRT position zero (0) .
This position of the water path indication will vary depending on examination thickness. Normal examination practice is to 7
monitor (set gates) from the trailing edge of the water path (entry echo) to the leading edge of the thickness back reflection.
As this is not necessarily CRT positions 0-8, the precise setting is best left to the examiner (s) at the time of system calibration.
(4) Connect TUC to proper channel and place one TUC pulse in each depth gate.
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PROCEDURE NO. 80A0480
SUBJECT:
AUTO RPV WELDS PAGE 10 0F 29 7.4.2 Instrnment vertical linearity checks for each of the receivers used shall be performed at the beginning of each day of examina-tion in accordance with the applicable sections of the procedure referenced in paragraph 2.1 (5). Data shall be recorded as required within the Check Sheet, Figure 10.
7.4.3 Examination system calibration checks using the TUC shall be
. performed at least at the beginning and at the completion of ecch 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> period of examination and/or at the change of examination persoanel, and at the completion of the examinations of each similar series of welds. Checks shall be made in accordance with Section 8.2.1 of this procedure. ,
7.4.4 Performance of the search unit sleds and coaxial cables shall bei verified each time the sled and cables are removed f rom the examination area. Should an examination scan overlap two shifts, these checks should not interrupt the scan but shall be performed as soon as possible after the scan is completed (Refer to paragraph 8.2.2). (No less than one check every 24 hrs) 75 Calibration Response 7.5.1 Calibration response shall be checked at the Equalized Response Level.
7.5 2 Signal response obtained during calibration check shall be within plus or minus 20% of that established during basic system calibration.
7 5.3 If any point on the Equalized Response has decreased by more than 20% of its amplitude, the examiner shall:
(1) Mark all Weld Scan Data Sheets " VOID" since previous calibration check. z@s (2) Recalibrate examination system.
(3) Re-examine voided area.
7.5.4 If any point on the Equalized Response has increased by more than 20% of its amplitude, the examiner shall:
(1) Recalibrate examination system.
(2) Re-evaluate all indications recorded since the previous calibration check at the corrected equalized response level.
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.c/ NUCLEAR ENE ACY St AviCEi+NC.
PROCEDURE NO. 80A0480
SUBJECT:
AUTO RPV WELOS PAGE 7 0F 29 5.3 Liquid Couplant 5.3.1 The ultrasonic couplant shall be demineralized water or a mixture of demineralized water and a suitable wetting agent such as Kodak Photo-Flo solutions or other and shall be recorded on the Weld Scan Data Sheet. ,
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5.3.2 The couplant shall be supplied in clean containers of suf-ficient quantity to perform the examination- 7 5.3 3 The couplant shall be pumped from the container to the trans-ducer fixtures through flexible tubing.
5.4 Surface Preparation .
All examination surfaces should be clean and f ree of dirt, weld spatter, etc., or any other condition which would interfere'with the examir.ation by impairing proper transmission of the sourd beam, or by preventing free movement of the search unit along the examination surface.
5.5 weld identification Each weld shall be located and identified per the appropriate weld map located in the Program Plan Book.
5.6 Reference point 5.6.1 Reference Points have been marked in accordance with Stone and Webster Specification SHI-397 to provide identification and locatio 2 of pressure boundary welds of the reactor vessel and closure head.
5:6.2 The RTV vertical and meridional reference points start at the highest point on the weld centerline.
Ib 5.6.3 The RPV circumferential weld reference points start at the 0 (CE Vessel) orientation of the vessel at the weld centerline.
5.6.4 The scanner assembly vertical and circumferential positions are
-specified in Table 2. ._
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5.6.5 The transducer vertical and horizontal starting positions are specified in Table 2.
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