ML18038A455

Provides Util Plans for Future Exam & Evaluation of Four Feedwater Nozzles Per NUREG-0619.Indications Conservatively Evaluated as Cracks Not Scratch Marks.During 1993 Refueling Outage,Sparger from Nozzle a Will Be Removed

ML18038A455
Person / Time
Site:	Nine Mile Point
Issue date:	03/21/1989
From:	Terry C NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RTR-NUREG-0619, RTR-NUREG-619 NMP1L-0374, NMP1L-374, NUDOCS 8903280112
Download: ML18038A455 (76)

Text

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~TED D~BU'llOAl DEMO%ST.'HOA SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8903280112 DOC.DATE: 89/03/21 NOTARIZED-NO FACIL:50-220 Nine Mile Point Nuclear Station, Unit 1, Niagara Powe AUTH.NAME'UTHOR AFFILIATION TERRY,C.D.

Niagara Mohawk Power Corp.

RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

DOCKET N

05000220

SUBJECT:

Provides util plans for future exam

& evaluation of re-exams of four feedwater nozzles.

DISTRIBUTION CODE:

A047D COPIES RECEIVED:LTR ENCL SIZE:

TITLE: OR Submittal: Inservice Inspection/Testing/Relief from ASME Code NOTES:

RECIPIENT ID CODE/NAME PDl-1 LA SLOSSON,M COPIES LTTR ENCL 1

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I NOIR 'IO ALL "RIDS" RECIPIENIS'IZASE HELP US I0 REMKZ WASTE CXWIACTIHE DOCUNEÃZ CXÃZRDL DESKf ROOM Pl-37 (EXT. 20079) ~ ELXHXNAXR KRR NME HUH DZSHKBVTIGN LISTS FOR DOCtlMEMIS YOU DON'T NEZDf TOTAL NUMBER OF COPIES REQUIRED:

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, LI7 NIASA A H V MOHAWK NIAGARAMOHAWKPOWER CORPORATION/301 PLAINFIELDROAD, SYRACUSE, N.Y. 13212/TELEPHONE (315) 474-1511 March 21, 1989 NMPlL 0374 U.S. Nuclear Regulatory Commission Attn:

Document Control Desk Washington, D.C.

20555 Re:

Nine Mile Point Unit 1

Docket No. 50-220 DPR-63 Gentlemen:

During the current refueling outage, Niagara Mohawk conducted re-examinations of the four feedwater nozzles in accordance with NUREG 0619.

These re-examinations identified approximately 25 indications in the vicinity of the nozzle to safe end weld of nozzle 'A'.

This letter provides Niagara Mohawk's plans for future examination and evaluation of these indications.

Although these indications might be caused by scratch marks made during sparger installation, we have conservatively evaluated them as cracks.

NUREG 0619 Section 4.3.2.3 states, "if recordable indications are interpreted to be cracks in any nozzle, proceed with sparger'removal',

PT of the nozzle bore and the nozzle blend radius,,and repair."

-Eighteen, of the twenty five indications were observed at 20 to 25% of the distance amplitude 'cor'rection,curve (DAC),

However the applicable ASME Code recording criteria is 50% DAC.

Therefore, these indications are not "recordable" and do not require further evaluation at this time.

The remaining indications appear,to be two separate flaws, one located in the nozzle and one located in'the safe end weld.

The indications appear at approximately 50% DAC.

The flaws are axially oriented and their size is well within the ASME Section XI acceptance criteria (a/t

= 4.7% and 7%

verses allowables of 11.02% and 11.23%).

The examination was performed using a 45 shear wave transducer calibrated on a nozzle mockup with a 5% T notch reflector.

The code permits calibration on notches up to 10%%d T (T is the nominal thickness of the calibration block).

Consequ'ently, the examination sensitivity exceeds the Code required sensitivity. If a 10% T notch had been

used, these indications may not have been recordable per ASME Section XI.

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0 Attached for your information and review are:

a copy of the examination procedure (Attachment A),

a drawing of the calibration block (Attachment B),

copies of the examination data (Attachment C),

and a plot of the indications (Attachment D), and Considering that" the examination was performed at a higher sensitivity than required by Code, that the indications are at the threshold of the recording

criteria, and that the indications will remain within allowable size for at least the next two operating cycles, Niagara Mohawk has determined that further evolution of these indications is not required at this time.

A fracture mechanics evaluation of these two flaws will be performed.

During the next refueling outage (1991),

Niagara Mohawk will ultrasonically re-examine these indications for evidence of growth, and will compare the results to the fracture mechanics evaluation.

During the subsequent refueling outage (1993),

Niagara Mohawk will remove the sparger from Nozzle 'A'nd perform a dye penetrant examination of the nozzle bore and inner radius.

This examination schedule is consistent with our NUREG 0619 commitment.

/'e will inform you of the 'results of the future examinations of these indications and any changes to our examination schedule.

Very truly yours, NIAGARA MOHAWK POWER CORPORATION C.

D. Terry Vice President Nuclear Engineering and Licensing KT/mjd 6870G xc:

Regional Administrator, Region I Mr. R. A. Capra, Director Ms.

M.

M. Slosson, Project Manager Mr.

W. A. Cook, Resident Inspector Records Management

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NUCLEAR ENERGY SERVICES, INC.

ISI FIELD CHANGE AUTHORIZATION 2/2/89 DATE ULTRASONICEXAMPROCEDURE FCR FERRITIC STEEL PIPING 5 COMPONENTS DOCUMENT TITLE:

FOR NINE MILEPOINT UNITI 4 2'OCUMENT NO:

EOA401 4 REV:

4 FIELD CHANGE NO:

FC4 ORIGINATOR:

W. MCKNIGHT.

DESCRIPTION OF FIELD CHANGE:

1.

ADD PAGES 16,17,18, 19

2. RENUMBER EXISTINGPAGES TO REFLECT ADDITIONOF 4 ADDITIONALPAGES

3. REPLACE PAGE 4 REASON FOR CHANGE:

TO INCLUDECALIBRATIONANDEXAMINATIONREQUIREMENTS FOR FEEDWAIERSAFE END EXAMSTO NUREG-0619 APPROVALS:

TITLE Pn ma<<

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C-V7 SIG AT RE r 8.F.

JC et/ cM DATE Z-'L-Z-z-+

2 8 Procedure requalification In accordance with NES Document 80A9084 Is

/

Is not (circle one) required.

COGNIZANT LEVEL III SIGNATURE Distribute to all Controlled Copy holders of affected document.

NOTE: A copy of this authorization shall be attached to the affected document until a subsequent revision Incorporates the field chango.

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NUCLEhR ENERGY SERVICES, INC DOCUMENT NO.

80A4014 PAGE ~

OF 19 Examination of Feedwater Nozzle Safe Ends per NUREG-0619 4

11.0 INTENT This section is applicable only to the examination of Feedwater Nozzle Safe Ends per NUREG 0619.

(Sections 11 thru 16) 11.1 AREAOF EXAMINATION See Figure 4 1 1.2 TYPE OF EXAMlNATION Nominal 45 degree angle beam shear wave techniques shall be applied on the outside surface (OD) to examine the WRV. Other angles and types of search units (WSY-70 etc.) may be used for evaluation purposes.

A 0 degree exam for interfering conditions is not required.

12.0 REFERENCES

NUREG-0619 NQAO letter CSI-89004 13.0 EXAMINATION REQUIREMENTS 13.1 The'ominal frequency shall be between 1.5 MHZ and 5 MHZ.

13.2 The examiner shall ensure that the required examination area as shown in'Figure 4 has been covered by 4 beam directions. The angle beam search unit shall be swivelled approximately 45 degrees during axial and circumferential scanning (22 1/2 degrees left and 22 1/2 degrees right).

14.0 REFERENCE SENSITIVITY LEYEL 14.1 The reference sensitivity level initially obtained directly from the calibration block shall be the sensitivity level for evaluating and recording all indications 14.2 During actual scanning the reference sensitivity shall be increased'a minimum of +6DB, 15.0 ANGLE BEAM CALIBRATION (Axial 8 Circumferential) 15.1 position the search unit to obtain maximum response from the 1/4 T hole.

Adjust the instrument controls to place the signal at 2 screen divisions on the CRT. Adjust the gain control to provide a signal amplitude of 80% FSH.

(+ or - 5% of FSH) 15.2 Without changing the gain setting, position the search unit for maximum response from the 3/4 T hole.

Adjust the instrument controls to place this signal at the 6th screen division.

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V I%4 IlUCLEhR ENERGY SERVICES, INC OOOU44ENT NO. ~4044 PAGE 49 OF 49 15.3 Repeat steps 1 and 2 until the 1/4 T and 3/4 T hole signals are aligned at the 2nd and 6th screen divisions respectively.

Mark the location and amplitude of the signals on the CRT.

Position the search unit to obtain maximum response from the 1 1/4 T hole and mark its location and amplitude on the CRT. Note:

If the 1 1/4 T hole falls beyond screen division 10, mark its amplitude at screen division 10.

If any point falls below 20% FSH create a secondary DAC.

15.4 Plot a DAC curve by connecting the points with a continuous line over the entire ekamination range.

15.5 Obtain a maximized signal from the ID notch and adjust the instrument sensitivity to bring its peak to the DAC line.

This is reference sensitivity.

15.6 Upon completion of calibration, ensure that all data and instrument settings are recorded on the Calibration Data Sheet.

16.0 RECORDING CRITERIA Indications shall be recorded and plotted as follows:

16

~ 1 Indications of suspected cracks at any amplitude.

16.2 Other non geometric indications in the inner 1/3 T that equal or exceed 20% of DAC.

16.3 Other non geometric indications in the outer 2/3 T that equal or exceed 50% of DAC.

16.4 Known geometric indications as shown in figure 5 do not need to be recorded or plotted.

All other geometric indications that are equal to or exceed 50% of DAC shall be confirmed either by review of the fabrication drawings, nondestructive examination records; or supplemental examination results (e.g. 0 degree or radiography).

This shall be documented on the data sheet.

16.5 The end points for length (L measurements) and depth (W measurements) shall be recorded equal to 50% of the maximum amplitude (6 db drop).

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ltUCLEAR EHiRGY St:RYlCES, IhC DOCUVEMT Np. 80A4014 ULTRASONIC EXAMINATIONPROCEDURES FOR FERRITIC STEEL PIPING AND COMPONENT WELDS

1. SCOPE 1.1 INTENT This procedure shall be used in conjunction with NES Procedure 80A2308 unless otherwise specified.

80A2308 contains all of the general requirements applicable to this examination procedure.

This procedure contains all of the specific application PC+~requirements for the examination of areas speciTied in Section 1.2.

The intent of this procedure is to cover the Weld and Required Volume (WRV) as specified in Section V and XI of the ASME Boiler and Pressure Vessel Code, 1983 edition through the Summer of 1983 Addenda.

This procedure shall be subject to periodic review and update.

If the procedure has not been reviewed within the past 2 years, the procedure shall be reviewed by the appropriate NES personnel and revised as necessary.

1.2 AREAOF EXAMINATION This document covers the ultrasonic examination procedures for:

1.

Ferritic steel pipe, fitting, pipe to fitting, pipe to safe end butt and longitudinal welds and ferritic components excluding vessels.

/~3 Note:

1.

For bimetallic safe end weld examinations refer to NES Procedure 80A4012.

2.

For electromatic valve body welds see Figure 3.

3. Examination of Feedwater Nozzle Safe Ends per NUREG-0619 found in Sections 11 thru 16.

1.3 TYPE OF EXAMINATION

/A+3

1. A 0 degree straight beam technique shall be applied on the outside surface (OD) of the volume through which angle beams will pass during examination of the WRV.

2: 45 degree angle beam shear wave techniques shall be applied on the outside surface (OD) to examine the WRV.

1.4 WELDCONFIGURATION 9

The typical weld configurations covered by this procedure are illustrated in Figure 1 and 3.

1.5 MATERIALS The piping, fittings, and components specified in this procedure are fabricated of ferritic steel.

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NUCLEAR ENERGY SERVICES, INC.

IS( FIELD CHANGE AUTHORIZATION 5/31/88 DATE FIELD CHANGE NO:

DESCRIPTION OF FIELO CHANGE:

REPLACE PAGES 5,6 AND8 ULTRASONC EXAMPROCEDURES FCR FERRlTIC STEEL PIPING 8 COMPONENTS OOOUMENT TITLE:

FOR NINE MILEPOINT UNITI & 2 OOOUMENT'O:

80A4014 REV:

4 FC-1 A.PENNANEN REASON FOR CHANGE:

1. TO CLARIFYEXAMINATIONREQUIREMENTS

2. TO INCI UDE CAUBRATIONINSTRUCTIONS FOR CAUBRATIONBLOCKS WITH 1/2 T HOLES ONLY.

APPROVALS:

TITLE Ro ec gN/C -

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SIGNATURE OIITE e-/.d'rocedure rsquallllcallen In accordance wllh NES Oocumsnr 80A9084 Is I ~ls nol (circle ons) required.

OOGNI2ANT LEVEL III SIGNATURE CW P~C R-Distribute to all Controlled Copy "holders of affected document.

NOTE: A copy of this authorization shall be attached to the affected document until a subsequent revision incorporates the field change.

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NUCLEhR EHERGY SERVICES, INC DOCUMENT NO.

80A4014 PAGE ~

OF~

2. REFERENCES FC I

1.

80A2308; NES Procedure, Ultrasonic Examination General Requirements 2.

80A2434, Ultrasonic Procedure for Thickness Measurement

3. PROCEDURE CERTIFICATION These examination procedures, in conjunction with NES Procedure 80A2308 comply with Section XI of the ASME Boiler and Pressure Vessel Code 1983 Edition, Summer 1983 Addenda, except where examination coverage is limited by part geometry or access.

4. PERSONNEL CERTIFICATION 1.

Each person performing ultrasonic examinations governed by this procedure shall be certified in accordance with documents referenced in NES Procedure 80A2308.

2.

Examination crews shall have a minimum of two members, (where ALARApermits).

At least one member of each crew shall have a minimum qualification of Level II in accordance with the above referenced documents.

The remaining member(s) shall have a minimum qualification of Level I.

5. EXAMINATION REQUIREMENTS 5.1 EXAMINATIONFREQUENCY The nominal examination frequency shall be 2.25 MHz for all straight beam and angle beam examinations.

Other frequencies may be used if such variables as material attenuation, grain structure, etc., necessitate their use to achieve penetration or resolution.

5. 2 EXAMINATIONANGLESANDCOVERAGE 1.

The examination volume shall include the weld metal-and adjoining base material for a distance of 1/4" beyond the edge of the weld crown within the inner 1/3 thickness only.

2.

r-c'+ I 3.

The Examiner shall ensure that the required examination volume has been covered by two beam directions.

For perpendicular examination of ferritic piping welds, this may be accomplished using a 45 degree shear wave 1/2 vee technique from two sides of the weld where weld contour allows scanning to proceed onto the weld crown. When complete coverage cannot be achieved using a 1/2 vee path, a 45 degree shear wave 1-172 vee technique may be used.

For parallel examinations, a 1/2 vee technique in two directions along the weld, and on the weld crown to examine the weld root shall be 'used.

Parallel examinations shall only be required on welds which had transverse indications, recorded on previous examinations.

Other angles may be utilized in addition to 45 degrees to overcome part geometry.

4. Straight beam examination of base and weld material (as described in paragraph 8.1) is required only when examination data from previous examinations (preservice or inservice) does not exist.

3

5 NUCLEhR ENERGY SERVICES, INC DOCUMENT NO.

80A4014 PAGE ~

OF NOTE: For fitting to fitting welds which exhibit non-parallel surfaces, the examination shall be restricted to 1/2 vee.

Fc "I 5.

In order to accurately plot indications, the OD and ID contour must be established in the area of the indication(s).

The OD contour shall be recorded with the use of a contour gauge.

The ID contour shall be recorded by performing thickness measurements to establish the location and shape of any existing counter bore, weld root, or other geometry.

Profiling shall be performed to the extent necessary for evaluation of the indication(s) and in accordance with reference 2.2.

6. EQUIPMENT REQUIREMENTS 6.1 EXAMINATIONCONTRACTORS EQUIPMENT The following test equipment or its equivalent, shall be provided by the Examination Contractor (as a minimum) for examination of welds specified in this procedure.

1.

Pulse 'echo ultrasonic instruments 2.

Search Units: 1/4" through 1" Dia., 2.25 MHz, 0 degrees straight beam 3.

Search Units: 1/4: through 1" Dia.,

5.0 MHz, 0 degrees straight beam

4. Transducers:

2.25 MHz (all sizes) for angle beam wedges 5.

Wedges:

45 degrees and 60 degrees angle beam, to accommodate transducers

6. Any-additional angle.wedges to aid in examination or evaluation 7.

Coupiant 8.

Miniature angle beam verification block

9. Thermometer (calibrated)

10. Camera

11. Post-examination cleanup

6. 2 PLANTS OWNER'S EQUIPMENT The Plant Owner, or his Agent, shall provide the following service facilities and equipment as required:

1. Scaffolding

2. Water, air and electricity

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~ 1 NUCLEhR ENERGY SERVICES, INC DOCUMENT NO.

80A4014 PAGE 8

OF 2.

3.

E Refer to NES Procedure 80A2308 for the appropriate horizontal linear range calibration (metal path).

Obtain maximized signal responses from the notches and mark the signal response positions on the instrument's CRT screen.

Maximize the signal from the notch producing the highest response and set its amplitude to 80% FSH.

Without changing sensitivity settings, maximize remaining notch. Indications and mark their peak amplitudes on the CRT screen, and on the Calibration Data Sheet.

If any signal response falls below 20% FSH, that response shall be remeasured and recorded.

This is the reference sensitivity for a secondary DAC. The shape and slope of both DAC's shall be recorded on the Calibration Data Sheet.

4 5.

6.

7.

Plot a DAC curve by connecting the locations (marked on the CRT) with a continuous line extended to cover the full examination range.

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This is the reference sensitivity level ~

Record all sensitivity control settings on the appropriate Calibration Data Sheet.

Upon completion of calibration, ensure that all data and instrument settings are recorded on the Calibration Data Sheet.

The examiner(s) shall sign the completed data sheet, noting applicable NDE certification levels.'.2.2 1/2 VEE TECHNIQUE One half vee calibration shall be accomplished as follows:

1.

Refer to NES Procedure 80A2308 for the appropriate horizontal linear range calibration (metal path).

2.

Select a search unit of such angle and size that the root of the weld wiil be within the 1/2 vee path.

When the calibration block has only a 1/2 T side drilled hole the DAC curve shall be established utilizing the 1/2 T and 1-1/2 T holes.

3.

The shape and slope of the DAC curve is established by obtaining maximized responses from the side drilled holes within the 1/2 vee path.

FC ~I NOTE:

4.

5.

Set the highest amplitude signal at 80% FSH and mark its amplitude and position on the CRT screen.

Without changing sensitivity, maximize the signal(s) from the remaining hole(s) and mark the amplitude(s) at the appropriate position(s) on the CRT.

Note signal response amplitudes and positions on the CaHbratlon Data Sheet.

Plot a DAC curve by connecting lhe locations (marked on the CRT) with a continuous line extended to cover the full examination range.

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ULTRASONIC EXAMINATIONPROCEDURES FOR FERRITIC STEEL PIPING AND COMPONENT WELDS FOR NIAGARAMOHAWK PO%'ER CORPORATION NINE MILEPOINT, UNITS I AND 2

'DO NOT USE AFTER IZ/28/89 SUBJECT TO PERIODIC REVIE'iV

.oiect Application 5530-ISI Copy No Asstgnea To APPROVALS TITLE / DEPT.

- SIGNATURE - DATE REV NO PREPARED BY T Level III Project Mana er Engineering De t.M r.

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REVISION LOG NUCLEAR ENERGY SERVICES, INC.

DOCUMENT NO PAGE OF Rsv.

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DATE P>GE NO.

DESCRIPTION APPROVAL 1

2/13/81 4

Para.

1.1 added last sentence Para.

2.2 deleted Section 5 revised Para.

6.1 revised Para.

6.2(5) changed standard to block Para.

7.2 deleted and renumbered Para.

7;2.1 changed standard to block Para.

8.1 added...at least 80%

FSH 4/4/84 10 Para.

8.3.2(2) revised Added parallel scan CRA 1710 Reworded title Added "En ineerin De t.

M r." to si nature title Para.

1.2.2 reworded Para.

1.3.1 throu h 1.3.3 reworded and renumbered Para.

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DOCUMENT NO.

SOA0010 NUCLEAR ENERGY SERVICES PAGE OF ULTRASONIC EXAMINATIONPROCEDURES FOR FERRITIC STEEL PIPINC AND COMPONENT WELDS

1. SCOPE 1.1 INTENT This procedure shall be used in conjunction with NES Procedure SOA2308 unless otherwise specified.

80A2308 contains all of the general requirements applicable to this examination procedure.

This procedure contains all of the specific application requirements for the examination of areas specified in Section 1.2.

The intent of this procedure is to cover the (Veld and Required Volume (lVRV) as specified in Section XI of the ASME Boiler and Pressure Vessel

Code, 1983 edition through the Summer of 1983 Addenda, for inservice inspections per figure IWB-2500-8.

This procedure shall be subject to periodic review and update.

If the procedure has not been reviewed within the past 2 years, the procedure shall be reviewed by the appropriate NES personnel and revised as necessary.

1.2 AREA OF EXAMINATION This document covers the ultrasonic examination procedures for:

Ferritic steel pipe, fitting, pipe to fitting, pipe to safe end butt and longitudinal welds and ferretic components excluding vessels.

Note:

For bimetallic safe end weld examinations refer to NES Procedure SOA0012.

1.3 TYPE OF EXAMINATION l.

Volumetric examinations shall be performed using ultrasonic pulse echo nominal 05 angle beam shear wave and 0 straight beam techniques (when 0

0 required) applied to the outside surfaces (O.D.) of the piping.

2..Other beam angles may be used as alternative examination techniques when they facilitate examination or evaluation.

Any such use shall be documented.

3.

The examinations shall be performed manually using contact search units.

1.0, iVELD CONFICURATION The typical pipe weld configurations covered by this procedure are illustrated in Figure l.

1.5 MATERIALS The piping, fittings, and components specified in this procedure are fabricated of ferritic steel.

FORM INES 205 2/80

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NUCLEAR ENERGY SERVICES OOCVMENT NO, PAQE 80AOOIO 5

12 OF

2. REFERENCES 80A2308; NES Procedure, Ultrasonic Examination General Requirements

3. PROCEDURE CERTIFICATION These examination procedures, in conjunction with NES Procedure 80A2308 comply with Section XI of the ASME Boiler and Pressure Vessel Code 1983 Edition, Summer 1983 Addenda, except where examination coverage is limited by part geometry or access.

0. PERSONNEL CERTIFICATION 1.

Each person performing ultrasonic examinations governed by this procedure shall be certified in accordance with documents referenced in NES Procedure 80A2308.

2.

Examination crews shall have a minimum of two members,'(where

ALARA, permits). At least one member of each crew shall have a minimum qualification of Level II in accordance with the above referenced documents.

The remaining member(s) shall have a minimum qualification of Level I.

4

5. EXAMINATIONREQUIREMENTS 5.1 EXAMINATIONFREQUENCY The nominal examination frequency shall be 2.25MHz for all straight beam and angle beam examinations.

Other frequencies may be used if such variables as material attenuation, grain structure, etc.,

necessitate their use to achieve penetration or resolution.

5.2 EXAMINATIONANGLES AND COVERAGE 1.

The examination volume shall include the weld metal and adjoining base material for a distance of 1/0" beyond the edge of the weld crown within the inner 1/3 thickness only.

2.

The Examiner shall ensure that the required examination volume has been covered by two beam directions.

For perpendicular examination of ferritic piping welds, this may be accomplished using a 05 shear wave 1/2 vee

. technique from two sides of the weld where weld contour allows scanning to proceed onto the weld crown.

When complete coverage cannot be FORMINES 205 2/80

4

~ I C

tt rl~l

NUCLEAR ENERGY SERVCGS DOCVMfNT NO.

PAGE SOA4010 6

OF achieved using a 1/2 vee path, a 05 shear wave l-l/2 vee technique may 0

be used.

For circumferential examinations, a

1/2 vee technique in two directions along the weld, and on the weld crown to examine. the weld root shall be used.

3.

Other angles may be utilized in addition to 05 to overcome part geometry.

NOTE:

Straight beam examination of base and weld material (as described in paragraph 8.1) is required only when examination data from previous examinations (preservice or inservice) does not exist.

For fitting to fitting welds which exhibit non-parallel

surfaces, the 3

examination shall be restricted to 1/2 vee.

6. EQUIPMENT REQUIREMENTS 6.1 EXAMINATIONCONTRACTOR'S EQUIPMENT r

The following test equipment or its equivalent, shall be provided by the Examination Contractor (as a minimum) for examination of welds specified in this procedure.

1.

Pulse echo ultrasonic instruments 2.

Search Units: I/O" through 1" Dia., 2.25MHz, 0 straight beam 3.

Search Units: I/O" through 1" Dia., 5.0MHz, 0 straight beam 0.

Transducers:

2.25MHz (all sizes) for angle beam wedges 5.

Wedges: 05 and 60 angle beam, to accommodate transducers 0

0

~, 6.

Any additional angle wedges to aid in examination or evaluation 7.

Couplant

8. -"Miniature angle beam verification block 9.

Thermometer (calibrated) 10.

Camera 11.

Post-examination cleanup.

6.2 PLANTS OWNER'S EQUIPMENT The Plant Owner, or his Agent, shall provide the following service facilities and equipment as required:

1.

Scaffolding 2.

Water, air, and electricity FORM >NGS 205 2180

~ I

.I 4b 4y, H

~ '

II

~ 1 NUCLEAR ENERGY SERVICES DOCUMENT NO.

PAGE 80AOO IO 7

12 OF 3.

Adequate temporary lighting N

0.

Moving or liftingdevices 5.

Calibration Blocks (Listed in Program Plan) 6.

Test surface preparation (cleaning and finishing) 7.

Radiation monitoring and shielding devices 8.

Final cleanup.

7. CALIBRATIONREQUIREMENTS

\\

7.1 CALIBRATIONDATA PACKAGES Calibration Data Packages shall be numbered 0010-1, 0010-2, 0010-3, etc., and shall be signed by the Examiner(s) upon completion noting.applicable NDE Certification Levels.

A Calibration Data Package shall consist of a Calibration Data Sheet(s) and an Indication Report Sheet, as required.

7.2 REFERENCE SENSITIVITYLEVEL The reference sensitivity level shall be the distance amplitude curve initially obtained directly from the calibration block and shall be the sensitivity level for evaluating and recording all indications.

2.

During actual weld scanning, the reference sensitivity shall be increased at least 6dB, but not more than 10dB.

The actual scan'sensitivity shall be recorded on the data sheet.

I

8. EXAMINATIONSYSTEM CALIBRATION 8.1 STRAIGHT BEAM CALIBRATIONFOR BASE AND WELD MATERIAL Straight beam calibration for all base and weld material through which the angle beams will pass shall be performed at a sensitivity level which gives an initial back reflection signal amplitude from the component of at least 80% Full Screen Height (FSH).

Two back reflections from the component shall be maintained on the CRT screen during straight beam calibration.

8.2 ANGLE BEAM CALIBRATION 8.2.1 I-l/2 Full Vee Techni ue One and one-half vee path calibration shall be accomplished as follows:

FQRM NNES 205 2/80

~ 4 hf "I

jr c

qp

NUCLEAR ENERGY SERVICES DOCUMENT NQ, PAQQ 80AOOll 8

()F 12 l.

Refer to NES Procedure 80A2308 for the appropriate horizontal linear range calibra'tion (metal path).

2.

Obtain maximized signal responses from the notches and mark the signal response positions on the instrument's CRT screen.

3.'aximize the signal from the notch producing the highest response and set its amplitude to 8096 FSH.

Without changing sensitivity

settings, maximize remaining notch indications and mark their peak amplitudes on the CRT screen, and on the Calibration Data Sheet. If any signal response falls below 2096 FSH, that response shall be increased to 2096 FSH and the previous signal response shall be remeasured and recorded.

This is the reference sensitivity for a secondary DAC.

The shape and slope of both DACs shall be recorded on the Calibration Data Sheet.

5 Plot a DAC curve by connecting the locations (marked on the CRT) with a continuous line extended to cover the fullexamination range.

6.

This is the reference sensitivity leveL Record all sensitivity control settings on the appropriate Calibration Data Sheet.

7.

Upon completion of calibration, ensure that all data and instrument settings are recorded on the Calibration Data Sheet.

The examiner(s) shall sign the completed data

sheet, noting applicable NDE certification levels.

8.2.2 I/2 Vee Technigue One half vee calibration shall be accomplished as follows:

1.

Refer to NES Procedure 80A2308 for the appropriate horizontal linear range calibration (metal path).

2.

Select a search unit of such angle and size that the root of the weld willbe within the 1/2 vee path.

3.

The shape and slope of the DAC curve is established by obtaining maximized responses from the 'side drilled holes within the 1/2 vee path.

0.

Set the highest amplitude signal at 8096 FSH and mark its amplitude and position on the CRT screen.

Without changing sensitivity, maximize the signal(s) from the remaining hole(s) and mark the amplitude(s) at the appropriate position(s) on the CRT.

Note signal response amplitudes and positions on the Calibration Data Sheet.

5.

Plot a DAC curve by connecting the locations (marked on the CRT) with a continuous line extended to cover the'full examination range.

FORhl ~ RES 205 2180

~ ~

l kJ l.

l.i

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~

~

\\

NUCLEAR ENERGY SERVICES DOCUMENT NO.

PAQQ 80AOO I0 9

QF a2 6.

Obtain a

maximized signal from the ID notch and adjust the instrument sensitivity to bring its peak to the DAC line (mark

~2 position on the CRT).

7.

This is the reference sensitivity level.

Record all sensitivity control settings on the appropriate Calibration Data Sheet.

8.

Upon completion of calibration, ensure that all data and instrument settings are recorded on the Calibration Data Sheet.

The Examiner(s) shall sign the completed data

sheet, noting applicable NDE Certification Levels.

8.3 ANGLE BEAM CALIBRATIONCHECKS Calibration checks are to be performed in accordance with NES Procedure 80A2308.

9. EXAMINATIONPROCEDURES 9.1 STRAIGHT BEAM EXAMINATIONOF BASE AND WELD MATERIAL Straight beam examination of all base and weld material shall be performed at the sensitivity level established in paragraph 8.1.

9.2 ANGLE BEAM EXAMINATIONOF WRV 2.

3.

Angle beam examinations of the WRV shall be performed at a scanning sensitivity level, a minimum of + 6dB, but not more than IOdB greater, than the calibrated reference sensitivity level.

The search unit shall be swivelled (approximately 20 each way) as it is moved along a rectilinear scan pattern to ensure maximum coverage.

If

" the search unit cannot be swivelled, it shall be overlapped at least 50%.

For the locations and the numbers of the welds, refer to the Program Plan.

Examinations shall not be considered complete until all recordable indications have been evaluated.

IO. RECORDING CRITERIA All indictions shall be recorded and evaluated in accordance with NES Procedure 80A2308.

FORM ~NES 205 2/80

'g I 1 ~

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NUCLEAR ENERGY SERVICES, INC.

DOCUMENT NO.

80A4014 PAGE PF 12 C

1/4+

1/4 II (PQk)

(60Q)

• pO *.

A 45O 50 45Q E

B (60O) 0Q*

(p *)

1/3 T c

A B

C T. =

W Exam Volumne A-B-C-D 60 Perpendicular Scan Path (if required) 45Q Perpendicular Scan Path 45 Parallel Scan Path (W +.25" on each side of weld)

T1LLc9Qless Weld Width po Base Material NZE:

All Scan Paths must include the weld width.

Refer tQ Figures 2 and 3

for'Scan Paths.

Weld width is detezn1ined hy the weld rratal Qn the O.D. surface.

FIGURE 1 TYPICAL WELD CCNFIGURIKION FORM <<NES 205 2/80

l 0

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NUCLEAR ENERGY SERVICES. INC.

t OQCUMENT NO.

PQGI QF 12 12 SCrQl PATH 1 1/2 VEE SURF~

DISTANCE 45o SURFACE DISZANM 60&

.125" to

.250" W + 1.00" W + 1.75"

.251" to

.375"

.376" to

.500" W + 1.50" W + 1.75" W + 3.00"

..501" to

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.75Z'o

.875"

. 876" to 1.000" W + 3.00" W + 3.25" W+ 5.5 1.001" to 1.125" 1.126" to 1.375" W + 3 75" W + 4.50" W +

W + 7.50"

,1.376" to 1.500" W + 4 75" 1.501" to 1.625" 1.626" to 1.750" W + 5.25" W + 5.50" W+9 00" w + 9.50" 1 751" to 1.875" 1.876" to. 2.000" W + 6.00" W + 6.25" W + 10.25" W + 10.75" FORHKA:

45

='W+ 3T+ 1/4" 60o = W +

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ULTRASONIC EXAMINATION CALIBRATION SHEET v

Data pkget 4014-89A-6 Page 1

of ~

Exam Item:

Procedure:

Rev./F.Cet

Title:

INSTRUMENT SETTINGS SEARCH UNIT Calibration Block NMP1-10-S

-1 erial 7 76-4169 Serial

¹ 30055 Black Thickness

,903'FG./Madel

¹ KKB-USK-7 Swee Len th 1.44 Swee Dele 7.80 Brand Fre uenc Size/S ha e

KBAEROTECH

2. 5mH 375 ROUND Corn

. Thickness Block Tem erature Cam

. Tem erature

.85 66 F

78 F

ulse Len th/Oam Fl B

Ran e

.5 St le/T e

Fixture GAMMA Thermometer Surface NOV-88-0 0 C/Gate Re'ect MIN acks de Select SING/R S

Coarse Gain 0

Fine Initial Callb.

Intermediate Intermediate Intermediate Final Calib 1025 1307 1642 2003 2237 Calibration Date 2/3/89 INSTRUMENT LINEARITY 50 6

78' Calibration Checks:Time Cable Cau lant Batch 100 90 80 70 60 50 40 30 20 10 0

0 2

3 OAC I

I 5

6 7

8 9

10 AMPLITUDE LINEARITY 80- 6

~

40 80

~ 12 ~

20 40+ 6 a

80 20+12 s 78 CRT Calibrated In Each Ma or Screen Oiv.

Scan An le Mess.

An le Mode Calibration Scan Area 45 DEGREES c'/c c~~ r~

DAC Reflector

%FSH Position 80'/o 50'/

38 /o 2

Exam Item RV-3-566-A-SEB Remarks Comments/Reasons for Incomplete Exams WA RS ND~

rer AN PATH0 TRUCTED TH R UP XE SPA - oc'/

SHOWN IN ROC DUR Fl/?IJZ REFER TO 2434-89A-14 FOR CA IBRATIONFOR WELD PROFILING C

ds n

-2 p, ivcA +~s C

At%

+e rror Examiner 1:

r'ILLIAM MCKNIGHTLEVELIII aA/aC A N I I NIYIPC - QA DE/ I.

QU ITY GOHT N

~ ACCDrTKD 3 -/$'tff SIGNAT RE%DATE w'v ur ) ~ I-Level: ~

Deke: ~Z/e/

Examiner 2:

Level: ~

Date:

OBERTP WSKILEVELI +gi~r-0 trt,~~ ~~)

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REVIEWER: ~F /iMrJ.5 LEVEL:~DATE:

gi <~f>rg csr - IA'eV IarVroce/re'/r g 7 g NMPC USE ONLY WR¹ NCR¹ /-&-2C~S TRAVELERgg gr 0/9 WELD ACCEPTABLE?

YES'Ogp/

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OISP.

REQ.

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%of DAC

~c/M86C 1~ 50 2

50 3

50 4

40 5

40 6

40 7

20 8

20 9

20 10 25 11 25 12 20 13 40 14 25 15 20 16 20 17 20 18 20 19 20 20 20 21 20 22 20 23 20 24 20 25 20

.15" CW

.35" CW

.55" CW

.70" CW

.80" CW

..70" CW 2.50" CW 4.0" CW 4.4" CW 6.7" CW 7.9" CW 8.4" GW 9.4" CW 10.25" CW 11.1" CW 13.4" CW 18.6" CW 1.1" CCW 2.5" CCW 5.85" CCW 7.4" CGW 10.85" CCW 11.9" CCW 13.7" CGW 15.75" CCW 4.7" 4.5" 4.25" 2.45" 2.1 0" 1.75" 2.1 5" 4.05" 2.7" 2.1" 4,4" 2.6 2.2" 4.2" 3.3" 2.4" 2.2" 3 9" 2.6" 4.6" 2.9" 2.6" 3.1" 2.05" 4.3" 5.0" 4.7" 4.5" 2.8" 2.40" 2.05" 2.35" 4.25" 2.9" 2.3" 4.6" 2.8 2.4" 4,4" 3.5" 2.6" 2.4" 4.1" 2.8" 4 8 II 3.1" 2.8" 33 2.25" 4.5"

.30"

.20"

.25"

.35"

.30"

.30"

.20"

.20"

.20"

.20"

.20"

.20"

~20"

.20"

.20"

.20"

.20"

.20"

.20"

.20"

.20"

.20"

.20"

.20"

.20" The above indications were seen with both a 45 degree shear wave exam and a WSY-70 ID creeping wave exam (Both CW & CCW scanning directfons}. Based on UT data these indications originate at the ID. A 0 degree exam was performed and could not find any geometric reason for these indications.

The notch used for calibration is half the code allowable size.

If a larger code allowable size notch were used and the code recording criteria were used (50% of DAC) these indications would not be recordable.

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