ML20070M771

Ultrasonic Exam for Detection of Intergranular Stress Corrosion Cracking

ML20070M771
Person / Time
Site:	FitzPatrick
Issue date:	10/23/1981
From:	EBASCO SERVICES, INC.
To:
Shared Package
ML20070M761	List: ML20070M759 ML20070M771 ML20070M781
References
RTR-NUREG-0313, RTR-NUREG-313 JAF-UT-5, NUDOCS 8301250326
Download: ML20070M771 (17)

Text

.---------._____._.._..__..__.__._____.___._____m

' if

+

J I

ESASCO SERVICES INCORPORATED NO l

Two worm Trade Center. New York, N Y.10048 1

l l

l ULTRASONIC EXAMINATION FOR THE DETECTION OF INTERGRANULAR j

STRESS CORROSION CRACKING f

4 l

i J.A. FITZPATRICK NUCLEAR POWER PLANT t

I O

PROCEDURE NO. JAF-UT-5 i

l i

O 8301250326 830119_

PDR ADOCK 0500033a p

PDR

r:Asco scavices sucscescaTre pace 1 or 15 QUALITY AS$UR ANCE ENGINEECING INSERVICE INSPECTION PROCEDURE NOdAF-UT-5 m.m.,s ULTRASONIC EXAMINATION FOR THE DETECTION OF O

INTERGRANULAR STRESS CORROSION CRACKING

" ~ '," NsIow 10/23/81 r

PREPARED by R E v tE WE D SV APPROVED kV REPLACES g3SgE OF M

N/A

f. m g

REv PREPARED Approved 0

7/ d/$

1.0 SCOPE 1.1 This procedure defines the requirements for manual ultrasonic examination of stainless steel piping for intergranular stress corrosion cracking.

1.2 This procedure covers both straight beam and 45 angle beam shear wave techniques applied to the outside of the austenitic stainless steel piping.

2.0 APPLICABLE DOCUMENTS, CODES AND STANDARDS 2.1 The following documents form a part of this procedure to the extent spec-ified herein.

2.1.1 Ebasco Documents 2.1.1.1 Ebasco Services Incorporated Procedure for Qualification and Certification of Nondestructive Examination Per-sonnel.

2.1.2 Codes and Standards 2.1.2.1 American Society of Mechanical End neers (ASME) Boiler i

and Pressure Vessel Code,

a.Section III, Nuclear Vessels, 1974 Edition including Code case Nos. 1698, June "75" and 1705, March "76".

b.Section XI, Inservice Inspection of Nuclear Reactor Coolant Systems,1974 Edition, Summer "75" Addenda,

c.Section V, 1974 Edition, Sum:rer "75" Addenda.

2.1.2.2 American Society for Nondestructive Test (ASNT)

a. SNT-TC-1A, Nondestructive Testing Personnel Quali-fication, 1975 Edition.

3.0 DESCRIPTION

3.1 The examination volume and area where IGSCC is typically detected is the area between the weld root and the outboard edge of the weld heat affected zone.

The typical weld configurations and areas of IGSCC cc"u d by this procedure are shown in Figures 1 and 2.

ErASCS SEIVICES 1%CFPoIATE3 3:ARE 2 or 15 QUALITY A$$URANCE ENGINEERING f

lHSERVICE INSPECTION rnocEcunE NodAF-UT-5 im Am-n ULTRASONIC EXAMINATION FOR THE DETECTION OF

'""",,,g,,,,

m INTERGRANULAR STRESS CORROSION CRACKING mEvisso" 10/23/81 REPLACES ISS U E OF N/A REW PREPARED APPROVED M[ b[

0 4.0 REQUIREMENTS 4.1 Personnel 4.1.1 All personnel performing the nondestructive examinations in accordance with this procedure shall be qualified and certified to at lease Level I in accordance with SNT-TC-1A and Ebasco Services Incorporated Procedure fo r Qualification and Certifi-cation of Nondestructive Examination Personnel.

NOTE:

At least one member of each examination crew shall have a minimum qualification of Level II.

4.2 Equipment 4.2.1 Pulse-echo ultrasonic equipment (Krautkramer USM2, USL-38, Sonic MK1, or equivalent)shall be used. The ultrasonic instru-ment shall be equipped with a fine gain and/or attentuation con-trol graduated in units no larger than 2 db.

()

4.2.2 Straight beam examination shall be performed using a longitudinal wave search unit having a nominal frequency of 2.25 MHz or 5 MHz.

4.2.3 Angle beam examinations shall be performed using a 45

(+ 30) angle beam shear wave search unit having a nominal frequency range of 1.5 MHz to 5 MHz.

For search unit aize see Table 3.

NOTE: When performing initial calibration, beam angle shall be checked on the IIW block and noted on the calibration data sheet.

4.2.4 At the discretion of the Level III, transducers of different size, shape, and frequency may be used as permitted by Section V, Article 5 Para. T-535 and T-536.

These changes shall be documented on the data sheets.

4.2.5 Equipment certification shall be transmitted to the customer.

4.3 Calibration Blocks 4.3.1 Piping calibration blocks shall be those provided by th; customer (PASNY).

4.3.2 Standard calibration blocks such as IIW blocks, miniature angle beam, DSC blocks, etc. may be used to establish distance (metal path) during calibration.

(~N NOTE:

The piping calibration blocks shall be within 250 of the

(.

component temperature.

ccAu:s se:vic:s acacromarco Pare 3 er 15 QUALITY AS$URANCE ENGINEERING INSERVICE INSPECTION PRoCEpuRE NO. JAF-UT-5 "28^/8 2 7s ULTRASONIC EXAMINATION FOR THE DETECTION OF INTERGRANULAR STRESS CORROSION CRACKING

" ~ '"c E s'ow'*

10/23/81 n

rap 6aess issue or N/A REW PREPARED AppngygD h

0 4.4 Surface Preparation and Couplant 4.4.1 The contact surface shall be clean and free of dirt, dust, weld splatter, loose scale or other material which would interfere with free movement of the transducer or impair transmission of ultrasonic energy into the material.

The weld surface shall also merge smoothly into the surfaces of the adjacent base materials.

4.4.2 Glycerine or approved couplant shall be used in sufficient quan-tity to maintain continuous sonic contact.

The couplant used shall be noted on the calibration data sheet.

4.5 Scanning Requirements 4.5.1 The scanning speed shall not exceed 3 inches persecond.

4.5.2 The scan path of the search unit shall overlap adjacent scans by a minimum of 25% of the search unit width.

()

4.5.3 Scanning shall be perfonned at a gain setting of at least 2 times (6db) the reference level except for straight beam exam-Ination set up on a back reflection.

4.5.4 Examination areas shall include the entire circumference of the selected circumferential welds and at least a one' foot length of each longitudinal weld intersecting the circumferential weld.

j 4.6 Weld __ Identification

4. 6.1 Prior to examination, the welds shall be identified in accordance with the weld identification plan identified in the Inservice Inspection Program.

5.0 CALIBRATION 5.1 Instrument Calibration 5.1.1 At the beginning of each day, the ultrasonic instrument shall be checked for amplitude linearity and amplitude control linearity as follows:

O l

l l

roesca services :cccrorar:3 paea 4 or 15 QUALITY A55UOANCE ENGINEE7. LNG INSERVICE INSPECTION pnocEpuRE No.JAF-UT-5 i n. a m.n

E ULTRASONIC EXAMINATION FOR THE DETECTION OF INTERCRANULAR STRESS CORROSION CRACKING

" ~ ',", #s^o',' '

10/23/81 REPLACES ISSU E OF N/A REW PREPARED appnOWED l {}$

0 A.

Amplitude Linearity (1) Position a search unit (transducer) on the reference standard so that indications from both the 1/2T and 3/4T holes are visible.

(Other reflectors which provide the 2 to 1 ratio required in (2) may be substituted).

(2) Manipulate search unit to establish a 2 to i ratio of ampli-tudes between the two indications with the larger at 80% FSH.

(3) Without moving search unit, adjust sensitivity to run the higher response from approximately 100% to 20% FSH in 2 db steps (10% if fine control available).

(4) Read and record the relative amplitudes of the two indications to the nearest 1%.

(5) If the smaller indication does not fall within 5% FSH or 50%

of the larger indication, the instrument shall not be used for examinations until corrected.

B.

Amplitude Control Linearity (1) Position a search unit (transducer) on the reference standard to obtain an 80% FSH indication from the 1/2T hole.

(any re-flector providing 80% FSH may be substituted).

(2) Using amplitude control, decrease signal amplitude by 6 db and by 12'db to obtain nominal 40% FSH and 20% FSH signals.

Read and record actual signal amplitudes to closest 1%.

(3) Obtain a 40% FSH indication from the 1/2T hole and it. crease amplitude with the amplitude control by 6 db to obtain a nominal 80% signal.

Read and record as in (2).

(4) Obtain a 20% FSH indication from the 1/2T hole and increase amplitude with the amplitude control by 12 db to obtain a nominal 80% FSH signal.

Read and record as in (2).

(5) If the indications obtained in (2), (3) and (4) are not within

+ 20% of nominal, the instrument shall not be used for exam-ination until corrected.

O

reasca se vices increonaco parc 5 cr 15 QUALITY A55URANCE ENGINEECING INSERVICE INSPECTION PROCEDURE NOJAF-UT-5

m. a m.,,

ULTRASONIC EXAMINATION FOR THE DETECTION OF

"[

(}

INTERGRANULAR STRESS CORROSION CRACKING nevisioN 10/23/81 V ~

REPLACES 858 6 % OF r

N/A REW PREPARED APPRgygg A&/ fu'S 0

5. 2 System Calibrati_on 5.2.1 Basic system calibration shall be performed using the appropriate reference standard, search units and instrumentation immediately prior to examination, or series of similar examination.

5.2.2 Examination system calibration verifications shall be performed at least at the beginning and at the completion of each 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 when any change is made in exam-ination personnel or system combination.

In addition, system calibration shall be checked and DAC curve verified ifter any interruption in power when using AC or after any change in power supply.

(e.g. from AC to battery or vice versa).

5.2.3 Calibration verification shall be checked at the primary ref-erence sensitivity level.

5.2.4 Signal response obtained during calibration verification shall be within plus or minus 20% of that established during basic

(

)

system calibration, v

5.2.5 If any point on the DAC curve has changed by more than 20%

of its amplitude, the examiner shall:

(1) Mark all weld data sheets since previous calibration void.

(2) Recalibrate examination system.

(3) Reexamine voided areas.

5.2.6 If cny point on the DAC curve has moved horizontally more than 5% of the sweep line from its original settings, the examiner rhall:

(1) Correct the sweep calibration and note it on the Calibration Data Sheet.

(2) Void any data sheets made since the previous calibration which have recorded indications and reexamine those areas.

5.3 If configuration or adjacent parts of the component are such that scanning from both sides of the weld is not practicable, it shall be recorded on the examination data sheet, b

Erases servicts i cr:no: Ta3 pa:e 6 er 15 QUALITY A$$URANCE ENGINEERING INSERVICE INSPECTION

,,,,,,, s.n PRocuouRe No.JAF-UT-5 ULTRASONIC EXAMINATION FOR THE DETECTION OF

- i oicates

/ '.

INTERGRANULAR STRESS CORROSION CRACKING REvisio'*

10/23/81

/

REPLACES ISS W E or i

N/A REW PREPARED APPROVED AJP' ss o

5.4 The reject control shall be set at the minimum position unless approved by the cognizant Level III provided the instrument linearity is within the requirements of Section 5.1 of this procedure. Approval by the Level III shall be documented by signing the Calibration Data Sheet.

6.0 EXAMINATION 6.1 Straight Beam Base Metal Examination for Laminar Reflectors 6.1.1 Using a reference standard such as one referenced in 4.3.2 set up sweep to accurately display the thickness range of the weld be inspected.

6.1.2 Place the search unit in a defect free area of the base material adjacent to the weld. Adjust instrument sensitivity to produce a minimum 50% to a maximum 75% of full screen reference back reflection and record actual thickness of base material.

p V

6.1.3 The area of the base material through which the sound will travel in angle beam examination, as shown in figure 2, shall be com-l pletely scanned with a straight beam search unit to detect re-i flectors which might affect interpretation of angle beam re-l sults.

(This is not intended as an acceptance-rejection examination).

l 6.1.4 Using applicable columns on Indication Data Sheet record all areas which produce a continuous indication equal to or greater than the remaining back reflection and which can not be contained within 1 square inch.

6,2 Straight Beam Examination of Weld and Heat Affected Zone NOTE:

To be performed only if angic beam examination per 6.3 can not be accomplished.

6.2.1 (A)

Material thickness (T) 1 inch and less (1) Position straight beam transducer on appropriate calibration standard to obtain maximum signal ampli-tude from the 1/2T hole.

l (2) Adjust the gain to produce a 50 percent full screen Leight response. Mark the sweep position and ampli-

,nU tude on the CRT screen.

7 cF 15 r:Aus st;vic;s swcompo:ATED Pf4 E QUALITY ASSURANCE ENGINEERING INSERVICE INSPECTION PR:CEDURE H2d AF-UT-5 ULTRASONIC EXAMINATION FOR THE DETECTION OF

['fwoicAtes n

INTERGRANULAR STRESS CORROSION CRACKING Revision 10/23/81 Q

RE Pt Aces issue or N/A REW PREPARED APPROVED

[ bI 0

(3) Draw a horizontal line across the display screen at the 50% FSH level.

This is the primary reference sensitivity.

Record this information on the Calibration Data Sheet.

6.2.1 (B) Material thickness (T) greater than 1 inch (1) Using the appropriate calibration standard, position the transducer for maximum response from the 1/4T hole.

(2) Adjust the gain to produce a 50 percent FSH response.

Mark the sweep position and amplitude on the CRT screen.

(3) Without changing the gain control, maximize the response f rom the 3/4T hole andjoin the two points with a straight line on the screen to cover the test range.

This is the primary reference sensitivity.

Record this informa-tion on the Calibration Data Sheet.

(~N 6.2.2 Examination coverage shall include the weld and IT on each side

(_)

of the weld.

6.3 Angle Beam Examination 6.3.1 One-half vee path examination techniques using the search units referenced in Table 2, shall be the preferred method and per-formed as follows:

(1) Select the appropriate search unit for the piping wall thickness and diameter from Table 2.

(2) Using a standard calibration block, such as one referenced in 4.3.2, set up the sweep display so that each major hori-zontal screen division on the CRT represents 1/4" of sound path.

(3) Using the appropriate piping standard, obtain maximized responses from the side drilled holes at 1/4T, 1/2T, 3/4T and 1 1/4T (if possible). Mark the positions on horizontal sweep of the CRT using a grease pencil or similar marker to establish a range reference.

7 Nv

M Paar 8 15 c':asca senvic:s ince:Po:AT;m or QUALITY ASSURANCE ENGINEERING INSERVICE INSPECTION PRICEDURE NO,JAF-UT-5

%E LEGENo oATE ULTRASONIC EXAMINATION FOR TiiE DETECTION OF R - suoicates 10/23/81 R E vist oN INTERGRANULAR STRESS CORROSION LRACKING m I-aEpuacts issus or f( _

N/A L

aEv enEpanto appaovEo Yl O

g (4) Without altering the range established above, maximize the signal response from the ID notch, and using the sensitivity controls, set the signal to 80% of full screen height (FSH). Mark its amplitude and position on the CRT as above.

This notch response is the primary reference sensitivity.

(5) Draw a horizontal line across the CRT from the 1/2T hole position to the notch position. This line shall delineate the area of interest and the primary reference sensitivity.

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

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

(7) Each weld shall be scanned as shown in figs. 1 & 2 using 45 angle beam, te,hniques applied in two directions par-(V) allel to the weld axis and in two directions perpendicular to the weld axis, where geometry permits.

6.3.2 If component geometry and/or accessibility prohibits the tech-nique referenced in 6.3.1, the following method shall be em-ployed:

(1) A nominal 3.5Milz, 1/4 diameter transducer, affixed to an appropriate wedge to yield a nominal 45 degree refracted shear wave shall be used.

(2) Maximize the signal responses from the first ID notch, the OD notch, and the second ID notch (if possible) to generate a one and on-half vee range.

(3) Using the sensitivity control, set the highest response of 80% of FSli and mark its position and amplitude on the CRT screen. Without changing the sensitivity, maximize the settings from the remaining notches and mark the amplitudes and positions on the CRT.

(4) Plot a DAC curve by connecting the locations marked on the CRT with a continuous line from the from surface to the second ID notch (when possible).

g-(5) This is the reference sensitivity level.

Record all in-C]/

strument settings on the Calibration Data Sheet.

cOASCO SIcVICES INCecPO%ATED PAGE9 01,15 QUALITY ASSURANCE ENGINEERING INSERVICE INSPECTION PaoCEDURE NO.JAF-UT-5 i n. aria.7s TeTLE LEGEND DATE (3

ULTRASONIC EXAMINATION FOR THE DETECTION OF a - iNoic ATEs k/

INTERGRANULAR, STRESS CORROSION CRACKING MEVisioN 10/23/61 REPLACES ISS U F or N/A REW PREPARED APPROVED b[

0 (6) Each weld shall be scanned such that the area of interest, as shown in figure 1, is covered (access permitting) as referenced in 6.3.1 (7).

NOTES: 1. If indication, other than geometry, are found in the area of interest it may be necessary to take additional thickness readings in that area to accurately plot the location. Straight beam may also be used to locate counterbore.

2. The search unit shall be swivelled (45 each way) as it is moved along a rectilinear scan pattern to ensure a minimum of 25% overlap of the transducer width.

This is required to detect cracks which may be oriented at odd angles.

7.0 RECORDING AND EVALUATION OF TEST RESULTS

(}

7.1 All indications which produce a response greater than 10% of the reference level shallbe investigated to the extent that the operator can determine the shape, identity and location of all such reflectors.

7.2 All non-geometric indications within the area of interest regardless of length or signal amplitude shall be unacceptable and recorded on the Indication Data Sheet (sample attached).

7. 3 Further evaluation of reportable indications to determine disposition and/or the need to make repairs shall be the responsibility of the Utility Owner who will evaluate in accordance with Section XI.

8. 0 REPORTS 8.1 A detailed ultrasonic examination report shall be prepared using the Indication Data Sheet and any additional sketches or photographs as may be applicable.

If no reportable indications are detected it shall be so noted on report form. All final Data Sheets shall be in ink.

8.2 Prompt (24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />) notification of recordable indications will be made to the representative designated by the Utility Owner.

O

r CC ASCO SL*2 VICES 1*4C7%POOATED PACE 10 or 15 c.

QUALITY AS$URANCE ENGINEERING INSERYlCE INSPECTION PROCEDURE NO.JAF-UT-5 I

LEGEND DATE dLTRASONIC EXAMINATION FOR THE DETECTION OF

= - iNoic ATEs

/ '

INTERGRANULAR STRESS CORROSION CRACKING R E VISION 10/23/81

'v') -

REPL Aces issue or N/A REW PREP RED APPROVED 0

OS IGSCC x

.08" Q,s NPS GREATER THAN 14" IGSCC

\\

/

\\

% 25" NPS 14" AND LESS Predominate locations of inter granular stress corrosien cracking in stainless steel piping as a function of pipe _ size.

^s FIGURE 1 (d

~

c Asco services inc:rcpon.T::o Paos 11 o' 15 QUALITY ASSURANCE ENGINEERING INSERVICE INSPECTION PROCEDURE NO.JAF-UT-5 c

W~

LEGEND DATE ULTRASONIC EXAMINATION FOR THE DETECTION OF n

ino, caves i

,,)

INTERGRANULAR STRESS CORROSION CRACKING REVistoN 10/23/81 REPLACES # SS U E OF N/A REW PR E P A Fe E D APPROVED

[

0 WCL D W/D YH

=

.g.

=

=

=

=

_ *t

• _l=

g-

.f -

=

=

=

(

--l

//

/

h v

-/,

/v u

r,1,a.u as-o a.,.

AJ</AL

('o *yyp1 l

l l

wru acawgro)

/

\\

l V

I

(.(>

Pipe "t"

Pipe t

nu NPS Schedule NPS Schedule 3"

10

.120" 8"

20

.250" 3"

80

.300" 10" 10

.165" 3"

160

.438" 10" 20

.250" 4"

10

.120" 12" 20

.250" 4"

80

.337" 12" 140 1.125" l

6" 10

.134" 1A" 10

.250" 6"

80

.432" 24" 10

.250" 6"

120

.562" 28" 1.350"

~

k )g 6"

160

.718" 28" 1.411

~

FIGURE 2

c asca servicas iNc neo=Teo race 12 er 15 QUALITY ASSURANCE ENGINEERING INSERVICE INSPECTION PRoCEDUR E NO. JAF-UT-5 LEGEND DaTE ULTRASONIC EXAMINATION FOR THE DETECTION OF n - tuoicates (j -

REPLACES 3 33 y E op INTERGRANULAR STRESS CORROSION CRACKING RcVislON 10/23/81 l

l N/A l

aEv

,aEpa=Eo

....o Eo i

[.

0

/

h

[

l TABLE 2

__ SEARCH UNIT __ SELECTION

(~x

'A Y NOMINAL STYLE PIPE SIZE WALL THICKNESS ELEMENT SIZE NIDIBER 4" - 12"

.25".875" 1/4" X 1/4" each 11 10" - 18"

.6" - 1.0" 3/8" X 3/8" each 10 10" - IS"

.8" - 1.8" 3/8" X 3/8" each 16 16" and Larger

.8" - 1.5" 3/8" X 3/8" each 16 NOTE:

The above search units are recorraended f ar angle beam examination per 6.3.1.

Others of similar design may be substituted.

7_.

i i

=)-

Prgo 13 of 15 4084/ M O EB ASCO SE RVICES INCORPOR ATED QU ALITY A55UR ANCE ENGlHEERING lHSERVICE lH5PECTION U

UT INSTRUMENT CAllBRATION I

82STRUMENT M ANUF ACTU RER PROJECT NO!EL SERI AL NO.

DATE l

AMPLITUDE LlHEARITY dB CONTROL ACTUAL SCREEN HEIGHT SCREEN HEIGHT

• CHANGE dB L ARGER INDIC ATION SM ALLER INDIC ATION Initial (OdB)

+ 2dB OdB 2dB 4dB

-6dB

[D 8dB

%J 10dB 12dB

• ilust be 50' of the Larger Amplitude, within 15'e of Full Screen Height AMPLITUDE CONTROL LlHEARITY l

INDIC ATION SET dB CONTROL IN DIC ATION LIMITS ACTUAL AT % FSH CH A IGE

% FSH

. FSH 80

- 6dB 32 to 48 80

-12dB 16 to 24 40

+ 6dB 64 to 96 20

+12dB 64 to 06 ACCEPTABLE ES NO E x AMIN E R(5) mplitude Lincavit)

TC-t A LEVEL A,plitude Control Linearity

{

TC.t A LEVEL

FM CoasCO senytCts encomponaTEo

~"

~ ~ '

' 'S j,..,

OU ALITY ASSU R ANCE ENGINEERING Page 14 of 15 INSERY1CE INSPECTION CALIBRATION DATA PROJECT DATA SH Ett MO.

gart peoCtcunt ist.uf.

any CQasPCNENT OR SYSTEM PIPE 00 IIF APPLIC ASLEl ITED IDENTIFICATION NCIS). LISTED ON REVERSE SIDE - COMPQNENT TEMP CALlanATION SLOCK NO.

THICKN ESC TEM P SCAN COVERAGE 0' WM A Z O' S ASE M ATERI AL AXI AL C CIRCUMFERENTI AL EQUlPMENT DATA SE ARCH UNIT INSTRUM ENT Manufacturer Manufacturer Medel Style Serial No.

Calite Longe Serial Re.

Fromency Reject Size Froouency Reo Rate Camoing Angle

• Mode as Gain - Cearse Fine PHeary Reference Rossense

(

"- ^ 'at Boten No.

Aeolitude % Ful! Screen Heigrit DAC PLOT - T1b 5 AM, PM CALIBRATION CHECX5 I

I too l

l l

l AMPL 2 20% (2d83 SWEEP S *. O F l

90 l

l cP INiT3 Ag AmPt swiTAg gecATies l

I I

I l

l UNE YES l

NO l

YES l

MO i

l I

l l

l l

l l

ro i

l I

I I

i i

l i

l l

l l

a l

l l

i i

l I

i l

l l

l l

s I

I I

I i

o l

i I

I o

?

i o

g i

l l

l l

l l

l l

l l

1 l

30 1

l I

i i

i 20 l

l I

I NOTE: Il reeoense ekove se m0* refer re Celibrarien Check

'l l

l l

l l

l l

l eecreen of proceekere.

10 I

I I

I 1

1 e

4 4

gx Again gpg gg 0

1 2

3 4

5 6

7 8

9 W

SWEEP T c. ALtvtL NO TE: non perterrnie, eman noriene sore no D AC is roooireer, g,

Tc.sa LtytL indiente refereste reflecter locarien and englitude ebeve.

arviteto ey caTE 10446 neuansts i

m

-,a

~

)

lIjI l

e! 4 f?

ftu3D t

sL oHe w

g7f e

sec l

e ec i t O

C og t

E r

i vW L

o C

Fe F r

t AL R e lg m

tE Et mO T

s SE EA L

L EF a

E t

C V

v R

A E

E e

o HM L

t T

s GC A

e

.A E

e A

l.

t E

F A

m,

E S

ss C

C r

M e

t col T

i A

E T0 e

s S

fuH o

t 0

E 0

t S AeF A

CL T

L sP%

A A

o e9 ms D

C eA

(

s e

, c e

f S

A e

T e

A N

D 9

.H E

v. T 8

8 L

st s

e e

A e

e o

s O

C u

P a

C es E

n FD a

e Pn LU se AT Ee HI Ec L

eAe RP

s. m OMA C s N

Ae

.os v

Ou

u. f ee e

s a

e

• l sl i

n s

0x o

n a

G 5A P

t E

u N

M s

n e

oI e

m i

e e

t eR w

o A

v a

N s

PN m

.E v E se E

e N O A Ec E

9 a

n m

E oI I

A cG T T N

esE T-OO H

nNC A oE E D C

P A

E 9

= E 5 N L

Ce(

e I

t L

R C N O U

, OC e s s

s As NI S

0 aoo H

A s

I emfnL T Fe A

T A

8 8

e R E T

AsF TA e

E O8 l

v A

T l

aU C o e e 8 t

C A

T O

t s

A

C 1 l N

t 1 Y I

L AR D u

s l

A L

LAn E

3 E H D H so es E

C Y 5 l

T e

t C

s T C N eeeL H

Rs s

s gA aI eCoE CF oLl i o t

o cA iP s E e C ep s

e FN As U

S teeE Tg e C

O 7

ss A

Ss eAC 8

e a x uTCE oc E Cs F

es

1. o e

E P

8 a

R Cg 1

t G

Ps nA s

Ee E D Mse A

yA W

P L SW EP o

F

, C e

l A

,, D H

~_

T G

a N

JE 0

D0 D E

N L

O A4 L S

.(

g l

u t

O A

D L

=

M LF F

A E

EO O4 l

v 0

u W

0 A

N9 O

OT I A T C

.N I

DA O O AI D

NCt N C D E

C 4

I Y

ON Q

I L

e A

C T

T A

N O

O A

I I

=TS

.N C N 0

A RseE I O O t

l i

C I uRaa Dl H C

CCE g N f A

3 sE R

I U

F e

g I

i D

s T

.e 7A II 8E haB=

G S

C l

llllll1

9 q

,e ATTACHMENT NO. 4

.. -