ML20070E072

Forwards Ms Mostafa 940624 Memo Re Failure Analysis Rept 94-005,independent Lab Analysis of Fastners from SONGS Warehouse & Procedure S0123-XXXII-2.5,Rev 1,PCN 1-2, Sampling Program For...Commercial Grade Item Quality

ML20070E072
Person / Time
Site:	San Onofre
Issue date:	07/12/1994
From:	Marsh W SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20070E075	List: ML20070E072
References
NUDOCS 9407140052
Download: ML20070E072 (23)

Text

. . _ . . . ._. _ _ _

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,f%A7 Southem Califomia Edison Company 23 PARKER STREET IRVINE, CALIFORNIA 9271ft WAU ER C MAHSH July 12, 1994 , , . _

MANAGE N OF NLICt FAR NFGUL ATOF4V AFF AWIG C/14) 4S4-4403 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Gentlemen:

Subject:

Docket Nos. 50-361 and 50-362 Fastener Information San Onofre Nuclear Generating Station Units 2 and 3 Enclosed at the request of Mr. Mel Fields,- NRC Project Manager for San Onofre Units 2 and 3, are the following SCE documents.

1. Memorandum from Mostafa S. Mostafa and W. W. Strom to M. B. Ramsey,

Subject:

Failure Analysis Report 94-005, Independent Lab Analysis of Fasteners from SONGS Warehouse, June 24, 1994.

2. Procedure S0123-XXXII-2.5, Rev. 1, PCN 1-2, Sampling Program for ,

Assessing, Estimating, and Reporting Commercial Grade Item Quality, March 21, 1994.

If you have any questions on these documents, please let us know.

Sincerely, 1

cc: L. J. Callan, Regional Administrator, NRC Region IV K. E. Perkins, Jr., Director, Walnut Creek Field Office, NRC Region IV J. A. Sloan, NRC Senior Resident Inspector, San Onofre Units 2 & 3 M. B. Fields, NRC Project Manager, San Onofre Units 2 and 3

,r.. nan LuuvuJ 9407140052 940712 aa/

PDR ADOCK 05000361 'f

.P- PDR j

I June 24,1994 M.B. Ramsey

SUBJECT:

Failure Analysis Report 94-005 Independent Lab Analysis of Fasteners from SONGS Warehouse BACKGROUND Independent dimensional analysis of allthread stud material was requested by Mr. Mike Ramsey of ISEG/ Root Cause. The results were to be compared to dimensional inspections which had been performed by SONGS QC staff on the same components using Johnson Gages.

Also, mechanical testing of a selected sample was requested to verify the mechanical properties including thread shear strength.

PROCEDURE Five allthread studs 5/8" in diameter,11 threads per inch, 36 inches in length, SA 193-B7 material, with class 2A thread fit were identified as samples #5,11,16,23, and 31 from TLIS Test Package No 32KRT.PRN MTF-0166-94. The dimensional analysis was performed by B&B Metrology Company of Lake Elsinore, California. The three wire method and super micrometer were used to measure the pitch diameter, the major diameter and the minor diameter. The measurements were made in an environmentally controlled chamber at 68o F and 45% humidity.

The mechanical testing was performed on cut coupons from stud #16. The testing consisted of tension testing and proof load testing. Three tensile coupons were machined and tested.at room temperature. The yield strength, ultimate tensile l strength, elongation percent, and reduction of area were recorded. An additional pull test was performed on a full size threaded section and the tensile strength was measured. i The proof load test was performed per ASTM A-370 and F-606 Method 1, " Length Measurement" on three samples. Two samples were conventionally proof loaded to )

87% of the minimum 2% off-set yield (105 ksi) as specified by ASTM A 193 for GR.B7 bolts. The other sample was proof loaded to a much higher valve (140 ksi) equivalent to the actual measured yield strength. This last test is not commonly performed for l 1

proof load testing, however it was carried out to determine the permanent plastic deformation (stretching) under these conditions.

l l

FAR 94-005 JUNE 24,1994 l

The thread shear strength was verified on cut segments of stud #5, where the number '

of engaged threads on each side was varied. The number of engaged threads used l was 9, 7, 6, 5, 4, and 3.  ;

1 All the mechanical testing was performed at Atlas Testing Laboratories of Commerce, l California. l l

RESULTS l Dimensional Analysis The pitch diameters of the 5 allthread studs as measured by OC staff using Johnson Gages are listed in Table 1. The oimensions were tested by the three wire method in which three areas of the stud (ends and mid section) were measured, and the results are listed in Tables 2,3,4,5 and 6 representing studs #5,11,16,23, and 31, respectively. The OC Inspector who performed the Johnson Gage measurements had been contacted and it was determined the allthread ends and midsection were the tested areas. The " limits of size for standard series threads" per ASME B1.1 are listed in Table 7.

The three wires method is considered, if used properly, the most accurate and the most generally satisfactory method according to precision measuring tools hand book, Van Keuren*. Comparing the measured pitch diameter using the three wires method and the Johnson Gages as illustrated in Table 8 one finds the following:

1. Both methods appear to provide readings in the 0.0001" range, and provide a high degree of accuracy.

2. The maximum deviation from B1.1 standard limits is more consistent in the case of the three wires method than in the Johnson Gage method with the exception of stud #16.

3. Both methods identified the same studs as dimensionally out-of-tolerance

4. The identified out of tolerance range by both techniques was 1.1 to 2.0 mils (0.0011"- 0.002"). This out-of-tolerance condition, as demonstrated by the mechanical testing included in this report, is considered to have a negligible effect on the performance of the fastener.

5. No correlation could be made between out-of-tolerance pitch diameter readings and thread minor diameter readings.

• Precision Meas 7ing Tools Handbook No. 37, The Van Keuren Co.

FAR 94-005 -o- JUNE 24,1994 Tension Testina The results of the tension tests performed on sample #16 are listed in Table 9. The mechanical properties met the specified minimum values per ASTM A 193 Grade 87 fasteners. The pull test performed on the actual stud section also met the ASTM A193 minimum requirement; that is to say, despite the out-of-tolerance pitch diameter dimensions detected on these the studs, the minimum mechanical requirements were met.

Proof Load Testina The results of the proof load test, where the threaded section of stud #13 was exposed to 87% of 105 ksi (The specified minimum yield strength by ASTM S193 -

GR.87) are listed in Tables 2 and 3. Both samples passed the proof load testing with stretching within the maximum allowed values. This test demonstrates, that even the stud was dimensionally out of tolerance, it still passed the proof load test. In other words, it met its mechanical requirements when torqued up to 87% of the specified minimum yield strength.

An unconventional proof load test, where the sample was exposed to 87% of the actual measured yield (140 ksi) was performed. The measured elongation indicated a permanent stretch of 0.00053", the maximum allowable stretch is 0.0005". That is to say, it was marginally out of range by only 0.00003" over 2" long gage length. See Table 12.

Minimum Number of thread Encaaement In order to demonstrate the thread shear strength of the known undersized thread profile, a series of pull tests were performed with a varying number of engaged threads. The results of the pull test on 9, 7, 6, and 5 threads did not exhibit any thread stripping and the fracture was a ductile fracture across the minor diameter cross section, occurring in the mid section of the sample. See Figures 1,2,3, and 4 representing the 9,7,6, and 5 thread engaged tests, respectively.

The four threads engaged case resulted in thread stripping as shown in Figures 5 and

6. The three threads engaged test resulted in stripping as shown in Figures 7 and 8.

l In summary, the minimum number of engaged threads required to provide a good clamping joint without thread failure is five (5) threads. The actual number of engaged threads used on this type of studs is seven (6.9). This is provided by a nut

of a length equal to one diameter (5/8"). This nut, as proven in this test, will provide I an adequate thread engagement.

l

l I

I FAR 94-005 JUNE 24,1994 l Summary and Conclusions The results of the independent dimensional analysis performed on the studs was in agreement with the results previously detected by Johnson Gages. j The submitted worst case out of tolerance stud (out of tolerance by 0.002" on the pitch diameter) was mechanically proof load tested. The tested samples passed the proof load tests and met the minimum mechanical requirements specified by ASTM A-370 and F-606, Method 1.

The minimum number of engaged threads required to avoid stud thread stripping .

under ultimate load was determined to be 5 threads. The number of threads in a standard heavy hex nut is seven (6.9). This will provide adequate thread engagement and will prevent thread stripping under proper torquing application.

OS 8.bS Mostafa S. Mbstafa ' '

Sr. Root Cause Engineer k/?W f-W.'1h. Strom Supervisor Independent Safety Engineering / Root Cause Group MSMostafa:elg ,

cc: C. Chiu K. Slagle W. Frick T. Herring ill D. Opitz S. Brown  ;

J. Rainsberry l

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FIGURES i

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Figure 1. 9 Threads engage;! .

l Figure 2. 7 Threads engaged

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i Figure 6. Close ups view of stripped Threads 4 Threads engaged d

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Figure 7. 3 Threads engaged g nn gy n .-

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Figure 8. close up view of stripped Threads (3 Threads engaged).

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l TABLES i

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J-o cu o ') H f.. Y MW- o n %> 'AM a

ut, .2. tL. gl.T . [# (? d W-IR-0 U S - 91 R1 Page 1 of 1 2/09/94 09:59 PRINT.OUT OF KURT CHECK SPC DATA Part Code: Q1011363 Chart No. 2 Partname Rod,All Thread Part No. Q1011363 Machine No. t. 2 Seq. No. 1 Customer:

Description:

5/8 . 11 x 36 UNC 2A Xbar & R Subgroup Size: 18 Chatt Type:

Pa rame t e r : (f D S i z e) 0.5G44 0.5589 Data Code: 1 = 1", 0 = 0" Spec. Tol.

Printout Detween Dates START: 02/09/94 09:30 END: 02/09/94 09:56 MEAN RANGE SAMPLES.,

IGil IDENTIFIERS .. (c. .

1 Date: 02/09/94 0.5586 0. 004 8 #f(f.~5 5T@ (d'TST9 4 (0. 5 580 M 09:38 *7 0.5595 0.5595 0.5599 N Time:

Oper: FRL ** tl @ . 5 5 7 9 M d . 5 5 7 fD 4 0.5599 V a <.:t 0 . 5 5 9 2 0.5602 Ecode: 0 g o g q1 0.5592 M Status: OUT OF CpNTROL m o 0.5593 0.5595 M& TEN: PE- 0164 / an,C.5554) 6557Q d.557Q N M& TEN: PE-0256 p M&TE#: PE- 024 5 /

Note: P.D. SUBGROUPN 1: M3 EA. READINGS OBTAINED FOR EACH STUD. REF. MTF.0166 94, TLIS T/PN 32KRT.PRN, M/CN 305-05606.

FRED R. LONG ft16 2/9/94.

2 Date: 02/09/94 0.5607 0. 0 0 4 3 *4(D . S 5 ti@ (D_.SS89 g 6 L_58# 5 ^/

Time: 09:50 == '8 0 . 5 619 0.5622 0.5625 c m 3) 0.5616 0.5613 0.5615 c Oper: FRL 0.5614 C.

CCode: 0 w.co% 'ty -SI 0.5612 0.5616 Status: IN CONTROL d sJ" 0.5609 0.5606 0.5604 N M& TEN: PE.0164 a.r? 0.5598 0.5601 0.5597 V M& TEN: PE.0256 M& TEN: PE-0245 Note: P.D. SUBCROUPN 2. a t.a . READINGS OBTAINED FROM EACH STUD.

REF.bfrF 0166- 94, TLIS T/PH 32KRT.PRN, M/CN 305 05606. FRED R.

LONG N16 2/9/94.

0. 5600 nse: 0.5600 0.5599 0.5599 N 3 Date: 02/09/94 0.0933 0.0000 0.0000 0.0000 Time: 09:56 FRL 0.0000 0.0000 0.0000 Oper: 0.0000 ECode: 0 0.0000 0.0000 OUT OF CONTROL 0.0000 0.0000 0.0000 Status 0.0000 M& TEN: PE.0164 0.0000 0.0000 M& TEN: PE 0256 M& TEN: P8-0245, Note: P.D. SUBGROUPN 3: 1 STUD ONLY COVERED UNDER THIS SUDGROUP.

3 READIN G:, {S OBTAINED jAT FOR STUD. REF. MTF.0166 94, TLIS T/PN 32KRT.PRN, M/CN 305-05606. FRED R. LONG #16 2/9/94.

% Y-e^  % 4gh, ,_3.w D,;dh

~- ".W_n"/V-~/v

c. = e .a TABLE 1

T 2.

CERTIFICATE OF CALIBRATION by B & B METROLOGY 17504 Crand Avenue, Lake Elsinore,Ca.92530 (909) 678-5546 (800) 523-2835 Traceable to NIST and CONFORMS to MIL-STD-45662A Customer:SO. CALIF. EDISON I Test Numbers 0425-7 5000 PACIPIC COAST MtTs. Test Date: APRIL 25, 1994 SAN CLEMENTE, CA. 92674 Next Cal N/A Model No.35/8-11 NIST NUMBEh4N/A Serial No.:NONE Condition Received:

Asset No.: 5 Within Tolerance Manufacturer:NONE Inoperative

Description:

Out of Tolerance ALL THREAD TYPE STUD Metrologist:BB4 Temp.: 68.F Humidity: 45%

Calibration Standards Used afg. model asset no. cal'd due MTI 162-102 BB075 OCT. 19, 1993 OCT. 19, 1994 VKC 34HS BB079 FEB. 4, 1993 FEB.-4, 1995 MTI 519-302 BB116 OCT. 19, 1993 OCT. 19, 1994 MRV S14B BB200 OCT. 25, 1993 OCT. 25, 1994 Procedure Used: CP-29 Uncertainty of Measurement: 20 PPM Condition Returned Within Out of Other Tolerance Tolerance See Remarks Accuracy : N/A Remarks: MAJOR DIA. PITCH DIA. MINOR DIA.

1. .6200 .5578 .5027

2. .6204 .5582 .5015

3. .6206 .5583 .5026 POSITION #1 IS THE END THAT IS NUMBERED, #2 IS THE CENTER, AND

1. 3 THE OTHER END.

LABORATORY SUPERVISOR : _ ,

B9-14/232 TABLE 2

~U 3 CERTIFICATE OF CALIBRATION by B & B METROLOGY 17504 Grand Avenue, Lake Elsinore,Ca.92530 i (909) 678-5546 (800) 523-2835 '

Traceable to NIST and CONFORMS to MIL-STD-45662A Customer:SO. CALIF. EDISON Test Number:0425-4

-e.

5000 PACIFIC COAST HWY. Test Date: APRIL 25, 1994 SAN CLEMENTE, CA. 92674 Next Cal: N/A Model No.15/8-11 NIST NUMBER:N/A Serial No.:NONE Condition Received:

Asset No.: 11 Within Tolerance Manufacturer:NONE Inoperative

Description:

Out of Tolerance ALL THREAD TYPE STUD Metrologist:BB4 Temp.: 68 J Humidity: 45%

Calibration Standards Used afg. model asset no. cal'd due MTI 162-102 B8075 OCT. 19, 1993 OCT. 19, 1994 VKC 34HS BB079 FEB. 4, 1993 FEB. 4, 1995 ,

MTI 519-302 BB116 OCT. 19, 1993 OCT. 19, 1994 MRV S14B BB200 OCT. 25, 1993 OCT. 25, 1994 Procedure Used: CP-29 Uncertainty of Measurement: 20 PPM ,

1 Condition Returned: Within Out of Other Tolerance Tolerance See Remarks Accuracy. N/A  ;

Remarks: MAJOR DIA. PITCH DIA. MINOR DIA.

1. .6200 .5579 .5031

2. .6200 .5580 .5025

3. .6200 .5578 .5023 POSITION #1 IS THE END THAT IS NUMBERED, #2 IS THE CENTER, AND

1. 3 THE OTHER END.

LABORATORY SUPERVISOR : h{ 1, .

BB-14/232 I TABLE 3

4 CERTIFICATE OF CALIBRATION by B & B METROLOGY 17504 Crand Avenue, Lake Elsinore,Ca.92530 (909) 678-5546 (800) 523-2835 Traceable to NIST and CONFORMS to MIL-STD-45662A Customer:SO. CALIF. EDISON Test-Number:0425-6 5000 PACIFIC COAST HWY. Test Date: APRIL 25, 1994 SAN CLEMENTE, CA. 92674 Next Cal: N/A Model No.:5/8-11 NIST NUMBER:N/A Serial No.:NONE Condition Received:

Asset No.: 16 Within Tolerance Manufacturer:NONE Inoperative

Description:

Out of Tolerance ALL "9EAD TYPE STUD Metrologist:BB4 Temp.: 68 .F Humidity: 45%

Calibration Standards Used afg. model asset no. cal'd due MTI 162-102 BB075 OCT. 19, 1993 OCT. 19, 1994 VKC 34HS BB079 FEB. 4, 1993 FEB. 4, 1995 ,

MTI 519-302 BB116 OCT. 19,'1993 OCT. 19, 1994 MRV S14B BB200 OCT. 25, 1993 OCT. 25, 1994 Procedure Used: CP-29 Uncertainty of Measurement: 20 PPM i

Condition Returned: Within Out of Other Tolerance Tolerance See Remarks Accuracy : N/A.

Remarks: MAJOR DIA. PITCH DIA. MINOR DIA.

1. .6203 .5582 .5045

2. .6200 .5580 .5032

3. .6190 .5569 _ .5033 'l POSITION #1 IS THE END THAT IS NUMBERED, #2 IS THE CENTER, AND 1

1. 3 THE OTHER END.

I LABORATORY SUPERVISOR :

Q _ _

BB-14/232 TABLE 4  ;

l i

I

, ,dA s CERTIFICATE OF CALIBRATION by B & B METROLOGY 17504 Crand Avenue, Lake Elsinore,Ca.92530 (909) 678-5546 (800) 523-2835 Traceable to NIST and CONFORMS to MIL-STD-45662A

. Customer:SO. CALIF. EDISON Test Number:0425-5 5000 PACIFIC COAST HWY. Test Date: APRIL 25, 1994 SAN CLEMENTE, CA. 92674 Next Cal: N/A Model No.:5/8-11 NIST NUMBER N/A Serial No.:NONE Condition Received:

Asset No.: 23 Within Tolerance Manufacturer:NONE Inoperative I

Description:

Out of Tolerance ALL THREAD TYPE STUD Metrologist:BB4 Temp.: 68,F Humidity: 45%

Calibration Standards Used .

mfg. model asset no. cal'd due '

MTI 162-102 BB075 OCT. 19, 1993 OCT. 19, 1994 VKC 34HS BB079 FEB. 4, 1993 FEB. 4, 1995 MTI 519-302 BB116 OCT. 19, 1993 OCT. 19, 1994 MRV S14B 60200 OCT. 25, 1993 OCT. 25, 1994 Procedure Used: CP-29 Uncertainty of Measurement: 20 PPM Condition Returned: Within Out of Other Tolerance Tolerance See Remarks Accuracy : N/A i

Remarks: MAJOR DIA. PITCH DIA. MINOR DIA.

1. .6200 .5578 .5030

2. .6200 .5579 .5030

3. .6201 .5578 .5023 j POSITION #1 IS THE END THAT IS NUMBERED, #2 IS THE CENTER, AND.

1. 3 THE OTHER END.

]Q LABORATORY SUPERVISOR :

l BB-14/232 TABLE 5 i

'l l

T LN L

CERTIFICATE OF CALIBRATION by B & B METROLOGY 17504 Grand Avenue, Lake Elsinore,Ca.92530 (909) 678-5546 (800) 523-2835 Traceable to NIST and CONFORMS to MIL-STD-45662A Customer:SO. CALIF. EDISON Test Number 0425-1 5000 PACIFIC COAST HWY. Test Date: APRIL 25, 1994  ;

SAN CLEMENTE, CA. 92674 Next Cal: N/A Model No.:5/8-11 NIST NUMBER:N/A Serial No.:NONE Condition Received:

Asset No.: 31 Within Tolerance Manufacturer:NONE Inoperative

Description:

Out of Tolerance I ALL THREAD TYPE STUD e

Metrologist:BB4 Temp. t . 68 JP Humidity: 45%

Calibration Standards Used mfg. model asset no. cal'd due MTI 162-102 BB075 OCT. 19, 1993 OCT.,19, 1994 VKC 34HS BB079 FEB. 4, 1993 FEB.'4, 1995

• MTI 519-302 BB116 OCT.~19, 1993 ( CT. 19, 1994 MRV S14B BB200 OCT. 25, 1993 OCT. 25, 1994 Procedure Used: CP-29 Uncertainty of Measurasent: 20 PPM Condition Returned: Within out of Other Tolerance Tolerance See Remarks Accuracy N/A ,

Remarks: MAJOR DIA. PITCH DIA. MINOR DIA. .

1. .6194 .5609 .5040

2. .6197 .5614 .5056

3. .6195 .5612 .5056 POSITION #1 IS THE END THAT IS NUMBERED, #2 IS THE CENTI:R, AND

1. 3 THE OTHER END.

LABORATORY SUPERVISO7 : Q Q.. _ i BB-14/232 F

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2 V W  %* 1% b  %  %  % '% 4 4 u  %

s n

k

. a.s _

TABLE 3 PITCH DIAMETER DIMENSIONS P!tch Diameter Pitch Diameter Max. Deviation Johnson Gage Three Wires Method from B1.1 Three Johnson Wires

1. D. # Reading 1 Reading 2 Reading 3 Reading 1 Reading 2 Reading 3 Gages Method 5 0 5580' O.5587 0.5588 0.5578' O.5582 0.5583 -0.0009" -00011" 11 0.5577 05574' O5578 05579 0.5580 0 5578' -00015" -0 0011" 16 05554' O.5576 05576 05582 0.5580 0.5569' -0.0035" -0.0020" 23 0.5582* O.5584 0.5588 0.5578' O 5579 0.5578 -0 0007" -0 0011" 31 0.5616 0.5613 0.5615 0.5609 0.5614 0.5614 - -

• IdentAes the maximum out of tolerance rnessured.

B1.1 Pitch dameter brruts: 0.5589 (un),0.5644 (MAX)

TABLE 8

G ATL AS TESTIN G L A B O R AT O RI E S, I N C.

N(f ' .D A smesAAr OF A444rsrs. sec. 6929 E SLAUSON AVE e COMMERCE,CA 90040 e (2 t 3) 722-8810

< CHEMISTS - METALLURGISTS - ENGINEE RSg Page 1 of 5 or IN ACCOUNT WITH T A q. SOUTHERN CALIFORNIA EDISON 5000 PACIFIC COAST WY. SAN CLEMENTE, CA 92672 DATE 5/4/94 CUSTOMER ORDER NO. CUSTOMER $ HIPPER NO. LABORATORY NO. 405813 iOENigrito Stud-5/8"-!! UNC-2A PART NO. Submitted As: uATEniAL AISI 4140 Steel spEcificAfiON ASME SA193 ASTM A193 HE AT TREAfiNO CO. WifNESSED 8V Or. 57 asscei-M reef Raposit visto seas =ot= re =s.te stas = ores scru.g actus ACTun actuu ", [

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TENSILE 1 EST (PAchined Cpns.) 1 .250 .0491 6,900 140,500 7,500 152.700 .21 21.0 .158 60.0 2 .255 .0510 7,200 141,200 7.800 152,900 .19 19.0 .160 60.0 3 .254 .0506 7,050 139.500 7,680 .22 151.800 22.0 .160 60.0 AXIAL TI NSILE (Full S1:e) , Location of Practur o

          #1                          .226 *31,000 137,200 '*b4,100 150,900                                 Middla of Exp) sed Se : tion Test Mi thod: ASTM-F6C6 & ASTH               E8 (a) Max: mum Ic ad to fi acture

• Appi oximal e yieldi ng load MAxlWUM REOUIREMENTS MINIMUW REOuiREMENTS 105.000 125.000 16.0% 50.0%

viELo STRENGTH AT ' ,gg.Offeet REMARKS: Conforms to requirements. c .s. . O set ca. ..=. n.. O ici - 6.... ... s O se " 6..i . .' e . . s 14 SuasCRIBED ANO $ WORN TO BEFORE ME THIS g

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T A 5081/OHAr Of Awv173. PC. 6929 E SLAUSON AVE. e COMMERCE,CA 90040 e (213)722 8810 CHEMISTS - METALLURGISTS - ENGINEERS Page 3 of 5 ar IN ACCOUNT WITH SOUTHERN CALIFORNIA EDISON 5000 PACIFIC COAST HWY. SAN CLEMENTE. CA 92672 DATl 5/4/94 cusf oss e onces wo, cusfomen seappen no. L AsoS Af oN V No. 405813 to(NTIPit0 Stud-5/8"all tTNC-2A paaf wo, uAf g el AL AISI 4140 Steel SP E CIF 4C AfloM SAMPLE #2: Proof loaded to 20.650 pounds (based on 87% of the minimus 2% offset yield of the material which is 105 ksi) Results Permanent deformation is 0.0004-inch maximum allowable 0.0005-inch (pass) Test Method: ASTM-F606 para. 3.2.3 Method 1. length measurement. REMARKS: For information only. I SUBSCRl6fD AND SWORN TO BEFORE ME THIS NOTARY PUBLIC in a=o som vae covarv or Los anosses. stats or cAuronwiA a.

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il I' } AT L A S T ES TIN G L A B O R ATO RIES, IN C. ( _4% A 508%DMY Of AwMff WC S 6929 E SLAUSON AVE e COMMERCE.CA 90040 e G131722 8810 CHEMISTS - METALLURGISTS - ENGINEERS

                      ,,                                                                Page 4 of 5 IN ACCOUNT WITH e

SOUTHERN CALIFORNIA EDISON 5000 PACIFIC COAST HVY. T ll SAN CLEMENTE CA 92672 oars 3/4/9' custoute onora no. custoute swippea no. L A$on AfoeV No. 405813 ,o g u y,,is o stud-5/8"-11 UNC-2A ,Aar m Submitted Ast un t r a'*L A!SI 4140 Steel # f C"'C ^i'0M SAMPLE #3s Proof loaded to 20.650 pounds (based on 87% of the minimum 2% offset yield of the material which is 105 kei) Results Permanent deformation is 0.00045-inchi maximum allowable 0.0005-inch i (pass) Test Method ASTM-F606 para. 3.2.3 Method 1. length measurement. REMARKS For information only. I l l I Suo5CRisto AND SWORN TO BEFORE Mt THis RESPECTFULLY SUBMITTEG-DAY OF te

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I f ( __ ATL A S TESTIN G L A BOR ATORIES, INC. A svesoAarOrmf5ft m< ' 6929 E SLAT > SON AVE e COMME ACE,CA 90040 e (213) 722 8810 k> CHEMISTS - METALLURGISTS - ENGINEERS Page 2 of 5 ar IN ACCOUNT WITH T;JL k vt. SOUTitFRN CALIFORNIA EDISON 5000 PACIFIC COAST HWY. SAN CLEMENTE CA 92672 oAta 5/4/94 custouteoseanuo, customan sappen No, Lasonatoef wo. 405813 sogari,isoStud-5/8"-11 UNC-2A past me, ! Submitted Ast m itatal ASTM-A 193 AISI 4140 STEEL $Pf CIFICAf ton ASME-A193 Cr. 87 SAMPLE #1: Proof loaded to 27.530 pounds (based on 87% of the actual 2% offset yield of the material which is 140 kai) with 10-seconds hold-at-load. Result: Permanent deformation is 0.0053-inch / maximum allowable 0.0005 inch /(fail) Proof loaded 9 20,650 pounds (based on 87% of the minimum 2% offset yield of the material which is 105 kai) Results Permanent deformation is 0.0009-inch / maximum allowable 0.0005-inch / (fall) Test Methodt ASTM-F606 Para.3.2.3 Method 1, length measurement REMARKS For information only. (19 cop d 60h o A At. Tr 61~ To# t

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