ML20113D327

Rev 0 to Outline for Sampling,Preparation & Testing of Spot-Welded Superstrut Members for Diablo Canyon Power Plant

ML20113D327
Person / Time
Site:	Diablo Canyon
Issue date:	05/21/1983
From:	PACIFIC GAS & ELECTRIC CO.
To:
Shared Package
ML20105B784	List: ML20113D238 ML20113D319 ML20113D327
References
FOIA-84-21 PROC-830531, NUDOCS 8501230063
Download: ML20113D327 (9)

Text

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i ATTACHMENT 1 I

Outline For Sampling, Preparation And Testing Of Spot-Welded Superstrut Members For Diablo Canyon Power Plant t

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_R &M Rev. O Date May 1983 ~

i 0072C/0109P-1 l

TABLE OF CONTENTS 1.0 General i

2.0 Sampling and Testing 2.1 Sample Selection 2.2 Specimen Preparation 2.3 Specimen Testing I

3.0 Report j

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l 4.0 Figures and Attachments I

5.0 Quality Program

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I 0072C/0109P-2

1.0 GENERAL The following outline shall be used for the sampling, test preparation, and testing of spot welds for Superstrut members obtained from the Diablo Canyon Power Plant. All work is to be performed under the direct supervision and control of Project Engineering, and observed by a Project Engineering Representative. Deviations from the provisions set forth in this outline may be made on a case-by-case basis only when documented and approved by the Project Engineering Representative.

2.0 SAMPLING AND TESTING 2.1 Sample Selection 2.1.1 Specimens to be tested are back-to-back, spot welded Superstrut members, types A1202, E1202, and H1202 (See Figure 1).

2.1.2 270 Superstrut members (150-A1202, 90-E1202 and 30-H1202) shall be randomly selected for testing from existing Seismic Category I cable tray and conduit supports located in Units 1 and 2 of the Plant.

Random selection will be accomplished by numbering each raceway support (e.g., #1 to #22,000).

Rando.1 numbers shall then be selected which will identify the supports from which test members will be taken.

2.1.3 The field shall remove members as instructed by Project Engineering.

Each member shall be tagged with its appropriate sample nuder.

The support number from which each member was taken shall also be recorded (see Sample Log Sheet - ).

2.1.4 After all specimens have been labeled, they shall be packaged and sent to: Bechtel M&QS Testing Lab, 301 Mission St., San l

Francisco, CA.

2.2 Specimen Preparation 7.2.1 Upon receipt, the test lab shall cut the Superstrut members into test specimens in accordance with Figure 2, and in accordance with AWS C1.1-66; Section 503 (see Attachment 1).

2.2.2 Test specimens shall be secured in drilling and cutting apparatus in such a manner that no loads are induced in test weld as the specimen is being cut to its proper configuration.

2.2.3 If any of the test specimen spot welds fail during preparation of the specimen, the specimen number shall be recorded with the notation " WELD FAILED WHILE CUTTING SPECIMEN". A tabulation of the failed specimens,-if any, shall be included in the report to Project Engineering.

Additional specimens shall then be cut from the same member and tested as described in Section 2.3.3.

2.2.4 As specimens are being cut from the selected members, each test specimen shall be indelibly labeled with the sample number as outlined in Section 2.1.3.

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2.2.5 Each specimen shall be visually inspected by Project

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Engineering Representative after test preparation is complete.

and prior to testing.

2.2.6 All residual material shall be retained, until released by Project Engineering.

2.3 Specimen Testing L

2.3.1 Testing shall be performed on all specimens by applying a tensile load to the test specimen, therets inducing shear in a single spot weld (see Figure 2). Testing shall be performed in accordance with AWS C1.1-66, Section 504 (see Attachment 1). The requirement stating that "the record of the specimen should also include a complete description of the properties of the metal such as thickness, tensile strength, ductility and chemical composition" may be deleted.

2.3.2 Load shall be applied at a slow unifom rate until the ultimate (failure) load is obtained.

2.3.3 If, during testing, any of the specimens shown an ultimate strength of 1600 pounds or less, the following steps shall be taken: A) The remaining member, if any, from which the specimen was cut, shall be made into additional specimens and tested; B)

These additional specimens shall be clearly identified in the report as additional tests and shall identify the members from which they were taken.

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3.0 TEST REPORT 3.1 Test results shall be submitted to Project Engineering at the conclusion of testing. Results shall include:

a)

Ultimate strength of each specimen spot weld, b)

Manner of fc11ure, c)

Signature of Project Engineering Representative, d)

Signature of Lab Technician.

Data shall be recor(ed on fom provided in Attachment 3.

3.2 The test report shall also include:

a)

A sketsh of the apparatus set-up used in the test, b)

A list of specimens that failed during preparation (if any),

c)

A list of the test lab's machinery used in the testing along i

with calibration data and dates, when appropriate.

4.0 FIGURES AND ATTACIMENTS Figure 1: Back-to-Back, Spot Welded Superstrut Members 1

Figure 2: Test Specimen Configuration

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' : AWS C1.1-66 " Recommended Practices for Resistance Welding"

, : Superstrut Sample Log Sheet : Sumary of Test Results

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5.0 QUALITY PROGRAM Work covered herein shall be performed in accordance with the Ouality Program and additional related procedures, which currently apply to design engineering work on the Diablo Canyon Project.

0072C/0109P-5

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SUMMARY

OF TEST RESULTS Sionature Shear Load Manner of Lab.

P. E.

Specimen Number 9 Failure (1bs)

Failure

• Remarks Tech.

Rep.

Tests Performed At Date t

• Manner of Failure A.

Shear of Spot Weld

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B.

Weld Failure During Preparation C.

Other (describe)

Signed:

(Project Engr. Rep.)

(Lab Tech.)

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l 0072C/0109P-6