ML20154E240

Informs of Apparent Deficiency Re Horizontal Liner Plate Seam Welds W/Finished Surface Not in Accordance W/ Requirements of Paragraph UW-51,per Insp on 700623-26. Comments Requested within 30 Days

ML20154E240
Person / Time
Site:	Diablo Canyon, 05000000
Issue date:	07/21/1970
From:	Rich Smith US ATOMIC ENERGY COMMISSION (AEC)
To:	Peterson R PACIFIC GAS & ELECTRIC CO.
Shared Package
ML20154C370	List: ML20154C367 ML20154D294 ML20154D425 ML20154D452 ML20154D528 ML20154D575 ML20154D594 ML20154D647 ML20154D736 ML20154D846 ML20154D855 ML20154D869 ML20154E066 ML20154E143 ML20154E188 ML20154E240 ML20154E258 ML20154E356 ML20154E392 ML20154E431 ML20154E484 ML20154E507 ML20154E577 ML20154E597 ML20154E600 ML20154E634 ML20154E666 ML20154E684 ML20154E762 ML20154E785 ML20154E809 ML20154E821 ML20154E871 ML20154E878 ML20154E908 ML20154E958 ML20154E967 ML20154E977 ML20154F001 ML20154F024 ML20154F073 ML20154F094 ML20154F104 ML20154F116 ML20154F123 ML20154F135 ML20154F145 ML20154F153 ML20154F156 ML20154F390
References
FOIA-88-156 NUDOCS 8805200140
Download: ML20154E240 (4)

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July 21, 1970 1 Pacific Cas & Electrie Company I 245 Market Street San Francisco, California 94106 Attention: Mr. Richard M. Peterson Senior Vice-President i l

Centlement l I

This letter relates to the discussion Messrs. A. D. Johnson and J. L.

Crews of this office held with Mr. W. R. Hersey and other esebers of your staff at the conclusion of the inspection conducted on June 23 through June 26,1970, regarding the construction activities authorized by AEC  !

Construction Permit No. CPPR-39  !

l As noted during the discussion, an apparent deficiency was identified '

involving an item not in conformance with statemento in the Preliminary Safety Analysis Report as identified below, or which coy otherwise raise questions concerning the adequacy of construction of the Diablo Canyon, Unit 1, facility. This item is as follows:

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The Preliminary Safety Analysis Report Section 5.2.1.2(s), states, regarding radiographic inspection of the containment building linct, that "... Liner plate seam velds in the cylindrical walls and done will be spot radiographed...". The project quality control program relating to the radiographic inspection of the liner plate sears welds requires that the radiographic technique be in sccordance with the requirements of the ASME Boiler and Pressure Vessel Ccde.

Section VIII, Paragraph W-51.

Cur inspector observed in the case of two horizontal liner plate seam welds, designated 2H and 3H, that the finished surface of the reinforcement in several locations which had been radiographed was -

not in accordance with the requirements of Paragraph W-51. Spect-fically, the thickness of the reinforcement was measured to be as much as 1/8-inch on these veld joints. Paragraph W-51(a) limits the thickness of the reinforcement to 1/16-inch on weld jo(nts with the place thickness (3/8-inch) involved in veld seses 2H sad 3H.

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m R. M. Peterson 2 July 21, 1970 Please provide us within 30 days, with your cosaments concerning this item

and any steps which have been or will be taken to correct it and to minimise i

recurrences of a similar nature, including any appropriate changes that l have been or will be made to your quality assurange program.

Should you have any questions concerning the matters discussed in this letter, please feel free to consamicate directly with this office.

Very truly yours.

Origmal Sigr.eJ $

R. W. Smith R. W. Smith Director ect D. V. Kelly, Chief Mechanical Engineer

_ Drcft 7/8/70 ,

J. L. Crews

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I Pacific Gas & Electric Company

. 243 darket Street San Francisco, California 94106 Attention: Mr. Richard M. Peterson

Senior Vice-President i, Gentlemen:

This letter relates to the discussion Hessrs. A. D. Johnson and J. L.

i Crews of this of fice held with Mr. W. 'R. Hersey and other members of your staf f at the conclusion of the inspection conducted on June 23 through Jutte 26, 1970, regarding the/ construction activities authorized by AEC Construction Permit No. CPPR-39. '

As noted during the discussion, an apparent deficiency was identified involving an item not in conformance with statements in the Preliminary Safety Analysis Report as identified below, or which may otherwise raise questions concerning the adequacy of construction of the Diablo Canyon, Unit 1, facility. This item is as follows: .

The Preliminary Safety Analysis Report. Section 5. 2.1. 2 a) , states ,

regarding radiographic inspection of the containment buildin $at

"... Liner plate seas welds in the cylindrical walls and done will be spot radiographed...". The project quality control program relating to the radiographic inspection of the liner plate seam welds requires "

that the radiographic technique be in accordance with the requirements Il ,

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• - of the ASMI Boiler and Pressure Vessel Ccde,Section VIII, Paragraph W 51.

L., k our'inskeYo'r"observed in the case of two horizonal liner plate seas welds, designated 2H and 38, that the finished surf ace of the reinforcement in several locations which had been radiographed was not in accordance with the requiretsents of Paragraph W-51. Specifically, the thickness of the reinforcement was measured to be as much as k-inchontheseweldjoints.

Paragraph W-51(a) limits the thickness of the reinforcement to (6-inch on weld joints with the plate thickness ( finch) involved in veld cess 6 2H and 3H.g .

Please provide us within.30 days, with y.our cotaments concerning this item and any steps which have been, or will be taken to correct it and to minimize recurrences of a similar nature, including.any appropriate changes that have been or will be made to your quality assurance program. ,

Should you have any questions concerning the matters discussed in this letter, please feel free to communicate directly with this office.

Very truly yours, f R. W. Smith ,

Director cc: D.V. Kelly, Chief Hechanical Engineer

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