ML19259C434

Responds to IE Bulletin 79-03 Re Use of Fusion Welded Pipe Spools Mfg by Youngstown Welding & Engineering Co.No Such Pipe Spools Have Been Shipped to Facility

ML19259C434
Person / Time
Site:	05000484
Issue date:	05/11/1979
From:	Dienhart A NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NLR3-08, NLR3-8, NUDOCS 7906220001
Download: ML19259C434 (2)

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NSP NORTHERN STATES POWER COMPANY EAU CL AIRE, WISCONSIN 84709

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May 11, 1979 NLR3 - 08 Mr J G Keppler, Director Office of Inspection and Enforcement U S Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 g

TYRONE ENERGY iskK E-7470 Docket No. STN Q-484 Dear Mr Keppler Your letter dated March 12, 1979 forwarded for review and action IE Bulletin No. 79-03 concerning ASME SA-312 type 304 fusion welded stainless steel pipe spools manufactured by Youngstown Welding and Engineering Company. The fol-lowing information concerning the use or potential use of fusion welded pipe spools manufactured by Youngstown has been developed and is fomarded as an interim response to the subject Bulletin. This information has been developed generically to all five SNUPPS units. The SNUPPS units are Callaway I and II, Wolf Creek, Sterling, and Tyrone Energy Park. The need for additional actions applicable specifically to Tyrone Energy Park will be indicated in a follow-up response. The items below are numbered to coincide with action items listed in the NRC Bulletin.

1. A survey of current SNUPPS suppiiers of pipe spools and pre-assembled pipe formations indicates that only Dravo Corporation, Marietta, Ohio, has supplied pipe spools containing fusion welded SA-312 type 304 pipe (without filler material) manufactured by Youngstown Welding and Engineering Company. To date, the total number of Dravo-supplied pipe spools shipped to Callaway and Wolf Creek sites containing Youngstown-manufacture'd materials is 65 and 70, respectively. To date there have been no pipe spools of any type fabricated for or shipped to Sterling or Tyrone sites. Dravo is currently in the process of identifying other spools in fabrication which they plan to ship to SNUPPS jobsites and which contain the referenced fusion welded pipe.

This review process can be expected to continue over the next several months to obtain sufficient data concerning the quality and acceptability of the Youngstown pipe being furnished for SNUPPS.

2281 002

, 1 4 1979 79062200D/'

NORTHERN STATES POWER COMPANY I Page 2 6

May 11, 1979 Mr J G Keppler 2.

As indicated in item 1 above, a total of 65 and 70 pipe spools containing fusion welded SA312 type 304 pipe manufactured by Youngstown have to date been shipped to Callaway and Wolf Creek sites, respectively. A listing indicating pipe spools currently in fabrication for shipment to the Tyrone jobsite will be furnished in a follow-up to this interim report.

3.

Each longitudinal weld seam of fusion welded SA312 type 304 pipe manufactured by Youngstown and presently on site at Calla-way and Wolf Creek plants will be ultrasonically examined. This examination will be limited only by accessibility considerations which. according to preliminary site data, will impact fewer than 10 percent of the total number of spools previously installed.

The examination procedure, reference standards, and acceptance criteria shall be performed in accordance with Paragraph NC-2552 of the 1977 edition of ASME Section III Code. Any repairs re-quiring welding shall be in accordance with Paragraph NC-2559 of the 1977 edition of the ASME Section III Code. The preceding on-site examinations will be performed over the next 60 days and the results tabulated for transmittal to NRC.

Ultrasonic examinations will also be performed on all pipe spools presently in fabrication at Dravo containing fusion welded SA312 type 304 pipe. Acceptance criteria and repair provisions will be the same as indicated above. The results of these additional examinations as they relate to Tyrone Energy Park will be included in a follow-up to this interim report.

4.

This item is applicable to holders of operating licenses only.

5.

The ultrasonic examinations being performed at Callaway and Wolf Creek sites are scheduled for completion within the next 60 days and will be referenced into a follow-up to this interim report.

The results of ultrasonic examinations of pipe currently in fabrication at Dravo will also be referenced in the follow-up report which is presently scheduled for transmittal to NRC by August 10, 1979. The need for further corrective actions will be indicated in the follow-up response.

Yours very truly 3 '

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PE Arthur V Dienhart Vice President Tyrone Energy Park Project cc U S Nuclear Regulatory Corrmission 228 003 Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D C 20555