ML19262B472

Responds to IE Bulletins 78-12,78-12A & 78-12B, Short Period Scrams at BWR Facilities. No Deviations Found in Welding Matl Used in Vessels

ML19262B472
Person / Time
Site:	Prairie Island
Issue date:	12/11/1979
From:	Wachter L NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
IEB-78-12, IEB-78-12A, IEB-78-12B, NUDOCS 7912280041
Download: ML19262B472 (2)

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NSD NORTHERN STATES POWER COMPANY M I N N E A PO Li s. M I N N E S OTA 55401 December 1., 1979 Mr James G Keppler Director - Region III Of fice of Inspection and Enforcement United States Nuclear Regulatory Commission Glen Ellyn, IL 60137

Dear Mr Keppler:

PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 Response to IE Bulletins 78-12,78-12A, and 78-12B dated September 29, 1978, November 24, 1978, and March 19, 1979 IE Bulletin 78-12 described an event which occurred at another facility in which weld wire used in some reactor vessel welds was different than the weld wire called for in the design specifications. We were asked to supply, within 60 days, a variety of information concerning the weld material and procedures used in the fabrication of the Prairie Island vesseis. IE Bulletins78-12A and 78-12B subsequently modified the type of information to be provided and allowed more time to gather and submit it.

In compliance with the subject bulletins, Westinghouse Electric corporation requeited Creusot-Loire to conduct a records investigation of the weld materials and procedures used in the fabrication of the Prairie Island vessels. Creusot-Loire has now completed t' s required investigation and prepared a report entitled, " Certified Records Investigation for NSP and NRP Vessels." This report was submitted to the NRC by Westinghouse on November 30, 1979. The report states that no deviations were found in the welding material used in the Prairie Island vessels.

Westinghouse has reviewed the Creusot-Loire report and has found it to conform to the requirements of the ASME Code, Westinghouse vessel specifi-cations, and the NRC Bulletins.

1648 076 DEC 131979 7912280 0Q

4 NORTHERN STATES POWER COMPANY Mr James G Keppler December 11, 1979 Page 2 As stated in their report, Creusot-Loire has no archive material for the welds included in their investigation. Westinghouse also inventoried their archive weldment material and determined that none is available.

Please contact us if,you require additional information concerning our response.

Yours very truly, LJ achter Vice President Power Production and System Operation ec: Mr G Charnoff NRC Office of Inspection and enforcement Washington, DC 1648 077

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