ML20079K078

Third Interim Deficiency Rept,Item 104 Re Welding for 480- Volt Class IE Switchgear & seismically-designed 480-volt non-Class IE Switchgear from Brown-Boveri Electric Co. Initially Reported on 830304.Defective Welds Repaired

ML20079K078
Person / Time
Site:	Harris
Issue date:	01/11/1984
From:	Parsons R CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
CON-NRC-166 104, NUDOCS 8401240506
Download: ML20079K078 (4)

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D CP&L 84 g._igPgg $ 1% Company n-n-_n P. O. Box 101, New Hill, N. C. 27562 January 11,1984 Mr. James P. O'Reilly N RC-166 United States Nuclear Regulatory Commission Region II 101 Marietta Street, Northwest (Suite 2900) '

Atlanta, Georgia 30303 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KW - UNIT 1 DEFECTIVE WELDS ON 480V SWITCHGEAR, PURCHASE ORDER NY-435171, ITEM 104

Dear Mr. O'Reilly:

Attached is our third interim report on the subject item which was deemed reportable per the provisions of 10CFR50.55(e) on March 4,1983. CP&L is pursuing this matter, and it is currently projected that corrective action and submission of the final report will be accomplished by July 31,1984.

Thank you for your consideration in this matter.

Yours very truly, 7/f W R. M. Parsons Project General Manager Shearon Harris Nuclear Power Plant RMP/sh 1

Attachment ec: Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)

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THIRD INTERIM REPORT i

REPORTABLE ITEM - SHNPP WELDING ON 480V SWITCHGEAR PURCHASE ORDER NY-435171 ITEM 104 DDR-1066 JANUARY 13, 1984 REPORTABLE UNDER 10CFR50.55(e) i 8

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SUBJECT:

Shearon Harris Nuclear Power Plant Unit 1.

10CFR50.55(e) reportable deficiency: Welding for 480V Class 1E switchgear and seismically-designed 480V Nonclass 1E switchgear supplied under Purchase Order NY-435171 from Brown-Boveri Electric Co.

ITEM: Welding in the transformer sections of the seismically-designed Nonclass IE switchgear and the Class IE switchgear.

SUPPLIED BY: Brown-Boveri Electric Company, Chalfont, PA.

NATURE OF DEFICIENCY: From April 1982 through July 1982, Brown-Boveri Electric Company shipped 480V switchgear to the Shearon Harris site on Purchase Order NY-435171. At CP&L's request, representatives from Brown-Boveri came to the site in late September 1982 with structural shop drawings so that CP&L QA would have a basis for a visual inspection of welds.

The inspection revealed welding deficiencies (one or more of the following dificiencies: undersized welds, undercut, incomplete fusion, overlap and craters) in the air terminal chambers, transformers and a current limiting reactor. Anlaysis of the welds by Brown-Boveri Engineering determined the welding deficiencies in the air terminal chambers and the current limiting reactor were not serious in nature and that the structural integrity of the equipment would not be affected.

The welding deficiencies in the transformer have not been completely addressed by Brown-Boveri.

DATE PROBLEM OCCURRED: Refer to section above.

DATE PROBLEM REPORTED: March 4, 1983, CP&L (N. J. Chiangi) notified the NRC (C.Hehl) that this item was reportable under 10CFR50.55(e).

SCOPE OF PROBLEdi The deficiencies involve four Unit 1 Class IE 480V switchgear transformers and two Nonclass 1E seismically-designed 480V switchgear transformers.

p *w SAFETY IMPLICATION: Seismic qualification of the Class IE switchgear is required so that power to safety-related loads is maintained during a seismic event. Due to the proximity of Nonclass 1E switchgear to Class IE equipment, seismic qualification (design) of the Nonclass IE switchgear is required in order to assure that no switchgear component will dislodge and possibly damage safety-related components during a seismic event.

REASON DEFICIENCY IS REPORTABLE: Failure of the supplier's QA program to control the welding on the switchgear has resulted in switchgear being shipped to the site which deviated from the supplier's own welding inspection criteria and structural drawings upon which the switchgear qualification is based.

CORRECTIVE ACTION: Brown-Boveri has repaired major defective welds.

Minor defects are to be modeled in the upcoming seismic test. Any corrective action will be determined after review of the seismic test reports. This testing was scheduled for completion by October 1983, but has been delayed due to Ebasco's concerns over the manner in which the equipment is to be tested.

FINAL REPORT: Based on discussions with Ebasco, in order to allow enough time for completion of testing, receiving and review of the test results, we currently project the submittal date for a final report to be July 31, 1984.

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