ML20094N828
| ML20094N828 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 07/30/1984 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-249 104, NUDOCS 8408160408 | |
| Download: ML20094N828 (4) | |
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L CD&L Carolina Power & Light Company P.O. Box 101, New Hill, N.C.
27562 July 30, 1984 Mr. James P. O'Reilly NRC-249 United States Nuclear Regulatory Commission Region ~II 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 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 l
Dear Mr. O'Reilly:
Attached is our fourth 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 l
that corrective action and submission of a final report will be accomplished by April 1, 1985.
Thank you for your consideration in this matter.
Yours very truly, N
R. M. Parsons Project General Manager Shearon Harris Nuclear Power Plant i
RMP/ jam Attachment cc Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)
Mr. R. C. DeYoung (NRC) l OFFICIAL COPif g4 ggg
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CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 i
2 FOURTH INTERIM REPORT REPORTABLE ITEM - SHNPP WELDING ON 480V SWITCHGEAR PURCHASE ORDER NY-435171 ITEM 104 DDR-1066 JULY 31, 1984 REPORTABLE UNDER 10CFRSO.55(e)
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k-SUBJECT V
'Sh M r:n Harris Nuclocr Power Plcnt Unit 1.
10CFR50.55 (e) l reportabli ' deficiency: Welding for 480V F
l Class-1E switchgear and seismically-designed 480V' Nonclass IE switchgear-supplied under Purchase Order NY-435171 from Brown-BoveriiElectric Co.
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' ITEM:-
Welding in the transformer sections of the f
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seismically-designed Nonclass IE switchgear 'and the'
-Class 1E switchgear.
SUPPLIED BY:
Brown-Boveri Electric Company, Chalfont, PA.
NATURE ~0F i-DEFICIENCY:-
..From April 1982 through July 1982 Brown-Boveri L '
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 I
site in late-September 1982 with structural shop drawings so that CP&L QA would have a basis for a visual inspection of welds.
t The inspection revealed welding deficiencies (one or-l:
more of_the following deficiencies: undersized welds, undercut, incomplete fusion,~ overlap and craters) in the air terminal chambers, transformers, and a current l
limiting reactor. Analysis 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.
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DATE PROBLEM l
REPORTED:--
March 4, 1983, CP&L (N. J..Chiangi) notified the NRC (C. Hehl) that this item was reportable under 10CFR50.55 (e).
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SCOPE OF
~ PROBLEM:
^The deficiencies involve four Unit 1 Class 1E 480V switchgear transformers and two'Nonclass 1E seismically-designed 480V switchgear transformers.
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" SAFETY-U4 PLICATION:
Seismic qualification of the Class 1E switchgear is required so that power to safety-related loads is maintained during a seismic event. Due to the proximity of Nonclass IE switchgear to Class 1E equipment, seismic qualification-(design).of the
-Nonclass 1E 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 dafective 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:
A final report cannot be issued until the transformers are seismically tested and the qualification reports have been reviewed and accepted. Brown-Boveri has rescheduled the seismic test until November 1984.
In order to allow enough time to receive and review the test reports, we must delay the projected submittal date for a final report until April 1, 1985.
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