ML20116F494
| ML20116F494 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 03/28/1985 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-332 104, DDR-1066, NUDOCS 8505010112 | |
| Download: ML20116F494 (4) | |
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Cp&L Carolina Power & Light Company ew Ihh, Nd k7562 P.O.Bo 1 March 28,1985 Dr. J. Nelson Grace NRC-332 United States Nuclear Regulatory Commission Region 11 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KW - UNIT I DEFECTIVE WELDS ON 430V SWITCHGEAR, PURCHASE ORDER NY-435171, ITEM 104
Dear Dr. Grace:
Attached is our final report on the subject item, which was deemed reportable per the provisions of 10CFR50.55(e) on March 4,1983. With this report, Carolina Power and Light Company considers this matter closed.
If you have any questions regarding this matter, please do not hesitate to contact me.
Yours very truly, N
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R. M. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant RMP/sae Attachment cc:
Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)
Mr. R. C. DeYoung (NRC) 8505010112 850328 ADOCK0500gO DR i
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CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 FINAL REPORT REPORTABLE ITEM - SHNPP WELDING ON 480V SWITCHGEAR PURCHASE ORDER NY-435171 ITEM 104 DDR-1066 March 4, 1985 REPORTABLE UNDER 10CFR50.55(e) 4 WKJD06 k.
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SUBJECf:
Shearon Harris Nuclear Power Plant Unit 1.
10CFR50.55(e) reportable deficiency: We.1 ding for 480V Class 1E switchgear and seismically-designed 480V Nonclass 1E switchgear supplied under Purchase Order NY-435171 from l
Brown-Boveri Electric Co.
ITEM:
Welding in the transformer sections of the seismically-designed Nonclass 1E switchgear and the class 1E switchgear.
SUPPLIED BY:
Brown-Boveri Electric Company, Chalfont, Pennsylvania 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 deficiencies:
undersized welds, undercut, incomplete fusion, overlap and craters) in the air terminal chambers, transformers, and a current 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 intergrity of the equipment would not be affected.
DATE PROBLEMS OCCURRED:
Refer to previous section.
DATE PROBLEMS REPORTED:
March 4, 1983, CP&L (N.J. Chiangi) notified the NRC (Mr. A. Hardin) that this item was reportable under 10CFR50.55(e).
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s SCOPE OF PROBLEM:
The deficiencies involve four Unit 1 Class IE 480V switchgear transformers and two Nonclass 1E seismically-designed 480V switchgear transformers. One Nonclass 1E transformer was subsequently replaced.
SAFETY IMPLICATION 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 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:
Corrective action has been accomplished through the repair of weld defects and/or corrections made to structural shop drawings by Brown-Boveri and approved by the Harris Plant Engineering Section. This combination of repair / rework and documentation correction / analysis was undertaken in lieu of seismic testing of a prototype as previously planned.
Brown-Boveri has informed CP&L that a new program of documented weld inspections has been implemented in their factory, which should reduce field inspection time and provide more complete documentation in the future.
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WKJD06