ML20101B653
| ML20101B653 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 11/28/1984 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| SBN-733, NUDOCS 8412200434 | |
| Download: ML20101B653 (3) | |
Text
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a SEABROOK STATION
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Pubec Service of k g November 28, 1984 Now Hampshire Yenkee Divleien SBN-733 T.F. Q2.2.2 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 Attention:
Mr. Pichard W. Starostecki, Director Division of Project and Resident 1 weams' ' ' ' " * '
"~"' '~
References:
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) Westinghouse Letter, dated September 14, 1984, Number NS-EPR-2961, E. P. Rahe, Jr. to R. C. DeYoung (NRC, I&E)
(c) Westinghouse Letter, dated September 26, 1984, Number NS-EPR-2965, E. P. Rahe, Jr. to R. C. DeYoung (NRC, I6E)
(d) Telecon of October 18, 1984, A. L. Legendre, Jr. to A. Cerne (Seabrook Senior Resident Inspector)
Subject:
Interim 10CFR50.55(e) Report Ferroresonant Transformer Deficiencies in Westinghouse 7.5 kVA Inverters Dear Sir On October 18, 1984, a potentially reportable 10CFR50.55(e) item was reported [ Reference (d)] regarding component deficiencies in General Electric ferroresonant transformers used in Westinghouse inverters. The following is an interim report concerning this subject:
DESCRIPTION OF DEFICIENCY References (b) and (c) described the following two problems with Ceneral Electric ferroresonant transformers used in Westinghouse inverters:
1.
Tuning capacitor connections may be incorrect.
" Fast-on" terminals may have been connected to a solder lug instead of the correct fast-on lug. Although electrically correct, the mechanical connection may not be as tight as it should be and could separate during a seismic event.
2.
The center Icg of the transformer reactors may lack suf ficient securing to prevent the leg f rom shif ting and vibrating due to the magnetic forces encountered while the transformer is energized.
This mechanical stress could cause an insulation breakdown to ground.
h DO O
8 P.O. Box 300. Seabrook.NH03874
- Telephone (603)474-9521
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United : states Nuclear Regulatory Commission Attention:. Mr. Richard W. Starostecki, Director Page 2 SAFETY INFLICATION These Westinghouse 7.5 kVA inverters are used to supply the four 120 V ac vital instrument buses.
Failure of the inverters caused by the above two deficiencies would cause the output voltage to drop to 60 - 65 volts. This decreased voltage could cause equipment supplied from the inverter to i
malfunction.
CORRECTIVE ACTION Westinghouse is issuing Technical Bulletins which will describe how to inspect and test the inverters to determine if tite a' wave 'defYCithdiet exist.-^"
If the deficiencies are found in the Seabrook inverters, this will be considered a reportable ites and the rework instructions in the Technical Bulletins will be implemented to correct the deficiencies.
This letter is being filed pursuant to the interim reporting provision of 10CFR50.55(e)(3).
Very truly yours, John DeVincentis, Director Engineering and Licensing cc Atomic Safety and Licensing Board Service List 1
l w
Wilfiam S. J rdan, III Diana Curran Harmon, Weiss & Jordan 20001 S Street N.W.
Brentwood Board of Selectmen Suite 430 RED Dalton Road Brentwood, New Hampshire 03833 Washington, D.C.
20009 Robert G. Perlis Of fice of the Executive Legal Director Edward F. Meany U.S. Nuclear Regulatory Commission Designated Representative of Washington, DC 20555 the Town of Rye 155 Washington Road Robert A. Backus, Esquire Rye, NH 03870 116 Lowell Street F.0. Box 516 Calvin A. Canney Mancehster, NH 03105 City Manager City Hall Philip Ahrens, Esquire 126 Daniel Street Assistant Attorney General Portsmouth, NH 03801 Department of the Attorney General Augusta ME 04333 Dana Bisbett Esquire
,_,_~.______,,m Assistant Attorney General Mr. John B. Tanner Office of the Attorney General Designated Representative of 208 State House Annex the Town of Hampton Concord, NH 03301 5 Morningside Drive Hampton, NH 03842 Anne Verge, Chairperson Board of Selectmen Roberta C. Pevear Town Hall Designated Representative of South Hampton, NH 03642 the Town of Hampton Falls Drinkwater Road Patrick J. McKeon Hampton Falls, NH 03844 Selectmen's Office 10 Central Road Mrs. Sandra Cavutis Rye, NH 03670 Designated Representative of the Town of Kensington Carole T. Kagan, Esq.
RFD 1 Atomic Safety and Licensing Board Panel East Kingston, NH 03827 U.S. Nuclear Regulatory Commission Jo Ann Shotwell, Esquire Assistant Attorney General Mr. Angie Machiros Environmental Protection Bureau Chairman of the Board of Selectmen Department of the Attorney General Town of Newbury One Ashburton Place,19th Floor Newbury, MA 01950 Boston, MA 02108 Town Manager's Of fice Senator Cordon J. Humphrey Town Hall - Triend Street U.S. Senate Amesbury, Ma.
01913 Washington, DC 20510 (Attn Tom Burack)
Senator Cordon J. Humphrey 1 Pillsbury Street Diana P. Randall Concord, NH 03301 70 Collins Street (Attnt Herb Boynton)
SEabrook, NH 03874 Richard E. Sullivan, Mayor Donald E. Chick City Hall Town Manager Newburyport, MA 01950 Town of Exeter 10 Front Street Exeter HH 03833 l
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