ML20127E311
| ML20127E311 | |
| Person / Time | |
|---|---|
| Site: | Mcguire, Catawba, Pilgrim, McGuire, 05000000, Barnwell |
| Issue date: | 06/19/1985 |
| From: | Laughlin J HEVI-DUTY/NELSON (FORMERLY NELSON ELECTRIC CO.) |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-85, REF-PT21-85-288-000 PT21-85-288, PT21-85-288-000, NUDOCS 8506240517 | |
| Download: ML20127E311 (3) | |
Text
U-9 NELSON ELECTRIC p.O Box 72 6. TULS A. OKLAHOM A 7 4101. PHON E 918 6 2 7-S S 30. TE L E X 492424 June 19, 1985 Director, Office of Inspection & Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Subject:
Possible safety hazard Regulation 10 CFR Part 21 Gentlemen:
Under the requirements of the above regulation, we wish to report an apparent defect with a component supplied by us to nuclear facilities.
This defect could create a possible safety hazard.
This information was reported to Mr. Ray Smith of your office on June 18, 1985, by telephone by our Mr. John R. Laughlin.
The generating stations involved are as follows:
Duke Power Company General Office:
P.O. Box 33189 Charlotte, N.C. 28242 (1) McGuire Nuclear Station Cowans Ford, North Carolina (2) Catawba Nuclear Station Newport, South Carolina Boston Edison Company General Office:
800 Boylston St.
Boston, Ma. 02199 (3) Pilgrim Station, Plymouth, Mass.
Allied General Nuclear Services General Office:
P.O. Box 847
- Barnwell, S.C. 29812 (4) Plant location: Barnwell, South Carolina (Note:
this facility was built for fuel re processing, but has never been commercially activated and currently has no operating license).
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A UNIT OF GENERAL SIGNAL
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Pags 2 June 19, 1985 The equipment involved is Nelson Electric Class 1035 Low Voltage Motor Control Centers.
The motor starter units in these control centers include a commercial grade control power transformer component procured from Hevi-
- Duty Electric. Company, Goldsboro, North Carolina.
Reference (1) and (2) above were provided with Hevi-Duty type SBW transformers and reference (3)
.and (4) were provided with Hevi-Duty type SZO transformers.
Reference (1) above advised us on June 14, 1985, that they have detected a condition wherein the identification nameplate attached to the transformer separates and falls away from the transformer.
This nameplate is attached to the transformer with an adhesive material.
The nameplate is made of aluminum, and when separated from the transformer, could contact electrical live parts and possibly cause a short circuit or operational malfunction.
Nelson Elechic supplied the control centers to purchaser specifications.
In each case, the purchaser retained responsibility for operational schemes.
Therefore, Nelson Electric is not in position to determine whether any specific safety hazard has been created or could be created, or the precise nature of any such hazard.
Approximate quantities of control power transformers supplied to the reference facilities.for safety related applications are as follows:
(1) 400 (2) 600 (3) 175 (4) 75 We are presenting the following options to the affected plant owners in order that they may select the corrective action they may wish to takes (a) Attach nameplates which have separated, and augment the attachment of others, to the transformer by installing mechanical fasteners such as drive screws or pop rivets.
(b) Remove nameplates and replace with new nameplates using new adhesive.
(c) Remove and relocate nameplates to a position adjacent to the transformer, attaching with mechanical fasteners.
(d) Remove and discard all nameplates and enter identifying information in record files.
l Plant owners are being advised that the Hevi-Duty Company has changed the type of adhesive used to attach the nameplate to the transformer.
The new adhesive overcomes the possibility that nameplates might separate from the transformer, and such transformers are not subject to any of the corrective actions outlined above. Transformers employing the new adhesive were produced starting with the 4th quarter of 1979 and can be identified by date code markings appearing on the transformer terminal. block or core.
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.Page 3 June 19, 1985 This marking ends with three digits such as "381" indicating the transformer
'was-produced in the 3rd quarter of 1981.
Thus, any markings of "479" or later mean that the transformer is free of the subject defect and no corrective action is recommended.
If further information is desired, please let us know.
Yours very truly,
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(W John R. Laughlin Se'nior Consultant JRL/alw 4
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