ML19259C130
| ML19259C130 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 06/06/1979 |
| From: | Utley E CAROLINA POWER & LIGHT CO. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7906120393 | |
| Download: ML19259C130 (2) | |
Text
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_1 can ona aew-r i t..c. 2mm f June 6, 1979 FILE: NG 3514(B)
SERIAL NO: GD-79-1483 Office of Nuclear Reactor Regulation
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2 ATTENTION:
Mr. T. A. Ippolito, Chief Operating Reactors Branch No. 3 United States Nuclear Regulatory Commission Washington, D. C.
20555 BRUNSWICK STEMI ELECTRIC PLANT, UNIT NOS.1 AND 2 DOCKET NOS. 50-325 AND 50-324 LICENSE NOS. DPR-71 AND DPR-62 AMP TERMINATION LUG SLEEVES
Dear Mr. Ippolito:
In a May 25, 1979, telephone call, Carolina Power & Light Company (CP&L) infomed the NRC staff and Region II I&E that CP&L had just become aware of the failure, during environmental testing, of the nylon insulating sleeve portions of the compression-type temination lugs manufactured by AMP.
This information was confirmed to the staff in our May 29, 1979, letter, Serial No. CD-79-1412.
The lug in question is MF Type PIDC, for use with wire sizes 10 through 12.
An evaluation has been made of the possible problems which could result from the failure of the insulating sleeve.
It was assumed that a total deterioration of the sleeve had taken place. Therefore, the temination lugs were considered to be completely uninsulated, which defines the worst condition.
Even in an uninsulated condition, problems can only occur if the lugs were free to rotate underneath the teminal screws far enough to cause contact between adjacent lugs. Rotation is not expected in the seismically qualified terminations used at Brunswick.
As an interim measure, each of the dryvell teminations using the AMP sleeve is being inspected for deterioration of the existing sleeve; this inspection will also ensure that the wire is properly aligned to the teminal block and that the temination screw is tight.
These actions provide assurance for the near term that plant operation may continue without undue risk to the public health and safety.
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Mr. T. A. Ippolito June 6, 1979 At the next refueling outage for each unit, we will implement a permanent solution to the problem. There are several possible permanent solutions; 1.e., new terminal lugs, new insulation sleeves, or other insulation devices which will be evaluated in the interim. During the refueling outages, one of these solutions or a combination of them will be used to effect a permanent, fully qualified solution.
If you have any further questions please do not hesitate to O
call upon my staff.
Yours very truly.
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E E. Utley Executive Vice President Power Supply & Customer Services CSB/mf cc:
Mr. James P. O'Reilly NRC Region IIhf }jf .}}