ML20137V233
| ML20137V233 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 09/13/1985 |
| From: | Martin T Public Service Enterprise Group |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8510030422 | |
| Download: ML20137V233 (2) | |
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Pubhc Service Electric and Gas Company Thomas J. Martin 80 Par k Plaza, Nw. ark, NJ 07101 201-430-831G Mailing Address. P.O. Box 670, Newark, NJ 07101 Vice President Engineenng and Construction September 13, 1985 i
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i Dr. Thomas E.
Murley, Administrator U.
S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue j
King of Prussia, Pennsylvania 19406
Dear Dr. Murley:
i SIGNIFICANT CONSTRUCTION DEFICIENCY HEAT BUILD-UP IN EDG CABINETS HOPE CREEK GENERATING STATION I
On April 3, 1985, a verbal report was made to Region I, Office of Inspection and Enforcement representative, Mr.
E.
l Kelly, advising of a significant construction deficiency I
concerning heat build-up due to three (3) transformers mounted inside the Generator Control Cabinets.
On May 6 and August 7, 1985, interim reports were sent to your 1
office.
The following interim report is provided in i
accordance with 10CF250.55(e).
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Onsite tests confirm that temperatures within the Hope Creek generator potential and excitation control panels, as designed, would exceed the qualified limits of the exciter 4
i transformer insulation.
Failure of the insulation would short circuit the transformer coil resulting in loss of j
excitation current to the generator.
Loss of power from the j
Emergency Diesel Generators would adversely affect safe i
shutdown of the plant under emergency conditions.
We there-j fore consider the subject condition to be reportable in accordance with 10CFR50.55(e).
In accordance with Colt Industries' recommendations, we plan to replace the center current transformer (CT) with a CT that presents a larger surface area to the airf1qw and Bechtel has prepared Design Change Package No. 7079 to increase and redirect the airflow through the control
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panel.
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Dr.
T.
E.
Murley 2
9/13/85 We expect to provide you with a final report on this issue by November 1, 1985.
Very truly yours, C
Office of Inspection and Enforcement Division of Reactor Construction Inspection Washington, D.
C.
20555 NRC Resident Inspector - Hope Creek P.
O.
Box 241 Hancocks Bridge, NJ 08038 Records Center Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, GA 30339 l