ML20073A194
| ML20073A194 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 04/04/1983 |
| From: | Wells D DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, EF2-62618, NUDOCS 8304110687 | |
| Download: ML20073A194 (2) | |
Text
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Donald A. Wells Mracer-Ouanty Asswance (313) ~237 WsT Edison Es'nF52-April 4, 1983 EF2-62618 Mr. James G. Keppler, Regional Administrator Region III U.S. Nuclear Regulatory Comnission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Subject:
Report of Potential 10CFR50.55(e) Its on Possible ITE Circuit Breaker Failures (#87)
Dear Mr. Keppler:
On March 4, 1983, Detroit Edison's Mr. D. Ferencz, Acting Supervisor - Con-struction Quality Assurance telephoned Mr. P. Pelke of NRC Region III to report on a potential problem with ITE Circuit Breaker failures at the Fermi 2 site.
A meno was received from the NRC, and described a potential problem with Brown Boveri Electric, Inc. (formerly ITE) low voltage circuit breakers. The probim involves a defective capacitor in the trip circuit which, upon fai-lure, prevents the circuit breaker frm opening during an overcurrent condi-tion.
The Edison Startup Organization has empleted a survey of all solid state trip devices in the 480V switchgear at Fermi 2.
The survey found 130 of these devices equipped with a Type 40D capacitor. This capacitor has been found to degrade over time.
The failure of this capacitor, and in turn the trip device, can result in the failure of a breaker to interrupt a fault. It has, therefore, been deter-mined that the capacitor will be replaced in all 130 devices.
The details of this action and the expected empletion date have not yet been determined.
Another report on this item, either interim or final, will be sent when fur-ther information is available. If you have questions concerning this matter, please contact Mr. G.M. Trahey, Assistant Director - Project Quality Assurance.
Very truly yours, S
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Mr. James G. Keppler, Regional Administrator April 4, 1983 Page M EF2-62618 cc: Mr. Richard DeYoung, Director Office of Inspection and Enforcement
.U.S. Nuclear Regulatory Cmmission Washington, D.C.
20555 Mr. Bruce Little, Senior Resident Inspector U.S. Nuclear Regulatory Comnission 6450 North Dixie Highway Newport, Michigan 48166