ML20031B968
| ML20031B968 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 09/09/1981 |
| From: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| To: | Knop R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 10CFR50.55E, IEC-80-01, IEC-80-1, QA-1482, NUDOCS 8110060286 | |
| Download: ML20031B968 (2) | |
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4 THE CINCINNATI GAS & ELECTRIC COMPANY C
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September 9, 1981 QA-1482 E. A, BORGMAN N CINfON V4CE FRESIDENT U. S. Nuclear Regulatory Commission c
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Region III e
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h' If Glen Ellyn, Illinois 60137 54 I
11 6 Jog Attention:
Mr. R. C. Knop, Act'ing Chief 48A
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Reactor Construction and Engineering Support Branch RE:
9M. H. ZIMMER NUCLEAR POWER STATION - UNIT I E
NRC CIRCULAR dG-01, GENERAL ELECTRIC COMPANY C
RELAYS WITil PETROLEUM JELLY LUBRICATED TIME DIALS, 10CFR50.55(e) ITEM E-9, W.O.
- 57300-957, JOB E-5590 Gentlemen:
This letter is intended to update our interim report dated Septmber 11, 1980, concerning General Electric Company type IAC Induction Disc Relays with petroleum j elly lubricated time dials.
As stated in the previous report, our investigation identified a total of one hundred and ninety-six (196) type IAC relays and nine (9) type IJCV relays which are to be x eplaced.
All of the replacement relays have been received and are currently being installed. As of August 20, 1981, one hundred and twenty-eight (128) of these relays have been tested, calibrated and installed. An additional thirteen (13) relays have been calibrated and tested. We estimate that replacement of the relays will be completed in five (5) weeks.
However, General Electric has verbally informed us that there is a possibility that twenty-six (26) relays with 0.5-4.0 ampere current taps (Catalog #IAC51A801A) were shipped with a manufacturing defect. Apparently only one turn of insulation was utilized on current transformers in some units instead of three turus as required by the design. General Electric also stated that the NRC had been in-formed of the potential problem. We have requested additional information from General Electric on this matter.
1s*I 81100e0286 810909 PDR ADOCK 05000358 S
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Mr. R. C. Knop, Acting Chief Reactor Construction & Engineering Sup.-ort Branch U. S. Nuclear Regulatory Commission Region III September 9, 1981 QA-1482~
Page 2 These potentially defective relays will be replaced, however, delivery is 10-24 weeks. A check revealed that the potentially defective replacement relays of this type had already been installed. However, since these relays have successfully passed a high potential insulation test as part of CG&E's acceptance testing, they will remain in service until the twenty-six (26) additional relays have been received. A final response to this concern will be submitted on Fhrch 30, 1982.
We trust that the above will constitute an acceptable interin status re-port on this item.
i Very truly yours, THE CINCINNATI CAC & ELECTRIC COMPANY h,
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E. A. BORGMANN SENIOR VICE-PRESIDENT MAP:ac cc: NRC Resident Inspector Attn:
W. F. Christianson NRC Office of Inspection & Enforcement Washington, 3. C. 20555 i
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