ML20087K353
| ML20087K353 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 03/14/1984 |
| From: | Wells D DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| EF2-67820, IEB-83-08, IEB-83-8, NUDOCS 8403260127 | |
| Download: ML20087K353 (4) | |
Text
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!! arch 14,1984 EF2-67820
!!r. James G. Keppler Regional Administrator U. S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137
Reference:
Fermi-2 USNRC Licensing Docket:
50-341 USNRC IE Bulletin 83-08 (12-28-83)
Subj ect:
Detroit Edison Response to NRC IE Bulletin 83-08
Dear Mr. Keppler:
In response to the subject bulletin request, we hereby submit the enclosed report on Detroit Edison's investigation of the concerns expressed therein.
Should you require additional information from Detroit Edison in this matter, please advise us.
Very truly yours, i
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DAW:JDR/new enclosure 8403260127 840314 J 6 if PDR ADOCK 05000341 Il G
Mr. James G. Keppler March 14, 1984 EF2-67820 Page 2 cc: Director, Division of Reactor Construction Inspection Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Mr. Paul Byron Senior Resident Inspector U. S. Nuclear Regulatory Commission Resident Inspector's Office 6450 Dixie liighway Newport, Michigan 48166 Mr. M. D. Lynch Division of Licensing Office of Nuclear Reactor Regulation U. S. Nucicar Regulatory Commission Washington, D. C. 20555 Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C.
NI Edisvu RESPONSE TO BULLETIN 83-08 The IE Bulletin 83-08 discusses the failures and problems that have been identified with the possible improper operation of circuit breakers with undervoltage trip attachments. The subject breakers and associated problems have been previously addressed in reviews of IE Bulletins 79-09, 83-01 and 83-04, as well as IE Notice 83-76.
The problems discussed in these articles referred to the General Electric (GE) type AK-2 and Westinghouse (W) type DB and DS breakers. These were usually associated with poor lubrication, maintenance or adjustment of the breakers, or binding or out of adjustment conditions in the UV device or linhage.
The following are the actions required in the IE Bulletin 83-08 and our response to each of these actions:
Action 1.
Identify applications of h[ type DB, }[ type DS, or CE type AK-2 circuit breakers with the UV trip feature, as discussed in IEB 83-01 or 83-04 in safety-related applications at your facility, other than as RTB's.
CP holders and licensees should also identify similar applications of other types of breakers, by other manu-facturers, that use a UV trip feature.
If such circuit breakers are used or planned for use, identify the system (s) involved.
Response
Fermi-2 does not employ 1[ type DB, }[ type DS, or GE type AK-2 circuit breakers in any safety-related system. To assure that this statement is not negated in the future, these items have been added to the Fermi-2 " Restricted Materials / Equipment / Services List."
We do use Brown Loveri (formerly ITE) 480V low voltage circuit breakers on the plant safety-related power buses 72 B, C, E, F, EA, EB, EC and ED.
These breakers were purchased with an electro-mechanical under-voltage trip device. During the initial testing of the devices, it was determined that the devices did not provide sufficient adjustment for dropout voltage and time delay range to coordinate with the existing bus undervoltage tripping schemes.
As a result of this determination, design change documents -
Field Modification Requests (FMRs) were issued by Engineering to remove the UV trip device from the breakers.
This removal work has been completed by the Startup Group, and the breakers have satisfactorily passed the subsequent Generic Checkout and Initial Operation Test, (Procedure
- CAIO.000.024 - "480 v. Switchgear Breakers").
t Response to IE'Bulletin 83-08 Page 2 Undervoltage tripping of the safety-related buses is now provided by bus load shedding strings initiated by Brown Bovert type 27-R undervoltage relays.
This was the only non-RTB application on safety-related equipment that utilized a breaker with UV trip devices.
Action 2.
Action 2, Parts 2a, 2b, 2c, and 2d are not applicable to Fermi-2, as the UV trip devices have been removed.
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