ML19246A698
| ML19246A698 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities, Zion  |
| Issue date: | 05/17/1979 |
| From: | Reed C COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-79-09, IEB-79-9, NUDOCS 7907060251 | |
| Download: ML19246A698 (2) | |
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Commonwealth Edison
'1 One First National Plaza Chicago llhnos F Address Resy to Post Off,ce Box 767 A
Chicago, Illinois 60690
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May 17, 1979 Mr. James G. Keppler, Director Directorate of Inspection and Enforcement - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Subject:
Dresden Station Units 1, 2 and 3 Quad-Cities Station Units 1 and 2 Zion Station Units I and 2 Response to IE Bulletin 79-09
" Failures of GE Type AK-2 Circuit Breaker in Safety-Related Systems" NRC Docket Nos. 50-10, 50-237, 50-249, 50-254, 50-265, 50-295 and 50-304 Reference (a) :
J.G.
Keppler letter to B. Lee, Jr.
dated April 17, 1979
Dear Mr. Keppler:
Reference (a) transmitted IE Bulletin 79-09 concerning the use of GE type AK-2 circuit breakers in safety-related systems.
This transmittal constitute' qur response to that bulletin for our Dresden, Quad-Cities, and Zion Generating Stations.
At Zion Station, there are no GE type AK-2 circuit breakers in use or planned for use in any safety-related systems.
Consequently, no further response is required.
At Dresden and Quad-Cities Stations, the use of GE type AK-2 circuit breakers has been identified in safety-related systems.
The breakers are used in the 480 volt feeds from safety-related buses to motor control centers, 480 volt safety-related bus ties, and supplies to various safety related 480 volt equipment.
However, none of these circuit breakers utilize the under-voltage tripping devices described in Bulletin 79-09 and its attached GE Service Advice Letter No. 175.
The under-voltage tripping devices in uce at Dresden and Quad-Cities are designed and operated in a totally different manner than those described.
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Commonwealth Edison l
M"- James G. Keppler: May 17, 1979 In addition, a preventive maintenance program is in place, and the existing maintenance procedures were written through the use of the applicable GE instruction manual procedures refer to the instruction manuals for detailed checks These on the circuit breakers.
As indicated above, tripping devices identified by this bulletin are not in usethe under-voltage and the GE Service Advice Letter No. 175 has been determined to be not applicable.
Based on the above, we conclude that no further response or action is required at this time.
this matter to this office.Please address any questions you may have concern Very truly yours,
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i Cordell Reed Assistant Vice-President cc:
Director, Division of Reactor Operations Inspection t r, cnq
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