ML19329E411
| ML19329E411 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 12/06/1974 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 8006120739 | |
| Download: ML19329E411 (1) | |
Text
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l UNITED STATES I
ATOMIC ENERGY COMMISSION j.
yQQ DIRECTORATE OF REGULATORY OPERATIONS b
V.
REGION ll1
- strs et 799 ROOSEVELT ROAD
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ymmg GLEN ELL.vN. ILLINOIS 60137 (312) 858-2660 December 6, 1974 Consumera Power Company Doeket No. 50-329 ATIN: Mr. Stephen H. Howell Docket No. 50-330 Vice President 1945 West Farma11 Boed Jackson, Firki==
49201 1
Geselm===:
The enclosed RO Bu11stia requests action by you with regard to your power remator facilities with operating license or sonstruction permit.
should you have questions regarding this Bulletin or satises requested of you, please sentact this office.
Sincerely yours, James C. Kappler Regional Director
Enclosure:
RD Bulletin No. 74-15
" Approved by Cdo, B-180225 (R0072), clearanes expires 7-31-77.
Approval was given under a blanhat clearance specifiamily for identified generic probleme."
bec: DR Central Files
$g THIS DOCUMENT CONTAINS Files Local PDR P0OR QUAUTY PAGES OGC, Beth, P-506A (cC) (2)
Ronald Callen Dr. Wayne E. North Myron M. Cherry 80061207'3p
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December 6, 1974 R0 Bulletin No. 74-15 MISAPPLICATION OF CUTLER-HA"MER THREE POSITION MAINTAINED SWITCH MODEL NO. 10250T An abnormal occurrence report submitted by the Wisconsin Public Service Corporation indicates a potential problem with Cutler-Hammer switches of Model No. 10250T which could effect the performance of control systems in which they are used.
Description of Circumstances:
The emergency diesel generators at Kewaunee Nuclear Power Plant received One of the dies'ls failed to start even an automatic start signal.
e though the local mode switch appeared to be in the "AUT0" position.
Investigation by the licensee revealed a " dead" area between the "0FF" and "AUT0" positions of the Cutler-Hammer three position maintained switch, Model No. 10250T4023.
It was determined that the switch could be positioned so that it appeared to be in "AUT0" but was actually in a position between "AUT0" and "0FF" such as to prevent either automatic starting of the diesel or actuation of the "NOT IN AUT0" annunciator.
The same switch was installed on each of the two General Motors diesel generators supplied to the Kewaunee plant by the Western Engine Corporation.
Investigation by the AEC has revealed the use of Cutler-Hammer Model No.
10250T4023 switches in control panels for Fairbanks Morse diesel genera-tors at one power reactor facility and in the emergency switching logic for the hydro emergency power source at another.
While this potential problem has been identified with the use of the Cutler-Hammer Model No. 10250T4023 switch, all switches of the basic Cutler-Hammer three position maintained Model No. 10250T are subject to potential malfunction similar to that described above.
Action Requested of Licensees: '
Review the use, or planned use in the case of facilities under construc-tion, of Cutler-Hammer three position maintained switches of basic Model No. 10250T in safety-related systems of your power reactor facilities, and:
1.
If such switches are in use, or planned for use, in s.afety-related systems, notify this office in writing within 30 days of the extent of their use and what action you have taken or plan to take to pre-vent malfunction of the type descrftsj ibove. Your written notifica-tion should include the date(s) when your actions in response to this Bulletin were or will be completed.
2.
If you find from your review that switches of the type described above are not in use, or planned for use, in safety-related systems g
of your power reactor facilities notify this office of this finding within 30 days.
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