ML20037B525
| ML20037B525 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities, Zion, LaSalle  |
| Issue date: | 12/06/1974 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Brian Lee COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8010140647 | |
| Download: ML20037B525 (1) | |
Text
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ATOMIC ENERGY COMMISSION
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DIRECTORATE OF REGULATORY OPERATIONS Y
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Docket No. 50 10/
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Docket No. 50-237 Docket No. 50-249 Dammouvealth Edison Ceepony Docket No. 50-295 ATTE:
Mr. Byron Lee, Jr.
Docket No. 50-304 Vice President Docket No. 50-254 F.O. Dez 767 Docket No. 50-265 Chisago, T114=ais 60690 Docket No. 50-373 Docket No. 50-374 Gentlement The emelooed 20 Bulletin requests action by you with regard to your power reactor f=414tias with operating license or construction permit.
Should you have questions regarding this Bulletin or actions requested of you, please contact this office.
Sincerely yours, James G. Esppler Regi = 1 Director Emeleeurst 30 Bulletin No. 74-15
" Approved by GAO, 3-180225 (2007't), clearance espires 7-31-77.
Approval was given under a blanket clearance specifiutlly for idmarified generic problems."
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Local PDR GGC, Beth, P-506AZ GC (2)
Anthony Roissan, Esq.
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DecGmber 6, 1974 RO Bulletin No. 74-15 MISAPPLICATION OF CUTLER-HAMMER 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 an automatic start signal. One of the diesels failed to start even 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 inst.tlled on each of the two General Motors diesel generators supplied to the Kevaunee 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 safety-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 described above. 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 of your power reactor facilities notify this office of this finaing within 30 days.
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