ML19312C393
| ML19312C393 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 01/16/1978 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Parker W DUKE POWER CO. |
| Shared Package | |
| ML19312C394 | List: |
| References | |
| NUDOCS 7912130919 | |
| Download: ML19312C393 (2) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION MI
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R EGloN il ng 230 PEACHTREE STREET, N.W.SulTE 818 2
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ATLANTA, GEORGIA 30303 o
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g7 JA!i 161978 in Reply Refer To:
RII:JP0 50-369, 50-370 50-269, 50-270 50-287 Duke Power Company Attn:
Mr. William C. Parker, Jr.
Vice President, Steam Production P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 Gentlemen:
Enclosed is lE Bulletin No. 78-01 which requires action by you with regard to your power reactor facility (ies) having an operating license or a con truction permit.
Should
>u have any questions regarding this Bulletin or the actions required, please contact this office.
Sincerely,
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James P. O Rei ly Director
Enclosures:
1.
IE Bulletin No. 78-01 w/ attachment 2.
List of LE Bulletins Issued during'last 12 months cc w/ encl:
J. C. Rogers, Project Manager McGuire Nuclear Station P. O. Box 2178 Charlotte, North Carolina 28242 0
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IE Bulletin 78-01 cc w/ encl:
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M. D. McIntosh, Plant Manager McGuire Nuclear Station P. O. Box 488 t_
Cornelius, North Carolina 28031 l
J. E. Smith, Station Manager j
Oconee Nuclear Station P. O. Box 1175 Seneca, South Carolina 29678 i
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l UNITED STATES NUCLEAR REGULATORY CO.T.ISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 January 16, 1978 IE Bul3etin No. 78-01 FLAMMABLE CONTACT-ARM RETAINERS IN G.E. CR120A RELAYS Description of Circumstances:
ON April 18, 1977, a fire was discovered in a relay cabinet in the Peach Bottoc Unit 3 facility. The fire da= aged eight relays, type CR120A, canufactured by the General Electric Co=pany.
The fire was investigated by the licensee, the Philadelphia Electric Company, whc concluded that it was caused by an overheated relsf coil that ignited the relay's plastic contact-arm retainer.
Subsequently, on July 29, 1977, fire damage was discovered in a relay cabinet during surveil-lance testing in the Peach Bottom Unit 2 facility. This fire damaged 18 G.E. type CR120A relays.
Discussion:
The investigatiokn revealed that the relay's contact-ARM retainers was made from Celcon M90 Acetal Copoly=er which is a fla==able caterial.
In June 1972, this caterial was changed to valox 310-SED, which is self extinguishing and flame resistant. Both materials are white and have the same surface appearance. A G.E. Service Information Letter SIL-NO-229 (a copy of the text is attached for information) indicates that there is no generic overheating problem with this type relay.
However, they recom=end that BWR owners replace the contact-arm retainer of all relays (including BOP applications) marked witn manufacturers date code between E.D. (May 1968) and A.J. (January 1973) with the improved, self extinguishing flame resistant contact arm retainers.
Action To Be Taken By Licensees And Permit Holders:
Licensees Of Power Reactor Facilities With An Operating License And Construction Permit Holders Shall Take The Following Actions:
1.
Determine if you have installed G.E. type CR120A relays in s
es have the p
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etermine if DUPLICATE DOCUMENT rder.
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