ML19338F278
| ML19338F278 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Byron, Braidwood, Quad Cities, Zion, LaSalle  |
| Issue date: | 06/08/1978 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Brian Lee COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8010140677 | |
| Download: ML19338F278 (1) | |
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C;OTatL FILES JUN 0 81978 Docket Nos. 50-456, 50-457, 50-454, 50-455, 6 50-237, 50-249, 50-373, 50-374, 50-254, 50-265, 50-295 and 50-304 Commonwealth Edison Company ATTN: Mr. Byron Lee, Jr.
Vice President Post Office Box 767 Chicago, IL 60690 Gentlemen:
The enclosed IE Circular No. 78-09, is forwarded to you for infor-nation. H3 written response is required. Should you have any questions related to your understanding of this matter, please contact this office.
Sincerely, James C. Keppler Director
Enclosures:
1.
IE Circular No. 78-09 2.
List of IE Circulars Issued in 1978 cc w/encia:
Mr. B. B. Stephenson, Mr. R. Cosaro, Project Station Superintendent Superintendent Mr. N. Kalivianakis, W entral Files Station Superintendent Director,IMR/DPM Mr. N. Wandke, Station Director, NRR/ DOR Superintendent PDR Mr. L. J. Burke, Site Local PDR Project Superintendent NSIC Mr. Gunner Sorensen, Site TIC
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Project Superintendent Anthony Roisman, Esq., Attorney
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NRC Form 318A (R2ZI) (5-76) NRCM O2040
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U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III June,8, 1978 IE Circular No. 78-09 ARCING OF GENERAL ELECTRIC COMPANY SIZE 2 COhTACTORS During routine preventive caintenance of a nonsafety related motor starter at Millstone Unit No. 2, the movable contacts in a General Electric Co=pany (GE) NEMA Size 2 contactor (Part No. CR206D000EEH) were found to have been burned. Einding in the movable part of the contactor preventei a good electrical contact with the stationary contacts resulting in arc-burn damage. GE indicated the cause to be oversized copper tip support binding in the phenolic rip carrier.
GE reportedly modified their tooling to correct for the manufacturing problem and inspected the contactor spare part kits in their ware-house for oversized tip supports.
The Northeast Nuclear Energy Co=pany subsequently inspected the remaining GE 1330L Size 2 contactors installed at this facility and' replaced over-sized tip supports in three safety related and five other contactors.
All holders of an operating license or a construction permit should be aware that the above described GE contactor may be installed in safety related systems at their facilities and give consideration to assuring that these contactors do not have oversized tip supports which could cause poor electrical contact.. You may want to also review your spare parts inventories for the plant to assure that similar contactors are not being held for use in safety related systems. Tour review of this catter should consider whether corrective or preventive actions need to be icplemented at your facility to alleviate the contact problems as discussed.
No written response te this Cirt alar is required. If you require additional information regarding this matter, contact the Director of the NRC Regional Office.
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et IE Circular No. 78-09 June 8, 1978 LISTING OF IE CIRCULAR ISSUED IN 1978 Date Issued To Circular Subj ect of Issue No.
78-01 Loss of Well Logging 4/5/78 All Holders of Well Logging Source Source Licenses 78-02 Proper Lubricating 011 4/20/78 All Holders of Reactor Operating for Terry Turbines Licenses (OL) or Construction Permit (CP) 78-03 Packaging Greater Than 5/12/78 All Holders of Type A Quantities of Reactor Operating Licenses (OL),
Tew Specific Activity Radioactive Material Construction Permits (CP), Tuel for Transport Cycle, Priority 2 Material and Waste Disposal Licenses 78-04 Installation Irror That 5/15/78 All Holders of an Could Prevent Closing of NRC Operating License (OL) or Fire Doors Construction Permit (CP) 78-05 Inadvertent Safety 5/23/78 All Holders of a Reactor Operating Injection During License (OL), or Cooldown a Construction Permit (CP) 78-06 Potential Co=:non Mode 5/23/78 All Eolders of Flooding of ECCS Equipment Reactor OLs or Rooms at BWR Tacilities cps 78-07 Danaged Cocponents of a 5/31/78 All Holders of of Reactor OLs Bergen-Paterson Series 25000 Hydraulic Test Stand or cps Enclosure Page 1 of 2
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IE Circular No. 78-09 Jane 8, 1978 Circular Subject Data Issued To No.
of Issue 78-08 Environmental Qualification 5/31/78 All Holders of of Safety Related Equipment Reactor OLs at Nuclear Power Plants or cps Su
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Enclosure Page 2 of 2 "T ' ' '
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