ML19329E397
| ML19329E397 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 06/08/1978 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 8006120718 | |
| Download: ML19329E397 (1) | |
Text
._,
y
,t f, fj'{$
JUN 0 81978 l
Docket No Docket No.
Consumers Power Company AITN Mr. Stephen H. Howell Vice President 1945 West Parnall Road Jackson, HI 49201 l
Centlemen:
The enclosed IE Circular No. 78-09, is forwarded to you for infor-nation. No written response is required. Shoald you have any quest l.ons 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:
A ntral Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Ronald Callen, Michigan Public Service Commission Dr. Wayne E. North Myron M. Cherry, Chicago
[M orFiCe >
_RIII RIII suRnauc h Heishma
_dal_____
ler oave >
6-1-78 6-7-78 NRC Poem 315A (R3IE) (5-76) NRCM 02040
- U. S. GOVERNMENT PRINTING OFFICE.
1978-2S3-818 80061209/,8 g
3
)
U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III June 8, 1978 II Circular No. 78-09 ARCING OF GENEPJd. ELECTRIC COMPANY SIZF. 2 CONIACTORS During routine preventive maintenance 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. CR206D000EEE) were found to have been burned. Binding in the movable part of the contactor prevented a c.ood electrical contact with the stationary contacts resulting in are-burn damage. GE indicated the cause to be oversized copper tip support binding in the phenolic tip 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 NEMA 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 auare 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 =ay want to also review your spare parcs inventories for the plant to assure that similar contactors are not being held for use in safety related systa=s. Tour review ci this matter should consider whether corrective or preventive actions need to be i=ple=ented at your facility to alleviate the contact problems as discussed.
No written response to this Circular is required. If you require additional infor:ation regarding this matter, contact the Director of the NRC Regional Office.
clot (f"' "dD E3 Oi Ob q I CH e
- 7 3
m, IE Circular No. 78-09 June 8, 1978 LISIING OF IE CIRCULAR ISSUED IN 1978
]
Circular Subj ect Date Issued To No.
cf Issue 78-01 Loss of Well Logging 4/5/78 All Holders of j
Source Well Logging Source Licenses I
78-02 Proper Lubricating 011 4/20/78 All Holders of for Terry Turbines Reactor Operating Licenses (OL) or Construction Permit (CP) l 78-03 Packaging Greater Than 3/12/78 All Holders of Type A Quantities of Reactor Operating Fev Specific Activity Licenses (OL),
Radioactive Material Construction for Transport Per=its (CP), Tual Cycle, Priority I Material and Waste Disposal Licenses 78-04 Installation Error That 5/15/78 All Holders of an Could Prevent Closing of NRC Operating Fire Doors License (OL) or Construction Permit (CP) 78-05 Inadvertent Safety 5/23/78 A11 Eolders of a Injection During Reactor Operating Cooldown License (OL) or a Construction Permit (CP) 78-06 Potential Co==cn Mode 5/23/78 All Holders of Flooding of ECCS Equipment Reactor OLs or Rooms at B'nR Facilities cps 78-07 Danaged Components of a 5/31/78 All Holders of Bergen-Paterson Series of Reactor OLs 25000 Hydraulic Test Stand or cps l
Enclosure Page 1 of 2
~
, r-e a
1 n
IE Circular No. 78-09 June 8, 1978 Circular Subject Data Issued To 30-of Issue 78-08 Environmental Qualification 5/31/78 All Holders of I
of Safety Related Equipment Reactor OLs at Nuclear Power Plants or cps i
Enclosure Page 2 of 2
~
-m
_ _.. _ - - = _