ML19209B890
| ML19209B890 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Byron, Braidwood, Quad Cities, Zion, LaSalle  |
| Issue date: | 09/24/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Byron L COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 7910110111 | |
| Download: ML19209B890 (1) | |
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UNITED STATES 8 g NUCLEAR REGULATORY COMMISSION g
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799 ROOSEVELT ROAD
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GLEN E LLYN. lLLINOIS 60137 I
Docket Nos. 50-10, 50-237, 50-249, 50-254, 50-265, 50-295, 50-304, 50-373, 50-374, 50-454, 50-455, 50-456 and 50-457 Commonwealth Edison Company ATTN:
Mr. Byron Lee, Jr.
Vice President Post Office Box 767 Chicago, IL 60690 Gentlemen:
The enclosed IE Circular No. 79-20, is forwarded to you for information.
No written response is required. Should you have any questions related to your understanding of this matter, please contact this office.
Sincerely, MdM
(/ James G. Keppler Director
Enclosure:
IE Circular No. 79-20 cc w/ enc 1:
Mr. B. B. Stephenson, Mr. R. Cosaro, Project Station Superintendent Superintendent Mr. N. Kalivianakis, Central Files Station Superintendent Director, NRR/DPM Mr. N. Vandke, Station Director, hM/ DOR Superintendent PDR Mr. L. J. Burke, Site Local PDR Project Superintendent NSIC Mr. T. E. Quaka, Quality TIC
/.ssurance Supervisor Anthony Roisman, Esq.,
Mr. R. H. Holyoak, Station Attorney Superintendent Mr. Dean Hansell, Office Mr. Gunner Sorensen, Site of Assistant Attorney Project Superintendent General lO 326 7910110 // /
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Accession No.: 7908220118 SSINS No.: 6830 UNITED STATE!
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NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT Je
_a Jl/B VASHINGTON, D. C.
20555 September 24, 1979 IE Circular No. 79-20 FAILURE OF GTE SYLVANIA RELAY, TYPE PM BULLETIN 7305, CATALOG SU12-11-AC WITH A 120V AC COIL Description of Circumstances:
During inspection of relays'in the Engineered Safeguards Actuation System at Metropolitan Edison Three Mile Island Nuclear Station Unit #1, relay 62X28/RCIA failed to drop out when the coil was deenergized. The failed relay would not prevent component starting but would have reduced the 2 of 3 coincider.ce logic to 2 of 2, affecting Decay Heat Closed Cooling Pump A and Nuclear Services Closed Cooling Pump A or B.
The cause for failure was attributed to a notch in the armeture operating rod. The notch occurs where the rod vibrates against the nagret assembly due to coil hura. A review of the history of this component indicates that similar relays failed during 1977 through 1979 at least one of which was attributed to notching. An inspecticn of forty-eight (48) relays by this licensee indicated that twenty-five (25) of the relays had cetectable notches ranging from 0.001 to 0.003 inches deep.
Recommended Actions for Licensees' Consideration:
1.
Ensure that all GTE Sylvania Relays Type PM Bulletin 7305, with a 120V AC Coil used in or affecting the operation of safety-related equipment are examined to ensure that the armature operating rod is ncit notched and is operating freely.
2.
Relays found with detectable notches on the operating rod should be corrected.
If correction cannot be accomplished then administrative controls should be initiated to assure demonstrated operation until the relay condition is corrected.
No written response to this Circular is required.
If you require additional information regarding this subjec.t, contact the Director of the appropriate NRC Regional Office.
Enclosure:
List of IE Circulars
. Issued in the Last 6 Months l
t l'
0 327
IE Circular No. 79-20 Enclosure September 24, 1979 Page 1 of 2 r
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LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS
'aJ Circular Subject Date of Issued to 50.
Issue 03 Inadequate Guard Training-2/23/79 All Holders of Qualification and Falsified and applicants Training Records for Special Nuclear Material Licenses in Safeguards Group I 79-04 Loose Locking Nut On 3/16/79 All Holders of Limitorque Valve Reactor OLs or cps Operators 79-05 Moisture Leakage In 3/20/79 All Holders of Stranded Wire Conductors Reactor OLs or cps 79-06 Failure to Use Syringe 4/19/79 f.11 Holders of and Bottle Shields in Medical Licensees Nuclear Medicine except teletherapy licensees 79-07 Unexpected Speed Increase 5/2/79 All Holders of of Reactor Recirculation BWR OL's or CP's MG Set Resulted in Reactor Power Increase 79-08 Attempted Extortion - Low 5/18/79 All Fuel Facilities Enriched Uranium Licensed by NRC 79-09 Occurrences of Split or 6/22/79 All Materials Punctured Regulator Diaphragms Priority I, Fuel In Certain Self Contained Cycle and Operating Breathing Apparatus Reactor Licensees 6/26/79 All Power Reactor 79-10 Pipefittings Manufactured from Unacceptable Material Licensees with a CP and/or OL 79-11
' Design / Construction 6/27/79 All Applicants Interface Problem for, and Holders of Power Reactor cps 1O 328
IE Circular No. 79-20 Enclosure September 24, 1979 Page 2 of 2 LISTING OF IE CIRCULARS ISSUED IN LAST SlX MONTHS
,c2 Circular Subject Date of Issued to ho.
Issued 59-12 Potential Diesel Generator 6/28/79 All Power Reactors Turbocharger Problem Operating Facilities and all Utilities having a CP 79-13 Replacement of Diesel 7/10/79 All Power Reactor Fire Pump Starting Operating Facilities Contactors and all Utilities having a CP 79-14 Unauthorized Procurement and 7/13/79 All Medical Licensees Oistribution of XE-133 except Teletheraphy Medical Licensees and to all Radiopharmaceu-tical Suppliers 79-15 Bursting of High Pressure Hose 8/8/79 All Materials Priority I, and Malfunction of Relief Fuel Cycle and Operating Valve "0" Ring in Certain Self-Power Reactor Licensees Contained Breathing Apparatus 79-16 Excessive Radiation Exposures 8/16/79 All Radiography To Hembers Of The General Public Licensees And A Radiographer 79-17 Contact Problem in SB-12 8/14/79 All Power Reactor Switches on General Electric Licensees with a CP Company Metalclad Circuit and/or OL Breakers 79-18 Proper Installation of 9/10/79 All Holders of a Target Rock Safety-Relief Power Reactor OL Valves or CP 79-19 Loose Locking Devices on 9/13/79 All Power Reactor Ingersoll-Rand Pumps Operating facilities and all utilities having a CP 1'
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