ML19208D329
| ML19208D329 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 09/24/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Mary Johnson SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7909280240 | |
| Download: ML19208D329 (2) | |
Text
/
UNITED STATES o,,
8 NUCLEAR REGULATORY COMMISSION o
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,e REGION 11 o,%
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101 MARIETTA ST., N.W., SUITE 3100 o
ATLANTA, GEORGIA 30303 SEP 2 41979 In Reply Refer To:
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South Carolina Electric and Gas Company Attn:
M. C. Johnson, Vice President Special Services and Purchasing Post Office Box 764 Columbia, South Carolina 29218 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, 3
James P. O'Reilly Director
Enclosures:
1.
IE Circular No. 79-20 2.
List of IE Circulars Issued in the Last six months f
m em i
1044 174 2yo 7909280 4'
SEP 2 41979 South Carolina Electric arl Gas Company '
cc w/ encl:
T. B. Conners, Jr.
Conners, Moore and Corber 1747 Pennsylvania Avenue, N.W.
Washington, D.C.
20006 A. A. Smith Quality Assurance Post Office Box 8 Jenkinsville, South Carolina 29065
- 0. S. Bradham, Manager Nuclear Operations Post Office Box 8 Jenkinsville, South Carolina 29065 1044 175 O
Accession No.: 7908220118 SSINS No.: 6830 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 September
'4, 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 Systea at Metropolitan Edison Three Mile Island Nuclear Station Unit #1, relay 627.2B/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 coincidence 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 armature operating rod. The notch curs where the rod vibrates against the magnet assembly due to coil hum. 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 inspection of forty-eight (48) relays by this licensee indicated that twenty-five (25) of the relays had detectable 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 not netched 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 requiredl If you require additional information regarding this subject, contact the Director of the appropriate NRC Regional Office.
1044 176
IE Circular No. 79-20 Enclosure September 24, 1979 Page 1 of 2 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Circular Subject Date of Issued to No.
Issued 79-20 Failure of GTE Sylvania 9/24/79 All Power Reactor Relay, Type PM Bulletin 7305, Operating facilities Catalog SU12-11-AC With A and all utilities 120V AC Coil having a CP 79-19 Loose Locking Devices 9/13/79 All Power Reactor on Ingersoll-Rand Pumps Operating facilities and all utilities having a CP 79-18 Proper Installation of 9/10/79 All Power Reactor Target Rock Safety-Relief Licensees with a CP Valves and/or OL 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 79-16 Excessive Radiation Exposures 8/16/79 All Radiography To Members Of The General Public Licensees And A Radiographer 79-15 Bursting of High Pressure Hose 8/22/79 Research Reactors (Correc-and Malfunction of Relief tion)
Valve "0" Ring in Certain Self-Contained Breathing Apparatus 79-15 Barsting 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 79-14 Unauthorized Procurement and 7/13/79 All Medical Licensees Distribution of XE-133 except Teletheraphy.
Medical Licensees and to all Radiopharmaceu-tical Suppliers 1044 177
IE Circular No. 79-20 Enclosure September 24, 1979 Page 2 of 2 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Circular Subject Date of Issued to No.
Issue 79-13 Replacement of Diesel 7/13/79 All Power Reactor Fire Pump Starting Operating Facilities Contactors and all Utilities having a CP 79-12 Potential Disel Generator 6/28/79 All Power Reactors Turbocharger Problem Operating Facilities and all Utilities having a CP 79-11 Design / Construction 6/27/79 All Applicants Interface Problem for, and Holders of Power Reactor cps 79-10 Pipefittings Manufactured 6/26/79 All Power Reactor from Unacceptable Material Licensees with a CP and/or OL 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 79-08 Attempted Extortion - Low 5/18/79 All Fuel Facilities Enriched Uranium Licensed by NRC 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 79-06 Failure to Use Syringe 4/19/79 All Holders of and Bottle Shields in Medical Licensees Nuclear Medicine except teletherapy licensees 1044 178
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