ML19209B045
| ML19209B045 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 09/24/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7910090037 | |
| Download: ML19209B045 (1) | |
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GLEN ELLYN. lLLINOIS 60137 SLP }, s u Docket No. 50-358 Cincinnati Gas and Electric Company ATTN:
Mr. Earl A. Borgmann Vice President Engineering Services and Electric Production 139 East 4th Street Cincinnati, OH 45201 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, bW James G. Kepp er Director
Enclosure:
IE Circular No. 79-20 cc w/ encl:
Mr. J. R. Schott, Plant Superintendent Centril Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC T!C Harold W. Kohn, Power Siting Commission Citizens Against a Radioactive Environment Helen W. Evans, State of Ohio i
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Accession No.: 7908220118 SSINS No.: 6830 UNITED STATES NUCLEAR REGULATORY COMMISSION h
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iJlJlllfM Vf fQdg 0FFICE OF INSPECTION AND ENFORCEMENT Ud WASHINGTON, D. C.
20555 September 24, 1979 IE Circular No. 79-20 FAILURE OF GTE SYLVANIA RELAY, TYPE PM BULLETIN 7305, CATALOG 5U12-11-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 62X2B/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 occurs 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.
Recomended Actions for Licensees' Consideration:
1.
Ensure that all GTE Sylvania Relays Type PH Bulletin 7305, with a 120V AC Coil used in or affecting the operation of safety-related equipment are examined to ensure that the armatuie operating rod is not 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 ar5ure demonstrated operation until the relay condition is corrected.
No written respense to this Circular is required.
If you require additional information regarding this subject, contact the Director of the appropriate NRC Regional Office.
Enclosure:
List of IE Circulars
- Issued in the Last 6 Months (i
1114 308
IE Circular No. 79-20
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Enclosure September 24, 1979 UU Uit Ua HjiL Page 1 of 2 LISTING OF IE CIRCULARS ISSUED IN LAST SIX HONTHS Circular Subject Date of Issued to po.
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 All 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 01.'s or CP's HG Set Resulted in Reactor Power Increase 79-08 Attempted Extortion Low S/18/79 All Fuel Facilities Enriched Uranium Licensed by NRC 79-09 Occurrences of Split or 6/22/79 All Materials Punctured Regu'iator Siaphragms Priority I, Fuel In Certain Self Centained Cycle and Operating Breathing Apparatus Reactor Licensees 6/26/79 All Power Reac 'r 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 1114 309
IE Circular No. 79-20 Enclosure September 24, 1979 Page 2 of 2 LISTING OF IE CIRCULARS ISSUED IN LAST SIX HONTHS Circular Subject Date of Issued to ho.
Issued
$9-12 Potential Diesel Generator 6/28/79 All Power Reactors Turbocharger Problem Operating Facilities and all Utilities hav*ng 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 Distribution of XE-133 except Teletheraphy Medical Licensees and to all Radiopharmaceu-tical Suppliers 79-15 Bursting of High Pressure Hose 8/c/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 Members 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 Deactor Ingersoll-Rand Pumps Operating facilities and all utilities having a CP 1114 310