ML19209C202
| ML19209C202 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 09/24/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 7910120196 | |
| Download: ML19209C202 (1) | |
Text
CENTR'.L FILES PDR: liq UNITED STATES
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NUCLEAR REGUL ATORY COMMISSION HEClONIV NSIC e,.
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c September 24, 1979 Docket No.
50-298 Nebraska Public Power District ATTN:
J. M. Pilant, Director Licensing & Quality Assurance Post Office Box 499 Columbus, Nebraska 68601 Centlemen:
The enclosed IE Circular No. 79-20 is foruarded to you for infor ation.
No written response is required.
Should you have any questions related to your understanding of this matter, please contact this office.
Sincerely,
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Karl V.' pyfrit
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Enclosures:
1.
IE Circular No. 79-20 2.
List of IE Circulars Issue in the Last 6 Months cc:
L. C. Lessor, Superintendent Cooper Nuclear Station Post Office Box 98 Brownville, Nebraska 68321 O
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Accession No.: 7908220118 SSINS Nc.: 6830 UNITED STATES NUCLEAR REGULATORY CC;1 MISSION D
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n-b h-0FFICE OF INSPECTION ANL ENFORCEMENT uo m- ~ frt u L 2 WASHINGTON, D. C.
20555 IE Circular No. 79-20 Date: September 24, 1979 Page 1 of 1 FAILURE OF GTE SYLVANIA RELAY, TYF2 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 62X2B/RCIA failed to drop out when the coil was de-energized. 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.
Recommended Actions for Licensees' Consideration:
1.
Enst re 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 notched and is operating freely.
2.
Relays found with detectable notches en 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 rcquired.
If you require additional information regarding this subject, contact the Director of the appropriate NRC Regional Office.
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IE Circular No. 79-20 September 24, 1979 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Circular Subject Date of Issued To No.
Issue 79-06 Failure to Use Syringe 4/19/79 All Holders of Medical and Battle Shields in Licensees except Teletherapy Nuclear Medicine Licensees 53-07 Unexpected Speed Increase 5/2/79 All Holders of BWR Operating of Reactor Recirculation Licenses (OLs) or Construc-MG Set Resulted in Reactor tion Permits (cps)
Power Increase 79-08 Attempted Extortion - Low 5/18/79 All Fuel Facilities and Enriched Urcnium Reactors Licensed by NRC 79-09 Occurrences of Sptit or 6/22/79 All Materials Priority 1, Punctured Regulator Fuel Cycle and Operating Diaphrtgns in Certain Reactor Licenses (OL)
Self Cantained Breathing Apparatus 79-10 Pipefittings Manufactured 6/26/79 All Power Reactor Licensees from Un ereptable Material with a Construction Permit and/or Operating Lice",se (OL) 79-11 Design / Construction 6 27/79 All Holders of and Applicants
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Interface Probl m for Power Reactor Construction Permits (CP) 79-12 Potential Diesel Generator 6/28/79 All Power Reactor Licensee with Turbocharger Problem a Construction Permit (CP) and/or Operating License (OL) 79-13 Replacement of Diesel 7/13/79 All Power Reactor Licensee Fire Pump Starting with a Construction Permit Contactors (CP) and/or Operating Licensee (OL) l Enc osure Page 1 of 2 A
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IE Circular No. 79-20 September 24, 1979 79-14 Unauthorized Procurement 7/13/79 All Medical Licensees and Distribution of Except Teletheraphy XE-133 Medical Licensees and to all Radiopharmaceutical Suppliers 79-15 Bursting of Iligh Pressure 8/8/79 All Materials Priority I, llose and Malfunction of luel Cycle and Operating Relief Valve "0" Ring in Power Reactor Licensees Certain Self-contained Breathing Apparatus 79-16 Excessive Radiation 8/16/79 All Radiography Exposures to Members Licensees of the General Public and a Radiographer 79-17 Contact Problem in SB-12 8/14/79 All Power Reactor Switches on General Licensees with a Electric Comnany Construction Permit Metalclad Circuit (CP) and/or Operating Breakers License (OL) 79-18 Proper Installation of 9/10/79 All Ifolders of a Target Rock Safety-Relief Power Reactor Operating Valves License (0L) or Construction Permit (CP) 79-19 Loose Locking Devices 9/13/79 All Power Reactor Ingersoll-Rand Pumps Licensees with a Construction Permit (CP) and/or Operating Licensee (0L)
Enclosure Page 2 of 2 1
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