ML19209C200
| ML19209C200 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/24/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 7910120193 | |
| Download: ML19209C200 (1) | |
Text
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CENTRAL FILES PDR:HQ UNITED STATES L R
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NUCLEAR REGULATORY COMMISSION REGloN IV
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September 24, 1979 Docket Nos.
50-313 50-368
/ekansas Power and Light Company ATTN:
Mr. William Cavanaugh III Vice President of Generation and Construction P. O. Box 551 Little Rock, Arkansas 72203 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 naderstanding of this matter, please contact this office.
Sincerely, js.h- /, ' 's
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I, Karl V. Seyfrit
-Q Director
Enclosures:
1.
IE Circular No. 79-20 2.
List of IE Circulars Issued in the Last 6 Months cc:
James P. O'Hanlon, Plant Manager Arkansas Nuclear One P. O. Box 608 Russellville, Arkansas 72801 1
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Accession No.: 7908220118 SSINS No.: 6830 UNITED STATES NUCLEAR PIGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 IE Circular No. 79-20 Date:
September 24, 1979 Page 1 of 1 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 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 vibraces 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 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 subject, contact the Firector 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 Subj ect 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 79-07 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 79-03 Attempted Extortion - Low 5/18/79 All Fuel Facilities and Enriched Uranium Reactors Licensed by NRC 79-09 Occurrences of Split or 6/22/79 All Materials Priority I, Punctured Regulator Fuel Cycle and Operating Diaphragms in Certain Reactor Licenses (0L)
Self Contained Breathing Apparatus 79-10 Pipefittings Manufactured 6/26/79 All Power Reactor Licensees from Unacceptable Material with a Construction Permit and/or Operating License (OL) 79-11 Design / Construction 6/27/79 All Holders of and Applicants Interface Problem 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 Powcr Reactor Licensee Fire Pump Starting with a Construction Permit Contactors (CP) and/or Operating Licensee (OL)
Enclosure Page 1 of 2
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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 High Pressure 8/8/79 All Materials Priority I, Hose and Malfunction of Fuel 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 Company Construction Permit Metalclad Circuit (CP) and/or Operating Breakers License (OL) 79-18 Proper Installation of 9/10/79 All Holders 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 (OL)
Enclosure Page 2 of 2 O
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