ML18135A154
| ML18135A154 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 09/24/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7909280233 | |
| Download: ML18135A154 (5) | |
Text
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e UNITED STATES NUCLEAR REGULATORY COMMISSION REGION II In Reply Refer To:
RII:JPO 50-338, ~-0-339 50-404, ;~405
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101 MARIETIA ST., N.W., SUITE 3100 ATLANTA, GEORGIA 30303 SEP 2 4 1979 Virginia Electric and Power Company Attn:
W. L. Proffitt Senior Vice President, Power P.O. Box 26666 Richmond, Virginia 23261 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.
Enclosures:
- 1.
IE Circular No. 79-20
- 2.
List of IE Circulars Issued in the Last six months Sincerely, James P.
Director
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Virginia Electric and Power Company cc w/encl:
W.R. Cartwright, Station Manager Post Office Box 402 Mineral,_ Virginia 23117 P. G. Perry Senior Resident Engineer Post Office Box 38 Mineral, Virginia 23117 W. L. Stewart, Manager Post Office Box 315 Surry, Virginia 23883 /,/
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SEP 2 4 1979
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e UNITED STATES Accession No.: 7908220118 SSINS No. : 6830 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT 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/RC1A 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.
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 Director of the appropriate NRC Regional Office.
e IE Circular No. 79-20 September 24, 1979 Circular No.
79-20 79-19 79-18 79-17 79-16 79-15 (Correc-tion) 79-15 79-14 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Subject Date of Issued Failure of GTE Sylvania 9/24/79 Relay, Type PM Bulletin 7305, Catalog SU12-11-AC With A 120V AC Coil Loose Locking Devices 9/13/79 on Ingersoll~Rand Pumps Proper Installation of 9/10/79 Target Rock Safety-Relief Valves Contact Problem in SB-12 8/14/79 Switches on General Electric Company Metalclad Circuit Breakers Excessive Radiation Exposures 8/16/79 To Members Of The General Public And A Radiographer Bursting of High Pressure Hose 8/22/79 and Malfunction of Relief Valve "O" Ring in Certain Self-Contained Breathing Apparatus Bursting of High Pressure Hose 8/8/79 and Malfunction of Relief Valve "O" Ring in Certain Self-Contained Breathing Apparatus Unauthorized Procurement and 7 /13/79 Distribution of XE-133
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Enclosure..
Page 1 of 2 Issued to All Power Reactor Operating facilities and all utilities having a CP.
All Power Reactor Operating facilities and all utilities having a CP All Power Reactor Licensees with a CP and/or OL All Power Reactor Licensees with a CP and/or OL All Radiography Licensees All Research Reactors All Materials Priority i, Fuei Cycle and Operating Power Reactor Licensees All Medical Licensees except Teletheraphy*
Medical Licensees and to all Radiophar.maceu-tical Suppliers
IE Circular No. 79-20 September 24, 1979
- e Enclosure Page 2 of 2 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Circular No.
79-13 79-12 79-11 79-10 79-09 79-08 79-07 79-06 Subject Date of Issue Replacement of Diesel 7/13/79 Fire Pump Starting Contactors Potential Disel Generator 6/28/79 Turbocharger Problem Design/Construction 6/27/79 Interface Problem Pipefittings Manufactured 6/26/79 from Unacceptable Material Occurrences of Split or
- 6/22/79 Punctured Regulator.Diaphragms In Certain Self Contained Breathing Apparatus Attempted Extortion - Low 5/18/79 Enriched Uranium Unexpected Speed Increase 5/2/79 of Reactor Recirculation MG Set Resulted in Reactor Power Increase Failure to Use Syringe and Bottle Shields in Nuclear Medicine 4/19/79
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Issued t~o All Power Reactor Operating Facilities and all Utilities having
- a -CP All Power Reactors Operating Facilities and all Utilities having a CP All Applicants for, and Holders of Power Reactor CPs All.Power Reactor Licensees with a CP and/or OL All Materials Priority I, Fuel Cycle and Operating Reactor Licensees All Fuel Facilities Licensed by NRC All Holders of BWR OL's or CP's All Holders of Medical Licensees except teletherapy licensees