ML17053B065
| ML17053B065 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 09/24/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Schneider R NIAGARA MOHAWK POWER CORP. |
| References | |
| NUDOCS 7910090595 | |
| Download: ML17053B065 (8) | |
Text
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Docket No.,50-220 O
UNITED STATES NUCLEAR REGULATORY COMMISSION REGION I 631 PARK AVENUE KING OF PRUSSIA, PENNSYLVANIA19406 SEP 24 1979 Niagara Mohawk Power Corporation ATTN:
Mr.
R.
R. Schneider Vice President Electric Operations 300 Erie Boulevard West
- Syracuse, New York 13202 Gentlemen:
The enclosed 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, Director
Enclosures:
l.
IE Circular No. 79-20 2.
List of IE Circulars Issued in the Last Six Months cc w/encls:
T.
E.
- Lempges, General Superintendent, Nuclear Generation T. J.
- Perkins, Station Superintendent C.
L. Stuart, Operations Supervisor E.
B. Thomas, Jr.,
Esquire A. Z.
- Roisman, Natural Resources Defense Council
.ENCLOSURE 1 e
Accession No.: 7908220118 SSINS No.:
6830 UNITED STATES
~
'UCLEAR REGULATORY, COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.
C.
20555
/
IE Circular No. 79-20 Date:
September 24, 1979 Pa'ge 1 of 1 FAILURE OF GTE SYLVANIA RELAY, TYPE PM BULLETIN 7305, CATALOG 5U12"ll-AC MITH 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 81, 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', 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'he relays had detectable notches ranging from 0.001 to 0.003 inches deep.
Recommended Actions for.Licensees'onsideration:
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 control's 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.
ENCLOSURE '2 e
C IE Circular No. 79-20 Date:
September 24, 1979 Page 1 of.2 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Circular No.
79"06 79-07 79-08 79-09 79"10 79-11 79-12 79-13 79-14 Subject Failure to Use Syringe and Bottle Shields in Nuclear Medicine Unexpected Speed Increase of Reactor Recirculation MG Set Resulted in Reactor Power Increase Attempted Extortion-Low Enriched Uranium Occurrences of Split or Punctured Regulator Diaphragms in Certain Self-.Contained Breathing Apparatus Pipefittings Manu-factured from Unacceptable Material Design/Construction Interface Problem Potential Diesel Generator Turbo-charger Problem Replacement of Diesel Fire Pump Starting Contactors Unauthorized Procure-ment and Distribution of Xenon-133 First Date of Issue 4/19/79 5/2/79 5/18/79 6/22/79 6/26/?9 6/27/79 6/28/79 7/16/79 7/16/79 Issued To All Holders of Medical Licenses Except Teletherapy Licenses All BMR Power Reactor Facilities with an OL or CP All Fuel Facilities and Licensed Reactors All Materials Priority I, Fuel Cyc'le and Operating Reactor Licensees All Power Reactor Facilities with an OL or CP All.Applic'ants for, and Holders of CPs All Power Reactor Facilities with an OL or CP All Power Reactor Facilities with an OL or CP All Medical Licensees except Teletherapy Medi-cal Licensees, and all Licensed Radiopharma-ceutical Suppliers
Enclo'sure 2
0 e
IE Circular No. 79-20 Date:
September 24, 1979 Page 2 of 2 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Circular No.
Subject First Date Issued To of Issue 79-15 79-16 79"17 79-18 79-19 Bursting of High Pres-sure Hose and Malfunc-tion of. Relief Valve "0" Ring in Certain Self-Contained Breathing Apparatus Excessive Radiation Exposures to Members Of The General Public And A Radiographer Contact Problem in SB-12 Switches on General Electric Metalclad Circuit Breakers Proper Installation of Target Rock Safety-Relief Valves Loose Locking Devices on Ingersoll-Rand Pumps 8/8/79 8/16/79 8/14/79 9/10/79 9/13/79 All Materials Priority I, Fuel Cycle and Opera-ting Power Reactor
'icensees All Radiography Licensees All Power Reactor Licensees with an OL or CP All Power Reactor Licensees with an OL of CP All Power Reactor Licensees with an OL or CP
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