ML17244A802
| ML17244A802 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 08/14/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | White L ROCHESTER GAS & ELECTRIC CORP. |
| References | |
| NUDOCS 7909070149 | |
| Download: ML17244A802 (8) | |
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1 UNITED STATES NUCLEAR REGULATORY COMMISSION REGION I 631 PARK AVENUE KING OF PRUSSIA, PENNSYLVANIA19406
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Docket No. 50-244 AU6 Z4en Rochester Gas and Electric Corporation ATTN:
Mr. Leon D. White, Jr.
Vice President Electric and Steam Production 89 East Avenue Rochester, New York 14649 Gentlemen:
This Circular is provided as an early notification of a possible significant matter.
It is expected that recipients will review the information for pos-sible applicability to their facilities.
No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Bul-letin wi'll be issued to recommend or request specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional 0ffice.
Sincerely,
//4l/g4 p Boyce H. Grier Director
Enclosures:
l.
IE Circular No. 79-17 2.
List of IE Circulars Issued in the Last 6 Months cc w/encls:
B.
A. Snow, Plant Superintendent S. Bullock, gC Engineer Lex K. Larson, Esquire
ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Circular No. 79-17 Date:
August 14, l979 Page 1 of 1 CONTACT PROBLEM IN SB-12 SWITCHES ON GENERAL ELECTRIC METALCLAD CIRCUIT BREAKERS The General Electric Company, Switchgear Department in Philadelphia, reported to the'NRC on July 3, 1979, an intermittent contact problem in SB-12 switches.
This intermittent contact problem will cause a lack of, continuity through the "a" contact of the switch that is used to energize the trip coil of the circuit breaker.
Investigation disclosed that a die used to form a hole in the contact arms of the switch had worn, resulting in elongated holes.
This condition could permit the contact bridge member to move laterally relative to the contact arm, occasionally resulting in improper "a" contact wipe.
The worn die has been corrected, and all switches shipped on or after July 1, 1979, include this correction.
A review of the history of these components indicates that switches shipped in the time period of August 1, 1978 to July 1, 1979, coul'd have this problem.
The trip coil and auxiliary switch portion of the trip circuit is monitored for continuity by a red light on the front door of the switchgear.
This light is lit when the breaker is closed and the control circuits are energized.
If the red light is lit, this indicates that the "a" contacts of the switch are closed, and that a trip signal will trip the breaker.
Based on the above, the licensees are advised to do the following:
l.
Insure that all General Electric Company Metalclad Circuit Breakers shipped to your facilities during the period from August 1, 1978 to July 1, 1979 and used in or affecting the operation of safety related equipment are furnished with new SB-12 control switches as promptly as possible.
2.
Pending replacement of SB-12 control switches administrative controls should be initated to assure the red light which demonstrates contact continuity, is lit and remains lit each time. these circuit breakers are closed.
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 IE Circular No. 79-17 Date:
August 14, 1979 Page 1 of 2 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Circular No.
79"03 Subject Inadequate Guard Training/gualification and Falsified Training Records First Date of Issue 2/23/79 Issued To All Holders of and Applicants for Special Nuclear Material Licenses in Safeguards Group I 79"04 Loose Locking Nut on 3/16/79 Limitorque Valve Operators All Power Reactor Facilities with an OL or CP 79-05 Moisture Leakage in Stranded Mire Conductors 3/20/79 All Power Reactor Facilities with an OL or CP 79-06 Failure to Use Syringe 4/19/79 and Bottle Shields in Nuclear Medicine All Holders of Medical Licenses Except Teletherapy Licenses 79-07 Unexpected Speed Increase of Reactor Recirculation MG Set Resulted in Reactor Power Increase 5/2/79
,All BWR Power Reactor Facilities with an OL or CP 79-08 Attempted Extortion-5/18/79 Low Enriched Uranium All Fuel Facilities and Licensed Reactors 79-09 Occurrences of Split or-Punctured Regulator Diaphragms in Certain Self-Contained Breathing Apparatus 6/22/79 All Materials Priority I, Fuel Cycle and Operating Reactor Licensees
Enclosure 2
IE Circular No. 79-17 Date:
August 14, 1979 Page 2 of 2 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Circular No.
79-10 79"11 79-12 79-13 79-14 79"15 79-16 Subject 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 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 First Date of Issue 6/26/79 6/27/79 6/28/79 7/16/79 7/16/79 8/8/79 8/16/79 Issued to All Power Reactor Facilities with an OL or CP All Applicants 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 All Materials Priority I, Fuel Cycle and Opera-ting Power Reactor Licensees All Radiography Licensees
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