ML19249C003
| ML19249C003 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 08/14/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Mary Johnson, Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7909070210 | |
| Download: ML19249C003 (2) | |
Text
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NUCLEAR REGULATORY COMMISSION 3
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REGION 11
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101 MARIETT A sT., N.W, SUITE 3100 o
AT LANT A, GEORGI A 30303 g
AUG 141979 In Reply Refer To:
RII:JPO 50-395 South Carolina Electric and Gas Cr,pany ATTN:
T. C. Nichols, Jr., Vice President Power Production and Systems Operations P. O. Box 764 Columbia, SC 29218 Gentlemen:
This Circular is provided as an early notification of a possible significant is expected that recipients will review the information for possible matter.
It No specific action or response is requested applicability to their facilities.
If further NRC evaluatiot.s so indicate, an IE Bulletin vill be at this time.
irsued to recommend or request specific licensee actions.
If you have questions regarding this matter, please contact the Director of the aopropriate NRC Regional Office.
Sincerely, p, O'
'ames P. O'Reilly re: tor
Enclosures:
1.
IE tircular No. 79-17 2.
List of IE Circulars Issued in the Last 6 Months
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AUG 141979 South Carolina Electric and Gas Company cc w/ encl:
T. B. Co nne rs, J r.
Conners, Moore and Corber 1747 Pennsylvania tvenue, N.W.
0006 Washington, D.C.
4 A. A. Smith Quality Assurance Post Office Box 8 Jenkirsville, South Carolina 29065 O. S. Bradham, Manager Nuclear Operations Post Office Box 8 Jenkinsville, South Carolina 29065
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6830 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMEh7 WASHINGTON, D.C.
20555 August 14, 1979 IE Circular No. 79-17 CONTACT PROBLEM IN SB-12 SWITCHES ON GENERAL ELECTRIC METALCLA BREAKERS The General Electric Company, Switchgear Department in Philadelphia, reported to the NRC on July 3, '979, 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 Investigation disclosed that a die used to form a hole in the contact breaker.
This condition could of the switch had worn, resulting in elongated holes.
a rmt permit the contact bridge member to move laterally relative to the contact arm, The worn die has been occasionally resulting in improper "a" contact wipe.
corrected, and all switches shipped on or after July 1, 1979, include this A review of the history of these components indicates that switches correction.
shipped in the time period of August 1, 1978 to July 1, 1979, could have this The trip coil and auxiliary switch portion of the trip circuit is problem.
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 If the red light is lit, this indicates that the "a" contacts of energized.
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:
Insure that all General Elec+ ric Company Metalclad Circuit Breakers 1.
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.
Pending replacement of SB-12 control switches administrative controls 2.
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 "egional Office.
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Enclosure IE Circular No. 79-17 Page 1 of 2 August 14, 1979 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Date of Issued to Circular Subject Issue No.
79-03 Inadequate Guard Training-2/23/79 All Holders of and applicants Qualification and Falsified for Special Nuclear Training Records Material Licenses in Safeguards Group I 79-04 Loose Locking Nut On 3/16/19 All Holders of Reactor OLs or cps Limitorque Valve Operators 79-05 Moisture Leakage In 3/20/79 All Holders of Reactor OLs or cps Stranded Wire Conductors 79-06 Failure to Use Syringe 4/19/79 All Holders of Medical Licensees and Battle Shields in except teletherapy Nuclear Medicine licensees 79-07 Unexpected Speed Increase 5/2/79 All Holders of BWR OL's or CP's of Reactor Recirculation MG Set Resulted in Reacter Power Increase 79-08 Attempted Extortion Low 5/18/79 All Fuel Facilities Licensed by NRC Enriched Uranium 79-09 Occurrences of Split or 6/22/79 All Materials Priority I, Fuel Punctured Regulator Diaphragos In Certain Self Contained Cycle and Operating Reactor Licensees Breathing Apparatus 79-10 Pipefittings Manufactured 6/26/79 All Power Reactor Licensees with a from Unacceptable Material CP and/or OL 79-11 Design / Construction 6/27/79 All Applicants for, and Holders Interface Problem of Power Reactor cps
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Enclosure IE Circular No. 79-17 Page 2 of 2 August 14, 1979 LISTING OF 1F CIRCULARS ISSUED IN LAST SIX MONTHS Date of Issued to Circular Subject Issued No.
79-12 Potential Di 21 Generator 6/28/79 All Power Reactors Turbocharger Problem Operating Facilities and all Utilities having a CP 79-13 Replacement of Diesel 7/10/79 All Power Reactor Operating Facilities Fire Pump Starting and all Utilities Contactors having a CP 79-14 Unauthorized Procurement and 7/13/79 All Medical Licensees Distribution of XE-133 except Teletheraphy Medical Licensees and to all Radiopharmaceu-tical Suppliers 79-15 Bursting of High Pressure Hose 8/8/79 All Materials Priority I, and Malfunction of Relief Fuel Cycle and Operating Power Reactor Licensees Valve "0" Ring in Certain Sc1f-Contained Breathing Apparatus 79-16 Excessive Radiation Exposures 8/16/79 All Radiography To Members Of The General Public Licensees And A Radiographer il it i 0