ML18130A532
| ML18130A532 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 08/14/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 7909070213 | |
| Download: ML18130A532 (5) | |
Text
In Reply Refer To:
RII:JPO 50-338, 50-339
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e UNITED STATES NUCLEAR REGULATORY COMMISSION REGION II 101 MARIETTA ST., N.W., SUITE 3100 ATLANTA, GEORGIA 30303 Virginia Electric and Power Company ATTN:
W. L. Proffitt Senior Vice President, Power P. O. Box 26666 Richmond, VA 23261 Gentlemen:
This Circular is provided as an early notification of a possible significant matter. It is expected that recipients will review the information for possible applicability to their facilities.
No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Bulletin will 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 Office.
Enclosures:
- 1.
IE Circular No. 79-17
- 2.
List of IE Circulars Issued in the Last 6 Months Sincerely; rector P,o/:]:~
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e V1~g1uia Electric and l'u.,.,*t..r Company,- l
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~. Cartwright, Station Manager
}'o *, t (' f fi ce Box 402
!'!i1,eral, Virginia 23117 F. G. Perry
- ..1'1, i.u1' Resident Engineer ro~t Uffice Box 38 Miu'!ral, Virginia 23117
~. s. SLewart, Manager l'0,~ Office Box 315
~ur:y, Virginia 23883 AUG 14 197Y
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UNITED STATES e
Accession No:
7908090272 SSINS:
6830 /
NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 August 14, 1979 IE Circular No. 79-17 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 11a 11 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 11a" 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, could 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:
- 1.
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.
IE Circular No. 79-17 August 14, 1979 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Circular No.
79-03 79-04 79-05 79-06 79-07 79-08 79-09 79-10 79-11 Subject Inadequate Guard Training-Qualification and Falsified Training Records Loose Locking Nut On Limitorque Valve Operators Moisture Leakage In Stranded Wire Conductors Failure to Use Syringe and Battle 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 Manufactured from Unacceptable Material Design/Construction Interface Problem Date of Issue 2/23/79 3/16/79 3/20/79 4/19/79 5/2/79 5/18/79 6/22/79 6/26/79 6/27 /79 Enclosure Page 1 of 2 Issued to All Holders of and applicants for Special Nuclear Material Licenses in Safeguards Group I All Holders of Reactor OLs or CPs All Holders of Reactor OLs or CPs All Holders of Medical Licensees except teletherapy licensees All Holders of BWR OL's or CP's All Fuel Facilities Licensed by NRC All Materials Priority I, Fuel Cycle and Operating Reactor Licensees All Power Reactor Licensees with a CP and/or 01 All Applicants for, and Holders of Power Reactor CPs
e IE Circular No. 79-17 August 14, 1979 C.ircular No.
79-12 79-13 79-14 79-15 79-16 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Subject Date of Issued Potential Disel Generator 6/28/79 Turbocharger Problem Replacement of Diesel 7/10/79 Fire Pump Starting Contactors Unauthorized Procurement and 7/13/79 Distribution of XE-133 Bursting of High Pressure Hose 8/8/79 and Malfunction of Relief Valve "O" Ring in Certain Self-Contained Breathing Apparatus Excessive Radiation Exposures 8/16/79 To Members Of The General Public And A Radiographer Enclosure Page 2 of 2 Issued to All Power Reactors Operating Facilities and all Utilities having a CP All Power Reactor Operating Facilities _
and all Utilities having a CP All Medical Licensees except Teletheraphy Medical Licensees and to all Radiopharmaceu-tical Suppliers All Materials Priority I, Fuel Cycle and Operating Power Reactor Licensees All Radiography Licensees