ML19249B894
| ML19249B894 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 08/14/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 7909070049 | |
| Download: ML19249B894 (1) | |
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o UNITED STATES f j C, f
3 NUCLEAR REGULATORY COMMISSION y
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1990 N. CALIFORNI A BOULEVARD
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SUIT E 202, WALNUT CREEK PL AZA WALNUT CHEE K, CALIFORNI A 94596
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August 14, 1979 Docket flo. 50-344 Portland General Electric Company 121 S. 'E Salmon Street Portland, Oregon 97204
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Attention: f1r. Charles Goodwin, Jr.
Assistant Vice President Gentlemen:
This Circular is provided as an early notif.ication of a possible significant It is expected that recipients will review the information for possible matter.
applicability to their facilities. flo specific action or response is requested at this time.
If further itRC 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 t!RC Regional Office.
Sincerely, 4 >s:2w t R. H. Engelken Director
Enclosures:
1.
IE Circular ?!o. 79-17 2.
List of IE Circulars Issued in Last Six lionths cc w/encls.
B. Withers, PGE F. C. Gaidos, PGE Dl a w> ud F
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Accession No:
7908090272 SSINS:
6830 UNITED STATES NUCLEAR REGULATORY COBilSSION OFFICE OF INSPECTION AND ENFORCEliENT WASHINGTON, D.C.
20555 August 14, 1979 IE Circular No. 79-17 CONTACT PROBLEM IN SB-12 SWITCHES ON GEllEPAL ELECTRIC fiETALCLAD CIRCUIT E?. eke ?.
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 continuiby 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 raenber to nove 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, 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 lignt 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 Metelclad 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 denonstrates 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.
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IE Circular flo. 79-17 Enclosure August 14, 1979 Page 1 of 2 LISTIf1G OF IE CIRCULARS ISSUED If1 LAST SIX fl0NTHS Circular Subject Date of Issued to fio.
Issue 79-03 Inadequate Guard Training-2/23/79 All Holders of Qualification and Falsified and applicants Training Records for Special fiuclear flaterial Licenses in Safeguards Group I 79-04 Loose Locking f;ut On
'3/16/79 All Holders of Limitorque Valve Reactor OLs or cps Operators 79-05 f1oisture Leakage In 3/20/79
- All Holders of Stranded Wire Conductors Reactor OLs or cps 79-06 Failure to Use Syringe 4/19/79 All Holders of and Battle Shields in fledical Licensees f,'uclear l'edicire except teletherapy licensees 79-07 Unexpected Speed Increase 5/2/79 All Holders of of Reactor Recirculation BWR OL 's or CP's NG Set Resulted in Reactor Power Increase 79-08 Attempted Extortion - Low 5/18/79 All Fuel Facilities Enriched Uraniun Licensed by fiRC 79-09 Occurrences of Split or 6/22/79 All fiaterials Punctured Regulator Diaphragms Priority I, Fuel In Certain Self Contained Cycle and Operating Breathing Apparatus Reactor Licensees 79-10 Pipefittings flanufactured 6/26/79 All Power Reactor from Unacceptable flaterial Licensees with a CP and/or OL 79-11 Design / Construction 6/27/79 All Applicants Interface Problem for, and Holders of Power Reactor cps
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IE Circular No. 79-17 Enclosure August 14, 1979 Page 2 of 2 LISTING OF IE CIRCULARS ISSUED IN LAST SIX MONTHS Circular Sabject Date of Issued to No.
Issued 79-12 Potential Disel Generator 6/28/79 All Pcwer Reactors Turbocharger Problen Operating Facilities and all Utilities having a CP 79-13 Replacement of Diesel 7/10/79 All Power Reactor Fire Pump Starting Operating Facilities Contactors and all Utilities 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 Pose 8/8/79 All Materials Priority I, and Malfunction of Relief Fuel Cycle and Operating Valve "0" Ring in Certain Self-Power Reactor Licensees Contained Breathing Apparatus 79-16 Excessive Radiation Exposures 8/16/79 All Radiography To Members Of The General Public Licensees And A Radiographer r
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