ML18139A149
| ML18139A149 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 04/02/1980 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Ferguson J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 8004150105 | |
| Download: ML18139A149 (4) | |
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"'° In Reply Refer To:
RII:JPO 50-338, 50-339 5~50-405 e¥Lso-2ap e
UNITED STATES NUCLEAR REGULATORY COMMISSION REGION II 101 MARIETTA ST., N.W., SUITE 3100
' ATLANTA,GEORGIA30303 APR 2 1980 Virginia Electric and Power Company Attn:. J. H. Ferguson Executive Vice President-Power P.O. Box 26666 Richmond, VA 23261 Gentlemen:*
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This Information Notice 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; however, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions, if required. If you have questions regarding this matter, please contact the director of the appropriate NRC regional office.
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,r-.James-P: O Rei~
Director
Enclosures:
- 1.
IE Information Notice No. 80-13
- 2.
List of IE Information Notices Recently Issued
- 10041SO IO!S
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Virginia Electric and Power Company cc w/encl:
e W.R. Cartwright, Station Manager Post Office Box 402 Mineral, Virginia 23117 P. G. Perry
-Senior Resident Engineer Post Office Box 38 Mineral, Virginia 23117 W. L. Stewart, Manager Post Office Box 315 Surry, Virginia 23883. -*_ -:,.. :_, __ --*-* -----*-** ---- --**.: ___ _
e APR 2 1980 J,o
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UNITED STATES NUCLEAR REGU1.ATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 April 2,. 1980 e
SSINS No. : 6870 Accession No. :
8002280650 IE Information Notice No. 80-13 GENERAL ELECTRIC TYPE SBM CONTROL SWITCHES DEFECTIVE CAM FOLLOWERS Description of Circumstances:
This Information Notice alerts licensees and holders of construction permits of a potential defect in the cam followers of General Electric (GE) Type SBM control switches.
Based on preliminary information, it appears that the defect is limited to switches manufactured prior to 1976 with cam followers of polycarbonate material, such as Lexan.
In brief, the problem is initiated by exposing such polycarbonate material to hydrocarbons.
Such exposure leads to severe cracking having a rock salt appearance which ultimately could progress to mechanical failure.,It has be*en determined that such exposure has occurred during fabrication and could occur while performing maintenance (e.g. cleaning the contacts).
On February 22 and March 10, 1980 we were informed that SBM switches with defective cam followers had been found at Diablo Canyon Unit 1 and at the Cooper Station, respectively. Although the information was preliminary and sketchy, the problem is a long-standing one for which GE has issued "Service Information Letters" to its BWR customers.
The problems associated with such switches, however, are not restricted to GE customers as _evidenced by the Diablo Canyon case. Furthermore, these switches have a broad range of applica-tion. For example, t~e defective switches at the Cooper Station were used principally as hand control switches, most of which were located in the control room.
In contrast., t~ose at Diablo Canyon Unit 1 were used as auxiliary contacts on the 4KV and 12KV "Magna Blast" circuit breakers., with three SBM switches used per breaker: (1) a breaker mounted auxiliary switch, (2) a cell mounted auxiliary switch, and (3) a cell interlock switch.
This information is provided as notification of a possible significant matter that is still under review by the NRC staff. 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 you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
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IE Information Notice No. 80-13 April° 2, 1980 Information Notice.No.
80-i3 80-12 80-11 80-10.
80-09 80-08 80-07 80-06 80-05 80-04 80-03 80-02 RECENTLY ISSUED IE INFORMATION NOTICES Subject Date Issued General Electric Type SBM 4/2/80 Control Switches - Defective Cam Followers Instrument Failure Causes 3/31/80 Opening of PORV and Block Valve General Problems with ASCO Valves in Nuclear Application Including Fire Protection Systems Partial Loss of Non-Nuclear Instrument System Power Supply During Operation Possible Occupational Health Hazard Associated with Closed Cooling Systems The States Company Sliding Link Electrical Terminal Block Pqmp Shaft Fatigue Crackj.ng Notification of Significant Events Chloride Contamination of Safety Related Piping BWR Fuel Exposure in Excess of Limits Main Turbine Electro-Hydraulic Control System 8X8R Water Rod Lower End Plug Wear 3/14/80 3/7/80 3/7/80 3/7/80 2/29/80 2/27/80
'2/8/80 2/4/80 1/31/80 1/25/80 e
Enclosure Issued To All holders of Power Reactor OLs and CPs All holders of Power Reactor OLs and CPs All holders of Reactor OL, CP, fuel fabrica-tion and processing facilities All power reactor facilities holding OLs and CPs All holders of power reactor OLs and near term CPs All power reactor facilities with an OL or a CP All Light Water Reactor Facilities holder power reactor OLs and CPs All holders of Reactor OLs and to near term OL applicants All licensees of nuclear power reactor facilities and applicants and holders of nuclear power reactor CPs All BWR' s holding a power react.gr OL or CP All holders of power reactor OLs and CPs All BWR Facilities holder power reactor OLs or CPs