ML20127N733
| ML20127N733 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 06/28/1974 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Wachter L NORTHERN STATES POWER CO. |
| References | |
| IEB-74-06, IEB-74-6, NUDOCS 9212010399 | |
| Download: ML20127N733 (1) | |
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DIRECTORATE OF REGULATORY OPERATIONS REGION lil 799 ROOSEVELT ROAD m
OLEN ELLYN. ILLINOIS 60137 (312) 056-2860 JUN 2 8 1974 Northern States Power Company Docket No. 50-263 ATTN: Mr. Leo Wachter, Vice President Power Production and Systen Operation 414 Nicollet Mall Minneapolis, Minnesota 55401 Gentlemen The enclosed DRO Bulletin No. 74-6 " Defective Westinghouse Type W-2 Control Switch Component" is sent to provide you with information obtained during recent 10 inspections. This information may have applicability at your facility. The action requested on your part is identified in the l
enclosed Bulletin.
i If you have any questions on the contents of thia Bulletin, please do not hesitate to contact us.
Sincerely, James G. Kappler Regional Director i
Enclosures DRO Bulletin No. 74-6 i
bec: DR Central Files RO Files PDR Local PDR OGC, Beth, P-506A Anthony Roisman 9212010399 740628 PDR ADOCK 05000263-G PDR
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June 28, 1974 DRO Bulletin-No. 74-6 a
DEFECTIVE WESTINGHOUSE TYPE W-2 CONTROL SWITCH COMPONENT Recent inspection findings indicate a possible safety problem may-exist in plants employing Westinghouse Type W-2 control switches. The information is as follows:
i A.
Description of Circumstances Plant A By notification from Westinghouse Nuclear Service Division, dated February 8, 1973, the licensee wa9 informed of a defect in certain Westinghouse Type W-2 control switches. Repair kits were ordered to replace the defective component.
Inspection of the replacement parts, prior to installation, revealed 8 of 14 pull _ levers (metal discs with
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expansion pins inserted) to be cracked. None of the replacement' parts were installed.
Plant B Following the same notification from Westinghouse a's above,. repair kits were ordered-to replace the defective component. Replacement parts were installed in forty switches. One pull lever was found. cracked during installation and discarded. Two spare repair kits were retained. At the requ'est of the Atomic Energy Commission the pull levers in these i
two spare kits were inspected. One of the two was found to be cracked.
B.
Action Requested 1.
If these switches are used in safety systems in your plant please inform this office in writing within 30 days of receipt of this Bulletin, of the extent of such use and the actions you plan to take or have taken to correct the problem with the original W switches and to assure that repair parts are not defective.- If corrective actions have not been completed, it is requested that your scheduled date of completion be provided.
2.
If this matter does not apply to your plant, a negative report is requested.
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