United States Nuclear Regulatory Commission - Protecting People and the Environment

Bulletin 74-006: Defective Westinghouse Type W-2 Control Switch Component



BL74006 

                               UNITED STATES 
                         ATOMIC ENERGY COMMISSION 
                         WASHINGTON, D.C. 20545  

                                MAY 22 1974 

J. P. O'Reilly, Director of Region I
N. C. Moseley, Director of Region II 
J. G. Keppler, Director of Region III 
E. M. Howard, Director of Region IV 
R. H. Engelken, Director of Region V 

RO BULLETIN #74-6 DEFECTIVE WESTINGHOUSE TYPE W-2 
CONTROL SWITCH COMPONENT 

The enclosed RO Bulletin #74-6 is forwarded for dispatch to all PWR's with 
Construction Permits or Operating Licenses. 


                                        Harold D. Thornburg, Chief 
                                        Field Support & Enforcement Branch 
                                        Directorate of Regulatory Operations

Enclosure:  
DRO Bulletin #74-6  

cc:  D. F. Knuth, RO 
     J. G. Davis, RO 
     B. H. Grier, RO 
     A. Giambusso, L 
     J. Hendrie, L 
     K. R. Goller, L 
     R. S. Brodsky, NR 
.

TO ALL PWR'S WITH OPERATING LICENSES                   Date: 5/22/74 
AND CONSTRUCTION PERMITS                               DRO Bulletin #74-6 

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 RO inspections. This information may have applicability at your 
facility(ies). The action requested on your part is identified in the 
enclosed Bulletin. 

If you have any questions on the contents of this Bulletin, please do not 
hesitate to contact us. 

                                   Sincerely, 


                                   Director 

Enclosure: 
DRO Bulletin No. 74-6 
.

                               RO BULLETIN 

         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: 

A.   Description of Circumstances 

     Plant A 

     By notification from Westinghouse Nuclear Service Division, dated 
     February 8, 1973, the licensee was informed of a defect in certain 
     Westinghouse Type 17-2 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 
     expansion pins inserted) to be cracked. None of the replacement parts 
     were installed. 

     Plant B 

     Following the same notification from Westinghouse as 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
     request of the Atomic Energy Commission the pull levers in these 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, within 30 days of receipt of this. Bulletin, 
          in writing, of the extent of such use and the actions you plan to 
          take or have taken to correct the problem with the original W-2 
          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. 
.

BL74006 

                              UNITED STATES 
                         ATOMIC ENERGY COMMISSION 
                          WASHINGTON, D.C. 20545 

J. P. O'Reilly, Director of Region I 
N. C. Moseley, Director of Region II 
J. G. Keppler, Director of Region III 
E. M. Howard, Director of Region IV 
R. H. Engelken, Director of Region V 

RO BULLETIN #74-6 DEFECTIVE WESTINGHOUSE TYPE W-2 
CONTROL SWITCH COMPONENT 

After further evaluation it has been decided that RO Bulletin #74-6 should 
be dispatched to all BWR facilities with Construction Permits or Operating 
Licenses. The decision is based on the fact that it has been found that one 
of the BWR facilities has been found to be employing the Westinghouse Type 
W-2 switch in safety related systems. Please issue the Bulletin to all BWR 
licensees with CP's and OL's. 


                                        Harold D. Thornburg, Chief 
                                        Field Support &  Enforcement Branch 
                                        Directorate of Regulatory Operations 

Enclosure: 
Bulletin #74-6 

cc:  D. F. Knuth, RO 
     P. A. Morris, RO 
     J. G. Davis, RO 
     B. H. Grier, RO 
     A. Giambusso, L 
     J. Hendrie, L 
     K. R. Goller, L 
     R. S. Bordsky, NS 
.

                             SAMPLE LETTER  

                                                            DATE 
NAME AND ADDRESS                                            Docket No. (s) 

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 RO inspections. This information may have applicability at your 
facility(ies). The action requested on your part is identified in the 
enclosed Bulletin. 

If you have any questions on the contents of this Bulletin, please do not 
hesitate to contact us. 

                                   Sincerely, 


                                   Director 

Enclosure: 
DRO Bulletin No. 74-6  
.

                                                  June 11, 1974 
                                                  Directorate of Regulatory 
                                                  Operations Bulletin 74-6 

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: 

A.   Description of Circumstances 

     Plant A 

     By notification from Westinghouse Nuclear Service Division, dated 
     February 8, 1973, the licensee was informed of a defect in certain 
     Westinghouse Type W-2 control switches. Repair kits were ordered to 
     replace the defective components. Inspection of the replacement parts, 
     prior to installation, revealed 8 of 14 pull levels (metal discs with 
     expansion pins inserted) to be cracked. None of the replacement parts 
     were installed. 

     Plant B 

     Following the same notification from Westinghouse as above, repair kits
     were ordered to replace the defective component. Replacement parts were
     installed in forty switches. One pull lever gas found cracked during 
     installation and discarded. Two spare repair kits were retained. At the
     request of the Atomic Energy Commission the pull levers in these 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 
          notify this office, within 30 days of receipt of this Bulletin, in
          writing, of the extent of such use and the actions you plan to 
          take or have taken to correct the problem with the original W-2 
          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. 
Page Last Reviewed/Updated Tuesday, July 23, 2013