United States Nuclear Regulatory Commission - Protecting People and the Environment

Bulletin 74-003A: Failure of Structural or Seismic Support Bolts on Class I Components



BL74003A 

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

                               APR 29 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 

SUPPLEMENTAL INFORMATION - RO BULLETIN #74-3 "FAILURE OF STRUCTURAL OR 
SEISMIC SUPPORT BOLTS ON CLASS I COMPONENTS" 

The enclosed supplemental information to previously issued RO Bulletin #74-3
is forwarded for dispatch to all BWR and PWR licensees wit,il Operating 
License and those licensees having an anticipated fuel load date prior to 
January 31, 1975. 


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

Enclosure: 
DRO Bulletin #74-3A 

cc:  D. F. Knuth, RO 
     J. G. Davis, RO 
     A. Giambusso, L 
     J. Hendrie, L 
     K. R. Goller, L  
.

BL74003A 

To All BWR and PWR With Current 
Operating License and Those                            Date: 4/26/74 
Having An Anticipated Fuel                             DRO Bulletin #74-3A 
Load Date Prior to January 31, 1975 

Gentlemen: 

The enclosed supplement to DRO Bulletin No. 3 "Failure of Structural or 
Seismic Support Bolts on Class I Components" is being sent to provide you 
with additional information relative to the omission of certain stiffeners 
and gussets in addition to defective welding reported at other facilities. 

This information may have applicability at your facility(ies). Action 
requested on your part is identified in Section B of the enclosed 
supplement. 

                                        Sincerely,  


                                        Director 

Enclosure: 
Supplement to DRO Bulletin #74-3 
.

SUPPLEMENTAL INFORMATION RELATING TO RO BULLETIN NO. 74-3A 

Information was recently received that defective welding had been identified
on steam generator support structures supplied to VEPCO, the North Anna, 
project, by Sun Shipyard Corporation of Chester, Pennsylvania. The Sun 
Shipyard Corporation also supplied similar items for the Public Service 
Electric & Gas Company, Salem 1 & 2, as well as the Consolidated Edison 
Company, Indian Point 3, projects. 

A.   Description of Circumstances 

     A special inspection of these items at the Salem site revealed not only
     areas of defective welding, but also omission of certain stiffeners and
     gussets shown on design drawings. The Consolidated Edison Company also 
     noted similar type problems. 

     The Sun Shipyard Corporation indicates that no similar components were 
     provided other nuclear facilities. 

B.   Action Requested 

     In view of these particular type problems with seismic category 1 
     components as defined in Regulatory Guide 1.29, it is requested that: 
     
     1.   The inspection program requested by Regulatory Operations Bulletin
          74-3-"Failure of Structural or Seismic Support Bolts on Class 1 
          Components" include provisions that could detect problems of the 
          type outlined above regardless of your supplier. 
.

                                  - 2 - 

As stated in Regulatory Operations Bulletin 74-3, RO inspectors will review 
your detailed written programs and procedures. 
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