Reactor Cavity Seal Ring Generic Issue (Generic Letter 79-43)

GL79043 

                               UNITED STATES 
                       NUCLEAR REGULATORY COMMISSION 
                          WASHINGTON. D. C. 20555 

Docket Nos. 50-295 and 50-304 

Mr. Cordell Reed 
Assistant Vice President 
Commonwealth Edison Company 
Post Office Box 767 
Chicago, Illinois 60690 

Dear Mr. Reed: 

RE: REACTOR CAVITY SEAL RING GENERIC ISSUE (PWR) 

We have completed our review of your response to our letter of February 2, 
1978, in regard to the potential for the reactor cavity annulus seal ring to
become a destructive missile in the event of a loss-of-coolant accident pipe
break inside the reactor cavity. 

Your response acceptably resolves this issue for Zion station, Unit Nos. 1 
and 2. 

                                   Sincerely, 


                                   A. Schwencer, Chief 
                                   Operating Reactors Branch #1 
                                   Division of Operating Reactors 

cc: See next page


Mr. Cordell Reed 
Commonwealth Edison Company 

cc:  Robert J. Vollen, Esquire 
     109 North Dearborn Street 
     Chicago, Illinois 60602 

     Dr. Cecil Lue-Hing 
     Director of Research and Development 
     Metropolitan Sanitary District 
          of Greater Chicago 
     100 East Erie Street 
     Chicago, Illinois 60611 

     Zion-Benton Public Library District 
     2600 Emmaus Avenue 
     Zion, Illinois 60099 

     Mr. Phillip P. Steptoe 
     Isham, Lincoln and Beale 
     Counselors at Law 
     One First National Plaza 
     42nd Floor Chicago, Illinois 60603 

     Susan N. Sekuler, Esquire 
     Assistant Attorney General 
     Environmental Control Division 
     188 West Randolph Street, Suite 2315 
     Chicago, Illinois 60601