Information Notice No. 88-73, Supplement 1: Direction-Dependent Leak Characteristics of Containment Purge Valves

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

                                February 27, 1989

                                                 CHARACTERISTICS OF
                                                 CONTAINMENT PURGE VALVES


All holders of operating licenses or construction permits for nuclear power 


This information notice supplement is being provided to present information 
provided by Fisher Controls International, Inc. on the characteristics of 
containment purge valves described in Information Notice No. 88-73.  It is
expected that recipients will review the information for applicability to 
their facilities and consider actions, as appropriate, to avoid similar 
problems.  However, suggestions contained in this information notice do not 
constitute NRC requirements; therefore, no specific action or written response
is required.


The NRC issued Information Notice No. 88-73 to all holders of operating 
licenses or construction permits for nuclear power reactors to provide 
information on an event at the Diablo Canyon Nuclear Power Plant, Unit 1, 
involving unexpected direction-dependent leakage through containment purge 
valves.  These valves were Fisher Controls Series 9200 butterfly valves.        

After the issuance of Information Notice No. 88-73, Fisher Controls provided 
additional information to their customers and the NRC on the direction-
dependent leak characteristics of the Series 9200 valves.  This information is
being provided as Attachment 1.  Any questions or clarifications regarding the
Fisher information may be obtained by contacting the appropriate Fisher 
Controls representative.

.                                                       IN 88-73, Supplement 1
                                                       February 27, 1989
                                                       Page 2 of 2

No specific actions or written response is required by this information 
notice.  If you have any questions about this matter, please contact the 
technical contact listed below or the Regional Administrator of the 
appropriate regional office. 

                              Charles E. Rossi, Director
                              Division of Operational Events Assessment
                              Office of Nuclear Reactor Regulation

Technical Contact:  Jaime Guillen, NRR
                    (301) 492-1170

1.  Fisher Anomaly Notice No. FAN 88-2
2.  List of Recently Issued NRC Information Notices
.                                                       Attachment 2
                                                       IN 88-73, Supplement 1 
                                                       February 27, 1989
                                                       Page 1 of 1

                             LIST OF RECENTLY ISSUED
                            NRC INFORMATION NOTICES 
Information                                  Date of 
Notice No._____Subject_______________________Issuance_______Issued to________

89-20          Weld Failures in a Pump       2/24/89        All holders of OLs
               of Byron-Jackson Design                      or CPs for nuclear
                                                            power reactors. 

89-19          Health Physics Network        2/23/89        All holders of OLs
                                                            or CPs for nuclear
                                                            power reactors, 
                                                            and the following 
                                                            fuel facilities:  
                                                            Nuclear Fuel 
                                                            Services of Erwin,
                                                            General Atomic, 
                                                            UNC Montville, B&W 
                                                            LRC Lynchburg, and 
                                                            B&W Lynchburg. 

89-18          Criminal Prosecution of       2/22/89        All holders of OLs
               Wrongdoing Committed by                      or CPs for nuclear
               Suppliers of Nuclear                         power reactors. 
               Products or Services 

89-17          Contamination and Degra-      2/22/89        All holders of OLs
               dation of Safety-Related                     or CPs for nuclear
               Battery Cells                                power reactors. 

89-16          Excessive Voltage Drop        2/16/89        All holders of OLs
               in dc Systems                                or CPs for nuclear
                                                            power reactors. 

89-15          Second Reactor Coolant Pump   2/16/89        All holders of OLs
               Shaft Failure at Crystal                     or CPs for nuclear
               River                                        power reactors. 

89-14          Inadequate Dedication         2/16/89        All holders of OLs
               Process for Commercial                       or CPs for nuclear
               Grade Components Which                       power reactors. 
               Could Lead to Common Mode 
               Failure of a Safety System 

89-13          Alternative Waste Management  2/8/89         All holders of NRC
               Procedures in Case of Denial                 specific licenses.
               of Access to Low-Level Waste 
               Disposal Sites 
OL = Operating License
CP = Construction Permit 

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