Information Notice No. 89-20: Weld Failures In a Pump of Byron-Jackson Design

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

                                February 24, 1989



All holders of operating licenses or construction permits for nuclear power


This information notice alerts addressees to weld failures in a primary loop
recirculation pump of Byron-Jackson design experienced by owners of boiling
water reactors (BWRs) in a foreign country.  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 con-
tained in this information notice do not constitute NRC requirements; 
therefore, no specific action or written response is required. 

Description of Circumstances:

The following information is related to boiling water reactors; however, the
nature of the weld failures was such that potentially all pumps of similar
design could be affected.

     1.   In 1984, a foreign BWR experienced a failure in the attachment 
          weld of a ring that surrounds the bearing housing component of 
          a pump manufactured by Byron-Jackson but fabricated and assembled 
          by a foreign company.  The power company operating the BWR per-
          formed repairs using fillet welds applied at the failed locations.  
          During inspections in 1988 cracks were found at the same weld 
          locations in both recirculation pumps.  The repair involved ap-
          plying full penetration butt welds with some axial realignment 
          of the ring.
     2.   Similar problems were recently reported at another BWR plant in
          the same country in which the first event took place.  Significant 
          vibration was observed during a normal end-of-cycle coastdown for 
          annual maintenance.  The plant was immediately shut down for 
          inspection.  It was found that the ring and impeller had broken, 
          and some fasteners were found in various sections of the recircu-
          lation loop.

.                                                            IN 89-20
                                                            February 24, 1989
                                                            Page 2 of 2

     3.   As a result of the 1984 and 1988 incidents, owners of BWRs in the
          foreign country began a program of inspection and repair using the
          full penetration welds and realignment of the ring.  The unit that
          experienced the broken ring and impeller had not yet been inspected
          for deficiencies in the welding before the failure occurred.  As a
          result of the failure, one of seven other units of a similar power
          level was shut down because it had not been inspected or repaired.

No specific action or written response is required by this information notice.  
If you have any questions about this matter, please contact one of the 
technical contacts 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 Contacts:  N. Prasad Kadambi, NRR
                     (301) 492-1153

                     P. T. Kuo, NRR
                     (301) 492-0907

Attachment:  List of Recently Issued NRC Information Notices
.                                                            Attachment 
                                                            IN 89-20
                                                            February 24, 1989
                                                            Page 1 of 1

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

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

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

89-12          Dose Calibrator Quality       2/9/89         All NRC medical
               Control                                      licensees.
OL = Operating License
CP = Construction Permit 

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