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UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF NUCLEAR REACTOR REGULATION WASHINGTON, D.C. 20555 February 24, 1989 Information Notice No. 89-20: WELD FAILURES IN A PUMP OF BYRON-JACKSON DESIGN Addressees: All holders of operating licenses or construction permits for nuclear power reactors. Purpose: 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. 8902170112 . 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 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 89-12 Dose Calibrator Quality 2/9/89 All NRC medical Control licensees. _____________________________________________________________________________ OL = Operating License CP = Construction Permit ..
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