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ACCESSION #: 9807010116 DISCLAIMER FOR SCANNED DOCUMENTS THIS ASCII TEXT DOCUMENT WAS PRODUCED FROM A PAPER COPY THAT WAS ELECTRONICALLY SCANNED AND CONVERTED INTO ASCII TEXT FORMAT. SOME TABLES, FIGURES AND MISCELLANEOUS DATA (SUCH AS SCIENTIFIC NOTATIONS/FORMULAS) MAY HAVE BEEN OMITTED DUE TO ASCII TEXT LIMITATIONS. AN IMAGE OF THE OFFICIAL RECORD COPY OF THIS TEXT FILE DOCUMENT IS AVAILABLE ON NUDOCS MICROFICHE. Coltec Industries Fairbanks Morse Engine Division 701 White Avenue Beloit, WI 53511-5492 www.fairbanksmorse.com INTERIM LETTER 608/364-4411 Fax: 608/364-0382 SUPPLEMENT NO.: 97-002-04 To: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC. 20555 From: Coltec Industries - Fairbanks Morse Engine Division (FMED) Date: 24 June 1998 Subject: Weldments on Opposed Piston and Coltec-Pie(stick Emergency Stand-By Diesel Gen-Set Lube-Oil and Jacket Water Piping Systems This is a supplement to the Interim Letter dated September 30, 1997, and to previous supplements 97-00201, 97-002-02, and 97-002-003 dated December 18, 1997, March 3, 1998, and April 29, 1998 respectively. It is intended to inform the U.S. Nuclear Regulatory Commission, and the affected nuclear utilities on the progress of the root cause investigation, and corrective/preventative actions associated with the Coltec-FMED Part 21 File No. 97-002. Supplement 97-002-03 previously stated that the initial conclusion is the weld joints were of adequate strength for the application based on tensile tests. In addition, Supplement 97-002-03 stated that the metallurgical examination of the weld joints and review of the customer contract requirements would be completed at the end of May 1998. However, due to limited engineering resources, only the review of customer contract requirements and metallurgical examination of the weld joints have been completed at this time. The engineering analysis of the metallurgical examination is in progress, and will be completed by August 14, 1998. At the completion of this item, the final notification will be submitted. The completed macro and microstructure examination included removing three samples from each weld. Photomacrographs were taken to depict the transverse view of the weld at each location. Photomicrographs were taken to depict the absence of crack propagation at the weld root and to exhibit general structure. The microstructure samples served to determine the depth of weld penetration. The results of the examination will be used by engineering for analysis. In addition, review of customer contract requirements has been completed. All customer contract requirements were satisfied. However, the requirements of the weld procedures used by Coltec were not satisfied. Immediate action taken included correcting any in process welds and briefing weld personnel on proper weld joint design. Actions to preclude recurrence includes formal training for all weld personnel on weld joint design, designation, and interpretation, which is being tracked by Corrective Action Request 1750. Previously submitted with Supplement 97-002-03 was a copy of Appendix E-1 describing the results of the tensile test. Appendix E-2 will contain the results of the metallurgical examination and photographs of the weld joints when completed. Appendix C exhibits photos of the sections of the section of the piping as received. Appendix D exhibits photos of the test section after completion of the burst testing. These three appendices (C, D, and E-2) are not included in this supplement. They will be included the final notification. Sincerely, James C. Golding Senior Quality Assurance Engineer Paul Danyluk Vice President, Engineering Cc: M. Armfield T. Gill B. Hall A division of Coltec, Industries Inc *** END OF DOCUMENT ***