Part 21 Report - 1995-022
ACCESSION #: 9501270185 Fax Sent via FaxWorks OS/2 To: Document Control Desk U.S. Nuclear Regulatory Commission From: Robert M. Schroeder Dow Corning Corporation 517/496-8330 (voice) 517/496-5849 (fax) 2 pages (including this cover sheet) Sent on 24-Jan-95 at 11:57 Comment: The following letter was sent to our customers today DOW CORNING January 23, 1995 By FAX RE: Update on SYLGARD (Registered Trademark) 170 Silicone Elastomer, SYLGARD (Registered Trademark) 170 Silicone Fast Cure Elastomer, and DOW CORNING (Registered Trademark) 96-081 RTV Adhesive/Sealant Dear Sir or Madam: Dow Corning made the following progress since our last communication to you on 1/6/95: DOW CORNING (Registered Trademark) 96-081 RTV Adhesive/Sealant Dow Corning has completed trial runs of DOW CORNING (Registered Trademark) 96-081 RTV Adhesive/Sealant incorporating the higher purity grade pigment. Lot acceptance testing confirmed that the material produced with the higher purity grade pigment meets all of our sales specifications. Therefore, we are once again capable of supplying DOW CORNING (Registered Trademark) 96-081 RTV Adhesive/Sealant which meets all of our sales specifications. Material should be available no later than the end of February. Underwriters Laboratories Dow Corning has met with Underwriters Laboratories and identified appropriate fire performance tests to evaluate the SYLGARD (Registered Trademark) 170 Silicone Elastomer, SYLGARD (Registered Trademark) 170 Silicone Fast Cure Elastomer, and DOW CORNING (Registered Trademark) 96-081 RTV Adhesive/Sealant in question. Testing will be completed in mid May. A final report documenting the test results will be issued by the end of May. Our next update will occur no later than April 7, 1995 to provide a progress report on testing. If you have questions, please contact me on our Information Line for this matter (517) 496-8777. Robert M. Schroeder Fire Protection Engineer RMS:jml cc: NRC DOW CORNING CORPORATION, MIDLAND, MICHIGAN 48686-0995 TELEPHONE: (517) 496-4000 GENERAL INFORMATION or OTHER EVENT NUMBER: 28079 LICENSEE: DOW CORNING CORPORATION NOTIFICATION DATE: 11/28/94 CITY: MIDLAND REGION: 3 NOTIFICATION TIME: 17:26 [ET] COUNTY: STATE: MI EVENT DATE: 11/28/94 LICENSE#: AGREEMENT: N EVENT TIME: 12:00 [EST] DOCKET: LAST UPDATE DATE: 01/24/95 NOTIFICATIONS NRC NOTIFIED BY: FACSIMILE HQ OPS OFFICER: WILLIAM HUFFMAN EMERGENCY CLASS: NOT APPLICABLE 10 CFR SECTION: CCCC 21.21 UNSPECIFIED PARAGRAPH EVENT TEXT PROBLEM WITH DOW CORNING SUPPLIED SILICONE ELASTOMERS. DOW CORNING OF MIDLAND, MICHIGAN, NOTIFIED THEIR CUSTOMERS (SUPPLIERS TO NUCLEAR UTILITIES) OF A PROBLEM WITH CERTAIN SILICONE ELASTOMERS. THE ELASTOMERS HAVE EXPERIENCED DEVIATIONS IN THE SPECIFIED CURE RATES. IT IS NOT YET KNOWN IF THE DEVIATIONS AFFECT THE CURED PROPERTIES OF THESE MATERIALS OR COULD CREATE A SAFETY HAZARD FOR THEIR NUCLEAR APPLICATIONS. THE PRECISE USAGE OF THESE ELASTOMERS WITHIN THE NUCLEAR INDUSTRY WAS NOT PROVIDED, BUT APPLICATIONS APPARENTLY INCLUDE FIRE PROTECTION FUNCTIONS. THE ELASTOMERS INVOLVED ARE IN THE SYLGARD 170 PRODUCT LINE. A RECENT PART 21 REPORT ON DOW RTV ADHESIVE DEVIATIONS APPEARS TO BE RELATED TO THIS PROBLEM (SEE EVENTS #28042 & 28161). A COPY OF THIS REPORT HAS BEEN SENT TO NRR/TQMB (HAASS). ****UPDATE 01/24/95 1205ET BY ROBERT M. SCHROEDER TAKEN BY MACKINNON**** PROGRESS SINCE LAST COMMUNICATION ON SILICONE ELASTOMERS ISSUE. THE FOLLOWING TEXT IS FROM A FACSIMILE RECEIVED DOW CORNING CORP., MIDLAND, MI. "DOW CORNING 96-081 RTV ADHESIVE/SEALANT DOW CORNING HAS COMPLETED TRIAL RUNS OF DOW CORNING 96-081 RTV ADHESIVE/SEALANT INCORPORATING THE HIGHER PURITY GRADE PIGMENT. LOT ACCEPTANCE TESTING CONFIRMED THAT THE MATERIAL PRODUCED WITH THE HIGHER PURITY GRADE PIGMENT MEETS ALL OF OUR SALES SPECIFICATIONS. THEREFORE, WE ARE ONCE AGAIN CAPABLE OF SUPPLYING DOW (Continued on next page) LICENSEE: DOW CORNING CORPORAT PAGE # 2 OF EVENT NUMBER: 28079 CORNING 96-081 RTV ADHESIVE/SEALANT WHICH MEETS ALL OF OUR SALES SPECIFICATIONS. MATERIALS SHOULD BE AVAILABLE MO LATER THAN THE END OF FEBRUARY. UNDERWRITERS LABORATORIES DOW CORNING HAS MET WITH UNDERWRITERS LABORATORIES AND IDENTIFIED APPROPRIATE FIRE PERFORMANCE TESTS TO EVALUATE THE SYLGARD 170 SILICONE ELASTOMER, SYLGARD 170 SILICONE FAST CURE ELASTOMER, AND DOW CORNING 96-081 RTV ADHESIVE/SEALANT IN QUESTION. TESTING WILL BE COMPLETE IN MID MAY. A FINAL REPORT DOCUMENTING THE TEST RESULTS WILL BE ISSUED BY ISSUED BY THE END OF MAY. OUR NEXT UPDATE WILL OCCUR NO LATER THAN APRIL 7, 1995 TO PROVIDE A PROGRESS REPORT ON TESTING. IF YOU HAVE QUESTIONS, PLEASE CONTACT ME ON OUR INFORMATION LINE FOR THIS MATER." A COPY OF THIS PART 21 UPDATE HAS BEEN FAXED TO WALTER HAASS OF NRR/TQMB. *** END OF DOCUMENT ***
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