Part 21 Report - 1997-240

LICENSEE: UNITED STATES ENRICHMENT CORPORATIO SITE: PADUCAH GASEOUS DIFFUSION PLAN EN NUMBER:31954 DOCKET: 0707001 EVENT DATE: 03-14-97 RX TYPE: EVENT TIME: 00:00 VENDORS: NOTIFY DATE: 03-14-97 EMERGENCY CLASS: N/A REGION: 3 STATE: KY TIME: 13:30 OPS OFFICER: STEVE SANDIN 10 CFR SECTION: CDEG 21.21(c)(3)(i) DEFECTS/NONCOMPLIANCE 10 CFR PART 21 NOTIFICATION REGARDING STRESS CORROSION CRACKING OF CYLINDER VALVE PACKING NUTS IT HAS BEEN DETERMINED THAT STRESS CORROSION CRACKING OF THE 1-INCH CYLINDER VALVE PACKING NUTS USED IN VARIOUS STAGES OF THE ENRICHMENT PROCESS HAS, IN ONE CASE, RESULTED IN A REPORTABLE RELEASE OF UF6. THIS PROBLEM HAS ONLY BEEN OBSERVED IN THE 636-ALLOY NUTS ON VALVES SUPPLIED BY HUNT VALVE CO., INC. * * * UPDATE 1740EDT 4/11/97 FROM MARK LOMBARD TO S. SANDIN * * * THE LICENSEE SUBMITTED AN UPDATE VIA FAX. NOTIFIED R3DO(MADERA) AND FORWARDED TO NMSS(RAMSEY).

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