ENS 40793: Difference between revisions

v t e ENS Event
22:00 Jun 4, 2004
Title	Licensee Reported a 4 Hour 91-01 Response Bulletin
Event Description	Material accumulation discovered in a 55-gallon drum. The 55-gallon drum was used as a knock-out pot for moisture condensate during high-pressure nitrogen drying of clean UF6 cylinders undergoing re-certification. In accordance with Westinghouse Operating License (SNM-1107), paragraph 3.7.3 (b.2), this event satisfies the criteria for a 4-hour notification. Specifically, any determination that a criticality safety analysis or evaluation was deficient, or that a particular system was not previously analyzed; and that less than two unlikely, independent, and concurrent changes in process conditions would be required before a criticality accident would be possible. During a normal process hazards assessment an NCS Engineer was informed of a 55-gallon drum in the cylinder re-certification process. The drum was found to contain approximately 28 kilograms of dry material. Laboratory analyses determined a maximum concentration of 53.5 weight percent uranium in the form of uranyl fluoride. This corresponds to a uranium mass of approximately 15 kilograms. UF6 cylinders contain virtually no uranium at the time they undergo drying in the cylinder re-certification process. Preliminary investigation has revealed that the drum was inspected from 1993 to 1996 and repeatedly found to contain no solid accumulation before the inspections were discontinued. Cylinder re-certification was not in operation at the time of discovery. NCS formally notified Operations not to operate cylinder re-certification. The drum was removed from the system and inspected. The material was removed from the drum, sampled, and analyzed. This particular system was not previously analyzed for criticality safety. Much less than a critical mass was involved. At no time was the health or safety to any employee or member of the public in jeopardy. No exposure to hazardous material was involved. The Incident Review Committee (IRC) has determined that this is a safety significant incident in accordance with governing procedures. A causal analysis will be performed.

ENS 40793 +/-
Where
Westinghouse Electric Corporation Columbia, South Carolina (NRC Region 2)
License number:	SNM-1107
Reporting

Response
Time - Person (Reporting Time:+-1.77 h-0.0738 days <br />-0.0105 weeks <br />-0.00242 months <br />)
Opened:	Owen Connelly 20:14 Jun 4, 2004
NRC Officer:	Chauncey Gould
Last Updated:	Jun 4, 2004
40793 - NRC Website
v • d • e

v t e Emergency Notification System
Westinghouse Electric Corporation with Response
WEEKMONTHYEAR2005-08-19T19:30:00 [Table view]
[ENS list for Westinghouse Electric Corporation]

@@ Line 3: / Line 3: @@
 | facility = Westinghouse Electric Corporation
 | Organization =
-| license number = Snm-1107
+| license number = SNM-1107
 | region = 2
 | state = South Carolina

ENS 40793: Difference between revisions

Latest revision as of 19:41, 24 November 2018

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ENS 40793: Difference between revisions

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