ENS 40985: Difference between revisions

v t e ENS Event
14:05 Aug 24, 2004
Title	24 Hour 91-01 Response Bulletin
Event Description	An incorrect valve line-up caused a batch from the solvent extraction system to be pumped to the uranyl nitrate bulk storage tank without having the necessary sample results for grams U-235 per liter, percent free acid, and pH. It was determined that approximately 38 gallons of uranyl nitrate at 4.6 grams U-235, 8 percent free acid, and a pH of 1 was pumped to the bulk storage tank. These parameters meet the requirements for an authorized pumpout. The bulk storage tank contained approximately 1600 gallons of uranyl nitrate at approximately 1.4 grams U-235 per liter, 11.6 percent free acid, and a pH of 1. Double contingency protection for the bulk storage tank is based on concentration control. Concentration control is based upon maintaining uranyl nitrate that is pumped to the tanks at less than 5 grams U-235/liter. The pH is maintained at a value of less than 2 to ensure that the uranyl nitrate stays in solution. The percent free acid is maintained at greater than 4 percent to ensure that the uranyl nitrate stays in solution and depresses the freezing temperature of the solution to prevent concentration by freezing. It has been determined that less than previously documented double contingency protection remained for the system and that greater than a safe mass was involved, but a sufficient number of controls that were lost were restored within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. In accordance with Westinghouse Operating License (SNM-1107), paragraph 3.7.3 (c.5b), this event satisfies the criteria for a 24-hour notification. Summary of Activity All pumpouts to bulk storage tanks were stopped immediately upon recognition. This action was initiated by operators monitoring system performance. Samples for grams U-235/liter, pH, and %free acid were taken to ensure the tanks were in specification. Before the end of the shift, sample results for grams U-235/liter, pH, and %free acid were confirmed to be acceptable. At the beginning of each shift, operators are being informed of the incident. The procedure is being modified immediately to incorporate an additional peer check. Independent locks will be installed to require separate individuals to unlock the valve prior to pumpout. Conclusions Loss of double contingency protection occurred. 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) determined that this is a safety significant incident in accordance with governing procedures. Notification was the result of an event, not a deficient NCS analysis. A causal analysis will be performed.

ENS 40985 +/-
Where
Westinghouse Electric Corporation Columbia, South Carolina (NRC Region 2)
License number:	SNM-1107
Reporting

Response
Time - Person (Reporting Time:+19.65 h0.819 days <br />0.117 weeks <br />0.0269 months <br />)
Opened:	Carl Snyder 09:44 Aug 25, 2004
NRC Officer:	Chauncey Gould
Last Updated:	Aug 25, 2004
40985 - 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 40985: Difference between revisions

Latest revision as of 19:40, 24 November 2018

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ENS 40985: Difference between revisions

Latest revision as of 19:40, 24 November 2018

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