ENS 41723: Difference between revisions

v t e ENS Event
22:40 May 20, 2005
Title	Deviation from Integrated Safety Analysis, and a 24 Hour Notification - Bulletin 91-01 Criticality Control
Event Description	Facility Westinghouse Electric Company, Commercial Fuel Fabrication Facility, Columbia, SC, low enriched PWR fuel fabricator for commercial light water reactors. Time and Date of Event May 20, 2005, 1840 hours0.0213 days <br />0.511 hours <br />0.00304 weeks <br />7.0012e-4 months <br />. Reason for Notification During a routine filter change-out in a HVAC recirculation filter housing, maintenance mechanics detected an excessive amount of material buildup on the filters and contacted the ventilation engineer. Human performance training at the plant has engendered a heightened awareness for process upsets or unusual conditions in all plant personnel. The ventilation engineer examined the filter housing beneath the filter array and discovered a minor build up of powder in the corners of the housing. This caused him to contact the Nuclear Criticality Safety function. The ventilation engineer and the NCS engineer had samples pulled from the powder and filters to confirm the absence of uranium. The system was believed to serve hoods where entrainment of uranium was not credible, i.e. hoods that contained only sintered pellets, not powder in any form. The samples from the filters returned results in a range from 3.5 to 50 weight percent uranium (average 19 weight percent). This notification [Deviation from Integrated Safety Analysis] is made in accordance with Appendix A [(b)(5)(i)] to Part 70 - Reportable Safety Events. Events to be reported to the NRC Operations Center, (b) within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of discovery, (5) An occurrence of an event or process deviation that was considered in the Integrated Safety Analysis and : (i) Was dismissed due to its likelihood. As Found Condition The samples from the filters returned results in a range from 3.5 to 50 weight percent uranium (average of all samples for filters was 19 weight percent). An approximate mass of material mass held up in the filters is 119 kg. Based on the average weight percent uranium, the mass of uranium held up in the filters was 22.6 kg, which is less than a critical mass for spherical fully reflected UO2 and water system. The system was already shut down for filter replacement. Summary of Activity The entire functional area that the system serves was shut down immediately. A team of process experts, system experts, NCS specialists, maintenance personnel, and management was immediately formed to determine the source of the uranium in the system. Conclusions 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 41723 +/-
Where
Westinghouse Electric Corporation Columbia, South Carolina (NRC Region 2)
License number:	SNM-1107
Reporting

Part 70 App A (B)(5) Response
Time - Person (Reporting Time:+19.98 h0.833 days <br />0.119 weeks <br />0.0274 months <br />)
Opened:	Owen Connelly 18:39 May 21, 2005
NRC Officer:	John Knoke
Last Updated:	May 21, 2005
41723 - NRC Website
v • d • e

v t e Emergency Notification System
Westinghouse Electric Corporation with Response, Part 70 App A (B)(5)
WEEKMONTHYEAR2005-08-19T19:30:00 [Table view]
[ENS list for Westinghouse Electric Corporation]

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 | facility = Westinghouse Electric Corporation
 | Organization =
-| license number = Snm-1107
+| license number = SNM-1107
 | region = 2
 | state = South Carolina

ENS 41723: Difference between revisions

Latest revision as of 18:38, 24 November 2018

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ENS 41723: Difference between revisions

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