ENS 43983

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v t e ENS Event
14:30 Feb 13, 2008
Title	24 Hour Report Concerning Improperly Analyzed Condition Related to Integrated Safety Analysis
Event Description	{{#Wiki_filter:During a routine internal audit of the Uranium Recovery 3-inch Extraction System on February 13 at 0930, a Nuclear Criticality Safety (NCS) engineer observed several inconsistencies between the documented limits and controls in the Integrated Safety Analysis summary and those derived in the associated NCS evaluations. These anomalies were non-conservative in nature and included items such as the inside diameters of the columns, column wall thickness, and limits on the number of stainless steel columns in the system. In addition, the most recent NCS evaluation of the system employed a different analytical methodology than earlier evaluations. The evaluation employed the solid angle methodology, which had not been previously utilized to evaluate the 3-inch Extraction System. In past evaluations, the system was modeled using the law of substitution as a 7 x 2 array of 4-inch columns, mirrored in the x and y faces to form an infinite planar array. This change in methodology was incorrect. Based on these uncertainties in the safety basis, the engineer was unable to determine if double contingency was maintained. An evaluation is currently being performed. BWXT is making this 24-hour report in accordance with 10 CFR 70.61, Appendix A, (b)(1) - Any event or condition that results in the facility being in a state that was not analyzed, was improperly analyzed, or is different from that analyzed in the Integrated Safety Analysis, and which results in failure to meet the performance requirements of � 70.61. The operation was immediately shutdown by Nuclear Criticality Safety pending further investigation. The licensee notified the NRC Resident Inspector. }}

ENS 43983 +/-
Where
Bwx Technologies, Inc. Lynchburg, Virginia (NRC Region 2)
License number:	SNM-42
Reporting

Part 70 App A (B)(1)
Time - Person (Reporting Time:+2.52 h0.105 days <br />0.015 weeks <br />0.00345 months <br />)
Opened:	Cheryl Goff 17:01 Feb 13, 2008
NRC Officer:	Bill Huffman
Last Updated:	Feb 13, 2008
43983 - NRC Website
v • d • e

v t e Emergency Notification System
Bwx Technologies, Inc. with Part 70 App A (B)(1)
WEEKMONTHYEAR2018-09-17T04:00:00 [Table view]
[ENS list for Bwx Technologies, Inc.]

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ENS Notification