Browse wiki
Jump to navigation
Jump to search
Material accumulation discovered in a 55-g … 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.</br>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.</br>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. </br>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. </br>Cylinder re-certification was not in operation at the time of discovery.</br>NCS formally notified Operations not to operate cylinder re-certification.</br>The drum was removed from the system and inspected.</br>The material was removed from the drum, sampled, and analyzed. </br>This particular system was not previously analyzed for criticality safety.</br>Much less than a critical mass was involved.</br>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.</br>The Incident Review Committee (IRC) has determined that this is a safety significant incident in accordance with governing procedures.</br>A causal analysis will be performed.ures.
A causal analysis will be performed.
22:00:00, 4 June 2004 +
40,793 +
20:14:00, 4 June 2004 +
22:00:00, 4 June 2004 +
Material accumulation discovered in a 55-g … 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.</br>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.</br>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. </br>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. </br>Cylinder re-certification was not in operation at the time of discovery.</br>NCS formally notified Operations not to operate cylinder re-certification.</br>The drum was removed from the system and inspected.</br>The material was removed from the drum, sampled, and analyzed. </br>This particular system was not previously analyzed for criticality safety.</br>Much less than a critical mass was involved.</br>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.</br>The Incident Review Committee (IRC) has determined that this is a safety significant incident in accordance with governing procedures.</br>A causal analysis will be performed.ures.
A causal analysis will be performed.
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
00:00:00, 4 June 2004 +
SNM-1107 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
23:41:09, 24 November 2018 +
20:14:00, 4 June 2004 +
-0.0738 d (-1.77 hours, -0.0105 weeks, -0.00242 months) +
22:00:00, 4 June 2004 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.