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It was reported to (the licensee's Environ … It was reported to (the licensee's Environmental Health and Safety organization) on Oct 7, 2011 that the measurements on the 1.5 gallon pails used in the facility were found to be non-compliant with the governing Criticality Safety Evaluation, CSE-16-K Rev. 3, 'Common Containers.' This CSE authorized the deployment of 1.5-gal steel pails for miscellaneous use with SNM-bearing liquids. The safety basis for the design of these pails is addressed in credible scenario 4.1.4 in CSE-16-K. The primary contingency is passive engineered control FLOOR-115 which specifies the following dimensional requirements for the pails:</br>Top ID : 8.059 to 8.559</br>Bottom ID: less than or equal to 6.309</br>Inner Height: less than or equal to 8.217</br>Wall Thickness No Limit</br>The controls, PROCUR-901 and -902, cover the ordering and inspection upon receipt for the pails, to meet the criteria of FLOOR-114. In June 2011 all of the pails were inspected by the Product Assurance (PA) department and judged to meet the dimensional requirements. The pails were then deployed to the floor and have been in use since then.</br>On October 7, 2011, NCS Engineering was informed that the PA department had determined that their measurement methodology for the pails was incorrect. As a result, the actual top ID of the pail exceeded the IROFS limit by a margin of (approximately) 0.25 (inch). This results in the facility being in a state that is different from that analyzed in the Integrated Safety Analysis (i.e. the governing CSE). All other dimensions specified by the control FLOOR-115 are met, but the diameter aberration appears to affect all pails. As a result, the passive engineered IROFS FLOOR-115 is judged to have failed, eliminating the primary contingency.</br>Calculation results modeling an infinite array of in tolerance pails containing oil-moderated UO2 with 6 (inch) S/S spacing for this condition results in a 95/95 Keff of 0.8569. Preliminary calculation results with the increased diameter case results in a 95/95 Keff of 0.8610. Therefore, with the proper spacing maintained (12 (inch) per control FLOOR-116), with no stacking (control FLOOR-104), an infinite array of the as-built pails would not exceed the SNM-1107 license 0.95 criterion.</br>This event is being reported pursuant to the reporting requirements of 10CFR70 Appendix A (b)(1) within 24 hours of discovery due to the facility being in a state that is different from that analyzed in the Integrated Safety Analysis (i.e. the governing CSE). The performance requirements for this accident sequence require the Overall Likelihood Index (OLI) be Highly Unlikely. With this failure the sequence is Unlikely.</br>Immediate Corrective Actions:</br>-- Upon identification of the issue operations staff removed the pails from the main process areas and segregated to prevent use.</br>-- The event is being entered into the Corrective Action Process and a casual analysis initiated.</br>The Columbia Fuel Fabrication Facility is subject to Subpart H of 10 CFR 70 and this issue is addressed in the corresponding Integrated Safety Analysis.</br>The licensee will notify NRC Region 2 and state authorities.notify NRC Region 2 and state authorities.
20:15:00, 7 October 2011 +
47,330 +
17:23:00, 7 October 2011 +
20:15:00, 7 October 2011 +
It was reported to (the licensee's Environ … It was reported to (the licensee's Environmental Health and Safety organization) on Oct 7, 2011 that the measurements on the 1.5 gallon pails used in the facility were found to be non-compliant with the governing Criticality Safety Evaluation, CSE-16-K Rev. 3, 'Common Containers.' This CSE authorized the deployment of 1.5-gal steel pails for miscellaneous use with SNM-bearing liquids. The safety basis for the design of these pails is addressed in credible scenario 4.1.4 in CSE-16-K. The primary contingency is passive engineered control FLOOR-115 which specifies the following dimensional requirements for the pails:</br>Top ID : 8.059 to 8.559</br>Bottom ID: less than or equal to 6.309</br>Inner Height: less than or equal to 8.217</br>Wall Thickness No Limit</br>The controls, PROCUR-901 and -902, cover the ordering and inspection upon receipt for the pails, to meet the criteria of FLOOR-114. In June 2011 all of the pails were inspected by the Product Assurance (PA) department and judged to meet the dimensional requirements. The pails were then deployed to the floor and have been in use since then.</br>On October 7, 2011, NCS Engineering was informed that the PA department had determined that their measurement methodology for the pails was incorrect. As a result, the actual top ID of the pail exceeded the IROFS limit by a margin of (approximately) 0.25 (inch). This results in the facility being in a state that is different from that analyzed in the Integrated Safety Analysis (i.e. the governing CSE). All other dimensions specified by the control FLOOR-115 are met, but the diameter aberration appears to affect all pails. As a result, the passive engineered IROFS FLOOR-115 is judged to have failed, eliminating the primary contingency.</br>Calculation results modeling an infinite array of in tolerance pails containing oil-moderated UO2 with 6 (inch) S/S spacing for this condition results in a 95/95 Keff of 0.8569. Preliminary calculation results with the increased diameter case results in a 95/95 Keff of 0.8610. Therefore, with the proper spacing maintained (12 (inch) per control FLOOR-116), with no stacking (control FLOOR-104), an infinite array of the as-built pails would not exceed the SNM-1107 license 0.95 criterion.</br>This event is being reported pursuant to the reporting requirements of 10CFR70 Appendix A (b)(1) within 24 hours of discovery due to the facility being in a state that is different from that analyzed in the Integrated Safety Analysis (i.e. the governing CSE). The performance requirements for this accident sequence require the Overall Likelihood Index (OLI) be Highly Unlikely. With this failure the sequence is Unlikely.</br>Immediate Corrective Actions:</br>-- Upon identification of the issue operations staff removed the pails from the main process areas and segregated to prevent use.</br>-- The event is being entered into the Corrective Action Process and a casual analysis initiated.</br>The Columbia Fuel Fabrication Facility is subject to Subpart H of 10 CFR 70 and this issue is addressed in the corresponding Integrated Safety Analysis.</br>The licensee will notify NRC Region 2 and state authorities.notify NRC Region 2 and state authorities.
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00:00:00, 7 October 2011 +
SNM-1107 +
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20:15:00, 7 October 2011 +
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