Hazard Categorization Reduction via Nature of the Process Argument

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This paper documents the Hazard Categorization (HC) and Critical Safety Evaluation (CSE) for activities performed using an Inspection Object (IO) in excess of the single parameter subcritical limit of 700 g of U-235. By virtue of exceeding the single parameter subcritical limit and the subsequent potential for criticality, the IO HC is initially categorized as HC2. However, a novel application of the nature of the process argument was employed to reduce the IO HC from HC2 to less than HC3 (LTHC3). The IO is composed of five separate uranium metal plates that total no greater than 3.82 kg of U-235 ... continued below

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Graaff, Chelise A. Van De; Pope, Dr. Chad & Taylor, J. Todd May 1, 2012.

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Description

This paper documents the Hazard Categorization (HC) and Critical Safety Evaluation (CSE) for activities performed using an Inspection Object (IO) in excess of the single parameter subcritical limit of 700 g of U-235. By virtue of exceeding the single parameter subcritical limit and the subsequent potential for criticality, the IO HC is initially categorized as HC2. However, a novel application of the nature of the process argument was employed to reduce the IO HC from HC2 to less than HC3 (LTHC3). The IO is composed of five separate uranium metal plates that total no greater than 3.82 kg of U-235 (U(20)). The IO is planned to be arranged in various configurations. As the IO serves as a standard for experimentation aimed at establishing techniques for detection of fissionable materials, it may be placed in close proximity to various reflectors, moderators, or both. The most reactive configurations of the IO were systematically evaluated and shown that despite the mass of U-235 and potential positioning near various reflectors and moderators, the IO cannot be assembled into a critical configuration. Therefore, the potential for criticality does not exist. With Department of Energy approval, a Hazards Assessment Document with high-level (facility-level) controls on the plates negates the potential for criticality and satisfies the nature of the process argument to reduce the HC from HC2 to LTHC3.

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  • 2012 EFCOG Safety Analysis Workshop,Santa Fe, NM,05/05/2012,05/10/2012

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  • Report No.: INL/CON-12-24467
  • Grant Number: DE-AC07-05ID14517
  • Office of Scientific & Technical Information Report Number: 1055957
  • Archival Resource Key: ark:/67531/metadc836200

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  • May 1, 2012

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  • May 19, 2016, 9:45 a.m.

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  • June 20, 2016, 1:58 p.m.

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Graaff, Chelise A. Van De; Pope, Dr. Chad & Taylor, J. Todd. Hazard Categorization Reduction via Nature of the Process Argument, article, May 1, 2012; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc836200/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.