A Criticality Safety Study on Storing Unirradiated Cintichem-Type Targets at Sandia National Laboratories

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Description

This criticality safety analysis is performed to determine the effective multiplication factor (k{sub eff}) for a storage cabinet filled with unirradiated Cintichem-type targets. These targets will be used to produce {sup 99}Mo at Sandia National Laboratories and will be stored on-site prior to irradiation in the Annular Core Research Reactor. The analysis consisted of using the Monte Carlo code MCNP (Version 4A) to model and predict the k{sub eff} for the proposed dry storage configuration under credible loss of geometry and moderator control. Effects of target pitch, non-uniform loading, and target internal/external flooding are evaluated. Further studies were done with ... continued below

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37 p.

Creation Information

Romero, D.J.; Parma, E.J. & Busch, R.D. April 21, 1999.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA
    Place of Publication: Albuquerque, New Mexico

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Description

This criticality safety analysis is performed to determine the effective multiplication factor (k{sub eff}) for a storage cabinet filled with unirradiated Cintichem-type targets. These targets will be used to produce {sup 99}Mo at Sandia National Laboratories and will be stored on-site prior to irradiation in the Annular Core Research Reactor. The analysis consisted of using the Monte Carlo code MCNP (Version 4A) to model and predict the k{sub eff} for the proposed dry storage configuration under credible loss of geometry and moderator control. Effects of target pitch, non-uniform loading, and target internal/external flooding are evaluated. Further studies were done with deterministic methods to verify the results obtained from MCNP and to obtain a clearer understanding of the parameters affecting system criticality. The diffusion accelerated neutral particle transport code ONEDANT was used to model the target in a one-dimensional, infinite half-slab geometry and determine the critical slab thickness. Hand calculations were also completed to determine the critical slab thickness with modified one-group, and one-group, two region approximations. Results obtained from ONEDANT and the hand calculations were compared to applicable cases in a commonly used criticality safety analysis handbook. Overall, the critical slab thicknesses obtained in the deterministic analysis were much larger than the dimensions of the cabinet and further support the predictions by MCNP that a critical system cannot be attained for the base case or in conditions where loss of geometry and moderation control occur.

Physical Description

37 p.

Notes

INIS; OSTI as DE00005903

Medium: P; Size: 37 pages

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  • Journal Name: Nuclear Technology; Other Information: Submitted to Nuclear Technology

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  • Report No.: SAND99-0993J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 5903
  • Archival Resource Key: ark:/67531/metadc689834

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  • April 21, 1999

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 12, 2017, 2:21 p.m.

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Romero, D.J.; Parma, E.J. & Busch, R.D. A Criticality Safety Study on Storing Unirradiated Cintichem-Type Targets at Sandia National Laboratories, article, April 21, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc689834/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.