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You searched for +publisher:"University of New Mexico" +contributor:("Arthur, Edward"). Showing records 1 – 3 of 3 total matches.

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University of New Mexico

1. Lafreniere, Philip. IDENTIFICATION OF ELECTROREFINER AND CATHODE PROCESSING FAILURE MODES AND DETERMINATION OF SIGNATURE-SIGNIFICANCE FOR INTEGRATION INTO A SIGNATURE BASED SAFEGUARDS FRAMEWORK FOR PYROPROCESSING.

Degree: Nuclear Engineering, 2015, University of New Mexico

The traditional method of safeguarding nuclear facilities, nuclear material accountancy (NMA), faces many challenges when applied to pyroprocessing facilities. To aid in the safeguarding of these facilities, process monitoring (PM) is being investigated as a complementary method to NMA. PM takes general process data, such as density, current etc., and applies it to safeguards through the use of a statistical framework. Signature Based Safeguards (SBS), a proposed statistical framework for the application of PM techniques, identifies anomalous scenarios and subsequently identifies and detects their respective PM signatures from a system of sensors. This work focuses both on assisting SBS through identifying anomalous scenarios, and on the computer modeling of these failure modes and the PM signatures for them. The anomalous scenarios investigated were mechanical failure modes with potential safeguards-significance as they could lead to the deposition of plutonium and other actinides in the final uranium product ingot. The signatures of these anomalous scenarios were primarily radiation signatures from a coincidence counter that is used to analyze the final ingots. Several different failure modes were identified for both the electrorefiner and the cathode processor. The signatures for these failure modes were then determined by coupling two separate computer models. The first model is a FORTRAN-based electrorefiner code named ERAD capable of modeling the mass transport of metals within an electrorefiner. The second model was an MCNP-based simulation of the Canberra JCC-31 High Level Neutron Coincidence Counter. First, the identified failure modes were simulated by changing ERAD inputs. ERAD calculated an elemental mass composition at the cathode which was then used as the final ingot composition. The final ingot composition was analyzed for single and double neutron coincidence count rates using the MCNP model. The results demonstrate significant radiation signatures for the presence of plutonium as a result of the electrorefiner failure modes. Signatures from cathode processor failure modes were weak and thus warrant future investigation of better detectors for integration into a SBS framework. Advisors/Committee Members: Blandford, Edward, Arthur, Edward, Cipiti, Benjamin, Prinja, Anil.

Subjects/Keywords: Pyroprocessing; Signature Based Safeguards; Computer Modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lafreniere, P. (2015). IDENTIFICATION OF ELECTROREFINER AND CATHODE PROCESSING FAILURE MODES AND DETERMINATION OF SIGNATURE-SIGNIFICANCE FOR INTEGRATION INTO A SIGNATURE BASED SAFEGUARDS FRAMEWORK FOR PYROPROCESSING. (Masters Thesis). University of New Mexico. Retrieved from http://hdl.handle.net/1928/25757

Chicago Manual of Style (16th Edition):

Lafreniere, Philip. “IDENTIFICATION OF ELECTROREFINER AND CATHODE PROCESSING FAILURE MODES AND DETERMINATION OF SIGNATURE-SIGNIFICANCE FOR INTEGRATION INTO A SIGNATURE BASED SAFEGUARDS FRAMEWORK FOR PYROPROCESSING.” 2015. Masters Thesis, University of New Mexico. Accessed July 21, 2019. http://hdl.handle.net/1928/25757.

MLA Handbook (7th Edition):

Lafreniere, Philip. “IDENTIFICATION OF ELECTROREFINER AND CATHODE PROCESSING FAILURE MODES AND DETERMINATION OF SIGNATURE-SIGNIFICANCE FOR INTEGRATION INTO A SIGNATURE BASED SAFEGUARDS FRAMEWORK FOR PYROPROCESSING.” 2015. Web. 21 Jul 2019.

Vancouver:

Lafreniere P. IDENTIFICATION OF ELECTROREFINER AND CATHODE PROCESSING FAILURE MODES AND DETERMINATION OF SIGNATURE-SIGNIFICANCE FOR INTEGRATION INTO A SIGNATURE BASED SAFEGUARDS FRAMEWORK FOR PYROPROCESSING. [Internet] [Masters thesis]. University of New Mexico; 2015. [cited 2019 Jul 21]. Available from: http://hdl.handle.net/1928/25757.

Council of Science Editors:

Lafreniere P. IDENTIFICATION OF ELECTROREFINER AND CATHODE PROCESSING FAILURE MODES AND DETERMINATION OF SIGNATURE-SIGNIFICANCE FOR INTEGRATION INTO A SIGNATURE BASED SAFEGUARDS FRAMEWORK FOR PYROPROCESSING. [Masters Thesis]. University of New Mexico; 2015. Available from: http://hdl.handle.net/1928/25757


University of New Mexico

2. Keith, Rodney. Dual Neutral Particle Beam Interrogation of Intermodal Shipping Containers for Special Nuclear Material.

Degree: Nuclear Engineering, 2013, University of New Mexico

Intermodal shipping containers entering the United States provide an avenue to smuggle unsecured or stolen special nuclear material (SNM). The only direct method fielded to indicate the presence of SNM is by passive photon/neutron radiation detection. Active interrogation using neutral particle beams to induce fission in SNM is a method under consideration. One by-product of fission is the creation of fragments that undergo radioactive decay over a time period on the order of tens of seconds after the initial event. The delayed' gamma-rays emitted from these fragments over this period are considered a hallmark for the presence of SNM. A fundamental model is developed using homogenized cargos with a SNM target embedded at the center and computationally interrogated using simultaneous neutron and photon beams. Findings from analysis of the delayed gamma emissions from these experiments are intended to mitigate the effects of poor quality information about the composition and disposition of suspect cargo before examination in an active interrogation portal. Advisors/Committee Members: de Oliveira, Cassiano, Hecht, Adam, Arthur, Edward, Middleton, Bobby, Ross, Timothy.

Subjects/Keywords: active interrogation; neutral particle beam; intermodal container; special nuclear material

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Keith, R. (2013). Dual Neutral Particle Beam Interrogation of Intermodal Shipping Containers for Special Nuclear Material. (Doctoral Dissertation). University of New Mexico. Retrieved from http://hdl.handle.net/1928/23124

Chicago Manual of Style (16th Edition):

Keith, Rodney. “Dual Neutral Particle Beam Interrogation of Intermodal Shipping Containers for Special Nuclear Material.” 2013. Doctoral Dissertation, University of New Mexico. Accessed July 21, 2019. http://hdl.handle.net/1928/23124.

MLA Handbook (7th Edition):

Keith, Rodney. “Dual Neutral Particle Beam Interrogation of Intermodal Shipping Containers for Special Nuclear Material.” 2013. Web. 21 Jul 2019.

Vancouver:

Keith R. Dual Neutral Particle Beam Interrogation of Intermodal Shipping Containers for Special Nuclear Material. [Internet] [Doctoral dissertation]. University of New Mexico; 2013. [cited 2019 Jul 21]. Available from: http://hdl.handle.net/1928/23124.

Council of Science Editors:

Keith R. Dual Neutral Particle Beam Interrogation of Intermodal Shipping Containers for Special Nuclear Material. [Doctoral Dissertation]. University of New Mexico; 2013. Available from: http://hdl.handle.net/1928/23124


University of New Mexico

3. Martin, William. Dual neutral particle induced transmutation.

Degree: Nuclear Engineering, 2012, University of New Mexico

Although nuclear transmutation methods have been around for decades, they all focus solely on neutron induced reactions. Recent novel concepts have sought to use neutrons as well as photons for active interrogation of cargo to detect the smuggling of highly enriched uranium  – a concept that would require modeling of the transmutation caused by both neutrons and photons. As photonuclear transmutation has yet to be modeled, new methods need to be developed. The CINDER2008 nuclear transmutation code from Los Alamos National Laboratory is extended from neutron only applications to dual particle applications specifically for this modeling. To couple these calculations to a dual particle transport for the determination of reaction rates, both deterministic and Monte Carlo methods are used. By doing this through a single code, TINDER (Transport-coupled CINDER), transport and transmutation calculations can be completed with no human interaction after the start of the calculation, cutting down on the uncertainties and errors that come with human manipulation of data. A necessary verification and validation of these methods has taken place, especially in terms of the photonuclear data, which is sparse or non-existent in some cases. This has proven any data translations and uses are appropriate and correct and the code has been modified correctly. A final demonstration has been performed based on the intended use of this code, active interrogation of nuclear cargo. These results match to within a few percent of experimental data and the extension to dual particles can bolster the output signal by over 15%. As transport methods come at a cost, a sensitivity analysis has been performed to see the effect of variations in the flux on the final output. These results show that although the output beta-delayed photon spectrum is sensitive to the input flux, the results are still on the correct order for practical purposes. Advisors/Committee Members: De Oliveira, Cassiano, Arthur, Edward, Prinja, Anil, Coutsias, Evangelos, Hecht, Adam.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Martin, W. (2012). Dual neutral particle induced transmutation. (Doctoral Dissertation). University of New Mexico. Retrieved from http://hdl.handle.net/1928/20845

Chicago Manual of Style (16th Edition):

Martin, William. “Dual neutral particle induced transmutation.” 2012. Doctoral Dissertation, University of New Mexico. Accessed July 21, 2019. http://hdl.handle.net/1928/20845.

MLA Handbook (7th Edition):

Martin, William. “Dual neutral particle induced transmutation.” 2012. Web. 21 Jul 2019.

Vancouver:

Martin W. Dual neutral particle induced transmutation. [Internet] [Doctoral dissertation]. University of New Mexico; 2012. [cited 2019 Jul 21]. Available from: http://hdl.handle.net/1928/20845.

Council of Science Editors:

Martin W. Dual neutral particle induced transmutation. [Doctoral Dissertation]. University of New Mexico; 2012. Available from: http://hdl.handle.net/1928/20845

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