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You searched for +publisher:"University of Notre Dame" +contributor:("David M. Bartels, Committee Member"). One record found.

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University of Notre Dame

1. Kyle Stewart Haygarth. Radiolysis Studies in Supercritical Water</h1>.

Degree: MS, Chemistry and Biochemistry, 2009, University of Notre Dame

This dissertation will consist of three topics which fall under the general umbrella of studies of water radiolysis at supercritical temperatures and pressures for nuclear power applications. Introductory material common to all chapters in this dissertation relating to water radiolysis in supercritical water conditions is presented in the opening chapter. Chapter 2 explores “The Application of Hydrogen Water Chemistry to Suppress Net Radiolysis in Supercritical Water.” One of the largest problems in all nuclear reactors (including the proposed Supercritical Water Reactor (SCWR) design) is stress corrosion cracking (SCC) of steel pipes. This is controlled by the corrosion potential, on which the O2 and H2O2 species formed in water radiolysis have a major impact.1,2 Even at low concentrations they strongly influence corrosion kinetics. In order to control the corrosion potential, a successful strategy employing hydrogen water chemistry inhibits radiolytic decomposition of the coolant by the minimum addition of hydrogen (the critical hydrogen concentration) to the primary cooling water.3 Experiments showing that this strategy can be successfully applied in supercritical water reactors are discussed. We have confirmed that suppression of O2 in the bulk water is possible in the sub-and supercritical temperature regimes. However, results indicate that substantial hydrogen (no O2) is still generated by radiation-induced reactions on the walls of the metal flow system, an effect absent at lower (sub 350ÌÄåâÌâå¡C) temperatures. In fact, excess hydrogen seems to be generated at supercritical temperatures. Chapter 3 explores “Solvated Electron (e-aq) Yields in Supercritical Water.” In support of an ongoing yield measurement program collaboration with the University of Wisconsin, Madison, radiolysis yields of H, H2, and e-aq were measured as a function of temperature and as a function of pressure (or density) in the mixed neutron/gamma radiation field from a nuclear reactor at the University of Wisconsin. Reactor data is compared with nearly identical experiments run with a 3MeV van de Graaff accelerator to measure the same yields in the absence of neutron radiolysis. Radiolysis was carried out using a beam of 2-3 MeV electrons from a van de Graaff accelerator and SF6 was used as a specific scavenger for the hydrated electron. Reduction of SF6 on the walls of the irradiation zone was apparent and subsequently investigated. Chapter 4 explores “Carbonate Radical Formation in Radiolysis of Sodium Carbonate and Bicarbonate Solutions up to 250ÌÄåâÌâå¡C and the Mechanism of its Second Order Decay.” Pulse radiolysis experiments published several years ago raised the possibility that the carbonate radical formed from reaction of ÌÄå¢Ì¢åâåÂÌâå¢OH radicals with either HCO3- or CO32- might actually exist predominantly as a dimer form, e.g. ÌÄå¢Ì¢åâåÂÌâå¢(CO3)23-. In this work we re-examine the data upon which this suggestion was based, and find that the original data analysis is flawed. Upon re-analysis of the published data for sodium… Advisors/Committee Members: Ian Carmichael, Committee Member, David M. Bartels, Committee Member.

Subjects/Keywords: hydrogen water chemistry; stress corrosion cracking; corrosion

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APA (6th Edition):

Haygarth, K. S. (2009). Radiolysis Studies in Supercritical Water</h1>. (Masters Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/df65v69500q

Chicago Manual of Style (16th Edition):

Haygarth, Kyle Stewart. “Radiolysis Studies in Supercritical Water</h1>.” 2009. Masters Thesis, University of Notre Dame. Accessed June 25, 2019. https://curate.nd.edu/show/df65v69500q.

MLA Handbook (7th Edition):

Haygarth, Kyle Stewart. “Radiolysis Studies in Supercritical Water</h1>.” 2009. Web. 25 Jun 2019.

Vancouver:

Haygarth KS. Radiolysis Studies in Supercritical Water</h1>. [Internet] [Masters thesis]. University of Notre Dame; 2009. [cited 2019 Jun 25]. Available from: https://curate.nd.edu/show/df65v69500q.

Council of Science Editors:

Haygarth KS. Radiolysis Studies in Supercritical Water</h1>. [Masters Thesis]. University of Notre Dame; 2009. Available from: https://curate.nd.edu/show/df65v69500q

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