{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/29727"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/29727","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Simulation of the CRUD formation process using the Lattice Boltzmann Method","abstract":"The Axial Offset Anomaly (AOA) is a major impediment to increases in reactor fuel performance preventing PWRs from operating with even more efficient core designs than they are at present. It is a phenomenon where boron compounds such as lithium metaborate LiBO$_2$ and nickel-boroferrite Ni$_2$FeBO$_5$ (known as mineral bonaccordite) concentrate and precipitate during reactor operation in corrosion products deposited on high-duty fuel assemblies at subcooled nucleate boiling conditions and cause the reactor neutron flux and core axial power distribution to deviate from the predicted distribution. The purpose of the present work is to describe the fundamentals in CRUD formation, transport, and deposition, in order to provide a theoretical basis for evaluating and analysing any fuel operational problem due to CRUD deposits. A Lattice Boltzmann Method model is proposed for simulating thermal hydraulic and chemical conditions in the coolant and the formation process of the CRUD. Simulation results show that existence of CRUD in the nuclear reactors, not surprisingly, leads to an increase in the clad temperature. Presence of CRUD also affects the temperature, molecule and ion concentrations, and electrical potential distribution in the coolant. This effect is especially strong near the CRUD surface. In addition, the results imply that the CRUD formation rate increases approximately linearly with the zeta potential (surface charge density), and Fe$^3+$ ion concentration.","abstract_html":"The Axial Offset Anomaly (AOA) is a major impediment to increases in reactor fuel performance preventing PWRs from operating with even more efficient core designs than they are at present. It is a phenomenon where boron compounds such as lithium metaborate LiBO<span class=\"etd-inline-math\"><sub>2</sub></span> and nickel-boroferrite Ni<span class=\"etd-inline-math\"><sub>2</sub></span>FeBO<span class=\"etd-inline-math\"><sub>5</sub></span> (known as mineral bonaccordite) concentrate and precipitate during reactor operation in corrosion products deposited on high-duty fuel assemblies at subcooled nucleate boiling conditions and cause the reactor neutron flux and core axial power distribution to deviate from the predicted distribution. The purpose of the present work is to describe the fundamentals in CRUD formation, transport, and deposition, in order to provide a theoretical basis for evaluating and analysing any fuel operational problem due to CRUD deposits. A Lattice Boltzmann Method model is proposed for simulating thermal hydraulic and chemical conditions in the coolant and the formation process of the CRUD. Simulation results show that existence of CRUD in the nuclear reactors, not surprisingly, leads to an increase in the clad temperature. Presence of CRUD also affects the temperature, molecule and ion concentrations, and electrical potential distribution in the coolant. This effect is especially strong near the CRUD surface. In addition, the results imply that the CRUD formation rate increases approximately linearly with the zeta potential (surface charge density), and Fe<span class=\"etd-inline-math\"><sup>3</sup>+</span> ion concentration.","abstract_has_math":true,"creators":["Li, Zebo"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Nuclear, Plasma, Radiolgc Engr","degree_department":null,"school":null,"contributors":["Uddin, Rizwan"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-02-06T20:13:13Z","date_published":"2012-02-06T20:13:13Z","updated_at":"2026-07-22T22:25:27Z","subjects":["Chalk River Unidentified Deposits (CRUD)","CRUD Induced Power Shift (CIPS)","formation","deposition","lattice Boltzmann method (LBM)"],"languages":["en"],"rights":["Copyright 2011 Zebo Li"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/29727","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Uddin, Rizwan"]},{"key":"dc:creator","label":"Author","values":["Li, Zebo"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-02-06T20:13:13Z","2011-12"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Nuclear, Plasma, Radiolgc Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Chalk River Unidentified Deposits (CRUD)","CRUD Induced Power Shift (CIPS)","formation","deposition","lattice Boltzmann method (LBM)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2011 Zebo Li"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/29727"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The Axial Offset Anomaly (AOA) is a major impediment to increases in reactor fuel performance preventing PWRs from operating with even more efficient core designs than they are at present. It is a phenomenon where boron compounds such as lithium metaborate LiBO$_2$ and nickel-boroferrite Ni$_2$FeBO$_5$ (known as mineral bonaccordite) concentrate and precipitate during reactor operation in corrosion products deposited on high-duty fuel assemblies at subcooled nucleate boiling conditions and cause the reactor neutron flux and core axial power distribution to deviate from the predicted distribution. The purpose of the present work is to describe the fundamentals in CRUD formation, transport, and deposition, in order to provide a theoretical basis for evaluating and analysing any fuel operational problem due to CRUD deposits. A Lattice Boltzmann Method model is proposed for simulating thermal hydraulic and chemical conditions in the coolant and the formation process of the CRUD. Simulation results show that existence of CRUD in the nuclear reactors, not surprisingly, leads to an increase in the clad temperature. Presence of CRUD also affects the temperature, molecule and ion concentrations, and electrical potential distribution in the coolant. This effect is especially strong near the CRUD surface. In addition, the results imply that the CRUD formation rate increases approximately linearly with the zeta potential (surface charge density), and Fe$^3+$ ion concentration.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-12-08T16:39:08Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Thesis.tex: 165755 bytes, checksum: 6a6bc9c70837831090119fe63b83a672 (MD5) Li_Zebo.pdf: 27429499 bytes, checksum: 2c6cd4bb496f218dac2e286ee042eaa8 (MD5)","Made available in DSpace on 2012-02-06T20:13:13Z (GMT). No. of bitstreams: 3 Li_Zebo.pdf: 27558117 bytes, checksum: 26819306686a8d5418034d2322cd489d (MD5) license.txt: 4056 bytes, checksum: f7935f32179cb3978267f9fc9ae41abc (MD5) Thesis.tex: 165755 bytes, checksum: 6a6bc9c70837831090119fe63b83a672 (MD5)"]},{"key":"dc:title","label":"Title","values":["Simulation of the CRUD formation process using the Lattice Boltzmann Method"]}]}],"canonical_facts":{"dc:contributor":["Uddin, Rizwan"],"dc:creator":["Li, Zebo"],"dc:date":["2012-02-06T20:13:13Z","2011-12"],"dc:description":["The Axial Offset Anomaly (AOA) is a major impediment to increases in reactor fuel performance preventing PWRs from operating with even more efficient core designs than they are at present. It is a phenomenon where boron compounds such as lithium metaborate LiBO$_2$ and nickel-boroferrite Ni$_2$FeBO$_5$ (known as mineral bonaccordite) concentrate and precipitate during reactor operation in corrosion products deposited on high-duty fuel assemblies at subcooled nucleate boiling conditions and cause the reactor neutron flux and core axial power distribution to deviate from the predicted distribution. The purpose of the present work is to describe the fundamentals in CRUD formation, transport, and deposition, in order to provide a theoretical basis for evaluating and analysing any fuel operational problem due to CRUD deposits. A Lattice Boltzmann Method model is proposed for simulating thermal hydraulic and chemical conditions in the coolant and the formation process of the CRUD. Simulation results show that existence of CRUD in the nuclear reactors, not surprisingly, leads to an increase in the clad temperature. Presence of CRUD also affects the temperature, molecule and ion concentrations, and electrical potential distribution in the coolant. This effect is especially strong near the CRUD surface. In addition, the results imply that the CRUD formation rate increases approximately linearly with the zeta potential (surface charge density), and Fe$^3+$ ion concentration.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-12-08T16:39:08Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Thesis.tex: 165755 bytes, checksum: 6a6bc9c70837831090119fe63b83a672 (MD5) Li_Zebo.pdf: 27429499 bytes, checksum: 2c6cd4bb496f218dac2e286ee042eaa8 (MD5)","Made available in DSpace on 2012-02-06T20:13:13Z (GMT). No. of bitstreams: 3 Li_Zebo.pdf: 27558117 bytes, checksum: 26819306686a8d5418034d2322cd489d (MD5) license.txt: 4056 bytes, checksum: f7935f32179cb3978267f9fc9ae41abc (MD5) Thesis.tex: 165755 bytes, checksum: 6a6bc9c70837831090119fe63b83a672 (MD5)"],"dc:identifier":["http://hdl.handle.net/2142/29727"],"dc:language":["en"],"dc:rights":["Copyright 2011 Zebo Li"],"dc:subject":["Chalk River Unidentified Deposits (CRUD)","CRUD Induced Power Shift (CIPS)","formation","deposition","lattice Boltzmann method (LBM)"],"dc:title":["Simulation of the CRUD formation process using the Lattice Boltzmann Method"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Nuclear, Plasma, Radiolgc Engr"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:27Z"}