{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/95259"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/95259","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Analysis of reverse flow restriction device to prevent fuel dryout during loss of coolant and instability accidents of boiling water reactors","abstract":"This work introduces a new method to increase the safety of Boiling Water Reactors (BWRs) during the BWR instability and Loss of Coolant Accidents (LOCA). The method is based on a device called Reverse Flow Restriction Device (RFRD) and its purpose is to allow the flow in the forward direction, but prevent the flow in reverse direction which occurs in multiple accident scenarios. In this thesis, detailed TRACE/PARCS simulations have been used to investigate the effect of RFRD on the peak clad temperature during BWR instability and LOCA. The device is simulated in TRACE by using high friction coefficients for the reverse flow to ensure that only forward flow is allowed. The results demonstrate that by adding the RFRD device, flow reversal in fuel bundles could be substantially blocked and so the inlet flow reversal is thus prevented. The RFRD device also showed a modest impact on reducing the power oscillations. The use of RFRD device could prevent fuel dryout damage by preventing excessive high clad temperatures due to sustained dryout without timely rewetting. For LOCA, the device is capable of containing the coolant inside the core during the blowdown and when activating the emergency systems which keep the peak clad temperature at lower levels. Moreover, the RFRD achieved the reflood phase (when the saturation temperature of the clad is restored) earlier than without the RFRD. Sensitivity results demonstrated that for LOCA, high reverse flow friction coefficient is needed and hence the RFRD should be well-fitted to the lower tie plate to be able to sustain the high pressure caused by the large coolant flow during the blowdown phase of LOCA.","abstract_html":"This work introduces a new method to increase the safety of Boiling Water Reactors (BWRs) during the BWR instability and Loss of Coolant Accidents (LOCA). The method is based on a device called Reverse Flow Restriction Device (RFRD) and its purpose is to allow the flow in the forward direction, but prevent the flow in reverse direction which occurs in multiple accident scenarios. In this thesis, detailed TRACE/PARCS simulations have been used to investigate the effect of RFRD on the peak clad temperature during BWR instability and LOCA. The device is simulated in TRACE by using high friction coefficients for the reverse flow to ensure that only forward flow is allowed. The results demonstrate that by adding the RFRD device, flow reversal in fuel bundles could be substantially blocked and so the inlet flow reversal is thus prevented. The RFRD device also showed a modest impact on reducing the power oscillations. The use of RFRD device could prevent fuel dryout damage by preventing excessive high clad temperatures due to sustained dryout without timely rewetting. For LOCA, the device is capable of containing the coolant inside the core during the blowdown and when activating the emergency systems which keep the peak clad temperature at lower levels. Moreover, the RFRD achieved the reflood phase (when the saturation temperature of the clad is restored) earlier than without the RFRD. Sensitivity results demonstrated that for LOCA, high reverse flow friction coefficient is needed and hence the RFRD should be well-fitted to the lower tie plate to be able to sustain the high pressure caused by the large coolant flow during the blowdown phase of LOCA.","abstract_has_math":false,"creators":["Radaideh, Majdi Ibrahim Ahmad"],"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":["Kozlowski, Tomasz X","Brooks, Caleb"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-03-01T15:45:49Z","date_published":"2017-03-01T15:45:49Z","updated_at":"2026-07-22T22:26:35Z","subjects":["TRAC/RELAP Advanced Computational Engine (TRACE/PARCS)","Boiling Water Reactor (BWR) instability","Loss of Coolant Accident (LOCA)"],"languages":["en"],"rights":["© 2016 Majdi Ibrahim Ahmad Radaideh. All Rights Reserved"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/95259","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Kozlowski, Tomasz X","Brooks, Caleb"]},{"key":"dc:creator","label":"Author","values":["Radaideh, Majdi Ibrahim Ahmad"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-03-01T15:45:49Z","2016-09-07","2016-12"]},{"key":"dc:type","label":"Dc Type","values":["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":["TRAC/RELAP Advanced Computational Engine (TRACE/PARCS)","Boiling Water Reactor (BWR) instability","Loss of Coolant Accident (LOCA)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["© 2016 Majdi Ibrahim Ahmad Radaideh. All Rights Reserved"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/95259"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This work introduces a new method to increase the safety of Boiling Water Reactors (BWRs) during the BWR instability and Loss of Coolant Accidents (LOCA). The method is based on a device called Reverse Flow Restriction Device (RFRD) and its purpose is to allow the flow in the forward direction, but prevent the flow in reverse direction which occurs in multiple accident scenarios. In this thesis, detailed TRACE/PARCS simulations have been used to investigate the effect of RFRD on the peak clad temperature during BWR instability and LOCA. The device is simulated in TRACE by using high friction coefficients for the reverse flow to ensure that only forward flow is allowed. The results demonstrate that by adding the RFRD device, flow reversal in fuel bundles could be substantially blocked and so the inlet flow reversal is thus prevented. The RFRD device also showed a modest impact on reducing the power oscillations. The use of RFRD device could prevent fuel dryout damage by preventing excessive high clad temperatures due to sustained dryout without timely rewetting. For LOCA, the device is capable of containing the coolant inside the core during the blowdown and when activating the emergency systems which keep the peak clad temperature at lower levels. Moreover, the RFRD achieved the reflood phase (when the saturation temperature of the clad is restored) earlier than without the RFRD. Sensitivity results demonstrated that for LOCA, high reverse flow friction coefficient is needed and hence the RFRD should be well-fitted to the lower tie plate to be able to sustain the high pressure caused by the large coolant flow during the blowdown phase of LOCA.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-02-28 without embargo terms","The student, Majdi Radaideh, accepted the attached license on 2016-08-31 at 13:32.","The student, Majdi Radaideh, submitted this Thesis for approval on 2016-08-31 at 13:42.","This Thesis was approved for publication on 2016-09-07 at 16:16.","DSpace SAF Submission Ingestion Package generated from Vireo submission #10110 on 2017-02-28 at 14:45:12","Made available in DSpace on 2017-03-01T15:45:49Z (GMT). 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The method is based on a device called Reverse Flow Restriction Device (RFRD) and its purpose is to allow the flow in the forward direction, but prevent the flow in reverse direction which occurs in multiple accident scenarios. In this thesis, detailed TRACE/PARCS simulations have been used to investigate the effect of RFRD on the peak clad temperature during BWR instability and LOCA. The device is simulated in TRACE by using high friction coefficients for the reverse flow to ensure that only forward flow is allowed. The results demonstrate that by adding the RFRD device, flow reversal in fuel bundles could be substantially blocked and so the inlet flow reversal is thus prevented. The RFRD device also showed a modest impact on reducing the power oscillations. The use of RFRD device could prevent fuel dryout damage by preventing excessive high clad temperatures due to sustained dryout without timely rewetting. For LOCA, the device is capable of containing the coolant inside the core during the blowdown and when activating the emergency systems which keep the peak clad temperature at lower levels. Moreover, the RFRD achieved the reflood phase (when the saturation temperature of the clad is restored) earlier than without the RFRD. Sensitivity results demonstrated that for LOCA, high reverse flow friction coefficient is needed and hence the RFRD should be well-fitted to the lower tie plate to be able to sustain the high pressure caused by the large coolant flow during the blowdown phase of LOCA.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-02-28 without embargo terms","The student, Majdi Radaideh, accepted the attached license on 2016-08-31 at 13:32.","The student, Majdi Radaideh, submitted this Thesis for approval on 2016-08-31 at 13:42.","This Thesis was approved for publication on 2016-09-07 at 16:16.","DSpace SAF Submission Ingestion Package generated from Vireo submission #10110 on 2017-02-28 at 14:45:12","Made available in DSpace on 2017-03-01T15:45:49Z (GMT). No. of bitstreams: 2 RADAIDEH-THESIS-2016.pdf: 3803582 bytes, checksum: 7e16ed31588a0c0e4cd1347631632b8a (MD5) LICENSE.txt: 4211 bytes, checksum: c3115487f9bb1e8782083c8ebbefd863 (MD5) Previous issue date: 2016-09-07"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/95259"],"dc:language":["en"],"dc:rights":["© 2016 Majdi Ibrahim Ahmad Radaideh. All Rights Reserved"],"dc:subject":["TRAC/RELAP Advanced Computational Engine (TRACE/PARCS)","Boiling Water Reactor (BWR) instability","Loss of Coolant Accident (LOCA)"],"dc:title":["Analysis of reverse flow restriction device to prevent fuel dryout during loss of coolant and instability accidents of boiling water reactors"],"dc:type":["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":"2026-07-22T22:26:35Z"}