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High-Resolution Fluid Dynamic Experiments of Selected High-Temperature Gas-Cooled Reactor Accident Scenarios
High-Resolution Fluid Dynamic Experiments of Selected High-Temperature Gas-Cooled Reactor Accident Scenarios
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152953
- ISBN
- 9798384042082
- DDC
- 539.76
- 저자명
- Welker, Zachary.
- 서명/저자
- High-Resolution Fluid Dynamic Experiments of Selected High-Temperature Gas-Cooled Reactor Accident Scenarios
- 발행사항
- [Sl] : University of Michigan, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 189 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: A.
- 주기사항
- Advisor: Manera, Annalisa;Petrov, Victor.
- 학위논문주기
- Thesis (Ph.D.)--University of Michigan, 2024.
- 초록/해제
- 요약Two experimental Separate Effect Test (SET) facilities were designed and constructed to study the Pressurized Loss of Forced Cooling (PLOFC), Depressurized Loss of Forced Cooling (DLOFC), and Air Ingress accident scenarios for High-Temperature Gas-cooled Reactors (HTGRs). The facilities had the dual goals of physics discovery and generating a validation database for simulation codes that can be used for HTGR accident analysis. The first facility, the Helium Air Ingress gas Reactor Experiment (HAIRE), is a scaled SET based on the General Atomics GT-MHR. Experiments with HAIRE focused on small- and medium-sized air ingress scenarios, which have few experimental campaigns in comparison to less frequent, larger air ingress accidents. In addition to providing high-resolution validation data, HAIRE's data showed that the air ingress rate for smaller-sized breaks will be larger than previous theories would predict. HAIRE showed that the increase in exchange rate is due to a combined buoyant-diffusive flow. A modified correlation was made that combines previously understood unstable buoyant exchange theory and a new non-dimensional number. The new correlation well captures the exchange rate prediction seen from the experimental campaign. The new correlation considers the ratio between buoyant forces and diffusion forces for unstable buoyant flows, and the correlation converges to the previous theory in the case where diffusion effects are negligible. The second facility, the Refractive Indexed Matched PebbLe bEd (RIMPLE), is a scaled SET based on the HTR-PM. The RIMPLE takes a step forward in high-resolution pebble bed experiments, where 15,000 pebbles are present in a quarter-core experiment. The facility is designed to study the pebble bed to upper plenum transition regions during PLOFC and DLOFC accident scenarios. For high-resolution pebble bed experiments, the pebble bed must be 3D reconstructed to create a relevant model for comparison. The 3D reconstruction technique was evaluated for error sources and propagation so that experiments and simulations can be compared, and grounded with appropriate error consideration. This study is novel because it is the first to propagate the effects into positional uncertainty in the pebble bed reconstruction, rather than reporting as camera pixel uncertainty. HAIRE has generated a database for simulation tool validation, and RIMPLE is poised to do the same. These databases are invaluable for HTGRs simulation validation, and showing these tools can be confidently used for licensing of HTGRs for power generation. Additionally, HAIRE has provided insight into an infrequently studied flow condition of combined buoyant-diffusive flow where a possible new non-dimensional was utilized.
- 일반주제명
- Nuclear engineering
- 일반주제명
- Computer engineering
- 일반주제명
- Energy
- 일반주제명
- Sustainability
- 키워드
- Air ingress
- 기타저자
- University of Michigan Nuclear Engineering & Radiological Sciences
- 기본자료저록
- Dissertations Abstracts International. 86-03A.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152953
■006m o d
■007cr#unu||||||||
■020 ▼a9798384042082
■035 ▼a(MiAaPQ)AAI31631063
■035 ▼a(MiAaPQ)umichrackham005870
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a539.76
■1001 ▼aWelker, Zachary.
■24510▼aHigh-Resolution Fluid Dynamic Experiments of Selected High-Temperature Gas-Cooled Reactor Accident Scenarios
■260 ▼a[Sl]▼bUniversity of Michigan▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a189 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: A.
■500 ▼aAdvisor: Manera, Annalisa;Petrov, Victor.
■5021 ▼aThesis (Ph.D.)--University of Michigan, 2024.
■520 ▼aTwo experimental Separate Effect Test (SET) facilities were designed and constructed to study the Pressurized Loss of Forced Cooling (PLOFC), Depressurized Loss of Forced Cooling (DLOFC), and Air Ingress accident scenarios for High-Temperature Gas-cooled Reactors (HTGRs). The facilities had the dual goals of physics discovery and generating a validation database for simulation codes that can be used for HTGR accident analysis. The first facility, the Helium Air Ingress gas Reactor Experiment (HAIRE), is a scaled SET based on the General Atomics GT-MHR. Experiments with HAIRE focused on small- and medium-sized air ingress scenarios, which have few experimental campaigns in comparison to less frequent, larger air ingress accidents. In addition to providing high-resolution validation data, HAIRE's data showed that the air ingress rate for smaller-sized breaks will be larger than previous theories would predict. HAIRE showed that the increase in exchange rate is due to a combined buoyant-diffusive flow. A modified correlation was made that combines previously understood unstable buoyant exchange theory and a new non-dimensional number. The new correlation well captures the exchange rate prediction seen from the experimental campaign. The new correlation considers the ratio between buoyant forces and diffusion forces for unstable buoyant flows, and the correlation converges to the previous theory in the case where diffusion effects are negligible. The second facility, the Refractive Indexed Matched PebbLe bEd (RIMPLE), is a scaled SET based on the HTR-PM. The RIMPLE takes a step forward in high-resolution pebble bed experiments, where 15,000 pebbles are present in a quarter-core experiment. The facility is designed to study the pebble bed to upper plenum transition regions during PLOFC and DLOFC accident scenarios. For high-resolution pebble bed experiments, the pebble bed must be 3D reconstructed to create a relevant model for comparison. The 3D reconstruction technique was evaluated for error sources and propagation so that experiments and simulations can be compared, and grounded with appropriate error consideration. This study is novel because it is the first to propagate the effects into positional uncertainty in the pebble bed reconstruction, rather than reporting as camera pixel uncertainty. HAIRE has generated a database for simulation tool validation, and RIMPLE is poised to do the same. These databases are invaluable for HTGRs simulation validation, and showing these tools can be confidently used for licensing of HTGRs for power generation. Additionally, HAIRE has provided insight into an infrequently studied flow condition of combined buoyant-diffusive flow where a possible new non-dimensional was utilized.
■590 ▼aSchool code: 0127.
■650 4▼aNuclear engineering
■650 4▼aComputer engineering
■650 4▼aEnergy
■650 4▼aSustainability
■653 ▼aHigh temperature gas cooled reactors
■653 ▼aBuoyo-diffusive flow
■653 ▼aAir ingress
■690 ▼a0552
■690 ▼a0640
■690 ▼a0464
■690 ▼a0791
■71020▼aUniversity of Michigan▼bNuclear Engineering & Radiological Sciences.
■7730 ▼tDissertations Abstracts International▼g86-03A.
■790 ▼a0127
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164362▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
