Oxygen Concentration Measurements During the Initial Stages of an HTGR Double-Ended Guillotine Break

Arcilesi, David J.; Ham, Tae Kyu; Sun, Xiaodong; Christensen, Richard N.; Oh, Chang Ho

doi:10.13182/t30742

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“…HTGRs are designed with multiple safety systems, but there is a probability of a break of the helium pressure boundary. Under such an event, the pressurized helium is discharged from the primary system into the confinement building cavity due to pressure difference [1,2]. Since the cavity region is initially filled with air before depressurizing the reactor's primary loop system, helium mixes with the air.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Flow Area in the Axial Cross-Vessel Annular Duct Following a Breach of the Primary Helium Boundary of an HTGR

Prieto,

Arcilesi

2023

20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-20)

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The lock-exchange flow phenomenon has been heavily studied for decades, including the lock-exchange phenomenon that takes place during an air ingress accident in a High-Temperature Gas-cooled Reactor (HTGR) during a break on the axial cross-vessel duct. The present study aims to characterize the gas dynamics in the cavity region of an HTGR, particularly the axial cross-vessel outer duct region. This study computes the velocity and flow area of the heavy and light currents when a break on the primary helium boundary occurs. This analysis is supported using experimental data from experiments conducted in a 1/20th length-scale HTGR. The following study summarizes the conditions of the experiment, the approach adopted to predict the flow area, and future work.

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Section: Introductionmentioning

confidence: 99%

“…When the pressure of the cavity section exceeds preset levels, the ventilation system is opened. This action results in the ventilation of the cavity section as gases are discharged through the ventilation system until the pressure drops to atmospheric levels [1,2,5,6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Flow Area in the Axial Cross-Vessel Annular Duct Following a Breach of the Primary Helium Boundary of an HTGR

Prieto,

Arcilesi

2023

20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-20)

View full text Add to dashboard Cite

show abstract

Oxygen Concentration Measurements During the Initial Stages of an HTGR Double-Ended Guillotine Break

Cited by 1 publication

References 0 publications

Analysis of Flow Area in the Axial Cross-Vessel Annular Duct Following a Breach of the Primary Helium Boundary of an HTGR

Analysis of Flow Area in the Axial Cross-Vessel Annular Duct Following a Breach of the Primary Helium Boundary of an HTGR

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