Radiological consequences of a depressurization accident combined with water ingress in an HTR module-200

Iniotakis, N.; Decken, C.B. von der

doi:10.1016/0029-5493(88)90174-4

Cited by 3 publications

(1 citation statement)

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“…These events are expected to yield scenarios in which the fuel elements are exposed to variable steam partial pressures (PH2O) and temperatures, depending on the nature of the event. Table 1 describes generic conditions that may be experienced during the varied accident conditions [1][2][3][4][5][6][7]. These conditions form the basis for the oxidation testing conditions discussed here-in.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Matrix Material in Helium with Varied Moisture Content

Gerczak

Contescu

Lee

et al. 2019

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Exploration of the oxidation behavior of matrix material from tristructural-isotropic (TRISO) coated particle fuel elements in moisture environments provides critical data needed to predict the material's response during off-normal accident scenarios. Near-representative, matrix-only samples were fabricated to facilitate oxidation testing in varied moisture concentrations. Oxidation testing was completed over a range of temperatures and oxidizing environments to obtain the relevant oxidation kinetics parameters and empirical oxidation rates necessary to better predict and understand matrix oxidation behavior at relevant conditions. The acquired oxidations rates were fit to established models for steam oxidation of nuclear graphite, and data were acquired following an established process. The data showed good agreement over conditions typical of the kinetic regime, and they showed a departure from the kinetic model fit at elevated temperatures and steam partial pressures in helium carrier gas. The departure was confirmed to be due to the experimental conditions being beyond the kinetic regime based on destructive analysis.

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