Characterization of a Diffusion Tube Hydrogen Detector in a Dynamic Sodium System

Roy, Prodyot; Rodgers, Douglas N.

doi:10.13182/nt71-a30989

Cited by 12 publications

(11 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Figs. 5 and 6, endothermic peaks were around 685 K. It is inferred that the endothermic peaks are chemical decomposition of NaH as shown in reaction formula (10), whose temperature is consistent with about 685 K from some previous works (10) (11) . NaH➝Na +1/2H 2 ( T>685 K)…”

Section: Na-naoh Reaction Experimentssupporting

confidence: 84%

“…Na, NaOH and Na 2 O as major chemical species were observed from XRD analysis except NaH. Combined with the DTA results, it is assumed that NaH will be decomposed around 685 K just after Na-NaOH reaction as shown in reaction formula (10), though both Na 2 O and NaH initially can be generated by Na-NaOH reaction as shown in reaction formula (11). Therefore, it is inferred that only Na 2 O will be identified as reaction product at higher temperature reaction zone caused by SWR.…”

Section: Xrd Analysismentioning

confidence: 83%

“…In thermal analysis, we should arrange appropriate heating rate against reaction phenomena. Otherwise, it is impossible to measure the reaction temperature when reaction rate is slow in 11 Table 3, heating rate is too high for the case of Na:NaOH=2:1 to measure the reaction temperature at 7 or 10 K/min. This indicates that reaction rate in case of Na:NaOH=2:1 is slower than that of Na:NaOH=4:1 as shown in the exothermic peaks at 10 K/min.…”

Section: Na-naoh Reaction Experimentsmentioning

confidence: 99%

See 2 more Smart Citations

Kinetic Study of Sodium-Water Surface Reaction by Differential Thermal Analysis

Kikuchi

Seino

Kurihara

et al. 2013

JPES

View full text Add to dashboard Cite

In a sodium-cooled fast reactor (SFR), if a heat transfer tube in the steam generator (SG) is failed, high pressurized water vapor blows into the liquid sodium and sodium-water reaction (SWR) takes place. SWR may cause damage to the neighboring heat transfer tubes by thermal and chemical effects. Therefore, it is important to clearly understand the SWR for safety assessment of the SG. From recent study, sodium (Na)-sodium hydroxide (NaOH) reaction as secondary surface reaction of the SWR phenomena in a SFR was identified by ab initio (first-principle) method. However, kinetics of this reaction is a still open question. Thus, it is important to obtain quantitative rate constant of sodium monoxide (Na 2 O) generation by Na-NaOH reaction because Na 2 O may accelerate the corrosive and erosive effects. Differential thermal analysis (DTA) provides us with the valuable information on the kinetic parameters, including activation energy, pre-exponential factor (frequency factor) and reaction rate constant. In this work, kinetic study of Na-NaOH reaction has been carried out by using DTA technique. Based on the measured reaction temperature, the first-order rate constant of Na 2 O generation was obtained by the application of the laws of chemical kinetics. From the estimated rate constant, it was found that Na 2 O generation should be considered during SWR. The results can be the basis for developing a chemical reaction model used in a multi-dimensional sodium-water reaction code, SERAPHIM, being developed by the Japan Atomic Energy Agency (JAEA) toward the safety assessment of the SG in a SFR.

show abstract

Section: Na-naoh Reaction Experimentssupporting

confidence: 84%

Section: Xrd Analysismentioning

confidence: 83%

Section: Na-naoh Reaction Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Kinetic Study of Sodium-Water Surface Reaction by Differential Thermal Analysis

Kikuchi

Seino

Kurihara

et al. 2013

JPES

View full text Add to dashboard Cite

show abstract

“…The d R obtained from the previous workc1) in which the P H , was not affected practically by other impurities was between 0.1 and 0.4 kcal ; hence, an average value of 0.25 kcal was used to obtain the AH in Eq. ( 4 ) . T h e AH obtained from the slope of the P H~ us.…”

Section: Methodsmentioning

confidence: 99%

“…4 Estimated hydrogen partial pressure in sodium us. cold zone temperature concentration was plotted us.…”

Section: /Tcmentioning

confidence: 99%

Behaviors of impurities in liquid sodium. II. Effect of oxygen on behavior of hydrogen in liquid sodium.

Yoda

Yanagi

Sonoi

et al. 1979

J. Nucl. Sci. Technol.

View full text Add to dashboard Cite

T h e behavior of hydrogen in liquid sodium containing relatively large amounts of oxygen were investigated with the aid of the hydrogen sensor of niobium membrane. T h e partial pressure of the hydrogen in liquid sodium a t hot zone of a cold-trapped natural circulation sodium loop w a s measured a s functions of temperatures of the cold t r a p and the hot zone of the loop. It was observed that a t constant cold trap temperature the partial pressure of hydrogen in sodium increases with increasing the hot zone temperature. T h i s study also showed that, keeping the temperature of hot zone constant, a logarithmic plot of hydrogen concentration calculated from the equilibrium hydrogen partial pressure us. t h e reciprocal temperature of cold trap yields a straight line whose slope is nearly equal to that on the solubility of sodium hydroxide in sodium. Finally, it was observed that the permeation of hydrogen in sodium through a niobium membrane i s a process controlled by diffusion. But the permeability for hydrogen in niobium is a few-hundredths smaller than that in literature, owing to the oxide film on the membrane surface.

show abstract

The H-Na (Hydrogen-Sodium) system

San-Martin

Manchester

1990

Bulletin of Alloy Phase Diagrams

View full text Add to dashboard Cite

Characterization of a Diffusion Tube Hydrogen Detector in a Dynamic Sodium System

Cited by 12 publications

References 6 publications

Kinetic Study of Sodium-Water Surface Reaction by Differential Thermal Analysis

Kinetic Study of Sodium-Water Surface Reaction by Differential Thermal Analysis

Behaviors of impurities in liquid sodium. II. Effect of oxygen on behavior of hydrogen in liquid sodium.

The H-Na (Hydrogen-Sodium) system

Contact Info

Product

Resources

About